Performance Evaluation of Compression and Security Algorithms for Audio-Video Streaming and Implementation of Selected Algorithms
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Date
2011-04
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Addis Ababa University
Abstract
Audio, Image and Video are multimedia data that are ubiquitous in the digital
world. The raw forms of such data produced by capturing devices contain some
unnecessary details that can be removed so that only usable/observable
contents are maintained for storage. Other contents are temporally or spatially
redundant so that long repetitions can be represented in a more storage efficient
way. The process of reducing the size of data is called compression. The
compressed data are reprocessed to create the original or near original data
through a process of decompression. For multimedia data, there are numerous
algorithms and programs to perform the compression and decompression
process that are created, developed and maintained by different commercial and
non-commercial organizations converting the processed data into custom
formats. The diversity in storage formats makes it difficult for users to definitively
adapt a uniform standard for data management. Processing time, storage
requirement, and bandwidth consumption of the data vary among the
representations. This thesis work independently treats Audio, Image and Video
data and carries out performance evaluation based on defined set of parameters.
Data files have been prepared and subjected to compression and decompression
programs and values for the performance parameters are registered under
uniform test environment for each data type. The observations point out the
difficulty in ultimately deciding the best algorithms in each test case due to the
trade off that exists between the defined parameters. So many real life
applications have been considered and optimal algorithms have been suggested
based on affordable tradeoffs. A new algorithm for image compression has been
designed, implemented and tested. Security test has also been done to observe
the effect of applying security features to the data. Securing data imposes
additional processing time and has little effect on the storage size.
Key words: Compression, Decompression, Codec, Audio, Image, Video,
Multimedia, Performance, Evaluation, Lossy, Lossless, Security.
Description
Keywords
Compression, Decompression, Codec, Audio, Image, Video, Multimedia, Performance, Evaluation, Lossy, Lossless, Security