MCS-53 Computer Graphics and Multimedia – 2008

  JHARKHAND BOARD You are here
Q 1(a).

Digitize a line from point (-1, -1) to point (4, 5) using Brcsenham's Line Generation Algorithm.

Q.1 (b).

Find out (using Bresenham algorithm) the pixel location approximating the first octant of a circle having center at (0, 0) and radius 5.

Q. 1(c). Compare and contrast the following:

(i) Cyrus Beck and Cohen Suther land and Line clipping algorithms.

(ii) Random and Raster Scan display devices.

Q.1 (d). With the help of suitable diagram and related tables describe how frame buffer can be used to control the color and intensity of the picture display?

Q 2(a).

S a y A B C is a triangle with coordinates A (-2, 0), B (-l, l), C (- l, - l).

Find the transformed coordinates when the triangle ABC is subjected to the anticlockwise rotation of 45° about an axis passing through the centroid of the triangle such that it is parallel to y-axis?

Q. 2(c).

A polygon has 4 vertices located at A (10, 10) B (10, 40), C (40, 10), D (40, 40). Indicate a transformation matrix to have its reflection about X-axis?

Q. 2(d).

Obtain the Perspective projection on the X=Z plane, with center of projection being at (-1, 0, 0), also find principal vanishing point?

Q. 2(e).

Compare and contrast the perspective projection with the parallel projection? Justify your answer that parallel projections preserves lateral measurements?

Q. 3(a).

Find equation of Bezier curve which passes through points (0, 0) and (-2, 1) and is controlled through points (7, 5) and (2, 0)

Q. 3(b).

A Bezier curve is to be drawn given the control points PI (40,40), P2 (10,40), P3 (60,60), P4 (60, 0). Calculate the coordinates of the points on the curve corresponding to the parameter t = 0.2, 0.4, 0.6. Draw a rough sketch of the curve and show coordinates of various points on it?

Q. 3(c)

Briefly discuss the concept of following:

• Hidden surface removal algorithms

• Phong shading

Q. 3(d).

What do you mean by Specular reflection? Is their any relation of surface texture with the type of reflection produced on the exposure of that surface to some light source? Explain with the help of diagram and suitable mathematical equations.

Q 4(a).

Differentiate between following:-

• Morphing and Planning

• Motion Specific animation and Motion Generalized animation

Q 4(b).

How many key frames are required to produce an animation film Sequence with duplications, having duration of five minutes?

Q. 4(c).

What do you mean by terms Cel animation and Sprite animation? Suggest which technique of animation is better and Why?

Q. 4(d).

How do you simulate deceleration in animation scenes? Why the animation seems to be decelerating if the spacing between frames keep on decreasing? Graphically discuss the mathematical function used to produce deceleration in any animation?

Q. 4(e). Briefly describe following file formats:

(i) MPEG (Video format)

(ii) MP3

(iii) GIF (Graphic Interchange Format)

(iv) JPEG (Joint Photographic Experts Group)

Free Solutions: