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The signal to noise ratio is measured in decibels. The higher the dB number the better the picture. Meaning it has less noise in the picture. Noise can be manifest in graininess, loss of detail, etc. WDR (Wide Dynamic Range) cameras are dB typical and dB maximum providing noise free images. Typical CCTV Security cameras are around db S/R. SNR level is high then the picture quality is good.
If the SNR level is dB - Unusable Picture
dB- Poor picture
dB- Fine grain or snow in the picture
dB- picture good quality
dB- No noise apparent
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