Auto set min border size to fully capture video

[AdamSpannbauer]

Find how to set minimum area needed for frames to never be cut off by transforms.

~This feature is not a requirement for updated release to pypi; investigate how difficult and add to release if keeps on schedule.~

changing task from investigating to implementing

[AdamSpannbauer]

This looks easy enough to add to tasks to do before release: cv2.transform(pointsToTransform, M)

updating issue

[AdamSpannbauer]

this option should be under: border_type=“black” + border_size=“auto”

Make ”auto” default?

follow-up:

• no need to restrict to 'black', functions fine with other border_types
• still having internal debate on default border_size (0 vs 'auto')

[AdamSpannbauer]

First pass pushed to auto_border branch. Travis passed, but want to run some more varied visual tests before merging into master.

[AdamSpannbauer]

34 adds implementation of border_size='auto'

Need to add input/output example to usage docs

[AdamSpannbauer]

need to revisit implementation and test with more videos. current implementation fails on non-ostrich test videos.

Example (last frame of a stabilization showing all frames in video overlaid):

[AdamSpannbauer]

appears to be fixed by #40