Application of boundary-tracing and Freeman code in quantitative metallography
Yu Yang1, Liu Erli1, Zhou Tietao2, Liu Peiying2*
1. School of Mechanical Engineering and Automation, Beijing University of Aeronautics and Astronautics�� Beijing 100083, China;
2. School of Materials Science and Engineering, Beijing University of Aeronautics and Astronautics�� Beijing 100083, China
The grainy second phase of multi-phase alloy was processed by various image pretreatments according to different conditions to obtain binary image of the discreet multi-object. These image pretreatments include two-value transformation, grain segmentation, hole-filling and filtering. To analyze the multi-object, a boundary tracing algorithm for multi-object was presented. With the algorithm, the Freeman code of every grain's boundary was produced by 8 direction boundary tracing, thus the second phase characteristic parameters, such as volume fraction, perimeter, area, shape factor, mean free path etc, were obtained. The experiment results show that the algorithm is effective for discreet multi-object analysis by having done the above-mentioned pretreatments.
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