Research and application of edge detection technology in costume pattern cutting. I made a software with Visual C++6.0
to realize contour extraction of costume pattern. It also contains gray balance, Laplace edge detection, image's erosion
and so on. Besides, I deeply compared applicability of each algorithm and all combinations of them. In this experiment, I
succeed in extracting contour of complex costume patterns. Furthermore, controlling laser-cutting machine cut real
costume patterns by software. In conclude that I not only have realized automatic extracting contour and cutting by this
software in several minutes but also improved the precision of contour extraction.
Digital camera is a very effective equipment of untouched optical test in large-visual imagines collection. However, it
also has some differences between camera optical system and perspective projection. So it causes different extent of
nonlinearity-optical distortion between theory imagines and actual imagines which projected on imagine plane of camera.
It's necessary to rectify imagine distortion to improve veracity of imagine test and mode matching. Orthographic
projection, weak perspective and paraperspective projection were major researched models in most of former theses. The
former models ignore two important indexes of object and the last model has a theory problem about an angle of
incidence. Comparing with theory imagines, the actual imagines of three models have large distortion. This paper brings
forward a new model which based on orthoperspective model. First, revolving the light axes till it perpendicular to a
plane of centroid. Second, we draw projection curves which based on orthographic projection theory. This model proves
the main factors of orthoperspective distortion are revolving angle and camera foci. This model both takes fully use of
object indexes and has solved problem about incidence angle. By numerical simulation and experiment, in most of
measurement orthoperspective model has least imagine distortion and projection closest to theory imagine. If an object
has average density and some height, taking this model can enhance measure precision.