Quality assessment of stereoscopic images under acousto-optic diffraction in paratellurite crystal

Subject of study. The study addresses the problem of obtaining spectral stereoscopic images in a unique configuration, where a single acousto-optical filter is utilized to filter a pair of light beams. Aim of study. The objective was to determine the nature of changes in image quality when varying the angle of beam separation in an acousto-optical filter to further optimize the spectral stereo system. Method. The imaging scheme was implemented through light diffraction by ultrasound in directions deviated from the basic plane (−110) of a TeO2 crystal cell in classical wide-aperture acousto-optical tunable filters. A test-bench was established to assess image quality characteristics during azimuthal tunable rotation of the acousto-optical cell. Main results. The spectral images stack representing the stripe and radial test-targets was recorded, and the contrast and spatial resolution values were calculated at different angles of inclination. The degradation was observed to be relatively slow, allowing for considerable variation in the inclination angle (up to 16° parallax). Practical significance. The findings demonstrate the potential of the described acousto-optic filtering scheme for a pair of beams in stereo-spectral devices, which shows promise for machine vision systems.