Correlation Value Calculation Device Circuit Scale Reduction
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Solution Overview
Problem
High-resolution image correlation value calculation requires increased circuit scale, necessitating a reduction in circuit size without compromising calculation speed in noise reduction and motion vector detection processes.
Innovation Solution
A correlation value calculation device that performs bit-depth reduction on pixel values within a valid pixel value range, using a pixel value distribution calculation unit to determine conversion coefficients for converting 12-bit pixel data to 6-bit data, thereby reducing circuit scale while maintaining image characteristics for similarity determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution images are used for correlation value calculation, then image quality and detail are improved, but circuit scale increases
Solution Approach 1:
The pixel value range is segmented into multiple ranges, and different bit-depth reduction processes are applied to different segments. This allows selective reduction of bit-depth in certain ranges while maintaining higher precision in other ranges, thereby reducing circuit scale while preserving essential image quality
Solution Approach 2:
The patent changes the parameter of bit-depth from high (e.g., 12-bit) to low (e.g., 6-bit) through conversion coefficients. This parameter change reduces the circuit scale required for correlation value calculation while maintaining sufficient image characteristics for similarity determination
2Device complexity
If bit-depth reduction is applied to reduce circuit scale, then circuit complexity is reduced, but image characteristics may be lost
Solution Approach 1:
Different bit-depth reduction strategies are applied to different local regions or pixel value ranges. By analyzing the local pixel value distribution and applying appropriate conversion coefficients to each range, the patent maintains essential image characteristics while reducing circuit scale
Solution Approach 2:
Conversion coefficients act as intermediaries between high-resolution input images and low-bit-depth processing circuits. These coefficients enable lossless or near-lossless conversion within each pixel value range, preserving image characteristics while adapting to reduced circuit capabilities
Data Source
AI summary
A correlation value calculation device for calculating a correlation value between a base block within an image and at least one reference block within the image or other image includes a pixel value distribution calculation unit configured to calculate a pixel value distribution of pixels within the image and select a range of pixel values of a large number of pixels as a valid pixel value range, a conversion coefficient calculation unit configured to calculate conversion coefficients for converting pixels of the valid pixel value range into a prescribed bit-depth, and a pixel value conversion unit configured to perform a bit-depth reduction process on pixels within the base block and pixels within the reference block on the basis of the conversion coefficients.