Adaptive Pal Field Comber for Video Artifact Reduction
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Solution Overview
Problem
Existing analogue video decoders face challenges in accurately separating luma and chroma components, particularly in PAL video decoding, leading to field motion artifacts due to inadequate field combing based on spatially displaced phase subcarriers.
Innovation Solution
An adaptive video decoder that selectively employs 2D, frame, and field combing techniques based on chroma-luma determination, field motion, and vertical correlation status, using an adaptive comb controller to generate control signals for optimal combing operations, enabling adaptive comber configurations for different image regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If field combing is applied to improve luma/chroma separation, then image quality improves, but field motion artifacts are generated due to spatial displacement of phase subcarriers
Solution Approach 1:
The patent implements dynamic adaptation of combing parameters based on detected field motion levels. The system adjusts combing strength and phase subcarrier tap selection in real-time according to motion conditions, transitioning from static to dynamic operation to prevent artifacts while maintaining separation accuracy.
Solution Approach 2:
The patent applies different combing strategies to different spatial regions and motion conditions. By analyzing field motion locally and applying region-specific combing parameters, the system optimizes luma/chroma separation where needed while avoiding artifact generation in high-motion areas.
2Manufacturing precision
If 2D spatial filtering is applied to improve luma/chroma separation, then image quality improves, but processing complexity increases
Solution Approach 1:
The patent segments the combing process into distinct stages: motion detection, field motion analysis, CLD status determination, and adaptive parameter selection. This modular segmentation reduces processing complexity by breaking down the complex 2D filtering into manageable, independent modules that can be executed sequentially.
3Manufacturing precision
If adaptive combing with multiple techniques is implemented, then image quality and artifact reduction improve, but device complexity increases
Solution Approach 1:
The patent changes operational parameters (combing strength, phase subcarrier tap selection, combing mode) based on detected conditions rather than implementing entirely separate processing paths. This parameter-based adaptation reduces device complexity compared to implementing multiple independent combing systems.
Data Source
AI summary
A video decoder includes an adaptive comber to generate a combed video image, and the adaptive comber selectively combs using 2D combing, frame combing, and field combing.