OpenCV Error: Failed Assertion #2

teeple31 · 2017-03-15T23:26:04Z

Receiving the following error: OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp, line 8000
Traceback (most recent call last):
File "/home/pi/rpotter.py", line 138, in FindWand
old_gray = cv2.cvtColor(old_frame, cv2.COLOR_BGR2GRAY)
cv2.error: /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp:8000: error: (-215) scn == 3 || scn == 4 in function cvtColor

Using the Pi NoIR. Still searching for a solution.

sean-obrien · 2017-03-17T14:10:08Z

Are you running this under a virtual environment? If you try running it outside of a virtual environment does the error change? ᐧ

…

On Wed, Mar 15, 2017 at 6:26 PM, Jason Teeple ***@***.***> wrote: Receiving the following error: OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp, line 8000 Traceback (most recent call last): File "/home/pi/rpotter.py", line 138, in FindWand old_gray = cv2.cvtColor(old_frame, cv2.COLOR_BGR2GRAY) cv2.error: /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp:8000: error: (-215) scn == 3 || scn == 4 in function cvtColor Using the Pi NoIR. Still searching for a solution. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#2>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABQi5Vjm2nyJKj1Oj_hhQOMH9Fl9rnbDks5rmHOMgaJpZM4MeqDG> .

teeple31 · 2017-03-17T14:53:08Z

I am running in the virtual environment.
I just tried outside of the virtual enviroment and now get a different error:

warnings.filterwarnings("ignore", category=np.VisibleDeprecationWarning)
AttributeError: 'module' object has no attribute 'VisibleDeprecationWarning'

sean-obrien · 2017-03-17T18:35:35Z

Can you check your numpy version both inside and outside the virtual environment?

python -c "import numpy; print numpy.__version__"

hebertg626 · 2017-03-17T19:22:53Z

I am also having the same issue as TEEPLE31. And I am also in virtual environment when trying. I will also check my numpy versions.

teeple31 · 2017-03-17T20:19:21Z

I have 1.8.2 in both environments

hebertg626 · 2017-03-17T23:30:05Z

1.12.0 in both.

hebertg626 · 2017-03-17T23:36:40Z

Initializing point tracking
START switch_pin ON for pre-video test
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp, line 8000
Error: /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp:8000: error: (-215) scn == 3 || scn == 4 in function cvtColor

START incendio_pin ON and set switch off if video is running
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.1.0/modules/imgproc/src/color.cpp, line 8000
No points found
Tracking Error: <type 'exceptions.NameError'>

(Raspberry Potter:1189): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed

(Raspberry Potter:1189): GLib-GObject-CRITICAL **: g_object_unref: assertion 'G_IS_OBJECT (object)' failed
Tracking Error: <type 'exceptions.NameError'>

sean-obrien · 2017-03-18T18:08:33Z

Ok - I'm rebuilding so I can dig into this... right now I'm thinking this is related to the virtual environment and the OpenCV python bindings...

hebertg626 · 2017-03-18T18:15:33Z

Thanks so much for the help.

…

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On Mar 18, 2017, at 12:08 PM, sean-obrien ***@***.***> wrote: Ok - I'm rebuilding so I can dig into this... right now I'm thinking this is related to the virtual environment and the OpenCV python bindings... — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

teeple31 · 2017-03-18T20:16:18Z

Everything I am reading is that OpenCV and PiCamera do not play well together.

sean-obrien · 2017-03-20T15:15:00Z

Something to try... What version do you get when you run this outside the virtual env : $ python

>> import cv2 >> cv2.__version__

ᐧ

…

On Sat, Mar 18, 2017 at 3:16 PM, Jason Teeple ***@***.***> wrote: Everything I am reading is that OpenCV and PiCamera do not play well together. — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#2 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABQi5Za46GvanktPXJkecnfWkHfcd2W1ks5rnDuSgaJpZM4MeqDG> .

teeple31 · 2017-03-20T15:34:13Z

3.1

--- Just remembered to check my python instance outside of the virtual env.

Outside of virtual env:
$ python 3.4

import cv2
ImportError: No module named 'cv2'

$ python

import cv2
cv2.version
3.1

Inside virtual env:
$ python #python3.4

hebertg626 · 2017-03-20T21:34:34Z

Import error no module named cv2.

teeple31 · 2017-03-21T00:39:02Z

Problem solved for me. Need to make sure I am running python2.7 in virtual env.

hebertg626 · 2017-03-21T01:27:36Z

I am running 2.7.9 in both environments. Still have the problem though.

…

Sent from my iPhone

On Mar 20, 2017, at 6:39 PM, Jason Teeple ***@***.***> wrote: Problem solved for me. Need to make sure I am running python2.7 in virtual env. — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

hebertg626 · 2017-03-21T01:32:12Z

pi@raspberrypi:~ $ python
Python 2.7.9 (default, Sep 17 2016, 20:26:04)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

import cv2
Traceback (most recent call last):
File "", line 1, in
ImportError: No module named cv2

[1]+ Stopped python
pi@raspberrypi:~ $ source /.profile
pi@raspberrypi: $ workon cv
(cv) pi@raspberrypi:~ $ python
Python 2.7.9 (default, Sep 17 2016, 20:26:04)
[GCC 4.9.2] on linux2
Type "help", "copyright", "credits" or "license" for more information.

teeple31 · 2017-03-21T01:44:24Z

Try:
$ sudo modprobe bcm2835-v4l2

teeple31 · 2017-03-21T01:49:50Z

Meant to say:

$ source ~/.profile
$ workon cv
---assuming you are now in virtual env---
$ sudo pigpiod
$ sudo modprobe bcm2835-v4l2
$ python2.7 rpotter.py

hebertg626 · 2017-03-21T02:06:51Z

Yah buddy. You the man. Thanks so much for the help.

…

Sent from my iPhone

On Mar 20, 2017, at 7:49 PM, Jason Teeple ***@***.***> wrote: Meant to say: $ source ~/.profile $ workon cv ---assuming you are now in virtual env--- $ sudo pigpiod $ sudo modprobe bcm2835-v4l2 $ python2.7 rpotter.py — You are receiving this because you commented. Reply to this email directly, view it on GitHub, or mute the thread.

shaynakapadia · 2017-04-21T21:53:04Z

I am also getting a similar error.
Initializing point tracking
OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp, line 9748
Error: /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp:9748: error: (-215) scn == 3 || scn == 4 in function cvtColor

OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp, line 9748
Traceback (most recent call last):
File "rpotter.py", line 204, in
TrackWand()
File "rpotter.py", line 133, in TrackWand
old_gray = cv2.cvtColor(old_frame, cv2.COLOR_BGR2GRAY)
cv2.error: /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp:9748: error: (-215) scn == 3 || scn == 4 in function cvtColor

sudo modprobe bcm2835-v4l2 fixed the first error, but I am not sure what to do about the 2nd error.

Anyone have any other ideas on how to fix it?

teeple31 · 2017-04-22T01:22:48Z

What version of python do you have installed for the VM?

…

On Fri, Apr 21, 2017 at 5:53 PM sallyliest ***@***.***> wrote: I am also getting a similar error. Initializing point tracking OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp, line 9748 Error: /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp:9748: error: (-215) scn == 3 || scn == 4 in function cvtColor OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp, line 9748 Traceback (most recent call last): File "rpotter.py", line 204, in TrackWand() File "rpotter.py", line 133, in TrackWand old_gray = cv2.cvtColor(old_frame, cv2.COLOR_BGR2GRAY) cv2.error: /home/pi/opencv-3.2.0/modules/imgproc/src/color.cpp:9748: error: (-215) scn == 3 || scn == 4 in function cvtColor sudo modprobe bcm2835-v4l2 fixed the first error, but I am not sure what to do about the 2nd error. Anyone have any other ideas on how to fix it? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#2 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AJwyYvPhIGFhmNXRFRYMr9au_FhIHCGwks5rySVBgaJpZM4MeqDG> .

shaynakapadia · 2017-04-22T19:36:56Z

Python 2.7
Is it a problem with the version?

bkirchman · 2017-06-01T15:11:48Z

Anyone figure out this issue, same as sallyliest over here

shaynakapadia · 2017-06-01T20:43:26Z

A friend of mine figured it out and we got it to work.
I just had to comment out line 250: cam.release()
I also did what teeple3 said to do.

Also make sure you use the code that's in the ollivanderslamp folder.

I ran into a couple other issues with linking the python modules so if you had a problem with that just lmk.

jcfitzg · 2017-12-20T20:14:11Z

I've been working on this damn lamp for so long, and have finally gotten far enough to even understand how to follow your instructions. I have just gotten picture and tracking marks up on the pi via ssh and and pretty proud of myself, but of course I could have done none of it without you sharing your knowledge and experience. Thanks to you, my daughter will have her harry potter lamp under the tree this xmas.

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OpenCV Error: Failed Assertion #2

OpenCV Error: Failed Assertion #2

teeple31 commented Mar 15, 2017

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OpenCV Error: Failed Assertion #2

OpenCV Error: Failed Assertion #2

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