Speckle noise filtering method for optical coherence sectional image

A technology of optical coherence tomography and speckle noise, which is applied in the field of medical imaging technology and optical image information processing, can solve the problems of medical diagnosis difficulty, unclear image, and destroy image edge features, etc., and achieve simple mathematical expression and calculation efficiency High, the effect of saving calculation time

Inactive Publication Date: 2017-01-25
TIANJIN UNIV
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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 transmissi

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  • Speckle noise filtering method for optical coherence sectional image
  • Speckle noise filtering method for optical coherence sectional image
  • Speckle noise filtering method for optical coherence sectional image

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[0037] The present invention is to perform noise reduction processing on images obtained by optical tomography coherence imaging technology, so first explain the principle of optical coherence tomography, the principle of optical coherence tomography is as attached figure 1As shown, the optical tomography coherence imaging technique uses 820nm near-infrared light (invisible) emitted by superluminescent diodes to scan the retina, and generates a cross-sectional image of the tissue by recording the contrast curve of the scattering profile and the depth of each lateral position in the beam. Scattering profiles were measured by interfering light from a variable-length reference arm of a fiber-optic Michelson interferometer using back-scattered light from tissue. Retinal thickness and RNFL thickness were calculated by processing the generated OCT cross-sectional images. The generated image with speckle noise is attached as figure 2 shown.

[0038] Next, apply the filtering metho...

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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...

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Application Information

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IPC IPC(8): G06T5/00
CPCG06T5/002G06T2207/10101G06T2207/20016G06T2207/20182G06T2207/30041
Inventor 唐晨李碧原苏永钢陈霞
Owner TIANJIN UNIV
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