Speckle noise filtering method for optical coherence sectional image

Abstract

The invention belongs to the field of medical imaging technologies and optical image information processing, and provides a speckle noise filtering method for an optical coherence sectional image. The speckle noise filtering method for the optical coherence sectional image aims to improve visual quality of the image, reduces influences of speckle noises to the image and can carry out filtering noise reduction treatment on the optical coherence sectional image. According to the technical scheme, the speckle noise filtering method for the optical coherence sectional image comprises the following steps: step 1, inputting an optical coherence sectional image f; step 2, carrying out logarithm taking operation on the coherence sectional image; step 3, carrying out shearlet transform on the image to obtain shearlet coefficients after logarithm is taken; step 4, carrying out hard threshold operation on the obtained shearlet coefficients Sj, l, x and y; step 5, carrying out shearlet inverse transform on retained parts after hard threshold operation is carried out to achieve the purpose of filtering; and step 6, outputting the filtered image. The speckle noise filtering method for the optical coherence sectional image is mainly used for processing optical image information.

Description

technical field [0001] The invention belongs to the fields of medical imaging technology and optical image information processing, and relates to a novel speckle noise filtering method for optical coherence tomography images. Background technique [0002] Optical coherence tomography is an emerging imaging technology, which was first proposed by the research team of the Massachusetts Institute of Technology in 1991. After more than 20 years of continuous improvement and perfection, it has now become an effective imaging technology. An imaging method with unique advantages and broad application prospects. The principle of optical coherence tomography utilizes the low coherence characteristics of broadband light sources to achieve high-resolution optical tomography, which can image strongly scattering media including biological tissues[1-4]. Optical coherence tomography has attracted extensive attention of researchers for its advantages of non-invasiveness, high resolution an...

AI Technical Summary

Problems solved by technology

[0003] However, in the optical coherence tomography system, low-coherence light sources, optical scanning mirrors, etc. will bring speckle noise, and the signal will also be polluted by noise during the actual acquisition, acquisition and transmission process, which affects image vision. Observed

Due to the noise interference in the image, these make the image unclear, destroy the edge features of the image, and even make the image unrecognizable, which brings difficulties to medical diagnosis.

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