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Ortho-rectification processing method for night images

A processing method and orthorectification technology, applied in the field of remote sensing image processing, can solve the problems of time-consuming calculation and huge amount of remote sensing image data, and achieve the effect of improving efficiency, flexible and fast orthorectification, and reducing the amount of calculation.

Active Publication Date: 2017-12-26
CHANGGUANG SATELLITE TECH CO LTD
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Problems solved by technology

[0006] When dealing with orthorectification of remote sensing images, it is necessary to calculate each pixel of the image point by point, and the data volume of remote sensing images is very large, so the calculation is very time-consuming

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  • Ortho-rectification processing method for night images

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Embodiment Construction

[0052] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0053] The night scene image orthorectification processing method provided by the present invention is based on the existing remote sensing image orthorectification algorithm, and the product structure of Jilin No. 1 video 3 stars, and adopts an orthorectification model based on Rational Polynomial Coefficients (RPC for short). Perform orthorectification.

[0054] The RPC model combines object space coordinates D(L, P, H), (where L stands for Longitude, referred to as lon), P stands for latitude Latitude, referred to as lat, H stands for ground elevation Height) and its corresponding image coordinates d(X, Y ), (where X represents the number of pixels in the horizontal direction of the image, and Y represents the number of pixels in the vertical direction of the image), which are associated with a ratio polynomial. In order to enhance the stability of the parameter ...

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Abstract

The invention relates to an ortho-rectification processing method for night images and relates to the field of remote sensing image processing. The method includes steps of creating an orthographic output image in a manner of mapping the output image to an original image pixel by pixel, acquiring a gray value through interpolation on the original image and bestowing the gray value to a corresponding position of the output image. According to the invention, as for a night image with a large size black area, based on a prior remote sensing image ortho-rectification algorithm, a rational polynomial coefficient based ortho-rectification model is adopted for ortho-rectification. Through pixel-by-pixel mapping of the output image to the original image, only ortho-rectification calculation of the original image is required and point-by-point calculation is saved, so that a large amount of calculation is reduced and the efficiency of night image ortho-rectification is improved substantially. According to the invention, ortho-rectification can be performed on the night images effectively targeting at characteristics of the night images and flexible and quick ortho-rectification can be achieved.

Description

technical field [0001] The invention relates to the field of remote sensing image processing, in particular to a night scene image orthorectification processing method. Background technique [0002] Satellites with night scene images of large black areas, such as the Jilin-1 video 3 satellite (Linye-1 satellite), use the function of area array staring at night to image the ground objects at night. Area array imaging has the following characteristics: (1) Compared with linear array imaging, the same image has the same temporal image, has the same outer orientation elements, and is easy to process; (2) The area array staring function can increase the exposure time of the image. The brightness of the ground is relatively low, so a long exposure is required to have a clearer picture. [0003] Although the exposure time of the satellite can be set longer, the average gray level of the image will still be relatively low, which needs to be enhanced to make it conform to people's o...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T3/00
CPCG06T3/147
Inventor 谷文双陆晗白杨潘征王灵丽武红宇钟兴
Owner CHANGGUANG SATELLITE TECH CO LTD
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