32
Camera Operation & Features
Document No.: 04646-01
PixeLINK PL-A780
MACHINE VISION CAMERA
SYSTEM GUIDE
Copyright © 2004 PixeLINK
All Rights Reserved
5.1.3.4 Gamma
Auto No
Manual Yes
One-time
Auto
No
Off Yes
CiD No
Gamma controls the contrast in the image by translating pixel
values according to a logarithmic curve. A value of one is a linear
translation. Higher or lower values of gamma will result in missing
codes in the image histogram.
The Gamma curve is applied internally in the camera in the form of
a calculated look up table – the same table used by the Look Up
Table feature. When the Gamma feature is activated, the Look Up
Table feature is disabled and vice versa.
Parameter Unit Type
Min
Max
Default
Step
Size
Comments
Gamma None
Absolute
0.1
4.0
2.2 0.1
5.1.3.5 Memory Channel
Auto No
Manual Yes
One-time
Auto
No
Off No
CiD No
The memory channel feature stores all camera parameters into
non-volatile memory. Valid values are 0 for factory defaults or 1 for
memory channel 1.
Parameter Unit Type
Min
Max
Default
Step
Size
Comments
Memory
Channel
None Absolute 0 1
1
1
5.1.3.6 Region of Interest
Auto No
Manual Yes
One-time
Auto
No
Off No
CiD Yes
Under video format 7, the ROI control sets the area on the imager
that is active. Together with the Pixel Addressing mode and the
pixel format, the ROI control determines the total number of pixels
in a frame and the total size of the image. The smallest ROI
possible is 24 x 24 pixels. The ROI can be positioned with a
granularity of 24 pixels in both horizontal and vertical directions.
Parameter Unit Type
Min
Max
Default
Step
Size
Comments
Left Columns
Absolute
0
2184
0 24
Top Rows
Absolute
0
2976
0 24
Width Columns
Absolute
24
2208
2208 24
Height Rows
Absolute
24
3000
3000
24
