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Preprocessing method for enhancing sonar image contract

An image comparison and preprocessing technology, applied in the field of image processing, can solve the problem of poor imaging quality of sonar images, and achieve the effect of simple algorithm, good noise reduction effect and fast operation speed.

Inactive Publication Date: 2015-07-22
HARBIN ENG UNIV
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  • Application Information

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Problems solved by technology

However, due to the limitations of the sonar equipment itself, the imaging quality of the sonar image is poor, and the noise points in the background are either very bright or very dark, and they are all isolated bright and dark points

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  • Preprocessing method for enhancing sonar image contract
  • Preprocessing method for enhancing sonar image contract
  • Preprocessing method for enhancing sonar image contract

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Embodiment Construction

[0040] The following will combine Figure 1 to Figure 15 The present invention is described in further detail.

[0041] A preprocessing method for enhancing the contrast of sonar images, comprising the steps of:

[0042] (1) Obtaining sonar image: Obtain the original sonar image from the sonar device.

[0043] (2) Linearly map the gray level of the sonar image to the range of 0-255.

[0044] (3) Find the average gray value of the image as a subsequent parameter.

[0045] (4) Calculate the maximum gray value and the minimum gray value of the image.

[0046] (5) Define a coefficient set Characterizes the magnitude of image pixel compression. It is related to the mean value of the 3*3 neighborhood of each pixel of the image f.

[0047] (6) Utilize coefficient set Perform grayscale compression on the image f. get image g c .

[0048] (7) For the compressed image g c Perform gamma correction to restore its gray scale to a level close to the original image.

[0049]...

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Abstract

The invention discloses a preprocessing method for enhancing sonar image contract. The preprocessing method includes the steps: acquiring an original sonar image from a sonar device; linearly mapping gray level of the sonar image to the scope ranging from 0 to 255; calculating maximum gray, minimum gray and average gray of the mapped image; setting a coefficient set, performing compression of the gray on the sonar image by the aid of the coefficient set to obtain the compressed image; correcting the gray of the compressed image to output the image subjected to gray compensation. The preprocessing method is simple, high in calculation speed and good in noise reduction effect.

Description

technical field [0001] The invention belongs to the field of image processing, in particular to a preprocessing method for enhancing the contrast of sonar images based on mean filtering. Background technique [0002] Image preprocessing technology is mainly to perform operations such as denoising and grayscale correction on the image. If we do not consider the loss of image information due to image degradation, but only selectively highlight the features of interest in the image and attenuate the features we do not need, then there is a lot of room for image preprocessing method selection. Commonly used image preprocessing methods include spatial domain methods and frequency domain methods. The spatial domain method directly operates on the pixels of the image, while the frequency domain method operates in the transform domain by subjecting the image to some kind of transformation. The method mainly relates to the neighborhood filtering method in the space domain method. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 叶秀芬王胜
Owner HARBIN ENG UNIV