HDR Image Capture Using Threshold-Based Exposure Compensation
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Solution Overview
Problem
Existing high-dynamic-range imaging (HDR) methods are susceptible to regions that are too dark or too bright, leading to ghosting or shadowing due to variations in exposure values, affecting the synthesis quality of images.
Innovation Solution
An image capturing device and method that involves capturing a reference and processed image, determining bright and dark regions, performing brightness calculations with thresholds to obtain low and high exposure compensation values, and adjusting exposure accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a camera is used to shoot a plurality of images with different exposure values for synthesis using basic exposure image as benchmark, then HDR imaging is achieved, but ghosting or shadowing occurs due to susceptibility to regions that are too dark/too bright
Solution Approach 1:
The patent applies parameter changes by using multiple brightness thresholds (first brightness threshold and second brightness threshold) to dynamically adjust exposure compensation values. Instead of using a fixed exposure benchmark, the system calculates different exposure compensation values (first exposure compensation value and second exposure compensation value) based on the actual brightness distribution in the image, thereby adapting to varying lighting conditions and reducing ghosting or shadowing artifacts in HDR synthesis.
2Productivity
If exposure values are adjusted based on basic exposure image benchmark, then image synthesis is performed, but regions that are too dark/too bright affect the tolerance of synthesis quality
Solution Approach 1:
The patent implements local quality by applying different exposure compensation strategies to different brightness regions. The system identifies bright regions and dark regions separately and applies specific exposure compensation values tailored to each region's characteristics. This localized approach ensures that each region is processed with appropriate exposure adjustment, thereby improving overall synthesis quality tolerance and reducing artifacts.
Data Source
AI summary
An image capturing device with a sensor, a memory, and a processor is provided. The sensor captures an image of at least one target. The memory stores a plurality of instructions. The processor obtains the plurality of instructions to perform the following steps: controlling the sensor to capture a reference image and a processed image; capturing a first bright region and a dark region from the reference image, and capturing a second bright region from the processed image; performing calculations on a first brightness value of the first bright region and a second brightness value of the second bright region respectively with at least two first brightness thresholds, to obtain a first low exposure compensation value and a second low exposure compensation value; and obtaining a high exposure compensation value according to comparisons between a third brightness value of the dark region and at least two second brightness thresholds.