JP2006003474A - Display control apparatus and image composition method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily synthesize an image of an arbitrary shape without using a plurality of video memories.
A display control device according to the present invention includes a storage unit that stores predetermined gradation data representing a predetermined image, and compares a plurality of gradation data with the predetermined gradation data, and includes a plurality of gradation data. A correction unit that corrects the same gradation data as the predetermined gradation data in the plurality of gradation data so that the gradation data is different from the predetermined gradation data. When the gradation data read from the storage unit is the same as the predetermined gradation data, the storage unit holds the already stored gradation data, and the gradation data read from the storage unit is the predetermined gradation data. Is not the same, the storage unit includes a control unit that controls the storage unit to store the gradation data output from the correction unit.
[Selection] Figure 2

Description

  The present invention relates to a display control device and an image composition method, and more particularly to a display control device and an image composition method for compositing images.

  A mobile phone generally includes a display device, and a liquid crystal display device is used as the display device.

  In addition, many mobile phones include a CCD (Charge Coupled Device) sensor. In recent years, a CCD sensor can capture not only a still image but also a moving image.

  FIG. 6 is a schematic block diagram showing a conventional mobile phone 200.

  The mobile phone 200 includes a liquid crystal controller 210 including a video memory 213, a main processor 221, a main memory 222, a CCD sensor 230 that captures an image, a liquid crystal display device 240, and a communication device 250 that communicates with other communication devices. And an input device 260 for inputting user instructions. The liquid crystal controller 210 controls the liquid crystal display device 240.

  The main processor 221 combines the gradation data representing the image in the main memory 222, and transfers the combined gradation data to the liquid crystal controller 210. In the mobile phone 200, when the liquid crystal display device 240 has a low resolution, grayscale data of one frame is transferred by one transfer.

  The liquid crystal controller 210 stores the gradation data transferred from the main processor 221 in the video memory 213. The gradation data stored in the video memory 213 is read at a constant cycle, and the gradation data is transferred to the liquid crystal display device 240. The liquid crystal display device 240 displays an image based on the gradation data.

  The CCD sensor 230 captures a still image and / or a moving image as an image, and generates gradation data representing the image. The gradation data generated in the CCD sensor 230 is temporarily input to the main processor 221, and the main processor 221 combines the gradation data in the main memory 222 and similarly transfers the combined gradation data to the liquid crystal controller 210. To do.

  In the mobile phone 200, image superimposition processing is performed in the main memory 222. By this image superimposition processing, a predetermined image for a user interface such as an image showing an antenna, an image showing a battery, or an image showing a clock can be combined with an image taken by the CCD sensor 230.

  In recent years, in the mobile phone 200, the resolution of the liquid crystal display device 240 has become higher and the power consumption of the liquid crystal controller 210 tends to increase with the resolution of the liquid crystal display device 240. As the resolution of the liquid crystal display device 240 is increased, it is desired to realize more complicated functions of the mobile phone 200 with lower power consumption.

  In recent years, with the increase in the number of pixels of the CCD sensor 230 and the ability to capture moving image images, functions for displaying moving images of 15 frames / second or more have been added. Many problems occur in terms of power consumption, EMI (electromagnetic interference) noise, and the performance of the main processor 221 for architectures such as image synthesis in the main memory 222 by the processor 221 and single frame display by batch transfer. ing.

  Therefore, it is desired that the image superimposition processing that has been performed in the main memory 222 by the main processor 221 so far be performed in the liquid crystal controller 210.

  The following two methods are known as a method for performing image overlay processing in the video memory 213.

  The first method is a method of superimposing images by dividing an area of a video memory built in the liquid crystal controller and setting an overlapping state of the divided areas from a microprocessor. This technique is described in Patent Document 1.

The second method is a method using OSD (On Screen Display) processing. In this technique, the controller includes a plurality of video memories that are used depending on the application. One video memory is used to store an image captured by the CCD sensor, and another video memory is a predetermined image such as a character. Used to remember.
JP-A-4-97288

  However, although the technique described in Patent Document 1 is effective when combining images of a specific rectangular area, it is not easy to combine images having an arbitrary shape.

  Further, the technique using OSD processing requires a plurality of video memories. As a result, the power consumption of the controller increases and the cost increases. In addition, it is difficult to add an additional video memory in a mobile phone that is required to be downsized.

  The display control apparatus according to the present invention is a storage unit capable of storing gradation data of one frame, a storage unit storing predetermined gradation data representing a predetermined image in the one frame, and a plurality of units representing images. A correction unit that receives at least one of the plurality of gradation data, outputs a plurality of gradation data including the corrected gradation data, and When the plurality of gradation data includes the same gradation data as the predetermined gradation data, the same gradation data as the predetermined gradation data in the plurality of gradation data is compared with the predetermined gradation data. The tone data is modified to be different from the predetermined gradation data, and the gradation data stored in the storage unit is read out, and the gradation data stored in the storage unit is read out from the predetermined level. Compared with key data and read from the storage If the output gradation data is the same as the predetermined gradation data, the storage unit holds the already stored gradation data, and the gradation data read from the storage unit is the predetermined gradation data. Is not the same, the storage unit includes a control unit that controls the storage unit to store the gradation data output from the correction unit.

  The correction unit includes a table unit having a table storing the predetermined gradation data, a comparison unit that compares the plurality of gradation data with the predetermined gradation data, and a comparison result of the comparison unit. A replacement unit that replaces the same gradation data as the predetermined gradation data in the plurality of gradation data with another gradation data may be included.

  The storage unit may include a video memory.

  The control unit may include a memory controller.

  The storage unit may store a plurality of predetermined gradation data representing the predetermined image in the one frame, and the table unit may include a plurality of tables storing the plurality of gradation data. .

  You may further provide the conversion part which converts the gradation data memorize | stored in the said memory | storage part.

  The conversion unit may include a palette table unit having a palette table for converting the gradation data stored in the storage unit.

  The correction unit may correct to gradation data indicating a gradation closest to the gradation indicated by the predetermined gradation data.

  In the image composition method of the present invention, the storage unit capable of storing gradation data of one frame stores the predetermined gradation data representing the predetermined image in the one frame, and the correction unit represents the image. Receiving a plurality of gradation data, correcting at least one of the plurality of gradation data, and outputting a plurality of gradation data including the corrected gradation data, wherein the correction unit includes the plurality of gradation data; Are compared with the predetermined gradation data, and when the same gradation data as the predetermined gradation data exists in the plurality of gradation data, the predetermined level in the plurality of gradation data is Correcting the same gradation data as the tone data so as to be different from the predetermined gradation data, reading out the gradation data stored in the storage unit, and reading the read gradation data into the predetermined gradation Compared with the key data, the storage unit When the read gradation data is the same as the predetermined gradation data, the storage unit holds the already stored gradation data, and the gradation data read from the storage unit is the predetermined gradation data. The storage unit includes a step of storing the gradation data output from the correction unit.

  According to the present invention, the correction unit corrects predetermined gradation data in a plurality of gradation data representing an image to another gradation data, and outputs a plurality of gradation data including the corrected gradation data. At the same time, the video memory holds the predetermined gradation data representing the predetermined image of the already stored gradation data as it is, and other than the predetermined gradation data of the gradation data stored in the video memory. Is updated to the gradation data output from the correction unit. As a result, a predetermined image previously stored in the video memory can be combined with another image.

  Further, according to the present invention, a predetermined image represented by a plurality of gradation data can be synthesized with another image.

  In addition, according to the present invention, by converting specific gradation data into different gradation data, an image to be synthesized can be set to an arbitrary gradation.

  According to the present invention, the correction unit compares the plurality of gradation data with the predetermined gradation data, and if there is the same gradation data as the predetermined gradation data in the plurality of gradation data, the plurality of gradation data The same gradation data in the data as the predetermined gradation data is modified so as to be different from the predetermined gradation data, and a plurality of gradation data including the modified gradation data is output. According to the present invention, when the gradation data read from the storage unit is the same as the predetermined gradation data, the storage unit holds the already stored gradation data, and the gradation read from the storage unit When the data is not the same as the predetermined gradation data, the storage unit stores the gradation data output from the correction unit.

  Therefore, the predetermined image represented by the predetermined gradation data can be overlaid with another image. In addition, it is possible to easily synthesize images of arbitrary shapes without using a plurality of video memories.

  In addition, according to the present invention, a comparison unit that compares a plurality of gradation data representing an image with predetermined gradation data, and a predetermined level of the plurality of gradation data according to a result of comparison in the comparison unit. A replacement unit that replaces the same gradation data as the gradation data with another gradation data, a video memory that stores gradation data, gradation data is read from the video memory, and the read gradation data is converted into predetermined gradation data. And a memory controller that controls the video memory so that the gradation data output from the replacement unit is stored in the video memory based on the comparison result.

  As a result, the replacement unit replaces predetermined gradation data in the plurality of gradation data representing the image with another gradation data, and the video memory has the predetermined gradation data already stored. The gradation data is held, and in other cases, the gradation data output from the replacement unit can be written. As a result, the video memory stores gradation data representing a predetermined image that has already been stored. It is possible to store and store other gradation data representing another image.

  In addition, according to the present invention, by comparing a plurality of gradation data representing an image with a plurality of predetermined gradation data in the table unit, a predetermined image represented by the plurality of gradation data is changed to another image. And can be synthesized.

  Further, according to the present invention, by having the palette table for converting the gradation data stored in the video memory, it becomes possible to convert specific gradation data into another gradation data, and an image to be synthesized can be converted. Arbitrary gradation can be achieved.

  In the following description, a display control device used for a mobile phone will be described as one embodiment of the display control device of the present invention.

  FIG. 1 is a schematic block diagram showing a mobile phone 100 using a display control device 10 according to an embodiment of the present invention.

  The mobile phone 100 includes a display control device 10 including a storage unit 13, a processing device 20, an imaging device 30 that captures an image, a display device 40 that displays an image, and a communication device 50 that communicates with other communication devices. And an input device 60 for inputting user instructions.

  The display control device 10 controls the display device 40.

  The processing device 20 functions as a system controller of the mobile phone 100, processes commands and instructions from the display control device 10, the communication device 50, and the input device 60, and sends them to the display control device 10, the communication device 50, and the input device 60. Give instructions and instructions.

  The storage unit 13 stores one frame of gradation data. Here, the gradation data of one frame includes gradation data of R (red), G (green), and B (blue) at each of a plurality of addresses of one frame. Value, G value, and B value.

  The processing device 20 transfers gradation data representing an image to the display control device 10.

  The imaging device 30 captures a still image and / or a moving image as an image, thereby generating gradation data representing the image. Next, the imaging device 30 transfers the generated plurality of gradation data to the display control device 10.

  The display control device 10 stores the gradation data transferred from the processing device 20 and / or the imaging device 30 in the storage unit 13. The gradation data stored in the storage unit 13 is read at a constant cycle and transferred to the display device 40.

  The display device 40 displays an image based on the gradation data output from the display control device 10.

  FIG. 2 is a schematic block diagram showing the configuration of the display control apparatus 10 shown in FIG. In FIG. 2, devices related to the display control device 10 are also shown.

  The display control apparatus 10 includes a correction unit 11 that corrects gradation data, a control unit 12, and a storage unit 13 that is also illustrated in FIG.

  The control unit 12 controls the storage unit 13 to store the gradation data in the storage unit 13 and read the gradation data from the storage unit 13.

  The display control apparatus 10 may further include a conversion unit 14 that converts gradation data read from the storage unit 13 by the control unit 12.

  When predetermined gradation data representing a predetermined image in one frame is stored in the processing device 20 in advance, the processing device 20 transfers the predetermined gradation data to the control unit 12, and the control unit 12 stores The unit 13 controls the storage unit 13 so as to store predetermined gradation data.

  Alternatively, the predetermined gradation data may be input to the processing device 20 after being imaged by the imaging device 30 and set by the processing device 20 in accordance with an input from the input device 60 (see FIG. 1).

  The processing device 20 transfers predetermined gradation data to the correction unit 11.

  The correction unit 11 receives a plurality of gradation data generated by the imaging device 30, corrects at least one of them, and outputs a plurality of gradation data including the corrected gradation data to the control unit 12.

  Specifically, first, the correction unit 11 receives a plurality of gradation data generated by the imaging device 30.

  Next, the correcting unit 11 corrects the gradation data generated by the imaging device 30 based on the gradation data generated by the imaging device 30 and the predetermined gradation data. More specifically, the correction unit 11 compares a plurality of gradation data generated by the imaging device 30 with predetermined gradation data, and, as a result of the comparison, the same as the predetermined gradation data in the plurality of gradation data. When there is gradation data, the same gradation data as the predetermined gradation data in the plurality of gradation data is corrected so as to be different from the predetermined gradation data. Note that the correction unit 11 preferably corrects the gradation indicated by the corrected gradation data so as to be as close as possible to the gradation indicated by the gradation data before correction.

  Next, the correction unit 11 outputs a plurality of gradation data including the corrected gradation data to the control unit 12.

  The processing device 20 also transfers predetermined gradation data to the control unit 12.

  The control unit 12 stores the gradation data stored in the storage unit 13 based on the gradation data stored in the storage unit 13, the predetermined gradation data, and the gradation data output from the correction unit 11. The storage unit 13 is controlled so as to be updated.

  Specifically, first, the control unit 12 reads the gradation data stored in the storage unit 13 for each address.

  Next, the control unit 12 compares the gradation data read from the storage unit 13 with predetermined gradation data. When the gradation data read from the storage unit 13 is the same as the predetermined gradation data, the storage unit 13 holds already stored gradation data. When the gradation data read from the storage unit 13 is not the same as the predetermined gradation data, the storage unit 13 stores the gradation data output from the correction unit 11 at the address.

  In this manner, the storage unit 13 can superimpose a predetermined image represented by predetermined gradation data with another image represented by different gradation data.

  The control unit 12 reads the gradation data from the storage unit 13 as necessary, and outputs the read gradation data to the conversion unit 14 as necessary.

  The conversion unit 14 converts preset gradation data among the gradation data output from the control unit 12.

  The processing device 20 changes the conversion of the conversion unit 14 as necessary.

  The conversion unit 14 outputs the converted gradation data to the display device 40.

  The display device 40 displays an image based on the gradation data output from the conversion unit 14.

  FIG. 3 is a schematic block diagram showing the configuration of the details of the display control apparatus 10 and the parts related to the display control apparatus 10 shown in FIG.

  The processing device 20 includes a microprocessor 21 and a main memory 22.

  The imaging device 30 includes a CCD sensor 31.

  The display device 40 includes a liquid crystal display device 41. The liquid crystal display device 41 includes a liquid crystal driving circuit and a liquid crystal panel, but detailed description thereof is omitted here.

  Here, the display control apparatus 10 controls the display apparatus 40, and here, the display control apparatus 10 functions as a liquid crystal controller.

  The correction unit 11 includes a comparison unit 11a, a replacement unit 11b that replaces the gradation data generated by the CCD sensor 31 based on the comparison result of the comparison unit 11a, and a table unit 11c having at least one table. Including.

  The control unit 12 includes a memory controller 12a.

  The storage unit 13 includes a video memory 13a.

  The conversion unit 14 includes a pallet table unit 14a having a pallet table.

  When the predetermined gradation data representing a predetermined image in one frame is stored in the main memory 22 in advance, the main processor 21 reads the predetermined gradation data from the main memory 22 and reads the predetermined gradation data read out. Is transferred to the memory controller 12a. The memory controller 12a controls the video memory 13a so that the video memory 13a stores predetermined gradation data.

  Alternatively, the predetermined gradation data may be input to the main memory 22 after being imaged by the CCD sensor 31 and set by the main processor 21 in accordance with an input from the input device 60 (see FIG. 1).

  In this way, the main memory 22 stores predetermined gradation data representing a predetermined image in one frame.

  The gradation data includes R (red), G (green), and B (blue) data. Here, the gradation data is represented by 6 bits, that is, 64 gradations, for each of R, G, and B.

  The microprocessor 21 controls the table unit 11c so that the table of the table unit 11c stores predetermined gradation data.

  Further, the microprocessor 21 controls the memory controller 12a so that the memory controller 12a stores the gradation data in the video memory 13a and reads the gradation data from the video memory 13a. Further, the microprocessor 21 controls the memory controller 12a so that the memory controller 12a outputs the gradation data obtained by reading the gradation data from the video memory 13a to the palette table unit 14a.

  The palette table unit 14 a converts the gradation data into preset gradation data using the palette table, and outputs the converted gradation data to the liquid crystal display device 41.

  The liquid crystal display device 41 displays an image based on the gradation data.

  Below, gradation data representing an image captured by the CCD sensor 31 is input, and the image captured by the CCD sensor 31 in the video memory 13a is combined with a predetermined image, and the liquid crystal display device 41 is combined. A mode of displaying is described.

  First, the CCD sensor 31 captures a moving image or a still image, thereby generating a plurality of gradation data representing the moving image or the still image.

  The gradation data generated by the CCD sensor 31 is input to the comparison unit 11a and the replacement unit 11b.

  The comparison unit 11a compares the gradation data with predetermined gradation data stored in advance in the table unit 11c. The comparison unit 11a outputs a signal indicating match / mismatch to the replacement unit 11b based on the comparison result.

  Specifically, when the gradation data generated by the CCD sensor 31 includes the same gradation data as the predetermined gradation data stored in the table section 11c, the comparison section 11a sends a signal indicating a match to the replacement section 11b. Output to. The comparison unit 11a outputs a signal indicating a mismatch to the replacement unit 11b when the gradation data generated by the CCD sensor 31 does not have the same gradation data as the predetermined gradation data stored in the table unit 11c. To do.

  When a signal indicating coincidence is input from the comparison unit 11a to the replacement unit 11b, for example, when the signal indicating coincidence becomes high level, the replacement unit 11b replaces the gradation data. Here, the replacement unit 11b inverts the least significant bit of the gradation data. This is because even if the least significant bit is inverted, the gradation change indicated by the gradation data is small.

  As described above, the replacement by the replacement unit 11b causes the gradation data output from the replacement unit 11b to be data that does not include any predetermined gradation data stored in the table unit 11c.

  The table of the table unit 11c is not limited to one, and may have a plurality of tables, and each of the plurality of tables may store different predetermined gradation data.

  When the table unit 11c includes a plurality of tables, the comparison unit 11a compares the gradation data with predetermined gradation data stored in advance in the table unit 11c.

  Also in this case, the replacement unit 11b inverts the least significant bit of the gradation data when a signal indicating coincidence is input from the comparison unit 11a. Next, the replacement unit 11b transmits the gradation data with the least significant bit inverted to the comparison unit 11a.

  The comparison unit 11a compares the gradation data with the least significant bit inverted with the gradation data stored in another table of the table unit 11c. As a result of comparison, when the gradation data with the least significant bit inverted is the same as the gradation data stored in another table of the table unit 11c, the comparison unit 11a sends a signal indicating a match to the replacement unit 11b. Output again.

  When a signal indicating the second coincidence is input to the replacement unit 11b, the replacement unit 11b replaces with another gradation data. Here, the replacement unit 11b inverts the second bit higher than the least significant bit of the gradation data.

  The comparison unit 11a and the replacement unit 11b repeat the comparison and inversion until the gradation data is different from all of the plurality of gradation data stored in the table unit 11c. Therefore, the gradation data output from the replacement unit 11b is different from all of the plurality of predetermined gradation data stored in the table unit 11c.

  As described above, even when the table unit 11c includes a plurality of tables, the gradation data output from the replacement unit 11b is data that does not include the predetermined gradation data stored in the table unit 11c.

  The memory controller 12a reads the gradation data already stored in the video memory 13a for each address, and compares the read gradation data with predetermined gradation data for each address.

  When the gradation data read from the video memory 13a is the same as the predetermined gradation data, the memory controller 12a controls the video memory 13a so that the video memory 13a holds the already stored gradation data. .

  When the gradation data read from the video memory 13a is not the same as the predetermined gradation data, the memory controller 12a causes the video memory 13a to store the gradation data output from the replacement unit 11b at the address. The video memory 13a is controlled.

  Further, even when a plurality of predetermined gradation data exists, the memory controller 12a compares the gradation data read from the video memory 13a with all the predetermined gradation data.

  If the read gradation data is the same as any one of the plurality of predetermined gradation data, the video memory 13a holds the already stored gradation data without writing to the address.

  On the contrary, when the gradation data read from the video memory 13a is different from all the predetermined gradation data, that is, when the read gradation data is not the same as any of the plurality of predetermined gradation data, the memory controller 12a controls the video memory 13a so that the video memory 13a stores the gradation data output from the replacement unit 11b at the address.

  The memory controller 12a reads the gradation data stored in the video memory 13a as necessary, and outputs the read gradation data to the palette table unit 14a.

  The palette table unit 14a converts preset gradation data among gradation data output from the memory controller 12a using the palette table. The palette table unit 14a uses a known method such as a memory table conversion method as a gradation conversion method using the palette table, but detailed description thereof is omitted here.

  The main processor 21 changes the table of the pallet table unit 14a as necessary. Thereby, the gradation of the image can be changed.

  The palette table unit 14 a outputs the converted gradation data to the liquid crystal display device 41.

  The liquid crystal display device 41 displays an image based on the gradation data output from the palette table unit 14a.

  Hereinafter, image composition will be described.

  FIG. 4 is a schematic diagram showing an image 70 of one frame including a predetermined image according to an embodiment of the present invention.

  In the image 70, the predetermined images are the outer frame 71, the first curved portion 72, the second curved portion 73, and the third curved portion 74, the first curved portion 72, and the second curved portion 74. A rainbow is formed by the curved portion 73 and the third curved portion 74.

  Here, for the purpose of preventing the description from becoming excessively complicated, R, G, and B of the gradation data are each represented by 2 bits, that is, 4 gradations.

  Here, FIG. 3 will be referred to again.

  The microprocessor 21 writes the outer frame 71 into the video memory 13a via the memory controller 12a. Here, the gradation data of the outer frame 71 is (R, G, B) = (10, 10, 10).

  Next, the microprocessor 21 connects the first curved portion 72, the second curved portion 73, and the third curved portion 74 to form a rainbow near the center of the frame via the Mori controller 12a. Write to video memory 13a. Here, the gradation data of the first curve portion 72 is (R, G, B) = (01, 00, 00), and the gradation data of the second curve portion 73 is (R, G, B). B) = (00,01,00), and the gradation data of the third curve portion 74 is (R, G, B) = (00,00,01).

  Further, the microprocessor 21 is set in advance so that the gradation data of the area for displaying the image picked up by the CCD sensor 31 is (R, G, B) = (00, 00, 00).

  Next, the microprocessor 21 stores four gradation data, that is, gradation data (R, G, B) = (10, 10, 10) of the outer frame 71 in the table section 11 c, and the first curve section 72. Gradation data (R, G, B) = (01, 00, 00), gradation data (R, G, B) of the second curve portion 73 = (00, 01, 00), third curve portion 74 gradation data (R, G, B) = (00, 00, 01) are stored.

  The gradation data generated by the CCD sensor 31 is corrected by the correction unit 11 into gradation data that does not include the four predetermined gradation data.

  Here, when gradation data representing images of a plurality of frames is continuously input from the CCD sensor 31, gradation data of the next frame is input from the CCD sensor 31, but already to the video memory 13a. Gradation data is stored. In this gradation data, the above-mentioned four predetermined gradation data are not stored in an area other than the predetermined image represented by the predetermined gradation data.

  Therefore, in the video memory 13, the predetermined image and the image captured by the CCD sensor 31 are combined.

  Note that the gradation data output from the memory controller 12a is converted by the palette table unit 14a using the palette table.

  Here, the gradation data (R, G, B) = (10, 10, 10) of the outer frame 71 is converted into blue gradation data (R, G, B) = (00, 00, 63). The gradation data (R, G, B) = (01, 00, 00) of the first curve portion 72 is converted into red gradation data (R, G, B) = (63, 00, 00). Then, the gradation data (R, G, B) = (00, 01, 00) of the second curve portion 73 is changed to green gradation data (R, G, B) = (00, 63, 00). The gradation data (R, G, B) = (00, 00, 01) of the third curve portion 74 is converted into yellow gradation data (R, G, B) = (63, 00, 63). Is converted to As a result, the image corresponding to the gradation data stored in the video memory 13a can have a desired gradation.

  Next, the palette table unit 14a outputs the converted gradation data to the liquid crystal display device 41, and the liquid crystal display device 41 displays an image based on the gradation data.

  FIG. 5 is a schematic diagram showing an image 70 of one frame obtained by combining another image with the predetermined image shown in FIG.

  As shown in FIG. 5, the image 75 is synthesized in a region other than the outer frame 71, the first curved portion 72, the second curved portion 73, and the third curved portion 74 in the image 70 of one frame. .

  As described above, according to the present embodiment, an image captured by the CCD sensor 31 is synthesized and displayed in real time while holding predetermined images such as an outer frame and a rainbow written in advance from the microprocessor 21. Can do.

  In the present specification, the predetermined image is not limited to a pattern and may be a character. In this case, it is also possible to synthesize a predetermined character on the video using the character as a predetermined image.

  In the above description, the display control apparatus according to the present invention is used for a mobile phone. However, the present invention is not limited to this. The present invention is applicable not only to a mobile phone but also to a mobile device such as a mobile information terminal.

  The display control device of the present invention can be applied not only to a portable device intended to be carried but also to a general display device, for example, a stationary television device.

  In the above description, the liquid crystal display device has been described as one form of the display device, but the display device applicable to the display control device of the present invention is not limited to the liquid crystal display device. The display control device of the present invention is applicable to any display device.

  As mentioned above, although this invention has been illustrated using preferable embodiment of this invention, this invention should not be limited and limited to this embodiment. It is understood that the scope of the present invention should be construed only by the claims. It is understood that those skilled in the art can implement an equivalent range based on the description of the present invention and the common general technical knowledge from the description of specific preferred embodiments of the present invention. Patents, patent applications, and documents cited herein should be incorporated by reference in their entirety, as if the contents themselves were specifically described herein. Understood.

  According to the present invention, when the gradation data read from the storage unit is the same as the predetermined gradation data, the storage unit holds the already stored gradation data, and the gradation data read from the storage unit If it is not the same as the predetermined gradation data, the storage unit stores the gradation data output from the correction unit, so that the predetermined image represented by the predetermined gradation data can be superimposed on another image. it can. Therefore, an image having an arbitrary shape can be easily synthesized without using a plurality of video memories.

FIG. 1 is a schematic block diagram showing a mobile phone using a display control apparatus according to an embodiment of the present invention. FIG. 2 is a schematic block diagram illustrating a configuration of the display control apparatus illustrated in FIG. FIG. 3 is a schematic block diagram showing a configuration of details of a portion related to the display control device shown in FIG. FIG. 4 is a schematic diagram showing an image of one frame including a predetermined image according to an embodiment of the present invention. FIG. 5 is a schematic diagram showing one frame obtained by synthesizing another image with the predetermined image shown in FIG. FIG. 6 is a schematic block diagram showing a conventional mobile phone.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Display control apparatus 11 Correction part 11a Comparison part 11b Replacement part 11c Table part 12 Control part 12a Memory controller 13 Storage part 13a Video memory 14 Conversion part 14a Palette table part 20 Processing apparatus 21 Microprocessor 22 Main memory 30 Imaging device 31 CCD sensor 40 display device 41 liquid crystal display device 50 communication device 60 input device 100 mobile phone

Claims (9)

A storage unit capable of storing gradation data of one frame, wherein the storage unit stores predetermined gradation data representing a predetermined image in the one frame;
A correction unit that receives a plurality of gradation data representing an image, corrects at least one of the plurality of gradation data, and outputs a plurality of gradation data including the corrected gradation data; When the gradation data is compared with the predetermined gradation data, and the gradation data is the same as the predetermined gradation data in the plurality of gradation data, the predetermined gradation in the plurality of gradation data A correction unit for correcting the same gradation data as the data so as to be different from the predetermined gradation data;
The gradation data stored in the storage unit is read out, the gradation data stored in the storage unit is compared with the predetermined gradation data, and the gradation data read out from the storage unit is the predetermined gradation data When the gradation data read from the storage unit is not the same as the predetermined gradation data, the storage unit stores the correction unit. And a control unit that controls the storage unit so as to store the gradation data output from the display control device. The correction unit is
A table unit having a table storing the predetermined gradation data;
A comparison unit for comparing the plurality of gradation data with the predetermined gradation data;
The replacement unit according to claim 1, further comprising: a replacement unit that replaces the same gradation data as the predetermined gradation data in the plurality of gradation data with another gradation data based on a comparison result of the comparison unit. Display control device.   The display control apparatus according to claim 1, wherein the storage unit includes a video memory.   The display control apparatus according to claim 1, wherein the control unit includes a memory controller. The storage unit stores a plurality of predetermined gradation data representing the predetermined image in the one frame,
The display control apparatus according to claim 2, wherein the table unit includes a plurality of tables storing the plurality of gradation data.   The display control apparatus according to claim 1, further comprising a conversion unit that converts the gradation data stored in the storage unit.   The display control apparatus according to claim 6, wherein the conversion unit includes a pallet table unit having a pallet table for converting the gradation data stored in the storage unit.   The display control device according to claim 1, wherein the correction unit corrects the gradation data to indicate a gradation closest to the gradation indicated by the predetermined gradation data. A storage unit capable of storing gradation data of one frame, storing predetermined gradation data representing a predetermined image in the one frame;
A correction unit that receives a plurality of gradation data representing an image, corrects at least one of the plurality of gradation data, and outputs a plurality of gradation data including the corrected gradation data; The correction unit compares the plurality of gradation data with the predetermined gradation data, and when the plurality of gradation data includes the same gradation data as the predetermined gradation data, the plurality of gradations Correcting the same gradation data as the predetermined gradation data in the data so as to be different from the predetermined gradation data;
The gradation data stored in the storage unit is read, the read gradation data is compared with the predetermined gradation data, and the gradation data read from the storage unit is the same as the predetermined gradation data. In this case, the storage unit holds already stored gradation data, and when the gradation data read from the storage unit is not the same as the predetermined gradation data, the storage unit is output from the correction unit. And a step of storing the gradation data.