ATIS - Alliance for Telecommunications Industry Solutions
Scope
This standard specifies a method for estimating the video performance of a one-way video transmission system@ as shown in Figure 1. The objective video performance estimator is defined for the end-to-end transmission quality between the two points shown in the figure. The estimation method is based on processing 8-bit digital component video as defined by ITU-R Recommendation BT.601 (henceforth abbreviated as Rec. 601).1 The encoder shown in Figure 1 can utilize various compression methods (e.g.@ MPEG@ H.263@ NTSC@ etc.). The transmission channel may be a simple pass-through for evaluation of a codec (encoder/decoder combination) or may include a concatenation of various compression methods and memory storage devices@ but it is assumed that any digital transport involved is error-free. While the derivation of the objective quality estimator described in this standard considered error impairments (e.g.@ bit errors@ dropped packets)@ independent testing results are not currently available to support the use of the estimator for systems with error impairments. Purpose This standard provides a video performance estimation method for one-way compressed video signals transported digitally on an error-free network or storage system. This video performance estimation method is for possible use with end-user systems@ carriers@ information and enhanced-service providers@ and customer premise equipment@ provided they introduce no significant error events (e.g.@ bit errors@ dropped packets). 1 This does not preclude implementation of the measurement method for one-way video transmission systems that utilize composite video input and outputs. Specification of the conversion between composite and component domains is not part of this standard. For example@ SMPTE 170M specifies one method for performing this conversion for NTSC.