THE METHOD OF BULLET IDENTIFICATION BASED ON VALID LINE EXTRACTION

Taking the microscopic features of the 3D lands the raised areas between the grooves in a firearm barrel trace area as the research object, this paper studies automatic lands trace identification by using a line feature extraction method based on the finite ridgelet transform FRIT and a texture analysis method based on the gray level co- occurrence matrix GLCM. The 2D average profile WAP was improved. Along the inclined direction of the stripes, each valid stripe was subjected to weighted averaging to obtain a 2D WAP, so as to suppress the interference of invalid areas in the land traces. To verify the effectiveness of the proposed automatic lands trace matching method, experimental verification was carried out using a control set and a verification set. Compared with two comparative experiments, the results show that this method is the best and is the only one that can completely distinguish between known matching bullets and known non-matching bullets.