A few notes on the SetWithOpenCV.zip file... The SetMacOS30 subfolder contains the XCode project file for XCode 3.0. It also contains a subsubfolder named cvBlobsLib that has the _Mac OS X_ version of the Blob-extraction library The SetMacOS25 subfolder contains the project file for 2.x versions of XCode. You'll need to delete the cvBlobsLib files and re-add them (from the SetMacOS30/cvBlobsLib folder, in fact). The movie, path0.mpg, is not in the SetWithOpenCV folder. However it is in ~dodds/public_html_sigcse08/files/path0.mpg if you'd like it. The Windows/Visual Studio .sln file seems to work, but requires the following changes: 1) convert it to your version of Visual Studio 2) the path to the Blobs.h and other cvBlobsLib header files will be wrong - it's a hard-coded path. You'll need to change it to point to .../SetWithOpenCV/cvBlobsLib Note that this is a _different_ set of files than for the Mac. 3) You should delete cs154v1.cpp and add main_windows.cpp . 4) You will need to replace the hard-coded path at the top of the file to point to SetImages on your machine. Be sure to use the double-back slashes so that the path name is handled correctly. Feel free to let me know if I can be of help! Best wishes, Zach dodds@cs.hmc.edu