Category "opencv"

Check if two contours intersect?

I have 2 contours (cont1 and cont2) received from cv2.findContours(). How do I know if they intersect or not? I don't need coordinates, I only need a boolean Tr

How to cv2.imread an image within a zipfile?

I'm trying to use OpenCV2 to read images withing a zipfile with cv2.imread and then resize them and save them but I can't figure out how to read those images wi

Displaying stitched images together without cutoff using warpAffine

I'm trying to stitch 2 images together by using template matching find 3 sets of points which I pass to cv2.getAffineTransform() get a warp matrix which I pass

QT Creator and OpenCV455: 'arm_neon.h' file not found

I'm building a project using qt6 and opencv455. I'm doing this on the new MacBook with a silicon chip (arm64). I can compile the whole project without errors, b

Run time error assigning cv::Mat element value using cv::Mat::at

In the following code I would like to assign a values to elements of a Mat variable in a loop. I get the runtime error below. pair<Mat, Mat> meshgrid(vect

Region Of Intrest

Break masks/ ROIs down into smaller sub-ROIs. Set random seeds. Navigate from seed to ROI in direction of highest absolute gradient.any suggestion would help me

How to use cv::decode (access image) correct?

I need help with the following problem: Task script: read in the message sensor_msgs/PointCloud2, display Bird Eye View image and save (png or jpg). Desired new

cv2.VideoWriter only generate empty file

When I tried to make a video by opencv2, I always end up having an empty file. My python version is 2.7.13 and opencv version is 3.2.0. I am using Windows. I tr

Estimate 3D Line from Image projections with known Camera Pose and Calibration

I know the principle of triangulation for 3D Point estimation from images. However, how would you solve the following problem, I have images from a Line in 3D s

Problem with deprecated conversion from cv::mat to IplImage

I know there were already questions like this in the past but all the answers seem not to work anymore since some functions are deprecated so I hope you can hel

OpenCV: undistort (for images) and undistortPoints are inconsistent

For testing I generate a grid image as matrix and again the grid points as point array: This represents a "distorted" camera image along with some feature po

GStreamer warning when running OpenCV on Ubuntu

I'm trying to get a script running on my raspberry pi (Ubuntu system). Right now, I was just refreshing myself on the basics of opencv, since it's been a little

Importing OpenCV - import cv2 or cv3, and why does the directory matter?

I am trying to use OpenCV for Python 3 for the first time. To install, I simply typed "pip3 install opencv-python" into the terminal. When I do this, I see in F

Open-Cv dnn error for python while using Yolov3. Using open-cv ver(4.2.0)

cv2.error: OpenCV(4.2.0) C:\projects\opencv-python\opencv\modules\dnn\src\darknet\darknet_io.cpp:677: error: (-212:Parsing error) Unknown layer type: in functi

Pipe and OpenCV to FFmpeg with audio streaming RTMP in Python

I'm trying to stream FFmpeg with audio. I will show my code below: Import module import subprocess as sp Create variables rtmpUrl = "rtmp://a.rtmp.youtube.com

'no module named cv2' import error on pytorch

I am currently studying Pytorch and trying to use the cv2 module. I am using Jupyter notebook and Windows. I have installed opencv like this: !pip install op

When applying Gaussian filter the image becomes dark

When I run the following code the output result is blurred but the image gets darker as I increase the value of sigma. Imports import numpy as np import cv2 i

Concatenate 2 videos into 1 using Python

I want to write a program that monitors and tracks objects in 2 different videos using openCV in python (cv2). I would like to Merge the two videos into 1 vide

Ipython cv2.imwrite() not saving image

I have written a code in python opencv. I am trying to write the processed image back to disk but the image is not getting saved and it is not showing any error

How to convert NumPy array into OpenCV (cv2) image

I have attached the image of the code here for better understanding, this would help you figure out what I am actually doingI am working on a project in which I