Matching of a sketches with an original photos

The problem of automatic photo-sketchmatching is discussed. Methods for generation a sketches population from the initial sketch to improve the performance of sketch-based photo image retrieval systems is proposed. A method to increase the index of similarity in pairs sketch-photo based on computation of an average sketch from the generated population is provided. It is shown that such sketches are more similar to original photo images and their use in the discussed problem may lead to good results.