Opencv error assertion failed color cpp

[Solved] cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’

Hello Guys, How are you all? Hope You all Are Fine. Today I am just trying to read image through cv2 in my code and I am facing following error cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’ in python. So Here I am Explain to you all the possible solutions here.

Without wasting your time, Let’s start This Article to Solve This Error.

How cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’ Error Occurs ?

I am just trying to read image through cv2 in my code and I am facing following error.

How To Solve cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’ Error ?

  1. How To Solve cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’ Error ?

To Solve cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’ Error Please check image path. This error usually occurs when image is not loaded correctly in any way. Second solution is You might given wrong image location. Or esle try to assign diffrent path. Third Solution is I just give full path and that was worked for me.
cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’

To Solve cv2.error: OpenCV(4.5.2) color.cpp:182: error: (-215:Assertion failed) !_src.empty() in function ‘cv::cvtColor’ Error Please check image path. This error usually occurs when image is not loaded correctly in any way. Second solution is You might given wrong image location. Or esle try to assign diffrent path. Third Solution is I just give full path and that was worked for me.

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Solution 1: Check Image path

Please check image path. This error usually occurs when image is not loaded correctly in any way.

Here is how this error occurs.

Try to giving the image address directly; something like

Solution 2: wrong image location

You might given wrong image location. Or esle try to assign diffrent path.

Solution 3: Give Full Path

I just give full path and that was worked for me.

Summary

It’s all About this issue. Hope all solution helped you a lot. Comment below Your thoughts and your queries. Also, Comment below which solution worked for you?

Источник

OpenCV Error: Failed Assertion #2

Comments

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.

The text was updated successfully, but these errors were encountered:

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’

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

python -c «import numpy; print numpy.__version__»

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.

I have 1.8.2 in both environments

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

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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:

(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:

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.

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

— 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’

Inside virtual env:
$ python #python3.4

Import error no module named cv2.

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

$ 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.

Try:
$ sudo modprobe bcm2835-v4l2

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

/.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.

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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?

Python 2.7
Is it a problem with the version?

Anyone figure out this issue, same as sallyliest over here

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.

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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Smartadm.ru