[Bf-committers] GSoC 2017: Camera breathing support

Tianwei Shen shentianweipku at gmail.com
Mon Mar 27 19:06:37 CEST 2017

Hi all,

FYI, you can check out my proposal draft on this project at https://docs.google.com/document/d/1J0iFVL45Ha_rFcXtO_fGQdP5hqdPKVQH2P-DYFuAXgk/edit <https://docs.google.com/document/d/1J0iFVL45Ha_rFcXtO_fGQdP5hqdPKVQH2P-DYFuAXgk/edit>, if you are interested.

> On Mar 25, 2017, at 12:08 AM, Jacob Merrill <blueprintrandom1 at gmail.com> wrote:
> what about using a object of known scale to calibrate (like a 3d printed
> susan?)
> On Fri, Mar 24, 2017 at 8:27 AM, Tianwei Shen <shentianweipku at gmail.com <mailto:shentianweipku at gmail.com>>
> wrote:
>> Hi Levon,
>> Thank you so much this long reply. First of all, I’ve been looking for
>> user tests and suggestions for the multi-view reconstruction project. If
>> you have ideas for making it better, just feel free to drop me emails. On
>> the other hand, it is still a quite large patch. So we need time to split
>> it up and gradually merge it into the master. But hopefully this can be
>> integrated well with the camera breathing support project and even
>> automatic tracking in the future.
>> As for the camera breathing support, I didn’t realize lens distortion
>> parameters would also change with the focal lengths. I thought we’d only
>> deal with changing focal lengths with the zoom-in/out motions. So things
>> become complicated here since it seems to me that focal lengths and
>> distortion parameters cannot be estimated on the fly. Users have to first
>> calculate this information (focal lengths for each frames and their
>> corresponding lens distortion parameters) using some calibration tools. Can
>> the solver reliably deal with changing focal lengths and distortions? On
>> the other hand, if users have to first calculate focal distances using some
>> tools (if Blender doesn’t have its own) in the first place, would it impose
>> burden and inconvenience for users?
>> Thanks,
>> Tianwei
>>> On Mar 24, 2017, at 8:57 PM, Levon <levonh at gmail.com> wrote:
>>>> Message: 1
>>>> Date: Fri, 24 Mar 2017 02:26:38 +0800
>>>> From: Tianwei Shen <shentianweipku at gmail.com <mailto:shentianweipku at gmail.com> <mailto:
>> shentianweipku at gmail.com <mailto:shentianweipku at gmail.com>>>
>>>> Subject: [Bf-committers] GSoC 2017: Camera breathing support
>>>> To: bf-blender developers <bf-committers at blender.org <mailto:bf-committers at blender.org> <mailto:
>> bf-committers at blender.org <mailto:bf-committers at blender.org>>>
>>>> Message-ID: <3B4BA086-116B-417D-A288-C8F1CA7A880F at gmail.com <mailto:3B4BA086-116B-417D-A288-C8F1CA7A880F at gmail.com> <mailto:
>> 3B4BA086-116B-417D-A288-C8F1CA7A880F at gmail.com <mailto:3B4BA086-116B-417D-A288-C8F1CA7A880F at gmail.com>>>
>>>> Content-Type: text/plain;       charset=us-ascii
>>>> Hi Everyone,
>>>> Last summer I participated in GSoC 2016 and worked on the multi-view
>>>> camera reconstruction project. Some of my efforts are summarized in this
>>>> blog: http://hlzz.github.io/blender3/ <http://hlzz.github.io/blender3/> <http://hlzz.github.io/blender3/ <http://hlzz.github.io/blender3/>>
>> <http://hlzz.github.io/blender3/ <http://hlzz.github.io/blender3/> <http://hlzz.github.io/blender3/ <http://hlzz.github.io/blender3/>>>.
>>>> And this patch (https://developer.blender.org/D2187 <https://developer.blender.org/D2187> <
>> https://developer.blender.org/D2187 <https://developer.blender.org/D2187>> <
>>>> https://developer.blender.org/D2187 <https://developer.blender.
>> org/D2187>>) is now being reviewed and revised.
>>>> This year I would like to apply again and work on the camera breathing
>>>> support, which is already requested by some users during the time I
>> worked
>>>> on the motion tracking project. Now I need clarifications for some
>> specific
>>>> problems.
>>>> 1. should we automatic detect the changes of focal lengths, or is it
>>>> specified by users as additional inputs (like the focal length for each
>>>> frame)? I know we can read exif tags to get focal lengths for photos.
>> Do we
>>>> have a similar approach for videos?
>>>> 2. Is the current UI able to handle camera breathing, if we need
>>>> additional inputs from users?
>>>> I think this project also has something to do with my revisions done on
>>>> the motion tracking system last summer. Hopefully I should be able to
>> merge
>>>> the revisions and move towards the goal of automatic tracking.
>>>> Thanks,
>>>> Tianwei
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