Signal Processing Device for Adaptive Luminance Adjustment
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Solution Overview
Problem
Current signal processing devices face challenges in improving image contrast, particularly for images with varying luminance deviations and resolutions, such as 4K and 8K, which affect the display quality on devices like TVs and monitors.
Innovation Solution
A signal processing device and image display apparatus that includes a display and a signal processing unit capable of receiving input images, analyzing luminance distribution, and adjusting luminance levels and change rates to enhance contrast. The device controls luminance adjustments based on the luminance deviation and distribution of input images, increasing luminance variation as frequency increases, and equalizes or adjusts luminance levels and change rates to improve contrast for both objects and backgrounds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If luminance adjustment is applied uniformly to all input images, then processing simplicity is maintained, but image contrast quality deteriorates due to varying luminance deviations
Solution Approach 1:
The patent applies different luminance adjustment change rates to different input images based on their individual luminance deviation characteristics. Specifically, images with larger luminance deviations are assigned smaller luminance adjustment change rates, while images with smaller luminance deviations receive larger luminance adjustment change rates. This localized adaptation to each image's specific properties resolves the contradiction by optimizing contrast quality for each image individually rather than applying a uniform processing approach.
2Manufacturing precision
If luminance adjustment change rate is increased for images with small luminance deviation, then contrast improvement is enhanced, but risk of over-adjustment and image quality degradation increases
Solution Approach 1:
The patent implements a feedback mechanism where the luminance deviation of each input image is first calculated and measured. Based on this measured value, the system dynamically determines the appropriate luminance adjustment change rate. This feedback loop ensures that images with small luminance deviations receive appropriately scaled adjustments, improving contrast without causing over-adjustment artifacts, thereby maintaining image quality stability while achieving contrast enhancement.
3Manufacturing precision
If different luminance adjustment change rates are applied to different images, then image contrast quality is improved, but processing time and computational load increase
Solution Approach 1:
The patent changes the processing parameter (luminance adjustment change rate) based on a measurable property of the input image (luminance deviation). By calculating the luminance deviation for each image and using this value to determine the appropriate adjustment rate, the system achieves optimized contrast quality for each image type while maintaining efficient processing through a systematic parameter adaptation approach rather than complex image-by-image analysis.
4Manufacturing precision
If luminance adjustment is optimized for images with large luminance deviation, then those images benefit from improved contrast, but images with small luminance deviation suffer from insufficient adjustment
Solution Approach 1:
The patent employs a dynamic luminance adjustment strategy where the luminance adjustment change rate is not fixed but varies according to the luminance deviation characteristics of each input image. This dynamic adaptation ensures that images with large luminance deviations receive appropriate adjustment rates for optimal contrast improvement, while images with small luminance deviations also receive suitable adjustments, thereby achieving universal applicability across different image types and resolving the contradiction between optimizing for specific cases and maintaining versatility.
Data Source
AI summary
The present disclosure relates to a signal processing device and an image display apparatus including the same. The image display apparatus includes a display, an image receiver configured to receive an input image, and a signal processing device configured to perform signal processing of the input image from the image receiver and to output image data to the display, wherein, when a luminance deviation of a first input image is greater than a luminance deviation of a second input image, the signal processing device controls a luminance adjustment change rate of a first input image to be less than a luminance adjustment change rate of the second input image. Accordingly, contrast of an image displayed on the display is improved.