Questions tagged [opencv]

Open Source Computer Vision Library, real time computer vision

119 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
839 views

Raspicam has low fps for OpenCV

So far, I've tried these tutorials: 1 & 2. I have also attempted to use this code to test it out, and the fps rate is quite low. It's just 2 -3 fps, which is not as high as when I stream via vlc ...
2
votes
0answers
144 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 ...
2
votes
1answer
205 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 ...
2
votes
0answers
134 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 ...
2
votes
0answers
885 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: ...
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 ...
2
votes
0answers
265 views

How to Stream MJPEG from Pi camera?

I want to make something like Surveillance system from pi camera. How can I do that with Opencv and pi camera ? Can anyone please help me to understand How can I do like this example. I am not a pi ...
2
votes
0answers
307 views

Latency on a Raspberry Pi camera

I'm making a flight controller and want to stabilize the x-y plane using optical flow, which requires almost instantaneous processing thus requires almost no latency. How much latency does the Pi ...
2
votes
0answers
718 views

Increase FPS PiCam in Multiprocessing

Currently, my system is only producing 10 FPS out of 20, which is my target. I'm barely hit 15 FPS in single grab-and-show simple code like this: from picamera.array import PiRGBArray from picamera ...
2
votes
0answers
3k views

Simplest way to grab camera images from Java

I want to write a software that runs on the JVM (in Scala but you can think Java). I am looking for the simplest way to capture images from the standard camera module (v2). I find the raspstill quite ...
2
votes
0answers
2k views

Corrupt JPEG data: extraneous bytes before marker, OpenCV C++, Raspberry Pi

I am trying to run OpenCV application on Raspberry PI. When video capture from an external camera starts (Logitech C270), the messages below are printed out: Corrupt JPEG data: 1 extemporaneous bytes ...
2
votes
0answers
721 views

Importing Lepton Thermal Module video feed into OpenCV on Raspberry pi

I'd like to import the video feed that I can capture from a thermal imagery camera I got off sparkfun for a college project of mine. But, I can't seem to get the ./raspberrypi_video into the Video ...
2
votes
0answers
995 views

OpenCV. Can't open video from usb camera on the screen

When I'm trying to start simple code, the frame opens and don't respond. import numpy as np import cv2 cap = cv2.VideoCapture(0) while(True): ret, frame = cap.read() cv2.imshow('AIR',frame) ...
2
votes
0answers
873 views

Is RaspberryPi OpenCV fast enough to run eye blink recognition?

I would like to create application that can recognise eye blink recognition on RaspberryPi with Raspberry Pi Noir camera. Eye blinks are fast, so I will have to process many frames per second. Is ...
1
vote
0answers
16 views

Using gstreamer with openvino opencv in rpi4 without installing gstreamer packages

I am trying to use gstreamer pipeline with openvino opencv-4.1. I don't have the root permission so can't install any packages. So I copied all the needed libs for gstreamer into /usr/local/lib. But ...
1
vote
0answers
29 views

OpenCV cross-compilation fails

I have cross-compiled Qt on my CentOS host for my Raspberry Pi and now I want to cross-compile OpenCV with the following script: CORES=4 IP=192.168.178.52 TEMP_PATH=/home/kampi/OpenCV SYSROOT_PATH=/...
1
vote
0answers
58 views

Issue: Glib-Gobject-warning **: cannot register existing type 'GDKDisplayManager'

I've designed a interface with pyqt and python to my raspberry, so there's no problem when I run a basic test to open the camera ( cv2.imshow('test',frame) this is too basic is just to check if my ...
1
vote
1answer
358 views

Ubuntu 19.10: Enabling and using Raspberry Pi Camera Module v2.1

I have installed Ubuntu 19.10 64-bit on my raspberry pi4 with 1gb ram. I know raspbian would be the better choice, but I have to use Ubuntu for some other reasons. Moreover I know that Ubuntu Mate ...
1
vote
0answers
40 views

How to run “ import serial” and “import cv2” in one python file?

I am actually creating my project wherein I can control my raspberry pi in my pc using FPV Radio Telemetry. The scenario is my pc will send string data like "red" and "blue" to my pi. After my pi ...
1
vote
1answer
99 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 ...
1
vote
1answer
56 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. ...
1
vote
0answers
46 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 ...
1
vote
1answer
456 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
vote
0answers
289 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 ...
1
vote
0answers
82 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....
1
vote
0answers
485 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]...
1
vote
0answers
37 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 ...
1
vote
1answer
45 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 ...
1
vote
0answers
157 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 ...
1
vote
0answers
112 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 ...
1
vote
0answers
213 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 ...
1
vote
0answers
101 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
0answers
892 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 ...
1
vote
0answers
2k 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 ...
1
vote
0answers
442 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{...
1
vote
0answers
701 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 ...
1
vote
0answers
201 views

Unable to start capture: Invalid argument

Below code all are work well but when I add a code publish the live stream through dataplicity. There will occur error "Unable to start capture: Invalid argument i: Error grabbing frames". After the ...
1
vote
0answers
363 views

What is the camera matrix for picamera V2.1?

As you know, all cameras have original camera matrix and distortion coefficient values. Is there any guy who had already gotten exact camera matrix of picamera V2.1?
1
vote
0answers
553 views

Managing employees' attendance using Face Recognition

I'm creating an employees' attendance management system using Face recognition on RPi (2 or 3). I use Python face_recognition library for face detecting and recognition. I currently think of two ways ...
1
vote
1answer
2k views

How to access pi camera with OpenCV to Laptop?

I do not have HDMI supported monitor for Raspberry pi 3. I want to use OpenCV with my pi camera for image processing and access those images and videos with OpenCV image output to my LAPTOP, which is ...
1
vote
0answers
381 views

opencv workon cv doesn't work

I installed opencv on my Pi zero via SSH. And now, if I digit workon cv via SSH it works. But if I digit workon cv in a graphical session (vncserver) terminal, bash responds: no command found.. ...
1
vote
0answers
2k views

OpenCV VideoWriter and Hardware h264

I'm working on a python/pygame application, and i'm facing some difficulties when I try to capture a video from a usb camera (640x480) to a h264 encoded file, through OpenCV. Everything work fine with ...
1
vote
0answers
1k views

White Balance Drift off from Pi Camera

I'm currently trying to develop image tracking using color in Python 3 and OpenCV. But i am facing problem in PiCamera. At the moment, i've done some method to fix white balance, shutter speed, and ...
1
vote
0answers
970 views

How can I get the raspberry Pi camera working with c++ on OpenCV 3.2?

I was pleased to read about the addition of ARM support in the Opencv 3 change log, and decided to try installing OpenCV3.2 on my raspberry Pi. The installation appears to have been a success, and ...
1
vote
0answers
375 views

OpenCV without display

I am running OpenCV on my Raspberry Pi 2. I want to use the GPIO instead of the display as an output indicator. However OpenCV will not run without a display. Is there a way to fool the Raspberry Pi ...
1
vote
0answers
26 views

recording 2 videos of 2 different pictures

I'm using raspberry pi with python and I'm trying to record a video of : regular video stream a picture from that stream that showes a circle identification (using hough transform ) cv2.circle =...
1
vote
0answers
653 views

Optimization of picamera frame decoding for opencv processing

I am useing next code for frame capture: from picamera import PiCamera import utils res = (1600,1600) camera = PiCamera(resolution = res) camera.resolution = res camera.raw_format = 'rgb' camera....
1
vote
0answers
246 views

Using Raspberry Pi 2 B with Pan Tilt and OpenCV 3.0.0 for the 1st Time

I am very new to Raspberry Pi, and This is my first time using it. I have read a lot from the documentation on the official website, and I really got great things. After that I installed OpenCV 3 with ...
1
vote
0answers
177 views

Raspberry pi execution time calculated is different on the desktop terminal and command line?

Boot to desktop and boot to command line can be chosen using raspi-config. I decided to do a test to see whether my code will execute faster using the command line interface. How come the raspberry ...
1
vote
0answers
534 views

Unmount USB Camera

I'm working in a Python app with opencv and a USB camera. Sometimes the camera driver throws an exception: OpenCV Error: Assertion failed (scn == 3 || scn == 4) in cvtColor, file /home/pi/opencv-2....