ImageLines

ImageLines[image] finds line segments in image and returns the coordinates of their endpoints.

ImageLines[image, t] uses threshold t for selecting lines.

Examples

Detect lines in an image:

img = ExampleData[{"TestImage", "Lena"}];
lines = ImageLines[img];
HighlightImage[img, Line /@ lines]

With threshold:

ImageLines[img, 0.5]

Please visit the official Wolfram Language Reference for more details.