Title :
A flexible polygon representation of multiple overlapping regions of interest for wavelet-based image coding
Author :
Rauschenbach, Uwe ; Rosenbaum, Rede ; Schumann, Heidrun
Author_Institution :
Siemens AG, Munchen, Germany
fDate :
6/23/1905 12:00:00 AM
Abstract :
Image transmission over low-bandwidth channels can be speeded up if the image coding mechanism supports regions of interest (RoIs). By such a scheme, image parts not belonging to RoIs can be encoded at a lower bitrate. This paper describes a flexible dynamic RoI scheme which supports the definition of arbitrarily-shaped RoIs before the start of the transmission process and the refinement of a partially transmitted image by the definition of new RoIs at any time during image transmission. The overhead to represent RoIs is kept as small as possible by exploiting a polygon-based RoI representation. Span arithmetic on a multiresolution grid is used to support the redundancy-free transmission of overlapping RoIs
Keywords :
image coding; image representation; transform coding; visual communication; wavelet transforms; arbitrarily shaped RoIs; flexible dynamic RoI scheme; flexible polygon representation; image transmission; low-bandwidth channels; multiple overlapping regions of interest; multiresolution grid; partially transmitted image; polygon representation; redundancy-free transmission; span arithmetic; wavelet-based image coding; Arithmetic; Bit rate; Computed tomography; Computer graphics; Computer science; Image coding; Image communication; Lapping; Shape; Wavelet coefficients;
Conference_Titel :
Image Processing, 2001. Proceedings. 2001 International Conference on
Conference_Location :
Thessaloniki
Print_ISBN :
0-7803-6725-1
DOI :
10.1109/ICIP.2001.958243
