Adaptive Color Difference Transform for Non-Neutral White Points
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Solution Overview
Problem
Existing color difference transforms in digital video processing are not optimal for non-neutral white points, leading to inefficient compression and potential distortion in video content with varying creative white points.
Innovation Solution
A robust color difference transform technique that adapts to the dominant white point of video signals, using specific matrix equations and coefficients to optimize low-entropy output and maintain the artistically intended white point during encoding and decoding processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a standard color difference transform (e.g., Rec. 709) is used for video encoding, then the encoding process is simple and consistent, but compression efficiency deteriorates and distortion increases when the video content has a non-neutral creative white point
Solution Approach 1:
The patent implements a dynamic color difference transform that adapts to the creative white point of the video content. Instead of using a fixed transform matrix, the system dynamically determines the dominant white point from the video frames and adjusts the transform coefficients accordingly. This allows the encoding process to optimize for each specific content's white point characteristics, improving compression efficiency while maintaining manageable complexity through automated adaptation.
Solution Approach 2:
The patent changes the parameters of the color difference transform based on the detected creative white point. By modifying the transform matrix coefficients according to the dominant white point characteristics, the system optimizes the transformation to better represent the specific color characteristics of the video content, thereby improving compression efficiency without requiring a completely different encoding approach.
2Stability of the object's composition
If a standard color difference transform is used for video encoding, then the encoding process is consistent, but color accuracy and visual quality deteriorate for content with non-neutral white points
Solution Approach 1:
The system dynamically adapts the color difference transform to match the creative white point of each video segment. By determining the dominant white point from the content and adjusting the transform accordingly, the system maintains color accuracy for diverse white point conditions while preserving encoding consistency through a systematic adaptation process.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system analyzes the video content to determine the creative white point and uses this information to adjust the color difference transform parameters. This feedback loop ensures that the encoding process adapts to the actual content characteristics, maintaining both consistency in the encoding approach and accuracy in color representation.
3Loss of energy
If video content with non-neutral white points is encoded using standard transforms, then storage and transmission resources are wasted, but implementing adaptive transforms increases processing complexity
Solution Approach 1:
The adaptive color difference transform system performs self-adjustment by automatically determining the creative white point from the video content and configuring the transform parameters accordingly. This self-service capability eliminates the need for manual configuration or complex external processing, achieving improved storage efficiency while keeping processing complexity manageable through automated adaptation.
Solution Approach 2:
The system performs preliminary analysis to determine the dominant white point before applying the color difference transform. By preparing the transform parameters in advance based on content analysis, the system optimizes storage efficiency from the outset without requiring complex real-time adjustments during encoding, thereby managing processing complexity effectively.
Data Source
AI summary
Efficient image compression for video data characterized by a non-neutral dominant white point is achieved by transforming the input video signal into a de-correlated video signal based on a color difference encoding transform, wherein the color difference encoding transform is adapted based on the dominant white point using an algorithm. The adapting algorithm is designed for optimizing low-entropy output when the white point is other than a neutral or equal-energy value. Decompression is handled conversely.