CHEETAH Hardware User’s Manual
Imperx, Inc.
Rev. 2.0.7
6421 Congress Ave.
7/7/2015
Boca Raton, FL 33487
+1 (561) 989-0006
146 of 152
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
Note.
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.
