There are fractures in local regions after extracting outlines of cone beam CT(CBCT) mandible images by conventional segmentation algorithm in the forensic test, therefore, this paper proposes a new method to avoid negative impact of fractures by the Erosion-reconstruction and Dilation- reconstruction of mathematics morphology (ERDR) algorithm to improve the accuracy of auto-extracting mandible outlines. The experiments show that the ERDR had a higher success rate (82.3%) in the processing of extracting the outlines of 300 mandible images than that of conventional segmentation method(24.0%).
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