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• W137387941 abstract "This research develops a parallel algorithm to implement the JPEG standard forcontinuous tone still picture compression to be run on a group of transputers. Theprocessor-farm paradigm is adopted. This research shows this to be the best paradigm foruse with the JPEG baseline algorithm on the measured component times within thealgorithm. The speedup of the parallel algorithm is investigated and measured against asingle processor version. A n optimal distribution of J P E G components on the processorswithin the processor farm is established.The research focuses on the investigation of the optimal number of processors, which canbe used effectively for a JPEG implementation adopting the processor-farm paradigm.This optimal number is termed the saturation point. Once the saturation point has beenreached, it is shown that the parallel algorithm's speedup cannot be improved without theredistribution of tasks in the farm, regardless of h o w many extra processors are used.Further distributions of processing tasks are investigated with the aim of extending thesaturation point. It is shown that the saturation point can be extended, and thedistributions of tasks to achieve this are demonstrated. It is also shown that while thesaturation point can be increased, the gains are minimal and m a y not be worth the cost ofthe extra processor. In fact, the algorithm speedup diminishes after the addition of thethird processor, up to saturation point.A simulation algorithm is devised using Java, which takes advantage of the multithreadednature of the language. A technique is developed for simulating the processorfarmparadigm. This technique uses the concept of the Java threadgroup as a basis for asimulated processor, and a Java thread allocated to that group, as a process belonging tothis processor. A process scheduling scheme is refined which allows the simulatedparallel system to be monitored over simulated scheduling rounds. A scheme is alsoshown that simulates the message passing of the transputer.This simulated system allows the investigation of the saturation point regardless of thenumber of processors physically available. Further data on the saturation point supportsthe hypothesis that the saturation point is around seven processors. The hypothesis isbased on the extrapolation of the results obtained using a limited number of processors.Using the simulation, the behaviour of a parallel system can be observed with an arbitrarynumber of processors. Since this simulation is written in Java, it is also platformindependent, and defines an algorithm suitable for a distributed system." @default.
• W137387941 created "2016-06-24" @default.
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• W137387941 date "1998-01-01" @default.
• W137387941 modified "2023-09-26" @default.
• W137387941 title "An investigation into the parallel implementation of JPEG for image compression" @default.
• W137387941 hasPublicationYear "1998" @default.
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