Implementation has been removed due to original code license issues about opencv-document-scanner HOT 12 OPEN

It work with opencv-python version 4.1.1.26 too.

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I had the same issue with opencv-contrib-python==4.1.1.26 and opencv-python==4.1.1.26.
The solutions I ended to are:

• Downgrade to opencv-contrib-python==4.0.0.21 and opencv-python==4.0.0.21.

• According to this question on Stakoverflow, to replace the missing LineSegmentDetectorImpl, install pylsd using pip install pylsd. For more details about how to use it with opencv, please check the documentation.

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It looks like LSD detector had been removed completely from the source tree since 4.1.0 release (see opencv/opencv@3ba49cc) =(

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@akkitech @AchuThanFinstreet @barabanus I have solved my problem with the following solution :
#include <opencv2/ximgproc.hpp>
#include <opencv2/line_descriptor/descriptor.hpp>
using namespace cv::ximgproc;
{
...
vector lines;
Ptr<cv::ximgproc::FastLineDetector> detector = cv::ximgproc::createFastLineDetector();
detector->detect(roi, lines);
}
I have test it succeessfully.BTW,LSD detector has not been removed from opencv 4.10 but removed to cv::ximgproc from cv !

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I suggest you all add a thumbs-up to this issue!
"Restore LineSegmentDetector LSD & avoid license conflict": #2524

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After uninstalling current opencv-version and reinstalling old one (3.1.0.0) it works now without this error.

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Thanks, @tangjie77wd, but it seems like it was removed completely from OpenCV 4.1.0 (see opencv/opencv@3ba49cc). I have found LSD line detector classes within contrib line_descriptor module, but if you try to call real detect() method the program will be terminated with "unimplemented" error. You use FastLineDetector, but it's not LSD: it's based on Canny edges detector (see http://vision.ucsd.edu/~jwlim/files/icra14linerec.pdf)

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I got the same issue. Some solution here?

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I got the same issue even if i choosed 'OPENCV_ENABLE_NONFEE' ! Someone told me his solution----re-run CMAKE with WITH_WIN32UI, since you are on Windows, and eventually with WITH_QT.

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@barabanus Opencv shows an example https://docs.opencv.org/4.1.0/d1/d9e/fld_lines_8cpp-example.html which supports both LSD and FastLineDetector.How could they draw lines in the example if they did not imcomplete LSD ?
`// Because of some CPU's power strategy, it seems that the first running of
// an algorithm takes much longer. So here we run both of the algorithmes 10
// times to see each algorithm's processing time with sufficiently warmed-up
// CPU performance.
for(int run_count = 0; run_count < 10; run_count++) {
lines_lsd.clear();
int64 start_lsd = getTickCount();
lsd->detect(image, lines_lsd);
// Detect the lines with LSD
double freq = getTickFrequency();
double duration_ms_lsd = double(getTickCount() - start_lsd) * 1000 / freq;
std::cout << "Elapsed time for LSD: " << duration_ms_lsd << " ms." << std::endl;

    lines_fld.clear();
    int64 start = getTickCount();
    // Detect the lines with FLD
    fld->detect(image, lines_fld);
    double duration_ms = double(getTickCount() - start) * 1000 / freq;
    std::cout << "Ealpsed time for FLD " << duration_ms << " ms." << std::endl;
}
// Show found lines with LSD
Mat line_image_lsd(image);
lsd->drawSegments(line_image_lsd, lines_lsd);
imshow("LSD result", line_image_lsd);

// Show found lines with FLD
Mat line_image_fld(image);
fld->drawSegments(line_image_fld, lines_fld);
imshow("FLD result", line_image_fld);

`
Well ,I will try once i am free. Maybe we can not use LSD but FLD in the future.

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After uninstalling current opencv-version and reinstalling old one (3.1.0.0) it works now without this error.

this is works to me. thanks!

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Same issue here on Ubuntu 19.04.

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