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Directional pyramid filtering-based image processing method and device

An image processing device and image processing technology, applied in image data processing, image enhancement, instruments, etc., can solve the problems of huge, image information distortion and calculation amount, and achieve the effect of small calculation amount

Inactive Publication Date: 2013-02-27
成都晶石石油科技有限公司
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Problems solved by technology

[0015] In order to overcome the technical problems of image information distortion and huge amount of calculation existing in image signal denoising in the prior art, the present invention provides an image processing method based on directional pyramid filtering

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  • Directional pyramid filtering-based image processing method and device
  • Directional pyramid filtering-based image processing method and device
  • Directional pyramid filtering-based image processing method and device

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Embodiment Construction

[0060] The image processing method based on direction pyramid filtering of the present invention comprises the following steps,

[0061] Step 1. Perform Fourier transform on the input image signal XIN to output the image signal A 1

[0062] Step 2. For image signal A 1 , respectively through the low-pass filter bank (L 0 …L M-1 ) of the first two low-pass filters L 0 and L 1 , get the filtered image signal P 0 , P 1 , the low-pass filter bank (L 0 …L M-1 ) The bandwidth of the passband of each low-pass filter in ) is proportionally decreasing;

[0063] Step 3. Use P 1 minus P 0 Get image signal VB 1 , the image signal VB 1 respectively through the directional filter bank (B 0 …B N ), and then undergo inverse Fourier transform to obtain N+1 band-pass filtered image signals Q 00 ~Q 0N ;

[0064] Step 4. comprises M-2 following cycle steps:

[0065] Starting from m=2, the image signal P of the previous step m-1 Pass the m+1th low-pass filter L of the low-pass ...

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Abstract

The invention discloses a directional pyramid filtering-based image processing method, which comprises the following steps of: after performing Fourier transform on an input image signal XIN, performing scale decomposition of image signal subtraction through a low pass filter set (L0 ellipsis LM-1), subsequently performing directional filtering through a directional filter set (B0 ellipsis BN); then performing inverse Fourier transform to obtain a series of image signals of all directions and scales and a coarse scale image signal; and adding the signals to obtain a final output image signal. In addition, the invention also provides an image processing device for realizing the method. According to the directional pyramid filtering-based image processing method and device, a pyramidal filter with controllable direction is adopted, translation invariance and rotation invariance are realized, multi-scale decomposition is performed on the images freely, a filter of an all-directional angle is obtained by combining basic filters, all-directional filtering of the images is realized, and the calculation quantity is relatively small.

Description

technical field [0001] The invention belongs to the field of image signal processing, and relates to an image processing method and device based on directional pyramid filtering Background technique [0002] At present, the existing image denoising methods can be roughly divided into two categories: (1) Spatial domain methods. In the spatial domain, various smooth templates are used to convolve with the image, so as to suppress or eliminate noise; (2) Transform domain method. After various transformations are performed on the image, an appropriate frequency bandpass filter is selected for filtering. The theoretical basis is that the signal is mainly distributed in the low-frequency part, while the noise is mainly distributed in the high-frequency part, and the high-frequency part of the signal can be filtered out. noise. But for the image, the detail signal of the image is also located in the high-frequency part. While filtering out the high frequency, it also destroys the...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
Inventor 刘力辉
Owner 成都晶石石油科技有限公司
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