VD5377 datasheet(41/88 Pages) STMICROELECTRONICS

41 / 88 page

Doc ID 022952 Rev 2

41/88

VD5377

Additional features

7.2

Adaptive CPI

To be able to cope with large screen resolution an adaptive CPI functionality has been

implemented in VD5377, where the motion scaling can be adjusted depending on the speed

of the detected motion.

The algorithm is shown in Figure 17 where maximum motion is max_abs_motion (register

0x2f).

Figure 17. Adaptive CPI algorithm

motion scaling

(CPI)

max_motion

adaptcpi_min_motion

adaptcpi_min_scaling

reg 0x36

reg 0x35

adaptcpi_log_motion_range

reg 0x37 [2:0]

adaptcpi_log_scaling_range

reg 0x37 [6:4]

blue: adaptive CPI register control

legend

purple: default values

25=32

24=16

(1 pixel/32)

Table 25. Adaptive CPI

Addr

(Hex)

Signal name

Bit

Type

Default

(Hex)

Comment

OVERFLOW

adapt_cpi_en

PRW

If set, the CPI is function of the

detected motion.

0 = No adaptive CPI

1 = Enable adaptive CPI

MAX_ABS_MOTION

max_abs_motion

6:0

Max(ABS(X motion), ABS(Y

motion)) either from integrated or

instant motion

ADAPTCPI_MIN_

MOTION

adaptcpi_min_

motion

7:0

PRW

Minimum value of max(|X frame

motion|, |Y frame motion|) from

which the CPI is adaptive (if

feature enabled) - multiply by 1/32

ADAPTCPI_MIN_

SCALING

adaptcpi_min_

scaling

7:0

PRW

Minimum motion scaling value

when adaptive CPI feature is

enabled.

VD5377 数据表(PDF) 41 Page - STMicroelectronics

VD5377 数据表(HTML) 41 Page - STMicroelectronics

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 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 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88

数据表下载