Image Enhancement via YCrCb Luminance and Chroma Compensation
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Solution Overview
Problem
LED displays used in both indoor and outdoor environments face issues with luminance adjustment, leading to offset colors and reduced display quality due to differences in external light environments, and conventional RGB to YCrCb conversion results in poor color display effects.
Innovation Solution
An image enhancement method involving luminance and chroma adjustment parameters, including luminance data scaling, adaptive luminance adjustment, and chroma data processing through hue rotation and saturation adjustment, followed by image color dimension conversion to improve display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If linear adjustment of RGB lamp bead current is used to adjust luminance, then luminance can be controlled, but color display accuracy deteriorates and colors become offset
Solution Approach 1:
The patent segments the luminance adjustment process into two distinct stages: first converting RGB image data to YCrCb color space to separate luminance (Y) from chroma (CrCb) components, then adjusting only the luminance component while preserving the chroma components. This segmentation allows independent control of brightness without affecting color accuracy, resolving the contradiction between luminance adjustment and color display precision.
2Illumination intensity
If RGB is converted to YCrCb to process luminance component, then luminance control is achieved, but color display effect deteriorates
Solution Approach 1:
The patent applies preliminary action by performing chroma compensation after luminance adjustment. The chroma compensation table is pre-calculated to counteract the color shifts that occur during luminance processing. By applying this pre-computed compensation, the system restores color accuracy after luminance adjustment, thereby maintaining both luminance control capability and color display quality.
3Adaptability or versatility
If one LED display is used for both indoor and outdoor environments, then device versatility is improved, but display quality deteriorates due to different light environments
Solution Approach 1:
The patent implements dynamic adaptation by adjusting luminance and chroma parameters based on detected ambient light conditions. The system dynamically modifies the Y and CrCb components according to whether the display is in indoor or outdoor environment, enabling the same LED display to maintain optimal display quality across different lighting conditions while preserving color accuracy through chroma compensation.
Data Source
AI summary
Disclosed is an image enhancement method, including: obtaining an image adjustment parameter; converting first image data to be processed into second image data; adjusting the luminance data to obtain adjusted luminance data, updating the luminance adjustment parameter when that the adjusted luminance data does not meet a preset luminance enhancement condition, and based on an updated luminance adjustment parameter, continuing to adjust the adjusted luminance data until final adjusted luminance data meets the luminance enhancement condition; adjusting the chroma data to obtain adjusted chroma data, updating the chroma adjustment parameter when that the adjusted chroma data does not meet a preset chroma enhancement condition, and based on an updated chroma adjustment parameter, continuing to adjust the adjusted chroma data until final adjusted chroma data meets the chroma enhancement condition; and performing image color dimension conversion on the luminance data and the chroma data to obtain third image data.