Module 1: Scan Conversion

The key points from this module are:
The mapping process from the viewport description to a pixel grid is known as Scan Conversion or Rendering.

The Digital Differential Analyzer is an incremental approach to speed up the scan conversion process.

In Bresenham’s Algorithm, if the difference between dupper and dlower is less than 0, then the lower pixel is chosen, else the upper pixel is chosen.

There are two ways to define a region, which are:
Pixel Level Definition
Geometric Definition

A region that is defined in terms of boundary pixels is called boundary defined and a region that is defined in terms of pixels without a boundary is known as interior defined.

Scan-Line Polygon Fill Algorithm depends on the geometric definition of an object.

Font or typeface denotes the overall design style of character.

There are broadly two ways of rendering characters, which are:
Bitmapping
Outlining

Anti-Aliasing Techniques are used to smoothen the scan converted or rendered shapes.

The two filtering techniques in Aliasing and Signal Processing are:
Pre-Filtering
Post-Filtering