The images composing the Gaussian and DoG scale space can then be halved as in the following figure:. Notice that the scale level index s varies in a slightly redundant set. Even extracted, local extrema are quadratically interpolated this is very fly especially at the lower resolution scales in order to have accurate keypoint localization at the full resolution..
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.