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Improved P-G rapid method for removing interference noise

An interference noise, P-G technology, applied in image data processing, instrumentation, computing and other directions, can solve the problems of different imaging environments and cannot be used directly, and achieve the effect of solving edge blur and dim brightness, and improving signal energy reduction.

Inactive Publication Date: 2016-09-21
HARBIN ENG UNIV
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Problems solved by technology

The imaging mechanism and imaging environment of sonar images and traditional optical images are different, and the latter method cannot be used directly

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  • Improved P-G rapid method for removing interference noise
  • Improved P-G rapid method for removing interference noise

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings.

[0035] The invention provides a sonar image restoration method based on the improved Papoulis-Gerchberg algorithm. Aiming at the shortcomings of the P-G algorithm applied to the ideal two-dimensional filter resulting in blurred edges and dark brightness of the restored image, an improved fast P-G algorithm is proposed. First, assuming that there is prior knowledge of the location information of noise points or interference points, the pixel values ​​of these noise points are filled with mean filtering as the initial value, and the filled image is passed through a smoother frequency domain low-pass filter to replace the original There is an ideal frequency-domain low-pass filter, which is intended to retain part of the high-frequency information; since the pixel values ​​of those non-noise points and non-interference points are also changed after passing through the fil...

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Abstract

The present invention belongs to the field of the digital image processing, and relates to an improved P-G rapid method for removing interference noise. The method comprises: performing gray conversion of an original image, and removing the color of the image; performing marking of the non-noise point in the image; storing the non-noise point into the number group; setting the original value of the noise points and other interference points in the image as a mean value; and setting a cut-off frequency according to the frequency domain of the image, replacing an original frequency domain low pass filter with a smooth frequency domain low pass filter, and maintaining partial high-frequency information. The Improved P-G rapid method for removing interference noise is applied to the field of image denosing to maintain the partial high-frequency information through designing the smoother filter and improve the condition of the reduced signal energy in the filtering process so as to solve the deficiencies of the original P-G algorithm of fuzzy edge and dark brightness after restoration.

Description

technical field [0001] The invention belongs to the field of digital image processing. Specifically, an improved P-G fast method for removing interfering noise. Background technique [0002] Sonar systems have been widely used in various underwater equipment, especially in military ships, and are the main means for them to obtain target information. The sonar image is the visual information of the target echo. Due to the complexity of the ocean environment, various noises in the ocean pollute the sonar image, which brings difficulties to the follow-up analysis work. Therefore, effective noise removal becomes an accurate acquisition of information. necessary work. The imaging mechanism and imaging environment of sonar image and traditional optical image are different, and the latter method cannot be used directly. [0003] Median filter, which is a commonly used nonlinear smoothing filter, its basic principle is to replace the value of a point in a digital image or digital...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00
CPCG06T2207/20024G06T2207/10024G06T5/70
Inventor 卞红雨陈奕名徐扬
Owner HARBIN ENG UNIV
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