VD5377 datasheet(32/88 Pages) STMICROELECTRONICS

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Key features

VD5377

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Doc ID 022952 Rev 2

Table 17. Features and scaling

Addr

(Hex)

Signal name

Bit

Type

Default

(Hex)

Comment

MIN_FEATURES

min_features

7:0 PRW

This register represents the

minimum feature count below which

motion is inhibited. Multiply by 16 to

get the actual feature count

threshold. Default is 16d x 16 =

256.

X_SCALING

motion_x_scaling

7:0 PRW

Scaling for X motion vectors.

Resolution is calculated as register

value x 100 x M, where M is the

lens magnification.

So, for M = 0.5:

0x08 = 400 CPI that is 8 x 100 x 0.5

0x0c = 600 CPI that is 12 x 100 x

0.5

Y_SCALING

motion_y_scaling

7:0 PRW

Scaling for Y motion vectors.

Resolution is calculated as register

value x 100 x M, where M is the

lens magnification.

So, for M = 0.5:

0x08 = 400 CPI that is 8 x 100 x 0.5

0x0c = 600 CPI that is 12 x 100 x

0.5

FEATURES

features_report

7:0 PR

Feature count report, as the SUM of

absolute differences between pixels

and the field average. Bits [11:4] are

represented here so x16 to

calculate the actual feature count.

Maximum value is 4080 = 255 x 16.

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