Least square method-based adaptive radiation correction method for linear array push-broom image

Abstract

The invention relates to a least square method-based adaptive image radiation correction method with a linear array push-broom type. The method comprises the following steps that: a bad scanning column in an image is localized and weighted averaging is carried out on pixel gray values of normal columns at the left and the right of the bad scanning column to eliminate the influence of the bad scanning column on subsequent processing; a cause and a distribution characteristic of strips in a linear array push-broom image are analyzed and a strip column is adaptively determined according to a radiation correction precision value set by a user; for the strip column obtained by the determination, a least square method is used to carry out fitting calculation to obtain a relative radiation correction coefficient and relative radiation correction is carried out on all pixels of the strip column; and the relative radiation correction coefficient is stored into a database, thereby providing a query database for rapid subsequent application. According to the above-mentioned technical scheme, the relative radiation correction precision can be effectively ensured and it can also be guaranteed that physical significance of image data is not changed.

Description

technical field [0001] The invention relates to a linear array push-broom image self-adaptive radiation correction method based on the least square method, which belongs to the field of remote sensing image processing. Background technique [0002] With the rapid development of space technology, information technology and sensor technology, the resolution of remote sensing images has been greatly improved. Among all kinds of remote sensing imaging sensors, linear array CCD push-broom sensors are widely used. For example, foreign SPOT, IKONOS, QuickBird satellites and my country's CBERS-01 / 02, HJ1-A / B and other satellites are equipped with linear array CCD push-broom sensors. So far, the linear array push-broom sensor is an effective sensor for earth observation, and it is expected that this type of sensor will still have a good application prospect in the future. The linear array CCD camera adopts the push-broom imaging method, that is, the CCD line array is arranged on th...

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Problems solved by technology

[0007] The technical problem of the present invention is: to overcome the deficiencies of the prior art, and to propose a method for adaptive radiation correction of remote sensing images based on the least squares method, which solves the problems caused by using statistical models to correct the relative radiation of remote sensing images. Changes in grayscale distribution, loss of image detail information, etc., can effectively guarantee the smooth transition between image pixels and ensure the accuracy of radiation correction. The requirements for image processing are looser than traditional statistical methods, and neither uniform scenes nor enough image lines

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