BV pipeline broken ?
f...@ltec.ch
I am pretty sure they were working up until OpenPNP 2023-02-14.
It looks like either the stage 'FilterContours' or 'MinAreaRect' do not work as they did in in previous releases.
1. Picture #1 shows the FindContours stage named "5" showing 2 contours.
This is expected and hence okay.
2. Picture #2 shows the FilterContours stage named "9" still showing 2 contours, but reporting only one contour in the text window.
I would have expected, that only one (the larger) contour would show up. This would correspond to they textual result.
3. Picture #3 shows the DrawContours stage named "7" showing two contours but drawing only one.
Drawing only the large contour is expected as this corresponds to the textual result presented in the text window of step 2 above. Again: I would have expected that only the larger contour would appear.
4. Picture #4 shows the MinAreaRect stage named "results" showing two contours and a resulting rectangle containing both contours. This rectangle is much too big as it should only contain the larger contour.
5. Picture #5 shows the DrawRotatedRects stage named "8" which corresponds to the previous step 4, hence also showing a rectangle which is much too big.
Why does that small contour still appear after it is supposed to be filtered out in stage FilterContours?
mark maker
That pipeline will not work, you seem to have moved and disabled the second MaskCircle that is used to blacken the whole image. You seem to have named it "Fix-Bug", so maybe this rings a bell...?
But before you try to fix this outdated pipeline, please just use
the stock OpenPnP pipeline.
It exposes the essential parameters so you don't need to edit the pipeline at all:
To enable it follow the Wiki:
https://github.com/openpnp/openpnp/wiki/Computer-Vision#using-new-stock-pipelines
Ideally combine it with Background Calibration, although for a black nozzle it is not that important:
https://github.com/openpnp/openpnp/wiki/Nozzle-Tip-Background-Calibration
Issues & Solutions can guide you through it, if the calibration on your nozzle tips is yet disabled (so if you want guidance, disable it, Accept, and press Find Issues & Solutions):
https://youtu.be/Pxg6g3KI5_E?t=188
_Mark
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f...@ltec.ch
mark maker
> Nevertheless I seem not to understand the result of the FilterContours stage. I think, the visual representation does not match the textual representation of that stage.
The stage does not manipulate the working image, only the list of
previously detected contours. Many stages do data-only stuff. The
filtered contours are only later drawn on a black
frame using DrawContours, which would manifest the filtering. But
as I said, your pipeline did not create the black frame, so
instead it draws the contours over the camera image. Which
obviously does not manifest the filtering at all, so the
subsequent detection will be wrong.
_Mark
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