Method of the Binarization of Images of Traces on the Shot Bullets for the Automatic Assessment of Their Suitability to Identification of the Fierarms

Introduction. Nowadays, automatic identification of weapons on electronic databases involves the analysis thousands of images of similar tracks, including images which are not suitable for identification. It is necessary to exclude from the analysis traces not suitable for identification for reduction of volume of calculations and increase of their efficiency. The aim of this work is the analysis of methods for assessing the suitability of traces to the identification and develop image binarization techniquie, which ensures minimal distortion of the width tracks on traces on the shot bullets. Theoretical analysis. There are two methods for evaluating of the suitability of dynamic traces to identify the weapon. The first is to count the number of lines, the width of the tracks and the spaces between them. The second is to find the autocorrelation function (ACF). The ACF form is close to a delta function form for a trace suitable for identification. The second method is more promising for the analysis of traces on the shot bullets. Experimental part. The authors proposed an image binarizatiom technique based on the construction of the image brightness profile. Application of this technique to images of dynamic traces, which are oriented vertically, allows adequately display the main tracks on binary images. Conclusion. The proposed method allows to get a binary image of traces on the shot bullets suitable for automatic analysis of their suitability for identifying and further comparing traces.