A method for accurate calibration of optical camera image surface

Abstract

The invention relates to an accurate calibration method for an image surface of an optical camera. The method is as follows: fix a calibration target with constant brightness in the center of the display screen; The formed image is a light spot; the camera is controlled by the gimbal to rotate according to the set angle step, and the light spot brightness data is collected and the corresponding camera pitch angle and azimuth angle data are recorded every time it is rotated, so as to obtain the effective field of view brightness surface of the camera; The surface is compensated and corrected to obtain the effective field of view brightness plane after the camera is calibrated. The invention solves the problem of precise calibration of the curved surface of the effective field of view image of the optical camera, the method is simple and low in cost, breaks through the technical bottleneck of the calibration of the curved surface of the effective field of view of the optical camera, and can complete the calibration of the optical plane used in large field of view engineering applications, and has application value high.

Description

technical field [0001] The invention belongs to the technical field of acquisition and correction of LED display screens, and relates to a method for accurately demarcating curved surfaces of images acquired by an optical camera. Background technique [0002] With the rapid development of the LED display field, the application requirements of the LED display screen are also emerging, and the display effect of the LED display screen has become one of the important factors restricting the development of the LED display field. Due to the discreteness and attenuation of light-emitting diodes, the LED display has the problem of uneven brightness display, which seriously affects the display effect. In order to overcome this problem, the point-by-point brightness correction technology of LED display screens emerged at the historic moment, and developed rapidly, which greatly improved the display quality. [0003] At present, the LED point-by-point correction technology that is mai...

AI Technical Summary

Problems solved by technology

However, the industrial camera or SLR camera used for calibration is not a standard luminance measurement instrument and has not been strictly calibrated. Therefore, during the image acquisition process, due to factors such as lens distortion and camera vignetting, there are serious curved surfaces in the acquired image. Phenomenon, which greatly affects the display effect after correction

[0004] In order to solve the above problems, although the uniform field calibration method mainly used at present can effectively correct the acquisition surface of the camera, the manufacturing of the uniform field is difficult and expensive, which is not conducive to engineering applications; while other methods cannot correct the surface well

Therefore, the camera acquisition surface becomes a difficult problem of acquisition correction

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