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A method for filtering image mixed noise

A technology of image mixing and noise mixing

Inactive Publication Date: 2007-12-12
程桂花
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Problems solved by technology

However, the same group filtering cannot effectively remove the impulse noise of the image, and at the same time, the calculation amount is very large when classifying the members of the same group of each pixel, especially when the filter window is selected larger, the denoising speed is extremely slow , so this method is not suitable for real-time image processing

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  • A method for filtering image mixed noise
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  • A method for filtering image mixed noise

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Embodiment Construction

[0016] The method of the present invention will be described below in conjunction with the accompanying drawings and embodiments. FIG. 1 is an overall flow chart of the method for filtering mixed image noise proposed by the present invention.

[0017] Step 1: Select the first pixel in the input original image with mixed noise.

[0018] Step 2: Determine whether the pixel belongs to impulse noise. The method of discrimination can usually distinguish the impulse noise by calculating the feature difference value (such as grayscale, RGB value, etc.) Whether the pixel is impulsive noise. In this embodiment, it is described by taking the determination of whether the pixel is impulse noise according to the local energy feature of the pixel as an example. The local energy feature of a pixel mainly describes the local differential information of the pixel’s feature value in multiple directions such as horizontal and vertical. Usually, the local energy value of a pixel corresponding t...

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Abstract

The invention discloses a method of filtering image mixed noise, it includes step 1: selecting input first pixel in original image which includes mixed noise; step 2: judging whether the pixel belongs to pulse noise, if it is, enter step 3. if else enter step 4; step 3: the pixel is median filter processed to filter the pulse noise, then enter step 6; step 4: ensuring the members of the un-pulse noise pixel; step 5: gauss noise is filtered by filter; step 6: checking whether the all pixels are processed, if it is not, the next pixel is fetched, then turn to step 2; if it is, new image whose mixed noise is filtered is output. The method can filter mixed noise in image, at the same time edge and detail information of image can be protected well, and calculation speed is high.

Description

Technical field: [0001] The invention relates to a method for filtering out image mixed noise in the field of image processing, in particular to filtering out image noise in the field of real-time image processing. Background technique: [0002] In the field of image processing, the filtering of image noise is very important for subsequent image processing. Among the existing commonly used image denoising methods, the Gaussian filter method is more effective for filtering Gaussian noise of the image, but at the same time it is easy to damage the edge information of the image, thus making the image blurred. The median filtering method can filter out the impulse noise of the image very well, but it is not effective for filtering the Gaussian noise of the image. The common defect of both is that all neighboring pixels in the filtering window are processed in the same way, which will introduce errors and lead to the damage of image edge and detail information. [0003] The sam...

Claims

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Application Information

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IPC IPC(8): H04N5/21H04N5/213
Inventor 曹刚徐立峰罗宏宇
Owner 程桂花
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