1. A method of coding video content, comprising: coding at least one picture within the video content, coding the picture comprising: within the picture, identifying a first plurality of image blocks based on at least a first image characteristic that is common to each of the first plurality of image blocks; dynamically defining a first image block group to comprise the first plurality of image blocks; selecting at least one of the first plurality of image blocks as a predictor block for the first image block group; for each of the other image blocks in the first image block group, predicting a respective second image characteristic that corresponds to a second image characteristic associated with the predictor block; and outputting the coded picture.