A Color Correction Method for Multispectral Camera

A color correction and color correction coefficient technology, applied in the field of aerospace remote sensing, can solve the problems of multiple setting parameters, output DN value changes, high cost, etc., and achieve the effect of improving the synthesis accuracy

Active Publication Date: 2017-11-28
BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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AI Technical Summary

Problems solved by technology

[0005] Due to the imaging mode and focal length of the linear array aerospace remote sensing multispectral camera and the large field of view long focal length area aerial remote sensing multispectral camera, the standard color plate test distance is required to be relatively large, and the test work cannot be completed in the laboratory. The method of imaging test with standard color plates is no longer applicable; considering the performance requirements of camera aperture, field of view and focal length, it is difficult and expensive to make large-caliber monochrome standard plates of different colors, and this method is not feasible
In addition, there are many parameters that can be set for each multi-spectral spectrum band of this type of remote sensing camera, which will lead to changes in the output DN value of the corresponding spectrum band, causing great difficulties for color correction

Method used

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  • A Color Correction Method for Multispectral Camera

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Embodiment Construction

[0026] First, a brief introduction to the basic theory of colorimetry is given. The color of objects can be divided into two categories: self-luminous and non-luminous. The former is called the light source color, and the latter is called the object color. According to the principle of chromaticity, whether it is the color of the light source or the color of the object, its color mainly depends on the spectral power distribution of the light radiation directly entering the observer's eyes. The general formula for calculating the tristimulus value (XYZ) of a color is

[0027]

[0028] In the formula: X, Y, Z—color tristimulus value;

[0029] K - normalization factor;

[0030] φ(λ)——the spectral power distribution of the light radiation directly entering the observer's eyes;

[0031] - Spectral tristimulus value of standard chromaticity observer;

[0032] Δλ——wavelength interval.

[0033] The color of the filter glass belongs to the transmitted object color. Therefor...

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Abstract

The invention relates to a color correction method for a multi-spectral camera. The optical path system of the invention is composed of an integrating sphere light source, a transmissive 24-color standard color plate, a light baffle with holes, a collimator, and a spectroradiometer. The light beam emitted by the integrating sphere light source passes through the color block of the transmission type 24-color standard color plate and the light baffle plate with openings, reaches the focal plane of the collimator, collimates through the collimator, and enters the spectroradiometer to obtain the original data. The invention realizes the color correction of various types and calibers of linear array CCD aerospace remote sensing multispectral cameras and large field of view and long focal length area array multispectral cameras.

Description

technical field [0001] The invention relates to a multispectral camera color correction method, which can be widely used in the field of aerospace remote sensing. Background technique [0002] Multispectral cameras are used more and more widely in the field of aerospace remote sensing. With the increasing requirements for high resolution and high performance of remote sensors, large aperture, long focal length line array cameras and large field of view long focal length area array multispectral cameras are becoming more and more important in the field of aerospace remote sensing. [0003] The spectral band setting of the multi-spectral camera is generally four spectral bands of red, green, blue and near-infrared, and the red, green and blue spectral bands are respectively named as B1, B2, and B3 spectral bands. True-color remote sensing images are composed of red, green, and blue spectral bands, and the color of the subject is displayed as faithfully as possible. True colo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N5/225H04N1/60
Inventor 郭永祥李永强王静怡柯君玉李洋廖志波宗肖颖
Owner BEIJING RES INST OF SPATIAL MECHANICAL & ELECTRICAL TECH
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