Description

Noise constitutes an unwanted signal that inevitably adds to the useful part of the signal. Noise may originate from different sources, e.g. electronic sensor noise, quantisation noise, film grain noise etc.

Definition

Used in Checks, the system shall detect video segments showing a noise level that is above a user-defined threshold. Optionally the system may report a video noise level measurement over time.

Used in Reports, the system shall provide a video noise level measurement over time.

CheckResult definition v3

not in this version

Analysis method v3

not in this version

References

• EBU Tech 3335

  Remark: This document gives guidance on noise levels in cameras (provided as guidance).

Examples

• Input: "Video Noise Threshold" = 30 dB
  Input: "Video Noise Minimum Segment Duration" = 1 second
  Output: "Check Result" = false
  Output: "Video Noise Segment" from 00:00:01:00 to 00:00:02:21
  --> "Noise Average" = 32.1 dB
  --> "Noise Maximum" = 35 .2 dB

  Remark: Used as a Check.
  The reported Noise Average of 32.1 dB is beyond the specified threshold.

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• Input: "Video Noise Measure Interval" = 5.0 seconds
  Output: "Video Noise Level Measured Over Time" = 29.1 dB 29.2 dB 28.9 dB 28.4 dB 28.6 dB ...

  Remark: Used as a Report.
  The output is formed by the measured values separated by spaces.

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A 'structural' badge marks a node with no Value of its own; its value, if any, lives on its children instead (Annex C).

Remarks

The implementation of video noise detection is vendor specific. The noise level value range and unit is implementation dependent. This applies to the detection algorithms deployed and the thresholds to trigger reporting.

Although it is possible to estimate the visual noise level by a signal to noise ratio (SNR) measure, in a finished programme the results often need interpretation by an Operator (Golden Eyes).