Median filtering image processing method and apparatus

A technology of filtering images and processing methods, which is applied in the field of image processing, and can solve problems such as poor visual effects, unclear images, and easy judgment errors

Active Publication Date: 2016-08-24
FUZHOU ROCKCHIP SEMICON
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Problems solved by technology

[0004] For this reason, it is necessary to provide a technical solution for median filter image processing, which is used to solve the problem of high algorithm comp...

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  • Median filtering image processing method and apparatus
  • Median filtering image processing method and apparatus
  • Median filtering image processing method and apparatus

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Embodiment Construction

[0041] In order to explain in detail the technical content, structural features, achieved goals and effects of the technical solution, the following will be described in detail in conjunction with specific embodiments and accompanying drawings.

[0042] see image 3 , is a flowchart of a median filter image processing method according to an embodiment of the present invention. The method can be used to well remove the discrete salt and pepper noise points in the noisy image while maintaining the high-frequency edges of the image. The method specifically includes the following steps:

[0043] First enter step S301 to input an N×N pixel matrix, where N is a positive integer greater than or equal to 3 and is an odd number. Such as figure 1 As shown, it is a 5x5 pixel matrix, which contains 5 rows and 5 columns with a total of 25 pixels. The coordinates corresponding to the first pixel are (1, 1) (the first row and the first column), the coordinates corresponding to the second ...

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Abstract

The invention discloses a median filtering image processing method and apparatus. The method includes the steps of inputting an NXN pixel matrix, calculating the absolute values of differences between the central pixel point of the pixel matrix and all other pixel points, sequentially determining whether the absolute values of the differences between the central pixel point of the pixel matrix and all other pixel points are greater than a first preset threshold, recording the number of pixel points, of which the absolute values of the differences with the central pixel point are greater than the first preset threshold, determining whether the number of the pixel points, of which the absolute values of the differences with the central pixel point are greater than the first preset threshold is greater than a second preset threshold, and if yes, conducting filtering processing for the central pixel point, otherwise conducting no filtering processing. Discrete impulse noise points in noised images can be removed through median filtering processing, thereby retaining high-frequency edges of the image, and facilitating processing of subsequent modules. A detection algorithm employing gradient determination effectively prevents deleting non-noise points by mistake.

Description

technical field [0001] The present invention relates to the field of image processing, in particular to a median filter image processing method and device. Background technique [0002] A large number of experimental studies have found that images captured by cameras are seriously affected by discrete pulses, salt and pepper noise, and zero-mean Gaussian noise. Noise brings many difficulties to image processing, and has a direct impact on image segmentation, feature extraction, and image recognition. Therefore, the images collected in real time need to be filtered. The operation of removing noise components in an image is called smoothing or filtering of an image. There are two purposes of filtering: one is to extract the characteristics of the object as the feature pattern of image recognition; the other is to meet the requirements of computer processing and eliminate the noise mixed in when the image is digitized. [0003] However, the existing filtering algorithms not ...

Claims

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/002G06T2207/10004G06T2207/20032
Inventor 张圣钦
Owner FUZHOU ROCKCHIP SEMICON
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