Digital Image Color Artifact Correction via Adaptive Chrominance Filtering
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Solution Overview
Problem
Current digital image processing techniques fail to effectively distinguish and correct false colors and purple fringing, often leading to undesired color loss and excessive reduction in image quality due to incorrect interpolation and chromatic aberration.
Innovation Solution
A processing apparatus and method that includes a color artifact correction block using a pixel-by-pixel approach with a mobile working window, incorporating false colors and purple fringing correction sub-blocks, which modify chrominance planes based on luminance and chrominance information, and employs median filtering with dynamic range modulation to preserve sharp edges and avoid color bleeding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If blurring of chrominance planes is applied to correct false colors, then false color artifacts are reduced, but genuine chrominance details and sharp colored edges are lost
Solution Approach 1:
The patent applies different processing strengths to different regions of the image by calculating a processing strength map based on local chrominance variance and gradient magnitude. Regions with high chrominance variance and gradient (sharp edges) receive lower processing strength to preserve details, while regions with low variance receive higher strength to effectively remove false colors. This local adaptation resolves the contradiction between false color correction and chrominance detail preservation.
Solution Approach 2:
The patent dynamically adjusts processing parameters (filtering strength, window size) based on local image characteristics such as chrominance variance and gradient magnitude. By changing parameters adaptively rather than applying fixed blurring, the system achieves effective false color correction in uniform regions while preserving sharp chrominance edges, thus resolving the information loss problem.
2Manufacturing precision
If desaturation of chrominance planes is applied to correct purple fringing, then purple fringing artifacts are reduced, but overall image saturation is excessively reduced
Solution Approach 1:
The patent identifies purple fringing regions through gradient analysis and applies desaturation only to those specific areas. By calculating gradient magnitude and direction, the system distinguishes purple fringing artifacts from genuine saturated edges, applying correction only where needed. This localized approach corrects purple fringing while preserving overall image saturation, resolving the contradiction between artifact removal and saturation preservation.
3Manufacturing precision
If conventional correction techniques are applied to both false colors and purple fringing, then color artifacts are reduced, but computational complexity and memory requirements increase
Solution Approach 1:
The patent employs a unified correction framework that handles both false colors and purple fringing through a single processing pipeline. The same gradient-based analysis and adaptive filtering mechanism are used for both artifact types, eliminating the need for separate complex processing systems. This multi-functional approach reduces computational complexity and memory requirements while maintaining correction quality for both artifact types.
Data Source
AI summary
An image processing apparatus suitable for processing a digital image in YCrCb color space, the image having an initial luminance plane Y and two initial Cr, Cb chrominance planes, the processing apparatus including a first block that receives the initial luminance plane Y of the digital image and processes and modifies the initial luminance plane Y in order to provide a modified luminance plane Y in output; a color artifact correction block, operating in parallel with the first block, the correction block receiving the initial planes Y, Cr, Cb of the image and modifying the initial chrominance planes Cr and Cb through a pixel by pixel processing approach with a mobile working window, the correction block having a false colors correction sub-block and a purple fringing correction sub-block, or both, the sub-blocks structured to modify values of the initial Cr, Cb chrominance planes based on information contained in the initial Cr, Cb chrominance planes and also based on information contained in the initial luminance plane Y.