Video Display Local Luminance Correction for Shadow Visibility
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing video processing techniques, such as Multi Scale Retinex (MSR), fail to consider the feature of objects and reflection properties when adjusting contrast and dynamic range, leading to uniform correction that does not enhance visibility, especially in shadow portions.
Innovation Solution
A video display device that performs local luminance and saturation corrections based on feature analysis, using a combination of Retinex processing models like McCann 99 and MSR, to enhance visibility and definition by decomposing video signals according to light reflection properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If uniform correction is performed regardless of object features in MSR processing, then dynamic range compression is achieved, but visibility improvement is insufficient especially in shadow portions
Solution Approach 1:
The patent applies local quality by performing video correction processing tailored to different luminance regions. Specifically, it divides the video into multiple luminance regions (highlight, midtone, shadow) and applies different correction intensities and parameters to each region. This allows the system to enhance visibility in shadow portions while maintaining appropriate contrast in other regions, rather than applying uniform correction across the entire image.
Solution Approach 2:
The patent changes processing parameters based on object features and luminance characteristics. It dynamically adjusts correction parameters such as gamma values, contrast enhancement factors, and saturation levels according to the detected luminance distribution and object features in different regions. This enables adaptive correction that improves visibility while preserving natural appearance.
2Illumination intensity
If local luminance correction is performed with high correction intensity, then shadow visibility is improved, but color rendering may be degraded
Solution Approach 1:
The patent applies local quality by differentiating correction strategies for different luminance regions. In shadow regions, it applies stronger luminance correction to improve visibility, while in midtone and highlight regions, it uses more conservative correction to preserve color accuracy. The system also applies region-specific saturation adjustments to maintain natural color appearance even where luminance correction is intensive.
Solution Approach 2:
The patent employs feedback mechanisms by continuously monitoring the luminance distribution and color characteristics before and after correction. It uses this feedback to dynamically adjust correction parameters, ensuring that shadow visibility enhancement does not push colors beyond natural ranges. The system adapts its correction strength based on the actual video content and lighting conditions.
Data Source
AI summary
An object is to obtain a visibility-improved video while more favorably maintaining a color rendering property in a video display device. To achieve the object, a video input unit, a video correcting unit that performs video correction on a video input by the video input unit, and a video display unit that displays the video corrected by the video correcting unit are included, and the video correcting unit is configured to perform local luminance correction on the video input by the video input unit, acquire a correction intensity for each part of the local luminance correction, and perform local saturation correction based on the correction intensity.