Method and system for removing stripe noise on the basis of Wavelet transform and Fourier transform

Abstract

The present invention discloses a method and system for removing stripe noise on the basis of the Wavelet transform and the Fourier transform. An original image is subjected to the Wavelet transform to break up the two-dimensional original image into highpass / lowpass filtering characteristics in different directions, and detailed images of multiple directions of each layer are obtained; the detailed images of each layer are divided into noise direction detailed images and non-noise direction detailed images according to the actual direction of the stripe noise in the original image, and the noise direction detailed images in the detailed images of each layer are extracted; the noise direction detailed images are subjected to localization processing through the adoption of the Wavelet transform, the noise direction detailed images of each layer are converted to superposition sum of each frequency component mode, and magnitude spectra of the noise direction detailed images of each layer are obtained; and high-frequency signals with a certain width in each magnitude spectrum are filtered, and the stripe noise with a target width is removed. According to the invention, the stripe noise with any angle is effectively removed in the condition without the addition of the time complexity and the computation complexity and on the basis of completely unaffected image quality.

Description

technical field [0001] The invention relates to the field of fringe noise filtering, in particular to a method and system for removing fringe noise based on wavelet transform and Fourier transform. Background technique [0002] Streak noise is a relatively common noise, which is a kind of noise distortion. It is manifested as "traces" that do not belong to the image in a certain part or several parts of the image, such as figure 1 shown. Streak noise in pictures or videos will have different degrees of impact on people's life and work. The generation of streak noise is mainly due to poor contact and electromagnetic interference, which lead to periodic superimposed streak noise in the image, and what is visually shown is a straight line with mixed colors. For example, when a computer is playing a video, if there is mobile phone signal interference around it, it will often cause stripes in the middle of the played video. [0003] However, stripe noise mainly manifests in th...

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Problems solved by technology

[0006] The purpose of the present invention is to overcome the deficiencies of the prior art, aiming at the characteristics of streak noise, provide a streak noise removal method and system based on wavelet transform and Fourier transform, which solves the inevitable image degradation in the traditional streak noise removal method. quality problem, the present invention can effectively remove the fringe noise at any angle without increasing the time complexity and computational complexity, and on the basis of hardly affecting the image quality

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