Seam carving: Avidan, S., & Shamir, A. (2007). Seam carving for content-aware image resizing. In ACM SIGGRAPH 2007 papers (pp. 10-es). Poisson matting: Sun, J., Jia, J., Tang, C. K., & Shum, H. Y. (2004). Poisson matting. In ACM SIGGRAPH 2004 Papers (pp. 315-321).