On 28 Sep., 19:21, JPW <[email protected]> wrote: > Easy, Kay. > Please assume the best of me, as I do of you. And remember, as I have > told you, I am a totally naive user of any but the most basic feature > of Hugin, PanoTools and command line programs in general.
Ooops... my fault. I did mean you should set exposure sigma to 50, not exposure mu. I gave you a mixed message: > On Sep 28, 6:59 am, kfj <[email protected]> wrote: > > ... > > pixels from all images and just use the fusing mechanism. But a large > > value for exposure-sigma should do the trick as well. so for your > > enfuse options, try something like > --saturation-weight=0 --exposure-mu=50 <<<< typo. arrgh. sorry Let me explain: enfuse looks at all pixels in all images in turn. For every pixel, it calculates it's 'quality' by a certain criterion. When taking well-exposedness as criterion, how can well-exposedness be defined? Enfuse's approach is to look how 'near' the pixel is to a 'good' exposure. --exposure-mu defines 'good' and --exposure-sigma defines 'near'. The default value of exposure-mu of 0.5 means that per default pixels which are precisely between black (0) and white(1) are considered 'good'. The 'near' parameter is more difficult to grasp - it's the standard deviation from the mean defined with exposure mu, hence the sigma. The default of 0.25 here has the effect that roughly the middle half of brightness values will be considered better than the rest, and the closer to mu the better - it's a gaussian bell curve. If you want to fool enfuse into considering all pixels equally good, you can take a large value for sigma and get a bell curve which is so flat it's almost plane. That's where the sigma of 50 comes in - a value you'd never use for 'real' exposure fusion but which should work for your specific case. After all images in all pixels have been given a quality measure, enfuse combines them, weighting each according to it's quality. If they all have the same 'quality' enfuse will simply produce an average of all inputs, sice it considers them all equally good. Kay -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hugin-ptx
