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Snapshot type hyperspectral image demosaicing method

A hyperspectral image and demosaicing technology, applied in the field of snapshot hyperspectral image demosaicing, can solve the problem of high computational complexity, achieve broad application prospects, improve the peak signal-to-noise ratio of hyperspectral image demosaicing, and have a large number of channels. Effect

Pending Publication Date: 2019-11-15
TIANJIN UNIV
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Problems solved by technology

[0006] The calculation complexity of the above algorithm is high, and the aliasing effect on the edge and texture part of the filter array demosaic image with a large number of channels is more obvious

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  • Snapshot type hyperspectral image demosaicing method
  • Snapshot type hyperspectral image demosaicing method
  • Snapshot type hyperspectral image demosaicing method

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Embodiment 1

[0040] A snapshot hyperspectral image demosaicing method, see figure 1 , the method includes the following steps:

[0041] 101: Calculate the corresponding weight according to the Euclidean distance between the target pixel point and the adjacent pixel point;

[0042]102: Perform correlation weighted interpolation according to different weights of adjacent pixel positions to obtain the pixel value of the target pixel;

[0043] 103: Divide the interpolated initial demosaiced hyperspectral image into several three-dimensional image blocks, search for image blocks similar to the three-dimensional image blocks to be processed, and combine them into a new data cube;

[0044] 104: The synthesized data cube has low rank, and it is processed with a low rank optimization algorithm to extract sub-image blocks optimized by the algorithm, and reconstruct and combine each sub-image block to obtain the final demosaiced hyperspectral image.

[0045] In summary, the embodiment of the presen...

Embodiment 2

[0047] Combine below figure 2 with image 3 For a further introduction to the snapshot hyperspectral image demosaicing method provided by the embodiment of the present invention, see the following description for details:

[0048] The snapshot hyperspectral imaging technology based on the spectral filter array directly obtains a severely undersampled mosaic image. The spectral filter array covered on the sensor surface allows each pixel position to only collect spectral information of a certain band. To obtain a complete Hyperspectral images require demosaicing of mosaic images. The hyperspectral image demosaicing technology proposed in the embodiments of the present invention can efficiently and accurately reconstruct hyperspectral images, and has a good effect on preserving image details and textures. And there is no need to consider the arrangement mode and channel number of the filter array. In conjunction with the accompanying drawings, the detailed description is as ...

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Abstract

The invention discloses a snapshot type hyperspectral image demosaicing method. The method comprises the following steps: carrying out spectral channel separation preprocessing on an original mosaic image; independently interpolating each spectrum channel by using a correlation weighted interpolation algorithm to obtain an initial reconstructed hyperspectral image; performing block preprocessing on the initial reconstructed hyperspectral image; performing rank reduction optimization processing on the sub-image blocks by using a low-rank image optimization algorithm; and reconstructing and combining each optimized sub-image block to obtain a final demosaicing hyperspectral image. The method has a good storage effect on the edge part and tiny details of the image, and is an accurate and efficient hyperspectral image demosaicing technology. The noise introduced in the initial interpolation process can be effectively reduced by using a low-rank image optimization algorithm, and the signal-to-noise ratio of the demosaiced hyperspectral image is further improved. The method has remarkable advantages, can obtain a reconstructed hyperspectral image with a high signal-to-noise ratio, and has a good storage effect on the edge part and tiny details of the image.

Description

technical field [0001] The invention relates to the field of image processing, in particular to a snapshot hyperspectral image demosaicing method. Background technique [0002] Hyperspectral images can not only obtain the spatial information of the scene, but also obtain its spectral information, which has a wide range of application values. At present, most hyperspectral imaging systems use multiple independent image sensors to acquire spectral channel images of different bands respectively, so there are problems such as high cost, large volume, long photographing time, and image registration. Hyperspectral images can be obtained by covering a layer of spectral filter array (Spectral Filter Array, SFA) on the surface of hyperspectral imaging system CCD (Charge Coupled Device) or CMOS (Complementary Metal Oxide Semiconductor) sensor. The image acquired by this snapshot hyperspectral imaging system can only collect information of a certain spectral band at each pixel positio...

Claims

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Application Information

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IPC IPC(8): G06T5/00G06T3/40
CPCG06T3/4015G06T2207/20021G06T5/00Y02A40/10
Inventor 李奇峰吕海岳马翔云王慧捷孙雪晴
Owner TIANJIN UNIV
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