In this chapter we discuss various bitmap index technologies for efficient query processing in data warehousing applications. We review the existing literature and organize the technology into three categories, namely bitmap encoding, compression and binning. We introduce an efficient bitmap compression algorithm and examine the space and time complexity of the compressed bitmap index on large ...

We review the standard JPEG2000 for still image compression and mention some typical applications. Special weight is put onto the core coding system described in Part 1 and the compound image file format for document imaging described in Part 6 including a section on image segmentation. Index Terms — JPEG2000, still image compression, mixed raster graphics, segmentation

PURPOSE We aimed to evaluate the longitudinal stability of left common iliac vein (LCIV) compression by the right common iliac artery on magnetic resonance venography (MRV). MATERIALS AND METHODS This retrospective study included 214 patients diagnosed with May-Thurner syndrome by MRV. We identified a subset of patients who underwent contrast-enhanced cross-sectional imaging of the pelvis six...

Modern RDBMSs support the ability to compress data using methods such as null suppression and dictionary encoding. Data compression offers the promise of significantly reducing storage requirements and improving I/O performance for decision support queries. However, compression can also slow down update and query performance due to the CPU costs of compression and decompression. In this paper, ...

Advances in DNA sequencing technology will soon result in databases of thousands of genomes. Within a species, individuals’ genomes are almost exact copies of each other; e.g., any two human genomes are 99.9% the same. Relative Lempel-Ziv (RLZ) compression takes advantage of this property: it stores the first genome uncompressed or as an FM-index, then compresses the other genomes with a varian...

This research aims to investigate the effect of temperature changes on the compression index and collapse potential of the residual granitic soil that is widely encountered in Malaysia. An experimental study was conducted on the compacted soil using a modified temperaturecontrolled oedometer. Temperatures of 27, 40, and 60 oC were applied on two series of soil specimens with different values of...