Dalsa RD60M212, Руководство пользователя

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Shad-o-Scan User Manual, Rev04 49
Shad-o-Scan 3001/4501 X-Ray Detector Teledyne DALSA
Name Description Bits Bytes Endian offset
Header Version Version number of header 8 1 Big 0
File Type 0. Defectmap
1. Darkmap
2. Gainmap 8 1 Big 1
Serial Number Serial number of the detector 128 16 Big 2
CRC CRC of total data fle excluding the header
16
2 Little 18
Width Number of columns in full resolution of the
detector 16 2 Big 20
Height Number of rows in full resolution of the detector 16 2 Big 22
Image format 0. Full res
1. Binned 2x2
2. Binned 4x4
3. Binned 1x2
8
1 Big 24
FullWell 0. HFW
1. MFW
2. LFW 8 1 Big 25
File Format 1, 1bit per pixel (for defect maps)
2, 2 bytes per pixel (for gain and offset
maps)
8 1 Big 26
Division Factor Nominal value of gainmap as a power of 2.
A value of 15 means a division of 2 to the power
of 15
8
1 Big 27
Extra1 Reserved 16 2 Big 28
Extra2 Reserved
16
2 Big 30
Total
256
32 32
Example of Gain map header (hex format):
•
Gain map (offset 1, 02)
•
Serialnumber: 123456
•
Width: 1488 (offset 20, 05 D0)
•
Height: 1148 (offset 22, 04 7C)
•
Image format: 0: fullRes (offset 24, 00)
•
FullWell: 0 HFW (offset 25, 00)
•
FileFormat: 2 bytes per pixel (offset 26, 02)
•
Division factor: 2^12 = 4096 (offset 27, 0C)
•
Data: offset 32.
•
First data CF 0F represents a value of 4047 (0FCF) as the data is big endian
UINT16.
How to Create a New Gain Map
To use FFC to correct for system specific spatial intensity variations, new Gain maps
should be created and uploaded to the detector as part of the factory system
calibration routines.
For optimal gain correction, the Gain reference map should be created at an exposure
of approximately 25% of the full scale output signal.
To create a new Gain map:
•
Average at least 16 images captured by the detector, without any object
placed in the X-ray beam.