An adaptive discrete cosine transform coding scheme for digital x-ray images
- Authors: Mclean, Ivan Hugh
- Date: 1989
- Subjects: X-rays -- Digitization Image processing -- Digital techniques Diagnostic imaging Computer storage devices
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4567 , http://hdl.handle.net/10962/d1002032
- Description: The ongoing development of storage devices and technologies for medical image management has led to a growth in the digital archiving of these images. The characteristics of medical x-rays are examined, and a number of digital coding methods are considered. An investigation of several fast cosine transform algorithms is carried out. An adaptive cosine transform coding technique is implemented which produces good quality images using bit rates lower than 0.38 bits per picture element
- Full Text:
- Date Issued: 1989
- Authors: Mclean, Ivan Hugh
- Date: 1989
- Subjects: X-rays -- Digitization Image processing -- Digital techniques Diagnostic imaging Computer storage devices
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4567 , http://hdl.handle.net/10962/d1002032
- Description: The ongoing development of storage devices and technologies for medical image management has led to a growth in the digital archiving of these images. The characteristics of medical x-rays are examined, and a number of digital coding methods are considered. An investigation of several fast cosine transform algorithms is carried out. An adaptive cosine transform coding technique is implemented which produces good quality images using bit rates lower than 0.38 bits per picture element
- Full Text:
- Date Issued: 1989
Parallel process placement
- Authors: Handler, Caroline
- Date: 1989
- Subjects: Parallel programming (Computer science)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4568 , http://hdl.handle.net/10962/d1002033
- Description: This thesis investigates methods of automatic allocation of processes to available processors in a given network configuration. The research described covers the investigation of various algorithms for optimal process allocation. Among those researched were an algorithm which used a branch and bound technique, an algorithm based on graph theory, and an heuristic algorithm involving cluster analysis. These have been implemented and tested in conjunction with the gathering of performance statistics during program execution, for use in improving subsequent allocations. The system has been implemented on a network of loosely-coupled microcomputers using multi-port serial communication links to simulate a transputer network. The concurrent programming language occam has been implemented, replacing the explicit process allocation constructs with an automatic placement algorithm. This enables the source code to be completely separated from hardware considerations
- Full Text:
- Date Issued: 1989
- Authors: Handler, Caroline
- Date: 1989
- Subjects: Parallel programming (Computer science)
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4568 , http://hdl.handle.net/10962/d1002033
- Description: This thesis investigates methods of automatic allocation of processes to available processors in a given network configuration. The research described covers the investigation of various algorithms for optimal process allocation. Among those researched were an algorithm which used a branch and bound technique, an algorithm based on graph theory, and an heuristic algorithm involving cluster analysis. These have been implemented and tested in conjunction with the gathering of performance statistics during program execution, for use in improving subsequent allocations. The system has been implemented on a network of loosely-coupled microcomputers using multi-port serial communication links to simulate a transputer network. The concurrent programming language occam has been implemented, replacing the explicit process allocation constructs with an automatic placement algorithm. This enables the source code to be completely separated from hardware considerations
- Full Text:
- Date Issued: 1989
The design and implementation of a fourth generation programming language
- Authors: Iverson, Carn Martin
- Date: 1989 , 2013-03-04
- Subjects: Programming languages (Electronic computers) , Fourth generation computers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4584 , http://hdl.handle.net/10962/d1004652 , Programming languages (Electronic computers) , Fourth generation computers
- Description: IV is a very high level language designed for use in a real time production control environment. While most fourth generation languages are intended for use by end users, IV is more suitable for skilled professional programmers. One of the major design objectives of IV is a dramatic improvement in programmer efficiency during application program development. Non-procedural constructs provided by the language and the use of a number of interactive development tools provide an environment for achieving this goal. This report presents a language proposal for IV, and addresses related design and implementation issues.
- Full Text:
- Date Issued: 1989
- Authors: Iverson, Carn Martin
- Date: 1989 , 2013-03-04
- Subjects: Programming languages (Electronic computers) , Fourth generation computers
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:4584 , http://hdl.handle.net/10962/d1004652 , Programming languages (Electronic computers) , Fourth generation computers
- Description: IV is a very high level language designed for use in a real time production control environment. While most fourth generation languages are intended for use by end users, IV is more suitable for skilled professional programmers. One of the major design objectives of IV is a dramatic improvement in programmer efficiency during application program development. Non-procedural constructs provided by the language and the use of a number of interactive development tools provide an environment for achieving this goal. This report presents a language proposal for IV, and addresses related design and implementation issues.
- Full Text:
- Date Issued: 1989
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