Optical Device Focus Detection Point Selection via Line of Sight
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Solution Overview
Problem
Existing optical devices face challenges in accurately selecting a focus detection point due to erroneous detection based on object size, color, and brightness, and variability in line of sight detection among individuals, leading to difficulties in reflecting the photographer's intention for focus point selection.
Innovation Solution
An optical device with multiple focus detection points that includes a first detection unit for object images, a second detection unit for user line of sight, a mode selection unit, and a priority determination unit to determine the focus detection point based on selected photographing modes, ensuring user intention is reflected in focus point selection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If object detection function is used to select ranging point, then ranging point selection is automated, but erroneous detection occurs depending on object size, color, and brightness
Solution Approach 1:
The patent introduces a sight line detection function as an intermediary mechanism to mediate between automatic object detection and manual ranging point selection. When object detection fails or produces erroneous results, the system uses sight line detection to determine the observer's intended target, thereby resolving the contradiction between automation and accuracy by providing a fallback mechanism that reflects user intention.
2Ease of operation
If sight line detection function is used to select ranging point, then ranging point selection reflects user intention, but detection accuracy varies among individual observers
Solution Approach 1:
The patent implements a dynamic switching mechanism that allows the system to flexibly transition between object detection mode and sight line detection mode based on detection results and user input. This dynamic approach enables the system to adapt to different observation conditions and individual user characteristics, maintaining high accuracy across varied scenarios by selecting the most appropriate detection method.
3Adaptability or versatility
If multiple detection functions are combined, then ranging point selection comprehensiveness is improved, but device complexity increases
Solution Approach 1:
The patent integrates multiple detection functions (object detection and sight line detection) into a unified ranging point selection system that serves multiple purposes. The same detection mechanisms are used across different photographing modes (automatic, sight line detection mode, manual setting mode), reducing the need for separate specialized systems and managing complexity through multi-functional design.
4Measurement precision
If touch panel is used for ranging point selection, then manual selection precision is improved, but user operation convenience deteriorates due to line of sight movement requirement
Solution Approach 1:
The patent implements feedback mechanisms where the system continuously monitors both sight line position and touch input, providing real-time confirmation and adjustment capabilities. The sight line detection provides feedback on the current target, while touch input allows precise adjustment, and the system provides visual feedback on the selected ranging point, creating a closed-loop interaction that improves both precision and convenience.
Data Source
AI summary
An optical device capable of selecting a focus detection point from a plurality of focus detection points for focus detection, such that the selection is performed while causing a user's intention to be reflected thereon. The optical device performs focus detection at a focus detection point selected from focus detection points in a predetermined photographing range. A face area is detected from an object image in the photographing range. The line of sight of a user is detected in the photographing range. A photographing mode is selected from a plurality of photographing modes. The priorities of face detection and sight line detection are determined according to the selected photographing mode. A focus detection point at which the focus detection is performed is determined according to the priorities.