3D Comb Filtering for Video Signal Luma Chroma Separation
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Solution Overview
Problem
Conventional video processing methods for separating luma and chroma components in composite video signals often result in reduced bandwidth, leading to artifacts and inefficient signal separation, particularly due to the limitations of horizontal, vertical, and temporal combing techniques.
Innovation Solution
A 3D comb filtering method that generates interpolated pixels and determines the direction of least bandwidth to blend combing techniques, allowing for horizontal, vertical, and temporal combing to maximize output quality and minimize artifacts by adaptively applying these methods to reduce bandwidth losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional comb filtering methods (horizontal, vertical, or temporal) are used to separate luma and chroma components, then signal separation is achieved, but bandwidth is reduced leading to artifacts and quality loss
Solution Approach 1:
The patent divides the comb filtering process into three separate directional components (horizontal, vertical, and temporal) that can be independently analyzed and applied. By segmenting the filtering operation into distinct directional passes, each targeting specific bandwidth characteristics, the system achieves effective luma-chroma separation while preserving overall signal bandwidth through selective application of each directional filter based on local signal characteristics
Solution Approach 2:
The patent introduces a third dimension (temporal) to the traditional two-dimensional spatial comb filtering approach. By adding temporal comb filtering that operates across multiple video fields/frames in addition to horizontal and vertical spatial directions, the system creates a three-dimensional filtering space that more comprehensively separates luma and chroma components without sacrificing bandwidth in any single dimension
2Measurement precision
If bandwidth is reduced during comb filtering to separate luma and chroma, then separation is achieved, but artifacts are introduced in the video signal
Solution Approach 1:
The patent applies different comb filtering strategies to different regions of the video signal based on local characteristics. By analyzing local bandwidth requirements and artifact susceptibility in specific spatial and temporal regions, the system selectively applies horizontal, vertical, or temporal comb filtering only where appropriate, thereby achieving effective separation in regions that need it while avoiding artifact introduction in regions where it would be harmful
3Device complexity
If conventional comb filtering is applied to separate luma and chroma, then signal processing is simplified, but bandwidth losses occur in specific directions
Solution Approach 1:
The patent implements a dynamic comb filtering system that adaptively selects and adjusts the application of horizontal, vertical, and temporal filtering based on real-time analysis of the video signal characteristics. The system dynamically determines the optimal filtering direction and intensity for each local region and time point, allowing it to respond to changing bandwidth requirements and minimize directional bandwidth losses while maintaining processing efficiency through algorithmic optimization
Data Source
AI summary
Methods and systems for 3D comb filtering of a video signal are provided. Aspects of the method may include generating a plurality of interpolated pixels for corresponding video samples for a first video frame, determining at least one direction of least bandwidth among the video samples and the interpolated pixels, and blending combing according to the determined direction of least bandwidth. A plurality of interpolated pixels for corresponding video samples may be generated in a first pixel line of the first video frame. The plurality of interpolated pixels in the first pixel line may be generated, so that each of the plurality of interpolated pixels in the first pixel line is one quarter cycle phase-shifted from a corresponding adjacent pixel in the first pixel line.