Talk:Deinterlacing

message: Actually, what is Deinterlacing? I still cannot understand. Can someone make this article using simple English and terminology. because not everyone can understand the way it was described. Help is much appreciated. thanks. from Senyuman
—The preceding unsigned comment was added by 60.50.137.61 (talk) 12:22, 13 January 2007 (UTC)
thread_title: what is it?

message: It would be nice with an explanation of what the interlacing type 'linear' mean.
==
I deleted this link as it crashes firefox hard!
* www.100fps.com What is Deinterlacing? Facts, solutions, examples (along with sample video clips) —The preceding unsigned comment was added by 86.27.66.118 (talk) 22:53, 27 January 2007 (UTC)
thread_title:  Linear Interlacing? 

message: A pedantic take on the terminology: 
- the output of the de-interlacing process are progressive frames;
- frames are considered progressive; fields denote interlaced content; evenness/oddness of a field is related to the set of lines from the original progressive frame that comprise the field: lines 0, 2,.., 2k form the top field. Respectively, odd lines compose the bottom field. 
- it's not necessary that interlaced video content is presented as pairs of fields; this type of content is made of single-field video samples.
- Line doubling is a term used mainly in the Home Theatre discussions. Interpolation would be the more appropriate term, since the missing lines aren't necessarily doubled. 
- the two fundamental approaches to deinterlacing could be better termed as spatial and temporal; of course, combinations of the two also exist;
- the deinterlacing techniques are categorized as follows:
  * BOB line replication: the missing lines are simply copied from one of the existing lines
  * BOB vertical stretch: the missing lines are interpolated from the existing lines of the current field; the standard algorithms use either 2 {1/2, 1/2} or 4 {-1/16, 9/16, 9/16, -1/16}lines;
  * median filtering: a median selection gives the value of the calculated pixels
  * edge filtering: this technique eliminates the combing effect by attempting to detect an edge in the current field; the interpolated pixels are calculated by a filter that follows the edge;
  * field adaptive: depending on the amount of motion detected, the interpolation of pixels is performed by either a spatial filter (within the current field) or a temporal one (using future fields or backward reference frames);
  * pixel adaptive: similar to field adaptive, but at a pixel level (thus much costlier);
  * motion vector steered: requires multiple fields/reference frames, attempts to predict the trajectory of moving objects within the picture.
—The above unsigned remarks were made by 71.112.10.95 on 12 April 2006
I basically like the above remarks a lot.  Except perhaps for the statement that "frames are considered progressive".  It is certainly common to refer to interlaced video frames (SMPTE timecode has a frame counter, etc.), so I think that not all frames should be considered progressive.  To me, a frame is a pairing of a top field and a bottom field that are temporally consecutive or simultaneous, regardless of whether these represent an interlaced-scan (consecutive) or progressive-scan (simultaneous) sampling.  Also, I have some trouble with the idea of "the original progressive frame".  In some interlaced-scan systems there is no original progressive frame - the material is produced using an interlaced scan from the very beginning.  Also, in my experience, many people use the term "line doubling" loosely (and in my opinion not so accurately) to refer to any form of deinterlacing process.
—SudoMonas 05:59, 1 July 2006 (UTC)
thread_title:  A few suggestions 

message: If a video has to be deinterlaced for showing on a TFT display, why isn't it just "deinterlaced" like it would on a CRT display (by the afterglowing). This means, if a video is 50 interlaced fields per second, why don't we just show field 1 and field 2, then field 3 and field 2, then field 3 and field 4, and so on, each for 1/50 second? --Victor--H 16:30, 3 April 2006 (UTC)
thread_title:  Basic question 

message: The article absolutely needs to explain its relationship, and clearly explain the difference in respect, to 3:2 pulldown and reverse telecine, because it is a massively big subject in the audiovisual industry.  There also needs to be more information about the close relationship between deinterlacing and reverse telecine (see reverse telecine section).  Sometimes these two are even confused.  However, 3:2 pulldown removal applies to movies broadcast as video, while deinterlacing applies to video broadcast as video.  Because both movies and video are broadcast, many modern devices (line doublers, upconversion in HDTV sets, some progressive scan DVD players, etc) automatically switch between reverse telecine (3:2 pulldown removal) and deinterlacing, based on algorithms that automatically analyze the video for the prescence of a pulldown sequence in the video.  Chips such as DCDi perform this task.  As proof, there are over 70,000 search results that cover both "3:2 pulldown" and "deinterlacing" on the same page: Search ... A lot of confusion exists because these two (3:2 pulldown and deinterlacing) go hand-in-hand in modern consumer devices nowadays (HDTV's, line doublers, progressive-scan DVD players, etc).  Therefore more consistency needs to exist between the deinterlacing article and the reverse telecine section in the telecine article.  I've added a few sentences to refer to each other, as a result, because of the close relationship that exists here (especially in the explosion of modern end-user video equipment, such as HDTV sets which, when upconverting NTSC 480i material to high-def, automatically do both either deinterlacing or reverse telecine, depending on the video material being displayed). 
--Mdrejhon 22:56, 7 August 2006 (UTC)
thread_title:  More 3:2 pulldown info needed 

message: Hi Guys,
Trying to learn more about deinterlacing and as usual turning to wikipedia.
My basic question is:
Am I better off 
#playing a regular DVD on a regular player, and having the HDTV de-interlace and upscale the DVD? or
#playing a regular DVD on a player which de-interlaces and upscales the DVD, then sends to HDTV?
Not sure if this article is the place to answer such a question - but your heading "where deinterlacing is done" seemed ideal :) 
Greg 12:58, 22 March 2007 (UTC)
thread_title:  question -where deinterlacing is done 

message: These video encoding programs seem to be able to deinterlace, detelecine, etc., almost any kind of video source. How? And should it be mentioned? (With proper citation, etc.) Apple8800 (talk) 09:24, 15 February 2011 (UTC)
replies: text: Provided you don't make it read like an advert for those prodocts, then they probably should.  I look forward to your edit. DieSwartzPunkt (talk) 14:49, 3 May 2011 (UTC)
thread_title:  Handbrake, VisualHub, Wondershare 

message: The article is repeatedly being vandalised by a pair of IP addresses.  The vandalism persistently removes the table of comparison of various deinterlacing methods.
The Ip addresses that are vandalising are:
 and
The edit history of the two user also suggests that they have near identical interests.
The vandalism is identical from the two users and neither user leaves an edit summary (always a reliable sign).  I would have submitted a sockpuppetry report, but the systen seems to have changed and I can't figure out how to do it.  Can someone else oblige or at least tell me where I am going wrong? 86.184.24.140 (talk) 16:29, 16 June 2011 (UTC)
replies: text: I don't think your case would be a particularly good one.  I grant that there is a good reason for suspicion, but I believe that is about as far as it goes.  There does not appear to be any evidence of sockpuppetry elsewhere, so it just might be a complete coincidence that both users (if indeed they are separate users) reintroduced the same deletion of that table from the article, and both users failed to provide an edit summary justifying the deletion. DieSwartzPunkt (talk) 18:16, 16 June 2011 (UTC)
replies: text: You may be right, but it is interesting to note that since the allegation, that there has been no further incident - from either of the sockpuppets. 86.166.68.106 (talk) 17:10, 28 June 2011 (UTC)
thread_title:  Repeated vandalism by a pair of sockpuppets 

message: Can the person who created the table of VLC deinterlacers in Doublers section provide explanations/disabbreviations of its context? I undrestand that in the 2nd and 3rd columns H means half or full frame and FR means frame rate. But what is C and what do numbers 1), 2) up to 7) in the notes and in C (2nd and 3rd column) mean. Please explain. Thank you. — Preceding unsigned comment added by Metaleonid (talk • contribs) 19:42, 5 January 2012‎
:The entire Doublers section is written in non-encyclopedic style with very cryptic language, which is very hard to understand for anyone who is not a hacker, and contains no citations which might suggest original research. Unless this section is rewritten in a more appropriate style and given proper references, I suggest to remove it altogether as it only doubles the content of other section with faux-technical implementation details of some unknown deinterlacing algoryhtm. --Dmitry (talk•contibs) 08:13, 28 February 2012 (UTC)
replies: text:  The entire section has been copied word-for-word from http://wiki.videolan.org/Deinterlace#Appendix:_Technical_summary - while this does not constiture a copyright violation due to LGPL license used on the Videolan Wiki, the section is too technical as it covers implementation details of VLC Media Player. I have removed this section and added an external link instead. --82.179.218.138 (talk) 11:42, 17 May 2012 (UTC)
thread_title:  Doublers section

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thread_title:  Blacklisted Links Found on [[Deinterlacing]] 

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thread_title:  External links modified