HDR Video Exposure Compensation via Instant Frame Ratios
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Solution Overview
Problem
Conventional high dynamic range (HDR) video technologies rely on queues for synchronization between image sensors and signal processors, leading to issues like abnormal composition and flickering due to asynchronous exposure frames, which disrupt the continuity of the image.
Innovation Solution
A method for exposure compensation in HDR video that calculates and applies an instant exposure value ratio between sequential frames without relying on queue control, ensuring synchronized exposure values across frames to prevent discontinuity and abnormal composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If queue control is used to synchronize image sensor and signal processor parameters, then parameter synchronization is achieved, but exposure frame discontinuity and abnormal composition occur
Solution Approach 1:
The patent applies preliminary action by pre-calculating exposure value ratios between sequential frames and storing them in a buffer before processing. This allows the system to anticipate and compensate for exposure differences before they cause discontinuity, eliminating the need for queue-based synchronization that causes abnormal composition. The exposure compensation is prepared in advance and applied smoothly across frame transitions.
2Illumination intensity
If multiple frames are used to render new exposure values, then HDR dynamic range is improved, but processing complexity and flickering increase
Solution Approach 1:
The patent changes the parameter approach by using exposure value ratios between sequential frames as the key parameter for compensation. Instead of complex multi-frame rendering algorithms, the system calculates simple ratios of exposure values and applies them as compensation factors. This parameter transformation simplifies the processing while maintaining HDR dynamic range benefits, reducing both computational complexity and flickering artifacts.
3Reliability
If queue-based parameter delay is implemented, then exposure and processor parameters take effect simultaneously, but abnormal composition and flickering occur
Solution Approach 1:
The patent implements feedback by continuously monitoring exposure value ratios between sequential frames and using this information to dynamically adjust compensation parameters. The system calculates the ratio, applies compensation, and ensures smooth transitions by comparing consecutive frame exposures. This feedback mechanism eliminates abnormal composition and flickering while maintaining parameter synchronization without requiring queue-based delays.
Data Source
AI summary
A method and a circuitry for exposure compensation applied to a high dynamic range video are provided. The circuitry is adapted to an image-acquisition device. In the method, when a video is received, the pixel values for each of the sequential frames can be obtained. Next, an exposure value ratio between two adjacent frames is obtained. A processor exposure value ratio of an image signal processor can be regarded as an initial exposure value ratio. A fixed adjustment ratio is used to control the image signal processor and an image sensor of the image-acquirement device so as to calculate an exposure value ratio for each of the frames. The exposure value ratio is referred to for performing the high dynamic range compensation for the frames so as to output an HDR video.