Image Capture Focus Tracking with Dynamic Detection Areas
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Solution Overview
Problem
Existing image capture systems struggle with maintaining focus on moving subjects, particularly when the target subject area is no longer detected or its reliability is low, necessitating manual adjustments like panning shots to keep the subject within the focus detection area.
Innovation Solution
An image capture apparatus with processors that detect a subject area, obtain distances, and enlarge the focus detection area when the subject is not detected or its reliability is low, based on previously obtained distances, and also adjust the focus detection area based on the motion of the apparatus during framing actions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the focus detection area is kept small to maintain measurement precision, then focus detection accuracy is improved, but the subject may fall outside the detection area when moving
Solution Approach 1:
The focus detection area dynamically changes size based on detection reliability. When subject detection reliability is low or the subject moves out of the current focus detection area, the area is automatically enlarged to maintain tracking capability while preserving precision when conditions allow
Solution Approach 2:
The system changes the parameter of focus detection area size based on detection conditions. By monitoring subject detection reliability and movement, the system adjusts the area size to optimize both precision and adaptability to moving subjects
2Reliability
If manual panning operations are required to track moving subjects, then focus tracking can be maintained, but operational complexity and difficulty increase
Solution Approach 1:
The system performs automatic focus detection area adjustment without requiring manual panning operations. The enlargement unit automatically enlarges the focus detection area when subjects move out or detection reliability drops, making the system self-adjusting and eliminating the need for complex manual tracking operations
3Reliability
If the focus detection area is enlarged to capture moving subjects, then subject tracking reliability is improved, but focus detection precision may deteriorate
Solution Approach 1:
The focus detection area size is dynamically adjusted rather than fixed. The system enlarges the area only when necessary (when subject detection reliability is low or subject moves out), and maintains normal size when detection conditions are good, thus balancing reliability and precision
Data Source
AI summary
An image capture apparatus detects a subject area from an image that has been shot and enlarges a focus detection area in a case where the subject area is not detected or a reliability that the detected subject area corresponds to an intended subject is determined to be low. The image capture apparatus enlarges the focus detection area based on the distances previously obtained by the obtainment unit.