A Fast and Efficient Mean Filtering Method for Removing Salt and Pepper Noise from Images

A technology of salt and pepper noise and mean filtering, applied in the field of image salt and pepper noise removal, can solve the problem of long calculation time, achieve good noise removal, avoid the loss of calculation and image details, and maintain the effect of good details

Active Publication Date: 2016-04-13
ZHEJIANG UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional method of processing salt and pepper noise uses image-related parameters to detect and eliminate noise, but while removing noise, it also modifies the gray value of non-noise pixels, and the calculation time is long

Method used

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  • A Fast and Efficient Mean Filtering Method for Removing Salt and Pepper Noise from Images
  • A Fast and Efficient Mean Filtering Method for Removing Salt and Pepper Noise from Images
  • A Fast and Efficient Mean Filtering Method for Removing Salt and Pepper Noise from Images

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Embodiment

[0040] Choose 5 256-level grayscale images with a size of 512×512 as the test images. The 5 images are named Image Couple, Image Lena, Image Pepper, Image Man, Image Baboon, and add 20%, 40%, 60%, 80%, 90%, 95% salt and pepper noise, compared with the other three common methods PSMF (Progressiveswitchingmedianfilterfortheremovalofimpulsenoisefromhighlycorruptedimages), DBA (Anewfastandefficientdecision-based algorithmforremovalofhigh-densityimpulsenoises) and NAFSMF PSNR (db) is used to measure the denoising ability of the four methods.

[0041] The filtering window of the method of the present invention is as figure 1 Shown. In an 8-bit grayscale image, set the initial filter window size W of the image X contaminated by salt and pepper noise to 3×3, if figure 1 The black solid squares in are suspected noise pixels, and the aforementioned filtering processing is performed accordingly.

[0042] According to the criterion that the closer the pixel to the center pixel, the smaller th...

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Abstract

The invention discloses an average filtering method eliminating image impulse noise fast and efficiently. The method comprises the following steps that filtering windows of images are set in the 8-bit grey-scale images, if the grey value of center pixels is 0 or 255, the pixels are suspected to be the noise pixels, and otherwise the pixels are the signal pixels; if the pixels are suspected to be the noise pixels, the signal pixels are extracted from the boundary pixels to form a set, and if the pixels are the signal pixels, the pixels are not processed; if the set formed by the extracted signal pixels is a non-null set, processing is not carried out, and if the set is a null set, two is added to the number of the filtering windows until the new set is a non-null set; the element grey value average of the set is used for replacement, and processing of the above steps is repeated until all suspected noise pixels obtain the filtered images. The method has good abilities to eliminate noise and maintain details, is high in practicality, and achieves adaptive filtering of the images, high-density impulse noise can be eliminated simply and efficiently, the edge and image details are retained, and the efficiency is higher than that of a traditional filtering method.

Description

Technical field [0001] The invention relates to a method for removing salt and pepper noise of an image, in particular to a mean filtering method for quickly and efficiently removing salt and pepper noise of an image. Background technique [0002] The image is affected by factors such as the external environment and the quality of sensor elements during the process of acquisition, transmission, and reception. Different types of noise are introduced to cause the image quality to decline. Among them, salt and pepper noise is one of the common noises. The ability to effectively remove salt and pepper noise plays an important role in image segmentation and image feature recognition. The traditional method of processing salt and pepper noise uses image-related parameters to detect and eliminate noise, but while removing noise, it also modifies the gray value of non-noise pixels, and the calculation time is longer. Summary of the invention [0003] In order to solve the problems in the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T5/00
Inventor 杨捷齐冬莲何海明吴越闫云凤顾弘
Owner ZHEJIANG UNIV
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