Proportional light homogenizing method for aerial remote sensing image
An image and ratio technology, applied in the field of uniform light of aerial remote sensing images, can solve the problem of uneven brightness distribution of a single aerial remote sensing image, and achieve the effect of improving efficiency and quality and overcoming limitations.
Active Publication Date: 2012-09-26
WUHAN UNIV
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[0008] Aiming at the deficiencies in the prior art, the purpose of the present invention is to provide a ratio uniform light method for aerial remote sensing images that can simultaneously adjust the uneven brightness distribution and contrast distribution inside a single aerial remote sensing image
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[0027] The method of the present invention is based on the low-pass filtering method in the frequency domain, which can quickly separate the brightness distribution information from the image, and after normalizing the brightness distribution information, perform a subtraction operation on the original image and the background image, so as to adjust the brightness and contrast of the image The purpose of uneven distribution. In order to better understand the technical scheme of the present invention, the present invention will be described in further detail below in conjunction with accompanying drawing, and concrete steps of the present invention are as follows:
[0028] step 1,
[0029] Such as figure 1 As shown in the original aerial remote sensing image in (a), assuming that the size of the image is M×N, M and N are the pixel width and height of the image respectively, and the coordinates of each pixel in the image are set to (x, y), x ∈ [0, 1, 2, ..., M-1], y ∈ [0, 1, ...
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The invention discloses a proportional light homogenizing method for an aerial remote sensing image. The method comprises the following steps of: 1, transforming an original image into a frequency domain space by using discrete fourier transform to acquire a frequency spectrogram of the original image; 2, performing gaussian low-pass filtering processing on the frequency spectrogram acquired by the step 1 to acquire a low frequency information graph of the original image; 3, restoring the low frequency information graph acquired by the step 2 to be a brightness distribution background image graph of the original image by using inverse discrete fourier transform; and 4, performing proportional processing on each pixel in the original image and the image graph acquired by the step 3 to acquire a homogenized resultant image. By the method, the defect of limitation of the conventional light homogenizing method is overcome, image contrast distribution can also be adjusted while non-uniformbrightness distribution of the image is adjusted, and the method has great significance for improving efficiency and quality of generating a digital ortho image.
Description
technical field [0001] The invention belongs to the field of remote sensing image processing, in particular to a uniform light method for aerial remote sensing images. Background technique [0002] Dealing with the color problem of aerial and aerospace images is a time-consuming process in the production process of DOM (Digital Orthophoto Map, digital orthophoto). The problem of automatically processing the color of images is a classic problem that has been raised for a long time in the field of photogrammetry. From the earliest use of the mask method to process the image of analog aerial photos, until now the method in the field of digital signal processing is used to solve the color of digital images. People have done a lot of research on the problem of image color, and put forward various methods to solve the problem of image color. [0003] Generally speaking, there are two main factors affecting the final color quality of an orthophoto image. One is the uneven brightne...
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IPC IPC(8): G01C11/04
Inventor 孙明伟张祖勋张剑清
Owner WUHAN UNIV