hugin-devs team mailing list archive

[Christoph Spiel <cspiel@xxxxxxxxxx>]

> Perhaps this adaptation mechanism at the border ceases
> to work when the exposure is too far off. There might
> even be a built-in limit to prevent side-effects like
> increased noise.

Neither is there an `adaptation mechanism' nor a `built-in limit'.
What you see is just the Mertens/Kautz/van Reeth algorithm at
work.  If you dig deeper in this issue database you may even
find a bug report where Enblend did not exactly reproduce the
parts of the images that were not overlapping.

Please review change
    http://hg.code.sf.net/p/enblend/code/rev/04948f29c8ed
where I added some clarifying paragraphs to the documentation.


** Changed in: enblend
       Status: Triaged => In Progress

** Changed in: enblend
   Importance: Undecided => Low

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https://bugs.launchpad.net/bugs/1649122

Title:
  Enfuse brightness mismatch in deghosted area

Status in Enblend:
  In Progress

Bug description:
  Enfuse results in a brightness mismatch of dark deghosted areas when
  exposure-mu is decreased from its default value.

  Program Version:
  - enfuse 4.1.3 (could not compile 4.2)

  Platforms:
  - Debian Jessie
  - OS X 10.11.6 via MacPorts

  
  == Testcase Files ==

  https://www.dropbox.com/sh/8la13xukmfamjk5/AACI6mruatMEsZ27wZgl8ysha?dl=0

  Bracketed exposures:
  161022_tc2_7079.tif - RGBA
  161022_tc2_7081.tif - RGBA
  161022_tc2_7083.tif - RGBA
  161022_tc2_7085.tif - RGBA
  161022_tc2_7086.tif - RGB

  Enfused results:
  161022_mu00.tif - exposure-mu=0.0
  161022_mu02.tif - exposure-mu=0.2
  161022_mu05.tif - exposure-mu=0.5 (default)

  Commands to reproduce:
  $ enfuse --exposure-mu=0.0 -o 161022_mu00.tif 161022_tc2_70??.tif
  $ enfuse --exposure-mu=0.2 -o 161022_mu02.tif 161022_tc2_70??.tif
  $ enfuse --exposure-mu=0.5 -o 161022_mu05.tif 161022_tc2_70??.tif

  
  == Detailed Description ==

  Deghosting;
  All exposures except the lightest one (..7086) share the same alpha channel which masks a dark area in the middle of the image for deghosting of moving leaves. The masking is binary, there are no partially masked pixels.

  When I change the exposure-mu parameter from its default 0.5 to a
  smaller value to darken the image, the deghosted area stays much
  lighter than its surroundings. The problem does not occur when
  deghosting a bright area using pixels from a dark exposure.

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