Questions tagged [opencv]
Open Source Computer Vision Library, real time computer vision
309
questions
0
votes
0answers
10 views
Raspberry Pi4 Error while using 2 USB cameras, VIDIOC_QBUF: Invalid argument
I'm using Python OpenCV to read from 2 USB webcams on a Raspberry Pi4. If I'm using either of the camera individually they work fine.
As soon as I initialize both cameras in the script as following:
...
1
vote
0answers
19 views
imutils VideoStream(src=0) return VIDIOC_QBUF: Invalid argument in raspberry pi
I am only doing a simple code in my Raspberry Pi 4:
from imutils.video import VideoStream
# initialize the video streams and allow them to warmup
print("[INFO] starting cameras...")
webcam = ...
-1
votes
0answers
14 views
Unable to run ALPR on Raspberry Pi 3b+
Hi first time posting here.
Im running Raspbian on Raspberry pi 3b+ and im having issues when i execute command alpr.
when i run alpr
it comes with this output:
"bash: alpr: command not found"
Ive ...
0
votes
2answers
32 views
How to run a raspberry pi program without connected to a desktop screen
I want to be able to run a raspberry pi program without being connected to a desktop screen so the whole idea is to make an object tracking robot using raspberry pi and a camera.
This should be able ...
1
vote
0answers
63 views
raspbian cmake erorr when install open cv in rapsberry pi
I want install open cv and when step using cmake I get stucked.
here the error
CMake Error at CMakeLists.txt:9 (find_package):
By not providing "FindQt5Core.cmake" in CMAKE_MODULE_PATH this ...
-2
votes
3answers
79 views
Raspberry 4 B not booting from raspberry stretch OS
My new pi boots perfectly from Raspian buster but once the sd card is flashed with stretch os then only red light turns on. I need to install stretch os to work with opencv in C++ using geany editor. ...
0
votes
4answers
179 views
Getting stuck at 100% using make -j4 command while installing open cv on Rasbian buster , Raspberry Pi 4 B+
I followed https://medium.com/@patrick_ryan/building-opencv-4-10-on-raspian-buster-and-raspberry-pi4-64669bd2eb74 to install open-cv on my raspberry pi.
On using the make -j4 command it took approx ...
2
votes
1answer
132 views
USB Camera vs Pi Camera
I'm using USB camera for object detection. I can't find code for them because the common blogs or articles are about object detection using pi camera only. Is object detection possible with a USB ...
0
votes
1answer
85 views
how does raspistill/raspivid display video without GUI?
I'm trying to capture video from raspberry pi camera using OpenCV and display it without using gtk or x11. I noticed that raspivid displays camera output without using any window, I wonder if it's ...
2
votes
3answers
425 views
Makefile error at 36% trying to install OpenCV 4 on RaspBerry Pi 4
I've been trying to install OpenCV on my RaspBerry Pi 4 using:
cmake -D CMAKE_BUILD_TYPE=RELEASE \
-D CMAKE_INSTALL_PREFIX=$cwd/installation/OpenCV-"$cvVersion" \
-D ...
0
votes
0answers
43 views
Incorrect buffer length error
I'm trying to do an object detection script and save the results into a csv with tensorflow and opencv.
camera = PiCamera()
camera.resolution = (IM_WIDTH,IM_HEIGHT)
camera.framerate = 10
...
0
votes
2answers
508 views
Pre-built OpenCV on Raspbian Buster
The hassle of installing OpenCV on Raspbian is something many want to avoid, and the easiest way to do this is to use a prebuilt image. I decided to take this route, only to find most pre-built images ...
1
vote
1answer
95 views
Opencv build fails rpi4
I am trying to build opencv as directed for python3.7, on pi4 (2Gb Ram) with Raspbian Buster Lite, everything goes fine until I try
make -j -l 2
After 57% progress I get following error
[ 57%] ...
0
votes
0answers
20 views
NoIR camera - Photo and and video frame size looks different
I'm trying to create a feature matching script using NoIR camera.
What I'm doing is take a picture using and compare it with the real time video feed.
Everything works fine but the the live video ...
2
votes
0answers
80 views
Issue with Raspberry Pi 4 OpenCV
I have been using OpenVINO + NCS2 on a raspberry Pi 3b+ with no issues for an IP camera security application (object detection). I then upgraded to Pi 4 looking for better performances. The object ...
1
vote
1answer
44 views
is the Adafruit read-only script suitable for my project?
I would like to know whether Adafruit's read-only raspi script (described here: https://www.raspberrypi.org/blog/adafruits-read-only/) is suitable for my project.
My project is a camera trap that ...
0
votes
0answers
259 views
How to install OpenVINO and open CV 3.4.X on Raspberry Pi 4 Buster
I have been trying to install OpenVINO on a Raspberry Pi 4 with Buster as the OS.
I have tried these:
https://docs.openvinotoolkit.org/latest/_docs_install_guides_installing_openvino_raspbian.html
...
0
votes
0answers
8 views
Can I save and open multiple videos with OpenCV or any other module/package/method
So, I have been working on a project which requires me to open an animation/video if the user gives an input of a recognized string mentioned in my code. Basically if the word entered by the user is ...
0
votes
0answers
74 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
39 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
37 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
...
2
votes
1answer
5k 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
2k 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
48 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
2answers
503 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
177 views
Run the program in the laptop and use the raspberry gpios, PWM to control servos
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
29 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
48 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
13 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
56 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
71 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
271 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
325 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
218 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
44 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
265 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
885 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
34 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
92 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 ...
2
votes
0answers
94 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
660 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
33 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
56 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
30 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
2k 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
76 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
62 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
168 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
156 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
148 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 ...
