Questions tagged [opencv]

Open Source Computer Vision Library, real time computer vision

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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
154 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
214 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
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1answer
405 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
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0answers
146 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
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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'...
0
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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&...
0
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2answers
3k views

Workon Command not found when using pi, but works from ssh

when I run the work command to get into my cv virtual environment on my pi it displays pi@raspberrypi:~ $ workon cv bash: workon: command not found however when I ssh into my pi from my MacBook and ...
1
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0answers
66 views

Raspberry camera with opencv, measure brightness

I want to build a camera with my Raspi. It should take picture whenever a face is detected. But it should give a warning when the brightness is too low for a good picture. Does anybody know a simlpe ...
1
vote
1answer
447 views

How to read RAW Picamera jpeg images in python

I acquired a set of images with the command raspistill -r -ss 100000 -o image.jpg, and I'd like to process the 'JPEG+RAW' images, which I already obtained, with OpenCV on python. I am aware of ...
3
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1answer
1k views

Install opencv on Raspberry Pi 3 in a different way than compiling from source

I am using Raspbian Stretch on my RPi 3, I wanted to install OpenCV on it. I did this before by following the instructions detailed here . The problem is that this takes a very long time. Lately, I've ...
0
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1answer
90 views

Open CV Cmake g++ does not work on Rasbian jessie

I am compiling Open CV library on Raspbian jessie. I get below error . > -- Check for working CXX compiler: /usr/bin/g++ -- broken > CMake Error at /usr/share/cmake-3.6/Modules/...
0
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1answer
1k views

Access RPi's camera stream in OpenCV C++ (Qt)

I've setup my Raspberry pi 3 B with uv4l and have access to the video stream on http://(raspberry-IP):8080/stream address. Now, I have Qt5(C++) and OpenCV installed on my main computer. How can I ...
0
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2answers
3k views

import cv2 not working Raspberry Pi

I used pip to install opencv3 with the following command on an Anaconda virtual environment. install opencv-python I successfully installed it because I can see the package in pip list. (olfatf)...
1
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0answers
724 views

HTTP IP camera not working on Pi but working on Ubuntu

I have a situation, I have two IP cameras one on RTSP and other on HTTP, I am using Python 3.4.2 and OpenCV 3.4.1 on my Raspberry Pi, I am able to read from My webcam and RTSP IP camera, but when I ...
0
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1answer
115 views

Installing opencv-3.3.0-r5 on Gentoo 64 bit OS at Raspbery Pi 3B+

My linux environment is pi64 /home/demouser # uname -a Linux pi64 4.14.31-v8-b36f4e9e1984+ #1 SMP PREEMPT Sun Apr 1 14:15:34 BST 2018 aarch64 GNU/Linux First time, I use Porthole to emerge opencv-3....
4
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1answer
185 views

Does gpu memory affect video processing speeds using openCV or image array manipulations?

I am using my pi for video processing. The data transformations include image array manipulations and object detection. It does not include any video display. Essentially, the pi takes in a video ...
1
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1answer
305 views

Slow Video Processing

I installed OpenCV libraries in raspberry pi for my project "Air Hockey Robot" and I'm using python for video processing. I am using PS3 eye camera for video capture at 60 fps. But it seems that video ...
0
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1answer
85 views

How to add openCV on PyCharm under rpi 3 B?

I am trying to add OpenCV lib on PyCharm running under Raspbian on a Rpi 3 model B. I tried the jessie version of commands but got stuck on the cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D ...
0
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2answers
1k views

Installing OpenCV 3

I have been trying to install opencv 3 but this github url(https://github.com/Itseez/opencv_contrib/archive/3.3.0.zip) seems not working. But the zip file is downloading when I'm entering above url in ...
2
votes
1answer
6k views

How can I use OpenCV with Python 3 on a Raspberry Pi?

I have installed OpenCV and and access it with Python 2. However, I'm unable to use OpenCV with Python 3. It says "Cannot open shared object". ImportError: libQTtest.so.4: cannot open shared object ...
3
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2answers
6k views

Failed to create MMAL component b'vc.ril.camera': Out of memory

I am trying to run a simple script that listens for a button click and then takes a picture. Once two pictures have been taken it compares the two using OpenCV to calculate the difference. I am ...
0
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2answers
141 views

HEAD is now at 92387b1ef… Fix java version++

I have raspberry pi 3, I want to install OpenCV for python. while I was doing that according to the following steps... sudo apt-get update sudo apt-get upgrade sudo rpi-update sudo reboot sudo apt-...
5
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3answers
655 views

Is it necessary to release Raspberry Pi Camera before rebooting? If so how do I do it?

I have a python3 script that uses OpenCV and a Raspberry Pi cam. It runs almost 24/7. Using crontab the pi will reboot every night at midnight and the script will begin running again. This is mostly ...
1
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0answers
1k views

Cant import cv2 (Model B) Python 3.5

Basically Im very new to linux systems and an, above average in python, I intended to make a program that detect hand gesture (high five , victory one,three etc) , I created my own test code that ...
0
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0answers
929 views

Stream Pi Camera to Server - webRTC

I have setup a raspberry pi to stream an h264 video feed from a pi cam to a remote host using Red5 Pro. I then use openCV cv::VideoCapture to read the stream and process it. Im currently using RTMP ...
0
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1answer
297 views

Segmentation fault error while installing opencv on raspberry pi 3. Any reason for that?

Hi everyone I hope someone could help solve this issue,I'm trying to install openCV 3.3.0 with python 3.5 on the raspberry pi 3 for the second time ( first time I got no module named cv2 ) but this ...
0
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2answers
134 views

How can I add a delay before raspberry pi cam starts recording?

I am using the following command to take video: os.popen('raspivid -1 640 -h480 -fps 25 -o motionCapture/' + timeStamp + '_motion,h264 -t ' + str(timeInSeconds * 1000)) The problem is when I try to ...
0
votes
1answer
1k views

Error installing opencv on RPi2

I am trying to install OpenCV 3.0.0 on RPi2 with raspbian Stretch. When I run the following cmake -D CMAKE_BUILD_TYPE=RELEASE \ -D INSTALL_C_EXAMPLES=ON \ -D INSTALL_PYTHON_EXAMPLES=ON \ -D ...
1
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0answers
378 views

How to wrap a H264 stream to a MP4 container

I have successfully streamed an h264 video over the local network with this command. raspivid -o - -t 0 -n -w 1280 -h 720 -vf -vs -fps 30 -b 3500000 | cvlc -vvv stream:///dev/stdin --sout '#rtp{...
0
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1answer
152 views

Unable to connect access IP webcam

I'm trying to access my phone camera using IP Webcam android app. I'm programming Pi using my laptop via Remote Desktop Connection with a static IP set for Pi. Also I tried to stream webcam from Pi's ...
1
vote
2answers
861 views

Image artifacts in raw TIFF from Pi Camera disappear when I first save as DNG and then convert. What gives?

I'm trying to use the Raspberry Pi plus the NoIR Picamera module V2.1 to collect raw (bayer-filtered) IR images for NDVI analysis of plants (programs written in Python). So far, I haven't found anyone ...
0
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1answer
1k views

OpenCV VideoCapture.isOpened() always returns False?

I followed the installation tutorial at https://www.pyimagesearch.com/2017/09/04/raspbian-stretch-install-opencv-3-python-on-your-raspberry-pi/#comment-451314 , and everything installed fine. But I ...
-1
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1answer
4k views

Can't install OpenCV-3.4.0 on Raspbian Stretch (CMake error)

[Edit: It's Stretch, not Wheezy, sorry.] I'm trying to build openCV on Raspberry Pi, following the instructions at https://www.pyimagesearch.com/2017/09/04/raspbian-stretch-install-opencv-3-python-on-...
2
votes
0answers
1k views

RPi camera stream to OpenCV in Python

I have been searching everywhere and tested what seems to be everything in order to get OpenCV in python to accept a video stream through gst-launch-1.0 from a RPi camera connected to a RPi. So far, I ...
0
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1answer
196 views

Activate Python Script through POST request

I installed and have running the google home + raspberry pi from: http://www.instructables.com/id/Google-Home-Raspberry-Pi-Power-Strip/ I modified the sw1_on.py and sw1_off.py codes to turn on an led ...
1
vote
1answer
71 views

Swap installations between Pis

I have RPi3 with OpenCV 3 installed on it. I have recently bought the Pi Zero and I noticed installing OpenCV 3 on the Zero would take 10 Hours!. Therefore, my question is whether I can replace the SD ...
4
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3answers
7k views

Is there a Raspbian image with OpenCV 3 pre-installed?

After spending days trying to get OpenCV3 to install on Raspbian Stretch, always failing, I thought it would massively help if there's an image with OpenCV pre-installed, which would save several ...
0
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1answer
212 views

Video Output through ssh on Raspbian Minimal + OpenCV example? [closed]

I installed the minimal version of Raspbian Strech on the RPi3. Tried to run the python samples of OpenCV and failed cuz it needed a video output. Is there a work-around?
1
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2answers
620 views

Opencv installation in raspberry pi

While trying to install opencv in Raspberry pi, I got this message ======================================================================== Couln't connect to server from the Internet. ...
2
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1answer
2k views

Found a PyPi Package for Opencv-contrib, but can't install using pip

I'm trying to install OpenCV for python with extra modules on my raspberry pi. The OpenCV website has a set of instructions that I have tried with different variations for the past several months. I ...
0
votes
1answer
3k views

OpenCV 3,2 build hangs/freezes/get stuck during make build on RPi zero w

I have tried to compile OpenCV 3.2 onto my pi Zero W Board running Stretch and i'm using a 16GB SD Card (running SSH on Mac and Python 2.7). Running make to compile openCV takes over 9 hours to get ...
0
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1answer
50 views

one RPI's capability to multi-task with complex Image Processing

I, as part of a project, have decided to implement a small scale version of automated collision avoidance system. I chose to go with Image based object detection. After initial research, I figured out ...
1
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0answers
576 views

OpenCV and PiCamera problem

I want to get photo from raspberry pi camera in python and i tried this code and it's works for me: for filename in camera.capture_continuous('img.jpg'): test_img = cv2.imread('img.jpg') But ...
0
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0answers
393 views

Want to find difference between two frames, but get a lot of noise because of the auto changing on exposure, brightness…(not sure) of the webcam

As title, I tried to use Raspberry Pi + logitech webcam to find the difference between two frames, the following is the code that I used: import cv2 #capture from camera at location 0 cap = cv2....
2
votes
1answer
116 views

Trigger python script from camera images?

I'm doing a project where the pi sits inside a box, with the camera pointed to the bottom. When there is an object inside this box, the raspberry pi is supposed to post to facebook every 10 minutes. ...
1
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0answers
155 views

Face recognition plotting [closed]

I have a program that is using OpenCV to identify faces and profiles. The default Haar cascade is set for frontal or right profile identifier. To find a left profile, I simply flip the image and it ...
6
votes
1answer
964 views

2 usb webcam on raspberry pi with OpenCV

I would like to connect 2 usb webcams to a RaspberryPI and be able to get at least 1920 x 1080 frames at 10 fps simultanously. This will be done using OpenCV. Has anyone done this and knows if this ...
1
vote
1answer
581 views

How to install opencv on raspbian jessie Lite?

I am totally new to raspbian Lite and not know how to install opencv on this os. I need this for my school project which is written in python. I am trying this https://gist.github.com/willprice/...
1
vote
2answers
77 views

How to configure RPi security camera to be active when our cell phones aren't on the wifi network?

I've seen quite a few security camera examples and many have options for a duty schedule that activates the camera during certain specified days/hours to set up a routine. However I have fairly ...