opencv 4.x 去除了lsd 模块

[lix19937]

在opencv 4.2.0.34版本下调用 lsd = cv2.createLineSegmentDetector(0) 运行报错

cv2.error: OpenCV(4.2.0) C:\Users\lix\AppData\Local\Temp\1\pip-req-build-wbmte9m7\opencv\modules\imgproc\src\lsd.cpp:143:   
error: (-213:The function/feature is not implemented) Implementation has been removed due original  
code license issues in function ‘cv::LineSegmentDetectorImpl::LineSegmentDetectorImpl’

报源码许可证问题而删除了实现

在opencv contrib扩展中的ximgproc模块中给出了一个LineSegmentDetector类，来替代LSD算法。

该算法来自于2014年ICRA的一篇论文《Outdoor place recognition in urban environments using straight lines》

ref https://blog.csdn.net/Zhaoxi_Li/article/details/106844821

[lix19937]

lsd

# coding=utf-8
import cv2
import numpy as np

img0 = cv2.imread("test3.jpg")
img = cv2.cvtColor(img0,cv2.COLOR_BGR2GRAY)

lsd = cv2.createLineSegmentDetector(0)

dlines = lsd.detect(img)

for dline in dlines[0]:
    x0 = int(round(dline[0][0]))
    y0 = int(round(dline[0][1]))
    x1 = int(round(dline[0][2]))
    y1 = int(round(dline[0][3]))
    cv2.line(img0, (x0, y0), (x1,y1), (0,255,0), 1, cv2.LINE_AA)

cv2.imwrite('test3_r.jpg', img0)
cv2.imshow("LSD", img0)
cv2.waitKey(0)
cv2.destroyAllWindows()

fsd

# coding=utf-8
import cv2
import numpy as np

img0 = cv2.imread("test3.jpg")
img = cv2.cvtColor(img0,cv2.COLOR_BGR2GRAY)

fld = cv2.ximgproc.createFastLineDetector()
dlines = fld.detect(img)

for dline in dlines:
    x0 = int(round(dline[0][0]))
    y0 = int(round(dline[0][1]))
    x1 = int(round(dline[0][2]))
    y1 = int(round(dline[0][3]))
    cv2.line(img0, (x0, y0), (x1,y1), (0,255,0), 1, cv2.LINE_AA)

cv2.imwrite('test3_r.jpg', img0)
cv2.imshow("LSD", img0)
cv2.waitKey(0)
cv2.destroyAllWindows()