Questions tagged [opencv]

Open Source Computer Vision Library, real time computer vision

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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 ...
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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 ...
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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 ...
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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(), ...
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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....
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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 ...
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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....
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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 ...
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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 ...
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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....
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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 ...
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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....
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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 ...
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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]...
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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 ...
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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=...
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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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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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: ...
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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 ...
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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 ...
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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 ...
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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
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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: ...
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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 ...
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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
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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 ...
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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 ...
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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 ...
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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-...
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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 = ...
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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
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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 ...
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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. ...
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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 ...
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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. ...
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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 ...
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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 ...
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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 ...
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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 ...
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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
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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
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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 ...
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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 ...
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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 ...
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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'...
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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&...