156 • Operational Reference Nano Series GigE Vision Camera
Defective Pixel Replacement (Method 3)
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 Nano model.
The following XML code sample forms the template for the user to build bad pixel maps for any of
their Nano cameras.
Note: Identifying bad pixels is left to the user’s discretion, but Teledyne DALSA technical support
can provide guidance.
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
”/>
The pixel format (whether 8, 10, 12-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 Nano firmware to
replace an identified bad pixel.
<?xml version=”1.0” encoding=”UTF-8” ?>
<!–-Example User Defective Pixel Map
<!-- maximum 512 coordinates
<!–-filename: NanoExampleBadPixels.xml
<Coordinates>
<DefectivePixel OffsetX=”100” OffsetY=”0”/>
<DefectivePixel OffsetX=”28” OffsetY=”345”/>
<DefectivePixel OffsetX=”468” OffsetY=”50”/>
<DefectivePixel OffsetX=”800” OffsetY=”600”/>
</Coordinates>
An sample editable defective pixel map replacement file will be available to download with Nano
firmware files.
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