Dynamic Angle of View Control for Subject Detection
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Solution Overview
Problem
Existing imaging systems face difficulties in efficiently detecting subjects, particularly faces, at varying distances due to limitations in the angle of view, which affects the detection range and accuracy, leading to inefficient automatic imaging operations.
Innovation Solution
An imaging control device and method that dynamically adjusts the angle of view by using a zoom lens driving mechanism and pan/tilt mechanisms to change the imaging field, allowing for repeated subject detection processing when initial attempts fail, utilizing imaging history information to optimize zoom settings for improved detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the zoom lens is set to the wide end to expand the search range, then the horizontal and vertical detection range is improved, but the detectable range in the depth direction becomes narrow
Solution Approach 1:
The patent applies dynamics by making the zoom lens magnification adjustable rather than fixed. The system dynamically changes the zoom level based on detection needs: using wide-angle settings for initial broad search and then switching to telephoto settings for accurate face detection at distance, thus resolving the contradiction between search range and detection accuracy
Solution Approach 2:
The patent changes the optical parameter (zoom magnification) from a static setting to a variable parameter. By adjusting the zoom level between wide and telephoto based on the detection phase and subject distance, the system optimizes both the search range coverage and the face detection accuracy, eliminating the trade-off between these two requirements
2Area of stationary object
If the zoom lens is set to the wide end to search in a wide range, then the coverage area is improved, but the distance to subject becomes short limiting effective detection
Solution Approach 1:
The system dynamically adjusts the zoom magnification based on the detection phase. During the initial search phase, it uses wide-angle to cover large areas, then transitions to telephoto mode when switching to face detection, thereby maintaining both wide coverage capability and extended detection distance as needed
Solution Approach 2:
The detection process is segmented into distinct phases: a broad search phase using wide-angle zoom to cover large areas, followed by a focused detection phase using telephoto zoom for distant subjects. This segmentation allows each phase to use the optimal zoom setting, resolving the contradiction between coverage area and detection distance
3Productivity
If face detection is performed in a wide imaging field of view, then the search efficiency is improved, but the recognition accuracy becomes insufficient for distant subjects
Solution Approach 1:
The patent implements dynamic zoom adjustment where the magnification level changes based on the detection task. The system starts with wide-angle for efficient broad search, then dynamically switches to telephoto when face detection is required, ensuring both search efficiency and recognition accuracy are optimized for their respective purposes
Solution Approach 2:
The system performs preliminary broad search using wide-angle to identify potential subject areas, then prepares for accurate face detection by switching to telephoto mode. This preliminary action phase separates the search function from the detection function, allowing each to operate at optimal performance levels
Data Source
AI summary
An imaging control device for an imaging apparatus or an imaging system having an imaging section which performs imaging of a subject and an imaging field changing section of the imaging section, includes: a determination section which determines whether or not a subject detecting section detects a predetermined target subject by analyzing a captured image signal acquired by the imaging section, in a subject detection processing; and an imaging field change control section which controls the imaging field changing section to change an angle of view in the imaging section, wherein when the determination section determines that the subject detecting section does not detect a target subject in the subject detection processing, the imaging field change control section controls the imaging field changing section to change the angle of view in the imaging section and then the image control device controls the subject detecting section to perform the subject detection processing.