Binocular 3D Tone Mapping Using Disparity-Based Contrast Compensation
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Solution Overview
Problem
Tone mapping of binocular 3D images reduces brightness and contrast, impairing the perception of the displayed image.
Innovation Solution
An image processing method that generates a second tone mapping curve based on the disparity map and contrast of a binocular image to compensate for reduced contrast, ensuring a minimum disparity variation for 3D perception by human eyes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If tone mapping is performed on binocular 3D image to adapt to display device capability, then the image can be displayed on low dynamic range devices, but brightness and contrast are reduced which impairs 3D perception
Solution Approach 1:
The patent divides the tone mapping process into two distinct stages: first tone mapping for display adaptation and second tone mapping for contrast compensation. This segmentation allows each stage to serve its specific function without interfering with the other, resolving the contradiction between display adaptability and contrast preservation
Solution Approach 2:
The patent performs preliminary contrast analysis and disparity map generation before the second tone mapping. By pre-calculating the contrast requirements and disparity information, the system can compensate for contrast loss in advance, ensuring that 3D perception is maintained after tone mapping
2Ease of manufacture
If first tone mapping curve is generated based only on image content, then tone mapping can be performed, but contrast of the tone mapped binocular image falls below the minimum disparity variation requirement for 3D perception
Solution Approach 1:
The patent transitions from one-dimensional image content analysis to two-dimensional analysis by incorporating the disparity map dimension. This additional dimension provides depth information necessary for maintaining 3D perception accuracy, allowing the system to meet minimum disparity variation requirements while performing tone mapping
3Illumination intensity
If brightness is reduced through tone mapping to fit display device dynamic range, then HDR image can be displayed on LDR devices, but user perception of the binocular 3D image is reduced
Solution Approach 1:
The patent implements a feedback mechanism where the contrast of the first tone mapped image is analyzed, and this information feeds into the generation of the second tone mapping curve. This feedback loop ensures that the final tone mapping compensates for any contrast or perception degradation caused by the initial brightness reduction
Solution Approach 2:
The patent changes multiple parameters in sequence: first the luminance parameter for display adaptation, then the contrast parameter for perception maintenance. By adjusting these parameters in a controlled sequence rather than simultaneously, the system achieves both display compatibility and perception reliability
Data Source
AI summary
This application relates to the field of image processing technologies, and discloses an image processing method and system, and a device, to resolve a problem that tone mapping greatly affects perception of a binocular 3D image. Based on a disparity map of a binocular image, a tone mapping curve is determined for a display device to display an image, instead of being generated merely based on image content. This makes a contrast of a tone mapped binocular image reach at least a level before tone mapping, thereby meeting a minimum disparity variation requirement for 3D perception by human eyes, and improving 3D perception of a 3D image displayed by the display device.