multimedia input / output technologies full motion video 10/29/2015 1 a.aruna, assistant professor,...
TRANSCRIPT
MULTIMEDIA INPUT / OUTPUT TECHNOLOGIES
FULL MOTION VIDEO
04/20/23
1
A.Aruna, Assistant Professor, Faculty of Information Technology
INTRODUCTION
•Most Important and Complex and allow video image processing
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
2
VIDEO CAMERAS
•Used for business multimedia Application – in terms of Image Capture and Processing
•Commercial video cameras and hobby cameras
•TV Viewer, Monitors•CCD
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
3
FULL MOTION VIDEO CONTROLLERS•Complex component – Analyse the
requirements•Full Motion Video Controller
Requirements▫Video controller for Play back▫Start at Capture Stage – Where the video to
be Recorded▫Professional or Unprofessional Setting –
Capture based on interest▫Signal Quality
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
4
VIDEO BOARD ARCHITECTURE
•Similar to video frame grabber board – circuit card in a computer
•Components▫ Video INPUT – accept the input Signal(NTSC/PAL/SECAM
broadcast Signal, Video Camera or VCR▫ S- Video – accept RS170 input▫ Video Compression and Decompression Processor▫ Audio Compression and Decompression Processor▫ A/D Converter and vice versa▫ Audio INPUT for Stereo Audio LINE IN,CD IN (CD Audio
Input)▫ Microphone
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
5
VIDEO BOARD ARCHITECTURE
•Handle variety of audio and video input signal and convert from analog to digital and Vice versa
•Also required for video playback boards•Rendering support for various television
signal formats - NTSC for North America, PAL For Europe & Asia, SECAM for France and Middle East and So on - Level of Complexity of design the video boards
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
6
VIDEO BOARD ARCHITECTURE•Video Channel Multiplexer – multiple input
for different video input•Video Compression and Decompression
▫ Compress and decompress the video data▫ Mpeg 2 standard for real time full motion video▫ Motion jpeg, ITT H.261 for Video Conferencing▫ Provide algorithm support multiple standards for single
board▫ On board programmable engine – video playback▫ Not only flexible to modify the algorithm by developing new
microcode if the standards changes▫ Dynamically change the compression and decompression
standards on file formats
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
7
VIDEO BOARD ARCHITECTURE▫ User to pick and choose the particular algorithm before
capture and playback▫ Flexibility to play or create a file format with a
particular algorithm▫ Different stage for compression and decompression
processor DCT Inverse DCT Quantization Inverse Quantization Zig Zag and Zero Runlength Encoding and Decoding Motion Estimation and Compension
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
8
VIDEO BOARD ARCHITECTURE•Audio Compression
▫MPEG 2 standard for audio Compression and Decompression
▫Needs programmable engine on a board▫Microcode for the new Algorithm – without
developing the card▫Adaptive pulse code modulation for sample the audio
signal▫Takes the difference between actual sample value
and predicted sample values▫Difference is then encoded by 4 bit or 8 bit value
based on sampling rate
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
9
VIDEO BOARD ARCHITECTURE• A / D Converter
▫ Inputs from video switch and convert the amplitude of a sampled analog signal to either 8bit or 16 bit value
▫ 4 Important Process Sampling Rate Resolution Linearity Conversion Speed
04/20/23A.Aruna, Assistant Professor, Faculty of
Information Technology
10
04/20/23A.Aruna, Assistant Professor, Faculty of Information Technology
11
Video Compression and Decompression
D/A Converter
Multi Channel Video switch and A/D
Converter
Video Frame Memory
Audio Input Switch
ISA
Bus
for
PC
Audio LINE OUTRS 422 FOR VCR CAMERA
Audio Compression and Decompression
NTSCPALSECAMS VIDEO
MicrophoneStereoLine inCD Audio in