Layer segmentation of coherent optical tomography images based on backtracking shortest path algorithm

Abstract

The invention discloses a layer segmentation method of a coherent optical tomographic image based on a backtracking shortest path algorithm. The method comprises the steps of: S1, performing de-noising processing on original images; S2, calculating the weights of all nodes in the image after removing noise to form a weight map; S3, defining the start point and the end point of the shortest path algorithm on the weight graph by adopting the method of automatically initializing the endpoint; S4, calculating and searching the minimum cumulative cost path between the start point and the end pointby using the shortest path algorithm with backtracking on the weight graph; S5, removing the auxiliary column added when the user-defined endpoint is added in the obtained minimum cumulative cost path, and obtaining a layer segmentation result of one layer in the coherent optical tomography image; restricting the image search area and repeating the above step S3-S5, finally obtaining the segmentation results of all layers in the coherent optical tomography image. The segmentation method avoids the short circuit problem in the traditional method and is suitable for the segmentation of normal and lesion-affected coherent tomography images. The method has high accuracy and flexibility.

Description

technical field [0001] The invention relates to the technical field of coherent optical tomographic image processing, in particular to a method for layer segmentation of coherent optical tomographic images based on a backtracking shortest path algorithm. Background technique [0002] OCT (Optical Coherence Tomography), also known as optical coherence tomography, is a new tomographic imaging technology with high resolution and the characteristics of tomographic imaging on the internal structure of organisms. OCT is able to obtain subsurface images at near microscopic resolution because it uses light waves as the detection method, rather than sound waves. Light waves have shorter wavelengths than sound waves and travel faster than sound waves. OCT is developed based on low-coherence interferometry, which has made great progress in recent decades. The first-generation OCT is also called time-domain OCT (TD-OCT), which collects 400 A-scan images per second with an axial resolu...

AI Technical Summary

Problems solved by technology

However, the traditional shortest path algorithm has a short-circuit problem. This invention proposes an improved shortest path algorithm with backtracking, which can effectively avoid the short-path problem and is suitable for segmented images of retinal lesion structures.

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