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What encryption algorithm is better to use?
client-Delphi, server-Python.
Recommend please simple algorithms and libraries ..
If you are looking for simple algorithms (not simple encryption) then two come to mind:
XTEA
RC4
Both are really simple and could be easily implemented in any language and both are very fast. XTEA is also secure. At least if you are not looking to protect national secrets :) I have an XTEA implementation for Delphi that works under newest delphi versions. Look here.
I also found a Python version: http://code.activestate.com/recipes/496737/
This question is far too open ended.
Your best bet for using the same library in both Delphi and Python is mcrypt. It contains a sizable cipher suite. I recommend AES / Rijndael for just about everything. It's a nice block cipher and is used almost everywhere.
You can also try the Delphi Encryption Compendium. It features the most popular algorithms and is quite easy to use due to it's OO layout.
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As an old C/C++, C#, Java, JS, PHP programer, I just couldn't get used to Objective-C. The reasons are obvious. I want to continue developing iOS applications and continue using Xcode storyboards. But I seriously need an alternative to Objective-C, is there any powerful tool or framework alternatives that could help me get away from Objective-C?
By powerful alternative, I mean useful enough to use most of the device methods/functions easily and has a lot of online resources, tutorials, examples on it.
I would very, very strongly recommend that you get a good Objective-C book, or work through the Stanford iOS development course on iTunes U. Without Objective-C, you will get a lot less help with other languages, you won't be able to understand code samples, you won't understand the iOS documentation.
Try http://xamarin.com/ios - this allows you to write in C#. Personally I've used all those languages as well (other than C#) but actually prefer Objective-C.
You might want to consider RubyMotion - http://www.rubymotion.com
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Is it better to implement blob(connected component) handling manually in openCV or are there any good libraries for the same? I found cvblob and cvBlobsLib? Are these libraries used on a standard scale?
I also looked into this and decided in the end to write my own CCL routine. It seems like a serious omission from OpenCV and no doubt a lot of people are "reinventing the wheel" as a result. Note however that you may be able to use findContours, depending on your exact requirements - see this question.
You should take a look at the new opencvblobslib. It has great features like multi core support.
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Could you recommend an open source library written in F# which provides generic types for FA construction and basic algorithms (NFA to DFA transformation, FA minimization ...)?
My first thought would be to use the state machine monad, which has be blogged/written/discussed/produced several times, a couple of references are below.
http://fsharpcode.blogspot.com/2008/12/f-state-monad-type-state-state-state-of.html
http://codebetter.com/blogs/matthew.podwysocki/archive/2009/12/30/much-ado-about-monads-state-edition.aspx
although this doesn't give you the translations you want...
Might be a place to start.
Probably not what you are looking for but a quick and dirty way to get some FA things working would be to write an equivalent context free grammar for your FA then using fsyacc?
Jolt.NET
It does not fulfil all your requirements: It's in C#, and it does not seem to support translation to DFA or minimization. At least it's usable from F# and could be used as a starting point. I've never used it myself, so I can't vouch for its suitability or quality.
See also NFA/DFA implementation in C#
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I'm seeking a library, technique or advice on how to read an EAN-13 barcode from an image (including ISBN,and ISSN encodings).
The image would come from a mobile phone or webcam, so resolution may be quite poor and not well aligned.
I'm specifically interested in something that could be used from ruby on rails, but answers for other languages are welcome. Open Source solutions preferred.
Leading solutions to date:
ZBar (previously known as Zebra - h/t #bgbg, #Natim) - implemented in C with interfaces for Python, Perl, and C++
ZXing (h/t #codr) - implemented in Java (J2SE and Android) with other modules/ports in varying states of development (JavaME, C#, C++, JRuby, RIM, iPhone/Objective C)
The zebra barcode reader (http://zebra.sourceforge.net/) is a small, layered bar code scanning and decoding library implemented in C (C++ wrappers are also provided). It supports many popular symbologies (types of barcodes), including EAN-13. However, I'm not aware about any Ruby bindings. The library is available under the GPL
This project might be what you're looking for: ZXing
You might want to try this if it's to allow your site's visitors to scan stuff, I think it's embeddable in your own site, but I've never used it : http://en.barcodepedia.com/
We use the Softek library.
Very pleased with the results.
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I am looking for good tutorials that go through every step of creating an AR application. It would be beneficial if it also covers some of the theory behind optics and such.
A good setup is to use ARToolKit plus osgART.
The tutorial of ARToolKit also explains also some of the principles of Computer Vision:
http://www.hitl.washington.edu/artoolkit/documentation/
osgART is the ARToolKit for OpenSceneGraph and abstracts some of the principles of using a computer vision based tracking in a scenegraph application
Both toolkits have a large and vibrant development community.
MXRToolkit have good documentation and is suitable for beginner. There are some other toolkits too.
http://mxrtoolkit.sourceforge.net/
Not a trivial learning curve but OpenScenegraph is probably the main FOSS app for large applications like flight simulators.
I haven't used it but it might be worth looking at: http://developer.qualcomm.com/ar