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Image enhancement method for underwater target detection in non-uniform light field based on threshold segmentation

A technology for detecting underwater targets and images, applied in the field of image processing, can solve problems such as uneven illumination, achieve the effect of improving texture contrast, making images real and reliable, and protecting texture information

Active Publication Date: 2016-09-07
HOHAI UNIV CHANGZHOU
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Problems solved by technology

[0003] In order to solve the deficiencies in the prior art, the object of the present invention is to provide a non-uniform light field underwater target detection image enhancement method based on threshold segmentation, which solves the problem of uneven illumination in the non-uniform light field underwater target detection image in the prior art. Uniform Technical Issues

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  • Image enhancement method for underwater target detection in non-uniform light field based on threshold segmentation
  • Image enhancement method for underwater target detection in non-uniform light field based on threshold segmentation
  • Image enhancement method for underwater target detection in non-uniform light field based on threshold segmentation

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Embodiment Construction

[0031] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0032] refer to figure 1 As shown, the overall flow chart of the non-uniform light field underwater target detection image enhancement method based on threshold segmentation in the present invention is as follows figure 1 As shown, the specific steps are as follows:

[0033] Step 1: Read in an underwater image with uneven illumination.

[0034] Step 2: Convert the uneven illumination image read in step 1 into a grayscale image.

[0035] Step 3: Use linear spatial filtering to fit the light intensity distribution map from the grayscale image, and divide the original grayscale image into several pixel bands according to the gray value of the light intensity distribution map. The specific steps are:

[0036] (3a) Establish a filter mask, that is, establish a filter mask that matches the image window. The filter mask is Among them, m a...

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Abstract

The invention discloses a non-uniform light field underwater target detection image enhancement method based on threshold segmentation, which is characterized in that it includes: step 1: read in a non-uniform light field underwater target detection image; step 2: step The non-uniform light field underwater target detection image read in step 1 is converted into the original grayscale image; Step 3: Fitting the illumination intensity distribution map from the grayscale image, and dividing the original grayscale image according to the illumination intensity distribution map for several pixel bands; step 4: set the threshold value, and merge the pixel bands into brighter areas, normal areas and darker areas according to the threshold; step 5: select the normal area, and calculate the target parameters; step 6: according to the target parameters, the Each pixel band is dodged. The invention can realize the overall coordinated adjustment of the brightness and texture of the whole image, so that the processed image is real and reliable, and the texture information is rich.

Description

technical field [0001] The invention relates to an image enhancement method, in particular to an image enhancement method for underwater target detection in a non-uniform light field based on threshold segmentation, and the invention belongs to the field of image processing. Background technique [0002] In terms of acquisition of underwater target detection images with non-uniform light fields, due to the scattering and absorption of light by water bodies, currently the surface texture information of objects is mainly obtained by close-range photography, and the use of auxiliary light sources will inevitably lead to uneven illumination. The uneven illumination is manifested as centering on the strongest point of the illumination light and gradually weakening in the radial direction. There are three areas: brighter, normal, and darker areas. The brightness of the brighter area and the darker area form a strong contrast, and the visual effect is not good. The texture informat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00G06T7/00
Inventor 范新南史朋飞巫鹏马金祥谢迎娟张卓
Owner HOHAI UNIV CHANGZHOU
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