Method of segmentation of overlapping blood cells on microscopic medical images
DOI:
https://doi.org/10.18413/2687-0932-2020-47-4-803-815Keywords:
erythrocytometry, computer vision, blood microscopic image, overlapping objects, concave points, curvature analysis, elliptical objectAbstract
The article discusses the solution to the problem of erythrocytometry using computer vision methods. To carry out erythrocytometry, it is necessary to isolate erythrocytes on a microscopic image of blood and then calculate their parameters such as diameter, volume and thickness. The main problem when calculating the areas of red blood cells is that they can overlap each other, and also change their shape in a certain range. At the first stage, the proposed approach provides for the preprocessing of microscopic images of blood cells. Then, the outline of a group of overlapping objects is divided into many segments, separated by special points, the so-called concave points. A combined approach is proposed for extracting contour evidence, which is based on the detection of concave points using curvature analysis, the use of concavity testing and an efficient search procedure. It is then suggested to use the segment grouping method to find a group of path segments that together form an elliptical object. Segment grouping means iterating over preselected contour segments in order to be able to combine them into a single closed object. The testing of the segmentation algorithm for overlapping erythrocytes in microscopic images on 24 real microscopic medical images of blood showed the effectiveness of the developed method.
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