Patent ID: 8872913

Claim:
A system for positioning micro tool of a micro machine, comprising: a micro machine, including: a micro tool for processing a precision working to a workpiece; a platform for providing a base to processing said workpiece; and a precision arm for controlling a position of said micro tool; a first image capturing device and a second image capturing device, respectively mounted at two sides of said micro machine, for capturing horizontal and vertical images of said micro tool and said workpiece, wherein said two sides are perpendicular to each other; a positioning device, comprising: an image input interface for receiving said horizontal and vertical images of said micro tool and said workpiece captured by said first image capturing device and said second image capturing device; an image edge analysis unit, coupled to said image input interface, for applying an image edge manner to analyze borders of said horizontal and vertical images of said micro tool and said workpiece into border horizontal and vertical images of said micro tool and said workpiece; a relative position analysis unit, coupled to said image edge analysis unit, for applying an analyzing relative allocation manner to analyze said border horizontal and vertical images of said micro tool and said workpiece into location discrepancies of said micro tool and said workpiece; a code transferring unit, coupled to said relative position analysis unit, for converting said location discrepancies to a code; and an output interface for transferring out said code; and a controller for receiving said code to position said micro tool into precise location; wherein said analyzing image edge manner comprises: removing noise from the said horizontal and vertical images of said micro tool and said workpiece; calculating a gradient representing a grey level variation of neighbor to a pixel in said horizontal or vertical images by using a first or second order partial derivative; assuring which pixel is edge; and denoting a pixel coordinate on said horizontal or vertical images if the pixel is determined as edge wherein said analyzing relative allocation manner comprises: calculating vertical pixel discrepancy of said micro tool tip to a processing point of the workpiece; calculating horizontal pixel discrepancy of said micro tool center point to the processing point of the workpiece; calculating average of profile central position according to said horizontal and vertical images of said micro tool with said different adjusted directions; and transferring pixel unit of said vertical and horizontal pixel discrepancies into length unit to obtain locational discrepancies from said micro tool to the workpiece.