publication . Part of book or chapter of book . Other literature type . 2009

Efficient 2-D DCT Computation from an Image Representation Point of View

G.A. Papakostas; D.E. Koulouriotis; E.G. Karakasis;
Open Access English
  • Published: 01 Dec 2009
  • Publisher: InTech
Discrete Cosine Transform (DCT) constitutes a powerful tool in signal processing, since its first introduction (Ahmed et al., 1974). It belongs to a class of mathematical operations that includes the well-known Fast Fourier Transform (FFT), having as basic operation taking a signal and transforming it from one type of representation to another. More precisely, DCT transforms a signal from the spatial domain to the frequency space, with minimum information redundancy, since its kernel functions (cosines) comprise an orthogonal basis. The main advantage of the DCT transform is its high energy compactness and thus the resulted DCT coefficients fully describe the si...
free text keywords: Algorithm, Image compression, Theoretical computer science, Feature extraction, JPEG, computer.file_format, computer, Signal processing, Computer science, Image processing, Digital watermarking, Fast Fourier transform, Discrete cosine transform
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Part of book or chapter of book . 2009
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