PPT-Contour drawing / Edge detection

Outline Contour drawing in art S il h o uette outline Definition of outlines Image space Object space Image space methods Edge detection First order methods Second order methods Edge. Alex Wade. CAP6938 Final Project. Introduction. GPU based implementation of . A Computational Approach to Edge Detection. by John Canny. Paper presents an accurate, localized edge detection method. Purpose. CSE . 576. Ali Farhadi. Many slides from Steve Seitz and Larry . Zitnick. Edge. Attneave's. Cat (1954) . Edges are caused by a variety of factors. depth discontinuity. surface color discontinuity. illumination discontinuity. Winter in . Kraków. photographed by . Marcin. . Ryczek. Edge detection. Goal: . Identify sudden changes (discontinuities) in an image. Intuitively, most semantic and shape information from the image can be encoded in the edges. A line that creates boundaries that separates one area from another. They define the edges and surface ridges of objects and figures.. . Contour line drawings are like coloring book pages. No Value (light and dark shadows and highlights). Computer Vision Lecture 10: Contour Fitting. 1. Edge Relaxation. Typically, this technique works on . crack edges. :. pixel. pixel. a ridge. a valley. g. oing uphill. closer . contours. = steeper slope. contours farther apart = shallower slope. Imagine that the red line represents a geologic contact of some sort. Given that it doesn’t parallel contours we know it isn’t horizontal, and given that it doesn’t cut straight across contours we know it isn’t vertical. Can we tell something about its orientation? . with character.. Expressionistic Drawing. Erich . Heckel. Figurative Representation. Egon. . Schiele. Aggressively. Deliberately. Fearlessly. Because of the aforementioned qualities, their figures are . 1st step in learning how to draw. Vocabulary. Composition. - the organization or arrangement of the art elements in a pictorial space.. Contour. - a line that delineates or represents both the outside edges of an object and the edges of planes.. Similar to Postal and Hitchman (1999). w. = 2556 km . p . =12,823 km . A. rea. . = 8,569,380 km. 2. . Similar but more inclusive than Wernli and Sprenger (2007). Subtropical PV Streamer Variability and Impact in the Subtropical North Atlantic Basin. Contour lines are lines drawn on a map that connect points of equal elevation. If you walk along a contour line you neither gain or lose elevation.  . Picture walking along a beach exactly where the water. Authors:. Farnaz Shariat , . Riadh Ksantini, . Boubakeur . Boufama. shariatf@uwindsor.ca. ksantini@uwindsor.ca. boufama@uwindsor.ca. University of Windsor. May 2009. 2. Presentation Outline . Introduction . Let’s make a topographic profile from A to C, passing through the top of the bank at B. It will help us see how steep the East Flower Garden Bank is along that line. To make a topographic profile you will need:. a ridge. a valley. g. oing uphill. closer . contours. = steeper slope. contours farther apart = shallower slope. Imagine that the red line represents a geologic contact of some sort. Given that it doesn’t parallel contours we know it isn’t horizontal, and given that it doesn’t cut straight across contours we know it isn’t vertical. Can we tell something about its orientation? . What is Edge Detection?. Identifying points/Edges . in a digital image at which the image brightness changes sharply . or . has . discontinuities. . - Edges are significant local changes of intensity in an image..