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A Prototype Optical Tracking System Investigation and Development - page 158 / 170

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144

Communications Packets

Field Name

Field

Field

Type

Size in

Bits

Field Description

Destination ID Timestamp

The Soft Hub’s ID.

n integer representing the time that the packet was constructed.

Integer Integer

8 32

Sender ID Packet ID Centroid ID ROI X

The module’s ID.

Integer

8

‘C’ for centroid.

Character

8

unique ID for the centroid.

Integer

16

The X co-ordinate of the upper left corner of the

Integer

16

ROI (pixels).

ROI Y

The Y co-ordinate of the upper left corner of the ROI (pixels).

Integer

16

X Numerator

The numerator in the fraction that describes the

Integer

32

X coordinate, i.e., X =

X Numerator Pixel Sum

.

Y Numerator

The numerator in the fraction that describes the

Integer

32

Y coordinate, i.e., Y =

Y Numerator Pixel Sum

.

Pixel Sum

The sum of pixel values that are above the signal threshold within the ROI.

Integer

32

Pixel Count

The number of pixels that are above the signal threshold in the ROI.

Integer

16

ROI Width ROI Height Max

The ROI width (pixels). The ROI height (pixels).

The maximum pixel intensity of the marker image.

Integer Integer Integer

8 8 8

Field

Field

Type

Size in

Bits

String

N/

Data

The information in a text format.

F.2

Information Packet (INFO)

Sent by modules to the hub to transfer a) debug information b) text to the user.

Fields:

Field Name

Field Description

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