Auto Exposure Correction Range Limiting in High-Speed Continuous Shooting
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Solution Overview
Problem
In high-speed continuous shooting mode, cameras often set inappropriate exposure values due to large absolute exposure correction values, leading to unintended image exposure, as they fail to maintain proper auto exposure control when correction values exceed predetermined limits.
Innovation Solution
The digital camera implements a controller that determines whether the exposure correction value is within a predetermined range (e.g., -3 EV to +3 EV) and only performs auto exposure control when it is, thereby limiting exposure corrections to prevent inappropriate exposure settings during high-speed continuous shooting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If auto exposure control is performed during high-speed continuous shooting mode, then exposure settings are automatically adjusted, but inappropriate exposure values are set when large absolute exposure correction values are applied
Solution Approach 1:
The patent changes the parameter of exposure correction value range by introducing a predetermined range (e.g., -3 EV to +3 EV) as a threshold. When the absolute value of exposure correction exceeds this range, the auto exposure control is inhibited, thereby preventing inappropriate exposure settings while maintaining automated exposure adjustment within acceptable limits
2Adaptability or versatility
If exposure correction value is allowed to be large, then user can correct exposure significantly, but auto exposure control becomes unreliable and sets unintended exposure values
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the exposure correction value and compares it against the predetermined range. When the correction value exceeds the range, the system provides feedback by inhibiting auto exposure control, thereby maintaining reliability while allowing flexible user correction within acceptable limits
3Reliability
If auto exposure control is inhibited when exposure correction value exceeds predetermined range, then inappropriate exposure settings are prevented, but automated exposure adjustment is limited
Solution Approach 1:
The patent defines a predetermined range parameter (e.g., -3 EV to +3 EV) that serves as a threshold for auto exposure control. Within this range, automated exposure adjustment operates normally; when the correction value exceeds this parameter threshold, automation is inhibited. This parameter-based approach balances reliability with automated control functionality
Data Source
AI summary
An imaging apparatus includes an imager, an operator, and a controller. The operator sets an exposure correction value and a continuous shooting mode including a first continuous shooting mode and a second continuous shooting mode in which continuous shooting is performed at a higher speed than in the first continuous shooting mode. The controller is configured to determine whether the exposure correction value is within a predetermined range when the second continuous shooting mode is set in the operator. The controller is configured to perform the auto exposure control during continuous shooting operation in the second continuous shooting mode when determined that the exposure correction value is within the predetermined range. The controller is configured not to perform the auto exposure control during the continuous shooting operation in the second continuous shooting mode when determined that the exposure correction value is not within the predetermined range.