Color Space Conversion Circuit Processing LCEVC Residuals
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Solution Overview
Problem
Receivers in set-top boxes or televisions face difficulties in processing the enhancement layer residuals of the MPEG-5 Part 2 Low Complexity Enhancement Video Coding (LCEVC) standard, particularly with negative residual values, which complicates obtaining the original video data, and designing a new chip to address this issue is costly.
Innovation Solution
A receiver configuration that includes a decoder, an upscale circuit, and a color space conversion circuit, where the upscale circuit generates an upscaled base layer and enhancement layer residuals, and the color space conversion circuit uses a conversion matrix to combine these layers, effectively processing the video stream without the need for a new chip design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a new chip is designed to process LCEVC enhancement layer residuals with negative values, then the ability to process LCEVC standard video streams is improved, but the design and manufacturing costs significantly increase
Solution Approach 1:
The patent makes the existing color space conversion circuit perform multiple functions: its original function of converting color space and an additional function of combining base layer and enhancement layer residuals. By reconfiguring the conversion matrix, the same hardware circuit processes LCEVC video streams without requiring a new dedicated chip, thus achieving multi-functionality and reducing manufacturing costs
Solution Approach 2:
The patent changes the parameters (conversion matrix coefficients) of the existing color space conversion circuit to enable it to process LCEVC enhancement layer residuals. By adjusting the matrix parameters, the circuit transforms from performing color space conversion to performing residual combination, allowing the same hardware to adapt to different processing requirements without physical modification
2Ease of manufacture
If existing color space conversion circuit is used to process enhancement layer residuals, then the design and manufacturing costs are reduced, but the circuit must be reconfigured to handle negative residual values
Solution Approach 1:
The patent resolves the complexity issue by simply changing the conversion matrix parameters rather than redesigning the circuit architecture. The color space conversion circuit's existing structure is retained, and only the matrix coefficients are adjusted to handle negative residual values appropriately, minimizing the increase in device complexity while maintaining manufacturing simplicity
Data Source
AI summary
The present invention provides a receiver including a decoder, an upscale circuit and a color space conversion circuit. The decoder is configured to decode a video stream to generate a base layer and an enhancement layer. The upscale circuit is configured to perform an upscaling operation on the base layer to generate an upscaled base layer, wherein the upscaled base layer comprises luminance values of a plurality of pixels of a frame, and the enhancement layer comprises residuals of the plurality of pixels of the frame. The color space conversion circuit is configured to use a conversion matrix to combine the upscaled base layer and the enhancement layer to generate output video data.