--- In #removed#, Jim Watters <jwatters@...> wrote:
>
> As a comparison, what is the time to just read and write all the images
> without any processing?
I have no good data, but maybe this is useful: The default output
of PTStitcherNG is layered TIFF. To create flat TIFF-files
the data must be reread and merged. This involves little if any
data processing, just disk-IO, and takes appr. 10min on the PS3
for the 1.4 Gigapixel testimage. The default warp&blend process
takes ~2 read/write cycles, so 22min compared to 2*10min.
Or, from another viewpoint: For large cylindrical panoramas
PTStitcherNG approaches a processing speed of 1.04 million output-
rgb-pixels/sec. For 3 bytes/pixel (uncompressed) and two read/write
cycles this amounts to 12MByte/s. You cannot get much more average
IO-speed on the PS3, which has a standard SATA-drive with ~30MByte/s
peak speed.
We are actually working with compressed data, and the numbers are
slightly different, but the ratio image IO/(imageIO+warp&blend)
is similar.
Regards
Helmut Dersch
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