Page 17 - DCAP504_Computer Graphics

Computer Graphics

3. Select the suitable choice for every question:
(a) One of the important elements of computer science which is covered by computer graphics is
(i) Interaction with images (ii) Image transition
(iii) Image storage (iv) Image buffer

(b) A 6×41/2 inch image and a 1024×768 inch image have an aspect ratio of
(i) 3/4 (ii) 4/3
(iii) 1/1 (iv) 2/3
(c) Classically, the pixel at the lower left corner of the image is considered to be at the origin
(i) (1, 0) (ii) (0, 1)
(iii) (0, 0) (iv) (1, 1)
1.9 Review Questions

1. “One of the main issues in using contour image representations is how to save such
representations in a compact manner”. Explain.
2. “A typical image file mainly consists of header and image data”. Describe.

3. “The image data’s values may be compressed with the help of a compression algorithm”. Which
algorithm?
4. “During the last four to five decades, various techniques have been developed in image
processing”. Explain.
5. “Analog image processing refers to the modification of image with the help of electrical means”.
Explain with an example.
6. “Curves or points with vectors that connect these points are used to represent every graphical
object or image”. Explain under which image representation this is observed.
7. “The most notable special aspect of direct coding is the black, white and gray scale image
representations”. Explain.
8. “The representation of image with the help of a lookup table can be viewed as a negotiation
between the necessity to have a lower storage necessity and the requirement to support a
reasonably sufficient number of simultaneous colors”. Discuss.
Answers: Self Assessment

1. (a) True (b) False (c) False (d) True (e) True
2. (a) Fixed (b) Enhancing (c) GUIs
(d) Co-ordinates (e) Graphics
3. (a) Interaction with images (b) 4/3 (c) (0, 0)
1.10 Further Readings

Shirley P, Marschner S., Fundamentals of Computer Graphics. Library of Congress
Catalogue-in-Publication Data.

http://diwww.epfl.ch/lami/detec/perrigproj96/node10.html

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