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Concealment techniques for data-reduced HDTV recording

: Kharatichvili, M.; Kauff, P.


Image communication 7 (1995), Nr.2, S.173-82
ISSN: 0923-5965
Fraunhofer HHI ()
data compression; digital magnetic recording; digital television; discrete cosine transforms; error correction; high definition television; motion compensation; transform coding; video codecs; video coding; video recording; data-reduced HDTV recording; data-reduced hd-vcr; error protection; error propagation; magnetic tape channel; uncorrected errors; erroneous dct blocks; worst-case situation; spatial concealment; temporal concealment; motion-adaptive concealment; motion-compensated concealment; subjective tests

Most of all data-reduced HD-VCRs use powerful error protection schemes in order to prevent error propagation. Under normal conditions these schemes are able to correct all errors from the magnetic tape channel. However, under bad conditions some uncorrected errors may be left. Therefore, it must be possible to conceal erroneous DCT blocks in order to avoid visible degradations in this worst-case situation. In this context four different concealment techniques (spatial, temporal, motion-adaptive and motion-compensated concealment) are discussed and compared with respect to their efficiency. The results of subjective tests and the discussion of some system aspects show that the motion-adaptive approach is the most suitable one for the underlying application.