Optronic System High-Frequency Motion Compensation
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Solution Overview
Problem
Current image stabilization techniques in optronic systems, such as cameras and gyro-stabilized systems, are ineffective in compensating for high-frequency movements, leading to sharpness issues in images, particularly in systems requiring high precision like binoculars or cameras with telephoto lenses.
Innovation Solution
The implementation of a method and device that utilizes a multi-element photodiode to detect and compensate for high-frequency movements by redirecting a portion of the light beam towards a high-frequency optical sensor, allowing for precise measurement and compensation of pixel movements using a conversion matrix, enabling effective motion compensation at high frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional image stabilization techniques are used, then low- and medium-frequency movements are compensated, but high-frequency movements are not compensated leading to image sharpness issues
Solution Approach 1:
The patent segments the motion compensation task into two distinct parts: low- and medium-frequency compensation handled by conventional image stabilization techniques, and high-frequency compensation handled by a separate photodiode-based detection system. This segmentation allows each subsystem to optimize for its specific frequency range, resolving the contradiction between maintaining image sharpness and achieving broad frequency range compensation.
2Measurement precision
If high-precision motion sensors are introduced to detect high-frequency movements, then high-frequency compensation is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent uses a photodiode as an intermediary device that indirectly detects high-frequency movements by measuring changes in light intensity caused by lens displacement. Instead of directly measuring high-frequency mechanical motion with complex sensors, the photodiode converts optical changes into electrical signals, providing high-frequency detection capability while keeping the system simple and cost-effective.
3Measurement precision
If the optronic system is treated as a rigid structure, then global motion is detected, but local micromovements causing high-frequency blur are not detected
Solution Approach 1:
The patent applies local quality by focusing the detection system specifically on local micromovements of the lens rather than treating the entire optronic system as a rigid structure. The photodiode is positioned to monitor only the local displacement of the lens element, enabling detection of high-frequency micromovements while maintaining a simple overall structural model that doesn't require complex multi-body dynamics analysis.
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
This solution enables the detection and compensation of very small high-frequency movements, improving image quality and precision by directly linking pixel movements to angular movements, thereby enhancing the overall image stabilization capabilities of optronic systems.
Implementation Method 1
a sensor, in this case a photodiode, makes it possible to detect, with a simple device, high-frequency movements
Implementation Method 2
by varying the optical path followed by a light beam representing a scene to a light-sensitive surface
Data Source
Figure 1A~2
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AI summary
Method for processing high-frequency movements in an optronic system comprising an image sensor operating with a first acquisition frequency, each image obtained by the image sensor being representative of a scene, the method comprising a step (401) of obtaining values of signals representative of a movement of said scene from a high-frequency movement sensor operating with a second acquisition frequency higher than the first acquisition frequency, a step (402) of determining values representative of a movement of an image during acquisition by the image sensor from values of the signals representative of the movement of said scene, and a step (403) of transmitting the values representative of the movement of the image during acquisition by the image sensor to a movement-compensating device in order for said movement-compensating device to be able to compensate the movement of the image during acquisition by the image sensor.