JPEG2000 OverviewBy L A Rønningen, Item, NTNU 2008

Presentation based on:

[4] Lecture notes on JPEG2000, by prof. M Fowler, Binghamton University, New York[3] Z. Li and M Drew, ”Fundamentals of Multimedia”, Pearson 2004[2] A. Skodras, C Christopoulos, and T Ebrahimi, ”The JPEG2000 Still Image Compression Standard. IEEE Signal Processing Magazine, 2001[1] D. Taubman and M. Barcellin, ”JPEG2000: Standard for Interactive Imaging. Proc of the IEEE, Vol 90, No 8, August 2002

Extend input sequence,Convolve with the twofilters, descard every other

Or use

Lifting filter

SNR

’1’’0’

Sample values from SQ Each sample can be truncated, one or more bits

Conceptual correspondence between the spatial and the bit stream representations

Image component

Tile

Precinct

Code blocks

Codestream

Layer – packets

from several resolution

levels

Packet -all code

blocks of a precinct

Coded Codeblock

Note: H stands for header

Packets and layers

Region of interest - ROI -Code important objects with higher quality than less important objects

Scaling quality of ROI by placing the samples inhigher bitplanes

To extract an arbitrarily shaped object, segmentation is needed. A rectangular bit mask, giving ’1’ for pixels insidethe object and ’0’ for pixels outside the object, can be applied