Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál stáhnout pdf (Strana 53)

53



(PSNR)valuefortheframecanbecomputedby

PSNR

=‐10log10MSEbr.

Figure2‐4showstheestimatedPSNRvalueoncodingbitrateforMPEG‐2encodedvideo.

Figure2‐4

Estimated

PSNRon

CodingBitrate

forStandard

Definition

MPEG‐2Video

at30Frames

perSecond



Thefollowingexamplesillustratetheimpactofthecodingbitrateonvideoquality.Both

imagesshowthesameframe

fromavideosequenceencodedwithMPEG‐2ataresolutionof

720x480,at30framespersecond.InFigure2‐5thesequencewasencodedatabitrateof

5000Kbps(610KB/s).

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Exfo EXpert IPTV Test Tools (FTB-200v2) Uživatelský manuál Strana 53