A feature-point three-dimensional measuring system of a planar array of a four-camera group and measuring method, in the technical field of products and methods of optical electronic measuring technologies, comprising establishing a measuring system of at least one four-camera group wherein four digital cameras form a 2×2 array group; matching an image feature point acquired by the camera group; upon matched feature point image coordinates, calculating coordinates of spatial locations of respective feature points; upon coordinates of the spatial locations, calculating other three-dimensional dimensions of the measured object to be specially measured to form three-dimensional point cloud data and establish a three-dimensional point cloud graph for performing three-dimensional stereoscopic reproduction. Here, full matching is performed for all measured points of the measured object by directly translating, superimposing, and comparing point by point the pixel points of measured images in X and Y-axes directions. It greatly simplifies the complex algorithm of binocular matching, achieving effect of simply, quickly, accurately, and directly measuring three-dimensional dimensions of an object with a multi-view camera.
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