My Autopano Pro forum

arb · 2008-11-09 20:56:51

Hello
When I use the "Maximum time lapse (sec.)" option it doesn't work as documented, selecting most of my images into one group.
Are the units in hours or minutes instead of seconds?

AlexandreJ · 2008-11-10 08:14:20

This value is in seconds. Documentation is here : http://www.autopano.net/wiki/action/vie … e_a_folder

arb · 2008-11-10 11:55:46

AlexandreJ wrote:
This value is in seconds. Documentation is here : http://www.autopano.net/wiki/action/vie … e_a_folder

Yes, thanks, I know about the documentation which is why I am trying to report a bug

Could you do me a favour and test/check it again? When I enter 25 seconds I get all my photos in one group. When I enter 1 second I get much more sensible grouping (and no, I don't take my photos within one second of each other). Am I doing something wrong or misunderstanding it?

leedsjoe · 2008-11-10 20:16:52

Out of interest, it may be relevant for you to say what is in the other parameter - to do with group formation, 'Average Number of Images'.

On this parameter, the wiki says:

"Average number of pictures

Choose an average number of photos in each panorama you shot. This number tells Autopano Pro when the count of images in a group is too big to be a single panorama. Don't forget that you can always move images from one group to another later (or edit groups any way you want) using the Groups View."

Note: reading this again, it does look to me as if the parameter should really be labelled 'Maximum Number of Images' but that is another matter!

hankkarl · 2008-11-10 22:27:18

arb wrote:
AlexandreJ wrote:
This value is in seconds. Documentation is here : http://www.autopano.net/wiki/action/vie … e_a_folder
Yes, thanks, I know about the documentation which is why I am trying to report a bug

Could you do me a favour and test/check it again? When I enter 25 seconds I get all my photos in one group. When I enter 1 second I get much more sensible grouping (and no, I don't take my photos within one second of each other). Am I doing something wrong or misunderstanding it?

From the same webpage,

The grouping algorithm works this way: We have a full set of images sorted by date / time of shooting.

* if this set size is below the number of picture per group, it stops.
* if not, we'll find the greatest delay between two consecutive shots for this group.
o if this greatest delay is below the minimal time lapse, it will not divide this group, as all images were taken with no more than this delay between each shot.
o if not, you'll get two sub groups.

So to get two or more groups
1. you have to have more images than the average number of pictures you select AND
2. you have to exceed the minimum number of seconds between shots.

Looking at this has me asking a question: Let's say
- I shoot 3 eight image panos, with
-60 seconds between panos 1 and 2, and
-60 seconds between panos 2 and 3, but
-someone talks to me so I have a two minute space between images 4 and 5 in pano 2,
-all other shots in a pano are within 15 seconds of each other.

If I set APP to look for groups with 8 images and 30 seconds between shots, what happens? Do I get two panos or three panos?

IIRC, APP used to look for the minimum number of shots in a group, then look for a time between shots greater than the minimal time lapse, so the above example would give 3 eight shot panos. But the new wording is not clear.

Last edited by hankkarl (2008-11-10 22:30:56)

AlexandreJ · 2008-11-11 08:34:37

Yes, it's always a bit difficult to explain that 2 rules system.
The algorithm works this way :
A - if the current groups are bigger than the goal size, continue to divide
B - the division works this way : sort every image by date/time of shooting. Find the bigger time gap in that list : divide the group in 2 sub groups : one with picture before that gap, one with picture after that group.
C - repeat to A until every group are smaller than the goal size.

Note : with that algorithm, you can get groups with time gap between picture bigger than the "Maximum time lapse (sec.)", because it stops dividing groups when reaching the goal size.

arb · 2008-11-13 02:07:10

Thanks for the explanation.

Attached is a screenshot showing what I think is the bug: The number of images is set to 2 (the software won't allow it to be set to 1), and I've set the time to 10 seconds, but my directory has been split into groups containing 5 or 6 images each and the time between images is much greater than 10 seconds. The filename is the EXIF time.

Uploaded Images

AlexandreJ · 2008-11-13 07:18:35

yes, you are right. With those pictures, it should behave like this. If you set 2 as a group goal, it should have divided the group at least 2 or 3 more.
could you share this serie of images for debugging purpose ?

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#1 2008-11-09 20:56:51

Time lapse not in seconds?

#2 2008-11-10 08:14:20

Re: Time lapse not in seconds?

#3 2008-11-10 11:55:46

Re: Time lapse not in seconds?

AlexandreJ wrote:

#4 2008-11-10 20:16:52

Re: Time lapse not in seconds?

#5 2008-11-10 22:27:18

Re: Time lapse not in seconds?

arb wrote:

AlexandreJ wrote:

#6 2008-11-11 08:34:37

Re: Time lapse not in seconds?

#7 2008-11-13 02:07:10

Re: Time lapse not in seconds?

#8 2008-11-13 07:18:35

Re: Time lapse not in seconds?

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