Questions tagged [opencv]

Open Source Computer Vision Library, real time computer vision

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24 views

Unable to locate various OpenCV dependencies

I'm trying to get OpenCV installed on my Pi 3. I'm following the instructions here, and one of the things it says is to install various dependencies. In particular, I'm trying to run: apt-get ...
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1answer
20 views

OpenCV camera resolution

I am working on a project with OpenCV. It is running on a Raspberry Pi 3 B+. When i start the camera, and do some visual processing the framerate becomes really low and there is a lot of lag. My ...
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0answers
20 views

Raspbian with opencv

I am working on a project that will run on raspberry pi 3 B+. It requires OpenCV and I have a lot of problems installing it(I spent last 2 days trying to install it without any success). I was just ...
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1answer
37 views

symbolic link does not work when using it for cv2.so

I followed a tutorial online for installing opencv4 on raspberry pi. Everything works except when trying to create a symbolic link to my cv2.so. It appears to be working but I can only import cv2 ...
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0answers
28 views

Installing cv2 for python3.7

I've been trying to get opencv to work on my raspberry pi zero w but no matter what I do it doesn't work. I'm using Raspbian Buster Lite (headless) and each time I fail to get opencv to work on the pi ...
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0answers
12 views

Frames from picamera.capture have different length of pixels

I am trying to both stream a video with a websocket and to detect wether something is moving in the camera video. I have finished successfully the websocket part of my project, and right now I want to ...
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0answers
43 views

raspicam slow for real-time usage

I am currently using a raspberry 3 model B and a raspicam version 1.2. I want to use it to detect colour using opencv. I'm taking input using imshow and then using image procesing to obtained the ...
1
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1answer
40 views

What resolutions can I use for the Raspberry PI camera 2? And how can you tell?

I'm working on a project with Raspberry Pi 3 and camera module v2. I'm using OpenCV and raspicam. I want to know the maximum resolution I can use. The datasheet says 3280*2464, but I get errors when ...
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0answers
52 views

OpenCV - how do you access the raspberry pi camera?

I am trying to access the raspberry pi camera with OpenCV. I found some code that I want to use but I think something is wrong with this code: video_capture = cv2.VideoCapture(-1) because later when I ...
1
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1answer
35 views

Activation of Multiple Webcams Simultaneously for Video Recording (Logitech C270)

I needed two cameras for a project requirement. To test the working of the tow cameras together I wrote a short that goes as follows: { import cv2,os import numpy as np webcam = cv2....
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1answer
167 views

opencv not working on Python3

I have installed OpenCv on my Raspberry pi Model 3B. It is working for python 2.7 but not for python 3 The error im getting is: pi@raspberrypi:~ $ python3 Python 3.7.3 (default, Dec 20 2019, 18:57:...
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1answer
76 views

opencv installation

`I tried installing opencv on my raspi 3B using pip, on trying to import cv2 i am getting an error Edit: code lines: Successfully installed opencv-python-4.1.1.26 `(cv) pi@raspberrypi:~ $ workon cv ...
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3answers
6k views

ERROR: Environment '/home/pi/.virtualenvs/cv' does not contain an activate script

I am trying to install opencv 4 on my raspberry pi 4 using these instructions from this website but I have come across an error when I run the command mkvirtualenv cv -p python3. The error is found ...
2
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1answer
35 views

apt-get update - trying to install python OpenCV on rasp pi?

$ apt-get update Reading package lists... Done E: Could not open lock file /var/lib/apt/lists/lock - open (13: Permission denied) E: Unable to lock directory /var/lib/apt/lists/ W: Problem unlinking ...
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1answer
44 views

Can Not able to install python OpenCv on raspberry pi 3?

I have been trying to run my 4WD Smart drive car with raspberry 3. I am using python 3 to implement algorithms and computer vision object detection. I also have a problem with Cheese camera on the pi. ...
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0answers
21 views

TFLite detection model not working properly

I have a school project where I need to build an application for detecting plastic bottles and soda cans. I found a bunch of models that detect bottles but they don't detect cans. I trained TFLite ...
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0answers
37 views

Object detection on Raspberry Pi 4B causes it to crash and reboot

I am trying to do object detection with openCV on images already saved on my raspberry pi's file system, but the system reboots when I run the following python script: import cv2 as cv import ...
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0answers
35 views

OpenCV2 ---> OpenCV4

I have been working on a project from github, https://github.com/twilio/wireless-security-camera, that utilizes OpenCV. Now I haven't played much with OpenCV so this is trial and error on my part. ...
1
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1answer
137 views

OpenCV Gstreamer pipeline doesn't work on Pi 4 Buster

I'm studying about object tracking and detecting in Gazebo Simulation. So, I'm trying to send Simulation video(Gst Plugin) to Raspberry Pi 4 via ethernet cable over UDP stream. And Pi 4 side, catch ...
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0answers
81 views

NDVI calculation using Pi noir camera

I am an engineering student working on a project based on NDVI calculation to monitor the crop health. I used the PiNoIR camera with blue filter for my experiment in order to obtain the values of NIR ...
1
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1answer
77 views

Raspberry Pi Security Camera and Twilio

So I am working on a 4G enabled security camera. While I know there is several options to choose from I was kind of intrigued by the Twilio Security Camera Blueprint, https://www.twilio.com/wireless/...
1
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1answer
416 views

Raspberry pi line follower using camera

I want to create a two-wheeled line following robot. I want to use the camera to detect a black line for the car to follow. I have programmed the wheels so now I need to work on the line detection. I ...
2
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1answer
134 views

Raspberry Pi4 error capturing image with OpenCV, image comes half green

I am using a common logitech webcam with OpenCV. When I was using my RPI3 I had no trouble, but I wanted to improve my system so I bought a RPI4. Upon setting up my system with RPI4 using raspian ...
1
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1answer
178 views

Cannot install OpenCV on Raspberry Pi 2

I've tried following this tutorial: https://www.learnopencv.com/install-opencv-4-on-raspberry-pi/ I installed a fresh copy of Raspbian Buster on the Raspberry Pi 2 before following the tutorial. It ...
1
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1answer
161 views

How to execute a Python 3 + OpenCV 4 script @reboot on Raspbian Lite (headless)?

The Python script works perfectly fine when ran from the command line while signed in as the "pi" user, with this command: python3 /home/pi/www/main.py & But from the crontab, it just doesn't ...
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0answers
49 views

How to create a person or head (not face) detection using open CV that are not too slow when run in Raspberry Pi 3B+?

Hello guys my problem is creating a program that can detect the head(not face) or human detection for my project One of the program that i see is too slow for raspberry pi 3B+ which is this : https:/...
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0answers
40 views

Low Framerate in video recording using picamera

I am trying to record HD video using Picamera and writing it using OpenCV. But I am unable to get the desired frame rate (10 fps). I recorded the video of 1 minute but the video that was saved was ...
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1answer
96 views

ImportError:python2.7/dist-packages/RPIO-2.0: undefined symbol: makedev

I have a problem with RPIO. I am running a face recognition using OpenCV python on Raspberry Pi 3B+. pi@raspberrypi:~/facerec-pi/code $ sudo python capture-positives.py Tradeback (most recent ...
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0answers
275 views

Can't get OpenCV up'n'running in Raspberry Pi, what should I do? (details in the description)

I followed the whole tutorial (https://www.deciphertechnic.com/install-opencv-python-on-raspberry-pi/) line by line, but at the end when I imported the OpenCV library in Python CLI, it gave this error:...
4
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2answers
2k 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
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1answer
317 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 = ...
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2answers
38 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
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0answers
212 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 ...
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3answers
337 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. ...
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4answers
1k 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
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1answer
490 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
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1answer
345 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
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3answers
2k 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
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0answers
352 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 ...
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2answers
1k 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
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1answer
141 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%] ...
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0answers
23 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
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0answers
125 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
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1answer
68 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
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0answers
446 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 ...
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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 ...
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0answers
104 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 ...
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0answers
67 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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0answers
85 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 ...
3
votes
1answer
9k 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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