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1 January 2008Two-dimensional discrete sine transform scheme for image mirroring and rotation
Mirroring an image (horizontally or vertically) and rotation by 90, 180, and 270 deg in the spatial domain is implemented by changing the signs of the 2-D discrete cosine transform (DCT) coefficients of the original image appropriately. This approach leads to an efficient compressed domain-based image mirroring and rotation. This method is now extended to a 2-D discrete sine transform (DST), i.e., a 2-D DST possesses properties similar to 2-D DCT and it can be applied to image mirroring (horizontally or vertically) and also rotation by angles of 90, 180, and 270 deg. We illustrate these methods in a video-editing application.
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Do Nyeon Kim, K. R. Rao, "Two-dimensional discrete sine transform scheme for image mirroring and rotation," J. Electron. Imag. 17(1) 013011 (1 January 2008) https://doi.org/10.1117/1.2885257