Patent RU-2714525-C1 (RU)
Title: Method for determining the mean square error of spatial coordinates of points of the analyzed object from image processing obtained by different cameras with arbitrary values of orientation elements
Inventor: Bezmenov Vladimir Mikhajlovich
IPC: G01S17/89
Filed: 2019-07-30
Granted: 2020-02-18
Abstract: FIELD: data processing. 
     SUBSTANCE: proposed invention relates to photogrammetry, geodesy, cartography and can be used for constructing topographic plans and maps, three-dimensional models of terrain, buildings and structures, solving engineering and geodesic tasks, for building measurement drawings of facades of buildings, determining volume of displaced soil for open pits and various drifts, etc. and is realized in practice using a computer program. Disclosed method of determining the mean square error of spatial coordinates of points of the analyzed object from processing of intermittent images obtained by different survey cameras with arbitrary values of elements of external and internal orientation, in which object overlapping images are obtained; determining the focal distance of the camera as an internal orientation element; determining coordinates of images of points of the analyzed object, obtaining values of mean square errors of determining coordinates of images of points of the analyzed object. Further, the mean square error of the spatial coordinates of the points of the analyzed object is determined by taking the value of the focal distance of the camera and the coordinates of the image of the points on the image and taking the values of the mean square errors for the coordinates of the images of the points of the analyzed object on the image. Overlapping object images are obtained using different camera cameras; determining focal distance of different camera chambers; spatial coordinates of points of the analyzed object are determined by one or more pairs of images obtained by different survey cameras; determining linear and angular elements of external orientation of different survey cameras, having any values in spatial coordinate system, in which coordinates of points of analyzed object are determined. To determine the standard errors of spatial coordinates of the points of the analyzed object, the value of the focal distance of at least two survey cameras and the coordinates of the images of the points on two images are taken. When determining the mean square error of points of the analyzed object, linear and angular elements of external orientation of survey cameras and mean square errors with which linear and angular elements of external orientation of survey cameras are determined are used. When determining the mean square error of spatial coordinates of the points of the analyzed object, the coordinates of the images of the points on each picture and the mean square error with which each coordinate of the image of the points of the analyzed object is determined on each image are used. Determining the parallactical coefficient of the method of direct photogrammetric resection, taking into account the inclination of the survey basis relative to all three axes of the spatial coordinate system; determining parameters of influence of linear and angular elements of external orientation of a pair of images, elements of internal orientation of survey cameras, coordinates of images of points of the analyzed object, measured on a pair of photographs, on accuracy of determining spatial coordinates of points of the analyzed object; determining square of mean square error separately for each element of external and internal orientation of camera cameras, for each coordinate of images of points of analyzed object, measured on a pair of photographs, taking into account error, introduced by each element of external and internal orientation and each measured coordinate; determining total square of mean square error for each of three spatial coordinates of points of analyzed object, taking into account effect of mean square errors, with which elements of external and internal orientation and coordinates of images of points of the analyzed object, measured on a pair of images, are determined, and a mean square error of spatial coordinates of points of the analyzed object is determined. 
     EFFECT: high reliability of determining the mean square error of spatial coordinates of points of the analyzed object from image processing. 
     1 cl, 5 dwg, 13 tbl