PatchSwapper: A novel real-time single-image editing technique by region-swapping.

•We design a special image-editing tool explicitly for seamlessly swapping regions (transformed or fixed) in a single image.•A novel graph algorithm is used to search for the best closed cut. A Poisson blending is applied to further reduce artifacts.•A CPU multi-thread implementation achieves real-time performance even for large patches (e.g. size=350*350).•User can draw arbitrary boundaries to indicate two regions to be entirely exchanged after swapping (please see our video).•A patch location recommendation algorithm is proposed to help user find out potential exchangeable regions existing in image.