[ptx] Re: Stiching 27 images with different contrast

[Daniel M. German]

Try PTblender. It might work for you (but it does not support contrast
only yet).

dmg


 David Grant twisted the bytes to say:

 David> That sucks, so I guess I'm stuck with it (unless I work really hard to match
 David> the conrast of each image manually). I just had an idea, is there any kind
 David> of software/algorithms, plugins, that can smooth out an entire image?
 David> Basically to auto-contrast it in chunks and then merge the chunks by
 David> interpolating. I think I've heard of such a technique and it has a name, but
 David> I can't think of it...

 David> Dave

 David> On 8/7/06, Emmanuel <emmanuel at favre-nicolin.net> wrote:
 >> 
 >> My experience is that in general stitching with photos with different
 >> exposures leads to problems. The best idea is to use the manual mode or
 >> panoramic mode if it exists.
 >> 
 >> 
 >> On 8/6/06, David Grant <davidgrant at gmail.com> wrote:
 >> >
 >> > Sorry I prematurely hit some google shortcut that caused that message to
 >> > get sent... my last line should have read "-increase the number of levels in
 >> > enblend? but that doesn't change the size of the overlap regions does it?"
 >> >
 >> > On 8/5/06, David Grant <davidgrant at gmail.com > wrote:
 >> > >
 >> > > I have 27 images, I think it was about 4 rows, and because I took them
 >> > > without using my camera's panorama feature, the camera settings are
 >> > > different for each shot and hence the contrast for each picture is a bit
 >> > > different. When I stich it together it ends up not looking too great. Here
 >> > > was my procedure:
 >> > >
 >> > > 1. autopano-sift
 >> > > 2. hugin sticking with nona to multiple tiffs
 >> > > 3. merge all tiffs using enblend
 >> > >
 >> > > I am considering two strategies to fix the problem:
 >> > >
 >> > > -do some contrast adjustment to all pictures first
 >> > > -increase the number of levels in enblend? but that doesn't change the
 >> > >
 >> > >
 >> > > --
 >> > > David Grant
 >> > > http://www.davidgrant.ca
 >> > >
 >> > >
 >> >
 >> >
 >> > --
 >> > David Grant
 >> > http://www.davidgrant.ca
 >> >
 >> 
 >> 


 David> -- 
 David> David Grant
 David> http://www.davidgrant.ca
 David> That sucks, so I guess I'm stuck with it (unless I work really hard to match the conrast of each image manually). I just had an idea, is there any kind of software/algorithms, plugins, that can smooth out an entire image? Basically to auto-contrast it in chunks and then merge the chunks by interpolating. I think I've heard of such a technique and it has a name, but I can't think of it...
 David> <br><br>Dave<br><br><div><span class="gmail_quote">On 8/7/06, <b class="gmail_sendername">Emmanuel</b> &lt;<a href="mailto:emmanuel at favre-nicolin.net">emmanuel at favre-nicolin.net</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
 David> <div>My experience is that in general stitching with photos with different exposures leads to problems. The best idea is to use the manual mode or panoramic mode if it exists.</div><div><span class="e" id="q_10cea7daab757941_1">
 David> <br><br><div><span class="gmail_quote">On 8/6/06, <b class="gmail_sendername">
 David> David Grant</b> &lt;<a href="mailto:davidgrant at gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">davidgrant at gmail.com</a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">

 David> <div>Sorry I prematurely hit some google shortcut that caused that message to get sent... my last line should have read &quot;-increase the number of levels in enblend? but that doesn't change the size of the overlap regions does it?&quot;
 David> <br><br><div><span class="gmail_quote">On 8/5/06, <b class="gmail_sendername">David Grant</b> &lt;<a href="mailto:davidgrant at gmail.com" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">davidgrant at gmail.com
 David> </a>&gt; wrote:</span><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
 David> <div>I have 27 images, I think it was about 4 rows, and because I took them without using my camera's panorama feature, the camera settings are different for each shot and hence the contrast for each picture is a bit different. When I stich it together it ends up not looking too great. Here was my procedure:
 David> <br><br>1. autopano-sift<br>2. hugin sticking with nona to multiple tiffs<br>3. merge all tiffs using enblend<br><br>I am considering two strategies to fix the problem:<br><br>-do some contrast adjustment to all pictures first
 David> <br>-increase the number of levels in enblend? but that doesn't change the <br clear="all"></div><div><span><br>-- <br>David Grant<br><a href="http://www.davidgrant.ca" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">


 David> http://www.davidgrant.ca</a>

 David> </span></div><br clear="all"></blockquote></div><br><br clear="all"><br>-- <br>David Grant<br><a href="http://www.davidgrant.ca" target="_blank" onclick="return top.js.OpenExtLink(window,event,this)">http://www.davidgrant.ca
 David> </a>

 David> </div></blockquote></div><br>

 David> </span></div></blockquote></div><br><br clear="all"><br>-- <br>David Grant<br><a href="http://www.davidgrant.ca">http://www.davidgrant.ca</a>

--
Daniel M. German                  "No iron can stab the heart
                                   with such force as a full
    Isaac Babel ->                 stop put just at the right place."
http://turingmachine.org/
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dmg (at) uvic (dot) ca
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