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Segmental counting-based relative radiation correction method

A technology of relative radiometric correction and segmental statistics, applied in the field of relative radiometric correction based on segmental statistics, which can solve problems such as noise and inter-chip chromatic aberration

Inactive Publication Date: 2013-07-31
WUHAN UNIV
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Problems solved by technology

[0003] The problem to be solved by the present invention is to provide an effective relative radiation correction method based on segment statistics for the systematic banding noise and inter-chip chromatic aberration phenomenon in satellite images

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  • Segmental counting-based relative radiation correction method
  • Segmental counting-based relative radiation correction method

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Embodiment Construction

[0027] The technical solution of the present invention can use computer software technology to realize the automatic operation process, and the technical solution of the present invention will be described in detail below in conjunction with the accompanying drawings and embodiments. see figure 1 , the process of the embodiment can be divided into 4 steps:

[0028] Step 1, get the original image data.

[0029] In specific implementation, it is recommended that the selection of original images be carried out according to the following principles:

[0030] (1) The ground objects contained in the multiple images selected from the multi-track images should at least cover the imaged ground objects in the low-brightness area, medium-brightness area and high-brightness area, and the corresponding representative ground objects are ocean, city and cloud respectively. ;

[0031] (2) The multiple images selected from the multi-track images must be images in the same shooting mode, tha...

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Abstract

The invention relates to a segmental counting-based relative radiation correction method comprising the following steps: acquiring original image data; determining segmental points and dividing the image into three brightness areas, including a low-brightness area, a medium-brightness area and a high-brightness area; performing histogram matching on the low-brightness area, the medium-brightness area and the high-brightness area respectively to obtain a corresponding brightness area lookup table of each probe element; and combining to obtain an integrated lookup table of each probe element and performing relative radiation correction on a satellite image. Aiming at the condition that integrating spheres in a lab are invalid, the method provides a method for effectively removing stripe noise of an image system and chromatic aberration of the system, so the lookup tables of different brightness areas are obtained through segmental counting according to the characteristic that the probe elements have different response models in different photoelectric response areas, error propagation in the counting process is reduced, the precision of the lookup tables is improved, the imaging quality of the image can be improved well, the algorithm has high efficiency, and the quasi-real time requirement of image production can be guaranteed timely.

Description

technical field [0001] The invention belongs to the field of remote sensing image processing and relates to a relative radiation correction method based on segment statistics. Background technique [0002] Spaceborne TDI-CCD (Time Delay and Integration Charge-coupled Device) imaging data radiation processing method, that is, spaceborne TDI-CCD relative radiation correction, refers to the original digital data measured by satellite remote sensors in order to correct the difference in the responsivity of each probe. A process in which the count value is "re-quantized". Due to the difference between the photoelectric response functions of load detectors, when imaging the same brightness area, different detectors will output different DN values ​​(Digital Number remote sensing image pixel brightness value, that is, the gray value of the recorded ground object) , resulting in banding or inter-slice chromatic aberration that runs through the push-broom direction on remote sensing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/40
Inventor 王密张柄先潘俊李德仁
Owner WUHAN UNIV
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