CHEETAH Hardware User’s Manual
Imperx, Inc.
Rev 1.7
6421 Congress Ave.
8/26/2016
Boca Raton, FL 33487
+1 (561) 989-0006
33 of 121
2.1 EXPOSURE CONTROL
2.1.1 Internal Exposure Control - Electronic Shutter
In global shutter, all pixels in the array are reset at the same time, allowed to collect
signal during the exposure time and then the image is transferred to a non-
photosensitive region within each pixel. Once the image is transferred to the non-
photosensitive region, then the readout of the array begins. In this way, all pixels
capture the image during the same time period reducing any image artifacts due to
motion within the scene. The maximum exposure is frame time dependent and the
minimum exposure is ~ 4 microseconds.
The camera normally overlaps the exposure and readout times as shown in Figure
Figure 11.
Figure 11:
Global Shutter with 8.33mS exposure time
2.1.2 External exposure control
The camera exposure can be controlled using an external pulse, supplied to the
camera. The pulse duration determines the exposure. In global shutter mode, the
minimum exposure time is about 4 to 6 micro-seconds. Please refer to 2.5 Camera
Triggering and 2.14 I/O control sections.