Aerial Camera Electronic Global Shutter PLS Artifact Reduction
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Solution Overview
Problem
Aerial camera systems face challenges such as mechanical shutter wear, complexity, and parasitic light signal (PLS) artifacts, which degrade image quality and require complex mechanical stabilization.
Innovation Solution
The aerial camera instrument employs an electronic global shutter with a simultaneous start and stop for integration, coupled with an external dispersive shutter component that reduces light transmission during the readout phase, thereby minimizing PLS effects and shutter actuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a mechanical shutter is used to control light transmission, then the integration time can be precisely controlled, but the shutter experiences wear from repeated actuations and has limited lifespan
Solution Approach 1:
The patent replaces the mechanical shutter with an electronic global shutter implemented in the imaging sensor. The electronic shutter controls light transmission by electronically gating the pixel readout process, eliminating mechanical moving parts. This substitution maintains precise integration time control through electronic timing mechanisms while completely avoiding the wear and reliability issues associated with mechanical actuation.
Solution Approach 2:
The patent changes the operational parameters of the imaging sensor to enable electronic shuttering. By utilizing the global shutter capability inherent in the sensor's readout architecture, the system achieves variable integration times (e.g., 1ms to 100ms) through electronic control of charge transfer and readout timing, replacing the need for mechanical aperture or shutter adjustments.
2Productivity
If a mechanical shutter actsuates frequently to capture high-frame-rate images, then the image acquisition speed increases, but the shutter wear accumulates rapidly
Solution Approach 1:
The patent eliminates the mechanical shutter system entirely by implementing electronic global shuttering at the sensor level. This allows the system to achieve high frame rates (5 fps or higher) through electronic control of the readout process, with no mechanical components subject to wear from repeated actuation. The electronic shutter can be toggled instantaneously without degradation.
Solution Approach 2:
The imaging sensor performs its own shuttering function through integrated electronic global shutter circuitry. The sensor independently controls the timing of charge transfer and readout operations, eliminating the need for external mechanical shutter mechanisms. This self-service capability enables rapid, wear-free shuttering operations.
3Illumination intensity
If the aperture is kept large to allow more light, then the image brightness increases, but the mechanical shutter cannot close fast enough to prevent overexposure in strong sunlight
Solution Approach 1:
The patent replaces the mechanical shutter with an electronic global shutter that can instantaneously control light transmission timing. This electronic system achieves shutter speeds orders of magnitude faster than mechanical alternatives, enabling precise control of integration time even with large aperture settings in bright sunlight conditions. The electronic gating of pixel readout occurs without the speed limitations of mechanical leaf movement.
4Speed
If an electronic global shutter is used instead of a mechanical shutter, then the shutter speed increases and wear is eliminated, but parasitic light signal artifacts appear in the images
Solution Approach 1:
The patent extracts and removes the harmful parasitic light signal from the image data through post-processing operations. The electronic global shutter inherently allows some parasitic light (PLS) to reach the sensor during the readout phase, but the system applies digital filtering and correction algorithms to detect and remove these artifacts, particularly the characteristic PLS streaks that appear in high-reflectivity scenes.
Solution Approach 2:
The patent converts the presence of parasitic light signal, which would normally be purely harmful, into a detectable pattern that can be identified and corrected. By understanding the temporal and spatial characteristics of PLS artifacts in electronic shuttered images, the system applies targeted processing to remove these artifacts while preserving the legitimate image signal, effectively turning the problem into a solvable detection task.
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 configuration enhances image quality by reducing PLS artifacts, extending the useful lifetime of components, and simplifying mechanical stabilization, while maintaining high-resolution image acquisition capabilities.
Implementation Method 1
The aerial camera instrument comprises an external shutter component embodied as a dispersive element with variable scattering states
Data Source
AI summary
An aerial camera instrument configured to acquire high-resolution aerial images from a target area. The aerial camera instrument comprises (i) an imaging sensor having an electronic global shutter functionality, (ii) an external shutter component, and (iii) a coupling functionality configured to synchronize the electronic global shutter functionality and the external shutter component.