An automatic calibration method for display screen

Abstract

The invention provides an automatic calibration method of a display screen. The method comprises the following steps of: correcting a camera; obtaining a background image of the display screen, and graying a white checkerboard image and a black checkerboard image to obtain a screen background gray scale image, a white checkerboard gray scale image and a black checkerboard gray scale image; respectively differencing the white checkerboard gray scale image and the black checkerboard gray scale image with the screen background gray scale image, taking absolute values and carrying out n times of mid-value smoothing filtration and Gaussian smoothing filtration; setting a gray scale threshold value of pixels, when the difference between pixel gray scale values corresponding to the two images obtained in above steps is greater than the set gray scale threshold value, setting the pixel value at a corresponding position as a corresponding difference value, and otherwise, setting the pixel value as zero; carrying out n times of mid-value smoothing filtration and Gaussian smoothing filtration on the newly generated images and then carrying out binarization; and carrying out profile feature extraction on the obtained binary images, detecting coordinate information of each image corner point through a profile sequence, and carrying out array correspondence according to the obtained coordinate information.

Description

technical field [0001] The invention belongs to the technical field of image processing, and in particular relates to an automatic calibration method for a display screen. Background technique [0002] The existing calibration of the display screen usually adopts a manual method, but because there is a certain viewing angle relationship between the installation position of the camera and the display screen area, the screen area captured by the camera needs to be calibrated to correspond to the touch area of ​​the screen. Affected by the distance between the camera and the display screen, the resolution of the camera, and the size of the display screen, etc., the accuracy of the touch points manually calibrated is low, and the number of touch points is large. The manual calibration process is not easy, which affects the user experience. . Contents of the invention [0003] The invention provides an automatic calibration method of a display screen, which completes the autom...

AI Technical Summary

Problems solved by technology

[0002] The existing calibration of the display screen usually adopts a manual method, but because there is a certain viewing angle relationship between the installation position of the camera and the display screen area, the screen area captured by the camera needs to be calibrated to correspond to the touch area of ​​the screen. Affected by the distance between the camera and the display screen, the resolution of the camera, and the size of the display screen, etc., the accuracy of the touch points manually calibrated is low, and the number of touch points is large. The manual calibration process is not easy, which affects the user experience.

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