Multiresolutional encoding and decoding in embedded image and video coders
نویسندگان
چکیده
We address multiresolutional encoding and decoding within the embedded zerotree wavelet (EZW) framework for both images 1, 2] and video 3]. By varying a resolution parameter, a user can obtain decoded images at diierent resolutions from one single encoded bitstream, which is already rate scalable for EZW coders. Similarly he/she can decode video sequences at diierent rate and diierent spatial and temporal resolutions from one bitstream. Furthermore, a layered bitstream can be generated with multiresolutional encoding, from which the higher resolution layers can be use to increase the spatial/temporal resolution of the images/video obtained from the low resolution layer. In other words, we have achieved full scalability in rate and partial scalability in space and time. This added spatial/temporal scalability is signiicant for emerging multimedia applications such as fast decoding, image/video database browsing, telemedicine, multipoint video conferencing, and distance learning.
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