VQEG的高清电视测试计划

1、The VQEG HDTV Test PlanOutlineIntroduction: Setting the stageHDTV Source Scenes and HRCsTest methodologiesKey challengesProposed VQEG approachFinal thoughts2HD is no longer the future. It is the present!“NBC will upgrade the rest of the networks top-rated late-night lineup into HDTV in 2005“The Fox

2、network is better prepared then ever for its hi-def broadcast of Super Bowl XXXIX. “The swanky future of hotels is a big-screen HDTV set.“2005 would be the year of high definition video and TV“Shipments of High Definition televisions and set-top boxes are gaining momentum“HDTV content is increasing

3、rapidly3HD studio workflows are mainstream “Adobe, HP, Intel, Microsoft, and Dell have joined together to deliver a line of open, scalable, certified desktop HDV and HD solutions to deliver optimal performance at a price point that is unbeatable today. “JVCs ProHD initiative represents an economical

4、 solution to getting the stations into the HD production business. The company has products to help with this transition on two fronts. 4Content acquisition is affordablePanasonic: The AG-HVX200 DVCPRO HD P2 represents the companys first HD solid-state handheld camcorder. The AG-HVX200 has two card

5、slots and records in 1080/60i, 30p and 24p; 720/60p, 30p and 24p; and DVCPRO50, DVCPRO or DV. It also records 480i and 480p on Mini-DV tape from a built-in drive. AG-HVX200 will come available in the fall for about $5,995. Alec Shapiro, senior vice president of Sony Electronics Broadcast and Product

6、ion Systems Division, touted the acceptance Sonys HDC-1000 1080P camera and the XDCAM tapeless acquisition system have found in the industry. In the high-end HD production arena, Shapiro noted the Sonys HDCAM format is used by virtually 100 percent of the network sitcoms produced in the United State

7、s. 5Viewer adoption is acceleratingMaxent (tm), announced the availability of its value-priced, high-performance 26-inch WXGA LCD Display through Costco Wholesale stores nationwide at a retail price of $1,199. HDTVs keep getting more affordable. Olevias new 32-inch LCD HDTV has a lot of the right in

8、gredients for a good low-cost HDTV.10m homes around the world were watching HDTV programming on a high-definition TV set, according to research from market analysts In-Stat. By the end of 2005, the worldwide total of these HDTV service households is projected to reach 15.5m. By 2021, HDTV households

9、 worldwide are forecast to reach 52m. HDTV services are currently widely available in five countries: Australia, Canada, Japan, the United States, and South Korea. Nearly half of all consumers plan to make their next television purchase a high-definition (HDTV) television set, according to the CEA.

10、6Technology building blocks are in placeBritish Sky Broadcasting (BSkyB) has selected Thomson as its primary HD decoder set top supplier as it prepares to roll out a new digital HDTV service in 2006. The company will use H.264-based advanced video coding for its HD service. Royal Philips Electronics

11、 today unveiled a High-Definition Multimedia Interface (HDMI ) receiver integrated circuit (IC), the TDA9975A, to meet consumer demands for superior image quality in next-generation TVs. The single cable digital multimedia solution has arrived. High-Definition video and audio capability quietly roll

12、ed into the NZ home entertainment market in the lead-up to Christmas, with the release of a number of DVD players, projectors and TV sets from various manufacturers featuring the new High-Definition Multimedia Interface (HDMITM) connectivity standard.7Differentiation based on quality is the next ste

13、pOnHD.TV has generated international attention for our list of the 10 celebrities who look better or worse in crystal-clear High-Definition TV. The list has been featured in such publications as The Chicago Tribune, The National Enquirer, The New York Post and TV shows such as Inside Edition and The

14、 Fox Report With Shepard Smith. Driving much of the companys growth is the worldwide move to HD production, and Thomson has products for the acquisition, editing and distribution of both SD and HD content. The top of the companys line in terms of image quality is its Viper FilmStream digital cinema

15、camera.8Hence the need for standardized metricsTo verify and make credible claimsTo objectively validate the promised media experience9OutlineIntroduction: Setting the stageHDTV Source Scenes and HRCsTest methodologiesKey challengesProposed VQEG approachFinal thoughts10HD landscape todayBroadcastHea

16、d-endSet-top BoxDTH SatelliteCable DistributionIP TV11Content acquisitionQuality: Consumer ($6K), Professional ($50K), Studio ($110K) cameras in use.Storage: HDV, HDCAM, DVCPRO-HD decks are prevalent.Frame Rate: 24p, 29.97i, 30i, 59.94p, 60p.Frame Size: 1920 x 1080 (1080p), 1920 x 540 (1080i), 1280

17、x 720 (720p).12Source Scenes - CopyrightCopyright IssuesPublic DomainShot by VQEG Members (put into public domain or approved for unlimited research use)Purchased specifically for testing (e.g., VClips)Proposal: All scenes must have non-expiring use clause for VQEG testing and be obtainable by any i

18、nterested party13Source Scenes - QualityFormats?Camera/recording quality?Uncompressed?Mildly compressed?Professional Consumer (e.g., Sony HVR-Z1U)?Allowing some percentage of lower grade material will greatly increase available sources14Source Scenes - CharacteristicsMotion?Detail?Color?Size of sour

19、ce scene pool?Percent unknown to proponents?15HRC CharacteristicsBit-rates?Coder/decoders?Error conditions?Pre/post processing?Percent unknown to proponents?16CompressionTechnologies: MPEG4-AVC, MPEG2, VC-1, DV compression.Bit rate: 8 Mbps 25 MbpsRate Control: Variable and constant.Rate Conversion:

20、3:2 pull down.17TransmissionTechnologies: Satellite, Cable, IPPacket loss: 0-25%18Decode and display processing3:2 pull downImage enhancementDe-interlacingScaling19Display ConditionsShould we test many types of video displays or should we use a high quality “transparent video display?What combinatio

21、ns of display types and video formats should be tested?20Display technologiesBroadcast CRTRear projectionLCDPlasmaProjectors21HRC vectors at a glanceContent acquisition:Capture qualityStorage formatFrame rateFrame sizeCompression:Coding technologyBit rateRate controlRate conversionTransmission:Techn

22、ologyPacket lossDecode and display Processing:3:2 pull downImage enhancementDe-interlacingScalingDisplay:Broadcast CRTRear ProjectionLCDPlasmaProjectors22OutlineIntroduction: Setting the stageHDTV HRCsTest methodologiesKey challengesProposed VQEG approachFinal thoughts23Test methodsSubjective testin

23、gSequence processing24Subjective MethodologyWhat subjective testing methodology should we use?Double/single stimulus?Explicit/hidden reference?Continuous/discrete assessment?25Subjective testingDouble Stimulus Impairment Scale4 times picture height for all HD formatsDifferent display technologies24

24、subjects per test with:20/20 visual acuity with or without eye glassesNormal color visionFamiliarity with the languageNo audioSubjects screened per BT.500Subjects rejected if failed votes 1 in one session.26Sequence processing1080p, 1080i and 720p formats.No up-sampling or down-sampling.27OutlineInt

25、roduction: Setting the stageHDTV HRCsTest methodologiesKey challengesProposed VQEG approachFinal thoughts28Key ChallengesHD ContentReliable HD playback for subjective testingInvestments required for HD testingTools for HRC error injectionReference display processing algorithmsSelection of back chann

26、el bandwidth for HD29OutlineIntroduction: Setting the stageHDTV HRCsTest methodologiesKey challengesProposed VQEG approachFinal thoughts30Step 1: Subjective testingSelect sequences and run a subjective test to get MOS results.Include as many display technologies as possible.Make sure a variety of HR

27、Cs are used for the test sequences.Compile results from multiple labs to get a consolidated score for the sequences.31Step 2: Evaluation of existing modelsRun through existing (already submitted) models through the same sequences.Follow procedure and rules for calibration in the test plan.Include fu

28、ll reference, reduced reference and no reference models in the test.32Step 3: Results analysis and next stepsAnalyze objective results to get a correlation to the subjective results.Follow evaluation metrics in the test plan.Decide on next steps based on the results.If correlations are high, we may

29、have a model for HD TV.If correlations are low, proponents will have a test set to tweak their models.33Lab readiness pollOf the labs represented here:How many of them have HD playback capability?Of those who dont have it now, how many of them are planning to have this capability in the next 3 - 6 months.How many labs are willing to run HD subjective tests in the next 3 months?34OutlineIntroduction: Setting the stageHDTV HRCsTest methodologiesKey challengesProposed VQEG appro