Image sensor and optical touch system with the image sensor
An image sensor and optical touch technology, applied to instruments, radiation control devices, and data processing input/output processes, can solve the problems of optical touch system processing load, memory space occupation, and power consumption. Achieve the effects of saving memory space, low system clock pulse, and saving power consumption
Inactive Publication Date: 2016-12-21
PIXART IMAGING INC
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Therefore, the optical touch system must always store the background image, which will occupy a considerable amount of memory space
In addition, the distribution of background light will also change, so the background image often needs to be updated, causing the processing load of the optical touch system
In addition, steps such as subtracting the image from the background image, analyzing the boundary position of the target image in the subtracted image, and calculating the target coordinates based on the boundary position require considerable computing time and consume considerable power.
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[0062] figure 1A schematic diagram of an image sensor 11 according to an embodiment of the present invention is shown. The image sensor 11 includes a plurality of photosensitive elements 111 arranged in a row direction 12 and a column direction 13 in multiple rows and columns. When the photosensitive element 111 receives light, it can generate an electronic signal. The image sensor 11 is constructed so that when the image sensor 11 captures a flat field image generated by a uniformly illuminated area, a part of the photosensitive elements 111 and another part of the photosensitive elements 111 will generate significantly different amounts of electrons. A difference in a significantly different number of electrons is one in which the difference in number is greater than the difference due to noise. Since there are two parts of the photosensitive element 111 that will generate significantly different numbers of electrons, the electronic signals captured by the plurality of pho...
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The invention discloses an image sensor and an optics touch and control system with the image sensor. The image sensor comprises a plurality of photosensitive elements which are arranged into a plurality of rows and a plurality of arrays. Among a flat field image produced by the image sensor, the luminance standard deviation of every pixel row is larger than the luminance standard deviation of every pixel array, or the luminance standard deviation of every pixel array is larger than the luminance standard deviation of every pixel row. According to the image sensor and the optics touch and control system with the image sensor, the luminance standard deviation of the image can be directly calculated, and target image can be found among the differences of distribution of the luminance standard deviation. No prestored background image is needed, so that storage space needed to store the background image can be saved, and captured image and the background image need not reducing, so that calculating steps are reduced. Due to the fact that the calculating steps are reduced, the optics touch and control system is enabled to utilize low system clock pulse, and consumption power energy needed to calculate target coordinate is saved.
Description
technical field [0001] The present invention relates to image sensing technology, and in particular to an image sensor and an optical touch system using the image sensor. Background technique [0002] In the optical touch system, the calculation method of the position of the target is to capture an image by the image sensor, analyze the position of the target image in the image, and then calculate according to the position of the target image and the partial geometric size of the optical touch system target coordinates. [0003] US Patent Publication No. 4,782,328 discloses an optical touch screen system. The optical touch screen system includes two sensors for capturing images of objects on the touch screen area. The processor is coupled to the two sensors, and determines the sensing paths respectively connecting the target and the two sensors by analyzing the images generated by the two sensors. The processor calculates the position coordinates of the target according t...
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IPC IPC(8): G06F3/042H01L27/146
Inventor 苏宗敏林志新高铭璨
Owner PIXART IMAGING INC