Image/video spatial scalability in compressed domain
Qingwen Hu; Panchanathan, S.
Industrial Electronics, IEEE Transactions on
Volume 45, Issue 1, Feb 1998 Page(s):23 - 31
Digital Object Identifier 10.1109/41.661301
Summary:Image/video compression is widely used in various applications
with the advent of the Joint Photographic Expert Group (JPEG), Motion
Picture Expert Group (MPEG), and H.261 standards. Hence, most visual
data are stored in the compressed format. Spatial scalable encoding of
visual data has several applications, including browsing visual
databases, querying multimedia databases, interactive multimedia
communications, etc. We propose two novel techniques, namely, format
compatible (FC) discrete cosine transform (DCT) and format modified (FM)
DCT to implement image/video spatial scalability directly in the DCT
compressed domain. The FC-DCT technique can be used to manipulate the
standard bit streams, such as JPEG, MPEG, etc., while the FM-DCT
technique can be employed in a variety of applications which require
fast processing. In contrast to the traditional spatial-domain
techniques, the compressed-domain techniques remove the unnecessary
decompression and recompression procedures, thus, they have the
advantages of reduced computational complexity and storage requirements.
Simulation results demonstrate that the proposed DCT-domain techniques
can achieve a comparable performance at a much lower computational
complexity compared to the spatial-domain techniques
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