Jian-Jiun Ding, Ying-Wun Huang, Pao-Yen Lin, Soo-Chang Pei, Hsin-Hui Chen, Yu-Hsiang Wang. Two-Dimensional Orthogonal DCT Expansion in Trapezoid and Triangular Blocks and Modified JPEG Image Compression. IEEE Transactions on Image Processing, 22(9):3664-3675, 2013. [doi]
Abstract is missing.