A method for judging the shape and position of handwriting in an image interaction module

Abstract

The invention provides a method for judging the shape and the position of the handwriting of an image interaction module. The method includes the steps of firstly, storing a background image existing before writing is conducted; secondly, subtracting the background image existing before writing is conducted from an image existing after writing is conducted to obtain a difference image; thirdly, comparing all pixel points of the difference image with a preset gray level threshold value T one by one to obtain pixel sets of light spots in the difference image; fourthly, judging efficient points of each pixel set of the light spots to eliminate interference points and obtain all the effective light spots; fifthly, calculating the positions, with the highest luminance, of all the effective light spots. According to the method, effective collection of the writing background image and the light spots of an electronic stylus are effectively judged, external interference points of environment light rays are eliminated, the problem of writing pen jumping which appears when existing effective points are not accurately captured and the environment light rays are complex is solved, and therefore a better writing effect is achieved.

Description

technical field [0001] The invention relates to a method for judging the shape and position of handwriting of an image interaction module. Background technique [0002] At present, the principle of the image-like human-computer interaction module is to use the lens to capture the spot coordinates of the photoelectric pen (emitting infrared light), and then map the pixel coordinates to the PC program to obtain the display coordinates to achieve the writing effect. The most critical technology in the whole process is the spot coordinates. Capture, the current technology for capturing light spots in the industry is to simply set a brightness threshold, and then select a pixel brightness value in the screen to compare with the threshold value. Next coordinates, then each pixel is compared, and the boundary position of the spot is updated, so that the entire spot is surrounded by a rectangle, assuming that the spot is a circle, then the spot is the inscribed circle of the rectang...

AI Technical Summary

Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a method for judging the shape and position of the handwriting of the image interaction module, through the effective collection of the writing background picture and the effective judgment of the light spot of the photoelectric pen, and at the same time eliminating the interference points caused by the change of the ambient light, solving the problem in the past The effective point capture is not accurate enough, and the writing jump problem occurs when the ambient light is complex, so as to achieve better writing effect

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