Display Device Adaptive Tone Mapping Object Background Separation
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Solution Overview
Problem
Existing dynamic tone mapping techniques struggle to effectively extend the brightness range and enhance contrast of images, leading to issues such as overly bright or dark outputs and difficulty in distinguishing between bright and dark areas.
Innovation Solution
A display device with a controller that separates objects and backgrounds in an image and adjusts their luminance using a tone curve, which is calculated based on threshold values obtained through algorithms like Otsu, to extend the brightness range and enhance contrast.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic tone mapping adjusts brightness based on maximum brightness only, then the tone curve can be adaptively changed according to scene, but the brightness range becomes narrow and contrast weakens
Solution Approach 1:
The patent segments the image into multiple regions based on luminance thresholds (e.g., dark area, mid-tone area, bright area) and applies different tone curve adjustments to each region. This allows the system to maintain adaptability to scene changes while expanding the overall brightness range by treating different luminance regions differently rather than applying a uniform adjustment.
Solution Approach 2:
The patent applies local quality by adjusting the tone curve parameters differently for different luminance regions. Specifically, it adjusts the tone curve separately for dark areas, mid-tone areas, and bright areas, allowing each region to receive optimized processing that expands the brightness range while maintaining adaptability to the overall scene.
2Device complexity
If dynamic tone mapping uses a single tone curve adjustment, then the process is simple, but the image cannot distinguish between bright and dark areas properly
Solution Approach 1:
The patent segments the tone curve adjustment process into multiple stages, where different portions of the tone curve are adjusted separately based on luminance thresholds. This segmentation enables precise control over how bright and dark areas are treated, improving image quality precision while maintaining reasonable process complexity through systematic division of the adjustment task.
Solution Approach 2:
The patent employs dynamics by making the tone curve adjustment adaptive and flexible. The tone curve parameters are dynamically modified based on the detected luminance distribution and scene characteristics, allowing the system to optimize image quality precision for each specific input image while maintaining a manageable processing framework through dynamic adaptation rather than fixed complex rules.
3Illumination intensity
If the tone curve is adjusted to expand brightness range, then more luminance levels can be displayed, but the contrast between bright and dark areas may be reduced
Solution Approach 1:
The patent applies local quality by adjusting the tone curve differently for different luminance regions. It expands the brightness range in dark areas while maintaining or enhancing contrast in bright areas, and vice versa. This region-specific adjustment allows simultaneous expansion of overall brightness range and preservation of image contrast, as each region's characteristics are considered in the tone curve modification.
Solution Approach 2:
The patent uses dynamics by implementing adaptive tone curve adjustment that responds to the input image's luminance distribution. The system dynamically determines the appropriate tone curve parameters based on the detected characteristics, allowing it to expand brightness range when needed while preserving contrast through adaptive response to the specific image content and luminance distribution.
Data Source
AI summary
The present invention relates to a display device for providing improved dynamic tone mapping, the device comprising: a control unit for performing tone mapping to adjust a luminance of an input image by using a tone curve; and a display unit for displaying an image, the luminance of which has been adjusted by tone mapping, wherein the control unit may calculate a threshold value for separation of an object and a background in the input image, and may change the tone curve on the basis of the threshold value.