I have been reading the paper entitled Measures of Similarity by Unnikrishnan and Herbet, in which they discuss some metrics to evaluate image segmentation. They use the word refinement of labels/segmentations/images in different places. However, it is unclear to me what this means, and an online search for "image refinement" does not bring much enlightenment.
I hope someone can elaborate a bit on the meaning of refinement in the context of images, or more specifically if possible, in the context of image segmentation.
Thank you in advance!