Method and device for touch identification of optical imaging touch screen
A technology of optical imaging and recognition methods, applied in the input/output process of data processing, instruments, electrical digital data processing, etc., can solve problems such as misjudgment, and achieve the effect of avoiding misjudgment by touch
Active Publication Date: 2013-09-11
GUANGZHOU SHIRUI ELECTRONICS
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However, because there may be weak background light outside the endpoint of the reflective material, making the gray value not zero, it is not accurate to assume that there is no light beyond the endpoint of the reflective material. Obstacles or changes in light are identified as touch objects, resulting in misjudgment
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[0025] In order to further illustrate the technical means adopted by the present invention and the achieved effects, the technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings and preferred embodiments.
[0026] see Figure 4 , is a schematic flowchart of the touch recognition method for the optical imaging touch screen of the present invention. The touch recognition method of the optical imaging touch screen of the present invention comprises the following steps:
[0027] S101 acquires the light intensity signal waveform value corresponding to each pixel point collected by the camera;
[0028] S102 Search for the first pixel point in each pixel point according to the acquired waveform value of the light intensity signal; wherein, the first pixel point is the pixel point with the largest change rate of the waveform value of the light intensity signal, or starts from zero pixel point The first ...
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The invention discloses a method for touch identification of an optical imaging touch screen, which comprises the following steps: obtaining light intensity signal waveform values corresponding to all pixels and collected by a camera; searching the first pixel among all pixels according to the obtained light intensity signal waveform values, wherein the first pixel is a pixel which has the largest change rate of the light intensity signal waveform value, or a pixel, the light intensity signal waveform value of which is the first one to reach a preset value starting from the zero pixel; and identifying the first pixel as a boundary point of the valid range of the camera. In addition, the invention further discloses a touch identification device of the optical imaging touch screen. According to the invention, the pixel which has the largest change rate of the light intensity signal waveform value preset value, or the light intensity signal waveform value of which is the first one to reach the preset value starting from the zero pixel is taken as the upper boundary of the valid identification range of the camera, and the pixels outside the upper boundary are identified as the invalid range of the camera, so that an erroneous judgment of touch is avoided.
Description
technical field [0001] The invention relates to the technical field of optical imaging touch screens, in particular to a touch recognition method for an optical imaging touch screen and a touch recognition device for an optical imaging touch screen. Background technique [0002] The optical imaging touch screen is a touch screen that installs cameras (such as infrared cameras) on two corners of the screen, and calculates the position of the touch point through the position information of the touch object in the two cameras. The optical imaging touch screen has a camera in the left and right upper corners. If a touch object enters the touch area and blocks part of the light entering the camera, the camera can calculate the angle based on the pixel position of the blocked part, and then calculate the coordinates from the left and right angles. [0003] figure 1 It is an image captured by a camera, and the white bright strip area is the area where the reflective material is l...
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IPC IPC(8): G06F3/042
Inventor 黄斐铨
Owner GUANGZHOU SHIRUI ELECTRONICS