Methods of compensating for the influence of differences in the reflectivity of objects to improve the accuracy of constructing depth maps using an active-pulse television measuring system

The influence of the reflectivity of objects on the accuracy of constructing a normalized depth map of space using an active-pulse television measuring system is considered. Brief information about the system, its structure, principles of measuring range and constructing depth maps with its help is given. Eight video files obtained as a result of experimental studies in a large aerosol chamber using an active-pulse television measuring system in the multi-zone range measurement mode and multi-zone range measurement with modulation are taken as material for the study. A method for subtracting coefficients is proposed, which ensures the elimination of the discrepancy in the relative brightness values on the normalized depth map between dark and light objects located at the same distance from the system. The method is experimentally tested. A comparison of the proposed method and the method of subtracting a dark frame is performed according to the criterion of minimizing the root-mean-square deviation of the depth measurement between dark and light objects. As a result of applying both methods, the mean square deviation was reduced by 1.3 to20 times, depending on the minimization method and the range measurement method used in the system. The coefficient subtraction method can only be used in post-processing, but it shows better results than the dark frame subtraction method, which can be used in real time.