Automated coronal hole segmentation from Solar EUV Images using the watershed transform.

•After the seed is indicated, the segmentation process progresses automatically.•A new algorithm for merging regions into the output mask of the coronal hole.•The average time of segmentation of a single coronal hole is 342ms.•Based on the experiments completed, Dice’s index averages 89%.•High accuracy of segmentation results for coronal holes of irregular shape.