BT9301, Computer Graphics

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ASSIGNMENT

PROGRAM	BSc IT
SEMESTER	SIXTH
SUBJECT CODE & NAME	BT9301, Computer Graphics
CREDITS	4
BK ID	B0810
MARKS	60

Note: Answer all questions. Kindly note that answers for 10 marks questions should be approximately of 400 words. Each question is followed by evaluation scheme.

Question.1. Explain image processing through picture analysis. List the uses of interactive graphics.

Answer:In electrical engineering and computer science, image processing is any form of signal processing for which the input is an image, such as photographs or frames of video; the output of image processing can be either an image or a set of characteristics or parameters related to the image. Most image-processing techniques

Question.2. Write and explain midpoint circle drawing algorithm.

Answer:In computer graphics, the midpoint circle algorithm is an algorithm used to determine the points needed for rasterizing a circle. Bresenham's circle algorithm is derived from the midpoint circle algorithm. The algorithm can be generalized to conic sections.

Rasterisation of a circle by the Bresenham algorithm

The algorithm is related to work by Pitteway and Van Aken.

This algorithm

Question.3. Define polygon filling. Explain flood fill algorithm for polygon filling.

Answer: Polygon is an ordered list of vertices as shown in the following figure. For filling polygons with particular colors, you need to determine the pixels falling on the border of the polygon and those which fall inside the polygon. In this chapter, we will see how we can fill polygons using different techniques.

Scan Line Algorithm: This algorithm

Question.4. Write Liang Barkey’s line clipping algorithm. Write advantages of it.

Answer:The Liang–Barsky algorithm uses the parametric equation of a line and inequalities describing the range of the clipping box to determine the intersections between the line and the clipping box. With these intersections it knows which portion of the line should be drawn. This algorithm is significantly more efficient

Question.5. Define shear. Explain X shear and Y shear.

Answer:Shearing forces are unaligned forces pushing one part of a body in one direction, and another part of the body in the opposite direction. When the forces are aligned into each other, they are called compression forces. An example is a deck of cards being pushed one way on the top, and the other at the bottom, causing the cards to slide. Another example is when wind blows at the side of a peaked roof of a home -

Question.6. Explain the various types of parallel projections.

Answer:Parallel projections have lines of projection that are parallel both in reality and in the projection plane.

Parallel projection corresponds to a perspective projection with an infinite focal length (the distance from the image plane to the projection point), or "zoom".

Within parallel projection there is an ancillary category known as "pictorials". Pictorials show an image of an object as viewed from a skew direction in order to reveal all three directions (axes) of space in one picture. Because pictorial projections innately contain this distortion, in the rote, drawing instrument for pictorials, some liberties may be taken for economy of effort and best effect.

There are two different types of parallel projections:

If the direction of projection

Look at orthographic projection: it is simple, just discard the z coordinates. Engineering drawings frequently use front, side, top orthographic views of an object.

Here are three orthographic views of an object.

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