Course: B.Tech (IT / CSE)Subject Code: NIT401Subject Title: Multimedia and Animation Exam Type: TheoryDuration: 3 HoursMaximum 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).
(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.
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
