[OpenDroneMap-dev] OpenDroneMap-dev Digest, Vol 2, Issue 8

[Alex Mandel]

On 03/19/2015 09:07 PM, Cole wrote:
>>
>> You don't want a video, you want still images. I can upload some later.
>> The problem with the video is that it's much lower resolution than time
>> lapse shots from the same camera and you end up grabbing frames from it
>> anyways.
>>
>>
> 1.  A series of images will be fine, 20 would images would suffice.  It
> will allow me to test the calibration againt a known quantity -- the goPro
> camera.  Once I have these I will write a test case.
> 
> 2. From my understanding point cloud reconstruction does not always benefit
> from higher resolution images and adds quite a bit of computing overhead.
> I am working with a fellow student to write up a grant proposal for
> real-time dense point cloud reconstruction from a MAV.  I am starting some
> work with LSD-SLAM, and will hopefully have some point clounds we can
> test.  It will be interesting to see if there is a quality trade off using
> the LSD-SLAM method.
>

Point cloud construction maybe, but orthophotos those pixels are data
for remote sensing purposes. Detecting type of building, plant, etc
depends on the spectral signature.


> 
>> Measuring the checkerboard loss from really close up shots is exactly
>> how I guessed the new sensor size.
> 
> 
> 
> Where do I need to define the corrected sensor size if crop, EXIF?
> 

I haven't found a spot in the EXIF for the sensor size. So I've taken to
changing the Camera Model by adding a U. That way we can list it
separately in the ccd_defs.json file.

Uploading sample photos now. Will send url when they are up.

-Alex