Depth-Based Exposure Control for Wide Dynamic Range Imaging
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Solution Overview
Problem
Existing methods for obtaining wide dynamic range images often result in deteriorated image quality due to fixed exposure times for underexposed and overexposed images, which fail to accurately capture scene details.
Innovation Solution
An exposure control method based on depth information, where a cached master image is processed to determine a foreground part, and reference exposure is used to set exposures for dark and bright images, ensuring appropriate dynamic range and image clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed exposure times are used for underexposed and overexposed images, then the wide dynamic range image can be obtained, but the image quality deteriorates
Solution Approach 1:
The patent applies dynamics by making the exposure time variable rather than fixed. The exposure times for underexposed, reference, and overexposed images are dynamically adjusted based on the luminance of the foreground part. This allows the system to adapt exposure parameters to the specific scene requirements while maintaining wide dynamic range capability and image quality.
Solution Approach 2:
The patent applies local quality by focusing exposure control on the foreground part of the scene. The exposure times are determined based on the luminance characteristics of the foreground part specifically, allowing different parts of the scene to be captured with appropriate exposure levels. This ensures that the main subject (foreground) is properly exposed while still capturing the full dynamic range of the scene.
2Manufacturing precision
If exposure time is adjusted to capture scene details, then image quality improves, but the exposure control complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the scene into foreground part and background parts based on depth information. The exposure control is specifically applied to the foreground part, which is segmented from the rest of the scene. This segmentation simplifies the exposure control process by focusing computational efforts on the most important part of the scene while maintaining overall image quality.
Solution Approach 2:
The patent uses depth information as an intermediary to guide exposure control. The depth map is used to identify the foreground part, which then serves as the basis for determining exposure times. This intermediary approach simplifies the exposure control complexity by providing a clear criterion (depth-based foreground identification) for making exposure decisions.
Data Source
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AI summary
Disclosed in the present invention is a depth-based exposure control method. The exposure control method comprises: (S11) processing scene data so as to obtain a foreground part of a cached main image; (S12) determining reference exposure according to brightness information of the foreground part; (S13) determining dark frame exposure and bright frame exposure according to the reference exposure; and (S14) controlling an imaging device (20) to expose according to the reference exposure, the dark frame exposure and the bright frame exposure. Also disclosed in the present invention are an exposure control device (10) and an electronic device (100).