Cheetah KAC Camera User Manual | Camera Link (CLF) Interface
October 1, 2019
Page
134
of
135
Rev 7.2
Appendix C - Creating DPC &
HPC Tables
C.1 Overview
The Defective Pixel Map (DPM) and Hot Pixel Map (HPM) are provided with each camera.
If the user wants to create its own DPM or HPM file, he/she can use any standard ASCII
text editor or Microsoft Excel. Additionally, any spreadsheet or mathematical program
capable of generating a comma delimited (.csv) file can be used.
C.2 Using an ASCII Text Editor
A custom Defective Pixel Map (DPM) and Hot Pixel Map (HPM) can be prepared using any
ASCII text editor, such as “Notepad” or similar. The file must have a .dpm extension for
DPM map and .hpm extension for HPM. The .dpm (or .hpm) file has two main sections: a
header and a table. The ‘header’ section is a free text area of up to 256 ASCII characters.
Each line of the header section must be terminated in a comma. The ‘table’ section of the
file contains an array of lines with each line containing an X (pixel number) value followed
by a comma and a Y (line number) value. All pixels are listed in the DPM (or HPM) in order
of increasing Y location. If the Y location is identical, the listing is in order of increasing X
location. After editing save each file with the appropriate file extension. The maximum
number of pixels in the DMP list is 128, and in HPM list is 1024.
Here is a simple example how to create a DPM. Create the DPM file with extension .dpm
using “Notepad” or any other editing software. Locate the defective pixels in the camera
and enter them in order starting with the smallest pixel number of the line number first.
The file looks like this:
-- Defective Pixel Map,
-- Date: 7/21/2013,
-- Model#: CLB-B0610M,
-- Serial#: 060380,
:Table,
-- Column(X),Row(Y)
4,1
588,1
78,5
82,27
405,300
In this example, the first table entry is pixel 4 from line 1, the next entry is pixel 588 from
line 1, and the next entry is pixel 78 from line 5 and so on.
