How to use createsamples utility?

edit

In this case, I think I have also to add name of negative picture in my nega.txt file. For example, neg/img1.bmpneg/img2.bmpneg/img3.bmp...neg/img1000.bmp to have 1000 backgroung pictures. Is this right or wrong ?

Actually you don't. As long as your negative file is larger than your actual face, many multiple subimages can be retrieved from it to be used as background. However I am not saying that this is a good approach, people usually use multiple 100's of negative images. But your code should work, creating samples with the same background each time. This could be the case in some specific applications, like a photo booth or so.

Thanks a lot, I have understand what you mean and I tried it. (Even if it's not the good approach for my application, I just want to be sure that createsamples utility is working well). If, I tried once, I have a message error > Illegal instruction (core dumped) and a file opencv_createsamples.exe.stackdump is created. Back to the start ... I have posted a comment for this problem, I thought I have fixed it in reinstalling Cygwin and OpenCV.

I am not using cygwin so I have no idea how to work with it. So you are saying the application just crashes down? If so, there should still be a problem with the parameters. Tried debugging it?

Yes, application crashed down and I don't know how to debug it. I have searching some information about this message error on Internet. If I'm to precise (speaking about OpenCV), I don't find anything and if I just mentionned the message error, solutions don't seem to be appropriate to my problem. Maybe, I can have some information with the stackdump file but I'm not sure.

I have choose to use Cygwin to simplify my following of a tutorial which was using Cygwin, now I have some doubts about it :)

If you are using Windows, I can only suggest using Visual Studio. Several guides on how to install openCV and run software is at the tutorials section of the docs.

The link doesn't seem to be correct :s I have already use Visual Studio and OpenCV to make a face trackin application on a Webcam. Can I also use it to create my vec file ?

Updated the link, was wrong indeed. And yes you can use visual studio to create the create_samples utility. Open a new empty C++ project, add all headers and cpp files from the create_samples directory and build it. The resulting exe will be able to do it all for you.

Sorry, I don't know if it is because of my poor English or my poor skills or both but I'm not sure to understand. If I try to resume, you advice me to create my own createsamples.exe in writing code under Visual Studio?

Yes, the code is already available under opencv_installation_folder/haartraining/. There you have files like createsamples.cpp, include it in a new project and build the project itself. Cannot make it more clear, I am sorry.