The particle size largely determines the properties of dispersed materials. It is a key parameter for equipment performance evaluation. The measurement process is substantially complicated by the presence of aggregated structures. Purpose. To develop complex method for evaluating geometrics of emulsion drops and other dispersed formations of spherical particles considering their aggregation. The method is based on aggregate structure and contours, using marking of analyzed objects. Methodology. The method includes several steps: image filtering, converting it to a monochrome mode, evaluating the aggregate contour, correcting the contour, setting particle markers according to glares on particle surfaces, making the skeleton, determinating connecting points. To decompose aggregate fragments containing several markers, aggregate's area is distributed between the particles according to the Voronoi diagram. Parameters of circles corresponding to particles are evaluated from geometrics of corresponding aggregate fragments. The method is illustrated by the images of real emulsion fragments (type II emulsions - water in oil). Findings. The developed method allows realizing segmentation of complex structured aggregates, consisting of many spherical particles, containing internal objects whose contour is located entirely inside the aggregate. The number of incoming particles is not limited. Originality. The developed method of aggregate segmentation (emulsion drops) is noise-resistant and allows segmenting the aggregates of a complex structure by evaluation of connecting points of its particles, according to the aggregate structure and by marking the particles when evaluation of connecting points with the necessary precision is impossible (in case of a small convexity defect or presence of internal particles). The glares on particle surfaces may serve as markers. Practical value. The method may be used to evaluate dispersity of emulsions and other finely divided materials at various industries.

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