Digital Camera Face Detection Subsystem Stability
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Solution Overview
Problem
Conventional face-detecting devices in digital cameras intermittently fail to detect human faces due to movement or orientation, leading to fluctuating frame displays and unclear images when the shutter is released without proper focus and exposure adjustments.
Innovation Solution
A digital camera system with a detection processor and two determination processors that conducts repetitive face detection and re-determines a substitute area as the designated area if the original area is not detected, ensuring continuous display of a frame on the monitor and maintaining focus and exposure adjustments on the latest detected face area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repetitive detection processes are conducted to detect moving face areas, then the accuracy of face detection is improved, but the frame display fluctuates and causes user discomfort when detection fails
Solution Approach 1:
The system stores the latest detected face area information in advance before it becomes unavailable. When detection temporarily fails, the pre-stored face area data is used to maintain continuous frame display, preventing display fluctuation and user discomfort while preserving detection accuracy.
Solution Approach 2:
The face area storage unit acts as an intermediary between the detection processor and display processor. It buffers face area information, ensuring that the display processor always has valid data to work with, even when detection temporarily fails, thus mediating between detection accuracy requirements and display stability requirements.
2Productivity
If the shutter is released when face area is not detected, then photographing can proceed without delay, but the focus and exposure adjustment is conducted without face area information resulting in unclear images
Solution Approach 1:
The system performs focus and exposure adjustment in advance using the stored face area information before the shutter is released. This preliminary adjustment ensures that even if detection fails at the moment of shooting, the image quality parameters have already been optimized based on previously detected face areas.
Solution Approach 2:
The stored face area information maintains the continuity of useful action by providing uninterrupted data for focus and exposure adjustment. The system continuously uses the latest available face area data to guide adjustment processes, ensuring image quality is maintained even during temporary detection gaps.
3Measurement precision
If the detection process is repeated frequently to track moving faces, then the frame can follow the moving face accurately, but the detection may fail intermittently due to face size or orientation changes
Solution Approach 1:
The system prepares backup face area information in advance by continuously storing detection results. When detection temporarily fails due to face movement or orientation changes, this pre-prepared information cushions against detection gaps, maintaining detection consistency without reducing the frequency of detection attempts.
Data Source
AI summary
A photographing device for photographing an object in a photographing area has a detection processor, and first and second determination processors. The detection processor conducts repetitive detection processes for detecting a specific area where a specific object appears in the photographing area. The first determination processor determines the detected specific area to be a designated area. The second determination processor re-determines a substitute area including the detected specific area that has been latest detected by the detection processor to be the designated area if the specific area is not detected in the detection process.