Showing papers on "Orientation (computer vision) published in 1973"

Computer identification of textured visual scenes

Abstract: : The work deals with computer analysis of textured outdoor scenes involving grass, trees, water and clouds. Descriptions of texture are formalized from natural language descriptions; local descriptors are obtained from the directional and nondirectional components of the Fourier transform power spectrum. Analytic expressions are obtained for orientation, contrast, size, spacing, and in periodic cases, the locations of the choice of sizes is made by a simple higher-level program. The process of region growing is represented by a sheaf-theoretical model which formalizes the operation of pasting local structure (over a window) into global structure (over a region). Programs were implemented which form regions of similar color and similar texture with respect to the local descriptors.

Orientation of continuous-strip imagery

Abstract: THREE SCHEMES ARE SUGGESTED FOR THE RELATIVE ORIENTATION OF CONTINUOUS-STRIP IMAGERIES PRODUCED BY STEREO SYSTEMS: (1) LINE-TO-LINE ORIENTATION METHOD, IN WHICH TWO LINES OF CORRESPONDING POINTS ARE ORIENTED RELATIVELY: (2) SECTION-TO-SECTION METHOD, IN WHICH THE STRIP IS SUBDIVIDED INTO SECTIONS AND IT IS ASSUMED THAT ORIENTATION ELEMENTS REMAIN CONSTANT WITHIN SUCH A SECTION; AND (3) TRIPLE-CHANNEL RECORDING SCHEME WHICH PRESUPPOSES THAT THREE SETS OF IMAGES ARE RECORDED SIMULTANEOUSLY, ONE OF WHICH IS A VERTICAL VIEW OF THE TERRAIN AND THE OTHER TWO ARE TAKEN AT DIVERGING ANGLES THE THIRD SCHEME PROVIDES THE MOST PROMISING SOLUTION; HOWEVER, AN APPROPRIATE SENSOR PACKAGE NEEDS TO BE DESIGNED AND CONSTRUCTED

Methods of Analytical Orientation of Individual Photographs in Two-Medium-Photogrammetry and Practical Tests

Abstract: In analytical orientation for a pair of two-medium photographs we have two ways; the one is the way to devide the orientation in two phases, relative and absolute orientation, and the other is the way to calculate the outer orientation elements of individual photographs according to the orientation theory in single photogrammetry. The researches of the first way have been carried out by K. Rinner1), 2) , B. Schmutter and L. Bonfiglioli3) , and A. Okamoto and J. Hohle4) , and also various methods were developed. But as shown in the reference4) , these methods have a disadvantage that the obtained accuracy is rather unsatisfied on account of the great correlations between the relative orientation elements and that some corrections are necessary to the result. Therefore, the orientation theory of individual photographs is to be considered to carry out the orientation of two-medium photographs effectively and two new methods are developed in this paper.The ground coordinate system is usually selected in carring out the orientation of individual photographs. Therefore, we have only to determine the outer orientation elements of individual photographs, when the refractive surface is given. It follows that the correlations between the unknowns are reduced. This is a great advantage of the methods proposed. The further advantage of the methods is that we can use them easily, even if the refractive surface is curved and unknown.These two methods were tested with three experimental models and proved to have a fairly good accuracy.

A Single Camera Method For The 6-Degree Of Freedom Sprung Mass Response Of Vehicles Redirected By Cable Barriers

Abstract: The results in this paper have shown how precise geometrical information can be obtained from photographs taken with a camera that is not specifically designed for photogrammetric purposes. By referring the image coordinates to a system of targets in the field of view of the camera, in relation to which also the center of projection of the camera lens is defined, it has been possible to reconstruct the bundle of projecting rays with a high degree of precision without any information on the interior orientation of the camera. The application during experiments on vehicle redirection by cable barriers has been described. Comparisons with the analysis have been given to show how the accuracy of the measured responses is necessary for validating and diagnosing the comprehensive analysis made possible by today's large scale digital computers. The method seems to offer a suitable solution for measuring the position and parameters in a large number of applications involving moving objects. The simplicity of the instrumentation and the accurate information derivable from the photographic image will undoubtedly appeal to engineers and scientists working on similar projects. /Author/

Geometric aspects in digital analysis of Multi-Spectral Scanner (MSS) data

Abstract: Present automated systems of interpretation which apply pattern recognition techniques on MSS data do not fully consider the geometry of the acquisition system. In an effort to improve the usefulness of the MSS data when digitally treated, geometric aspects are analyzed and discussed. Attempts to correct for scanner instabilities in position and orientation by affine and polynomial transformations, as well as by modified collinearity equations are described. Methods of accounting for panoramic and relief effects are also discussed. It is anticipated that reliable area as well as position determinations can be accomplished during the process of automatic interpretation. A concept for a unified approach to the treatment of remote sensing data, both metric and nonmetric is presented.