On 6 February 2008 at 19:11, Paul E Condon wrote: | I have a large number of scanned images of photographs. They are | scanned from prints, and for some images there are several prints. I | would like to find a program that would group similar images (similar | in some sense that approximates human perception of similarity) and | flags the slight differences within a group. I've looked on Google and | found a few programs for criminal investigation but they want $ and | seem only to exist for Windows, which I don't have here. | | I imagine that similarities could be found by image subtraction with | minimization of some measure of image difference. But I also imagine | that there are a host of complications. | | Suggestions?
The R statistical environment can also read images. IIRC it builds eg matrices of RGB values from pixeled images. You can then use various statistical measures to analyse those images. Usual caveat: that's not what I use R for, so your mileage may vary. A quick grep among the by now well over 1000 CRAN packages: [EMAIL PROTECTED]:~> links -dump http://cran.r-project.org/src/contrib/PACKAGES.html | grep -i image adimpro Adaptive Smoothing of Digital Images biOps Image processing and analysis biOpsGUI GUI for Basic image operations epsi Edge Preserving Smoothing for Images kza Kolmogorov-Zurbenko Adaptive Filter for Image PET Simulation and Reconstruction of PET Images pixmap Bitmap Images ("Pixel Maps") rimage Image Processing Module for R [EMAIL PROTECTED]:~> There may well be more. None of these packages are in Debian (even though we have some 60 or so) but are typically just a matter of $ R CMD INSTALL someCRANSourcePkg.tar.gz which you may want to run as root, or give a -l location argument to where you can write. Cheers, Dirk -- Three out of two people have difficulties with fractions. -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
