Teledyne Princeton Instruments PICam 5.x, Руководство программиста

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182 PICam™ 5.x Programmer’s Manual Issue 11
6.1 Data Format
By default, the data is returned as follows:
• One frame of sensor data containing each region of interest (in the order
defined);
• Followed by any metadata for that frame (timestamps followed by frame
tracking, gate tracking delay, gate tracking width, and modulation tracking);
• Repeated for each frame in one readout
• Possibly followed by any padding between readouts.
Acquired data is structured as shown in Figure 6-1 .
NOTE:
All partitions are specified in bytes.
Figure 6-1: Data Format Diagram
The hardware acquires N Readouts, each separated by one Readout Stride.
One Readout Stride is comprised of M frames, each separated by one Frame Stride
followed by padding.
One Frame Stride is divided into:
• Frame Pixel Data
Frame pixel data contains data for X Regions of Interest stored in the order in
which each ROI was defined.
• Frame Metadata by a frame size.
Frame Metadata contains any time stamps followed by:
— Frame Tracking Number;
— Gate Tracking Delay and Width;
— Modulation Tracking Duration, Frequency, Phase, and Output Signal
Frequency).
All formatting information is available as read-only data acquisition parameters.
Readout 2
Readout 1
…
Readout N
Readout Stride
Bytes
Frame 1
Data
Metadata
Frame 2
Data
Metadata
M
Frame
Metadata
Data
…
Padding
Frame Stride
Bytes
ROI 1
ROI 2
…
ROI X
Frame Size
Bytes
(Modulation Tracking Bit Depth + 7) / 8 Bytes
(Gate Tracking Bit Depth + 7) / 8 Bytes
(Frame Tracking Bit Depth + 7) / 8 Bytes
(Time Stamp Bit Depth + 7) / 8 Bytes
(Time Stamp Bit Depth + 7) / 8 Bytes
Modulation
Phase
Gate Delay
Frame No.
Time Stamp
Time Stamp
ROI 2 Total Pixels x Pixel Depth / 8 Bytes
ROI 1 Total Pixels x Pixel Depth / 8 Bytes
0
002