Skin Outline Correction Using Switched High-Pass Filters
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Solution Overview
Problem
Existing outline correction techniques fail to provide sufficient softening of skin wrinkles and spots in high-definition images, particularly in zoomed-up images, leading to unnatural enlargement of features.
Innovation Solution
A device employing multiple high-pass filters with varying frequency characteristics and rectangular wave responses, allowing for gradual softening of outlines by switching between these filters based on the detail gain, ensuring a smooth transition from emphasizing to softening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single high-pass filter is used for outline extraction, then the outline can be emphasized at normal frequency bands, but the softening effect becomes insufficient for zoomed-up images
Solution Approach 1:
The patent divides the single high-pass filter into multiple high-pass filters with different frequency characteristics. Each filter is optimized for specific frequency ranges, allowing the system to handle both normal and zoomed-up images effectively. The outline extraction function is segmented across multiple filters rather than relying on one filter to handle all cases.
Solution Approach 2:
The patent dynamically switches between different high-pass filters based on the detail gain value. When the detail gain is positive, one filter is selected for emphasis; when negative, another filter is selected for softening. This dynamic adaptation allows the system to maintain effectiveness across varying image conditions and zoom levels.
2Ease of operation
If the detail gain is switched from positive to negative for outline emphasis to softening, then the outline correction direction changes, but abrupt changes in image quality occur
Solution Approach 1:
The patent prepares multiple high-pass filters in advance, each optimized for specific gain ranges. When switching from positive to negative detail gain, the system transitions between pre-configured filters rather than making abrupt changes. This beforehand preparation cushions the transition and prevents sudden image quality degradation.
Solution Approach 2:
The patent changes the frequency characteristics parameter of the high-pass filter based on the detail gain value. By adjusting which filter is active according to the gain parameter, the system maintains image quality continuity during transitions between emphasis and softening modes.
Data Source
AI summary
[Problem to be Solved] To provide an outline correction processing device capable of achieving an softening effect of sufficiently lightening wrinkles and spots even in a case where wrinkles and spots on a skin of a person captured by a television camera is magnified on display.[Means of Solving Problem] An outline correction processing device is provided with a first high-pass filter having a function of emphasizing an outline portion of an image signal, and one or more second high-pass filters having a function of weakening the outline portion of the image signal, wherein the first high-pass filter and the second high-pass filters are switched and connected with respect to the image signal being entered, so as to correct an outline portion of a specific color component of the image signal being entered.