Image splicing method aiming at side-scan sonar imaging features

A technology of image stitching and side scan sonar, which is applied in image enhancement, image data processing, instruments, etc., can solve the problems of Doppler effect, low resolution of side scan sonar imaging, ghosting, etc.

Inactive Publication Date: 2015-03-11
南京恒誉名翔科技有限公司
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Problems solved by technology

[0004] An image mosaic method aimed at the characteristics of side-scan sonar imaging of the present invention aims to solve the problems of low resolution, serious noise pollution, ghosting, Doppler effect and the like in side-scan sonar imaging

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  • Image splicing method aiming at side-scan sonar imaging features
  • Image splicing method aiming at side-scan sonar imaging features

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Embodiment 1

[0026] combine figure 1 , figure 1 Flow chart for the image stitching system. The present invention studies the stitching problem based on image feature points, and mainly studies Harris corner point detection based on fusion scale space theory and SIFT feature description of diagonal points to realize image registration. In the image fusion stage, after the transformation relationship between images corresponds, affine transformation and weighted average method are used to complete the fusion of images in space and pixels, and a complete stitched image is obtained.

[0027] (1) In the image preprocessing stage, in view of the shortcomings of Harris corners being sensitive to scale changes, a multi-scale Harris corner detection algorithm integrated with the scale space theory is proposed. After the detection of two sets of scale-transformed templates, the detected Harris corners are more accurate and scale-invariant, and also lay the foundation for the SIFT description below...

Embodiment 2

[0032] An image stitching method based on the characteristics of side scan sonar imaging. The improved Harris corner detection algorithm is implemented as follows: constructing different scale spaces is to detect the feature points with scale invariance in the image, and the Gaussian function is used to establish the scale. space:

[0033] G( , )= ,

[0034] Let I( ) is the pixel of the input image, G( , ) is a variable-scale Gaussian function, and the scale space of the image is defined as L( , ), the expression is as follows:

[0035] L( , )=I( )^G( , ),

[0036] Among them, ^ represents the convolution operation, which represents the scale space parameter. If the scale space is large, the scale space describes the general characteristics of the image; if the scale space is small, the scale space describes the detailed characteristics of the image. With the change, a set of scale spaces with different scales is established. ; select first The Ga...

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Abstract

The invention discloses an image splicing method aiming at side-scan sonar imaging features. The method aims at solving the problems of low resolution, serious noise pollution, ghosting, Doppler effects and the like in the side-scan sonar imaging. According to the method, the study is carried out on the basis of a splicing problem of image feature points; the scale-space-theory-fusing Harris corner detection and SIFT feature description on corners are mainly studied; and further, the image registration is realized. In an image fusion stage, after the image conversion relationship corresponding, affine transformation and weighted average methods are sequentially adopted for completing the image fusion in the space and pixels, and a complete spliced image is obtained.

Description

technical field [0001] The invention relates to an image splicing technology, in particular to an image splicing method aiming at the characteristics of side scan sonar imaging. Background technique [0002] Sonar detection technology is a key means in the field of ocean surveying and mapping. The side scan sonar transmits sound waves to the seabed and then receives the reflected sound waves in turn, and uses the principle of different seabed geology to reflect different sound wave intensities to draw the seabed topography. However, what the side scan sonar gets is only a strip that describes the topography of the seabed. If you want to get a complete topographic map of the seabed, you need to splicing each adjacent strip to draw a sonar mosaic map in the entire area. The content of this paper is the stitching technology of side-scan sonar images. The sonar images within the measurement range are stitched together in sequence, and the sonar stitching map of the entire range...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/50
Inventor 费浚纯
Owner 南京恒誉名翔科技有限公司
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