Focus Lens Drive Selection for Continuous AF Tracking
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Solution Overview
Problem
Existing imaging technologies struggle to perform appropriate focusing control during continuous imaging, especially when there are changes in the movement of the subject or the imaging apparatus, leading to difficulties in tracking the focusing position due to subject movement.
Innovation Solution
A focusing control device and method that predicts lens driving times and selects appropriate driving methods based on time-series AF information, using temporary or main predictions to adjust focus lens movements accordingly, ensuring accurate focusing even with subject or apparatus movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focus lens is moved to adjust focusing position, then focusing accuracy is improved, but the response time to track moving subjects deteriorates
Solution Approach 1:
The system performs preliminary actions by predicting the target focusing position in advance based on time-series AF information before the subject moves further away. The processor calculates the predicted focusing position using past AF data, allowing the focus lens to be positioned proactively rather than reactively, thus maintaining both accuracy and speed in tracking moving subjects
Solution Approach 2:
The system dynamically adapts the driving method of the focus lens based on the predicted lens driving time. When the predicted driving time exceeds a threshold, the system switches to a first driving method that prioritizes timing, and when it is within the threshold, it uses a second driving method that prioritizes accuracy. This dynamic adjustment allows the system to optimize between speed and accuracy based on real-time conditions
2Measurement precision
If the lens driving time is extended to ensure accurate focusing, then focusing precision is improved, but the ability to track fast-moving subjects deteriorates
Solution Approach 1:
The system performs preliminary prediction of the target focusing position using time-series AF information before the actual focusing operation is needed. By calculating the predicted position in advance based on past AF data, the system reduces the actual lens driving time required while maintaining focusing precision, thus preventing loss of tracking time for fast-moving subjects
Solution Approach 2:
The system changes the driving parameters of the focus lens based on the predicted lens driving time. When the predicted time exceeds a threshold, the system adjusts to a first driving method with different parameters optimized for speed, and when it is within the threshold, it uses a second driving method with parameters optimized for precision. This parameter adaptation allows the system to maintain both precision and tracking capability
Data Source
AI summary
There is provided a focusing control device that performs focusing control in each frame period of imaging, the focusing control device comprising: a processor, in which the processor is configured to: predict, in an N-th frame period, a lens driving time for moving a focus lens to a first target focusing position in an (N+1)-th frame period based on first time-series AF information in which AF information obtained in an (N−1)-th frame period is included; and select a driving method of the focus lens that is to be executed in the N-th frame period based on the predicted lens driving time.