Region-Based Video Exposure Control for Stable Cropped Image Quality
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Solution Overview
Problem
Existing video extraction techniques fail to optimize exposure amount, white balance, and lens focus according to the position of the extracted region, leading to potential image quality issues when the position of the extracted region changes.
Innovation Solution
A video creation method that sets multiple regions with smaller angles of view within a larger viewing angle, designates a reference region with appropriate exposure, and adjusts conditions like exposure time and stop amount based on this reference to maintain image quality during region changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If video extraction is performed without optimizing exposure conditions according to region position, then device complexity is reduced, but image quality of extracted video deteriorates
Solution Approach 1:
The patent applies local quality by setting different exposure conditions for different regions within the imaging area. The imaging apparatus divides the imaging region into multiple regions and assigns appropriate exposure conditions to each region based on its characteristics, ensuring that each extracted video region maintains optimal image quality without requiring a completely different system for each region.
Solution Approach 2:
The patent implements parameter changes by dynamically adjusting exposure conditions (such as exposure time, aperture, or gain) based on the position and characteristics of the extracted region. The control unit modifies these parameters in real-time according to the selected region, allowing the system to maintain high image quality across different extraction positions without increasing hardware complexity.
2Manufacturing precision
If exposure conditions are optimized for each extracted region position, then image quality of extracted video is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by using a single imaging apparatus that can serve multiple functions: capturing wide-angle video, extracting multiple different regions, and optimizing exposure for each region. The control unit acts as a universal controller that manages different exposure conditions for various regions without requiring separate dedicated systems for each extraction task.
Solution Approach 2:
The patent implements dynamics by making the exposure conditions adjustable and adaptable based on the selected region. Rather than having fixed exposure settings, the system dynamically changes exposure parameters according to the position and characteristics of the extracted region, allowing one system to handle multiple extraction scenarios with optimal quality for each.
3Speed
If the position of the extracted region is changed without reoptimizing exposure conditions, then operation speed is improved, but image quality of extracted video deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-establishing the framework for region-based exposure control. The system divides the imaging area into multiple regions in advance and stores appropriate exposure conditions for each region. When a region is selected for extraction, the control unit can quickly retrieve and apply the pre-determined exposure conditions for that region, enabling fast switching without quality loss.
Solution Approach 2:
The patent implements feedback by continuously monitoring the selected region and automatically adjusting exposure conditions based on region characteristics. The control unit receives information about the current extracted region and responds by applying the appropriate exposure settings, ensuring that image quality is maintained during region switching without requiring manual intervention or slow re-optimization processes.
Data Source
AI summary
Provided is a video creation method capable of obtaining a good image quality of a video obtained by extracting a part of a captured video even in a case in which a position of the extracted region is changed.The video creation method according to an embodiment of the present invention includes a setting step of setting, in an imaging region of a first video having a first angle of view, a plurality of regions having a second angle of view smaller than the first angle of view, a designation step of designating, out of a first region and a second region included in the plurality of regions, the second region having a smaller appropriate exposure amount than the first region as a reference region, and a condition determination step of determining at least one condition of an exposure time in a case in which the first video is captured or a stop amount for an incidence ray on the imaging lens based on the appropriate exposure amount of the reference region.