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Video Processor Noise Floor

All DSP based system have noise generated by the active devices. The video decoders are affected by

the system noise on the ground and analog power supplies. Isolation techniques on the PCB are used to

reduce the system noise and each DSP based product has different noise floors inherent in the design.

The following chart shows the A/D noise from the Video Processor from a single line of gray-scale data

generated by a generator. You can see the single A/D bit of system noise on the 8-bit luma data.

Lower noise floors are needed to detect low contrast targets without causing a high variance in each cell

of the low-level image processing routines. This allows the system to accurately measure the noise

inherent in a variety of video devices ranging from a video generator, to any type of video camera, IR or

thermal camera. The system noise plus the camera noise determines the lowest contrast targets that can

be detected.

2395 Kenwood Drive Boulder CO 80305 (303) 543-0440

System Noise Floor

100

150

200

250

149

223

297

371

445

519

593

Sample Number

A/D Value

1 2 3 4 5 6 7 8 9

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