Discrete cosine transform This has formed the basis
Discrete cosine transform This has formed the basis of all the popular video compression codecs. The picture is divided into regular blocks, and then the transform is applied block by block. The original coding schemes chose a basic block of 8 8, that is, 64 pixels. MPEG-4 introduced variable block sizes. 84 The Technology of Video and Audio Streaming Normalization & quantization block of pixels DCT frequency coefficients 8 8 8 8 horizontal frequency vertical frequency quantized coefficients with zigzag scanning 8 8 start end horizontal frequency vertical frequency X Y Figure 5.2 Discrete cosine transform.
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