Shad-o-Scan User Manual, Rev04
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Shad-o-Scan 3001/4501 X-Ray Detector
Teledyne DALSA
Separate defect pixel maps are available for different Readout- and Full Well modes.
These maps are used by the detector to apply DPC on images, before streaming them
over the data communications interface.
The defect map can be used by the host application to apply corrections for defect
pixels in images captured from the detector. The host application may use the
“Teledyne X
-
Ray Processing Library” functions to apply such corr
ections, or for the
creation and uploading of new correction maps. A copy of this library and its API can
be requested from your local technical customer support specialist or account
manager.
DPC Calculation
The pixel value after DPC correction is interpolated from an analysis of neighboring
pixel values in a 5x5 kernel. Interpolation is performed in the direction in which the
image content shows the least amount of change within this kernel.
File Format
The file format of a defect map is as follows: A header indicates the specification of
the defect map and will be followed by a data block with the defect information per
pixel. Only one bit per pixel is used to indicate the defect status (0 = no defect, 1 =
defect). The defect status data per pixel is ordered row-by-row, left-to-right and top-
to-bottom in an image displayed on a computer screen). The 32 bytes header format is
described below:
