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Inhomogeneous light field underwater target detection image enhancing method based on threshold segmentation

An underwater target and image detection technology, applied in the field of image processing, can solve problems such as uneven illumination, and achieve the effects of improving texture contrast, authentic and reliable images, and protecting texture information.

Active Publication Date: 2014-08-27
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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  • Inhomogeneous light field underwater target detection image enhancing method based on threshold segmentation

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[0031] The present invention will be described in detail 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 and n...

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Abstract

The invention discloses an inhomogeneous light field underwater target detection image enhancing method based on threshold segmentation. The inhomogeneous light field underwater target detection image enhancing method based on threshold segmentation is characterized by comprising the steps that (1) an inhomogeneous light field underwater target detection image is read in; (2) the inhomogeneous light field underwater target detection image read in in the step (1) is transformed into an original gray level image; (3) an illumination intensity distribution diagram is fit from the gray level image, and the original gray level image is segmented into a plurality of pixel straps according to the illumination intensity distribution diagram; (4) threshold values are set, and the pixel straps are combined into a bright area, a normal area and a dark area according to the threshold values; (5) the normal area is selected, and target parameters are calculated; (6) according to the target parameters, dodging processing is carried out on each pixel strap. According to the inhomogeneous light field underwater target detection image enhancing method based on threshold segmentation, the integral harmony adjustment on the brightness and the texture of the whole image can be achieved, the processed image is made to be real and reliable, and texture information is abundant.

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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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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