[Bf-vfx] Non-square shapes for pattern and search areas

Fri Jul 22 00:58:16 CEST 2011

On Thu, Jul 21, 2011 at 3:55 PM, François T. <francoistarlier at gmail.com>wrote:

> and also :
> - this should be automatically animated (one tracker might need different
> position and different size during the track)
> - the anchor point should be able to be outside of the pattern
>

What do you mean by anchor point? I don't understand this request.

> - is having numerical value in UI very useful ? do we really care about ? I
> would rather resize it on the marker itself than going into the property
> panel and having to enter numerical value. Trackers have nice UI with square
> & arrow on the side can't we grab that to do all the manipulation ? (or
> maybe it is planned but not yet implemented :p )
>

We'll get there (on-canvas resizing). I think the current blender tracker
may have been implemented faster than any other tracker in history, given
that e.g. I wrote an entirely new 3D reconstruction pipeline just for
blender, in a matter of days :)

More will come with time!

Keir

>
> cheers,
>
> F.
>
> 2011/7/21 Nathaniel Watson <nathaniel.nw at gmail.com>
>
>> +1 to what Matt and Francois have said; having rectangular trackers is
>> very useful in some specific cases - here's a screenshot of the first
>> example I could find: http://dl.dropbox.com/u/1470205/123531.png <http://dl.dropbox.com/u/1470205/123531.png> (it's
>> not very clear - sorry!)
>> Having the tracker as a smaller square would mean the pattern wouldn't be
>> as unique, so the tracker would probably slide to the similar areas at the
>> right, while making it a larger square would make the pattern grab the
>> foreground area (it's hard to see, but the foreground is on the left of the
>> image, separated by a diagonal line), also resulting in sliding, or a
>> shorter-lived tracker.
>>
>> -Nathaniel
>>
>>
>> On 21 July 2011 20:54, François T. <francoistarlier at gmail.com> wrote:
>>
>>> @julien : they can be useful in some cases yes, especially for 2.5D
>>> tracking, corner pin, Roto,.... check out what people do with it (
>>> http://www.imagineersystems.com) To be honest, it wouldnt be my priority
>>> at least for matchmoe, but it is a very powerful tool, so at some point if
>>> you guys feel like it sure why not ;-)
>>> I personaly use it for all corner pin stuff. (The tutorial Sebastian did
>>> ? it's 10 times easier and faster with planar tracking) and for removal
>>> object as well, but not for matchmove purposes
>>>
>>> @Keir : found an example just right now of a case where I add to use
>>> rectangular pattern w/o any chance to do otherwise *(Of course I cannot
>>> share the footage with you, so you'll have to trust me on that one, or make
>>> the test yourself :) )*
>>> LED + motion blur. They used LED as markers on set. With motion blur the
>>> LED becomes a strip but for a start the pattern has to be as small as the
>>> LED otherwise you will get jittering. but when you get motion blur, the LED
>>> gets wider and the pattern needs to stay at the center of this strip be
>>> correct, so if the pattern is not wider than the blur LED, the marker will
>>> drift. And if you keep it square it might become a big pattern where the LED
>>> brightness is so little compare to the all rest, that the tracker won't care
>>> too much about LED anymore but mostly about what does surround it, which
>>> result also as drift
>>>
>>> hope you got it :p
>>>
>>> cheers
>>> F.
>>>
>>> 2011/7/21 julien michot <julien.michot.fr at gmail.com>
>>>
>>>> This is not *yet* a planar tracker!
>>>>
>>>> What do you think about planar trackers, are they more efficient or
>>>> easier to use?
>>>> Would it be useful to implement one in libmv?
>>>>
>>>> -julien
>>>>
>>>>
>>>> On Wed, Jul 20, 2011 at 10:28 PM, François T. <
>>>> francoistarlier at gmail.com> wrote:
>>>>
>>>>> I don't know why you would need that. This is not planar tracking, so
>>>>> it really doesn't matter at the end.
>>>>>
>>>>> F.
>>>>>
>>>>> 2011/7/20 Sergey I. Sharybin <g.ulairi at gmail.com>
>>>>>
>>>>>>  Hi everyone!
>>>>>>
>>>>>> It was got discussion today in #lbmv at irc.freenode.net related on
>>>>>> forcing pattern/search area be square.
>>>>>>
>>>>>> Main question: is non-square shape of marker useful in motion tracking
>>>>>> workflow?
>>>>>>
>>>>>> Some quick cases i could think could be solved just adding offset to
>>>>>> search area or by resizing this areas.  But we've checked some tracking
>>>>>> applications and they allow to use non-square markers. So i'm not
>>>>>> sure it'll be good idea to stick to squares.
>>>>>>
>>>>>> P.S. From UI point of view, search are could be rectangular, just
>>>>>> "missing" areas could be filled with black when it's passing to libmv which
>>>>>> would probably be optimized for squares.
>>>>>>
>>>>>> --
>>>>>> With best regards, Sergey I. Sharybin
>>>>>>
>>>>>>
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>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> ____________________
>>>>> François Tarlier
>>>>> www.francois-tarlier.com
>>>>> www.linkedin.com/in/francoistarlier
>>>>>
>>>>> _______________________________________________
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>>>>> http://lists.blender.org/mailman/listinfo/bf-vfx
>>>>>
>>>>>
>>>>
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>>>>
>>>
>>>
>>> --
>>> ____________________
>>> François Tarlier
>>> www.francois-tarlier.com
>>> www.linkedin.com/in/francoistarlier
>>>
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>>>
>>
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>
>
> --
> ____________________
> François Tarlier
> www.francois-tarlier.com
> www.linkedin.com/in/francoistarlier
>
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