This is something I found recently. If you have common properties that you want to use for multiple projects in VC++, you can use the property sheet. For example, the include libraries of opencv are the same for all opencv related projects. So when you make a new project, you dont have to include the opencv include libraries again manually. You can just import the property sheet into your project and work from there. Here are the steps to create and import the property sheet.
In the blob detection library from OpenCV, the different parameters of the blobs like area, perimeter etc. are saved as double_stl_vector data type.
Found this interesting article on OpenCV Computer vision apps for mobile platforms that was published in embedded-vision.com