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- W173876458 abstract "Publisher Summary This chapter describes the parallel implementation of the 2-D fast cosine transform (FCT).The design of efficient algorithms for the computation of the 2-D discrete cosine transform (DCT) has been studied for many years and a variety of algorithms have been proposed. The algorithms are based on decimation-in-frequency (DIF) radix-2 or split-radix approach; they have the same computational complexity but are not in-place due to an input-mapping stage required before the computation of the butterflies. The examined algorithms in the chapter are: row-column (RC) FCT and vector-radix (VR) FCT. A sun sparc 10 with 4 processors and shared-memory is considered. It is observed that the parallel approach provides considerable gain for block sizes of more than 128x128 pixels. Programs with coarse-grain parallelism can benefit from multi-threading when run on multiprocessor hardware. However, programs in which each thread does not execute enough code between synchronization can have performance problems because of the overhead involved in the creation and the synchronization of threads. Synchronization of threads can be achieved through mutual exclusion locks, condition variables, semaphores or the multiple reader-single writer lock. Once a thread is created, it executes the function specified by the call. . In addition, it is observed that the usual measure of performance of an algorithm, in terms of number of additions and multiplications, is not adequate and other operations as memory accesses and data transfers have to be taken into account." @default.
- W173876458 created "2016-06-24" @default.
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- W173876458 date "1995-01-01" @default.
- W173876458 modified "2023-09-27" @default.
- W173876458 title "Modelling the 2-D FCT on a Multiprocessor System" @default.
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- W173876458 doi "https://doi.org/10.1016/b978-044482106-5/50021-1" @default.
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