Detecting surface irregularities using isophotes
نویسنده
چکیده
This contribution refers to the use of lines of equal light intensity, called isophotes, for detecting irregularities of free form surfaces in car body construction. The isophotes show irregularities of surface smoothness, of the Gaussian curvature and of the distribution of the surface normals. The algorithm described was realized in the CADCAM-system Ogsurf-P, a Volkswagen development for car body design and manufacturing.
منابع مشابه
On Geometric Continuity of Isophotes
It is a well known fact that we can deduce G continuous isophotes from a G continuous surface This paper gives answer to the reverse problem we deduce a G continuous surface from G continu ous isophotes on the surface We show how many families of isophotes we have to consider and what constraints apply Furthermore we apply the geodesic curvature and the thickness of isophotes as a surface inter...
متن کاملDirect Shape from Isophotes
This article describes a new method of Shape from Shading, Shape from Isophotes. Shape from Isophotes uses the image isophotes for recovering the object surface normals. It is a propagation method. It initially directly recovers a small number of surface normals and then uses them to estimate normals at neighboring points in either adjacent isophotes or within the same isophote. The propagation...
متن کاملAre isophotes and reflection lines the same?
Isophotes and reflection lines are standard tools for surface interrogation. We study the correlations between them. We show that isophotes and reflection lines are different (but not disjunct) classes of surface curves. Furthermore we introduce the concept of reflection circles as a generalization of isophotes and reflection lines. Reflection circles can be considered as the mirror images of a...
متن کاملEvaluation Of Surfaces For Automobile Body Styling
In the process of car body design, various surfaces can be generated,from the given boundary curves. Depending tqon the method qf the surface generation and the qualip qf the boundary curves provided, the resulting surfaces may have global 07” local irregularities in many cases. Thus it would be necessarvfor the designer to evaluate the surface quality and to rnodifi the surface or to use the d...
متن کاملAnti-truncation of Disks in Early-type Barred Galaxies
The disks of spiral galaxies are commonly thought to be truncated: the radial surface brightness profile steepens sharply beyond a certain radius (3–5 inner-disk scale lengths). Here we present the radial brightness profiles of a number of barred S0–Sb galaxies with the opposite behavior: their outer profiles are distinctly shallower in slope than the main disk profile. We term these “anti-trun...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید
ثبت ناماگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید
ورودعنوان ژورنال:
- Computer Aided Geometric Design
دوره 1 شماره
صفحات -
تاریخ انتشار 1984