Questions tagged [opencv]
Open Source Computer Vision Library, real time computer vision
292
questions
0
votes
0answers
13 views
cv2.namedWindow freezes in Raspberry Pi 4
I'm trying to open a namedWindow using openCV in raspberry pi but it freezes after cv2.namedWindow("image")line. However, the project works in Windows. Before it freezes it prints the following ...
0
votes
0answers
16 views
video flickering while streaming with uvc-gadget and g_webcam on raspberry pi 3b+
I am using raspberry pi zero w emulated as a webcam using uvc-gadget. It works plug and play on Nvidia-jetson-nano, or any other pc or laptop. But I see too many choppy frames when I use it with my ...
0
votes
0answers
20 views
Detect fire with pi cam module
I have a python script that uses a usb cam to detect fire with opencv, it worked well until changed to the picamera and now i get this error when i run the code:
File "seeFire.py", line 23, in
...
1
vote
1answer
369 views
How can i install OpenCV on Raspberry Pi 4 (Raspbian Buster)?
I have tried many days to install OpenCV on my Raspberry Pi 4 with Raspbian Buster but i couldn't get it done. The installation always works but when importing or using cv2 methods like cv2.imshow(), ...
1
vote
2answers
58 views
Read ip camera stream video on python using opencv3
I installed opencv3 installation link on my raspberrypi 3 and i've tested this, everything is ok, but when i try to read the ipcamera video stream encountered this error
self.stream = cv2....
0
votes
0answers
30 views
Structure needs cleaning in raspbian while compiling opencv
Good morning
I just want to ask a question about an error message I got all the time is that my system Raspbian said that the structure needs cleaning everytime I started to compile opencv
and when ...
2
votes
1answer
71 views
Opencv VideoCapture much faster than PiCamera
I am trying to process frames from my V2 RPI Camera at high framerates and am stuck with the picamera module. The VideoCapture class from OpenCV seems to be much faster than using PiCamera....
3
votes
2answers
94 views
Run the program in the laptop and use the raspberry gpios
I'm working with face tracking and I want to activate some servomotors depending the motion of my face. For facetracking I'm using, an usb cam, opencv and dlib.
Now results the raspberry can't run my ...
0
votes
0answers
21 views
import dlib fails
I want to use with OpenCV the library dlib, I installed in my virtual environment. I'm sure because with pip list appears:
(Thesis_env) pi@raspberrypi:~/Environments $ pip list
Package ...
1
vote
0answers
36 views
PiCamera vs VideoCapture
So I have a project that requires Computer Vision (video stream). But when I want to try my Pi Camera (not USB), there's two method that I can use. They are PiCamera.capture_continuous and cv2....
0
votes
0answers
11 views
Install openCV in raspbian using another Linux distro [duplicate]
Good morning
I was trying to compile openCV using raspberry 3 and It took me a long time also I had a lot of problems like "Structure need cleaning" (on an installed NOOBS)
I just wonder if I can ...
0
votes
0answers
38 views
capturing video stream using piCam
i'm trying to capture the video stream using piCam.
but i get this warning and the execution stops
this the code:
this the code I used:
import numpy as np
import cv2
cap = cv2.VideoCapture(0)
cap....
0
votes
0answers
36 views
How to run a servo motor if a particular condition is satisfied
I have a script of python which is about object detection once a particular class is identified the servo motor should work
Iam using object detection using tensorflow and opencv , basically scripts ...
1
vote
0answers
76 views
Getting Error: ImportError: No module named 'cv2' in Geany python editor
I'd finally installed OpenCV 4.1.0-dev in my raspberry pi with success,
I checked that in Terminal by :
pi@raspberrypi:~ $ python3
Python 3.5.3 (default, Sep 27 2018, 17:25:39)
[GCC 6.3.0 20170516]...
2
votes
2answers
151 views
How to activate the Python Virtual Environment
I'm trying to install OpenCV in my raspberry (I'm new with it) and I followed this post. I have done all the steps from 0 to 6.
All this installation it's done in a virtual environment, but now I ...
0
votes
0answers
81 views
Raspicam Compilation - Cmake error - class_loader is not a catkin_package
My project require Raspi Camera unit and I install dependencies required following guide here
Running the script below:
sudo ./src/catkin/bin/catkin_make_isolated --install -DCMAKE_BUILD_TYPE=...
0
votes
0answers
34 views
How can I distribute my workload among multiple raspberry pi running an OpenCV Application
I have 4 raspberry pis and one picamera. I wish to distribute my OpenCV task among the 4 pis. I haven't been able to find any good resources for how I could this efficiently anywhere. An approach I ...
0
votes
0answers
108 views
illegal instruction when importing opencv in python 3.5
illegal instruction when importing opencv into python
compiled opencv3 for python 3 by using these commands
$ cd ~/opencv-3.3.0/
$ mkdir build
$ cd build
$ cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D ...
0
votes
0answers
419 views
Installing dlib on raspberry pi3
I've been trying to install dlib on my raspberry pi 3 since past 2 days, but every time end up with a frozen screen. The pi is running on the latest raspbian and
and everything seems like up-to-date, ...
0
votes
0answers
30 views
Using raspvid to stream to PC, I can see data on PC received but how to work with in openCV?
I am using PiCamera on my PI. I am executing this command on the PI:
raspivid -n -t 0 -w 640 -h 480 -fps 30 -o - | nc 192.168.0.12 5000
On my computer (windows), executing this command:
nc -l -p ...
0
votes
0answers
35 views
5 images(jpeg) per second OpenCV from purethermal 2 [duplicate]
Is it possible to capture 5 jpeg images per second from a purethermal 2 stream with opencv or another way on a raspberry pi for a set amount of time? If so how?
(I have a FLIR lepton 3.5 on the ...
1
vote
0answers
57 views
How to 'source ~/.profile' and activate virtual environment and run python script from a .sh file
I am working on my project and using a raspberry pi 3B+ with raspbian OS. I followed the following link to pip install open cv on my pi using a virtual environment I named 'cv' and it works fine: ...
1
vote
1answer
302 views
How to cross compile OpenCV for the Raspberry PI Zero?
Hi so I've got a camera module for my Pi Zero and wanted to play around with OpenCV and Python.
Looking around google, if found a few guides to get OpenCV to a Raspberry but most included to either ...
1
vote
0answers
26 views
How to connect/link two raspberry pies for video precessing?
i am fairly new to raspberry pi platform so this question may be too basic. I am working on a project where i need at least 2 camera modules for simultaneous video recording and processing and taking ...
0
votes
0answers
44 views
Rpi 3b opencv lines of code not registering
I recently installed opencv ans tried to run a simple process some of the commands won't read such as cv2.imshow() or cv2.imread () along with the waitkey() everything else works fine but a few ...
1
vote
1answer
28 views
OpenCV installation error
I've followed this installation guide but on the last part where it says:
Revert back the swap size to its original value of 100MB by editing the /etc/dphys-swapfile. And, restart the service by ...
2
votes
1answer
837 views
How to install OpenCV on Raspbian Stretch?
The directions for Raspbian Jessie fail with Error 2:
...
[ 43%] Building CXX object modules/gapi/CMakeFiles/opencv_test_gapi.dir/test/cpu/gapi_imgproc_tests_cpu.cpp.o
c++: internal compiler error: ...
1
vote
1answer
55 views
Serial comms & USB camera in parallel/threaded?
My project is currently using OpenCV to controll a pair of motors via hardware PWM (am using the pigpio library for GPIO control). The video input is from a USB webcam.
I would like to add some ...
0
votes
1answer
57 views
How to transmit hand gesture data from a laptop to Raspberry-pi
I am making a hand gesture bot. In this hand gestures are detected from a laptop using image processing (used OpenCV & Python). I don't know how to transmit real-time output wirelessly of image ...
2
votes
2answers
106 views
Would ZRAM be helpful for running OpenCV?
I'm doing some OpenCV development on a Raspberry Pi 3, and I have found some information about using ZRAM on the Pi to try and boost its processing effectiveness. I know this isn't actually adding ...
1
vote
0answers
149 views
Error unknown machine command despite compiling without errors
I recently made a project using opencv 4 on my raspberry pi 3 b+, but then decided to port the whole project to a new raspberry pi zero, as I want to make it a permanent setup and want to keep my py 3 ...
0
votes
0answers
107 views
RPi camera OCR,and save output in variable (pyhton with tesseract)
I want to make a python code for the raspberry pi, with the tesseract OCR engine, that it keeps reading text from the camera in realtime, saves in a variable, and sends output to Arduino. Is there a ...
0
votes
1answer
49 views
Dependencies problem installing mmrcn
Hello i am trying to use ML techniques to identify cars in an image using opencv.
I have been following this tutorial : https://medium.com/@ageitgey/snagging-parking-spaces-with-mask-r-cnn-and-python-...
0
votes
0answers
21 views
OpenCV 3.3.0 issue
Hey when i am running code i got this annoying error
#!/usr/bin/env python
import numpy as np
import cv2 as cv
import os
from pantilthat import *
os.system('sudo modprobe bcm2835-v4l2')
cascade = ...
0
votes
0answers
16 views
Using Cakephp running python tensorflow
The program is work in Raspberry Pi using Rasbian Stretch. I have python script with TensorFlow object detection. Now I am using CakePHP to implement the website. In the CakePHP, I want to run the ...
2
votes
1answer
774 views
how to increase fps for raspberry pi for object detection
I'm having low fps for real-time object detection on my raspberry pi
I trained the yolo-darkflow object detection on my own data set using my laptop running windows 10. When I tested the model for ...
0
votes
0answers
107 views
Raspberry Pi shows 100% CPU usage then crashes when I run a python script
Hi I've been working an opencv and python project which the raspi should detect and recognize a face and detect a motion. It works fine with my laptop but after I run it on my raspi the raspi crashes. ...
0
votes
0answers
29 views
A way to synchronise image stream on multiple pis
I am trying to send a sequence of images from a "master" pi to two other pis on the same network. Each "slave" pi will need to receive a different image from the "master" pi but the two images will ...
0
votes
0answers
238 views
Tensorflow object detection script is being killed by system
I'm trying to run an object detection script using Tensorflow. After running the python script it's being killed or freezes. I can see camera's light is being turned on right before the script stops. ...
1
vote
0answers
89 views
When I run the face recognition code, I get the following errors
cv2.error: OpenCV(4.0.1-dev) /home/pi/opencv/modules/highgui/src/window.cpp:610: error: (-2:Unspecified error) The function is not implemented. Rebuild the library with Windows, GTK+ 2.x or Cocoa ...
0
votes
1answer
173 views
OpenCV install 'so' files not found cant insall via apt
Rasp 3 B+, Raspbian
I installed OpenCV using pip3 install opencv-python
Then tried to import cv2 which threw the error..
ImportError: libcblas.so.3: cannot open shared object file: No such file or ...
1
vote
2answers
234 views
Stream remote pi+rasp camera to another computer?
Hi is it possible to stream the video feed from a pi camera (3 b+ model) across a LAN to another computer running Linux?
My idea is to see if pi can be used almost like an IP security camera where I ...
0
votes
0answers
28 views
gpiozero ImportError in virtual environment
I've been trying to use the gpiozero library lately with one of my opencv projects. Installed gpiozero using pip. Sample code works fine, no issues.
The problem is, my opencv installation is in a ...
1
vote
3answers
1k views
can't install opencv on my pi
I'm an absolute Raspberry Pi newbie. My intention is to get some camera vision project working for which I need OpenCV3.3's dnn Python module.
I've found here a description of how OpenCV can be ...
0
votes
1answer
129 views
trying to run 6 USB cameras simultaneously on a single Raspberry Pi 3B+ with add-on 4 port USB hub with external power
We are trying to simultaneously run 6 cameras on a Raspberry Pi 3B+ with an add-on 4 port USB hub that has an external power supply. The cameras are set at 15 FPS with a colour image size of 640 X 480....
0
votes
1answer
193 views
cv2.line is not working in Rpi 3
model no: RPi 3 B
Software: Python 3.5.3
Problem:
I am using opencv 3.4 .I was trying to draw a line using function cv2.line().But it returns nothing.But the same code was working fine in my laptop ...
0
votes
1answer
359 views
RPI object tracking with multiple objects
I have been reading a tutorial on creating a Rpi colour based object tracking system but have been unable to test it due to me being a away from my Rpi. However I have read through the code and it ...
1
vote
0answers
117 views
OpenCv compilation on raspberry pi stops at 16%
I was installing OPENCV on raspberry pi and all are done but when the compilation of opencv it stops at 16%.I used make -j4 as well as make -j1.It gives no error and it comes to build folder.
This is ...
0
votes
1answer
34 views
How to dynamically determine objects based on some uniqueness?
As the title states I looking for a way to (detect and then) determine a object within some range. The object will be forklift or "train" in the factory. Main goal is to provide some GUI from which it'...
0
votes
3answers
2k views
OpenCV 4 error?
When I run the command python faceDetection.py I get the error-
VIDEOIO ERROR: V4L: can't open camera by index 0
Traceback (most recent call last):
File "faceDetection.py", line 21, in <module&...
