| 摘要 |
Device for fast parallel 2-D DCT (two-dimensional discrete cosine transformation) capable of performing a fast 2-D DCT by significantly reducing the number of multiplications while carrying out the 2-D DCT. An NxN two-dimensional input datum is rearranged into N groups in such a way as to have the same background (kernel, support) as the cosine function so as to transform a multiplication pattern (shape, form) of the cosine function (in the guise of background of a 2-D DCT) into a summation pattern. Then, the first few summations and subtractions are executed on the rearranged data. Thereby producing a first computed datum. Then, N 1-D DCTs are executed on the first few computed data. Finally, the 2-D DCT datum is produced by executing a shift procedure after having performed additions and subtractions on the 1-D DCT data in log2 N stages. <IMAGE>
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