On 06.04.20 15:56, Carlos Eduardo G. Carvalho (Cartola) wrote:
- Its performance is a little bit worse than Panini, which I usually
use. The image flow is slower (my machine is an i7 from 2013 without an
Nvidia)
Three more things concerning performance:
- per default, pv uses bilinear interpolation for moving images. If you
want to squash animation rendering times even further and do not mind
aliasing, you can use nearest neighbour interpolation for moving images
instead:
--fast_interpolator_degree=0
- per default, pv does it's internal calculations in linear RGB and
converts the result to sRGB before sending it to the GPU. This is
mathematically correct, but takes time. You can switch to processing in
sRGB, which is okay for simply viewing images, with this option:
--process_linear=false
- also per default, pv checks if the input image has an alpha channel.
If so, it tests if any pixels at all have transparency. If so, alpha
processing is switched on. Even if there is only a single pixel with an
alpha value of 254, this will trigger alpha processing, which also takes
time. You can force alpha processing off:
--alpha=no
I was surprised to find that some of my panoramas done with hugin had
pixels with transparency, even though I had used automatic cropping.
Seems the automatics don't exclude all pixels with a little transparency
(espacially in the corners). So keep this in mind.
Performance comparisons are a dicey issue, a lot of stuff may go on
behind the scenes, and you may end up comparing apples and pears.
I'd be surprised to see CPU-based rendering code which is significantly
faster than pv, as long as the mathematical operations are the same.
It's very highly optimized.
Kay
--
A list of frequently asked questions is available at:
http://wiki.panotools.org/Hugin_FAQ
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