Image processing is based on signal processing. Here's one introductory guide to the latter.
The Scientist and Engineer's Guide to Digital Signal Processing http://www.dspguide.com/pdfbook.htm See Convolution and Correlation topics, which help illustrate how should cross_correlation tutorial below works. Also has many special and advanced image applications examples. See also Filtering Using imfilter in Matlab http://www.mathworks.com/access/helpdesk/help/toolbox/images/f16-21115.html A general question: how feasible (and moral) it is to try to implement things like normxcorr2 in J? --- Devon McCormick <[EMAIL PROTECTED]> wrote: > A couple of other references: > > http://www.owlnet.rice.edu/~elec431/projects96/pictomaniacs/previous.html - > explains the relation of cross-correlation to convolution; this is part of > http://www.owlnet.rice.edu/~elec431/projects96/pictomaniacs/DSP.html - > a tutorial on digital signal processing applied to pattern matching. > > On 2/28/07, Devon McCormick <[EMAIL PROTECTED]> wrote: > > > > Gosi - > > > > how is your image pattern recognition going? > > > > This is a subject in which I'm interested. I just now came across a > > couple > > of references I found when looking into this: > > > > > > http://www.mathworks.com/products/demos/image/cross_correlation/imreg.html > > - a step-by-step > > tutorial in recognizing embedded images using Matlab > > http://students.ee.sun.ac.za/~riaanvdd/image_processing_tools.htm - > > link to a method called > > the Fourier-Mellin transform > > http://www.idiom.com/~zilla/Work/nvisionInterface/nip.html - "Fast > > Normalized Cross-Correlation" by > > J. P. Lewis of Industrial Light and Magic (the famous animation studio) > > > > A good phrase on which to search is: "normalized cross-correlation". > > > > Good luck, > > > > Devon > > > > On 2/26/07, Bj�rn Helgason <[EMAIL PROTECTED]> wrote: > > > > > > I have GUI both on my Windows machine and the Linux machines. > > > > > > I will give JAL a go soon. > > > > > > It seems a bit silly to have to start editing the addons before I can > > > use > > > them. > > > > > > I am sure I am looking in the wrong places at the moment where to put > > > the > > > JHP and CGI code. > > > > > > PS: I was starting to do some silly editing around the XML tags I wanted > > > to > > > use. > > > > > > By using a simple locale I can gather the data quite easily by > > > using a > > > construct like this: > > > (ELEMENTTEXT,'_COLLECT_')=:y NB. in the character verb > > > creating the noun ELEMENTTEXT in the verb startelement > > > > > > Now I got all the names from the xml file in the locale COLLECT > > > > > > The XML addon is great! > > > > > > > > > 2007/2/26, Oleg Kobchenko <[EMAIL PROTECTED]>: > > > > > > > > If you have GUI on Linux, you can use Package Manager. > > > > Otherwise, you can copy the addons manually. > > > > > > > > But it is important to install the latest base library. > > > > It does not have any breaking features, only things to > > > > work properly esp. with JAL. > > > > > > > > Note JHP can be used without <% %> notation, just like > > > > plain CGI. See the examples folder, esp. image generation. > > > > > > > > > > > > > > > > --- Bj�rn Helgason <[EMAIL PROTECTED]> wrote: > > > > > > > > > Lets say I am a bit behind trying to catch up a lot of new things > > > todo > > > > in J. > > > > > > > > > > I am beginning to get a hang of how I can use XML > > > > > The image stuff I am sort of beginning to get the hang of > > > > > I have spen some time on JHP and have managed to get apache working > > > and > > > > > tried out a few things but am mixing it a bit with CGI as well. > > > > > I guess I need to configure and understand Apache a bit better so I > > > can > > > > > understand where to place the directories, where to put what and > > > what > > > > > scripts to change and how. > > > > > > > > > > So adding JAL into the equation has not been on right now. > > > > > Maybe that is wrong but I have seen messages about JAL changing the > > > way > > > > > things work and at the moment things are complicated enough as it is > > > for > > > > me. > > > > > > > > > > I am also working sometimes on a Windows and sometimes on Linux so > > > it > > > > can be > > > > > a bit of a task of understanding what is to go where. > > > > > > > > > > It is also interesting that some of these things are done with > > > Jconsole > > > > and > > > > > others with GUI > > > > > > > > > > Apache seems quite interesting. Unfortunately I have never > > > configured it > > > > > before and it seems to offer quite a bit of possibilities and that > > > does > > > > not > > > > > make JHP all that easy for me right now. Let alone the CGI part. > > > > > > > > > > 2007/2/26, Oleg Kobchenko <[EMAIL PROTECTED]>: > > > > > > > > > > > > --- Bj�rn Helgason <[EMAIL PROTECTED]> wrote: > > > > > > > > > > > > > It is getting tricky not to use JAL > > > > > > > > > > > > > > found this line giving file name error > > > > > > > require 'media/platimg/',tolower UNAME > > > > > > > > > > > > > > change > > > > > > > > > > > > > > to > > > > > > > > > > > > > > require '~addons/media/platimg/',(tolower UNAME),'.ijs' > > > > > > > > > > > > Why can't you use JAL? ____________________________________________________________________________________ Be a PS3 game guru. Get your game face on with the latest PS3 news and previews at Yahoo! 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