Real-time content-aware image resizing

Content-aware image resizing is a kind of new and effective approach for image resizing,which pre-serves image content well and does not cause obvious distortion when changing the aspect ratio of images. Recently,a seam based approach for content-aware image resizing was proposed by Avidan and Shamir. Their results are impressive,but because the method uses dynamic programming many times,it is slow. In this paper,we present a more efficient algorithm for seam based content-aware im-age resizing,which searches seams through establishing the matching relation between adjacent rows or columns. We give a linear algorithm to find the optimal matches within a weighted bipartite graph composed of the pixels in adjacent rows or columns. Therefore,our method is fast (e.g. our method needs only about 100 ms to reduce a 768×1024 image’s width to 1/3 while Avidan and Shamir’s method needs 12 s). This supports immediate image resizing whereas Avidan and Shamir’s method requires a more costly pre-processing step to enable subsequent real-time processing. A fast method such as the one proposed will be also needed for future real-time video resizing applications.