METHOD FOR INCREASING ACCURACY OF GEOMETRICAL MEASUREMENTS CARRIED OUT USING A STEREOSCOPIC DEVICE BASED ON A PRISM LENS OPTICAL SYSTEM Russian patent published in 2019 - IPC G01B9/00 

FIELD: measurement technology.

SUBSTANCE: invention relates to the visual inspection technology. Method for increasing accuracy of geometrical measurements carried out using a stereoscopic device based on a prism lens optical system, involves preliminary calibration of device based on combined processing of set of images of test object, recorded at different positions of test object relative to optical system, and calculating calibration parameters of the mathematical model of the optical system and the radiation matrix receiver, recording the image of the analysed object and processing said image, calculating coordinates of points of the surface of the analysed object in three-dimensional space and calculating geometrical parameters of the analysed object using calibration parameters. Device is calibrated jointly by several sets of images of the test object, which are obtained in narrow regions with width equal to half the maximum of less than 1/10 of the width of the working spectral range of the device, within wavelength ranges within the range of the operating spectral range of the device. Image of the analysed object is recorded in a narrow wavelength range within the operating spectral range of the device. From calculated values of calibration parameters corresponding to narrow spectral intervals, calculated calibration parameters corresponding to the range in which the image of the analysed object is recorded are calculated by interpolation of spectral-dependent calibration parameters.

EFFECT: high efficiency of using prism lens systems by increasing contrast of recorded images in narrow spectral intervals and reducing systematic error in measuring geometric parameters of objects caused by non-optimum calibration methods.

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