Missed license plates due to incorrect polygon comparison

[neillbell]

Event Server version

5.15.6

Hooks version

For reasons I don't understand, printing the version gives me:

python3 -c "import pyzm; print (pyzm.ml.__version__)"
Traceback (most recent call last):
  File "<string>", line 1, in <module>
AttributeError: module 'pyzm' has no attribute 'ml'

I'm using pyzm-0.1.19.

The version of ZoneMinder you are using:

1.35.5

What is the nature of your issue

Bug

Details

Some license plate detections are ignored. In zmesdetect_m6.log and mlapi.log it is clear that a license plate was detected. However, in zmesdetect_m6.log we see the lines:

08/11/20 19:35:57 zmesdetect_m6[10188] DBG1 image_manip.py:351 [valid plate: polygon in process=[(407, 681), (487, 681), (487, 723), (407, 723)]]
08/11/20 19:35:57 zmesdetect_m6[10188] DBG1 image_manip.py:355 [valid plate: mask in process=[(0, 0), (1200, 0), (1200, 675), (0, 675)]]
08/11/20 19:35:57 zmesdetect_m6[10188] DBG1 image_manip.py:377 [plate:******* at POLYGON ((407 681, 487 681, 487 723, 407 723, 407 681)) does not fall into any polygons, removing...]

It looks like the license plate polygon is being compared to a polygon representing the scaled 1200px image instead of the full image.

This may be too deep in the detection stuff for consideration, but it seems like it should be an obvious issue to someone who is smarter than me.

Debug Logs mlapi.log zmesdetect_m6.log

[pliablepixels]

All the ML code has moved to pyzm. You probably have an old version (I haven't yet released the master code - there are many breaking changes to ES) I don't quite remember why alpr.py is rescaling the image. It is already done by zm_detect.py What happens if you do a return (1,1) right at the top in getscale()? https://github.com/pliablepixels/pyzm/blob/master/pyzm/ml/alpr.py#L48

[pliablepixels]

I think I fixed this with the latest update - please test. (pyzm needs to be updated as well, which will be taken care of by install.sh)

[neillbell]

Works with the latest update. Thanks!