Detection of the Toe-off Feature of Planar Shoeprint Based on CNN
In Chinese forensic science, a planar footprint can provide police office lots of information, such as sex, age and gait for criminal investigation. The toe-off feature is an important feature of planar shoeprint, which can indicate the gait pattern of the walkers. However, the toe-off features of planar shoeprints are still analyzed artificially by criminal investigators, which is inefficient and subjective. In this research, a novel algorithm for the automatic detection of the toe-off feature is developed. We define the crescent feature in the toe-off feature of planar footprint as a positive sample, and define no such feature as a negative sample. We use CNN to detect them. In order to conduct the research, we take photo of planar shoeprints by the way of criminal scene photography. After performing some pre-processing steps on these pictures, we set up a planar shoeprint database. Experimental results show that the proposed method achieves detection accuracy of 97.0% on our planar shoeprint database.
KeywordsToe-off feature Planar shoeprint Convolutional Neural Network Detection
This work is supported by the National Key Research and Development Program (Grant No. 2017YFC0803506), the Fundamental Research Funds for the Central Universities of China (Grant No. 2018JKF217), the National Natural Science Foundation of China (Grant No. 61503387).
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