Image Processing Circuit Gamma Correction Error Detection
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Solution Overview
Problem
Existing image processing devices cannot reliably determine if gamma correction has been performed correctly, leading to potential abnormal displays remaining uncorrected until human intervention.
Innovation Solution
An image processing circuit with a gamma correction circuit, output image histogram calculation circuit, input image histogram calculation circuit, reference histogram calculation circuit, and histogram comparison circuit, which uses a look-up table to perform gamma correction and calculate reference histograms for comparison with output histograms to detect errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If gamma correction is performed using a look-up table, then image processing efficiency is improved, but the ability to detect errors in the gamma correction process deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the output image histogram is compared with a reference histogram (calculated from input image histogram and LUT) to detect gamma correction errors. The histogram comparison circuit continuously monitors the gamma correction process and provides feedback signals when discrepancies are detected, enabling real-time error detection without compromising the efficiency of the LUT-based gamma correction.
Solution Approach 2:
The patent introduces histograms as an intermediary element to detect gamma correction errors. Instead of directly monitoring the gamma correction process, the system uses histograms (both output image histogram and reference histogram) as mediators to indirectly verify the correctness of gamma correction. This intermediary approach allows error detection while maintaining the efficiency of the LUT-based correction process.
2Device complexity
If no error detection mechanism is implemented, then device complexity is reduced, but the reliability of image processing deteriorates
Solution Approach 1:
The patent segments the gamma correction verification process into distinct functional modules: output image histogram calculation circuit, reference histogram calculation circuit, and histogram comparison circuit. This segmentation allows the error detection mechanism to be added as separate, modular components without significantly increasing the overall system complexity. Each module has a specific function, making the system easier to implement and maintain while improving reliability.
3Duration of action of stationary object
If transient errors in the LUT are not detected, then continuous operation is maintained, but permanent errors remain undetected causing abnormal display
Solution Approach 1:
The patent implements continuous monitoring of gamma correction through ongoing histogram comparison operations. The output image histogram calculation circuit and reference histogram calculation circuit continuously generate histograms, and the histogram comparison circuit continuously compares them to detect both transient and permanent errors in the LUT. This continuous verification ensures that errors are detected promptly while maintaining uninterrupted image processing operations.
Data Source
AI summary
The image processing circuit includes a gamma correction circuit configured to perform a gamma correction on input image data using a look-up table, and then output output image data, an output image histogram calculation circuit configured to calculate an output image histogram, an input image histogram calculation circuit configured to calculate an input image histogram, a reference histogram calculation circuit configured to calculate a reference histogram from the input image histogram based on the look-up table, and a histogram comparison circuit configured to perform a comparison between the output image histogram and the reference histogram.