Operation
The Cristal connects to the system between the camera and the monitor (or recording
device). It operates by means of a combination of techniques: · The application of
variable amounts of gain to the video signal · The formation of a rolling average of
the incoming video · The subtraction of an image of the reference background noise from
the camera sensor. The application of increased gain (up to x150) to a video signal will
allow low level signals to be viewed on a monitor. Unfortunately this technique alone is
not sufficient to allow a daylight camera to operate at night as the signal to noise
ratio generated by the sensor in low light conditions is comparatively high. The use of
a rolling average extracts a useable signal from what is predominantly "system noise" at
the low light levels at which the system is intended to operate. The subtraction of
"fixed pattern noise" generated by the sensor, also enhances the quality of the displayed
image. The subtraction of a reference image may also be used to show up movement in a
scene.
Related Products
The Cristal Video Pre-Processor is also available as a PCI format board for use
within imaging systems based on the PC. It is compatible with other Vision Dynamics
framestore boards to provide the video image within a window on the PC display. Please
contact us for further details.
Enhances images from poorly lit areas
Security and covert observations
Astronomy
X-ray enhancement of dense targets
Low light viewing for zoological study
Improvement of single stage intensified camera images
