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URN etd-0825105-134845 Statistics This thesis had been viewed 3443 times. Download 2160 times. Author Kuo-Yuan Chen Author's Email Address email@example.com Department Mechanical Engineering Year 2004 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 77 Title The Automatic Measuring Strategy Design for CMM Based on Image Processing Keyword photometric stereo technique Image Processing Back-propagation neural network Back-propagation neural network Image Processing photometric stereo technique Abstract CMM is the general measuring equipment. The user can measure the surface of the object by using the probe in a fixed distance and this measuring strategy is the general measuring one. But, the surplus data point in the surface of the object will be caused with this method and the point points are not enough in the surface. Both of these is not good for the processing of the data and the re-establishment of the surfaces.
In this research the BPN is used to replace the integrated illumination with photometric stereo technique to plan the measuring strategy with the CMM. According the strength of the reflective light, the measuring materials, characters of the surface and shape of the measuring object, the measuring strategy of the photometric stereo technique is the illumination model from the three different positions of the lightsource and the normal vector of the measuring point is obtained by using mathematic algorithm. Because there are many parameters in the equation and no standard value, BPN is used to find out the normal vector and the normal vector of every measuring points are used to place the measuring points so that the measuring time and the number of the surface-reestablished can be reduced effectively. Instead of the mathematic algorithm, BPN connect the relation of the input gray value and the output normal vectors by the complicated weighted value so that the question that using numerical analysis used to solve the mathematic equation does not always can be solved convergence and the measuring time can also be reduced. Furthermore, the normal vectors of every measuring point can be used directly in the direction of the probe when measuring so that the measured data does not have to be enhanced.
Advisor Committee Ching-Chih Tai - advisor
Wenchou Chen - co-chair
Files Date of Defense 2005-07-30 Date of Submission 2005-08-25