CAMERAS FRAME GRABBERS IMAGING SOLUTIONS
BOBCAT Hardware User’s Manual
IMPERX
Rev. 2.0.9
6421 Congress Ave.
4/8/2014
Boca Raton, FL 33487
www.imperx.com
+1 (561) 989-0006
176 of 329
2.8.2 Digital Domain – manual control
The camera has a built in digital gain and offset control. There are 20 possible digital
gain levels from 1.0x to 3.0x with step of 0.1x, and 1024 offset levels from (–511, to
+ 511).
2.8.3 Automatic Gain Control (AGC)
The camera can be set to automatic gain (and exposure) control in order to keep the
same image brightness during changing light conditions. In this mode the user sets
the image brightness (luminance) to be maintained, and the camera adjusts the gain
accordingly. The user can select the average or peak brightness to be maintained.
The camera starts with changing the gain within the preset by the user min-max
limits. If one of the gain limits has been reached, the camera indicates the limit has
been reached and keeps the value until the light condition change. The speed of
convergence (how fast the camera stabilizes after change), can be preset by the user
(four possible options are available). If both modes, automatic exposure and
automatic gain are enabled simultaneously, the camera starts with changing the
exposure first within the preset by the user min-max limits. If one of the exposure
limits has been reached, the camera engages the analog gain, and changes it within
the preset by the user min-max limits. The AGC algorithm samples all pixels for the
entire frame, but the user can select only a portion of the image (AOI) to be used as a
sample collecting region. The camera displays the current luminance, current
exposure and current gain. For auto exposure control refer to Automatic Exposure
Control (AEC) section.