Discrete cosine transform based panchromatic and multispectral image fusion method

A discrete cosine transform and multi-spectral image technology, applied in the field of remote sensing, can solve the problems of high computational complexity and large spatial distortion of fusion images, and achieve the effects of small spectral distortion, small spatial detail distortion, and improved fusion speed

Inactive Publication Date: 2018-06-22
SICHUAN UNIV
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Problems solved by technology

The multi-resolution analysis method has the advantage of less spectral distortion of the fused image, but the disadvantage is that the computational complexity is high and the spatial distortion of the fused image is large

Method used

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  • Discrete cosine transform based panchromatic and multispectral image fusion method
  • Discrete cosine transform based panchromatic and multispectral image fusion method
  • Discrete cosine transform based panchromatic and multispectral image fusion method

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Embodiment

[0022] Such as figure 1 As shown, this embodiment provides a method for fusion of panchromatic and multispectral images based on discrete cosine transform, which extracts high-frequency information in high-resolution panchromatic images by introducing the DCT transform widely used in image compression standards, And it is successfully injected into the low-resolution multi-spectral image through DCT inverse transformation, so as to obtain the high-resolution multi-spectral image.

[0023] The method of panchromatic and multispectral image fusion based on discrete cosine transform mainly includes five steps. Below, each step is described in detail:

[0024] (101) Input a set of QuickBird satellite remote sensing images, including a high-resolution panchromatic image P with a size of 14980×13116 and four low-resolution multispectral images MS with a size of 3745×3279 k , k=1, 2, 3, 4

[0025] (102) Divide the high-resolution panchromatic image P into 3745×3279 non-overlapping...

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Abstract

The invention discloses a discrete cosine transform based panchromatic and multispectral image fusion method and overcomes defects and shortcomings of existing panchromatic and multispectral image fusion method. The discrete cosine transform based panchromatic and multispectral image fusion method is characterized in that high-frequency information in panchromatic images is extracted by introduction of DCT (discrete cosine transform) transform extensively adopted in an image compression standard and successfully injected into low-resolution multispectral images through DCT inverse transform. Compared with the prior art, the method has advantages that fusion speed is evidently increased on the premise that low spatial detail distortion and low spectral distortion are guaranteed, and accordingly powerful technical support is provided for panchromatic and multispectral image fusion.

Description

technical field [0001] The invention relates to the technical field of remote sensing, in particular to a method for combining panchromatic and multispectral images based on discrete cosine transform. Background technique [0002] High-resolution remote sensing satellites such as QuickBird, IKONOS, GeoEye, etc. can simultaneously provide panchromatic (Panchromatic, Pan) band images and multispectral (Multispectral, MS) band images. Panchromatic images have high spatial resolution, reflecting the Spatial structure information can express the detailed features of ground objects in detail, but the spectral resolution is insufficient; multispectral images have rich spectral information, which is beneficial to the recognition and interpretation of ground objects, but the spatial resolution is low. However, in remote sensing applications such as visual interpretation, change detection and other tasks, MS images with high spatial and spectral resolution are often required. Panchrom...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50G06F17/14
CPCG06T5/50G06F17/147G06T2207/10036G06T2207/20052
Inventor 李晓华周激流
Owner SICHUAN UNIV
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