Re: [PanoTools-devel] TIFFTAG_ROWSPERSTRIP

[Pablo d'A. <pab...@we...>]

Hi all,

Max Lyons wrote:
> I've finished working on a version of PTmender that uses cropped TIFF as 
> intermediate files.  This version uses dramatically less memory than the 
> existing version of PTMender.  In fact, it never uses more memory than is 
> required to load the area containing a "cropped" image.

THis is great for big images! Btw. Tracing the image edges using the inverse
transform doesn't work well for equirectangular panos. Just images an image
that is centered on the north pole. All its edges will be far below the
north pole.
Nona uses another algorithm: 1. create a miniature mask 360x180 (using the
normal transformation), dilate that and compute the cropped area using this
mask.

>>With this patch the memory needs of PTmender are twice the number of
>>bytes required to hold the entire image. This is still very lage for
>>large panoramas.  Nona (in my experience) seems to have the same
>>memory footprint.

For cropped TIFF_m output, nona should be very memory efficient, the same as
PTmender. For the assembled formats it requires a memory for all cropped
remapped images and the final panorama.

ciao
  Pablo