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CentOS 7.0 - man page for pammixinterlace (centos section 0)

Pammixinterlace User Manual(0)					   Pammixinterlace User Manual(0)

       pammixinterlace - mix adjacent lines to merge interlaced images


       [-filter={linear, fir, ffmpeg}]



       This program is part of Netpbm(1)

       pammixinterlace	is  meant  to operate on an image which is the interlacing of two images,
       where raster rows 0, 2, 4, etc. are from one image  and	rows  1,  3,  5,  etc.	are  from
       another.  (See below for why you might expect to encounter such an image).

       pammixinterlace	makes  each  row  of the output a mixture of the corresponding row of the
       input and its two neighbors.  It uses half of the main row and a quarter each of  the  two
       neighbor rows.

       This  can  be  useful if the image is a video capture from an interlaced video source.  In
       that case, each row shows the subject 1/60 second before or after the two rows  that  sur-
       round it.  If the subject is moving, this can detract from the quality of the image.

       In  video data streams, you often find each frame contains only half the rows of the image
       -- the odd half or the even half.  The displayer of the stream displays the rows in  their
       proper  positions  on a CRT as they come in.  When you display the rows in this order, the
       CRT has less flicker because a particular area of  the  screen  gets  refreshed	twice  as
       often.  In the process of capturing such a stream, computers often generate the interlaced
       image of the type that pammixinterlace works with.  But this interlaced image,  when  dis-
       played  on  a  CRT,  does  not  look  the same as if a displayer were rendering the stream
       directly on a CRT as it arrived, because of the timing of  when	the  various  pixels  get
       drawn and subsequently fade.  That's why you need something like pammixinterlace.

       You  may  prefer  the effect of simply extracting one of two images.  You can do that with

	      This option chooses between one of the three filtering  mechanisms.   linear  is	a
	      linear-blend formula.  fir is a size-5 FIR low-pass filter, and ffmpeg is a formula
	      pulled from the documentation of the program ffmpeg <http://ffmpeg.mplayerhq.hu> .

	      The default is fir.

	      This option turns on "adaptive" filtering mode.  In this mode pammixinterlace modi-
	      fies only pixels that are obviously part of a "comb" pattern.

       pamdeinterlace(1) , pam(1)


netpbm documentation			 22 February 2007	   Pammixinterlace User Manual(0)

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