# Question: What Do You Mean By Scan Conversion?

## What is 8 way symmetry of a circle?

Circle is an eight-way symmetric figure.

The shape of circle is the same in all quadrants.

In each quadrant, there are two octants.

If the calculation of the point of one octant is done, then the other seven points can be calculated easily by using the concept of eight-way symmetry..

## Why we use Bresenham’s algorithm?

This algorithm is used for scan converting a line. It was developed by Bresenham. It is an efficient method because it involves only integer addition, subtractions, and multiplication operations. These operations can be performed very rapidly so lines can be generated quickly.

## How do you draw a circle algorithm?

Bresenham’s Circle Algorithm:Step1: Start Algorithm.Step2: Declare p, q, x, y, r, d variables. … Step3: Enter the value of r.Step4: Calculate d = 3 – 2r.Step5: Initialize x=0. … Step6: Check if the whole circle is scan converted. … Step7: Plot eight points by using concepts of eight-way symmetry. … Step8: Find location of next pixels to be scanned.More items…

## What are four major adverse effects of scan conversion?

Side effects due to scan conversion, Computer GraphicsStaircase A common example of aliasing effects is the staircase of jagged appearance, we see when scan converting a primitive such as a line of a circle. … Unequal Brightness Another side effect that is less noticeable is the unequal brightness of lines of different orientation.More items…

## What is the basis of scan conversion of a circle?

In the process of “scan –converting a circle”, the circle is divided into eight equal parts, one part is called as octant, and if one part is generated, then it is easy to replicate the other seven parts; so computing one octant is enough to determine the complete circle.

## What methods are adopted to remove the side effects of scan conversion?

Computer Graphics | AntialiasingUsing high-resolution display: One way to reduce aliasing effect and increase sampling rate is to simply display objects at a higher resolution. … Post filtering (Supersampling): … Pre-filtering (Area Sampling): … Pixel phasing:

## Which display device allows us to walk around an object and view it from different sides?

10. Which display devices allows us to walk around an object and view it from different sides. Explanation: 3D display devices allows user to view the object from different sides.

## Which approaches are used for determine whether a particular point is inside or outside of a polygon?

One simple way of finding whether the point is inside or outside a simple polygon is to test how many times a ray, starting from the point and going in any fixed direction, intersects the edges of the polygon. If the point is on the outside of the polygon the ray will intersect its edge an even number of times.

## Why midpoint circle algorithm is so called?

This is an algorithm which is used to calculate the entire perimeter points of a circle in a first octant so that the points of the other octant can be taken easily as they are mirror points; this is due to circle property as it is symmetric about its center.

## Why do we need scan conversion?

Advantage of developing algorithms for scan conversion Algorithms can generate graphics objects at a faster rate. Using algorithms memory can be used efficiently. Algorithms can develop a higher level of graphical objects.

## What does a scan converter do?

A scan converter is a device that converts a computer-video signal into a signal that is compatible with a television. Sometimes a scan converter is referred to as a “PC to TV” converter or a “PC to video” converter because it allows you to view computer-video on a TV set.

## What will happen if PK 0?

i.e., Pk<0, means that midpoint is inside the circle boundary, so the circle boundary is close to the upper pixel, thus choose the upper pixel (xk+1, yk) for plotting, otherwise if Pk>0, the midpoint is outside the circle boundary, so the circle boundary is close to the lower pixel, thus choose the lower pixel (xk+1, …

## What is random scan display?

In Random-Scan Display electron beam is directed only to the ares of screen where a picture has to be drawn. It is also called vector displays, as it draws picture one line at time. It can draw and refresh component lines of a picture in any specified sequence. Pen plotter is an example of random-scan displays.