CN1674042A - Contact screen information inputting positioning method based on image recognition - Google Patents

Abstract

The invention discloses a touch screen information input method of a computer. The touch screen information input positioning method based on image recognition is realized through the following steps, the control circuit sends work instructions to the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 at the same time, and is respectively fixed on the display screen 1 of the smart device 1 - 2 and 3 at the adjacent corners of 1 capture the image data of the touch object 4 that touches the surface of the display screen 1; the image data of 4 are sent to the image recognition and positioning calculation unit for confirmation and calculation, according to 4 to 2 and 3 The angle of incidence is converted into the two-dimensional coordinates of 4 on the display screen and then sent to the man-machine interface of 1 through the signal output unit; the method of the present invention does not require many optical image acquisition elements because only two CCD image acquisition devices are needed, so the structure It is simple and reliable, and can be widely used in occasions where optical image acquisition components can only be installed on one side of the display screen or on two sides parallel to each other.

Description

Touch screen information input positioning method based on image recognition

Technical field:

The invention relates to a computer touch screen information input method.

Background technique:

Touch screen is an important input device for human-computer interaction between people and multimedia computers. It has been widely used in fields such as flight inquiry machines and bank cash machines. At present, touch screens can be divided into four types in terms of working principles. They are resistive, infrared type, capacitive sensing and surface acoustic wave. Infrared touch screen is a device with high performance and wide application in current touch technology. The basic structure of infrared touch screen is in a frame around the edge of the display, along the four edges of the display surface of the display according to a certain Many infrared emitting tubes and receiving tubes are installed in sequence to form a mutually perpendicular transceiver array, so that the position of the finger or pointer on the touch screen can be detected. It has the following disadvantages: First, the use occasions are limited. Since it is necessary to form a mutually perpendicular infrared transmitting and receiving array, infrared transmitting and receiving tubes must be installed along the four edges of the display surface, so it cannot meet the special requirements that relevant transmitting and receiving equipment can only be installed on one side or on two sides parallel to each other; Second, the number of infrared emitting and receiving tubes used is large, and a large number of optical lenses are required, the structure is repeated, and the reliability of the work is low.

Invention content:

The object of the present invention is to provide a touch screen information input and positioning method based on image recognition, so as to overcome the defects of limited application occasions, repetitive structure and low working reliability in the prior art. The technical scheme of the present invention is realized by following steps, one, by the control circuit 6 of control sampling frequency, send work instruction to the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 simultaneously, by being respectively fixed on the smart device 1 The first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 at the adjacent corners of the display screen 1-1 pick up the image data of the touch object 4 touching the surface of the display screen 1; two, the image data of the touch object 4 Send it into the image recognition and positioning calculation unit 5 for confirmation and calculation, and convert the point of contact object 4 to the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 according to the angle of incidence of the touch object 4 on the display screen 1-1 for confirmation and calculation. 3. Send the two-dimensional coordinates of the touch object 4 on the display screen 1-1 to the man-machine interface of the smart device 1 through the signal output unit 7; repeat the above three steps in order to complete the human-machine interface. Information input to smart devices. The method of the present invention first collects the image data at the same moment from two CCD data acquisition units under the control of the control unit 6, then uses image recognition technology to recognize the central position of the image of the finger, pen tip, etc. for the collected image, Then calculate the two-dimensional coordinate positioning information of the touch object through the principle of human visual judgment distance and optical principle, and finally output the positioning information to the keyboard or mouse of electronic products such as PDA, mobile phone, tablet computer or computer through the signal output unit 7 Communication Interface. The touch screen information input positioning method based on image recognition in the present invention only needs two CCD image acquisition devices and does not need many optical image acquisition components, so the structure is simple and the operation is reliable, and it can be widely used in the The occasions where optical image acquisition components are installed on parallel sides, or for electronic products that cannot be installed with a large number of physical buttons because the display area is too small, can also be used in some environments such as hospitals and clean rooms that need to avoid dust collection. The invention has reasonable design, reliable operation and great popularization value.

Description of drawings:

FIG. 1 is a schematic diagram of the principle of collecting image information of a touch object 4 according to the present invention, and FIG. 2 is a schematic diagram of the signal flow of the present invention.

Detailed ways:

Specific Embodiment 1: The present embodiment will be specifically described below with reference to FIG. 1 and FIG. 2 . The present embodiment is realized by following steps, one, by the control circuit 6 of control sampling frequency, send work instruction to the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 simultaneously, through the display screen that is respectively fixed on smart device 1 The first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 at 1-1 adjacent corners pick up the image data of the touch object 4 touching the surface of the display screen 1; two, the image data of the touch object 4 is sent into The image recognition and positioning calculation unit 5 performs confirmation and calculation, and converts the two-dimensional coordinates of the touch object 4 on the display screen according to the incident angle of the touch object 4 to the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 3. The two-dimensional coordinates of the touch object 4 on the display screen are sent to the man-machine interface of the smart device 1 through the signal output unit 7; the signal output unit 7 is controlled by the control unit 6 to complete the synchronization with data acquisition; in order Repeat the above three steps to complete the information input of the person to the smart device. The first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 are all linear CCD (line array charge-coupled device) vision sensors, and the shape of the touch object 4 in step one sees through the first CCD data acquisition unit 2 and the camera lens 11 of the second CCD data acquisition unit 3 are imaged on the line array CCD photosensitive unit 12 of the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 respectively, because the first CCD data acquisition unit 2 and the second CCD The position and angle of the data acquisition unit 3 are fixed, and the relative position of the lens 11 and the line array CCD photosensitive unit 12 is fixed, so at a certain moment according to the touch object 4, the position of the first CCD data acquisition unit 2 and the second CCD data acquisition unit 3 is fixed. The incident angle can uniquely determine the two-dimensional coordinate position of the touch object 4 on the display screen at that moment. The lens 11 is a wide-angle lens.

Embodiment 2: The difference between this embodiment and Embodiment 1 is that the smart device 1 is a PDA (Personal Digital Assistant), a personal mobile phone, a notebook computer or a desktop computer. The electronic device used in the method of the present invention can be built into the smart device 1, and the corresponding functions can be completed by the program in the smart device 1, or the circuit device can be independently designed to complete the corresponding functions, or a dedicated large-scale logic can also be used. circuit to achieve the corresponding function.

Embodiment 3: The difference between this embodiment and Embodiment 1 is that the viewing angle of the lens 11 is 90-100 degrees. Camera lens 11 selects TOPGON type wide-angle objective lens for use.

Claims (4)

1, the touch screen information input positioning method based on image recognition, it is characterized in that it realizes by following steps, one, give the first CCD data acquisition unit (2) and the second CCD data simultaneously by the control circuit (6) of control sampling frequency The acquisition unit (3) sends out work instructions, through the first CCD data acquisition unit (2) and the second CCD data acquisition unit (3) respectively fixed at the adjacent corners of the display screen (1-1) of the smart device (1) Capture the image data of the touch object (4) that touches the surface of the display screen (1); 2. The image data of the touch object (4) is sent to the image recognition and positioning calculation unit (5) for confirmation and calculation. Object (4) to the first CCD data acquisition unit (2) and the incident angle conversion of the 2nd CCD data acquisition unit (3) to convert the two-dimensional coordinates of the touch object (4) on the display screen (1-1); 3. Send the two-dimensional coordinates of the touch object (4) on the display screen (1-1) to the man-machine interface of the smart device (1) through the signal output unit (7); repeat the above three steps in order to complete the human-machine interface. Information input to smart devices. 2. The image recognition-based touch screen information input positioning method according to claim 1, characterized in that the smart device (1) is a PDA, a personal mobile phone, a notebook computer or a desktop computer. 3. The image recognition-based touch screen information input positioning method according to claim 1, characterized in that the lenses (11) of the first CCD data acquisition unit (2) and the second CCD data acquisition unit (3) are wide-angle lenses. 4. The image recognition-based touch screen information input and positioning method according to claim 3, characterized in that the viewing angle of the lens (11) is 90-100 degrees.