Comment:
Chris
Summary:
In this paper, the author focused on preprocessing steps for sketch recognition, especially for corner finding in stroke, fitting lines and curves. Generally, the early prorecessing consists of three phases, approximation, beautification and basic recognition, respectively. The most appealing part of this paper is the part of explanation of finding corners. The author uses two kinds of graph, Curvature graph and speed graph. From careful examination, author found that people tends to slow down at each corner of the stroke, which is a very intuitive idea. The author also found that using curvature graph only or speed graph only cannot find all the corners very effectively, this is the reason why author combined these two graphs to detect vertices, which gives good results. In the remaining part of paper, the author also shows the approach of how to handling curves as well as fitting problem.
Discussion:
Paper is excellent. I am very into the first part of paper that find the corners. I like the idea of using speed graph, it is really interesting and intuitive for me. Even though in some cases, this does not gives good result, generally, it is true that people tends to draw slowly at each corner of stroke. Thus, speed graph, definitely is good, then how about the acceleration graph, which is the deriative of speedy graph. I think we can also use acceleration graph for this purpose.. furthermore, derivative of accelaration graph, I am not sure if it useful or not, however, we could try.
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