OPTICAL FEATURE AND RECOGNITION

TECHNIQUEOF ANOMALY EDGE OF MICRO
ACCESSORY INTERNAL HOLE

CHENG Pengle  ZHANG Zhijing  ZHANG Lin  DU Fang

(School of Mechanical and Vehicular Engineering, Beijing Institute of Technology, Beijing 100081 )

Abstract: With developed microscope measurement system, a research is made in the optical feature of the anomaly edge of minor accessory processed by means of quasi-LIGA. An approach of burr recognition on the basis of variation of gray-levels is proposed, and a simple means of measuring the thickness and highness of a burr is developed, with the precision reaching 5 μm. On the basis of gray-graph, the threshold value required in the thresholding transformation function is educed; The binary image is differentiated with a Laplacian, and then the edge of minor accessory is detected exactly. A comparison, which illustrates the feasibility of maximum incircle with respect to data and image, is made between the least square fit and the maximum incircle, and an image processing method is developed to measure the internal hole of micro accessory.

Key words: Micro accessory Least square fit Maximum incircle Burr

CLC No: TG806

Received 20051027, received in revised form 20051212