CS602 Important Topics | CS602 Short Notes

 CS602 important Short Questions by VU BWN

CS602 Short Question

 

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Question: What is gamma? Answer: The intensity of light generated by a physical device is not usually a linear function of the applied signal. A conventional CRT has a power-law response to voltage: intensity produced at the face of the display is approximately the applied voltage, raised to the 2.5 power. The numerical value of the exponent of this power function is colloquially known as gamma. This nonlinearity must be compensated in order to achieve correct reproduction of intensity.

Question: What is contrast ratio? Answer: Contrast ratio is the ratio of intensity between the brightest white and the darkest black of a particular device or a particular environment. Projected cinema film - or a photographic reflection print - has a contrast ratio of about 80:1. Television assumes a contrast ratio - in your living room - of about 30:1. Typical office viewing conditions restrict contrast ratio of CRT display to about 5:1.

Question: What is motion capture? Answer: Motion capture is a technique by which a performer's movements can be recorded digitally, and reproduced by a CG character either in real-time or after the data has been processed (depending on how the data is sampled). This allows for more realistic and natural motion in character animation. A variation of this technique uses an armature instead of a performer, and movements are made and keyframed the same way that stop-motion animators have been doing it for many years.

Question: How do I do a hidden surface test (backface culling) with 2D points? Answer: c = (x1-x2)*(y3-y2)-(y1-y2)*(x3-x2) x1,y1, x2,y2, x3,y3 = the first three points of the polygon. If c is positive the polygon is visible. If c is negative the polygon is invisible (or the other way).

Question: What are the Applications for Computer Graphics? Answer: Computer graphics applications are found in almost all areas. Some of the important areas are: User Interfaces Layout and Design Scientific Visualization and Analysis Art Design Medicine and Virtual Surgery Layout Design Architectural Simulations History and cultural heritage Entertainment Simulations Games

Question: How do I rotate a 2D point? Answer: In 2D, you make (X,Y) from (x,y) with a rotation by angle t so: X = x cos t - y sin t Y = x sin t + y cos t As a 2x2 matrix this is very simple. If you want to rotate a column vector v by t degrees using matrix M, use M = [cos t -sin t] [sin t cos t] in the product M v. If you have a row vector, use the transpose of M (turn rows into columns and vice versa). If you want to combine rotations, in 2D you can just add their angles, but in higher dimensions you must multiply their matrices.

Question: What is meant by Computer Graphics? Answer: Computer Graphics involves technology to accept, process, transform and present information in a visual form that also concerns with producing images (or animations) using a computer.

Question: what are Computer Graphics Applications? Answer: Computer graphics applications are found in almost all areas. Some of the important areas are: User Interfaces Layout and Design Scientific Visualization and Analysis Art and Design Medicine and Virtual Surgery Layout Design & Architectural Simulations History and cultural heritage Entertainment Simulations Games

Question: What is the difference between pixel and resolution? Answer: A pixel is the smallest unit in a computer image or display. Resolution is mapping between the monitor screen size and the pixels.With higher resolution, more pixels can be displayed and therefore the image is more discrete and detailed, however, pixels are smaller at high resolution and detail can be hard to visualize on smaller screens.

 

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