Set Partitioned Embedded bloCK coder (SPECK) has been found to
perform comparable to the best-known still grayscale image coders
like EZW, SPIHT, JPEG2000 etc. In this paper, we first propose
Color-SPECK (CSPECK), a natural extension of SPECK to handle color
still images in the YUV 4:2:0 format. Extensions to other YUV
formats are also possible. PSNR results indicate that CSPECK is
among the best known color coders while the perceptual quality of
reconstruction is superior than SPIHT and JPEG2000. We then
propose a moving picture based coding system called Motion-SPECK
with CSPECK as the core algorithm in an intra-based setting.
Specifically, we demonstrate two modes of operation of
Motion-SPECK, namely the constant-rate mode where every frame is
coded at the same bit-rate and the constant-distortion mode, where
we ensure the same quality for each frame. Results on well-known
CIF sequences indicate that Motion-SPECK performs comparable to
Motion-JPEG2000 while the visual quality of the sequence is in
general superior. Both CSPECK and Motion-SPECK automatically
inherit all the desirable features of SPECK such as embeddedness,
low computational complexity, highly efficient performance, fast
decoding and low dynamic memory requirements. The intended
applications of Motion-SPECK would be high-end and emerging video
applications such as High Quality Digital Video Recording System,
Internet Video, Medical Imaging etc.
JPEG2000 is the new ISO/IEC image compression standard. It is a full coding system targeted for various imaging applications. Besides offering the state-of-the-art in still image compression, it provides new features such as scalability in quality and in resolution, random access and region of interest (ROI) coding. Motion JPEG2000 is an inherited video compression standard based on intra-farme coding using JPEG2000. JPIP (the JPEG2000 Interactive Protocol), is a developing protocol for the access and transmission of JPEG2000 coded data and related metadata in a networked environment. In this paper, we present various applications of JPEG2000, Motion JPEG2000 and JPIP, geared specially towards the wireless mobile environment. We present an Image Surfing system for surfing JPEG2000 images on mobile terminals over a wireless network. We also present a scheme for tracking and coding Regions-Of-Interest (ROI) over a Motion JPEG2000 sequence. Finally, we present a Partial Coding scheme for use in Motion JPEG2000 sequences that gives coding gains for certain types of video sequences.
We propose an embedded hierarchical image coding algorithm of low complexity. It exploits two fundamental characteristics of an image transform -- the well defined hierarchical structure, and energy clustering in frequency and in space. The image coding algorithm developed here, apart from being embedded and of low complexity, is very efficient and is comparable to the best known low-complexity image coding schemes available today.