A method for image registration of a narrow-overlap dual-field hyperspectral imager

A hyperspectral imaging, dual field of view technology, applied in the field of hyperspectral image processing, can solve the problem of image registration method mismatching and other problems, and achieve the effect of solving the problem of direct stitching error and good image stitching effect.

Active Publication Date: 2018-02-13
SHANDONG UNIV
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Problems solved by technology

However, since the image formed by the narrow-overlap dual-field pushbroom hyperspectral imager has the characteristics of a small overlapping area of ​​the left and right fields of view, and there is a certain correspondence between the hyperspectral image and the left and right field of view images, there are errors in the image registration method based on mutual information. matching problem

Method used

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  • A method for image registration of a narrow-overlap dual-field hyperspectral imager
  • A method for image registration of a narrow-overlap dual-field hyperspectral imager
  • A method for image registration of a narrow-overlap dual-field hyperspectral imager

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Embodiment

[0040] The embodiment of the present invention is as follows, a method for image registration of the left and right field of view of a narrow-overlapping dual-field hyperspectral imager, which uses a computer to read, analyze, and calculate image data. The steps of the method are as follows:

[0041] 1) Read the required parameters: Read the ground coordinates (X 1 ,Y 1 ) and (X 2 ,Y 2 ), the number of pixels Samples_L and Samples_R, the number of lines Lines_L and Lines_R and the ground resolution r;

[0042] 2) Calculate the number of pixels (SX d ,SY d ):

[0043]

[0044] 3) Set the registration range of the two images: set the cycle range in the X direction to (minoffset_x, maxoffset_x), XX is the cycle variable in the X direction cycle range, and the cycle range in the Y direction is (minoffset_y, maxoffset_y),

[0045] YY is the loop variable of the loop range in the Y direction;

[0046] 4) Calculate the best matching position of the two images:

[0047] a) ...

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Abstract

A method of image registration for a narrow overlapping dual field of view hyperspectral imager. First, the ground coordinates of the geometrically corrected image are used to roughly calculate the correspondence between the left and right fields of view. Based on this correspondence, the calculation is performed within a certain relative position range. Mutual information, and remove the mutual information calculated when the number of overlapping pixels is small, and find the maximum mutual information among all the remaining mutual information, then the corresponding relationship between the left and right field of view images corresponding to the maximum mutual information is the best image Matching correspondence. This method uses the ground coordinates and mutual information after geometric correction of the image to calculate the matching relationship of the image. It can solve the problem of splicing errors caused by inaccurate ground coordinates after geometric correction and the problem of mismatching when registering based on mutual information. It is fast and accurate. Obtain the registration relationship of the images.

Description

technical field [0001] The invention relates to a method for registering left and right field of view images of a narrow-overlap dual-field hyperspectral imager, and belongs to the technical field of hyperspectral image processing. Background technique [0002] The push-broom hyperspectral imager is one of the most commonly used imagers in aerial photography, and multiple fields of view can expand its total field of view to capture wider images, so multi-field push-broom hyperspectral imaging The registration and stitching of the images produced by the instrument has become an important technical issue. [0003] The narrow-overlap dual-field pushbroom hyperspectral imager is a remote sensing hyperspectral imager developed by the Shanghai Institute of Technical Physics, Chinese Academy of Sciences. The image registration and stitching of the narrow-overlap dual-field pushbroom hyperspectral imager is Refers to image registration and stitching of left and right fields of view...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): G06T3/00G06T3/40
CPCG06T3/4038G06T3/14
Inventor马丕明张丽媛马艳华
OwnerSHANDONG UNIV