Knee Correction Device for Video Signal Hue Rotation
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Solution Overview
Problem
Conventional knee correction processing techniques in imaging devices fail to accurately reproduce the hue of high luminance components, leading to hue rotation and unnatural video output due to inappropriate level compression.
Innovation Solution
A knee correction device comprising a generator, detector, mixer, and supply module that generates a luminance signal from R, G, and B color signals, detects the maximum color signal, mixes it with the luminance signal at a specified ratio, and performs level compression using calculated coefficients to control chroma and luminance levels, preventing hue rotation and maintaining natural video output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If level compression processing is applied to high luminance components of video signals, then the level range of output video signal is set within standard, but the hue of high luminance components is not correctly reproduced and hue rotation occurs
Solution Approach 1:
The video signal processing is segmented into separate luminance (Y) and chrominance (C) components. The level compression is applied only to the luminance component while the chrominance component remains unchanged, preventing hue rotation while achieving standard compliance for luminance levels.
Solution Approach 2:
A luminance signal generator acts as an intermediary to create a dedicated luminance signal from the RGB color signals. This intermediary luminance signal is then used for level compression processing, separating the compression function from the color information to preserve hue accuracy.
2Manufacturing precision
If conventional level compression processing is applied to video signals, then the output level range meets standards, but the ratio of color signal levels is altered causing unnatural video output
Solution Approach 1:
The video signal is segmented into luminance and chrominance components, allowing independent processing. The level compression is applied exclusively to the luminance component, preserving the original chrominance signal and its level ratios, thus maintaining natural color relationships in the output video.
Solution Approach 2:
Different processing qualities are applied to different components: level compression is applied locally to the luminance component while the chrominance component maintains its original quality and level relationships, achieving standard compliance without compromising color fidelity.
Data Source
AI summary
According to one embodiment, a knee correction device includes a generator, a detector, a mixer, and a calculator. The generator generates a luminance signal from R, G, and B color signals. The detector detects a color signal having a maximum value among the R, G, and B color signals. The mixer mixes the luminance signal generated by the generator and the color signal detected by the detector, at a predetermined mixing ratio. The supply module supplies a coefficient for performing level compression on each of the R, G, and B color signals, based on an output of the mixer. The calculator performs level compression on the R, G, and B color signals by subjecting the coefficient supplied by the supply module and the R, G, and B color signals to a calculation.