CN101299795A - Image scanning device capable of positioning scanning starting position and related method thereof - Google Patents

Abstract

The invention discloses an image scanning device, which comprises a shell; the light-transmitting platform is arranged on the shell and used for placing a document to be scanned; the correcting mark is formed on one side of the light-transmitting platform and comprises an arc line, and a first point and a second point are arranged on the arc line; the optical machine is arranged in the shell and used for moving in a first direction so as to scan the file to be scanned and the correction mark; and the control module is arranged in the shell and used for controlling the optical machine to move to a scanning initial position according to the curvature radiuses of the first point, the second point and the arc line of the correction mark scanned by the optical machine.

Description

Image scanning device capable of positioning scanning start position and related method

technical field

The present invention provides an image scanning device capable of locating the scanning start position and its related method, especially an image scanning device and its related method for locating the scanning starting position by detecting an arc correction mark .

Background technique

An image scanning device (such as a scanner) is a very common computer peripheral product that can be used to scan actual flat documents and generate corresponding data. The scanner can also be used to convert images or media such as photos The data becomes a digital format data that can be modified by actual operation on a computer. In addition, it can also provide some additional functions, such as the scanner can fax the image data to other fax devices through the telephone line, or connect to a network to send the image data to other people in the form of e-mail, Or it can achieve the function of photocopying by connecting to a printer, and the converted digital data can be placed on the Internet for multiple people to use.

Please refer to FIG. 1 and FIG. 2 , FIG. 1 is a schematic diagram of the appearance of a scanner 10 in the prior art, and FIG. 2 is a schematic functional block diagram of the scanner 10 in the prior art. The scanner 10 includes an organic casing 12 , a transparent platform 14 , an optical engine 16 , a motor 18 , and a control module 20 . The light-transmitting platform 14 is arranged on the casing 12 for placing documents 22. The motor 18 is electrically connected to the control module 20 and connected to the optical machine 16. The control module 20 can control the motor 18 to drive the optical machine 16 to move back and forth in a first direction. In this stepping manner, the optical machine 16 is driven back and forth to scan the document 22 to generate an image signal corresponding to the document 22, and the motor 18 can be a stepping motor, or can be replaced by a servo motor, a DC motor, and the like.

After the optical machine 16 completes the action of scanning the document 22, it must first return to the home position (homeposition), and before the next scan, the optical machine 16 must be able to move from the home position to the scanning start position ( scan start position), by precisely positioning the scanning start position of the optical machine 16, it is possible to avoid the situation that part of the document image is not scanned by the optical machine 16 or the optical machine 16 scans a part that does not belong to the document image, This improves the quality of document scanning. However, the common practice in the prior art is to pre-set the reference pattern and the relative position of the reference pattern and the scanning start position before the scanner 10 leaves the factory. When the optical machine 16 scans the reference pattern, the control The module 20 can control the motor 18 to drive the optical machine 16 to travel a certain number of steps to reach the scanning start position, and then perform the subsequent action of scanning the document 22 . For example, in U.S. Patent No. 5,144,455, the main disclosure is to use a "black square" as a reference pattern, and move to the scanning direction of the document step by step through the optical machine until the line of the black square is scanned, and The scan start position can be defined, but the disadvantage of this method is that it takes too long to detect the scan start position. When black square, then must spend the time that motor 18 drives optical machine 16 to advance 47 steps and just can locate this scan start position, so the technology of this U.S. case is not the efficient way of locating this scan start position. In addition, in China Taiwan Patent Publication No. 462179, it is mainly disclosed that the "isosceles right triangle" is used as a reference pattern, and the strands (the two sides of the 90-degree angle) and the hypotenuse of these waist right triangles are scanned by optical machine The starting position of the scan can only be determined by the distance between the two coordinate points on the screen. However, this design also has its disadvantages: if the reference pattern of an isosceles right triangle is printed on the inside of the casing or installed with an isosceles right angle Manufacturing tolerances occur in the calibration sheet of the triangle reference pattern, which will cause the setting of the isosceles right triangle to be skewed. Therefore, under this condition, the optical machine scans the strand and the hypotenuse of the isosceles right triangle. The distance between the two coordinate points will not be equal to the distance between the coordinate point on the stock and the starting position of the scan, so that the starting position of the scan cannot be accurately located. Therefore, how to find an efficient and accurate mechanism for locating the scanning start position is a problem that needs to be worked hard and solved as soon as possible for the design of the current image scanning device.

Contents of the invention

The present invention provides an image scanning device for locating the scanning start position by detecting an arc calibration mark and its related method to solve the above problems.

The invention discloses an image scanning device, which includes an organic casing; a light-transmitting platform arranged on the casing, and the light-transmitting platform is used to place documents to be scanned; a calibration mark is formed on a part of the light-transmitting platform On the side, the calibration mark includes an arc on which a first point and a second point are arranged; an optical machine is installed in the casing, and the optical machine is used to move in a first direction, thereby scanning the to-be-scanned The aiming file and the calibration mark; and a control module installed in the casing, the control module is used to scan the first point and the second point of the calibration mark and the arc according to the optical machine The radius of curvature is used to control the optical machine to move to the scanning starting position.

The present invention also discloses a method for positioning the scanning start position of an image scanning device, which includes: (a) forming a calibration mark on one side of the light-transmitting platform of the image scanning device, wherein the calibration mark includes an arc on which a first point and a second point are set; (b) moving the optical machine of the image scanning device in a first direction, thereby scanning the first point and the second point of the calibration mark and (c) controlling the optical machine to move to the scanning start position according to the first point and the second point of the calibration mark scanned in step (b) and the radius of curvature of the arc.

Description of drawings

FIG. 1 is a schematic diagram of the appearance of a conventional scanner.

FIG. 2 is a functional block diagram of a prior art scanner.

FIG. 3 is a schematic diagram of the appearance of the image scanning device of the present invention.

FIG. 4 is a functional block diagram of the image scanning device of the present invention.

FIG. 5 is a flow chart of positioning the scanning start position of the image scanning device according to the first embodiment of the present invention.

FIG. 6 is a schematic diagram of the relative positions of the calibration mark on the calibration sheet of the present invention and the scanning start position of the image scanning device.

FIG. 7 is a schematic diagram of another calibration mark according to the second embodiment of the present invention.

FIG. 8 is a flow chart of positioning the scanning start position of the image scanning device according to the second embodiment of the present invention.

FIG. 9 is a schematic diagram of another calibration mark according to the third embodiment of the present invention.

FIG. 10 is a schematic diagram of another calibration mark according to the fourth embodiment of the present invention.

FIG. 11 is a schematic diagram of another calibration mark according to the fifth embodiment of the present invention.

FIG. 12 is a flow chart of positioning the scanning start position of the image scanning device according to the fifth embodiment of the present invention.

FIG. 13 is a schematic diagram of another calibration mark according to the sixth embodiment of the present invention.

Explanation of reference signs

10 Scanner 12 Chassis

14 Light-transmitting platform 16 Light machine

18 Motor 20 Control Module

22 files

50 Image scanning device 52 Chassis

54 Light-transmitting platform 56 Light machine

58 Motor 60 Control Module

62 Documents 64 Correction Sheets

66 Calibration mark 68 First scan line

70 Second scan line 72 Calibration mark

74 Third scan line 76 Calibration mark

78 Correction mark 80 Correction mark

80 1 ring 802 string

82 Fourth scan line 84 Calibration mark

841 Ring 842 String

843 Strings

P1 First point P2 Second point

P3 third point P4 fourth point

P5 fifth point P6 sixth point

P7 seventh point P8 eighth point

P9 Ninth point M1 Center position

M2 center position M3 center position

C1 Center of curvature C2 Center of curvature

C3 Center of curvature C4 Center of curvature

S Scan start position D1 First distance

D2 second distance D3 third distance

D4 fourth distance D5 fifth distance

D6 sixth distance D7 seventh distance

R1 radius of curvature R2 radius of curvature

R3 radius of curvature

Steps 100, 102, 104, 106, 108, 110, 112, 114, 116

Steps 202, 204, 206, 208

Steps 302, 304, 306, 308, 310, 312, 314

Detailed ways

Please refer to FIG. 3 and FIG. 4 , FIG. 3 is a schematic diagram of the appearance of the image scanning device 50 of the present invention, and FIG. 4 is a schematic functional block diagram of the image scanning device 50 of the present invention. The image scanning device 50 can be a scanner, which includes an organic casing 52 , a transparent platform 54 , an optical engine 56 , a motor 58 , and a control module 60 . The light-transmitting platform 54 is set on the casing 52, and is used to place the document 62 to be scanned. The motor 58 is electrically connected to the control module 60 and connected to the optical machine 56. The control module 60 can control the motor 58 to drive the optical machine 56 at ±X The direction moves back and forth, and the optical machine 56 is driven forward and backward to scan the document 62 in a stepping manner, so as to generate an image signal corresponding to the document 62, and the motor 58 can be a stepping motor, or can be replaced by a servo motor, a DC motor, etc. . The image scanning device 50 further includes a calibration sheet 64 (calibration sheet), installed between the inner side of the casing 52 and the light-transmitting platform 54 and located at one side of the light-transmitting platform 54 .

Please refer to FIG. 5. FIG. 5 is a flow chart of positioning the scanning start position of the image scanning device 50 according to the first embodiment of the present invention. The method of the present invention includes the following steps:

Step 100: Form the calibration mark 66 on the image scanning device 50. In addition to setting the calibration mark 66 directly, the calibration mark 66 can also be set through the calibration sheet 64. Please refer to FIG. 6, which shows the correction of the present invention. A schematic diagram of the relative position of the calibration mark 66 on the sheet 64 and the scanning start position S of the image scanning device 50 .

Step 102 : the control module 60 controls the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the first scanning line 68 and scans the first point P1 and the second point P2 of the calibration mark 66 .

Step 104: Calculate the first distance D1 between the first point P1 and the second point P2 in the Y direction perpendicular to the ±X direction.

Step 106 : Calculate the second distance D2 between the center position M1 of the first point P1 and the second point P2 in the Y direction and the center of curvature C1 of the calibration mark 66 .

Step 108 : the control module 60 controls the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the second scanning line 70 and scans the third point P3 and the fourth point P4 of the calibration mark 66 .

Step 110: Calculate a third distance D3 between the third point P3 and the fourth point P4 in the Y direction perpendicular to the ±X direction.

Step 112 : According to the difference between the first distance D1 and the third distance D3 , determine the relative position between the current position of the optical machine 56 and the center of curvature C1 of the calibration mark 66 .

Step 114: The control module 60 controls the motor 58 to drive the optical machine 56 to move to the scanning starting position S according to the judgment result of the step 112, the second distance D2, and the predetermined distance between the center of curvature C1 and the scanning starting position S.

Step 116: end.

Here, the above-mentioned steps are described in detail as follows. First, as shown in FIG. directly printed on the inner surface of the casing 52 . After the optical machine 56 completes the previous action of scanning documents, it must first return to the return position, and then the control module 60 will control the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the first scanning line 68. The selection of the range of the first scan line 68 can be rough, that is, as long as it falls within the range of the calibration mark 66, the optical machine 56 can sense the calibration mark 66 enough to scan the first scan line 68 The first point P1 and the second point P2 intersect with the edge of the calibration mark 66 . Next, since the coordinate values of the first point P1 and the second point P2 are known, the first distance D1 between the first point P1 and the second point P2 in the Y direction can be calculated, and it can also be calculated according to the Pitt's theorem The second distance D2 between the center position M1 of the first point P1 and the second point P2 in the Y direction and the center of curvature C1 (circle center) of the calibration mark 66:

Second distance D2=((radius of curvature R1 of correction mark 66) ² −(half of first distance D1) ² ) ^0.5

If the second distance D2 between the first scanning line 68 and the center of curvature C1 of the calibration mark 66 is calculated, the relative distance between the current position of the optical machine 56 and the center of curvature C1 of the calibration mark 66 can be known, but the optical The optical machine 56 is currently located above or below the center of curvature C1 of the calibration mark 66, unless the second distance D2 between the first scan line 68 and the center of curvature C1 of the calibration mark 66 is zero, it means that the optical machine 56 is currently located at the calibration mark 66 The relative position of the center of curvature C1. Then it is necessary to judge the relative orientation between the current position of the optical machine 56 and the center of curvature C1 of the calibration mark 66. The control module 60 can control the motor 58 to drive the optical machine 56 to move in the ±X direction, for example, in the +X direction, so that the optical machine 56 moves to the second scan line 70, the distance between the first scan line 68 and the second scan line 70 can be the interval of one scan line, that is, the first scan line 68 and the second scan line 70 are very close , and the optical machine 56 can scan out the third point P3 and the fourth point P4 at the intersection of the second scanning line 68 and the edge of the calibration mark 66. Since the coordinate values of the third point P3 and the fourth point P4 are known, it is easy to A third distance D3 in the Y direction between the third point P3 and the fourth point P4 can be calculated. If the control module 60 controls the motor 58 to drive the optical machine 56 to move in the +X direction, so that the optical machine 56 moves from the first scanning line 68 to the second scanning line 70, when it is judged that the third distance D3 is greater than the first distance D1 , it means that the first scanning line 68 and the second scanning line 70 are located above the center of curvature C1 of the calibration mark 66 , otherwise when it is judged that the third distance D3 is smaller than the first distance D1, it means that the first scanning line 68 The second scanning line 70 is located on the lower side of the center of curvature C1 of the calibration mark 66; in contrast, if the control module 60 controls the motor 58 to drive the optical machine 56 to move in the -X direction, so that the optical machine 56 is scanned by the first The line 68 moves to the second scanning line 70. When it is judged that the third distance D3 is greater than the first distance D1, it means that the first scanning line 68 and the second scanning line 70 are located below the center of curvature C1 of the calibration mark 66. , otherwise, when it is judged that the third distance D3 is smaller than the first distance D1, it means that the first scanning line 68 and the second scanning line 70 are located above the center of curvature C1 of the calibration mark 66 . As mentioned above, the relative distance between the current position of the optical machine 56 and the center of curvature C1 of the calibration mark 66 can be obtained by calculating the second distance D2, and the optical machine can be judged by comparing the first distance D1 and the third distance D3. 56 is currently located above or below the center of curvature C1 of the calibration mark 66 , so that the relative position of the current position of the optical machine 56 and the center of curvature C1 of the calibration mark 66 can be fully known.

Before the image scanning device 50 of the present invention leaves the factory, the predetermined distance between the center of curvature C1 of the calibration mark 66 and the scanning starting position S can be preset, that is, the control module 60 needs to control the motor 58 to drive the optical machine 56 to travel a certain number of steps. , the optical engine 56 can be moved from the center of curvature C1 of the calibration mark 66 to the scanning starting position S. Since the above-mentioned method has calculated the second distance D2 between the first scan line 68 and the center of curvature C1 of the calibration mark 66, and the first scan line 68 is very close to the second scan line 70, the first scan line The second distance D2 between the line 68 and the center of curvature C1 of the calibration mark 66 may be similar to the distance between the second scan line 70 and the center of curvature C1 of the calibration mark 66 , or the distance between the first scan line 68 and the second scan line 70 The spacing can be preset before the image scanning device 50 leaves the factory, so the second distance D2 between the first scanning line 68 and the center of curvature C1 of the calibration mark 66 and the first scanning line 68 and the second scanning line 70 The distance between the second scanning line 70 and the center of curvature C1 of the calibration mark 66 is derived. Finally, the control module 60 can control the motor 58 to drive the optical machine 56 to move to the scanning starting position S according to the judgment result of step 112, the second distance D2, and the predetermined distance between the center of curvature C1 and the scanning starting position S, and then Perform the next scan operation.

Please refer to FIG. 7. FIG. 7 is a schematic diagram of another calibration mark 72 in the second embodiment of the present invention. In the second embodiment, the calibration mark 72 is a solid semicircular pattern. Please refer to FIG. The flow chart of positioning the scanning start position of the image scanning device 50 in the second embodiment, the method of the present invention includes the following steps:

Step 202 : The control module 60 controls the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the third scanning line 74 and scans the fifth point P5 and the sixth point P6 of the calibration mark 72 .

Step 204 : Calculate the fourth distance D4 between the center position M2 of the fifth point P5 and the sixth point P6 in the Y direction and the center of curvature C2 of the calibration mark 72 .

Step 206 : The control module 60 controls the motor 58 to drive the optical machine 56 to move to the scanning starting position S according to the fourth distance D4 and the predetermined distance between the center of curvature C2 and the scanning starting position S.

Step 208: end.

The difference between the second embodiment and the first embodiment is that since the calibration mark 72 of the second embodiment is a solid semicircular pattern, it is only necessary to use the optical machine 56 to scan the calibration mark 72 once in the second embodiment. That is, the control module 60 controls the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the third scanning line 74 and scans the fifth point P5 and the sixth point of the calibration mark 72. Point P6. Similarly, since the coordinate values of the fifth point P5 and the sixth point P6 are known, the distance between the fifth point P5 and the sixth point P6 in the Y direction can be calculated, and the fifth The fourth distance D4 between the center position M2 of the point P1 and the sixth point P6 in the Y direction and the center of curvature C2 (circle center) of the calibration mark 72:

The fourth distance D4=((the radius of curvature R2 of the correction mark 72) ² -(half the distance between the fifth point P5 and the sixth point P6 in the Y direction) ² ) ^0.5

By calculating the fourth distance D4 between the third scanning line 74 and the center of curvature C2 of the calibration mark 72, the relative distance between the current position of the optical machine 56 and the center of curvature C2 of the calibration mark 72 can be known, and since the calibration mark 72 is solid semicircular pattern, so the chord lengths where the third scanning line 74 intersects with the calibration mark 72 at different positions are all different, and there is no need to judge the relative orientation between the current position of the optical machine and the calibration mark in the first embodiment, That is to say, the relative position between the current position of the optical machine 56 and the center of curvature C2 of the calibration mark 72 can be obtained through the calculation in step 204, and then the control module 60 can calculate according to the fourth distance D4, the center of curvature C2 and the scanning start position S The predetermined distance controls the motor 58 to drive the optical machine 56 to move to the scanning start position S, and then performs the next scanning operation. The principle of operation is the same as that of the first embodiment, so it will not be described in detail here.

Please refer to FIG. 9 and FIG. 10 , FIG. 9 is a schematic diagram of another calibration mark 76 according to the third embodiment of the present invention, and FIG. 10 is a schematic diagram of another calibration mark 78 according to the fourth embodiment of the present invention. In the third embodiment, the calibration mark 76 is a ring pattern, and its working principle is the same as that of the first embodiment, so it will not be described in detail here; and in the fourth embodiment, the calibration mark 78 is a semi-circle pattern, which The working principle is the same as that of the second embodiment, and will not be described in detail here.

Please refer to Fig. 11. Fig. 11 is a schematic diagram of another calibration mark 80 according to the fifth embodiment of the present invention. In the fifth embodiment, the calibration mark 80 is a combination of a ring 801 and a string 802, and the two ends of the string 802 are respectively connected. On the ring 801, and the chord line 802 can be the diameter passing through the center of curvature C3 of the ring 801, please refer to FIG. 12 , which is the process of positioning the scanning start position of the image scanning device 50 according to the fifth embodiment of the present invention. Figure, method of the present invention comprises the following steps:

Step 302: the control module 60 controls the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the fourth scanning line 82 and scans the seventh point P7 and the eighth point P8 of the calibration mark 80, With the ninth point P9.

Step 304 : Calculate the fifth distance D5 between the central position M3 of the seventh point P7 and the ninth point P9 in the Y direction and the center of curvature C3 of the ring 801 of the calibration mark 80 .

Step 306: Calculate the sixth distance D6 between the seventh point P7 and the eighth point P8 in the Y direction perpendicular to the ±X direction.

Step 308: Calculate the seventh distance D7 between the ninth point P9 and the eighth point P8 in the Y direction perpendicular to the ±X direction.

Step 310: Determine the relative position between the current position of the optical machine 56 and the center of curvature C3 of the ring 801 of the calibration mark 80 according to the difference between the sixth distance D6 and the seventh distance D7.

Step 312: The control module 60 controls the motor 58 to drive the optical machine 56 to move to the scanning starting position S according to the judgment result of the step 310, the fifth distance D5, and the predetermined distance between the center of curvature C3 and the scanning starting position S.

Step 314: end.

In the fifth embodiment, it is only necessary to use the optical machine 56 to scan the calibration mark 80 once, that is, the control module 60 controls the motor 58 to drive the optical machine 56 to move in the ±X direction, so that the optical machine 56 moves to the fourth Scan the line 82 and scan out the seventh point P7, the eighth point P8, and the ninth point P9 of the calibration mark 80, wherein the seventh point P7 and the ninth point P9 of the calibration mark 80 are the fourth scan line 82 and The edge intersection point of the circle 801 of the calibration mark 80 , and the eighth point P8 of the calibration mark 80 is the intersection point of the fourth scan line 82 and the chord line 802 of the calibration mark 80 . Similarly, since the coordinate values of the seventh point P7 and the ninth point P9 are known, the distance between the seventh point P7 and the ninth point P9 in the Y direction can be calculated, and the seventh The fifth distance D5 between the center position M3 of the point P7 and the ninth point P9 in the Y direction and the center of curvature C3 of the ring 801 of the calibration mark 80:

The fifth distance D5=((the radius of curvature R3 of the ring 801) ² -(half the distance between the seventh point P7 and the ninth point P9 in the Y direction) ² ) ^0.5

If the fifth distance D5 between the fourth scan line 82 and the center of curvature C3 of the ring 801 of the calibration mark 80 is calculated, the relative distance between the current position of the optical machine 56 and the center of curvature C3 of the ring 801 of the calibration mark 80 can be known. distance, but it is still impossible to know that the optical machine 56 is currently located above or below the center of curvature C3 of the ring 801 of the calibration mark 80, unless the fifth distance D5 between the fourth scanning line 82 and the center of curvature C3 is zero, which means that the light The machine 56 is currently positioned relative to the center of curvature C3 of the circular ring 801 of the calibration mark 80 . Then, it is necessary to judge the relative orientation between the current position of the optical machine 56 and the center of curvature C3 of the ring 801 of the calibration mark 80. Since the coordinate values of the seventh point P7 and the eighth point P8 are known, the seventh point can be calculated. The sixth distance D6 between P7 and the eighth point P8 in the Y direction, and knowing the coordinate values of the ninth point P9 and the eighth point P8, can calculate the sixth distance between the ninth point P9 and the eighth point P8 in the Y direction Seven distances from D7. When it is judged that the sixth distance D6 is greater than the seventh distance D7, it means that the fourth scan line 82 is located below the center of curvature C3 of the ring 801 of the calibration mark 80; otherwise, when it is judged that the sixth distance D6 is smaller than the seventh distance D7 , which means that the fourth scan line 82 is located above the center of curvature C3 of the ring 801 of the calibration mark 80 . As mentioned above, the relative distance between the current position of the optical machine 56 and the center of curvature C3 of the ring 801 of the calibration mark 80 can be obtained through the calculation of the fifth distance D5, and the comparison between the sixth distance D6 and the seventh distance D7 It can be judged that the optical machine 56 is currently located above or below the center of curvature C3 of the ring 801 of the calibration mark 80, so that the relative relationship between the current position of the optical machine 56 and the center of curvature C3 of the ring 801 of the calibration mark 80 can be completely known. Location. Next, the control module 60 can control the motor 58 to drive the optical machine 56 to move to the scanning starting position S according to the judgment result of step 310, the fifth distance D5, the predetermined distance between the center of curvature C3 and the scanning starting position S, Further, the next scanning action is performed, and its working principle is the same as that of the previous embodiment, so it will not be described in detail here.

Please refer to FIG. 13 . FIG. 13 is a schematic diagram of another calibration mark 84 in the sixth embodiment of the present invention. In the sixth embodiment, the calibration mark 84 is a combination of a ring 841 and two strings 842, 843. The two ends of 843 are respectively connected to the ring 841. Through this pattern design, when the fourth scanning line 82 is located outside the intersection of the ring 801 and the string 802 of the calibration mark 80 in the fifth embodiment (closer to The upper side and the lower side), the fourth scanning line 82 cannot intersect with the string line 802, resulting in the defect that the relative orientation judgment between the current position of the optical machine 56 and the center of curvature C3 of the ring 801 of the calibration mark 80 cannot be performed. That is, the combination of the circular ring 841 and the two strings 842, 843 in the sixth embodiment can ensure that the scanning line can intersect with one of the two strings 842, 843, so the current position and calibration of the optical machine 56 will not be missed. The operation of judging the relative orientation of the center of curvature C4 of the circle 841 marked 84 .

To sum up, the present invention mainly uses the detection of a calibration mark with an arc pattern to locate the scanning start position of the image scanning device, wherein the arc pattern can be a solid circular pattern, a solid semicircular pattern, Ring pattern, semi-circle pattern, combination of ring pattern and chord line, arc pattern, or various fan-shaped patterns, etc., and can be based on the intersection point of the scanning line and the edge of the calibration mark and the radius of curvature of the arc. Estimate the relative distance and orientation between the current position of the light machine and the center of curvature of the calibration mark, and then precisely position the light machine to the scanning start position for the next scanning action.

Compared with the prior art, the present invention locates the scan start position of the image scanning device by detecting a calibration mark with an arc pattern, and this mechanism can effectively reduce the motor speed during the process of positioning the scan start position. Drive the time and steps of the optical machine, and because the calibration mark of the circular pattern is a 360-degree symmetrical pattern, there will be no printing pattern on the inside of the case or manufacturing tolerance due to skew when installing the calibration sheet with the pattern Therefore, the present invention provides an efficient image scanning device and a related method capable of accurately locating the scanning start position.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the claims of the present invention shall fall within the scope of the patent of the present invention.

Claims (12)

1. can locate the image scanning apparatus that scans original position for one kind, it includes:

Casing;

The printing opacity platform is arranged on this casing, and this printing opacity platform is used for placing a file to be scanned;

Calibration marker is formed at a side of this printing opacity platform, and this calibration marker includes a camber line, which is provided with first with second point;

Ray machine is installed in this casing, and this ray machine is used for moving at first direction, scans this thus and waits to scan file and this calibration marker; And

Control module is installed in this casing, this control module be used for this first of this calibration marker of scanning according to this ray machine control this ray machine with this second radius of curvature and move to and scan original position with this camber line.

2. image scanning apparatus as claimed in claim 1, it comprises motor in addition, be used for driving this ray machine, wherein this control module can according to this first of this calibration marker that this ray machine scanned with this second draw this first with this second in first distance perpendicular to the second direction of this first direction, and control this ray machine according to this first distance and this radius of curvature of this camber line and move to this and scan original position.

3. image scanning apparatus as claimed in claim 2, wherein first of this of this calibration marker equals ((this radius of curvature) with this second second distance in the center of curvature of the center of this second direction and this camber line ²-(half of this first distance) ²) ^0.5

4. image scanning apparatus as claimed in claim 3, wherein be provided with in addition on this camber line of this calibration marker thirdly and the 4th point, this control module be used for this calibration marker of scanning according to this ray machine this first point, this second point, this thirdly, the 4th this first point of judging this calibration marker, this second point, this thirdly, the 4th relative position with this center of curvature, and control this ray machine of this motor driven according to this judged result and move to this and scan original position.

5. image scanning apparatus as claimed in claim 1, wherein this calibration marker includes a string of a musical instrument in addition, its two ends are connected to this camber line, this control module be used for this first of this camber line of scanning according to this ray machine with this second and this first and this second line and this string of a musical instrument intersected the 5th this first point of judging this calibration marker, this second point, the 5th relative position with this center of curvature in this second direction, and control this ray machine according to this judged result and move to this and scan original position.

6. image scanning apparatus as claimed in claim 1, it comprises correcting sheet in addition, is installed between this casing inboard and this printing opacity platform, and this calibration marker is arranged on this correcting sheet.

7. image scanning apparatus as claimed in claim 1, wherein the pattern of this calibration marker is selected from solid circles pattern, solid semicircle pattern, annulus pattern or semicircular ring pattern.

But 8. the method that scans original position of a positioning image scanning apparatus, it includes:

(a) side at the printing opacity platform of this image scanning apparatus forms calibration marker, and wherein this calibration marker includes a camber line, which is provided with first with second point;

(b) move the ray machine of this image scanning apparatus at first direction, scan thus this first of this calibration marker with this second point; And

(c) control this ray machine with this second radius of curvature and move to and scan original position for this first of this calibration marker that is scanned according to step (b) with this camber line.

9. method as claimed in claim 8, wherein step (c) comprise this first of this calibration marker of scanning according to step (b) with this second draw this first with this second in first distance perpendicular to the second direction of this first direction, and control this ray machine according to this first distance and this radius of curvature of this camber line and move to this and scan original position.

10. method as claimed in claim 9, wherein first of this of this calibration marker equals ((this radius of curvature) with this second second distance in the center of curvature of the center of this second direction and this camber line ²-(half of this first distance) ²) ^0.5

11. method as claimed in claim 10, its comprise in addition this ray machine scan this calibration marker this camber line thirdly with the 4th point, and step (c) comprise in addition this calibration marker that scans according to this ray machine this first point, this second point, this thirdly, the 4th this first point of judging this calibration marker, this second point, this thirdly, the 4th relative position with this center of curvature, and control this ray machine according to this judged result and move to this and scan original position.

12. method as claimed in claim 8, it comprises the 5th point that this ray machine scans a string of a musical instrument of this calibration marker in addition, the 5th be this first with this second joining at line and this string of a musical instrument of this second direction, and step (c) comprises the relative position of this first point that this first of this camber line of scanning according to this ray machine with and this string of a musical instrument the 5th judge this calibration marker, this second point, and this center of curvature at this second at the 5th, and controls this ray machine according to this judged result and move to this and scan original position.

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