Focusing Lens Shake Correction via Acceleration Data
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Solution Overview
Problem
Conventional technologies for correcting shake in the optical axis direction only perform shake correction when the cumulative time of focus detection exceeds a predetermined value, limiting the effectiveness of shake compensation during image capture.
Innovation Solution
A calculation device that calculates the amount of movement of a focusing lens based on both deviation information from focus detection and shake information from an acceleration detection device, allowing for continuous adjustment of the focal position to compensate for shake, even at shorter intervals than traditional methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shake correction is performed only when cumulative focus detection time exceeds a predetermined value, then the system operates simpler with lower processing load, but shake correction effectiveness is reduced during image capture
Solution Approach 1:
The system performs preliminary calculations using shake information at short intervals between focus detection inputs, preparing correction data in advance. This allows the focusing lens to be adjusted continuously based on predicted shake movements, improving correction effectiveness without waiting for focus detection cycles
Solution Approach 2:
The calculation unit acts as an intermediary that processes shake information from the acceleration detection device and combines it with focus detection information. This intermediary processing enables continuous shake correction by interpolating movement amounts between focus detection moments, bridging the gap between discrete focus detection events and continuous shake compensation needs
2Measurement precision
If focus detection imaging is performed frequently to improve focus tracking accuracy, then focus tracking accuracy improves, but the processing load and energy consumption increase
Solution Approach 1:
The system replaces frequent mechanical/optical focus detection operations with computational processing of acceleration data. By using the acceleration detection device to calculate focusing lens movement amounts between focus detection events, the system achieves continuous focus tracking without the energy cost of frequent imaging operations
Solution Approach 2:
The system uses its own acceleration detection capability to self-correct focusing errors between focus detection events. The calculation unit leverages already-acquired shake information to determine correction amounts, making the system self-sufficient for continuous focus maintenance without external energy-intensive operations
Data Source
AI summary
A calculation device calculating an amount of movement in an optical axis direction of a focusing lens which adjusts a focal position of an imaging optical system includes: a first input unit to which first information about a deviation between an imaging surface which captures an image by the imaging optical system and the focal position is repeatedly input; a second input unit to which second information about a shake of the imaging optical system in the optical axis direction is repeatedly input at intervals shorter than those of the first information; and a calculation unit which calculates the amount of movement on the basis of at least one of the first information and the second information, wherein the calculation unit calculates the amount of movement on the basis of the second information between an input of the first information and an input of the next first information.