Hough transform

Hough transform is like a way to find things that are difficult to see directly. Imagine you have a bunch of dots on paper that look like a scribble. You can’t just say what shape it is by looking at it. But what if you connect the dots with lines and make a picture of just the lines? Now you can easily see what shape it is.

Hough transform works in a similar way. It’s a special method to find shapes in a picture no matter how they’re positioned or rotated. Let’s say you want to find all the circles in a picture of a bunch of dots. You draw a special grid on top of the picture, like a fishnet. Each square in the grid represents a possible circle. If there are dots inside a square, that means there could be a circle there. To see if there really is a circle, you draw a line through the center of the square and see if it passes through any dots. If it does, that means there is a circle there!

It’s basically like playing connect-the-dots, but with a lot of dots and more lines. With Hough transform you can find all sorts of shapes, like straight lines, curves, and even more complicated shapes. It’s like magic because even if the shape is covered up or distorted, Hough transform can still find it.