Dynamic Video Noise
Now Available for High-Definition!
The Colorado Video Model 449 Dynamic Video Noise Filter / Reduction System or Video Noise Reducer can filter
or reduce dynamic video noise (like "snow" or "static") out of a monochrome video signal by essentially averaging
frames over time. This type of video noise filtering or reduction is best suited for signals with rapidly
changing noise in pictures of relatively static (unchanging) subjects.
The Model 449 Dynamic Video Noise Reduction System provides a running quasi-average, or temporal filtering,
of the video signal at its input. More precisely, the value for any given pixel in the units output is
determined by the equation:
where Pn is the value of the pixel in the current output frame, Pi is the value of the pixel in the current
input frame, Pn-1 is the value of the pixel in the previous output frame, and t is a user selected time constant.
This equation is solved for each pixel at the normal video frame rate of 30 times per second. As the user
selects larger values for t, the exponentially decaying influence of a given pixel's value in a particular input
frame will persist over a longer period of time in subsequent output frames. The Model 449 allows values of t
to range from zero (binary 0000) to 15 (binary 1111), making possible temporal filtering of from one to 32,768
(in steps of powers of two) frames on a running basis. The Model 449s 16-bit grayscale resolution provides
65,536 shades of gray for the filtering process.
Contrast & Brightness
Many applications with excessive dynamic video noise or snow suffer from low video signal levels. The Model
449 Video Noise Reduction system offers a 2x signal multiplier, thus doubling contrast, and a potentiometer
controlled digital brightness adjustment.
The output signal can be frozen for continuous display and the filtering function halted.
Frame or Field Modes
The Model 449 Video Noise Reducer normally operates in a 30 frame per second mode with a resolution of 720H x
480V pixels. A field mode at 60 fields per second, with 720H x 240V pixels is selectable. Grayscale is always
16 bits providing 65534 shades of gray.
All Units: Dynamic Video Noise Reduction, Video Noise Filter|
Filter Dynamic Noise
Pseudo-Average Over 2,4,8,16,32...to 65536 Frames
Field or Frame Mode
2x Contrast Enhancement
Black Level (Brightness) Control
Model 449S: Dynamic Video Noise Reduction, Video Noise Filter|
Desktop Style ABS Chassis
5 VDC Power (120 VAC Adapter Included where appropriate)
Model 449: Dynamic Video Noise Reduction, Video Noise Filter |
Aluminum Chassis, Optionally Rack-Mountable
120 VAC or 240 VAC Power Input