Determination of the Position of the Laser Spot in the Plane of the Photo Sensor of the Multimedia Shooting Gallery

Abstract

One of the key problems of the operation of a multimedia shooting gallery with a laser emitter is investigated - the recognition of a laser spot and the determination of its centroid in the plane of the photosensor. The analysis of the factors influencing the reliability of detection of the laser spot and the accuracy of determining its centroid is carried out. Based on the analysis, an algorithm for positioning the laser spot through a 2-stage binarization of the image was developed. At the 1st stage, a fragment with a laser spot is highlighted, at the 2nd stage, the centroid of the spot is determined. Experimental studies have been carried out to determine the optimal binarization thresholds. The reliability of the laser spot detection according to the developed algorithm is 99.9%, which is higher than the indicators for the existing models of laser shooting ranges (95%). Good interpretability of the algorithm allows you to explain hit inaccuracies caused by random factors in order to eliminate them. The performance of the algorithm is high due to its maximum possible simplicity and the minimum number of iterations. The program processes a frame when shooting video at a rate of 25 frames per second. The accuracy of determining the centroid coordinates according to the proposed algorithm is within 0.5 pixels at a photosensor resolution of 1280 * 720. This figure is consistent with the accuracy of other approaches to positioning a laser spot on a raster image