Image Processing Apparatus Directional Moire Suppression
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Solution Overview
Problem
Existing image capturing apparatuses suffer from false colors caused by color moire due to differences in sampling frequencies of RGB colors, leading to decreased resolution and color bleeding, which previous countermeasures have been unable to effectively prevent.
Innovation Solution
An image processing apparatus comprising a direction detection unit, moire detection unit, and moire suppression unit that detects the direction of picture patterns and moire levels in input images using directional correlation values, and suppresses moire by generating and mixing reduced images in horizontal, vertical, and oblique directions based on detected moire index values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If synchronization processing is performed on three colors RGB in each pixel, then color information is captured, but turnback occurs due to difference in sampling frequencies causing color moire and false colors
Solution Approach 1:
The patent segments the image processing into multiple directional components (horizontal, vertical, and oblique directions). By detecting picture patterns and moire in different directions separately and processing each direction independently, the system captures color information while suppressing color moire specific to each direction, thereby resolving the contradiction between color accuracy and moire prevention.
Solution Approach 2:
The patent introduces an intermediary processing step that detects picture patterns and moire characteristics before final color synthesis. This intermediary detection mechanism identifies problematic areas and applies selective suppression, acting as a mediator between raw color data and final output, preventing false colors while preserving essential color information.
2Object-affected harmful factors
If moire suppression processing is applied to prevent false colors, then color moire is reduced, but image resolution decreases
Solution Approach 1:
The patent applies local quality by performing moire suppression selectively based on detected picture patterns and moire characteristics. Instead of uniform suppression across the entire image, the system identifies specific regions with moire problems and applies suppression only to those areas, preserving resolution in regions without moire while eliminating false colors where needed.
Solution Approach 2:
The patent implements partial action by applying moire suppression only to specific directional components (horizontal, vertical, oblique) where moire is detected, rather than suppressing all frequency information uniformly. This selective approach removes harmful moire patterns while maintaining sufficient detail and resolution in the overall image.
3Object-affected harmful factors
If directional detection and multi-directional moire suppression are implemented, then color moire in various directions is suppressed, but device complexity increases
Solution Approach 1:
The patent segments moire suppression into discrete directional components (horizontal, vertical, oblique), allowing each direction to be processed independently with dedicated detection and suppression algorithms. This segmentation makes the complex multi-directional problem manageable through modular processing steps, reducing overall system complexity compared to attempting simultaneous omnidirectional suppression.
Data Source
AI summary
An image processing apparatus includes a direction detection unit configured to detect a direction of a picture pattern of each picture in an input image having a predetermined color pixel array; a moire detection unit configured to detect a moire level by periodicity of a pixel value of each pixel in the input image depending on the direction as a moire index value; and a moire suppression unit configured to suppress the moire level in the input image based on the moire index value detected by the moire detection unit. A method thereof and a program therefor are also provided.