Discrete (co)sine transform (and its inverse) 1.0

Date Added: June 08, 2013 | Visits: 295

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Y = DCTN(X) returns the discrete cosine transform (DCT) of X.X = IDCTN(Y) returns the inverse discrete cosine transform (IDCT) of Y.Y = DSTN(X) returns the discrete sine transform (DST) of X.X = IDSTN(Y) returns the inverse discrete sine transform (IDST) of Y.X and Y can be N-dimensional.D = DSTMTX(k) returns the k-by-k DST transform matrix.Enter "help dctn", "help dstn", "help idctn", "help idstn" and "help dstmtx" in the Matlab command window for complete information.Example-------RGB = imread('autumn.tif');I = rgb2gray(RGB);J = dstn(I);imshow(log(abs(J)),[]), colormap(jet), colorbar The commands below set values less than magnitude 10 in the DST matrix to zero, then reconstruct the image using the inverse DST. J(abs(J)

Requirements: No special requirements

Platforms: Matlab

Keyword: Colorbar, Colormapjet, Commands, Dstni, Imread Autumntif, Imshowlogabsj, Information, Rgb Grayrgb

Users rating: 0/10

License: Shareware

Size: 10 KB

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