I'm trying to detect rising and/or falling edges in a numpy vector, based on a trigger value. This is kinda like how oscilloscope triggering works. The numpy vector contains floating point values....

Is there an Edge Detection Method that performs significantly better than the Canny Edge Detector ??

I am currently trying to detect the edge of a prism shape materials and find the angle of that shape. I have an original image like this: I wrote a Python program that detects the edge between bur...

Do you happen to have a 1D non-maximum suppression algorithm written in Python. I need it for making a Canny edge detector in Python using scipy that takes as input a 1D intensity vector. I've loo...

I'm using graphviz (dot) to generate an undirected multigraph where a lot of the edges are overlapping with nodes and I also have to parallel edges (2 nodes with multiple edges). I tried to use spl...

I am currently working on lines extraction from a binary image. I initially performed a few image processing steps including threshold segmentation and obtained the following binary image. As can ...

I am looking for the equivalent implementation of the laplacian of gaussian edge detection. In matlab we use the following function [BW,threshold] = edge(I,'log',...) In python there exist a ...

I'm using graphviz (dot) to generate the graph you can see below. The node in the lower left corner (red ellipse) causes annoyance as its edges cross several edges of the adjacent node. Is there a ...

I am using a sobel filter of size 3x3 to calculate the image derivative. Looking at some articles on the internet, it seems that kernels for sobel filter for size 5x5 and 7x7 are also common, but I...

Here is an example image of what I’m working with: On every image there is a measurement strip. The measurement strip may vary in scale and angle. I’ve identified some intersection with the meas...

UPDATE You can find all the images I have for testing on my GitHub here: GitHub repository with sources There are also 2 videos, where the detection should work on as well ORIGINAL QUESTION I tried...

I'm looking to get the edges of user's head when the user is in front of a web-cam. I tried googling but to no avail. Can someone point me to some ActionScript examples for the same ? Peace \m/

I have an image which I want to detect edges on that. I found Canny has been used a lot ( I don't know whether I have a better option than that). I have set the values as follow: Imgproc.Canny(im...

I developed Android document scanner using OpenCV edge detection functions which does not work all the time as expected and requires a special background in order to work properly like dark plain b...

I've got a task to implement Sobel filter which is, as you know, an image processing filter for edge detection. But unfortunately, I've got no experience in image processing field, to the extent th...

How can I make these lines connect at the target points? The image is a result of a skeletonization process. I'm trying to segment each line as a region using Watershed Transform.

Is it possible to create a polygon from a set of points along a line with rough curvature, such that the points are selected between two values of curvature? I am attempting to retrieve an approxi...

My task is to detect the cracks on the soil surface and calculate crack's total area. I used Canny edge detection for this purpose. Input image Result My next step is to convert canny edg...

I am working with an undirected igraph object composed of nodes of different types (e.g. males M in yellow and females F in orange): g <- graph.atlas(711) V(g)$name <- 1:7 V(g)$gender <- ...

I'm trying to write a ridge detection algorithm, and all of the sources I've found seem to conflate edge detection with ridge detection. Right now, I've implemented the Canny edge detection algorit...

I have a 8-bit image and I want to filter it with a matrix for edge detection. My kernel matrix is 0 1 0 1 -4 1 0 1 0 For some indices it gives me a negative value. What am I supposed to with t...

I am using HoughCircles to detect a ball in real-time, but running Canny on my gray-scale image stream isn't creating all of the edges as it should. To remedy that, I am splitting the rgb image int...

I have to find corners of shapes in an image. i have used Harris corner detection algorithm to find corner, but it is giving total corners present in an image and for finding corners for a particul...

I am trying to extract a portion of an image by performing Canny edge detection. I have succesfully created a mask of that object. But when I perform a bitwise_and operation with the original image...

I am developing a Mac OS X application which, as part of it's UI, will display many visual elements in it's main view which can be selected. These elements can be positioned really anywhere within ...