The paper considers aspects of an experimental research of the inhomogeneity of the spatial distribution of the absolute sensitivity of multielement photodetectors based on CCD and CMOS structures. The relevance of this research is associated with the need to calibrate optical radiation photodetectors in high-precision instruments to achieve specified measurements, recognition or measurement of parameters of objects of observation. Accuracy distributions on the photosensitive matrix working area are obtained, which make it possible to simplify the geometric distortion correction algorithm, improve the calibration scheme, and reduce the load on the digital processor. In this work, the choice is substantiated and a scheme of the installation is proposed for conducting experimental researches of the spread in the sensitivity of the photodetector at the working site. The results obtained in the course of the research can be used in the calibration of multi-element optical photodetectors to take into account the influence of the uniformity of their sensitivity over the site, in measurements during digital image processing.
KEYWORDS: Video, Cameras, Signal to noise ratio, Photodetectors, Interference (communication), Sensors, Power supplies, Temperature metrology, Light sources and illumination, Visualization
Digital video cameras are the main component of both visual and measuring optoelectronic devices. The parameters and characteristics of video cameras can be varied significantly for each instance. Since the characteristics of a video camera mostly determine the characteristics of the entire device, it is important to monitor them. This will ensure the stability of the characteristics of video cameras, and consequently, image stability and improvement of measurement accuracy in the case of using video cameras in optical-electronic measuring devices. This paper presents an experimental test bench designed to study the parameters of serial video cameras based on CMOS matrix photodetectors. Method are proposed for determining such camera parameters as irregularity of photosensitivity around the site, as well as change in the signal-to-noise ratio with variations in the level of exposure, exposure time and amplifier coefficient.
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