Color Space Converter Circuit for Reducing Video Artifacts
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Solution Overview
Problem
Digital image and video transmission often results in noticeable artifacts due to transmission errors, which current error correction methods fail to fully address, especially when color components fall outside valid ranges in the RGB color-space during conversion from YCbCr.
Innovation Solution
A circuit and method that detects pixels with components outside predetermined bounds in the YCbCr color-space and outputs pixels in the RGB color-space with adjusted components to prevent invalid values, using a buffer and detector to ensure valid color components, thereby reducing artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If error correcting codes are used to detect and correct corrupted data, then transmission reliability is improved, but bandwidth requirement and processing complexity increase
Solution Approach 1:
The patent performs preliminary detection of invalid color components before they are displayed or further processed. By checking whether YCbCr components map to valid RGB ranges in advance and replacing invalid components proactively, the system prevents artifact formation without requiring complex post-processing error correction codes
Solution Approach 2:
The patent changes the approach from using complex error correcting codes to a simpler parameter-based validation method. It checks specific parameter ranges (RGB color component bounds) and applies simple replacement rules when parameters are invalid, avoiding the need for heavy FEC codes while maintaining visual quality
2Adaptability or versatility
If truncated values are used for color components outside valid ranges, then device compatibility is improved, but visual artifacts increase
Solution Approach 1:
The patent converts the harmful effect of invalid color values into a benefit by using the detection of out-of-range components as a trigger for intelligent replacement. Instead of simply truncating (which causes artifacts), the system uses the invalidity detection to activate a replacement mechanism that preserves visual quality while ensuring device compatibility
Solution Approach 2:
The patent introduces an intermediary processing step between color space conversion and display output. This intermediary layer validates RGB components and replaces invalid ones with predetermined values, acting as a mediator that ensures both device compatibility and visual quality without requiring changes to either the encoder or display device
Data Source
AI summary
A circuit and method for reducing artifacts in decoded color video and images are disclosed. The circuit includes a buffer for receiving an input pixel in a first color-space, and a detector for determining after transformation into a second color-space, if at least one component of the transformed pixel would fall outside a predetermined range. The determination may be made by comparing components of the input pixel, to corresponding ranges in the first color-space. Upon determining that at least one component of the transformed pixel would be outside a corresponding predetermined bound in the second color-space, the detector causes the circuit to output a pixel in the first color-space, with at least one predetermined component. The output of the circuit may subsequently be converted to the second color-space by an external color-space converter and displayed onto a color display. The method reduces visible artifacts caused by clipping during color-space conversion.