Imaging Device Motion Compensation via Tracking Axis Alignment
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Solution Overview
Problem
Conventional imaging systems face challenges in capturing images of scenes in apparent motion without causing motion blur, especially in satellite-based systems, due to difficulties in achieving sufficient light exposure while preventing motion artifacts, and often result in large, heavy, and computationally intensive solutions.
Innovation Solution
An imaging system with a multi-axis positioning mechanism and a multi-band optical filter, which aligns a tracking axis with the direction of apparent motion and adjusts exposure times to capture partially overlapping images, allowing for high dynamic range and multi-spectral imaging without requiring the imaging device to be aligned with the motion direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If exposure time is increased to collect sufficient light, then light exposure is improved, but motion blur increases
Solution Approach 1:
The imaging device dynamically adjusts its position along the tracking axis during the exposure period to compensate for apparent motion. The device moves at a controlled speed that matches the apparent motion of the scene, allowing longer exposure times without introducing motion blur. This dynamic positioning resolves the contradiction by making the exposure process adaptive to the motion conditions.
Solution Approach 2:
The system changes the position parameter of the imaging device along the tracking axis during exposure. By adjusting the device's position in sync with the apparent motion, the system maintains image sharpness while allowing sufficient light accumulation. This parameter change enables decoupling of exposure time from motion blur constraints.
2Illumination intensity
If effective aperture is increased to collect more light, then light collection is improved, but device size and weight increase
Solution Approach 1:
Instead of increasing aperture statically, the system uses dynamic positioning along the tracking axis to enable longer exposures with smaller apertures. This allows satellite systems to use lighter optics while still collecting sufficient light by compensating for motion during extended exposure periods.
Solution Approach 2:
The patent replaces the mechanical solution of larger optics with a motion compensation mechanism. By using controlled movement along the tracking axis, the system substitutes physical aperture size with temporal integration, achieving equivalent light collection with smaller, lighter optical components.
3Manufacturing precision
If conventional imaging systems are used to prevent motion blur, then image quality is improved, but device complexity increases
Solution Approach 1:
The system uses a relatively simple dynamic positioning mechanism along a single tracking axis rather than complex multi-axis stabilization or TDI sensor arrangements. This dynamic approach achieves motion compensation with fewer components and lower complexity while maintaining image quality.
Data Source
AI summary
Imaging systems and methods for imaging of scenes in apparent motion are described. A multi-axis positioning mechanism is operable to move an area imaging device along a tracking axis. A control module directs the multi-axis positioning mechanism to set the tracking axis to be substantially parallel with the apparent motion, and directs the multi-axis positioning mechanism to move the area imaging device in one or more cycles such that the area imaging device moves, in each of the one or more cycles, forward along the tracking axis at a tracking speed that compensates for the apparent motion. The control module directs the area imaging device to take at least one exposure during each of the one or more cycles to generate one or more exposures. An imaging module forms an image of the scene based on the one or more exposures.