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

Problems at shared vertices - modeling and rendering, Problems at Shared Ve...

Problems at Shared Vertices - Modeling and Rendering Shading discontinuities can arise while two adjacent polygons fail to share a vertex which lies along their common edge.

Compute the height of the resized image, Question) Compute the following: ...

Question) Compute the following:  a) Size of 420 × 300 image at 240 pixels per inch.  b) Resolution (per square inch) of  3 ×  2 inch image that has  768×512 pixels.  c) H

Dv encoder types, DV Encoder Types: While DV is captured in a computer thi...

DV Encoder Types: While DV is captured in a computer this is stored in an AVI file, that is Microsoft's standard file format used for video files. Video support in Windows is prov

Computer aided design and computer aided manufacturing, The development of ...

The development of CAD had little consequence on CNC initially because of the various abilities and file formats used through drawing and machining programs. Conversely, as Compute

Define emissive and non-emissive displays, What do you mean by emissive and...

What do you mean by emissive and non-emissive displays?  The emissive display changes electrical energy into light energy. The plasma panels, thin film electro-luminescent disp

Behavioral animation - computer animation, Behavioral Animation - Computer ...

Behavioral Animation - Computer Animation It used for control the motion of several objects automatically. Objects or "actors" are specified rules about how they respond to th

Time delay and busy flag method, 1. Using a time Delay Method The delay...

1. Using a time Delay Method The delay required between issuing each character to the LCD is about 5-10ms (it's simply known as DELAY). When programming an LCD, a long delay is

Classification of animation process – cad and cam, Consequently some method...

Consequently some methods are utilized to handle this huge information and these methods are termed as animation process that are classified as: First Method: In this method,

Write a c code for generating concentric circles, Write a C code for genera...

Write a C code for generating concentric circles.  Put the circle function circleMidpoint()in a for loop  as follows: for( int radius = MinRadius; radius circleMidpoint(i

Line generation, write digital differntial analyzers(DDA) Algorithm

write digital differntial analyzers(DDA) Algorithm

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