Imaging Focus Control with Predictive Distance Tracking
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Solution Overview
Problem
Existing imaging systems struggle to accurately track a subject's focus position, particularly when the subject moves or obstacles interfere, leading to rear or front focusing errors.
Innovation Solution
A control device and method that predicts distance information between the imaging apparatus and a subject in subsequent frames based on image data from previous frames, dynamically adjusting the settable range of the focus position to improve tracking by setting a focus position that accounts for subject movement and obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focus position is adjusted based on phase difference amount, then the focusing accuracy is improved, but the tracking performance deteriorates when the subject moves or obstacles interfere
Solution Approach 1:
The system performs preliminary actions by predicting the future distance to the moving subject based on past distance information before actual focusing occurs. This allows the focus position to be pre-adjusted according to the predicted subject position, ensuring accurate tracking even when the subject moves or obstacles appear. The prediction mechanism proactively compensates for subject movement rather than reactively adjusting after focus errors occur.
2Adaptability or versatility
If the focus tracking range is expanded to accommodate subject movement, then the tracking capability is improved, but the focusing precision deteriorates due to increased range
Solution Approach 1:
The system dynamically adjusts the focus position prediction based on the actual movement patterns of the subject. The prediction mechanism adapts to different subject speeds and movement directions, optimizing the focus tracking range in real-time. This allows the system to maintain appropriate precision while accommodating subject movement, as the range expansion is precisely controlled based on predicted rather than maximum possible movement.
3Speed
If the focus position is set based on current frame data only, then the response speed is improved, but the tracking accuracy deteriorates due to lag when subject moves
Solution Approach 1:
The system performs preliminary focus positioning by predicting where the subject will be in the current frame based on past distance information from previous frames. This predictive approach eliminates the lag inherent in reactive focusing systems, as the focus position is pre-calculated based on subject movement trends rather than waiting for focus errors to manifest. The system responds proactively to subject movement while maintaining accuracy.
Data Source
AI summary
A control device controls an imaging apparatus and includes a processor, and the processor is configured to: based on image data of a first frame and image data of a second frame among a plurality of frames obtained by the imaging apparatus, predict distance information related to a distance between the imaging apparatus and a subject in a third frame subsequent to the first frame and the second frame; and based on a state of the subject, set a settable range that is a range of a focus position of imaging of the imaging apparatus settable for the third frame.