Vibration Detection Apparatus Dynamic Range Adjustment
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Solution Overview
Problem
In panning shooting, especially with slow-moving subjects, the low panning speed results in small angular velocity outputs, leading to decreased differences between subject and background vectors, causing inaccurate detection of subject vectors and difficulties in image stabilization.
Innovation Solution
A vibration detection apparatus that extracts motion vectors outside a range determined by the angular velocity, with a narrower range set when angular velocity is below a threshold, to improve the accuracy of subject vector detection and image stabilization by adjusting the correction amount based on the average vector value and angular velocity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed range based on angular velocity is used to detect subject vectors, then the detection method is simple, but the detection accuracy decreases when angular velocity is low
Solution Approach 1:
The patent applies dynamics by making the detection range variable rather than fixed. The extraction unit dynamically adjusts the range based on the angular velocity value - using a first (narrower) range when angular velocity is below the threshold and a second (wider) range when it is above the threshold. This dynamic adaptation allows the system to maintain high detection accuracy across varying panning speeds without requiring complex manual configuration.
Solution Approach 2:
The patent changes the parameter of detection range based on the angular velocity parameter. By setting different range values according to whether the angular velocity is below or above a threshold, the system optimizes subject vector detection for different panning conditions. This parameter change approach resolves the contradiction by adapting the detection characteristics to the current operating state.
2Measurement precision
If a wide detection range is used, then all motion vectors are captured, but subject vectors cannot be distinguished from background vectors when angular velocity is low
Solution Approach 1:
The patent applies local quality by making the detection range dependent on the local condition of angular velocity. Instead of using a uniform wide range for all cases, the system applies a narrower first range specifically when angular velocity is low, and a wider second range when angular velocity is high. This localized adaptation to different operating conditions enables accurate subject-background vector discrimination in low angular velocity scenarios while maintaining comprehensive vector capture in high angular velocity scenarios.
3Measurement precision
If a narrow detection range is used, then subject vectors are accurately detected in low angular velocity cases, but vectors outside the range are missed
Solution Approach 1:
The patent resolves this information loss issue through dynamic range selection. The extraction unit automatically switches between a narrow first range (when angular velocity is below threshold) and a wide second range (when angular velocity is above threshold). This dynamic behavior ensures that the appropriate amount of information is captured for each specific condition, preventing both information loss in high-velocity cases and false detections in low-velocity cases.
Data Source
AI summary
A vibration detection apparatus comprising: an extraction unit that extracts, from among a plurality of motion vectors obtained from a difference between frames of images output from an image sensor for predetermined regions set in the images, motion vectors that exist outside a range determined based on an angular velocity of vibration, as subject vectors, and outputs an average value of the extracted subject vectors; and an acquisition unit that obtains, in panning shooting, a correction amount of a correction unit based on the average value and the angular velocity in a case where the subject vectors were extracted. The extraction unit sets the range narrower in a case where the angular velocity is less than a predetermined threshold value than in a case where the angular velocity is greater than or equal to the threshold value.