Data compression Wikipedia entry:
- aka "source coding"
- Data compression is the process of encoding data using less information (bits) than the original file
- Both the sender and the receiver must understand the encoding scheme.
- Lossless vs. lossy compression - clumsy language?
- Lossless: uses algorithms of statistical redundancy to reduce loss of information
- Lossy: guided by data of perception research - assures that information lost in compression will not be critical
- Lossy compression schemes are often used with music and images, because a certain amount of information can be lost without changing the user experience, due to limits of human perception
Data compression basics (DVD-HQ article)
- This series of articles, though long, did a good job of explaining the differences between lossless and lossy compression.
- Good background on the physiological reasons that lossy compression works
- The greyscale example was particularly helpful
- Raises some interesting philosophical arguement - is there value to archiving the entirety of a file, without compression, even though the information lost during compression is imperceptible?
Edward A. Galloway, "Imaging Pittsburgh: Creating a shared gateway to digital image collections of the Pittsburgh Region."
- Purpose of project: to create a single Web gateway to the photographic collections of the Archives Services Center (Pitt), Carnegie Museum of Art, and the Historical Society of Western PA.
- Project partners had communication difficulties between the different institutions
- Challenges in selcting photographs to be represented
- Metadata complications - agreed on elements of Dublin Core, but each institution had their own needs concerning metadata that were not being met
- Site is still in operation, and appears to have been expanded quite a bit - http://digital.library.pitt.edu/pittsburgh/
Paula L. Webb. YouTube and libraries: It could be a beautiful relationship. C&RL News, June 2007. Vol68, No. 6.
- This simple article describes several ways libraries could use YouTube to promote their services.
- It does not address the fact that some libraries block YouTube entirely, so that patrons would only be able to access these videos elsewhere.
- It makes sense for libraries to use YouTube for promotion, especially when working with young people.
- YouTube is very simple to use, so it shouldn't be intimidating for librarians.
- But - how many libraries have a way to capture video?
5 comments:
Your comment about the You Tube article was interesting. I hadn't thought about libraries blocking You Tube, that would kind of nix the "how to use the (blank) in the library" instruction. I guess it may be accessed outside of the library - but can you imagine the librarian (or other staffer) saying - "We have a video of how to do that, but you have to go somewhere else to view it."
Most point and shoot digital cameras can now capture videos. I can imagine that most libraries can easily get access to an inexpensive digital camera, even if it means borrowing one from a friend, family member or patron.
Valerie,
I had made the same comment about YouTube. I know it's blocked in my district due to the nature of some of the videos. I also suggested TeacherTube. I have used that and it's not blocked. I don't know if other libraries would be different.
Rian
I was not aware that libraries blocked YouTube, but see why it would be a good idea. I think as a was to "advertise it would still work. Our local high school has a "TV production class" that airs the school news at the school. I wonder if a partnership with the Public Library to create YouTube-type presentations would be possible. The library would get the benefit of the schools equipment, and the students would get the benefit of the experience as well as the contacts made in the library.
Wow- I'm impressed that your library systems had the guts to block Youtube- mine is much too placating to do that. (Forget that we have issues with content displayed pretty much daily.)
I am so excited to hear about Teachertube! I've never heard of this before! I'll have to email staff members as soon as I am finished blogging---.
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