LineSegmentCetector.lua

local cv = require 'cv'
require 'cv.highgui'
require 'cv.imgproc'
require 'cv.imgcodecs'
require 'image'

-- local image = cv.imread{arg[1] or 'demo/lena.jpg', cv.IMREAD_GRAYSCALE}
imgT = image.lena()
imgT = image.lena()
imgTg = imgT[2] -- convert to grayscale and remove the first dimension
imgTgB = (imgTg*255):byte()

-- imgCV = imgT:transpose(1,2):transpose(2,3):clone()

-- cv.imshow{"Lena", imgCV};

local detector = cv.LineSegmentDetector{}
local lines = detector:detect{imgTgB}
imgCV = detector:drawSegments{imgTgB, lines}

cv.imshow{"Detected lines", imgCV}
cv.waitKey{0}