Fig. 3
From: Unsupervised learning approach to automation of hammering test using topological information
Illustration of the proposed weight associated to each sample: a disc centered on the spot hit with the hammer with a radius half of the Euclidian distance to the nearest neighbor. This intends to symbolize the area around the sample where it is relevant, i.e. where it could be assumed that the returned sound would be extremely similar to the one collected. The value of the radius was chosen in order to avoid overlapping