The following Matlab project contains the source code and Matlab examples used for discrete cosine transform based image fusion techniques. Image fusion using DCT based demo programme is presented.

The following Matlab project contains the source code and Matlab examples used for type ii inverse dct (i.e. type iii dct) . This code does the same as matlab's idct with a few improvements: 1) on the first call, it's a bit faster than the builtin idct 2) on subsequent calls, due to persistent variables, it's about 2x or more faster than the builtin idct, and only about 1.

The following Matlab project contains the source code and Matlab examples used for dct 8x8 basis functions. Plot DCT 8x8 Basis Functions

The following Matlab project contains the source code and Matlab examples used for dct and dst (+ inverse) in arbitrary dimension. Y = DCTN(X) returns the discrete cosine transform (DCT) of X.

The following Matlab project contains the source code and Matlab examples used for two types dct ii, dct iv and dst ii, dst iv. these two functions are used to transform array of data into: 1- DCT-II or DCT-IV 2- DST-II or DST-IV

The following Matlab project contains the source code and Matlab examples used for multidimensional discrete cosine transform (dct). The function is much faster than Matlab's native (dct, idct, dct2, idct2).

The following Matlab project contains the source code and Matlab examples used for directional discrete cosine transform. DDCT is demonstrated with different block size and different modes. The details algorithm can be referred at http://link.springer.com/article/10.1007/s12596-013-0148-7?no-access=true VPS Naidu "Hybrid DDCT-PCA based multi sensor image fusionJournal of Optics", Volume 43, Issue 1, pp 48-61, March 2014,    

The following Matlab project contains the source code and Matlab examples used for resize any arrays and images. Y = RESIZE(X,NEWSIZE) resizes input array X using a DCT (discrete cosine transform) method.

The following Matlab project contains the source code and Matlab examples used for 16 point radix 2 dif fft . Contain the computation of 16 point DIF FFT in each stages and reordering process.

The following Matlab project contains the source code and Matlab examples used for 2 d dct idct for jpeg compression. to understand the Algorithm go to matlab help in page dct2 and idct2 to get the mathematical expression for M = N = 8, we can calculate the most of hard values and save it as LUTs to speed up the execution now compare our special 8X8 functions with the internal general functions use this code: A = int32(100*rand(8,8)); tic;for i = 1 : 1000 IDCT_8X8(DCT_8X8(A));end;toc; tic;for i = 1 : 1000 idct2(dct2(A));end;toc;

The following Matlab project contains the source code and Matlab examples used for jpeg compression (dct). In this code, Run Length Encoding is used to compress the Normalized DCT Coefficients, and corresponding Decoding techniques are used to decompress the image.

The following Matlab project contains the source code and Matlab examples used for directional discrete cosine transform and principal component analysis based image fusion. Image fusion algorithm based on DDCT and PCA is demonstrated. The reference is: VPS Naidu, "Hybrid DDCT-PCA base multi sensor image fusion”, Journal of Optics, Vol. 43, No.1, pp.48-61, March 2014.

The following Matlab project contains the source code and Matlab examples used for discrete cosine transform vs discrete wavelet transform. This paper deals with the JPEG Encoder for image compression upon comparing the performance of DWT compression with DCT compression.

The following Matlab project contains the source code and Matlab examples used for dft & dct. Code provided here works for 1-D signal. If you want to process it for 2-D signal (ex. GrayScale Image) first process the signal row wise and after that column wise.

The following Matlab project contains the source code and Matlab examples used for dct implemetation using fft.. The program uses fft and calculates the DCT. This is relatively slower than the original DCT [Built-in], but this is open source DCT Implementation.