Skeletal Age Identification System On The Wrist Characteristics Of The Bone Contour Extraction Method

The task of this dissertation is to study how to apply different edge detection techniques to Segmented Bone in Bone Age Determination System. In this Paper, we not only try many traditional edge detection methods but also apply Snake model which combinate priori knowledge to this dissertation.After abtain characterize Bone,we can extract the edge from aim as foundation of later aim's shape analysis and Age Determination.it is very important and useful of edge information in a image. Using edge information, we can get some high level knowledge by which we can finish age determination. Edge is the result of discreteness of gray value, so tradition edge detection techniques include of differential methods and liner filter methods. In defferential methods, we construct edge detection operator through some little neighborhood around the pixel in a image. But there' is conflict between precise edge detection and noise filter, also we always get discrete edge by this method. In liner filter method, for using smooth filter at first and detecting edge in different scales, it can resolve conflict mentioned before in some area,but it can't resolve it basically.Snake Model is a Model of edge detection which from top to bottom.the model take advantage of priori information,and pay attention to edge itself and nearby,so it improve the accuracy and reliability of edge detection.using the Model can past discrete region of edge,then can get total edge.The Snake Model is based on the hypothesis: border is continuous and smooth.So it can be used to approximate object's position and shape in image.Snake Model set some control points around edge at first,then use image information,external limitation and continuity of curve to define a energy function.the function effect on every control point and make the point move to energy-minimizing region.when the value of the function can't be decrease, we can get the final object's edge.The Snake Model have many problems in practice application,just as how to select initial contour.shrink contour and contour's shape control etc. These problem iscaused either by Model itself,either by different problem field.In this paper,according to concrete application,we improve Snake Model's internal energy and image energy,also add according external energy. We can get better detection result through this improved Snake Model.At the last part of this paper, we conclude the whole paper, then expect to obtain accuracy initial contour model through PDM Model and introduce concept of fuzzy toexpress relevant characteristic in the process of edge detection.