# Questions tagged [hough-transform]

The tag has no usage guidance.

49 questions
Filter by
Sorted by
Tagged with
25 views

### Understanding rho and theta in hough

I understood the concept behind Hough transform. One thing i am still unsure is the rho and theta range of hough transform. The range is given below. If theta is in the range [0,pi), then rho values ...
55 views

### How to find position, scale and rotation of a known shape/contour in an image?

I have an image of an object. The image shows a high contrast outline of the object. It is guaranteed that the image shows exactly one object. The shape/contour of that outline is known. It is not ...
16 views

### Help understand the results of hough transform

I'm trying to apply the Hough transform of the following image using MATLAB: The result is: How could I predict that there are 6 bright spots in the resulted image? I expected 8 spots since I ...
23 views

### Detect circle using Hough transform

I am new to image processing and try to learn how to detect circles using the hough transform in Matlab. I have a shortcode that seems to contain no errors but when I run it I get the image but with ...
57 views

### MatLab-Finding error in hough line transform

Can I calculate the number of error in Hough Line Transform using MatLab? I did Hough Line Transform process from Canny Edge Detection, but it is unable to detect all the lines. Thanks.
297 views

### Hough Transform not working to recognize a line

I have an image composed of small white dots that should stay on the same line. I wanted to recognize this line using the Hough Transform. To do that I binarized the image, calculated the centroid of ...
163 views

### Understanding Houghlines command in Matlab

I created this picture with paint to understand the hough transform but i realized something funny by using houghlines(bw,theta,rho,peaks) in matlab. ...
323 views

### Fitting a grid to points in a 2d space

I have this problem where I have multiple points in a 2D space. A subset of these points makes up a rectangular grid. Some points of the grid might be missing. The shape and number of points the grid ...
429 views

### How to segment multiple overlapping coins (ellipses)

I am doing a program that counts coins (and tells their value by their size) with OpenCV (C++). Let's say we have an image of some coins. If there is an overlap of two coins at the same time, it is ...
142 views

16k views

### Help understanding Hough transform

I'm trying to get a Hough transform to work in MATLAB, but I'm having problems. I have a really bad way of detecting peaks that needs to be fixed, but before that I need to be able to reverse the ...