Image enhancing method based on frequency domain

An image enhancement and frequency domain technology, applied in the field of image enhancement based on frequency domain, can solve problems such as utility difficulties, and achieve the effect of low computational complexity, easy parallel processing, and intuitive deformation super-resolution mechanism.

Inactive Publication Date: 2015-12-09
CHENGDU RONGCHUANG ZHIGU SCI & TECH
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Problems solved by technology

In practice, finding an effective method requires extensive experimentation, and it is difficult to predict the utility of a specific method without prior knowledge of how a given image will be degraded.

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  • Image enhancing method based on frequency domain
  • Image enhancing method based on frequency domain
  • Image enhancing method based on frequency domain

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Embodiment Construction

[0041] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0042] A method for image enhancement based on frequency domain, comprising the steps of:

[0043] (1) Get the original image;

[0044] (2) Utilize the Fourier transform method to convert the image in the original image space to the frequency domain space; utilize the Fourier transform method to convert the image in the original image space to the frequency domain space. The specific steps are as follows:

[0045] (21) read the image;

[0046] (22) convert the image matrix format read;

[0047] (23) Transform the format-converted image matrix into the frequency domain with Boyier transform, that is, move the zero point to the center; the filtering in the frequency domain includes the following steps: ① Multiply the input image by (‐1)x+y to get Carry out center transformation; ②Calculate the DFT of the image after the centralization in step ①, that is,...

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Abstract

The invention discloses an image enhancing method based on frequency domain and belongs to the technical field of image enhancement methods. An image is regarded as a two-dimensional signal. Signal enhancement based on two-dimension Fourier transform is performed on the two-dimensional signal. By adopting the lowpass filtering method, i.e., just allowing low-frequency signals to pass, noise in pictures can be removed. By adopting the highpass filtering method, high frequency signals on edges can be increased, and vague pictures can become clear. The method comprises steps of 1) obtaining an original image; 2) switching images in the space of the original image to frequency domain space by means of the Fourier transformation; 3) using transition function to process images in the frequency domain space; and 4) after images in the frequency domain space is processed via the transition function, enhancing obtained images via inverse transformation. The image enhancing method is used for image processing.

Description

technical field [0001] An image enhancement method based on frequency domain is used for image processing and belongs to the technical field of image enhancement methods. Background technique [0002] Image enhancement refers to highlighting important information in an image according to specific needs, while weakening or removing unnecessary information. Images obtained from different channels, through appropriate enhancement processing, can process the original blurred or even indistinguishable original image into a clear and usable image rich in a lot of useful information, effectively remove the noise in the image, enhance Edges or other regions of interest in the image, making it easier to detect and measure objects of interest in the image. [0003] An early application of image enhancement was various processing of images sent back by spacecraft. In the 1970s, the application of image processing technology rapidly expanded from the aerospace field to various fields ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T3/00
Inventor 张岱齐弘文
Owner CHENGDU RONGCHUANG ZHIGU SCI & TECH
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