Dynamic Subject Weighting for Camera Tracking Stability
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Solution Overview
Problem
Conventional methods for aligning and tracking subjects during photography face challenges with fast-moving subjects, particularly when multiple subjects are present, leading to incorrect subject selection and exposure fluctuations.
Innovation Solution
An apparatus and method that sets a predetermined margin range around a focus detection frame, allowing the main subject to be maintained as a detection target even when it moves outside the frame, while updating the target subject based on specific weighting settings and exposure control, ensuring the intended subject is focused and exposed correctly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a fixed focus detection frame is used for shooting, then the user can easily adjust a stationary subject to the frame, but when the subject moves fast, it is difficult to align the fixed frame with the subject
Solution Approach 1:
The patent implements a dynamic focus detection frame that can automatically track and align with moving subjects. The system transitions from a static fixed frame to a dynamic frame that moves with the subject, allowing the user to easily capture fast-moving subjects without manual realignment. The frame dynamically adjusts its position based on subject detection algorithms.
2Speed
If a tracking function automatically aligns the frame to the main subject, then fast-moving subjects can be captured, but when multiple subjects are present, the wrong subject may be selected as the main subject
Solution Approach 1:
The patent applies local quality by creating a weighted focus detection frame with different weighting regions. The center region has higher weight than peripheral regions, allowing the system to preferentially select subjects in the central area when multiple subjects are detected. This weighted approach enables accurate subject selection by emphasizing the locally important central region while still detecting multiple subjects throughout the frame.
3Adaptability or versatility
If the entire screen is set as the detection target, then all subjects are detected, but the subject at the end of the screen may be selected instead of the desired subject near the center
Solution Approach 1:
The patent implements local quality by assigning different weights to different regions of the detection frame. The central region is given higher weight while peripheral regions have lower weight. This allows the system to maintain full-screen detection capability while preferentially selecting subjects in the central region, thus resolving the conflict between comprehensive detection and accurate subject selection.
4Reliability
If a second area is set around the reference point to maintain tracking when the subject moves outside the first area, then the subject can be tracked during movement, but exposure fluctuation may occur due to frequent tracking target changes
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the weighting parameters of the focus detection frame based on subject position and movement. When a subject moves from the center to peripheral areas, the system modifies the weight distribution to maintain continuous tracking while preventing exposure fluctuations. This dynamic parameter adjustment ensures both tracking reliability and exposure stability.
Data Source
AI summary
An apparatus sets a weighting of a first subject included in a predetermined first range to be larger than that of other subjects when a detected subject is included in a first range in an image, updates a target subject for the photometry of which the weighting is set to be larger after continuing a state where the weighting of the first subject is set to be larger for a predetermined time when the first subject goes out of a second range which is wider than the first range and when the first subject does not go out of a third range which is wider than the second range, and updates the target subject for the photometry of which the weighting is set to be larger in response that the first subject goes out of the third range.