Y/C Separation Using Adaptive Filtering for Cross-Color Elimination
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Solution Overview
Problem
Existing image processing methods for Y/C separation often result in blurred color boundaries due to narrow filtering bands or cross-color effects due to incorrect extraction of high-frequency luminance information as chrominance information, leading to deteriorated image displaying performance.
Innovation Solution
An image processing apparatus and method that includes a cross-color detecting module to identify pixels with cross-color effects and an image processing module performing adaptive filtering or amplification operations based on these conditions, selectively outputting chrominance values processed through different operations to maintain image sharpness and eliminate cross-color effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a narrow filtering band is used for Y/C separation, then the color boundary becomes sharper, but the chrominance information cannot be fully extracted resulting in blurred color boundaries
Solution Approach 1:
The patent applies dynamics by making the filtering band width adjustable rather than fixed. The system dynamically switches between a first filtering band width and a second filtering band width based on whether cross-color effect is detected in the image signal, allowing optimal extraction of chrominance information while maintaining color boundary sharpness
2Loss of information
If a wide filtering band is used for Y/C separation, then the chrominance information can be fully extracted, but high frequency luminance information is incorrectly identified as chrominance resulting in cross-color effect
Solution Approach 1:
The system dynamically adjusts the filtering band width based on cross-color effect detection. When cross-color effect is detected, the system switches to a narrower first filtering band width to eliminate the harmful effect. When no cross-color effect is present, it uses a wider second filtering band width to fully extract chrominance information
Solution Approach 2:
The patent implements feedback by detecting cross-color effect in the image signal and using this detection result to control the filtering band width selection. The detection unit continuously monitors the signal and provides feedback to the selective filtering unit, which adjusts the filtering parameters accordingly to eliminate cross-color effect
3Reliability
If adaptive filtering is applied to eliminate cross-color effect, then image quality improves, but device complexity increases
Solution Approach 1:
The patent segments the processing into distinct functional units: a detection unit for detecting cross-color effect, a selective filtering unit for applying different filtering operations, and control logic for switching between filtering modes. This segmentation allows the complex adaptive processing to be implemented through modular, manageable components
Data Source
AI summary
An image processing apparatus includes: a cross-color detecting module for detecting whether at least one pixel carried by a composite signal has cross-color effect; and an image processing module, coupled to the cross-color detecting module, for performing a first predetermined operation or a second predetermined operation on the composite signal to generate a corresponding chrominance signal; wherein when the pixel has cross-color effect, the image processing module outputs a chrominance value of the pixel from the chrominance signal processed through the first predetermined operation, and when the pixel does not have cross-color effect, the image processing module outputs the chrominance value from the chrominance signal processed through the second predetermined operation.