Seine Net Calibration Target for Image Sensors
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Solution Overview
Problem
Calibrating multispectral and hyperspectral image sensors on meteorological satellites and airborne vehicles is challenging due to radiometric errors, system noise, and environmental variables, which existing calibration methods fail to adequately address.
Innovation Solution
A seine net calibration target system comprising interconnected seine nets arranged in shapes like hexagons, with light sources along their edges, deployed on water surfaces to provide a controlled light source for image sensor calibration, capable of emitting light at specific wavelengths to saturate pixels and compensate for imaging errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional calibration methods are used for image sensors, then the calibration process is simpler, but radiometric errors and system noise cannot be adequately compensated
Solution Approach 1:
The patent introduces a seine net calibration target as an intermediary object between the image sensor and the natural environment. This target incorporates light sources that emit at specific wavelengths to simulate solar radiation, providing a controlled reference that mediates the calibration process. The target's modular design with interconnected seine nets allows it to be deployed in various configurations, serving as a flexible intermediary that can address radiometric errors without requiring complex laboratory equipment.
Solution Approach 2:
The calibration target utilizes light sources that can be controlled to emit at predetermined wavelengths, allowing dynamic adjustment of the calibration parameters. By changing the wavelength and intensity of emitted light, the system can simulate different solar radiation conditions and compensate for radiometric errors across multiple spectral bands. This parameter control enables precise calibration without requiring complex fixed-reference systems.
2Reliability
If a controlled light source is used for calibration, then radiometric errors can be compensated, but the calibration system becomes more complex
Solution Approach 1:
The calibration target is divided into modular segments - individual seine nets with integrated light sources that can be connected to form larger calibration structures. Each module contains its own light sources and can be independently deployed or configured. This segmentation allows the system to achieve the required reliability and coverage area without constructing a single complex monolithic structure, making the system more manageable and adaptable to different calibration scenarios.
Solution Approach 2:
The seine net calibration target serves multiple functions: it provides structural support for light sources, defines the calibration area geometry, and can be deployed in various configurations (different polygon shapes, different areas). The same modular components can be used for different spectral bands and calibration scenarios, reducing overall system complexity while maintaining high reliability across multiple calibration requirements.
3Illumination intensity
If light sources are arranged along the top edge of seine nets, then a sufficient light source is provided to saturate pixels, but the system complexity increases
Solution Approach 1:
The light sources are merged with the seine net structure itself, with lights integrated along the top edge of each net. This combination eliminates the need for separate support structures or mounting systems, as the seine net serves both as the structural element and the light-carrying element. The integration reduces overall system complexity while providing sufficient illumination intensity to saturate image sensor pixels for effective calibration.
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 system effectively reduces imaging errors by providing a bright, controlled light source that simulates natural sunlight, enabling precise calibration of image sensors and accounting for environmental factors, thereby improving the accuracy of spectral radiance measurements.
Implementation Method 1
The plurality of light sources emits light at a predetermined wavelength
Data Source
AI summary
A seine net calibration target for an image sensor can include a given set of seine nets connected to form a polygon and another set of seine nets. Each seine net of the other set of seine nets is coupled to a vertex of the polygon at a given end and coupled to a respective one of a plurality of boats at another end. The seine net calibration target can also include a plurality of light sources arranged along a top edge of the given set of seine nets and the other set of seine nets. The plurality of light sources emits light at a predetermined wavelength.