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The edge detection plays a critical role in medical application, Edges characterize boundaries are fundamental problem in image processing. The paper illustrates the way by canny algorithm detecting the weak edge of brain,then labeling all the 8-connected edge with a different number and classifying with the that edge, for the size of all the 8-connected edge circumference being different, So we can plot the histogram according to the size of the edge, At last, we can detect the sole weak edge by the histogram segmentation. This way can help us get the deformable edge such as brain tumor.

We design and implement a cross-platform extendable Virtual Reality system with the MVC design pattern. It aims on cross-platform usage and extendibility which makes users to write VR applications much more easily. And the system can run on multiple platforms like Linux and Windows. To achieve extendibility, we embed the system with the Python script module which makes the system easy to be extended with specific VR logics for making various VR applications efficiently, also we implemented the system by using platform-independent libraries (like OGRE, Python) to achieve cross-platform usage.