COMPUTER GRAPHICS- 2 MARK QUESTIONS WITH ANSWERS

1. What is scaling?

A 2-D rotation is done by repositioning the coordinates along a circular path, in the x-y plane by making an angle with the axes. The transformation is given by:

X’ = r cos (q + f) and Y|’= r sin (q + f).

2. What is shearing?

The shearing transformation actually slants the object along the X direction or the Y direction as required. ie; this transformation slants the shape of an object along a required plane.

3. What is reflection?

The reflection is actually the transformation that produces a mirror image of an object. For this use some angles and lines of reflection.

4. Distinguish between window port & view port?

A portion of a picture that is to be displayed by a window is known as window port. The display area of the part selected or the form in which the selected part is viewed is known as view port.

5. Define clipping?

Clipping is the method of cutting a graphics display to neatly fit a predefined graphics region or the view port

6. What is the need of homogeneous coordinates?

To perform more than one transformation at a time, use homogeneous coordinates or matrixes. They reduce unwanted calculations intermediate steps saves time and memory and produce a sequence of transformations.

COMPUTER GRAPHICS- 2 MARK QUESTIONS WITH ANSWERS

1. Define Computer graphics.

Computer graphics remains one of the most existing and rapidly growing computer fields. Computer graphics may be defined as a pictorial representation or graphical representation of objects in a computer.

2. Name any four input devices.

Four input devices are keyboard, mouse, image scanners, and trackball.

3. What is resolution?

The maximum number of points that can be displayed without overlap on a CRT is referred to as the resolution.

4. Write the types of clipping?

Point clipping, line clipping, area clipping, text clipping and curve clipping.

5. Define pixel?

Pixel is shortened forms of picture element. Each screen point is referred to as pixel or pel.

6. What is frame buffer?

Picture definition is stored in a memory area called frame buffer or refresh buffer.

7. What is point in the computer graphics system?

The point is a most basic graphical element & is completely defined by a pair of user coordinates (x, y).