Camera Focus Judgment Mechanism for Moving Subjects
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Solution Overview
Problem
Conventional cameras with automatic focus adjustment (AF control) struggle to maintain focus on a subject when the subject or camera moves between the focusing instruction and the photographing instruction, leading to the subject becoming out of focus in the final image.
Innovation Solution
A photographing apparatus and focusing control method that includes a focusing instruction device, a focusing control device, a photographing instruction device, a focusing judgment device, and a photographing control device, which assesses the focus position at the time of the focusing instruction and adjusts focus as needed before executing the photographing instruction to ensure the subject remains in focus.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If AF control is performed only at the time of focusing instruction, then the processing is simple, but the subject becomes out of focus when it moves before photographing
Solution Approach 1:
The patent performs a preliminary judgment of whether the subject has moved between focusing instruction and photographing instruction. Based on this preliminary assessment, the system decides whether to execute additional AF control. This preliminary action prevents unnecessary processing while ensuring focus accuracy when needed.
Solution Approach 2:
The patent introduces a feedback mechanism where the system monitors subject position changes and uses this information to determine whether re-execution of AF control is necessary. The focusing judgment device provides feedback about subject movement, which triggers appropriate corrective action to maintain focus accuracy.
2Reliability
If AF control is re-executed before photographing, then the subject remains in focus even if it moves, but the processing becomes complicated
Solution Approach 1:
The system performs a preliminary judgment about subject movement before deciding to re-execute AF control. This preliminary assessment avoids unnecessary re-execution of focusing operations, maintaining simplicity while ensuring accuracy when the subject has actually moved.
Solution Approach 2:
The focusing judgment device provides feedback about whether the subject has moved, enabling the system to make intelligent decisions about whether to re-execute AF control. This feedback-based approach ensures focusing accuracy is maintained only when necessary, avoiding unnecessary processing complexity.
3Speed
If two types of focusing devices are combined to follow subject changes, then high-speed focusing is achieved, but the AF control processing becomes complicated
Solution Approach 1:
The patent performs a preliminary judgment about subject movement before deciding whether to re-execute AF control. This preliminary assessment allows the system to maintain simple processing by avoiding unnecessary operations, while still achieving accurate focus tracking when the subject moves.
Solution Approach 2:
The system uses feedback from the focusing judgment device to determine when AF control needs to be re-executed. This feedback mechanism enables the system to achieve accurate subject tracking with simple processing logic, avoiding the complexity of combining multiple focusing devices while maintaining high-speed focusing capability.
Data Source
AI summary
A photographing apparatus comprises: a photographing device which takes an image of a subject; a focusing control device which controls the focusing status of the photographing device in response to an input of a focusing instruction; a focusing judgment device which, upon an input of the photographing instruction after the input of the focusing instruction, judges whether or not a focus position at the time of the input of the focusing instruction is optimum; and a photographing control device which controls to execute photographing using the focus position as it is if the focus position at the time of the input of the focusing instruction is judged to be optimum, and controls to execute photographing after performing focusing control again if the focus position is judged to be not optimum.