摘要:
A measurement system includes an illumination unit, imaging unit, acquisition unit and correction unit. A measurement target is irradiated with illumination light. The imaging unit captures an image of light reflected by or transmitted through the measurement target. The acquisition unit acquires positional relationship information representing a positional relationship between the illumination unit and the measurement target and between the imaging unit and the measurement target. The correction unit corrects a luminance of at least one of the illumination light emitted by the illumination unit and the captured image based on the positional relationship information in such a way as to correct a luminance change of the measurement target image, wherein at least two of the measurement target, the illumination unit, and the imaging unit are variable in spatial position.
摘要:
An automated photogrammetric instrument adapted to observe conjugate areas in a stereo-pair of photographs for the purpose of determining terrain elevation and for carrying out other measurements. In order to measure X-parallax, the instrument includes means to scan each of the photographs along a path in which X-parallax is present, but which is substantially free of Y-parallax and the effects of image rotation, thereby producing first and second video signals representative of the scanned paths in the pair of photographs. The first and second video signals are applied to a correlator to produce an output value reflecting the degree of differential X-parallax.
摘要:
The invention relates to computer-implemented method for the 3D reconstruction of a ground surface area by stereophotogrammetry, comprising the steps of:
determining corrected Rational Polynomial Camera, RPC, models by performing bundle adjustment (BA) of original RPC models each provided with an image of a set of images of the ground surface area acquired by a remote imaging sensor and each associated to a corresponding original projection function ({Pm}) from a 3D object space to a 2D image space, wherein determining the corrected RPC models comprises determining corrected projection functions ({Pmcor}) from the 3D object space to the 2D image space; and determining (PC) a 3D point cloud representative (3DPC) of the ground surface area by triangulation, based on the corrected RPC models, of stereo correspondences within images of the set of images.
In accordance with the invention, determining the corrected projection functions comprises determining, for each of the original projection function, a 3D corrective rotation around a remote imaging sensor center to be applied in the 3D space before performing the original projection function.
摘要:
An alignment system for determining the alignment of a plurality of components has a plurality of targets (2), one target being associated with each component. An optical arrangement (4, 1) is associated with each target, for selectively providing an image of the associated target within the field of view of an optical viewing device. This arrangement enables the image of a single target to be in the line of sight of a viewing device (for example telescope), so that the depth can be determined unambiguously.
摘要:
A parts processing assistance system includes a three dimensional measurement unit for acquiring a three dimensional measured data about a part, a display unit for displaying the part based on the three dimensional measured data, and a virtual assembly unit for virtually assembling the part displayed by the display unit on the display unit. According to this system, assembly error can be confirmed before an actual assembly work of parts.
摘要:
A cartographic apparatus for determination of the elevations of features and heights of objects from stereoscopic images of complementing input records includes a parallax bar and movable reticles for generating a floating mark over points of interest in the records. The apparatus also includes a microprocessor to compute compensation factors based on values determined during initial set up and means responsive to those factors to compensate automatically for y parallax and for errors in x parallax difference as the floating mark is moved and to compute automatically object heights and feature elevations.
摘要:
A measurement system includes an illumination unit configured to irradiate a measurement target with illumination light, an imaging unit configured to capture an image of light reflected by or transmitted through the measurement target, an acquisition unit configured to acquire positional relationship information representing a positional relationship between the illumination unit and the measurement target and a positional relationship between the imaging unit and the measurement target, and a correction unit configured to correct a luminance of at least one of the illumination light emitted by the illumination unit and the image captured by the imaging unit based on the positional relationship information in such a way as to correct a luminance change of the measurement target image captured by the imaging unit, wherein at least two of the measurement target, the illumination unit, and the imaging unit are variable in spatial position.
摘要:
The present invention relates to a method and tool for determining on a vehicle (V), especially an aircraft, the harmonization error of an on board equipment item (1) with respect to a vehicle reference frame (Rv). According to the invention, the tool comprises an element (4) representing the vehicle reference frame (Rv), an element (5) arranged at the site of the equipment item and representing said equipment item (1), a theodolite (6) taking measurements on said elements (4, 5), directly or through a prism system (7), an inclination meter (8) measuring the pitching on the second element (5) and a calculator (9) determining the harmonization error from said measurements.
摘要:
A system for the discontinuous transformation of visual images utilizing a variable delay. The visual image to be transformed is first converted to a time-varying video signal. This signal is then converted to a digital signal which is fed to a delay circuit whose time delay can be instantaneously varied. The exemplary delay circuit shown includes a random access memory which is usedc to store and release the stored digital information as a function of the desired delay. The output of the delay circuit can then be inverted to achieve the transformed visual image.