Projector backlight adjustment method, device, equipment and medium

Abstract

The present invention relates to a method, device, equipment and medium for adjusting the backlight of a projector, comprising obtaining an original projection screen image projected by a projection lens of a camera configured on the projector, obtaining a captured projection screen image in a target coding format for each frame, wherein the projection ratio of the camera is smaller than the projection ratio of the projection lens; determining target field information satisfied by backlight values ​​of pixels in various directions in the captured projection screen image from preset light and dark field information according to the calculated variance of gray values ​​of pixels in the same orientation in multiple frames of captured projection screen images within a preset time length and a preset calibration variance; determining light and dark adjustment information of the original projection screen image according to the target field information; determining the frequency and duty cycle of a pulse width modulation signal used for backlight adjustment according to the light and dark adjustment information, and adjusting the backlight brightness of the original projection screen image corresponding to the projection lens through a backlight driving module according to the frequency and the duty cycle.

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