OCT (Optical Coherence Tomography) image speckle noise reducing algorithm based on adaptive bilateral filtering
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A speckle noise, bilateral filtering technology, applied in the field of OCT image processing, can solve the problems of unsatisfactory speckle reduction effect, difficult construction, noise patches, etc. in OCT images, and achieve clear image edge details and reduce speckle. Speckle noise, the effect of improving edge contrast
What is AI technical title?
AI technical title is built by PatSnap AI team. It summarizes the technical point description of the patent document.
A speckle noise, bilateral filtering technology, applied in the field of OCT image processing, can solve the problems of unsatisfactory speckle reduction effect, difficult construction, noise patches, etc. in OCT images, and achieve clear image edge details and reduce speckle. Speckle noise, the effect of improving edge contrast
CN102800064BActive 📅 Publication Date: 2015-02-04NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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[0050] The technical scheme of the present invention is described in detail below in conjunction with accompanying drawing:
[0051] First, the formation mechanism of speckle noise in OCT image reconstruction is analyzed: speckle is a diffraction pattern with irregularly distributed granular structure formed by the interference of light vibrations scattered by different particle planes when they meet in space. The OCT signal is extracted through the coherence gate, which excludes a large amount of stray light and other levels of light, and only the optical path difference with the reference light is within the coherence length L c The scattered light within the range can interfere with the reference light to become an OCT image signal, and the speckle of the OCT image is also formed by these scattered light that meets the coherent conditions. The phase difference between each coherent light Where k is a constant, Δz=[0.5-(L c / n-0.5)] μm, λ 0 is the central wavelength of t...
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Abstract
The invention discloses an OCT (Optical Coherence Tomography) image speckle noise reducing algorithm based on adaptive bilateral filtering. The algorithm comprises the following steps of: establishing a speckle noise model of an original OCT image; establishing a space function by taking the speckle noise model of the original OCT image as a variable according to the Rayleigh criterion; and analyzing the characteristics of the space function and deducing a formula for adaptive correction of a filtering weight coefficient W[k, i] by the space function. The OCT image speckle noise reducing algorithm based on adaptive bilateral filtering disclosed by the invention can reduce the speckle noise of OCT image, reduce the mean square error of image and increase the peak signal-to-noise ratio; and meanwhile, the algorithm remarkably maintains the edge information of the image, increases the edge contrast and obtains clearer image edge details.
Description
technical field [0001] The invention relates to an OCT image speckle noise reduction algorithm based on adaptive bilateral filtering, and belongs to the field of OCT image processing. Background technique [0002] Optical coherence tomography (Optical Coherence Tomography, OCT) is a broadband optical scanning tomography technology developed in recent years, which uses the low coherence of broadband light sources to achieve high-resolution, non-invasive optical tomography. The exploration of OCT technology began in the late 1980s. In 1988, A.F.Fercher et al. used low-coherence interferometers for intraocular measurements. In 1991, D.Huang and others proposed the concept of OCT, and obtained retinal images with this technology. Subsequently, research groups around the world have conducted many fruitful researches on OCT technology in terms of improving image resolution and signal-to-noise ratio. At present, the resolution of OCT technology can generally reach more than ten m...
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