Scan conversion in computer graphics

COSC 435 Computer Graphics Spring 20021 Scan-Conversion 2 Scan-Conversion • figuring out what pixels have to be colored in order to draw a geometric primitive on the screen – lines – circles/ellipses – polygons – text 3D model 2D image on screen clipping camera placement rasterization modeling transformation viewing transformation

Been used to scan convert a number of CSG models, producing distance volumes which have been utilized in a variety of computer graphics applications, e.G. CSG surface evaluation, offset surface generation, and 3-Dmodel morphing. 1 Introduction Volume graphics is a … Computer Graphics Circle Drawing Week 6, Lecture 10 David Breen, William Regli and Maxim Peysakhov Department of Computer Science Drexel University 2 Outline • Scan conversion of circles • Clipping circles • Scan conversion of ellipses 3 Scan Conversion of Circles Generalization of the line algorithm • Assumptions: – circle at (0 Authoring and acceleration of parallel computing, graphics, dy namic media, computer vision and sensor processing on a wide variety of platforms and devices. ] Introduction to OpenGL... Scan-conversion … COMPUTER GRAPHICS UNIT-I: GRAPHICS PRIMITIVES AND SCAN CONVERSION Computer Graphics: An ability of drawing pictures, lines, charts, etc by means of computers through programming is defined as computer graphics. It converts data to and/or from visual arrangement using computers. It uses a computer to create pictures. Introduction to Computer Graphics Course Notes Main Page Accreditation: This version of these course notes was assembled Spring 2005 by John Bell, for CS 488 at the University of Illinois Chicago.; Much of the material in these course notes was provided by Andy Johnson, from his CS 488 course web pages. What is computer graphics? Answer- The term computer graphics include almost every thing on computer that is not text or sound. It is an art of drawing pictures, lines. Charts, etc. Using computers with the help of programming... Recent electrostatic plotters includes a scan conversion capability. 3. Color electrostatic plotters are available Scan Converting Lines, Circles And Ellipses (Contd) PDF unavailable: 16: Scan Converting Lines, Circles And Ellipses (Contd) PDF unavailable: 17: Scan Converting Lines, Circles And Ellipses (Contd) PDF unavailable: 18: Polyfill- Scan Conversion Of A Polygon: PDF unavailable: 19: Scan Conversion Of A Polygon (Contd) PDF unavailable: 20: Clipping Piicatiom of the algorithms to computer graphics include scan conversion ofparametricsurfaces,pararnetridlmplicit representationconversion, aelee-tion of [email protected] parameters for parsmeteriz.Ed shapes, and computa-tion of tolerance geometric queries such as point enclosure. Ray Tracing Rsy tracing a parametric surface, S(u, V} R 2 + R’, in- Abstract. The concept of SCAN CONVERSION is important in raster graphics since any shape which is to be drawn into the frame buffer must first be decomposed into pixels lying in a regular raster grid pattern. A mathematical point (x, y) where x and y are real numbers within an image area, needs to be scan converted to a pixel at location (x’, y’). This may be done by making x’ to be the integer part of x, and y’ to be the integer part of y. In other words, x’ = floor(x) and y’ = floor(y)