dcv.features.rht

// Load an image from filesystem.
Image image = imread("/path/to/image.png");

// Calculate edges by use of canny algorithm
auto edges = image
                .sliced
                .rgb2gray
                .as!float
                .slice
                .conv(gaussian!float(1.0f, 3, 3))
                .canny!ubyte(100);

// Setup RHT line extraction context
auto lines = RhtLines().epouchs(50).iterations(250).minCurve(25);

// Lazily iterate and detect lines in pre-processed image
foreach(line; lines(edges)) {
    // do stuff with lines..
}

For more elaborated module description visit the RHT example.