Documentation for MDS/Summarization

Technique Summarization
Document NXXX MPEG-7 Working Draft MDS
Name Charilaos Christopoulos (MediaLab, Ericsson Radio Systems AB,Sweden)
Yousri Abdeljaoued (EPFL Switzerland)
Email Charilaos.Christopoulos@era.ericsson.se
Contact Charilaos.Christopoulos@era.ericsson.se
Type Application
External Libraries NONE
Related Ds/DSs Sequential Summary, Hierarchical Summary
Input MPEG-Video (foo.mpg)
Output Extraction:foo.mpg.dir/scene%05.jpg(key frames),
Transcoding:foo.mpg.dir/Summary*.mpg(transcoded summary of foo)
Extraction Yes
Client Appl Transcoding Application
Summary This component computes the FrameChangeValues basing on the feature point activity. During Extraction it also writes the key frames of the sequence to the disk. The client application performs the transcoding of the input sequence, thus
a) it includes only the key frames
b) it has a constant frame activity
Strong Points The extraction process of the frame change values applies a "Karhunen Loeve Transfromation" (KLT). From the KLT a feature point list is generated. A Kalman filter is used to compute the activity of the feature points. This extraction process gives very robust results.
Limitations NONE
Known Problems Images with no feature points are not treated
Parameters /* default application name*/
Application SummarizationClient
/* default database file name*/
ListFile Databases/video.lst
/* default bit stream file*/
Bitstream Summary.ddl
/* default number of matches*/
NoOfMatches 8
/* parameter file for summary extraction*/
/* enable storing and reading of intermediary results*/
RW_intermediary_results 1
/* write activity for all frames*/
WriteAllFramesToDDL 1
/* enable denoising prior to feature point extraction*/
denoise 1
/*minimum geometrical distance between two feature points*/
min_featurepoint_distance 19
distance_threshold 0.25
/*time base*/
nnfraction 30
nn 1
/* acceleration noise*/
acceleration_noise 1500.0
/* update ratio for new values*/
alpha 0.1
/* measurement noise*/
measurement_noise 10.0
/* initial value for standard deviation*/
standard_deviation 0.4