Resample method for remote sensing image composited based on image element imaging areas
An imaging area and resampling technology, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of resampled pixel gray scale distortion, resampled pixel gray scale imaging area does not correspond to the area, etc., to improve the real degree of effect
Inactive Publication Date: 2014-04-30
BEIHANG UNIV
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They replace the gray value corresponding to the resampled pixel imaging area with the gray value corresponding to the adjacent area or its combination, which is easy to cause the distortion of the gray value of the resampled pixel
Especially when the image resolution changes before and after resampling, it will inevitably cause the gray scale of the resampled pixel to not correspond to the area of the imaging area.
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[0017] The specific embodiment of the present invention is as figure 1 shown. Taking the geometric correction of Pushbroom Hyperspectral Imager (PHI) remote sensing image as an example, the specific steps are as follows:
[0018] 1. Select the coordinate system on which the resampling operation depends
[0019] The resampling operation in geometric correction is carried out in the map coordinate system, and its origin is selected at the center of the ground imaging area corresponding to the entire remote sensing image, the X axis points to the true east, the Y axis points to the true north, and the Z axis points vertically upward.
[0020] 2. Determine the four-sided imaging area of each pixel in the original image
[0021] For each pixel (i, j) of the original image, according to the auxiliary data and sensor performance parameters obtained during remote sensing imaging, calculate the four vertex coordinates of its ground imaging area:
[0022] ...
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A resample method for a remote sensing image composited based on an image element imaging area belongs to the technical field of earth observation. The method includes the steps of under a selected coordinate system, utilizing an image element quadrangle coordinate to outline imaging areas of each image element of an original remote sensing image and a resample image; then linearly compositing gray values of the original image elements with the imaging areas overlapped with the resample image elements, and obtaining gray level of the resample image elements. The resample method can be used for spatial dimension and resample during imagery geometric correction, rectification, mosaic, resolution ratio conversion and the like of the remote sensing image. Since gray level composition is carried out in the imaging areas of the resample image elements, the gray level of the image elements can reflect average luminance of surface features in the imaging areas, the surface features in the resample image have the real gray level and smooth edges, and trueness of the resample image is improved.
Description
technical field [0001] The invention relates to a remote sensing image resampling method based on pixel imaging area synthesis, belongs to the technical field of earth observation, and is a remote sensing image processing technology. Background technique [0002] In the process of geometric correction, registration, mosaic, and resolution conversion of remote sensing images, the spatial dimension resampling operation is involved, that is, the gray value of other coordinate positions is calculated by using the gray value of each pixel in the existing remote sensing image, so as to realize Scaling, rotation, deformation correction, etc. of remote sensing images. [0003] The three most commonly used resampling methods in remote sensing image processing are: nearest neighbor method, bilinear interpolation method and cubic convolution interpolation method, all of which are conventional methods in digital image processing. The nearest neighbor method takes the gray level of the ...
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IPC IPC(8): G06T5/00
Inventor 贾国瑞赵慧洁娄晨李娜
Owner BEIHANG UNIV