This paper describes the sharpness area visualization algorithm by contrast distribution in the image plane. The parameters of the optical system, simulating arm stereoscopic measurement system by correlation methods, for background images registration are given. The image registration system consists of a photographic lens, a Scheimpflug adapter and a CCD camera. Also the parameters of the optical system computer model with the image plane tilt are given. The simulation was performed using Zemax software. The Scheimpflug adapter allows you to combine the plane of the inclined image and the plane of the photodetector and, as a result, reduce the measurement error at the periphery of the research areas. It is not always possible to get a completely sharp. Visualizing the sharp image area allows you to select a frame region with higher measurement accuracy. Experimental background images for different combinations of viewing angles and matrix tilt and synthesized images are presented. The contrast distributions at the image plane are obtained. The influence of other factors on the contrast distribution, such as uneven illumination of the object, the structure of the background and the lens aberration is shown. The dynamics of PSF changes with the viewing angle increase for different field of view with and without Scheimpflug correction is analyzed by the model of optical system. The experimental results explanation in the approximation of a real optical system is proposed.
A criterion for evaluating the image quality correction efficiency in optical systems under Scheimpflug conditions is proposed. The limits of applicability of the geometric optics approximation are clarified for the sensor tilt angle calculating. The results of a simulation optical stereoscopic system arm for three cases: normal, oblique system not under the Scheimpflug condition and oblique system under the Scheimpflug condition are presented. The quantitative estimation of the image quality correction efficiency is performed. The ranges of object distances and viewing angles, providing the maximum image quality correction without loss of accuracy due to perspective distortion are defined.
This paper describes a technique for modelling the optical part of a tomographic system for measuring local temperatures of a gas flow. The system is based on the use of a spectral ratio pyrometer. The parameters of the optical part of the tomographic system with a lens part of two configurations are modeled: a single lens and a single lens paired with a microscope objective lens. Diagrams of scattering spots, illumination distributions in the cross section of the beam, and average values of the total radiation power in the focal plane of the optical system are obtained. Recommendations are given for the elimination of parasitic illumination in a pyrometer, as well as for further improvement of the tomographic system lens.
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