Consider the Gaussian kernel. Thus in practice the scale space is computed by. Blobs are obtained as local extrema of the Difference of Gaussians DoG you space, obtained by subtracting successive scales of the Gaussian scale space:..
TypeDescriptor is used to get information of a Type. To use it, you need to pass a component to its static methods. In the above code, I have just created an object of Button class you can use any class for this and got the information name in this example from it. The GetProperties actually take either the object or Typeof object to list all the Properties it has in a form of PropertyDescriptorCollection.
Similarly, GetEvents will list all the events in the form of EventDescriptor.