A digital watermarking scheme for Bezier surfaces
- Chadwick, J, Bangay, Shaun D, Wentworth, Peter E
- Authors: Chadwick, J , Bangay, Shaun D , Wentworth, Peter E
- Date: 2003
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/432769 , vital:72898 , https://www.cs.ru.ac.za/research/groups/vrsig/pastprojects/046watermarking/paper01.pdf
- Description: Owners and vendors are increasingly publishing their materials in digital form. Because such materials can be exactly copied, a mechanism is required that will protect the legitimate owners of these works, by providing proof of original ownership. Digital watermarking has now become one accepted method of establishing ownership of digital materials. The owner of a work embeds a pattern, called a digital watermark, in the content. This embedded watermark is normally undetectable, but its presence can be demonstrated by the owner of the work or his agent, thereby proving ownership. Digital watermarking has been used for many types of multimedia content, primarily audio, video and flat images. Recently, interest has been shown in applying digital watermarking schemes to 3D surfaces, in various formats. In this paper, we examine a method whereby a digital watermark can be embedded in a Bezier surface. A prototype watermarking method for such surfaces is presented, with some experimental results, and a discussion of directions for future research.
- Full Text:
- Authors: Chadwick, J , Bangay, Shaun D , Wentworth, Peter E
- Date: 2003
- Subjects: To be catalogued
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/432769 , vital:72898 , https://www.cs.ru.ac.za/research/groups/vrsig/pastprojects/046watermarking/paper01.pdf
- Description: Owners and vendors are increasingly publishing their materials in digital form. Because such materials can be exactly copied, a mechanism is required that will protect the legitimate owners of these works, by providing proof of original ownership. Digital watermarking has now become one accepted method of establishing ownership of digital materials. The owner of a work embeds a pattern, called a digital watermark, in the content. This embedded watermark is normally undetectable, but its presence can be demonstrated by the owner of the work or his agent, thereby proving ownership. Digital watermarking has been used for many types of multimedia content, primarily audio, video and flat images. Recently, interest has been shown in applying digital watermarking schemes to 3D surfaces, in various formats. In this paper, we examine a method whereby a digital watermark can be embedded in a Bezier surface. A prototype watermarking method for such surfaces is presented, with some experimental results, and a discussion of directions for future research.
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A new public sphere?: outstanding issues
- Wasserman, Herman, De Beer, Arrie
- Authors: Wasserman, Herman , De Beer, Arrie
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159142 , vital:40272 , https://hdl.handle.net/10520/EJC146261
- Description: It is widely accepted that a healthy public sphere is a necessity for democracy, and that the media can facilitate debate in this sphere. In the years since democratisation in South Africa, the media's freedom to fulfil this role has been jealously guarded.
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- Authors: Wasserman, Herman , De Beer, Arrie
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159142 , vital:40272 , https://hdl.handle.net/10520/EJC146261
- Description: It is widely accepted that a healthy public sphere is a necessity for democracy, and that the media can facilitate debate in this sphere. In the years since democratisation in South Africa, the media's freedom to fulfil this role has been jealously guarded.
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Asterisk: A converged tdm and packet-based communications system
- Authors: Penton, J , Terzoli, Alfredo
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/427547 , vital:72446 , https://citeseerx.ist.psu.edu/document?repid=rep1andtype=pdfanddoi=70080710a6f96bf1c071be14a8b21c17ff8cbc4d
- Description: Converged TDM and packet-based communications systems are a popular topic in computer science and telecommunications arenas. This paper discusses a system called Asterisk that is an open source hybrid TDM and packet voice platform. Asterisk is designed to interface any piece of telephony hardware or software with any telephony application. This makes Asterisk a powerful component that can be easily used in NGN softswitches, conferencing servers and Private Branch eXchanges (PBX). Asterisk has been deployed in the Rhodes University Computer Science Department’s VoIP environment and integrated with our existing H. 323 and SIP packet-based networks. This paper discusses the de-ployment of Asterisk, its interworking with our H. 323 and SIP networks and the functionality it offers in terms of a converged TDM and packet-based communications system.
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- Authors: Penton, J , Terzoli, Alfredo
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/427547 , vital:72446 , https://citeseerx.ist.psu.edu/document?repid=rep1andtype=pdfanddoi=70080710a6f96bf1c071be14a8b21c17ff8cbc4d
- Description: Converged TDM and packet-based communications systems are a popular topic in computer science and telecommunications arenas. This paper discusses a system called Asterisk that is an open source hybrid TDM and packet voice platform. Asterisk is designed to interface any piece of telephony hardware or software with any telephony application. This makes Asterisk a powerful component that can be easily used in NGN softswitches, conferencing servers and Private Branch eXchanges (PBX). Asterisk has been deployed in the Rhodes University Computer Science Department’s VoIP environment and integrated with our existing H. 323 and SIP packet-based networks. This paper discusses the de-ployment of Asterisk, its interworking with our H. 323 and SIP networks and the functionality it offers in terms of a converged TDM and packet-based communications system.
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Capital E for events: ways that work: useful solutions
- Authors: Garman, Anthea
- Date: 2003
- Language: English
- Type: text , article
- Identifier: vital:38359 , http://hdl.handle.net/10520/EJC146297
- Description: You would think being located in a small town in one of the most impoverished provinces in South Africa would be a drawback for making media. But a small town is a reachable, convenient laboratory environment for student journalists - and never more so than when the National Arts Festival comes to Grahamstown during the winter vacation.
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- Authors: Garman, Anthea
- Date: 2003
- Language: English
- Type: text , article
- Identifier: vital:38359 , http://hdl.handle.net/10520/EJC146297
- Description: You would think being located in a small town in one of the most impoverished provinces in South Africa would be a drawback for making media. But a small town is a reachable, convenient laboratory environment for student journalists - and never more so than when the National Arts Festival comes to Grahamstown during the winter vacation.
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Interrogate the information society:
- Authors: Berger, Guy
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159181 , vital:40275 , https://hdl.handle.net/10520/EJC146276
- Description: If there is one thing journalists should know about the "Information Society", it's this: never use the phrase as if its meaning speaks for itself. This is one of the most slippery and contentious phrases yet to grace contemporary discourse. For a start, why "Information Society" and not "Knowledge Society"? And why "society" and not "economy"? This is not academic semantics. There are wholly different meanings at stake with different implications for journalists, politicians, policy makers and many more.
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- Authors: Berger, Guy
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159181 , vital:40275 , https://hdl.handle.net/10520/EJC146276
- Description: If there is one thing journalists should know about the "Information Society", it's this: never use the phrase as if its meaning speaks for itself. This is one of the most slippery and contentious phrases yet to grace contemporary discourse. For a start, why "Information Society" and not "Knowledge Society"? And why "society" and not "economy"? This is not academic semantics. There are wholly different meanings at stake with different implications for journalists, politicians, policy makers and many more.
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Pharmaceutical Pictograms: Part 1: Communicating Medicine Information to the Low-literate Patient
- Dowse, Roslind, Ehlers, Martina S
- Authors: Dowse, Roslind , Ehlers, Martina S
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157026 , vital:40080
- Description: To assess the influence of formal education on the interpretation of pharmaceutical pictograms.
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- Authors: Dowse, Roslind , Ehlers, Martina S
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/157026 , vital:40080
- Description: To assess the influence of formal education on the interpretation of pharmaceutical pictograms.
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Pipes, poles and people:
- Authors: Kyazze, Simwogerere
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159153 , vital:40273 , https://hdl.handle.net/10520/EJC146268
- Description: Tina James, a South African ICT consultant, tells the story of Minnie Barendse Kruger who had been struggling to get a Khoisan Cultural Village going in the Eastern Cape. Kruger set up a restaurant where traditional food is prepared, and the Barendse Griquas Trust stepped in and helped set up a multi-purpose Community Centre.
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- Authors: Kyazze, Simwogerere
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159153 , vital:40273 , https://hdl.handle.net/10520/EJC146268
- Description: Tina James, a South African ICT consultant, tells the story of Minnie Barendse Kruger who had been struggling to get a Khoisan Cultural Village going in the Eastern Cape. Kruger set up a restaurant where traditional food is prepared, and the Barendse Griquas Trust stepped in and helped set up a multi-purpose Community Centre.
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The OSS promise:
- Authors: Kyazze, Simwogerere
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159138 , vital:40271 , https://hdl.handle.net/10520/EJC146251
- Description: For Africa the attraction of open source software (OSS), is obvious. But for once, Internet intellectuals are not simply sounding off to annoy the rich north.
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- Authors: Kyazze, Simwogerere
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159138 , vital:40271 , https://hdl.handle.net/10520/EJC146251
- Description: For Africa the attraction of open source software (OSS), is obvious. But for once, Internet intellectuals are not simply sounding off to annoy the rich north.
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The prevalence of use and value of wild edible herbs in South Africa
- Authors: Shackleton, Charlie M
- Date: 2003
- Language: English
- Type: Article
- Identifier: vital:6652 , http://hdl.handle.net/10962/d1007063
- Description: The prevalence of use and commercial value of wild edible herbs in South Africa is examined from four recent quantitative studies at eight different sites. The use of wild edible herbs was widespread in rural communities, with over 90% of households using them in all but one sample site. Mean frequency of use in season was generally between two and five times per week, with a mean of four times across all sites. But many households consume them daily. Use in winter was less than in summer. The mass of wild edible herbs consumed ranged from 12 kg to over 130 kg per household per year. Local (farm-gate) prices ranged from R2.65 to R72 per kilogram, but were generally between R30 and R40 per kg. Direct-use value to consuming households ranged from R85 to almost R5000 across the eight sites, with a mean of R1020 per user household per year. Although harvesting of wild herbs takes time, the high gross direct-use value represents a considerable saving on having to purchase commercial alternatives. Key species differ from place to place both in availability and use, and include both indigenous and exotic species. Commonly used genera include Amaranthus, Bidens, Chenopodium, Cleome, Corchorus, and Momordica. The use, value and trade in wild edible herbs currently receives no recognition in land and agrarian reform policies. It is imperative that this be addressed, and the relationships between rural livelihoods, use of wild edible herbs, food security, and land and resource tenure be clarified, and debated within the policy forums around different models for, and delivery of, agrarian reform and rural development.
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- Authors: Shackleton, Charlie M
- Date: 2003
- Language: English
- Type: Article
- Identifier: vital:6652 , http://hdl.handle.net/10962/d1007063
- Description: The prevalence of use and commercial value of wild edible herbs in South Africa is examined from four recent quantitative studies at eight different sites. The use of wild edible herbs was widespread in rural communities, with over 90% of households using them in all but one sample site. Mean frequency of use in season was generally between two and five times per week, with a mean of four times across all sites. But many households consume them daily. Use in winter was less than in summer. The mass of wild edible herbs consumed ranged from 12 kg to over 130 kg per household per year. Local (farm-gate) prices ranged from R2.65 to R72 per kilogram, but were generally between R30 and R40 per kg. Direct-use value to consuming households ranged from R85 to almost R5000 across the eight sites, with a mean of R1020 per user household per year. Although harvesting of wild herbs takes time, the high gross direct-use value represents a considerable saving on having to purchase commercial alternatives. Key species differ from place to place both in availability and use, and include both indigenous and exotic species. Commonly used genera include Amaranthus, Bidens, Chenopodium, Cleome, Corchorus, and Momordica. The use, value and trade in wild edible herbs currently receives no recognition in land and agrarian reform policies. It is imperative that this be addressed, and the relationships between rural livelihoods, use of wild edible herbs, food security, and land and resource tenure be clarified, and debated within the policy forums around different models for, and delivery of, agrarian reform and rural development.
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The stories in the details:
- Authors: Kyazze, Simwogerere
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159177 , vital:40274 , https://hdl.handle.net/10520/EJC146272
- Description: A famous journalism adage is that "the story is in the details". For the world Information Society, those details might be in the mind-blowing technological advances in recent years and the dizzying alternative news sources; and in the increased novelty in story telling.
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- Authors: Kyazze, Simwogerere
- Date: 2003
- Language: English
- Type: text , article
- Identifier: http://hdl.handle.net/10962/159177 , vital:40274 , https://hdl.handle.net/10520/EJC146272
- Description: A famous journalism adage is that "the story is in the details". For the world Information Society, those details might be in the mind-blowing technological advances in recent years and the dizzying alternative news sources; and in the increased novelty in story telling.
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