STV-974/552S-R01 STMicroelectronics, STV-974/552S-R01 Datasheet - Page 16

• Manufacturer Part Number: STV-974/552S-R01
• Description: KIT DEMO W/VS6552
• Manufacturer: STMicroelectronics

Specifications of STV-974/552S-R01

• Sensor Type: CMOS Imaging, Color (RGB)
• Sensing Range: VGA
• Interface: I²C
• Sensitivity: 30 fps
• Embedded: No
• Utilized Ic / Part: STV0974E, VS6552
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: 497-3891

STV0974
4.4.2
4.4.3
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:
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.
Figure 8: ZigZag block sequence re-ordering
with
C u ( ) C v ( )
C u ( ) C v ( )
F u v ,
(
,
,
)
=
--- -
N
2
=
=
17 18 19 20 21 22 23 24
25 26 27 28 29 30 31 32
41 42 43 44 45 46 47 48
41
49 50 51 52 53 54 55 56
57 58 59 60
33 34 35 36 37 38 39 40
×
1 2 3
9 10 11 12 13 14 15 16
Input data sequence
1
------ -
1
x
2
7
=
∑
0
∀
y
(
4 5 6 7 8
=
u v ,
7
∀
∑
(
0
u v ,
61
C u ( ) C v ( )
)
¼
62 63 64
)
0
=
0
f x y ,
(
)
cos
(
--------------------------- -
2 x
+
16
1
10
11
21
22
36 37
1 2
3
4
) u π
12
20
23
35
Output data sequence
5
9
cos
13
19
24
34
38
49 50
6 7
8
(
--------------------------- -
14
18
25
33
39
48
2 y
15 16
17
26
32
40
47
51
58 59
+
16
1
27
31
41
46
52
57
) v π
28 29
30
42
45
53
56
60
63 64
Functional description
43
44
54
55
61
62
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