Adaptive Exposure Bracketing for Single-Take HDR Video Capture
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Solution Overview
Problem
Existing image capturing technologies in single take mode fail to adaptively change exposure values, limiting the application of multi-frame composition techniques like HDR, and existing methods for extracting key frames from videos are resource-intensive and result in quality differences between photo and video captures.
Innovation Solution
An electronic device with a camera and sensor configures multiple exposure values based on the image capturing environment, alternately applies these values to acquire frames, and generates high-quality videos or images using HDR, optimizing the image capturing process to enhance quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If single take mode is used to capture photos and videos simultaneously, then capturing speed is improved, but exposure value adaptation is lost and multi-frame composition cannot be applied
Solution Approach 1:
The patent segments the video capture process into multiple exposure bracketed frames, capturing images at different exposure values during the video recording. This allows the system to maintain high capturing speed while enabling post-processing multi-frame composition for enhanced image quality.
Solution Approach 2:
The patent performs preliminary exposure bracketing during video capture by pre-configuring multiple exposure values and capturing frames at each exposure level. This preliminary action enables subsequent HDR composition without requiring real-time exposure adjustment, maintaining capture speed while improving adaptability.
2Adaptability or versatility
If auto exposure bracketing is used to obtain multiple exposure frames, then multi-frame composition capability is improved, but the number of obtainable frames is limited
Solution Approach 1:
The patent implements periodic exposure bracketing during video capture, where the camera alternates between different exposure values in a periodic manner throughout the video recording. This periodic action increases the number of obtainable frames compared to traditional AEB, enabling more comprehensive multi-frame composition.
Solution Approach 2:
The patent maintains continuous exposure bracketing throughout the entire video capture process, ensuring that multiple exposure frames are continuously obtained during video recording. This continuous action maximizes the quantity of usable frames for HDR composition while maintaining adaptability.
3Ease of operation
If key-frame extraction is performed on encoded video frames, then photo extraction capability is improved, but resource consumption increases and quality differs from photo mode
Solution Approach 1:
The patent performs preliminary exposure bracketing during video capture, capturing multiple exposure frames before any decoding or analysis is required. This preliminary action enables direct extraction of high-quality frames for photo mode without requiring subsequent decoding and analysis, significantly reducing resource consumption while maintaining or improving quality.
Solution Approach 2:
The patent creates multiple copies of the scene at different exposure values during video capture. These exposure-bracketed frames serve as ready-to-use photo candidates, eliminating the need to decode and analyze encoded video frames for photo extraction, thereby reducing computational resources required.
Data Source
AI summary
An example electronic device includes a camera which can set a plurality of exposure values; a sensor for detecting an image capturing environment of the electronic device; and at least one processor electrically connected to the camera and the sensor, wherein the at least one processor is configured to: obtain information about the image capturing environment through the sensor; set two or more exposure values among the plurality of exposure values on the basis of the obtained information about the image capturing environment; obtain frames to which the two or more set exposure values are alternately applied; and generate a video file on the basis of the obtained frames.