| Technique | Mosaic |
|---|---|
| Document | NXXX MPEG-7 Working Draft MDS |
| Name | Charilaos Christopoulos, Håkan Wallin(MediaLab, Ericsson Radio Systems AB,Sweden) |
| Charilaos.Christopoulos@era.ericsson.se | |
| Contact | Charilaos.Christopoulos@era.ericsson.se |
| Type | Application |
| External Libraries | NONE |
| Related Ds/DSs | SummaryDS, Parametric Motion |
| Used Ds/DSs | Parametric Motion |
| Input | MPEG-Video (foo.mpg), Wave Audio File (foo_audio_track.wav) |
| Output | Extraction: foo.mpg.dir/mosaic.jpg (the mosiac itself) Transcoding: foo.mpg.dir/mosaic.mpg (inverse movie from mosaic) |
| Extraction | Yes |
| Client Appl | Transcoding Application |
| Summary | This component computes the affine motion model from frame to frame and creates a background mosaic basing on this information. |
| Strong Points | The mosaic allows a very good Summary of a sequence. |
| Limitations | The input sequence must not include scene cuts |
| Known Problems | NONE |
| Parameters | /* default application name*/ Application MosaicClient /* default database file name*/ ListFile Databases/video_nocuts.lst /* default bit stream file*/ Bitstream Mosaic.ddl /* default number of matches*/ NoOfMatches 8 /* parameter file for extraction*/ /*Extractparfile extract.par*/ /* extract only new media files*/ SkipExtracted 1 /* Offset between Frames to be used for extraction*/ FrameDistance 3 /* Origin for motion parameters 0= (0,0) 1= center*/ POMOrigin 1 /* Hierarchies for Motion extraction*/ POMResolutions 4 /*Scale between Hierarchies*/ POMResolutionScale 0.7 /*Start From Zero for every image*/ POMStartFromZero 1 /* type of motion model*/ MotionModel 2 /*2=affine*/ /* time base*/ nnfraction 30 nn 1 /* skip boundary pixels*/ SkipBoundaryWidth 2 /* create mosaic image*/ CreateMosaic 1 /* Maximum size of the Mosaic*/ MosaicX=600 MosaicY=600 /* Mosaic Type 0= past, 1= extend 2=merge*/ MosaicType 1 /* scale values for parameter update*/ AlphaStart0 0.25 AlphaLimit0 0.005 AlphaStart1 0.25 AlphaLimit1 0.005 AlphaStart2 0.25 AlphaLimit2 0.005 AlphaStart3 1. AlphaLimit3 0.02 |