option to perspective-warp the input image before motion-detection #153
Conversation
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
jeremybmerrill
changed the title
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
Adds a
MO_WARP_ONoption that, ifTrue, uses opencv's perspective warp to warp the image such that the four points specified inMO_WARP_INPUT_PTSbecome located at the points specified inMO_WARP_OUTPUT_PTS.The points are specified as a list of two-element lists. The points are in clockwise format [bottom-left, top-left, top right, bottom right]. The points are calculated against the 320x240 image (not the source resolution of the camera).
On my 4gb Raspberry Pi 4, this costs about 1% of FPS (from 16.17fps to 15.98fps) -- i.e. the performance cost is negligible.
The reason for this PR is that my street curves within the motion tracking crop area -- so pixel distances within the crop area don't have a consistent relationship to real-world distances in feet/meters/miles. I decided to crop the area to make the distances consistent.
I don't anticipate that this PR is ready to be merged right away, so happy to address any questions.