Vehicle Display System Dynamic Range Compression via Histogram Segmentation
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Solution Overview
Problem
Imaging devices for vehicles face challenges in capturing images with large brightness differences, leading to issues like unsharp images, blocked shadows, and blown-out highlights due to lower dynamic range in display devices, which affect visibility and image quality.
Innovation Solution
A display system comprising an imaging device, a control device, and a display device that performs dynamic range compression by generating second image data based on first image data, using a histogram to divide illuminance ranges and adjust gray levels, with the control device calculating compressibility for each range, potentially incorporating a neural network for predictive updates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dynamic range compression is performed to adapt imaging data to display device capabilities, then the display device can show images captured by high dynamic range imaging devices, but the displayed image becomes unsharp and generates blocked up shadows and blown-out highlights
Solution Approach 1:
The patent divides the histogram into two or more illuminance ranges and calculates compressibility separately for each range. This segmentation allows different compression strategies to be applied to different brightness regions, preventing uniform compression from causing image degradation while adapting the high dynamic range imaging data to the display device's lower dynamic range capabilities.
2Adaptability or versatility
If dynamic range compression is performed using conventional methods, then the image data can be converted to match display device dynamic range, but the conversion process causes loss of image quality with shadows and highlights
Solution Approach 1:
The patent applies different compressibility values to different illuminance ranges based on local histogram characteristics. By determining compressibility separately for each illuminance range rather than applying a uniform compression ratio, the system preserves local image quality in critical regions while still achieving overall dynamic range adaptation.
3Device complexity
If the display device has lower dynamic range than the imaging device, then the display device can be simpler and more cost-effective, but it cannot directly display the full dynamic range of captured images
Solution Approach 1:
The patent changes the gray level parameters of the imaging data through dynamic range compression to match the display device's dynamic range capabilities. By calculating compressibility based on histogram analysis and adjusting gray levels accordingly, the system enables the simpler display device to effectively display images captured with higher dynamic range imaging devices.
Data Source
AI summary
Provided is a display system with which visibility can be improved.The display system includes an imaging device, a control device, and a display device. The imaging device includes first pixels arranged in a matrix, and the display device includes second pixels arranged in a matrix. The imaging device has a function of generating first image data on the basis of the illuminance of light emitted to the first pixels. The control device has a function of forming a histogram on the basis of the first image data and dividing the histogram into two or more illuminance ranges. The control device has a function of converting the gray levels which are included in the first image data as information and correspond to the illuminance of the light emitted to the first pixels, thereby generating second image data obtained by performing dynamic range compression on the first image data. The compressibility for the dynamic range compression is calculated for each illuminance range by the control device on the basis of the value of integral in each illuminance range of the histogram.