Multimedia Systems Video I (Basics of Analog and Digital Video)
Total Page:16
File Type:pdf, Size:1020Kb
Load more
Recommended publications
-
Problems on Video Coding
Problems on Video Coding Guan-Ju Peng Graduate Institute of Electronics Engineering, National Taiwan University 1 Problem 1 How to display digital video designed for TV industry on a computer screen with best quality? .. Hint: computer display is 4:3, 1280x1024, 72 Hz, pro- gressive. Supposing the digital TV display is 4:3 640x480, 30Hz, Interlaced. The problem becomes how to convert the video signal from 4:3 640x480, 60Hz, Interlaced to 4:3, 1280x1024, 72 Hz, progressive. First, we convert the video stream from interlaced video to progressive signal by a suitable de-interlacing algorithm. Thus, we introduce the de-interlacing algorithms ¯rst in the following. 1.1 De-Interlacing Generally speaking, there are three kinds of methods to perform de-interlacing. 1.1.1 Field Combination Deinterlacing ² Weaving is done by adding consecutive ¯elds together. This is ¯ne when the image hasn't changed between ¯elds, but any change will result in artifacts known as "combing", when the pixels in one frame do not line up with the pixels in the other, forming a jagged edge. This technique retains full vertical resolution at the expense of half the temporal resolution. ² Blending is done by blending, or averaging consecutive ¯elds to be displayed as one frame. Combing is avoided because both of the images are on top of each other. This instead leaves an artifact known as ghosting. The image loses vertical resolution and 1 temporal resolution. This is often combined with a vertical resize so that the output has no numerical loss in vertical resolution. The problem with this is that there is a quality loss, because the image has been downsized then upsized. -
Comparison of HDTV Formats Using Objective Video Quality Measures
Multimed Tools Appl DOI 10.1007/s11042-009-0441-2 Comparison of HDTV formats using objective video quality measures Emil Dumic & Sonja Grgic & Mislav Grgic # Springer Science+Business Media, LLC 2010 Abstract In this paper we compare some of the objective quality measures with subjective, in several HDTV formats, to be able to grade the quality of the objective measures. Also, comparison of objective and subjective measures between progressive and interlaced video signal will be presented to determine which scanning emission format is better, even if it has different resolution format. Several objective quality measures will be tested, to examine the correlation with the subjective test, using various performance measures. Keywords Video quality . PSNR . VQM . SSIM . TSCES . HDTV. H.264/AVC . RMSE . Correlation 1 Introduction High-Definition Television (HDTV) acceptance in home environments directly depends on two key factors: the availability of adequate HDTV broadcasts to the consumer’s home and the availability of HDTV display devices at mass market costs [6]. Although the United States, Japan and Australia have been broadcasting HDTV for some years, real interest of the general public appeared recently with the severe reduction of HDTV home equipment price. Nowadays many broadcasters in Europe have started to offer HDTV broadcasts as part of Pay-TV bouquets (like BSkyB, Sky Italia, Premiere, Canal Digital ...). Other major public broadcasters in Europe have plans for offering HDTV channels in the near future. The announcement of Blu-Ray Disc and Game consoles with HDTV resolutions has also increased consumer demand for HDTV broadcasting. The availability of different HDTV image formats such as 720p/50, 1080i/25 and 1080p/50 places the question for many users which HDTV format should be used with which compression algorithm, together with the corresponding bit rate. -
Viarte Remastering of SD to HD/UHD & HDR Guide
Page 1/3 Viarte SDR-to-HDR Up-conversion & Digital Remastering of SD/HD to HD/UHD Services 1. Introduction As trends move rapidly towards online content distribution and bigger and brighter progressive UHD/HDR displays, the need for high quality remastering of SD/HD and SDR to HDR up-conversion of valuable SD/HD/UHD assets becomes more relevant than ever. Various technical issues inherited in legacy content hinder the immersive viewing experience one might expect from these new HDR display technologies. In particular, interlaced content need to be properly deinterlaced, and frame rate converted in order to accommodate OTT or Blu-ray re-distribution. Equally important, film grain or various noise conditions need to be addressed, so as to avoid noise being further magnified during edge-enhanced upscaling, and to avoid further perturbing any future SDR to HDR up-conversion. Film grain should no longer be regarded as an aesthetic enhancement, but rather as a costly nuisance, as it not only degrades the viewing experience, especially on brighter HDR displays, but also significantly increases HEVC/H.264 compressed bit-rates, thereby increases online distribution and storage costs. 2. Digital Remastering and SDR to HDR Up-Conversion Process There are several steps required for a high quality SD/HD to HD/UHD remastering project. The very first step may be tape scan. The digital master forms the baseline for all further quality assessment. isovideo's SD/HD to HD/UHD digital remastering services use our proprietary, state-of-the-art award- winning Viarte technology. Viarte's proprietary motion processing technology is the best available. -
BA(Prog)III Yr 14/04/2020 Displays Interlacing and Progressive Scan
BA(prog)III yr 14/04/2020 Displays • Colored phosphors on a cathode ray tube (CRT) screen glow red, green, or blue when they are energized by an electron beam. • The intensity of the beam varies as it moves across the screen, some colors glow brighter than others. • Finely tuned magnets around the picture tube aim the electrons onto the phosphor screen, while the intensity of the beamis varied according to the video signal. This is why you needed to keep speakers (which have strong magnets in them) away from a CRT screen. • A strong external magnetic field can skew the electron beam to one area of the screen and sometimes caused a permanent blotch that cannot be fixed by degaussing—an electronic process that readjusts the magnets that guide the electrons. • If a computer displays a still image or words onto a CRT for a long time without changing, the phosphors will permanently change, and the image or words can become visible, even when the CRT is powered down. Screen savers were invented to prevent this from happening. • Flat screen displays are all-digital, using either liquid crystal display (LCD) or plasma technologies, and have replaced CRTs for computer use. • Some professional video producers and studios prefer CRTs to flat screen displays, claiming colors are brighter and more accurately reproduced. • Full integration of digital video in cameras and on computers eliminates the analog television form of video, from both the multimedia production and the delivery platform. • If your video camera generates a digital output signal, you can record your video direct-to-disk, where it is ready for editing. -
A Review and Comparison on Different Video Deinterlacing
International Journal of Research ISSN NO:2236-6124 A Review and Comparison on Different Video Deinterlacing Methodologies 1Boyapati Bharathidevi,2Kurangi Mary Sujana,3Ashok kumar Balijepalli 1,2,3 Asst.Professor,Universal College of Engg & Technology,Perecherla,Guntur,AP,India-522438 [email protected],[email protected],[email protected] Abstract— Video deinterlacing is a key technique in Interlaced videos are generally preferred in video broadcast digital video processing, particularly with the widespread and transmission systems as they reduce the amount of data to usage of LCD and plasma TVs. Interlacing is a widely used be broadcast. Transmission of interlaced videos was widely technique, for television broadcast and video recording, to popular in various television broadcasting systems such as double the perceived frame rate without increasing the NTSC [2], PAL [3], SECAM. Many broadcasting agencies bandwidth. But it presents annoying visual artifacts, such as made huge profits with interlaced videos. Video acquiring flickering and silhouette "serration," during the playback. systems on many occasions naturally acquire interlaced video Existing state-of-the-art deinterlacing methods either ignore and since this also proved be an efficient way, the popularity the temporal information to provide real-time performance of interlaced videos escalated. but lower visual quality, or estimate the motion for better deinterlacing but with a trade-off of higher computational cost. The question `to interlace or not to interlace' divides the TV and the PC communities. A proper answer requires a common understanding of what is possible nowadays in deinterlacing video signals. This paper outlines the most relevant methods, and provides a relative comparison. -
Video Terminology Video Standards Progressive Vs
VIDEO TERMINOLOGY VIDEO STANDARDS 1. NTSC - 525 Scanlines/frame rate - 30fps North & Central America, Phillipines & Taiwan . NTSC J - Japan has a darker black 2. PAL - 625 scanlines 25 fps Europe, Scandinavia parts of Asia, Pacific & South Africa. PAL in Brazil is 30fps and PAL colours 3. SECAM France Russia Middle East and North Africa PROGRESSIVE VS INTERLACED VIDEO All computer monitors use a progressive scan - each scan line in sequence. Interlacing is only for CRT monitors. LCD monitors work totally differently - no need to worry about. Interlacing is for broadcast TV. Every other line displayed alternatively. FRAME RATES As we transition from analogue video to digitla video. Film is 24 fps, PAL video 25 fps. NTSC 30fps. Actually film and NTSC are slightly different but we don't need to worry about that for now. IMAGE SIZE All video is shot at 72 px/inch - DV NTSC - 720 x 480 (SD is 720 x 486) DV PAL - 720 x 576 (SD PAL is 720 x 576) HD comes in both progressive and interlaced. HD480i is usual broadcast TV 480p is 480 progressive. 720i is 720 interlaced 720p is progressive. 720 means 720 vertical lines 1080 is 1080 vertical lines. 1080i is most popular. 720p is 1280 x 720, HD 1080 is 1920x1080px. All HD formats are 16:9 aspect ratio. Traditional TV is 4:3 aspect ratio. HDV is 1440 x 1080. New format - is it the new HD version of DV? Cameras like the Sony and JVC make minor alterations to this format when shooting In summary HD 1080i = 1920 x 1080 HD 720p = 1280 x 720 Traditional = 720 x 480 (NTSC) 720 x 576 (PAL) VIDEO OUTPUTS Analog Composite, S-Video, Component in increasing quality. -
EBU Tech 3315-2006 Archiving: Experiences with TK Transfer to Digital
EBU – TECH 3315 Archiving: Experiences with telecine transfer of film to digital formats Source: P/HDTP Status: Report Geneva April 2006 1 Page intentionally left blank. This document is paginated for recto-verso printing Tech 3315 Archiving: Experiences with telecine transfer of film to digital formats Contents Introduction ......................................................................................................... 5 Decisions on Scanning Format .................................................................................... 5 Scanning tests ....................................................................................................... 6 The Results .......................................................................................................... 7 Observations of the influence of elements of film by specialists ........................................ 7 Observations on the results of the formal evaluations .................................................... 7 Overall conclusions .............................................................................................. 7 APPENDIX : Details of the Tests and Results ................................................................... 9 3 Archiving: Experiences with telecine transfer of film to digital formats Tech 3315 Page intentionally left blank. This document is paginated for recto-verso printing 4 Tech 3315 Archiving: Experiences with telecine transfer of film to digital formats Archiving: Experience with telecine transfer of film to digital formats -
Video Source File Specifications
Video Source File Specifications Limelight recommends the following specifications for all video source files. Adherence to these specifications will result in optimal playback quality and efficient uploading to your account. Edvance360 Best Practices Videos should be under 1 Gig for best results (download speed and mobile devices), but our limit per file is 2 Gig for Lessons MP4 is the optimum format for uploading videos Compress the video to resolution of 1024 x 768 Limelight does compress the video, but it's best if it's done on the original file A resolution is 1080p or less is recommended Recommended frame rate is 30fps Note: The maximum file size for Introduction Videos in Courses is 50MB. This is located in Courses > Settings > Details > Introduction Video. Ideal Source File In general, a source file that represents the following will produce the best results: MP4 file (H.264/ACC-LC) Fast Start (MOOV atom at the front of file) Progressive scan (no interlacing) Frame rate of 24 (23.98), 25, or 30 (29.97) fps A Bitrate between 5,000 - 8,000 Kbps 720p resolution Detailed Recommendations The table below provides detailed recommendations (CODECs, containers, Bitrates, resolutions, etc.) for all video source material uploaded to a Limelight Account: Source File Element Recommendations Video CODEC Recommended CODEC: H.264 Accepted but not Recommended: MPEG-1, MPEG-2, MPEG-4, VP6, VP5, H.263, Windows Media Video 7 (WMV1), Windows Media Video 8 (WMV2), Windows Media Video 9 (WMV3) Audio CODEC Recommended CODEC: AAC-LC Accepted but not Recommended: MP3, MP2, WMA, WMA Pro, PCM, WAV Container MP4 Source File Element Recommendations Fast-Start Make sure your source file is created with the 'MOOV atom' at the front of the file. -
NTSC Specifications
NTSC Modulation Standard ━━━━━━━━━━━━━━━━━━━━━━━━ The Impressionistic Era of TV. It©s Never The Same Color! The first analog Color TV system realized which is backward compatible with the existing B & W signal. To combine a Chroma signal with the existing Luma(Y)signal a quadrature sub-carrier Chroma signal is used. On the Cartesian grid the x & y axes are defined with B−Y & R−Y respectively. When transmitted along with the Luma(Y) G−Y signal can be recovered from the B−Y & R−Y signals. Matrixing ━━━━━━━━━ Let: R = Red \ G = Green Each range from 0 to 1. B = Blue / Y = Matrixed B & W Luma sub-channel. U = Matrixed Blue Chroma sub-channel. U #2900FC 249.76° −U #D3FC00 69.76° V = Matrixed Red Chroma sub-channel. V #FF0056 339.76° −V #00FFA9 159.76° W = Matrixed Green Chroma sub-channel. W #1BFA00 113.52° −W #DF00FA 293.52° HSV HSV Enhanced channels: Hue Hue I = Matrixed Skin Chroma sub-channel. I #FC6600 24.29° −I #0096FC 204.29° Q = Matrixed Purple Chroma sub-channel. Q #8900FE 272.36° −Q #75FE00 92.36° We have: Y = 0.299 × R + 0.587 × G + 0.114 × B B − Y = −0.299 × R − 0.587 × G + 0.886 × B R − Y = 0.701 × R − 0.587 × G − 0.114 × B G − Y = −0.299 × R + 0.413 × G − 0.114 × B = −0.194208 × (B − Y) −0.509370 × (R − Y) (−0.1942078377, −0.5093696834) Encode: If: U[x] = 0.492111 × ( B − Y ) × 0° ┐ Quadrature (0.4921110411) V[y] = 0.877283 × ( R − Y ) × 90° ┘ Sub-Carrier (0.8772832199) Then: W = 1.424415 × ( G − Y ) @ 235.796° Chroma Vector = √ U² + V² Chroma Hue θ = aTan2(V,U) [Radians] If θ < 0 then add 2π.[360°] Decode: SyncDet U: B − Y = -┼- @ 0.000° ÷ 0.492111 V: R − Y = -┼- @ 90.000° ÷ 0.877283 W: G − Y = -┼- @ 235.796° ÷ 1.424415 (1.4244145537, 235.79647610°) or G − Y = −0.394642 × (B − Y) − 0.580622 × (R − Y) (−0.3946423068, −0.5806217020) These scaling factors are for the quadrature Chroma signal before the 0.492111 & 0.877283 unscaling factors are applied to the B−Y & R−Y axes respectively. -
Hdtv (High Definition Television)
WHITE PAPER HDTV (High DefinitionT elevision) and video surveillance Table of contents Introduction 3 1. HDTV impact on video surveillance market 3 2. Development of HDTV 3 3. How HDTV works 4 4. HDTV standardization 6 5. HDTV formats 6 6. Benefits ofH DTV in video surveillance 6 7. Conclusion 7 Introduction The TV market is moving rapidly towards high-definition television, HDTV. This change brings truly re- markable improvements in image quality and color fidelity. HDTV provides up to five times higher resolu- tion and twice the linear resolution compared with traditional, analog TV. Furthermore, HDTV comes with wide screen format and DVD-quality audio. Growth in the consumer market for HDTV is impressive. In 2007 the HDTV household penetration in the U.S. was approximately 35%. According to estimates, 85% of all viewers will have an HDTV set at home by 2012. Already today, virtually all major television productions are HD. The two most important HDTV standards today are SMPTE 296M and SMPTE 274M, which are defined by the Society of Motion Picture and Television Engineers, SMPTE. 1. HDTV impact on video surveillance market This development is now starting to have an impact on the video surveillance market, as customers ask for higher image quality standard. The possibility of clearer, sharper images is a long sought quality in the surveillance industry, i.e. in applications where objects are moving or accurate identification is vital. It can be argued that some of these requirements can be met with megapixel network cameras. How- ever the notion of “megapixel” is not a recognized standard but rather an adaptation of the industry’s best practices and it refers specifically to the number of image sensor elements of the digital camera. -
Video Processor, Video Upconversion & Signal Switching
81LumagenReprint 3/1/04 1:01 PM Page 1 Equipment Review Lumagen VisionPro™ Video Processor, Video Upconversion & Signal Switching G REG R OGERS Lumagen VisionPro™ Reviewer’s Choice The Lumagen VisionPro™ Video Processor is the type of product that I like to review. First and foremost, it delivers excep- tional performance. Second, it’s an out- standing value. It provides extremely flexi- ble scaling functions and valuable input switching that isn’t included on more expen- sive processors. Third, it works as adver- tised, without frustrating bugs or design errors that compromise video quality or ren- Specifications: der important features inoperable. Inputs: Eight Programmable Inputs (BNC); Composite (Up To 8), S-Video (Up To 8), Manufactured In The U.S.A. By: Component (Up To 4), Pass-Through (Up To 2), “...blends outstanding picture SDI (Optional) Lumagen, Inc. Outputs: YPbPr/RGB (BNC) 15075 SW Koll Parkway, Suite A quality with extremely Video Processing: 3:2 & 2:2 Pulldown Beaverton, Oregon 97006 Reconstruction, Per-Pixel Motion-Adaptive Video Tel: 866 888 3330 flexible scaling functions...” Deinterlacing, Detail-Enhancing Resolution www.lumagen.com Scaling Output Resolutions: 480p To 1080p In Scan Line Product Overview Increments, Plus 1080i Dimensions (WHD Inches): 17 x 3-1/2 x 10-1/4 Price: $1,895; SDI Input Option, $400 The VisionPro ($1,895) provides two important video functions—upconversion and source switching. The versatile video processing algorithms deliver extensive more to upconversion than scaling. Analog rithms to enhance edge sharpness while control over input and output formats. Video source signals must be digitized, and stan- virtually eliminating edge-outlining artifacts. -
Newnes Guide to Television & Video Technology.Pdf
Newnes Guide to Television and Video Technology Newnes Guide to Television and Video Technology Third edition Eugene Trundle, TMIEEIE, MRTS, MISTC OXFORD AUCKLAND BOSTON JOHANNESBURG MELBOURNE NEW DELHI Newnes An imprint of Butterworth-Heinemann Linacre House, Jordan Hill, Oxford OX2 8DP 225 Wildwood Avenue, Woburn, MA 01801-2041 A division of Reed Educational and Professional Publishing Ltd A member of the Reed Elsevier plc group First published 1988 Second edition 1996 Third edition 2001 # Eugene Trundle 1988, 1996, 2001 All rightsreserved.No part of thispublication may be reproduced in any material form (including photocopying or storing in any medium by electronic means and whether or not transiently or incidentally to some other use of this publication) without the written permission of the copyright holder except in accordance with the provisions of the Copyright, Designs and Patents Act 1988 or under the terms of a licence issued by the Copyright Licensing Agency Ltd, 90 Tottenham Court Road, London, England W1P 9HE. Applications for the copyright holder's written permission to reproduce any part of thispublication shouldbe addressed to the publishers. British Library Cataloguing in Publication Data A catalogue record for thisbook isavailable from the BritishLibrary. ISBN 0 7506 48104 Typset by Keyword Typesetting Services Ltd, Wallington, Surrey Printed and bound in Great Britain by MPG BooksLtd, Bodmin, Cornwall Contents Preface to third edition vii 1 Basic television 1 2 Light and colour 15 3 Reading and writing in three colours21