Discrete 2-D Fourier Transform
The theory of the continuous-time and discrete-time Fourier transformations has been well developed. The discrete Fourier transform has become a powerful technique in signal processing, and in particular in image processing. Effective methods, or fast algorithms, [1]-[6], of the discrete Fourier transforms (DFT) are used for solving many problems in image processing in the frequency domain, such as image filtration, restoration, enhancement, compression, and image reconstruction by projections [7]-[10]. Other unitary transformations are also used in signal and image processing. Considerable interest is given to many applications of the discrete Hartley transformation (DHT), since it relates closely to the DFT ...
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