Point Grey Flea3 USB 3.0 Technical Reference 7 Imaging Parameters and Control
If you turned on all possible options the first 40 bytes of image data would contain camera information in the following
format, when accessed using the FlyCapture 2 API:
(assuming unsigned char* data = rawImage.GetData(); and an Image object rawImage):
n data[0] = first byte of Timestamp data
n data[4] = first byte of Gain data
n data[24] = first byte of Frame Counter data
If only Shutter embedding were enabled, then the first 4 bytes of the image would contain Shutter information for
that image. Similarly, if only Brightness embedding were enabled, the first 4 bytes would contain Brightness
information.
For black and white cameras, white balance is still included, but no valid data is provided.
Interpreting Timestamp information
The Timestamp format is as follows (some cameras replace the bottom 4 bits of the cycle offset with a 4-bit version of
the Frame Counter):
Cycle_offset increments from 0 to 3071, which equals one cycle_count.
Cycle_count increments from 0 to 7999, which equals one second.
Second_count increments from 0 to 127. All counters reset to 0 at the end of each cycle.
On USB 3.0 devices, the four least significant bits of the timestamp do not
accurately reflect the cycle_offset and should be discounted.
Interpreting ROI information
The first two bytes are the distance from the left frame border that the region of interest (ROI) is shifted. The next two
bytes are the distance from the top frame border that the ROI is shifted.
7.13.1 FRAME_INFO: 12F8h
Field Bit Description Frame-Specific Information
Presence_Inq [0]
Presence of this feature
0: Not Available, 1: Available
[1-5] Reserved
Revised 9/27/2012
Copyright ©2011-2012 Point Grey Research Inc.
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