THEORY EXAMINATION (SEM–IV) 2016-17 MULTIMEDIA AND ANIMATION

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Course: B.Tech (IT / CSE)
Subject Code: NIT401
Subject Title: Multimedia and Animation
Exam Type: Theory
Duration: 3 Hours
Maximum Marks: 100

SECTION – A (10 × 2 = 20 Marks)

Short, conceptual questions focusing on the fundamentals of multimedia systems .

No.	Question	Concept Summary
(a)	Characteristics of Multimedia System	Integrates multiple media (text, audio, image, video, animation); requires synchronization, user interactivity, and digital representation.
(b)	Digital vs Analog Signals	A digital signal is sampled and quantized; a degraded approximation of the analog original due to sampling and quantization noise.
(c)	Aliasing in Sampling	If sampling frequency = 1.5 × true frequency → alias frequency =
(d)	Applications of Graphics	CAD, gaming, data visualization, advertising, simulations, medical imaging, virtual reality.
(e)	Tweened Animation	Intermediate frames automatically generated between keyframes — saves manual effort and creates smooth motion.
(f)	Need for Compression	Reduces file size, transmission time, and storage needs for large multimedia files (e.g., audio/video).
(g)	Bitmap vs Vector Graphics	Bitmap = pixel-based (e.g., JPEG, PNG); Vector = mathematical lines/curves (e.g., SVG, AI) — scalable without quality loss.
(h)	Principles of Animation	Timing, spacing, squash & stretch, anticipation, follow-through, exaggeration, and appeal.
(i)	Characteristics of Sound	Pitch, loudness, timbre, duration, intensity — define auditory perception.
(j)	Cell vs Path Animation	Cell: frame-by-frame drawing; Path: moves objects along defined paths (e.g., motion tween).

SECTION – B (5 × 10 = 50 Marks)

Analytical and descriptive questions involving tools, compression, and processes .

(a) Multimedia Compression Formats

Audio: MP3 (lossy), WAV (lossless), AAC, WMA.

Video: MPEG, H.264, AVI, MOV.

Image: JPEG (lossy), PNG (lossless), GIF (indexed color).
Compression uses redundancy removal — spatial, temporal, or statistical.

(b) Creating a Movie Clip Symbol

Select object → choose Insert → New Symbol.

Type name and select “Movie Clip.”

Create timeline animation.

Access clip from Library for reuse in project.

(c) OCR – Pattern Matching vs Feature Extraction

Aspect	Pattern Matching	Feature Extraction
Basis	Compares complete pixel pattern	Uses structural attributes (lines, loops)
Accuracy	High for fixed fonts	Better for variable fonts
Technique	Template-based	Analytical (shape & geometry based)

(d) GIF Compression (LZW Algorithm)

Uses Lempel-Ziv-Welch (LZW) lossless compression.

Works by replacing repetitive sequences with shorter codes.

Limited to 256 colors → suitable for logos, icons, simple animation.

(e) Phases of Multimedia Application Development

Planning: Define purpose and audience.

Design: Storyboard, layout, and navigation flow.

Development: Integrate text, images, video, audio, animation.

Testing: Check usability, performance, compatibility.

Delivery: Publish via web, CD, or mobile platform.

(f) Raster Scanning and Interlacing

Raster Scan: Electron beam sweeps line-by-line across display; forms image frame.

Interlacing: Displays alternate lines per frame (odd/even fields) — reduces flicker on low-refresh monitors.

(g) 2D Animation Tools

Adobe Animate (Flash): Keyframe & tween-based animation.

Synfig Studio: Open-source vector-based animation.

Toon Boom Harmony: Advanced 2D/3D hybrid animation tool.

(h) Classic Tween Motion

Create starting & ending keyframes.

Right-click → Create Classic Tween.

Apply motion path to move object smoothly.

Adjust easing for natural acceleration/deceleration.

SECTION – C (2 × 15 = 30 Marks)

Detailed analytical and conceptual application questions .

Q3. (i) Media Components in Multimedia

Media	Example	Function
Text	Captions, titles	Clarifies meaning, easy navigation
Image	JPEG, PNG	Visual enhancement
Audio	Narration, background music	Emotional impact
Video	Tutorials, clips	Realistic visualization
Animation	Motion graphics	Dynamic storytelling
Integration Example: Educational CD combining diagrams (image), narration (audio), and interactive quizzes (text/animation).

(ii) DCT vs DFT

Parameter	DCT	DFT
Coefficients	Real	Complex
Computation	Faster, efficient for compression	Slower
Application	JPEG, MPEG	Signal analysis
→ DCT (Discrete Cosine Transform) is more efficient for image/video compression due to real, energy-compacted coefficients.

Q4. Rotation Matrix (3D Transformation)

For rotation of a point P(x,y,z)P(x, y, z)P(x,y,z) about an arbitrary line:

[T]=T1⋅Rx(θ)⋅Ry(θ)⋅Rz(θ)⋅T2[T] = T_1 \cdot R_x(\theta) \cdot R_y(\theta) \cdot R_z(\theta) \cdot T_2[T]=T1⋅Rx(θ)⋅Ry(θ)⋅Rz(θ)⋅T2

Combines translation and rotation matrices.
Used in 3D modeling, robotics, and animation movement control.

Q5. Motion Cycling in Animation

Concept: Repetition of short motion sequences to simulate continuous movement (e.g., running, walking).

Advantage: Reduces frame count → smaller file size (compact animation).

Technique: Looping keyframes, adjusting timing, blending transitions.

Summary

This Multimedia and Animation (NIT401) exam comprehensively tests:

Core Area	Concepts Covered
Multimedia Fundamentals	Components, compression, synchronization
Digital Graphics	Bitmap vs vector, raster scan, aliasing
Animation Principles	Tweening, motion paths, motion cycling
2D/3D Transformation	Rotation matrix, DCT, interlacing
Multimedia Development	Workflow, phases, file formats