Image Display Processing With Importance-Based Contrast Control
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Solution Overview
Problem
As display resolution and peak luminance increase in image display apparatuses, power consumption also rises, leading to a trade-off between high power consumption and low contrast ratios.
Innovation Solution
An image display apparatus with a signal processing device that adjusts the average picture level of output images by increasing the contrast ratio in important areas and decreasing luminance in less important areas, based on importance levels calculated through segmentation, depth, light field, or prominence analysis, to improve contrast while reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If display resolution and peak luminance are increased, then image sharpness and brightness are improved, but power consumption increases
Solution Approach 1:
The patent applies local quality by differentiating processing between important and unimportant areas of the image. Important areas maintain high luminance and contrast ratios to preserve image sharpness and brightness, while unimportant areas have their luminance reduced to lower power consumption. This spatially differentiated approach allows the display to achieve high peak luminance where needed without uniformly increasing power consumption across the entire display.
2Use of energy by moving object
If brightness correction is applied to reduce power consumption, then energy efficiency is improved, but contrast ratio deteriorates
Solution Approach 1:
The patent resolves this contradiction by applying different brightness correction strategies to different spatial regions. In important areas, the contrast ratio is maintained or enhanced through selective luminance adjustment, while in unimportant areas, aggressive luminance reduction is applied to lower power consumption. This allows the system to achieve overall power savings without degrading the contrast ratio in visually critical regions.
Solution Approach 2:
The patent segments the image into important and unimportant areas based on various criteria (edges, textures, semantic content). This segmentation enables differential processing where contrast ratio preservation is prioritized in important areas while power consumption reduction is prioritized in unimportant areas, thus resolving the contradiction between these two parameters.
Data Source
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AI summary
An image display apparatus is disclosed. An image display apparatus according to an embodiment of the present disclosure comprises: a display; a signal processing device configured to perform signal processing of an input image and output an image signal corresponding to an output image to, wherein, in response to an importance level of a first area in the input image being a first level and an importance level of a second area being a second level lower than the first level, the signal processing device is configured to control the average picture level of the output image to be lower than the average picture level of the input image by increasing a contrast ratio of the first area and decreasing a luminance level of the second area. Accordingly, it is possible to improve contrast ratio while reducing power consumption.