Hough transform angle detection

1. How does Hough transform detect lines?
2. Can Hough transform detect curved lines?
3. What does a Hough transform do?
4. What is theta in Hough transform?

How does Hough transform detect lines?

If two edge points lay on the same line, their corresponding cosine curves will intersect each other on a specific (ρ, θ) pair. Thus, the Hough Transform algorithm detects lines by finding the (ρ, θ) pairs that have a number of intersections larger than a certain threshold.

Can Hough transform detect curved lines?

The Hough Transform (HT) is a popular technique for detecting straight lines and curves on gray-scale images. It maps image data from image space to a parameter space, where curve detection becomes peak detection problem.

What does a Hough transform do?

The Hough transform is a popular feature extraction technique that converts an image from Cartesian to polar coordinates. Any point within the image space is represented by a sinusoidal curve in the Hough space.

What is theta in Hough transform?

The function uses the parametric representation of a line: rho = x*cos(theta) + y*sin(theta) . The function returns rho , the distance from the origin to the line along a vector perpendicular to the line, and theta , the angle in degrees between the x-axis and this vector.