hugin-devs team mailing list archive

[KFJ <727927@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

When using masks with numbers of points ranging in the hundreds on
images rendered by nona, rendering times increase to several times the
time taken for unmasked images, or images with masks with only a few
tens of points. I posted my observation on hugin-ptx and Bruno said it
should be a bug report. Here's a copy of my initial post:

I'm currently working on a script that relies heavily on masking. The
script generates the masks to arbitrary precision. Most of the time I
was using spacings of about 100 pixels for the masks, and all was well.
Today, while testing, I generated much more precise masks. I set the
spacing to one pixel, and this threw a spanner in the works when I tried
to process the data with nona. I didn't wait for the process to
terminate and tried with 10 pixel stride. This increased processing time
by roughly 200% compared to 100 pixel stride.

So I made the test and made a single-image pto and put a 125-point mask
on the image manually, just to be sure it wasn't some strange effect of
my script. It took nona over 11 seconds to render the image. when I
removed the mask, it only took 4.4 seconds. This was with a 12MP 16bit
TIFF in stereographic projection, on Pre-Release 2010.5.0.a11acbf8be1d.
I wonder if anyone else has noticed this? Has it been like this all
along? Maybe I'm the only one using masks with more than a couple of
dozen points?

I've attached the .msk file which I used to slow down nona.

Kay

** Affects: hugin
     Importance: Undecided
         Status: New


** Tags: mask nona performance

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https://bugs.launchpad.net/bugs/727927

Title:
  complex masks slow down nona considerably

Status in Hugin - Panorama Tools GUI:
  New

Bug description:
  When using masks with numbers of points ranging in the hundreds on
  images rendered by nona, rendering times increase to several times the
  time taken for unmasked images, or images with masks with only a few
  tens of points. I posted my observation on hugin-ptx and Bruno said it
  should be a bug report. Here's a copy of my initial post:

  I'm currently working on a script that relies heavily on masking. The
  script generates the masks to arbitrary precision. Most of the time I
  was using spacings of about 100 pixels for the masks, and all was
  well. Today, while testing, I generated much more precise masks. I set
  the spacing to one pixel, and this threw a spanner in the works when I
  tried to process the data with nona. I didn't wait for the process to
  terminate and tried with 10 pixel stride. This increased processing
  time by roughly 200% compared to 100 pixel stride.

  So I made the test and made a single-image pto and put a 125-point
  mask on the image manually, just to be sure it wasn't some strange
  effect of my script. It took nona over 11 seconds to render the image.
  when I removed the mask, it only took 4.4 seconds. This was with a
  12MP 16bit TIFF in stereographic projection, on Pre-Release
  2010.5.0.a11acbf8be1d. I wonder if anyone else has noticed this? Has
  it been like this all along? Maybe I'm the only one using masks with
  more than a couple of dozen points?

  I've attached the .msk file which I used to slow down nona.

  Kay