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Optical touch system and target coordinate computing method thereof

A technology of touch control system and target, which is applied in calculation, instrumentation, electrical digital data processing, etc., and can solve problems such as coordinate calculation errors

Inactive Publication Date: 2013-01-02
PIXART IMAGING INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, users may use fingers or other soft objects to operate the optical touch screen system, and such objects are not easy to produce a fixed predetermined size, resulting in coordinate calculation errors

Method used

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  • Optical touch system and target coordinate computing method thereof
  • Optical touch system and target coordinate computing method thereof
  • Optical touch system and target coordinate computing method thereof

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Embodiment Construction

[0032] An embodiment of the present invention discloses a method for calculating target coordinates. When a target image generated by a target and a mirror image generated by a mirror image of the target form an overlapping image, the method for calculating target coordinates obtains an image generated by the target. A separate image is then used to calculate the coordinates of the object using the overlapping image and the separate image. When the target image overlaps with the mirror image generated by the target mirror image, there are many methods for obtaining a separate image, and these methods can all be used in the present invention. For example, change the lighting mode of the lighting system in the touch screen system so that no mirror image is generated when the image is captured; or isolate the light that generates the mirror image, and only allow the light that generates the target image to be projected on the image sensor; or It is to shorten the height of the mi...

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Abstract

The invention discloses an optical touch system and a target coordinate computing method thereof. The method includes: providing a mirror plane to generate a mirror image of a target; providing an image sensor to obtain a target image of the target and an image of the mirror image; when analysis shows that the target image and the mirror image form a superimposed image, obtaining an independent image generated by the target; and computing coordinates of the target according to the superimposed image and the independent image.

Description

technical field [0001] The present invention relates to the field of optical touch technology, and in particular to an optical touch system and a method for calculating target coordinates. Background technique [0002] A touchscreen device is a device that allows users to interact with applications directly on the screen. There are various types of touch screen devices, among which the optical touch screen is a common one. [0003] figure 1 A conventional optical touch screen system 1 is shown, which was invented in US Patent Publication No. 4,782,328. Such as figure 1 As shown, the optical touch screen system 1 includes two sensors 11 , and the two sensors 11 are used to capture images of objects 13 on the touch screen area 12 . The processor 14 is coupled to the two sensors 11 , and determines the sensing path 15 respectively connecting the target 13 and the two sensors 11 by analyzing the images generated by the two sensors 11 . The processor 14 then calculates the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/042
Inventor 苏宗敏陈信嘉林志新林卓毅
Owner PIXART IMAGING INC