Dalsa Falcon 4-CLHS Series, User Manual

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Falcon™ 4 -CLHS Series Operational Reference • 39
Defective Pixel Replacement
The Pixel Replacement algorithm is based on a predefined bad pixel map (as an XML file), either
supplied by the factory (file loaded as “Factory Map”) or generated by the user (file uploaded as
“User Map 1”). The number of bad pixel entries is limited and
varies dependent on the Falcon4
model.
Note : Identifying bad pixels is left to the user’s discretion, but Teledyne DALSA
technical support can provide guidance.
The following XML code sample forms the template for the user to build bad pixel maps for any of
their Falcon4 cameras.
Example User Defective Pixel Map XML File
The following example shows the required components of the defective pixel map file. Each bad
pixel position (relative to the image origin which is the upper left corner), must be identified by the
XML statement:
<DefectivePixel OffsetX=”
number
” OffsetY=”
number
”/>
Note : Pixels must be sorted in the XML file by ascending row (OffsetY); within each
row, pixels must also be sorted in ascending order horizontally (OffsetX).
The pixel format (whether 8 or 10-bit) is handled transparently, thus requires no special
consideration by the user.
This example XML listing has four “bad” pixels identified (maximum number of entries is model
dependent). The Algorithm descriptions that follows defines the rules used by the Falcon4 firmware
to replace an identified bad pixel.
<? xml version = " 1.0 " encoding = " utf-8 " ?>
<!-- Example User Defective Pixel Map -->
<!-- maximum 2048 coordinates -->
<!-- filename: Falcon4ExampleBadPixels.xml -->
< Coordinates >
< DefectivePixel OffsetX = " 100 " OffsetY = " 0 " />
< DefectivePixel OffsetX = " 468 " OffsetY = " 50 " />
< DefectivePixel OffsetX = " 223 " OffsetY = " 600 " />
< DefectivePixel OffsetX = " 800 " OffsetY = " 600 " />
</ Coordinates >
A sample editable defective pixel map replacement file is included with the Falcon4 firmware .zip
files available for download from the Teledyne DALSA website:
https://www.teledynedalsa.com/en/support/downloads-center/firmware/