A method and apparatus for stereoscopic measurement of an actual value of depth in a subject through its three-dimensional image obtained from two stereoscopically photographed films by utilizing three factors, that is, the center of optical axis of an X-ray tube or a camera which is indexed from the films at the time of stereoscopic photography, distance of movement from the first photographic point to the second photographic point and distance from the X-ray tube or the lens to the film.

Method and an apparatus for stereoscopic measurement utilizing a three-dimensional image

Picture processing: 1974

Automation in photogrammetry: Recent developments and applications (1972–1976)☆

https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=7272&context=rtd

Contour and orthophoto mapping by optical matched filter correlation of complex exponentiated stereotransparencies

CONTOUR VISUALIZATION USING COHERENT OPTICAL SYSTEMSAlan WertheimerLeeds g Northrup Co.North Wales, Pa. 19454andM. Parker GivensThe Institute of OpticsRochester, N.Y. 14627IntroductionThis paper discusses two optical process-ing systems for the rapid extraction of con-tours from a pair of stereo transparencies.For a given x- parallax, these systems pro-vide a display of all contours present at theelevation corresponding to the parallax set-ting.Two assumptions form the basis for theapproaches described here. The first is thatthe photography is taken vertically, or hasbeen rectified to a vertical orientation, sothe stereo images of all points at a givenelevation have the same value of x- parallax.Accordingly, when the stereo transparenciesare overlapped and registered properly, imagecoincidence occurs for all areas at one spe-cific elevation. The task, then, is to lo-cate these regions of image coincidence andisolate them from the rest of the scene.The Positive -Negative SystemOne technique for defining the areas ofmatching imagery is to make a positive trans-parency from one input photograph and a neg-ative transparency from the other. A simpli-fying assumption is that the copies are madewithin the straight line portion of the H & Dcurve, where the slope is defined as the con-stant, y. With T1 (x,y) and T2 (x,y) repre-senting the intensity transmittances of theinputs, the copies TA and TB, may be expressed

Contour Visualization Using Coherent Optical Systems

TWO OPTICAL PROCESSING SYSTEMS FOR RAPID CONTOUR GENERATION FROM VERTICAL TRANSPARENCIES INCLUDE: THE POSITIVE-NEGATIVE SYSTEM THAT USES TRANSPARENCIES PROCESSED TO PLUS AND MINUS VALUES OF GAMMA, AND PRODUCES DARK CONTOURS ON A STRUCTURE FILLED BACK-GROUND; AND THE SCATTER-PLATE SYSTEM IN WHICH MATCHING IMAGERY PRODUCES BRIGHT CONTOUR BANDS ON A DARK FIELD. FOR A GIVEN X-PARALLAX SETTING ALL CONTOURS ARE DISPLAYED SIMULTANEOUSLY. EXPERIMENTAL WORK TREATS CLOSE-RANGE PHOTOGRAMMETRIC EXAMPLES. MATHEMATICAL AND EXPERIMENTAL METHODS PROVIDE A DETERMINATION OF THE HEIGHT DISCRIMINATION.

Rapid contour generation

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Rapid contour generation