Scan line algorithm and seed fill algorithm, Computer Graphics

Assignment Help:

Scan line algorithm and seed fill algorithm

Two basic approaches are followed in area filling on raster systems.  In the first approach overlap intervals for scan lines that cross the area are determined per scan line.  Remember that a scan line is a horizontal line of pixels that can be plotted on the display device when the electron beam traverses the display area horizontally during one horizontal retrace. Second approach begins with an interior point and fills the area moving outward from this point until the boundary condition is reached.  An algorithm following the first approach is classified as scan line algorithm and that falling under second class is called seed fill algorithm.  Simple objects such as polygons, circles etc. are efficiently filled with scan line fill algorithms and more complex regions use the seed fill method. The scan line algorithm is mostly used in general graphics packages.

1326_scan line algorithm and seed fill algorithm.png

Let us begin with scan line polygon fill algorithm.  Notice that polygons can be as simple as a triangle and could be as complicated as the one shown in Figure below.

2399_scan line algorithm and seed fill algorithm 1.png

These are self intersecting polygons.  We broadly keep the polygons in one of the three categories (i) convex (ii) concave (iii) self intersecting.  Mathematically, a self intersecting polygon is concave.  You will deal with such polygons in greater details for the purpose of area filling.


Related Discussions:- Scan line algorithm and seed fill algorithm

Construction of a solid with a translational sweep, Construction of a Solid...

Construction of a Solid with a Translational Sweep Figure demonstrates construction of a solid along with a translational sweep. Translating the control points of the periodic

How is sampling done, Image Processing 1. How is sampling done? Explain...

Image Processing 1. How is sampling done? Explain quantization in digital image processing? 2. Explain in brief: (1) Image Subtraction (ii) Image averaging. 3. Explain in

Understanding the concept of hypertext and hypermedia, Understanding the Co...

Understanding the Concept of hypertext and hypermedia: For know the principle of Hypertext and Hypermedia we will look at how the human memory works.

Utility purpose of display processor in the graphic system, Explain the uti...

Explain the utility and purpose of display processor in the graphic system.  The purpose of the display processor is to free the CPU from the graphics chores. A major task of the d

Dda, what is dda

what is dda

What are the advantages of laser printer, What are the advantages of laser ...

What are the advantages of laser printer  High speed, precision and economy. Quality printers. .Cheap to handle Lasts for longer time.

Multimedia resources, Education courses, skills, and knowledge are sometime...

Education courses, skills, and knowledge are sometimes taught of context because of lack of application of real time examples. To resolve this, educators are using multimedia to br

Cohen sutherland algorithm - 2d clipping algorithms, Cohen Sutherland algor...

Cohen Sutherland algorithm Point clipping is very simple.  All you need to check is whether a point is inside the window extremes in x- and y-directions.  For line clipping sev

Region filling, what is region filling? give details

what is region filling? give details

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd