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Topic: Interlaced video

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Deinterlacing

Progressive scan

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	SoundStage! Network Home Theater & Sound -- Video Noise
		The interlaced image became the NTSC broadcast standard for the U.S. and a number of other countries that adopted the same specification.
		Interlacing the image essentially allowed the capture, broadcast, and display of two half-resolution images in such a way that they looked like a single full-resolution image on the television set.
		However, professional progressive video cameras are rarely used today because they are expensive and because broadcast, cable, and satellite TV are all still 99.9% interlaced mediums.
	www.hometheatersound.com /features/videonoise/vn_20010801.htm (1491 words)

	Video - The Film Guide - A Wikia wiki (Site not responding. Last check: 2007-10-12)
		Video is the technology of capturing, recording, processing, transmitting, and reconstructing moving pictures, typically using celluloid film, electronic signals, or digital media.
		Video can be recorded and transmitted in various physical media: in celluloid film when recorded by mechanical cameras, in PAL or NTSC electric signals when recorded by video cameras, or in MPEG-4 or DV digital media when recorded by digital cameras.
		Video quality can be measured with formal metrics like PSNR or with subjective video quality using expert observation.
	filmguide.wikia.com /wiki/Video (1310 words)

	Axis Communications - Progressive scan vs. Interlace video
		Which technique is selected will depend on the application and purpose of the video system, and particularly whether the system is required to capture moving objects and to allow viewing of details within a moving image.
		De-interlacing is the process of converting interlaced video into a non-interlaced form, by eliminating some jaggedness from the video for better viewing.
		Interlaced scanning has served the analog camera, television and VHS video world very well for many years, and is still the most suitable for certain applications.
	www.axis.com /products/video/camera/progressive_scan.htm (504 words)

	Interlaced vs Progressive (Site not responding. Last check: 2007-10-12)
		Perhaps one of the most difficult concepts with video is the two types of displays and encoding - interlaced and progressive.
		Interlaced scanning doubles the rate of images displayed by first scanning all the odd numbered lines and then scanning all the even numbered lines - or vice-versa depending on the equipment.
		With interlaced video, the two fields = one frame, at a rate of 30 frames per sec (60 fields per sec).
	www.infocellar.com /Video/interlace-progressive.htm (523 words)

	Fields, Interlaced Video, Fieldrate Rendering
		Field - one half of a video frame, consisting of either all of the odd-numbered scanlines or all of the even-numbered scanlines in the frame.
		In interlaced video, the scanlines of one field and then the other are displayed on the TV screen to produce a full frame.
		To produced interlaced video, television cameras actually shoot two separate exposures per frame, to capture the two video fields.
	www.3drender.com /glossary/fields.htm (350 words)

	The Big Picture - Interlaced vs. Progressive, Fields vs. Frames, 3:2 pulldown and Inverse Telecine (page 1 of 2)
		Progressive video means that every pixel on the screen is refreshed in order (in the case of a computer monitor), or simultaneously (in the case of film).
		Interlaced video is refreshed to the screen twice every frame - first every Even scanline is refreshed (the little gun at the back of your Cathode Ray Tube shoots all the correct phosphors on the even numbered rows of pixels) and then every Odd scanline.
		What resizing video to a lower resolution basically does is it takes a sample of the pixels from the original source and blends them together to create the new pixels (again that's a gross simplification but it should suffice).
	www.animemusicvideos.org /guides/avtech/video2.htm (637 words)

	Interlacing - Luke's Video Guide
		Interlaced video is a common source of confusion for beginners in the world of digital video.
		Since interlacing artifacts are the result of differences in the two fields in a single frame, there cannot be any interlacing artifacts if you have only one field.
		Telecining is a method by which progressive video that runs at 24 fps (such as a film) is converted to run at 30 fps (or 25 fps for PAL/SECAM video).
	neuron2.net /LVG/interlacing.html (3130 words)

	Digital Video Terminology
		Video signals are split into separate luma and chroma (color) components for higher-quality and more efficient transmission and encoding.
		Video formats and individual clips are typically described in terms of the resolution of the individual frames, and the frame rate at which they are played.
		Video editors simulate the frame rate and appearance of the final program as possible depending on the complexity of the program and the system performance.
	www.manifest-tech.com /links/video_terms.htm (7434 words)

	D-Theater - Questions and Answers (Site not responding. Last check: 2007-10-12)
		Unfortunately interlaced video is a bad habit that is hard for many analog oriented people to break.
		Interlaced artifacts in 1080p/24 frame material converted to 1080i/60 are not nearly as bad as video material initially created in 1080i/60.
		Converting 1080p/24 video to 1080i/60 is asking for at least the addition of noise in the image if not a reduction in horizontal resolution.
	www.videoessentials.com /D_TheaterQA.php (4192 words)

	Progressive vs. Interlaced
		All analog television standards are based on interlaced video, and we're so used to it that it's not something that we typically think about.
		Interlaced video is scanned from side to side, top to bottom, as well.
		Likewise, “1080i” is interlaced video with a frame size of 1920 by 1080 pixels.
	www.canopus.com /canopus/technology/progressivevsinterlaced.php (742 words)

	Interlace - Wikipedia, the free encyclopedia
		Interlace is still used for most standard definition TVs, and the 1080i HDTV broadcast standard, but not for LCD, micromirror (DLP), or plasma displays, which are inherently progressive scan.
		Interlaced video reduces the signal bandwidth by a factor of two, for a given spatial resolution and refresh rate.
		Because interlaced video is composed of 2 fields that are captured at different moments in time, interlaced video frames will exhibit motion artifacts when both fields are combined and displayed at the same moment.
	en.wikipedia.org /wiki/Interlaced (2004 words)

	Lecture on Digital Video (Site not responding. Last check: 2007-10-12)
		It is assumed that you already have a recording of your video on either analog or digital videotape (though the original source could be video from cable, satellite, etc. instead of a tape) and that you want to do some things to improve it before you make a DVD out of it.
		Video capture cards that do a good job convert analog video or DV to MPEG2 video files in real time are still more expensive than such set top recorders as of 2003.
		This is where the editor program transfers video frames to the encoder one by one through a dummy file, and the encoder does its encoding on those frames and writes the result to file in the new format.
	www.towson.edu /~sweyker/cosc109/Video.htm (4258 words)

	Video - Wikipedia, the free encyclopedia
		Video technology was first developed for television systems, but has been further developed in many formats to allow for consumer video recording.
		Video is different than film, which captures a moving image as a sequence of still pictures photographically.
		Video can be recorded and transmitted in various physical media: in magnetic tape when recorded as PAL or NTSC electric signals by video cameras, or in MPEG-4 or DV digital media when recorded by digital cameras.
	en.wikipedia.org /wiki/Video (1517 words)

	Bandwidth Versus Video Resolution - Maxim/Dallas
		The highest frequency contained in a video signal, and therefore in the signal bandwidth, is a function of the scanning system—meaning, the number of scanning lines, the refresh rate, and so forth.
		The 1/2 factor comes from the highest frequency component in a video signal occurring when alternating fl and white vertical lines with a width of one pixel are displayed on the screen.
		The circuits that process video signals need to have more bandwidth than the actual bandwidth of the processed signal to minimize the degradation of the signal and the resulting loss in picture quality.
	www.maxim-ic.com /appnotes.cfm/appnote_number/750 (1532 words)

	The Difference between HDTV, EDTV, and SDTV
		Interlacing was originally invented to save transmission bandwidth, since with an interlaced signal you only need to send half the frame at a time.
		Faroudja is marketing a video processor that will convert 1080i to 1080p, and there are a few very expensive projectors that will handle the scan rates required for this signal.
		Video decoders, deinterlacers, and scalers have all gotten much better at a rapid pace.
	www.projectorcentral.com /video_signals.htm (2549 words)

	Working with Interlaced Video and Fields in After Effects - Support Knowledgebase
		A characteristic of video is its frame rate -- the number of frames per second (fps) to give the impression of motion.
		Each video frame is made-up of two fields: Field 1 and Field 2 (or, as After Effects refers to them, Upper Field and Lower Field, respectively).
		An advantage of interlaced video is that you have twice the amount of visual units (i.e., frames or fields) over which to spread motion.
	www.adobe.com /support/techdocs/319908.html (1185 words)

	Analysing Your DVD Footage
		If you have interlaced footage you need to encode one field at a time to avoid having a chroma channel which is the average of two different images because of the interlacing.
		If you have mostly pure interlaced material you can either try full deinterlacing (smoother motion, not always as good picture quality) or you can try using the avisynth decomb filter but smoothness of motion may be a problem in parts where pure interlacing has been used to make the motion smooth (digital pans etc.).
		When making my Gunbuster video I had two IVTC patterns, one without blends that was jerky in panning shots and one with blends that was smooth in panning shots and I had to use the different sources for different parts of the video depending on the scene.
	www.animemusicvideos.org /guides/avtech/videogetb2a.html (5844 words)

	digitalFAQ.com \| Understanding Video Sources (Site not responding. Last check: 2007-10-12)
		Note the timebase flaws at the top of the signal (skewed video), the missing image data on the left side, and the crawling errors at the bottom of the screen.
		In video, this usually means to put fl over a portion of the image, often to hide noise.
		Too many users insist on using the highest bit-rates and resolutions on their video project, insisting that is what it takes to make "top quality" or "professional-quality" work.
	www.digitalfaq.com /dvdguides/capture/understandsource.htm (4266 words)

	Video to Stills
		But when the video is interlaced, the resulting exported image will be a single field, which only includes either just the even lines, or just the odd lines.
		But when the video is NTSC interlaced video, the resulting image only includes either just the even lines, or just the odd lines.
		This was done using Premiere v6.5 and a valid NTSC interlaced video file (720x480 DV AVI), so I cannot speak for the other versions of Premiere, but this is not working.
	www.infocellar.com /Video/video-to-stills.htm (1711 words)

	Video
		Also very useful were Software generated video, by Rickard Gunée, Video Tutorials by Glen A. Williamson, and various excellent projects by Alberto Riccibitti.
		The goal is to generate non-interlaced, fl and white video, with enough image content to be interesting as a graphics device.
		One lines 30-230, a single line of the the raster is drawn by dumping 16 bytes to the video DAC as fast a possible.
	instruct1.cit.cornell.edu /courses/ee476/video/index.html (892 words)

	Videomaker Forums :: View topic - Possibility of viewing video as interlaced on progressive
		I was thinking about the drawbacks of having interlaced video footage when all computer monitors are progressive scan and perhaps some day all tvs will be progressive scan.
		I know that deinterlacing is a possible solution, but we know that reduces the quality of the video and reduction and video quality tends to show more and more as TV resolutions will keep improving.
		But I was thinking if it would be theoretically possible to view interlaced video as interlaced on a monitor that supposedly only outputs progressive scan.
	www.videomaker.com /forums/viewtopic.php?t=3635 (429 words)

	InFocus Store - DLP LCD Projectors (Site not responding. Last check: 2007-10-12)
		You need a video source capable of producing a progressive signal, and you need a display device capable or reproducing that signal.
		That interlaced television signal appears in a series of 60 of these 'half images' per second for NTSC and 50 per second for PAL.
		DCDi ™ technology was developed by video processing pioneer Faroudja and incorporated into our ultra-high-end home theater equipment to eliminate the jagged edges that appear when standard interlaced video is viewed on progressive scan displays.
	content.infocus.com /store/video_signals.htm (990 words)

	Neat Video community :: View topic - Interlaced video
		The idea here is to first separate the interlaced fields to form a new frame, perform filtering with NV and then combine the fields back to their original positions.
		Actually, the current version (1.5) will work with interlaced footage but deinterlacing implicitly done by VD in this case is not so high quality as that provided by the dedicated "deinterlace" filter, so you may still want to explicitly deinterlace video sequence using "deinterlace".
		I believe interlaced video data is deinterlaced by VD before sending a frame to a plug-in so you have a choice "deinterlace using method A vs deinterlace using method B" rather than "deinterlace vs don't deinterlace".
	www.neatvideo.com /nvforum/viewtopic.php?t=29 (1378 words)

	Windows Media Video 9 Series Codecs
		The following video codecs are supported by the latest versions of Microsoft encoding applications and Windows Media Player, as well as by the Windows Media digital rights management platform.
		In the past, interlaced video content was always de-interlaced before encoding with the Windows Media Video codec.
		Maintaining interlacing in an encoded file is important if the content is ever rendered on an interlaced display, such as a television.
	www.microsoft.com /windows/windowsmedia/9series/codecs/vcm.aspx (931 words)

	VideoHelp.com Forum Archive - Interlaced video ?!?!
		I converted some AVI's to SVCD succesfully, but my AVI's are interlaced (TMPGenc tells me it is) but I didn't use the deinterlace filter.
		Interlaced video is intended for television viewing, so no, you dont have to reencode all of your AVIs if this is what you converted for.
		If your source is interlaced, and you plan to watch on tv, YES!
	www.videohelp.com /forum/archive/t183872.html (173 words)

	Interlaced (Site not responding. Last check: 2007-10-12)
		Saturday Extras (as I’m calling it for now) is a new weekly feature of Interlaced with a bunch of random bits and links that I throw up.
		These are news items that we missed or didn’t feel like writing a whole three paragraphs about.
		It’s an effort to entertain the rest of you who load up websites on the weekend and never find anything new to read.
	www.interlaced.cc (287 words)

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