APPROACH TO GETTING IMAGES OF OBJECTS BASED ON INDIRECT LASER LOCATION DATA

Grigor’ev A.N., Altuchov A.I., Korshunov D.S. Approach to getting images of objects based on indirect laser location data. Scientific and Technical Journal of Information Technologies, Mechanics and Optics, 2021, vol. 21, no. 1, pp. 31–39 (in Russian). doi: 10.17586/2226-1494-2021-21-1-31-39

Subject of Research. The paper presents an approach to obtaining images of objects based on indirect laser location data. The concept of recording and processing photometric data about an object is developed, which implies the joint usage of an optical quantum generator and a camera with a photodetector based on single-photon avalanche diodes. Registration of an optical radiation scattered by an object is performed if the object is placed outside the sight line of the probing equipment, for example, behind a light-tight obstacle. Photometric data processing is aimed at the object shape modeling. Methods. Indirect laser location involves irradiation of an object with a series of light pulses and registration of scattered optical radiation. Since the object is located outside the sight line of the probing equipment, light pulses are propagated from the optical quantum generator to the surface that re-reflects these pulses in the direction of the object under study. Photometric data are formed as a registration result of optical radiation scattered by the object, propagating in the opposite direction. Vertical and horizontal scanning of the image is provided by the laser beam movement during the scanning of space. The object image is formed as a result of a series of sequential operations to extract photometric data about the object from the scattered optical radiation, calculate brightness values, and determine the positions of the raster voxels in the space of a rectangular coordinate system. Main Results. A conceptual model of indirect laser location is developed based on: a pulsed laser, scanning and focusing optical systems, a camera for scattered optical radiation recording, time synchronization device for generation and registration of light pulses. An approach is proposed to the processing of indirect laser location data, which provides three-dimensional images of objects. An experiment results are presented on the formation of an object image based on open materials of laser location. Practical Relevance. The indirect laser location system application gives the possibility to get object images in the absence of direct eye contact. The results of the image formation experiment demonstrate that when an object is placed behind a light-tight obstacle, it is possible to get a reliable idea of its structure and shape. The image obtained in accordance with the proposed approach is characterized by high graphic similarity and is a source of information about objects that are difficult to access.

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