Stack Overflow
Stack Overflow

Questions tagged [edge-detection]

Edge detection is a tool in computer vision used to find discontinuities (edges) in images or graphs. Use this tag when asking about finding and manipulating edges or edge interaction.

Edge detection is a part of computer vision where the goal is to find edges in images. This often involves computing derivatives of the image with respect to the coordinates, because intuitively if the difference between two neighboring pixels is high, it is likely that there is an edge in the image. A popular edge detection algorithm is the Canny edge detector. Other edge detection algorithm includes Laplace & Sobel.

Discontinuities in image are likely to correspond to

  • discontinuities in depth
  • discontinuities in surface orientation
  • changes in material properties and
  • variations in scene illumination
1057 questions
0
votes
1 answer

check if centerPlane is not near edge in unity

I'm trying to make whack a mole game using project tango. When user start the game, the program will create holes at random point for the moles to come out. Right now, I already can make the hole and spawn the mole at random, though I have a problem…
Tommy Hart'no
  • 123
  • 7
0
votes
1 answer

Defining object edges in images matlab

I am using matlab 2016a Is there any function in the matlab version I am using that will provide me with the same information that is obtained by using the findContours function (with mode=CV_RETR_TREE) from OpenCV? OpenCV findContours Function
Zev S
  • 13
  • 2
0
votes
1 answer

Detection of pellet on petri dish

I am currently doing a project on morphology of filamentous fungi during batch fermentation (Yes, I am not a software engineer.. Biotech). Where I am taken pictures of the morphology in a petri dish. I am developing a "fast" method to describe the…
Martin Agerbæk
  • 1
  • 2
0
votes
1 answer

Edge detection in Image processing

I need to get the rectangular counter of a sobel edge detected and threshold binary image, Does anyone know any suitable algorithm to get the count, which can be implemented using c sharp.
sha123
  • 119
  • 3
  • 10
0
votes
3 answers

Finding edges in a height map

I want to find sharp edges in a heightmap image, while ignoring shallow edges. OpenCV offers multiple approaches to finding edges in a 2d Image: Canny, Sobel, etc. However, all these approaches work by comparing the intensity values on both sides of…
HugoRune
  • 13,157
  • 7
  • 69
  • 144
0
votes
0 answers

Matlab edge detection problems - can I do it manually?

I have a set of roughly 2000 images to process, and have stumbled on a problem regarding my edges. The original images are CT Scans of a heart, which are then thresholded and sobel filtered to produce a binary image of parts of the tissue.…
Daria D
  • 29
  • 3
0
votes
1 answer

Edge Detection Algorithm with Processing (Java)

i want to code an algorithm, that can do an edge detection for an image. I already have a part of the code, which detects all edges in horizontal way. Example picture: But i need an edge detection in horizontal, vertical and diagonal way. If i try…
Sascha
  • 89
  • 7
0
votes
0 answers

Find corners of a page after applying hough transformation

My classmate and I are currently working on a course project and we need some guidance. We decided to recreate "CamScanner" app using Matlab. We can select corners manually and we were successfully able to apply the perspective transformation to…
Potterhead
  • 49
  • 1
  • 6
0
votes
1 answer

Prewitt filter, edge detection

I have this code that implements Prewitt edge detection. What I need to do is to implement it with only one buffer, meaning, I will not create copy of the image but edit original image. So if i want to change pixel with value 78, I cant put the new…
Torima
  • 157
  • 2
  • 13
0
votes
1 answer

bilateral filtering in image processing

Can anyone explain me how can I use the equation of bilateral filter in an image ,each coefficient in equation how can use it on an array and how the filter leave the edge without smoothing ? can anyone help me, please?and why(Ip - Iq) multiply in…
eleen
  • 191
  • 1
  • 4
  • 11
0
votes
1 answer

Matlab Edge Detection Function

I've got a task to create my own edge detection function using Matlab. But unfortunately, I've got no experience in image processing field, to the extent that I barely know how images are represented. Very little knowledge in this field. I've read…
PhilPecci
  • 1
  • 1
0
votes
1 answer

SQLITE Edge detection

I have a given SQLIt database (so no chance to do it in a better way): CREATE TABLE `history` ( `TIMESTAMP` TIMESTAMP, `DEVICE` `enter code here`varchar(32), `TYPE` varchar(32), `EVENT` varchar(512), `READING` varchar(32), …
Peter H
  • 23
  • 2
0
votes
0 answers

how to remove the non-static background from video stream?

I am working with OpenCV4Android version 3.0.0 and I am trying to remove background from video stream "non-static background". i want to do so because i have a problem when i try to detect the edges of a "card", the problem of detecting the edges of…
Amrmsmb
  • 1
  • 27
  • 104
  • 226
0
votes
1 answer

How to perfom horizontal rank filtering for edge detection?

I do some recognizing of plate numbers, but I'm stuck when doing extraction on them. I read references that state I have to perform horizontal rank filtering but I don't know how to do it. Code: a = imread('Izy.jpg'); b = imresize(a,0.5); c =…
Alfi Nugraha
  • 9
  • 5
0
votes
1 answer

Image Comparison Method and Noise deduction

I am currently doing a project of spotting fractured or bad products from a stream of product line. I am trying to use Opencv to extract the edges by Canny. Below are the edges attained from a bad product and a sample product…
Hiu leong Ng
  • 33
  • 8
1 2 3
…
70 71