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Unmanned aerial vehicle multispectral image registration method

A technology of a method for multispectral image registration of unmanned aerial vehicles, which is applied in the field of image processing and can solve problems such as poor success rate and poor registration accuracy.

Active Publication Date: 2021-11-23
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for multispectral image registration of UAVs in view of the technical problems of poor registration accuracy and poor success rate during registration of existing UAV multispectral images

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Embodiment Construction

[0021] In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0022] At present, UAV thermal infrared cameras generally include two lenses, which are responsible for collecting thermal infrared data and visible light data respectively, such as figure 1 shown. Due to the different positions of the two lenses, there is no registration between the thermal infrared image and the visible light image. In the embodiment of the present invention, the thermal infrared image is used as a reference image, and the visible light image is registered toward the thermal infrared image, that is, the visible light image is used as an input image.

[0023] join figure 2 , the method for UAV multispectral image registration provided by the embodiment of the present invention includes five parts: preprocessing, at...

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Abstract

The invention discloses an unmanned aerial vehicle multispectral image registration method, and belongs to the technical field of image processing. The method comprises the following steps: extracting CFOG features from a preprocessed reference image and an input image; equally dividing the reference image into a plurality of atom blocks which are not overlapped with each other; determining a search area of each atomic block according to the maximum deviation between the reference image and the input image; obtaining a similarity graph of the atomic blocks in the search area based on template matching; obtaining pyramid similarity graphs of blocks with different sizes through multi-layer local maximum value aggregation; deriving the optimal matching position corresponding to the block of the current layer from the highest layer in the pyramid similarity graph layer by layer, and obtaining the homonymy points of the atomic blocks so as to obtain a homonymy point set; and deleting the homonymy points with errors exceeding a specified error range in the homonymy point set, and registering the reference image and the input image based on the homography matrix. The invention is high in registration precision, and can achieve the high-precision registration performance in various scenes.

Description

technical field [0001] The invention relates to the technical field of image processing, in particular to a method for multi-spectral image registration of an unmanned aerial vehicle. Background technique [0002] Thermal infrared and visible light registration is an important problem in the fields of computer vision and remote sensing. UAV thermal infrared and visible light registration is an important preliminary step for tasks such as crop yield estimation, surface biomass calculation, and target detection. [0003] Because thermal infrared and visible light images reflect different information of objects, thermal infrared reflects the temperature information of the target, and visible light reflects the reflectivity information of objects, so there is no corresponding relationship between the pixel values ​​of thermal infrared and visible light images, and the texture shape information There is a big difference. Existing feature extraction and It is difficult for matc...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T7/33G06K9/46G06K9/62
CPCG06T7/337G06T2207/10036G06T2207/20016G06T2207/20021G06F18/22Y02A40/10
Inventor 周纪孟令宣丁利荣王子卫马晋张旭
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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