Range Finder Shake Correction via Distance Variation Detection
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Solution Overview
Problem
Existing image shake prevention devices in optical instruments drive correcting lenses even during intended user panning, leading to impaired object trackability and potential failure to capture the object in sight.
Innovation Solution
A distance detection device with a calculating unit, first and second detecting units, and a shake correcting optical system that uses outputs from these units to control the driving of the shake correcting optical system, distinguishing between intended panning and unintended shake to adjust the cut-off frequency and bias coefficients for effective shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the shake correcting optical system is driven based on gyro sensor output, then image shake is prevented, but intended panning operations are incorrectly corrected causing loss of object trackability
Solution Approach 1:
The system dynamically adjusts the cut-off frequency of the low-pass filter based on detected distance variations. When the subject distance changes beyond a threshold, the cut-off frequency is reduced to allow panning movements to pass through without correction. This dynamic parameter adjustment enables the system to adapt between shake correction mode and panning follow mode, resolving the contradiction between preventing image shake and maintaining object trackability.
Solution Approach 2:
The invention changes the frequency parameter of the shake correction system based on distance variation detection. By modifying the cut-off frequency threshold according to whether subject distance is stable or changing, the system switches between correcting all angular movements and allowing intentional panning, thus resolving the conflict between shake prevention reliability and operational ease.
2Reliability
If the shake correcting optical system is driven continuously, then image stability is maintained, but power consumption increases and system complexity grows
Solution Approach 1:
The system performs periodic distance measurements using time-of-flight calculation and compares successive distance values to detect changes. Based on this periodic detection, the shake correction is selectively activated or deactivated. This periodic monitoring approach maintains image stability when needed while reducing power consumption by avoiding continuous full-power correction operation.
Solution Approach 2:
The system uses feedback from distance measurement results to control the shake correction operation. When distance variation exceeds the threshold, feedback signals the system to reduce cut-off frequency and modify correction behavior. This feedback mechanism ensures image stability is maintained only when necessary, reducing unnecessary power consumption during panning operations.
3Reliability
If the cut-off frequency is kept low for shake correction, then high-frequency vibrations are filtered, but intended panning movements are also suppressed
Solution Approach 1:
The cut-off frequency is dynamically adjusted based on distance variation detection. When the subject distance is stable, a low cut-off frequency provides effective shake correction. When distance changes indicate panning intent, the cut-off frequency is reduced further or correction is modified to allow the panning movement to pass through. This dynamic adjustment enables the system to adapt its frequency response to different user intentions, resolving the contradiction between shake correction effectiveness and adaptability to user intent.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively prevents image shake while allowing intended panning operations, ensuring accurate object tracking and capture by dynamically adjusting parameters based on distance and angular speed variations.
Implementation Method 1
a calculating unit that calculates a distance to a detection target using a length of time until floodlighted light is received by a light-receiving unit
Data Source
AI summary
A distance detection device is provided, including a calculating unit that calculates a distance to a detection target using a length of time until floodlighted light is received by a light-receiving unit; a first detecting unit that detects whether detection target changing operation is being performed; a second detecting unit that detects variation in the distance calculated by the calculating unit; a shake correcting optical system that is driven based on a shake detection result and through which the floodlighted light passes; and a control unit that controls driving of the shake correcting optical system using an output from the first detecting unit and an output from the second detecting unit.