STV0974 datasheet(16/69 Pages) STMICROELECTRONICS

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STV0974

Functional description

4.4.2

Discrete Cosine Transform

This block performs a Discrete Cosine Transform on the incoming data stream. It is compliant with

ISO DIS 10918-1 Annex A - Section A.3.

The block processes each 8x8 input block to transform them into 8x8 DCT coefficients. The

calculation of the DCT coefficients is done by the formula:

4.4.3

Zigzag transform

This block is in charge of setting the DCT coefficients in a sequence that corresponds to an

increasing spacial frequency of the cosine function. It is compliant with ISO DIS 10918-1 Annex A -

Section A.3.6.

with

Figure 8: ZigZag block sequence re-ordering

Fu v

()

----

()Cv

()

∑

fx y

()

()uπ

----------------------------

()vπ

----------------------------

cos

() Cv

()

-------

()

∀

() Cv

()

∀

1 2

45678

9 10 11 1213141516

17 18 19 20 21 22 23 24

25 26 27 28 29 30 31 32

33 34 35 36 37 38 39 40

41 42 43 44 45 46 47 48

49 50 51 52 53 54 55 56

57 58 59 60

62 63 64

Input data sequence

15 16

28 29

36 37

49 50

58 59

63 64

Output data sequence

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