Image Processing Apparatus Brightness Contrast Correction
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Solution Overview
Problem
Current image processing technologies for HDR images fail to effectively adjust brightness, particularly in retouching functions, as they do not adequately consider the influence of brightness contrast, especially during enlargement, leading to incongruous brightness adjustments.
Innovation Solution
An image processing apparatus and method that change the display area of an image, acquire luminance values considering brightness contrast in both the original and enlarged areas, and correct the luminance based on these values to maintain consistent brightness perception.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If HDR image processing is performed without considering brightness contrast, then the dynamic range and luminance are improved, but the main subject brightness decreases due to simultaneous contrast effects
Solution Approach 1:
The patent introduces a brightness perceptual image as an intermediary representation that quantifies the influence of brightness contrast before performing brightness adjustment. This mediator allows the system to account for simultaneous contrast effects and make more accurate brightness corrections to the main subject.
Solution Approach 2:
The patent changes the parameter space by creating a brightness perceptual image that transforms the original luminance values into a new representation that reflects perceived brightness including contrast effects. This parameter transformation enables more intuitive and accurate brightness adjustment.
2Object-affected harmful factors
If the display area is enlarged during retouching, then the brightness contrast influence is reduced, but the user cannot accurately perceive how much brightness correction is needed
Solution Approach 1:
The patent uses the brightness perceptual image as feedback information that quantifies the brightness contrast influence. This feedback is used to guide the brightness adjustment process, allowing users to make accurate corrections even when viewing enlarged images where contrast effects are reduced.
3Device complexity
If brightness adjustment is performed based on luminance values without considering brightness contrast, then the processing is simple, but the adjustment results are incongruous and unsatisfactory
Solution Approach 1:
The patent performs preliminary action by generating the brightness perceptual image before the actual brightness adjustment. This preliminary step quantifies the brightness contrast influence, enabling more precise adjustment decisions to be made in subsequent steps.
Data Source
AI summary
An image processing apparatus comprises a changing unit configured to change a display area of an image from a first display area to a second display area including at least a portion of the first display area, an acquiring unit configured to acquire a first value indicating luminance, in which brightness contrast is considered, in an image displayed in the first display area and a second value indicating luminance, in which brightness contrast is considered, in an image displayed in the second display area, and a correcting unit configured to correct luminance of the image displayed in the second display area based on the first value and the second value that are acquired by the acquiring unit.