I have a skeletonised image (shown below). I would like to get the intersections of the lines. I have tried the following method below, skeleton is a openCV image and the algorithm returns a lis...

I tried to find contour with cv2 python library in a skeletonized image created with scikit-image and i got this error: contours, hierarchy = cv2.findContours(skel,cv2.RETR_TREE,cv2.CHAIN_APPROX_...

With opencv, I'm detecting contours and selecting some of them: CNTS = [] _, contours, _ = cv2.findContours(gray, cv2.RETR_EXTERNAL, cv2.CHAIN_APPROX_SIMPLE) for c in contours: if some_cond...

I am trying to draw contour around an image. I can see that contours being found but I am not able to draw the outline. The color of the contour seem to be either of the two (black and white) color...

I need to use cv::FindContours() in a program and I have to know the algorithm behind that. What algorithm does openCV use to find contours? How does it work?

I have a 3D plot of a disk. Now I would like to plot the surface in color depending on values which are stored in an array. E.g. the radius of the disk is 300mm. The array could like: arr = np.arr...

I'm trying to isolate letters in a captcha, I managed to filter a captcha and that result in this black and white image: But when I tried to separate the letters with findContours method of Open...

I am trying to generate an image of a random contour using python but I couldn't find an easy way to do it. Here is an example sort of what I want: Initially I tought of doing it using matplotl...

I have drawn a contour around extreme points. Inside polygon figure I have others points. How to check if they are inside contour?

I'm relatively new to ggplot2, and I'm having trouble adding appropriate labels to my contours. Using the classic volcano example, I can add labels to the default contour plot: library(plyr) lib...

I have this image: What I am trying to do is to detect the center of mass of the inner contour (number 3) inside it. This is the code I have right now: import cv2 import numpy as np im = cv2....

I want to crop the biggest object in the image (Characters). This code only works if there is no line (shown in the first image). But I need to ignore the line and make the image of the second imag...

Suppose if we are working on an image, is there any way to access the pixels inside the contour? I have already found the contour using the function findContours() and even found the moments but I ...

I have a pet project to create images of maps, where I draw the roads and other stuff over a contour plot of the terrain elevation. It is intended to plan mountain bike routes (I have made some vec...

I better explain my problem with an Image I have a contour and a line which is passing through that contour. At the intersection point of contour and line I want to draw a perpendicular line at t...

I have a data set formed by a 9 points observed in a combination of 2 variables with 3 values each, i.e. x <- c(0,10,100) y <- c(0,25,30) z <- matrix(c(1,2,3,4,5,6,7,8,9), nrow = 3, ncol ...

The documentation for it is scarce (in contourc function): VN is either a scalar denoting the number of lines to compute or a vector containing the values of the lines. If only one value is want...

I'm attempting to plot my dataset, x and y (generated from a csv file via numpy.genfromtxt('/Users/.../somedata.csv', delimiter=',', unpack=True)) as a simple density plot. To ensure this is self c...

I am trying to generate contours using Plotly. There are 5 contours which I am plotting in a 5x1 grid using subplots. I am unable to see an option by which I can have a separate colorbar for each c...

I'm using OpenCV (Canny + findCountours) to find external contours of objects. The curve drawn is typically almost, but not entirely, closed. I'd like to close it - to find the region it bounds. H...

I am using OpenCV's cv::findContours function to extract contours in a binary image, in particular, I'm extracting a hierarchy of contours (using the CV_RETR_CCOMP flag). At some point in my furthe...

I want to represent data with 2 variables in 2D format. The value is represented by color and the 2 variables as the 2 axis. I am using the contourf function to plot my data: clc; clear; load('da...

I am new to OpenCv with Android.I am trying to make an application which auto detects documents using OpenCv - 2.4.13 . In my app, there is a functionality of detection documents (like a Scanbot ap...

I am trying to draw a line that goes through the given blobs. The following is a given example I want a curve line that goes through multiple blobs in horizontal direction as shown below.

I am trying to identify cards from a photo. I managed to do what I wanted on ideal photos, but I am now having hard time applying the same procedure with slightly different lighting, etc. So the qu...