Brightness compensation method and device
A technology of brightness compensation and compensation coefficient, applied in the field of brightness compensation methods and devices, can solve problems such as gray scale inversion, and achieve the effect of improving brightness compensation effect
Active Publication Date: 2021-03-09
GUANGDONG VTRON TECH CO LTD
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[0005] The present invention provides a brightness compensation method and device, which can solve the problem in the prior art that the gray scale inversion phenomenon occurs due to the opposite gradient of the 256 gray scale change gradient and the compensation gradient, as well as hardware calculation accuracy.
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[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0040] It is known from the background technology that the currently used brightness compensation method has a good compensation effect on the white screen, but when the output image is 256 gray scales, the 256 gray scale change gradient is opposite to the compensation gradient, and hardware calculation accuracy causes problems. The phenomenon of grayscale inversion, specifically displaying obvious contour lines on the screen, will reduce the user's viewing exp...
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The invention discloses a brightness compensation method and device, which sequentially compares two row pixels adjacent to the current row in image data to obtain the comparison result of each row pixel, and simultaneously records the number of continuous same row pixels; The current line in the image data is compared with the two columns of pixels in the same column of the adjacent previous line to obtain the comparison result of each column of pixels, and record the number of consecutive same column pixels; according to the number of consecutive same row pixels and column pixels Number, and the comparison result of each row pixel and column pixel adaptively adjusts the compensation coefficient, which solves the problem that the existing technology uses a fixed compensation coefficient for brightness compensation, resulting in gray-scale inversion of 256 gray-scale images, and further improves the Brightness compensation effect.
Description
technical field [0001] The invention relates to the technical field of image mosaic display, in particular to a brightness compensation method and device. Background technique [0002] In the field of image splicing display, rear-projection large-screen splicing is a large-screen display system composed of multiple small screens and multiple projectors. It is used to display one or more images on the large screen in the form of windows. Due to the existence of the cosine fourth power law in the projection display, the incident light parallel to the optical axis of the lens gathers in the center of the screen for imaging, assuming its illuminance is I0, and the oblique light that is not parallel to the optical axis enters at an arbitrary angle θ with the optical axis , the image surface illuminance at this time is Iθ, then there is a relational formula: Iθ=I0 cos4θ, that is, the brightness of oblique light imaging is proportional to the fourth power of the cosine of the obli...
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IPC IPC(8): G09G3/20
CPCG09G3/2074G09G2320/0233
Inventor 胡庆荣
Owner GUANGDONG VTRON TECH CO LTD