Image Capturing Device Subject Movement Detection
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Solution Overview
Problem
Existing image capturing devices often erroneously trigger automatic image capture due to environmental changes, such as fluctuations in brightness, which can be misinterpreted as subject movement, leading to incorrect detection and capture.
Innovation Solution
The device employs a method to differentiate between subject movement and environmental changes by calculating and comparing difference values between frame images, using a threshold value to prevent erroneous automatic image capture, and displaying a warning to the user when conditions are not suitable for accurate detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If automatic image capture is triggered based on pixel value changes in the auto shutter area, then subject movement detection is achieved, but environmental changes like brightness fluctuations are erroneously detected as subject movement
Solution Approach 1:
The patent divides the image into the auto shutter area and non-auto shutter area, and further segments the analysis by comparing pixel value changes between consecutive frames only within the auto shutter area. This segmentation allows the system to focus detection on the relevant region while filtering out environmental changes in other areas.
Solution Approach 2:
The patent applies different detection criteria to different regions: pixel value change detection is applied specifically to the auto shutter area, while the non-auto shutter area is excluded from this detection. This local quality approach ensures that environmental changes in the entire image are not mistakenly interpreted as subject movement in the auto shutter area.
2Productivity
If pixel value changes are used to detect subject movement, then automatic image capture timing is improved, but false triggers occur due to environmental fluctuations
Solution Approach 1:
The patent performs preliminary detection by first identifying whether the auto shutter area is located in the non-light-receiving portion of the image before applying pixel value change detection. This preliminary action prevents false triggers by excluding areas that are unlikely to contain subjects from the detection process.
Solution Approach 2:
The patent introduces an intermediary judgment step: before triggering automatic image capture based on pixel value changes, the system first determines whether the auto shutter area corresponds to the non-light-receiving portion. This intermediary check acts as a filter to prevent environmental fluctuations from causing false triggers.
Data Source
Figure 1A~1C
Figure 2
Figure 3
AI summary
A control unit (22) monitors a state of captured image sequentially outputted by an image capturing unit (11-18). The control unit (22) carries out a first determination that determines whether or not the state of a captured image satisfies a prescribed condition. When the result is that the prescribed condition is satisfied, the captured image is recorded in a recording unit (28). The control unit (22) also carries out a second determination that determines whether or not the state of the captured image is appropriate for being subjected to the first determination. When the result is that the state is not appropriate for being subjected to the first determination, a warning is issued to the user to this effect.