Digital Camera Aperture Control for Multi-Face Focus
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Solution Overview
Problem
Digital cameras often capture unfocused images when multiple people are in a photograph due to varying focus based on the aperture value set by the user, leading to blurred photos of some subjects being focused while others are not.
Innovation Solution
A digital photographing apparatus and control method that detect multiple face regions, calculate distances to these faces, and automatically adjust the aperture value to ensure all faces are in focus, enabling depth expression by comparing depth values and changing the aperture accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed aperture value is used for photographing, then the device complexity is reduced and operation is simplified, but the manufacturing precision of focus across multiple subjects at different depths deteriorates
Solution Approach 1:
The patent implements dynamic aperture value adjustment based on detected face depths. The system automatically changes the aperture value from a fixed predetermined value to a dynamically calculated value that ensures all faces within the scene are in focus, resolving the contradiction between operational simplicity and focus precision for multiple subjects.
Solution Approach 2:
The system changes the aperture value parameter based on depth information of detected faces. By calculating the required aperture value to achieve adequate depth of field covering all face depths and notifying the user of this changed parameter, the system maintains focus precision while keeping operation simple through automation.
2Manufacturing precision
If the aperture value is automatically changed to focus on all faces, then the focus precision for multiple subjects is improved, but the device complexity increases due to additional detection and calculation functions
Solution Approach 1:
The system performs self-service by automatically detecting face regions, calculating depths, determining the required aperture value, and notifying the user without requiring external intervention or complex manual adjustments. This automation reduces the perceived complexity for the user while achieving precise focus.
Solution Approach 2:
The system uses feedback from face detection and depth calculation to determine the appropriate aperture value. By continuously monitoring face positions and adjusting the aperture value accordingly, the system achieves precise focus control through a closed-loop control mechanism that manages complexity internally.
3Manufacturing precision
If face detection and depth calculation are performed for all detected faces, then the focus precision is improved, but the processing time increases
Solution Approach 1:
The system extracts only the essential information needed for focus control - specifically face regions and their depths - rather than processing all image data. By focusing calculations only on detected face regions and their depth values, the system achieves precise focus control with minimized processing time.
4Manufacturing precision
If the aperture value is adjusted to capture all faces in focus, then the quality of photographing is improved, but the depth expression capability deteriorates
Solution Approach 1:
The system dynamically adjusts the aperture value based on the specific scene and face depths rather than using a fixed value. This dynamic adjustment optimizes the balance between achieving all faces in focus and maintaining adequate depth expression, allowing the system to adapt to different shooting scenarios.
Data Source
AI summary
Embodiments include a digital photographing apparatus and a control method thereof. The digital photographing apparatus detects two or more face regions from an input image, calculates an aperture value for focusing on all face regions to notify a user of the calculated value, and photographs all focused faces by automatically changing the aperture value, when the subject to be photographed is a plurality of persons.