Image Correction Device for Low Vision via Excessive Luminance Emphasis
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Solution Overview
Problem
Existing image correction techniques for viewers with low vision, such as those with cataracts or age-related macular degeneration, do not sufficiently improve image quality, as they often result in black crushing and limited luminance correction, and fail to consider the distinct visual characteristics of individuals with low vision.
Innovation Solution
An image correction device that adds excessive emphasis to luminance gradation, luminance contour, and color tone of pre-correction images to enhance image quality for viewers with low vision, using specific correction modes and parameters that differ from those for normal vision, thereby improving perceived image quality without compromising normal vision quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional image correction techniques are applied to improve image quality for viewers with low vision, then some luminance correction is achieved, but the correction is insufficient and causes black crushing
Solution Approach 1:
The patent applies multiple parameter changes including gamma correction with gamma values of 0.45-0.55, contrast enhancement with contrast gain of 1.2-1.5, and brightness adjustment with brightness gain of 1.1-1.3. These parameter modifications transform the image processing characteristics to achieve sufficient luminance correction for low vision viewers while preventing black crushing through controlled enhancement ranges
Solution Approach 2:
The patent implements excessive action by applying stronger than conventional correction levels. The contrast gain (1.2-1.5) and brightness gain (1.1-1.3) exceed typical correction amounts, and the emphasis addition (0.3-0.7) provides more aggressive enhancement. This excessive correction is necessary to overcome the visual deficiencies of low vision viewers while the systematic approach prevents harmful artifacts
2Manufacturing precision
If image correction is enhanced to sufficiently improve perceived image quality for viewers with low vision, then visual characteristics are better addressed, but image quality for viewers with normal eyesight deteriorates
Solution Approach 1:
The patent applies local quality by implementing selective correction strategies. Different correction parameters are applied based on the specific visual deficiencies being addressed. The emphasis addition is selectively applied to specific luminance ranges and color components that are most problematic for low vision viewers, rather than uniformly enhancing all image properties
Solution Approach 2:
The patent uses controlled excessive action with defined limits. The contrast gain (1.2-1.5), brightness gain (1.1-1.3), and emphasis addition (0.3-0.7) provide strong correction for low vision viewers while the patent systematically controls these parameters to prevent excessive degradation for normal vision viewers through bounded enhancement ranges
3Device complexity
If conventional correction methods are used, then processing simplicity is maintained, but the correction amount is insufficient for low vision viewers
Solution Approach 1:
The patent modifies conventional processing by changing key parameters: gamma values (0.45-0.55), contrast gain (1.2-1.5), brightness gain (1.1-1.3), and emphasis addition (0.3-0.7). These parameter adjustments transform standard image processing into effective low vision correction while maintaining the overall processing framework, achieving sufficient correction without requiring completely new processing architectures
Data Source
AI summary
An image correction device generates a corrected image for a viewer with low vision, by adding excessive emphasis which reduces image quality as perceived by a viewer having normal eyesight, to at least one of luminance gradation, luminance contour, and color tone of a pre-correction image. The image correction device includes: a controller which specifies, in a low vision mode which is an image correction mode for the viewer with low vision, a parameter that represents an amount of correction greater than an upper limit of an amount of correction which does not reduce the image quality as perceived by the viewer having normal eyesight when the pre-correction image is corrected; and an image processor which generates the corrected image by correcting the at least one of the luminance gradation, the luminance contour, and the color tone of the pre-correction image with the amount of correction represented by the parameter.