After using the detectTextSWT function, the program crashes

[Mahdi]

problem : hi, why After using the detectTextSWT function, the program crashes? Where am I wrong?

my codes :

// read image
cv::Mat imageInputBgr = OpenImage("imageInputBgr", cv::ImreadModes::IMREAD_COLOR); // read as 3-channel-BGR
if (imageInputBgr.empty())
{
	qDebug() << "Could not load the image file";
	return;
}


cv::Mat imageOutputBgr1 = imageInputBgr.clone();
std::vector<cv::Rect> components;
bool dark_on_light = false;
cv::Mat out;
std::vector<cv::Rect> regions;
cv::text::detectTextSWT(imageOutputBgr1, components, dark_on_light, out, regions);


return;


// other codes
// .
// .
// .

Application output :
12:21:02: The program has unexpectedly finished.
12:21:02: The process was ended forcefully.
12:21:02: C:\Users\mahdi\Documents\build-untitled-Desktop_Qt_5_12_11_MSVC2017_64bit-Debug\debug\untitled.exe crashed.

[berak]

similar :

Stroke Width Transform Unknown C++ Exception

Hi, I am trying to implement the new cv2.text.detectTextSWT() algorithm described here in the opencv docs: OpenCV: cv::text Namespace Reference, But I am seeing an error with the underlying C++ code. Here is my code (python): img = cv2.cvtColor(img, cv2.COLOR_BGR2RGB) rects, draw, chainBBs = cv2.text.detectTextSWT(img, True) for rect in rects: cv2.rectangle(vis, rect, (255, 255, 255), 2) cv2.imshow("", img) cv2.waitKey(0) And the error is: rects = cv2.text.detectTextSWT(vis, True) …

Stroke Width Transform Error

Hi, I’m using the SWT function inside an image preprocessing pipeline I have in Python, and I’m finding that it is throwing some strange errors. The crash code is: Unknown C++ Exception. I also posted about this a few weeks ago. When I input my images, if I have resized them more than around 2x, then it will crash maybe 1 in 5 times. If I don’t resize the images then it doesn’t seem to crash. It also seems to throw the error more often when the Dark_On_Light parameter is True while the actual i…

(probably not your fault, but a bug)

[berak]

can you add the image, please ?

[Mahdi]

yes sure, for example this image :

or

[Mahdi]

Test1

cv::Mat imageOutputBgr1 = imageInputBgr.clone();
std::vector<cv::Rect> components;
bool dark_on_light = false;
cv::Mat out;
std::vector<cv::Rect> regions;
cv::text::detectTextSWT(imageOutputBgr1, components, dark_on_light, out, regions);
//---
// Show Result
AddImage(out, "Letter Candidates");

I tested with the image above, When the value of the variable [dark_on_light] is false, I have no problem and no error occurs! BUT!!! When the value of the variable [dark_on_light] is true, it shows the following errors [ WHY??? ] :

OpenCV(4.5.4) Error: Assertion failed (channels() == CV_MAT_CN(dtype)) in cv::Mat::copyTo, file F:…\4.5.4\opencv\modules\core\src\copy.cpp, line 320

OpenCV: terminate handler is called! The last OpenCV error is:

OpenCV(4.5.4) Error: Assertion failed (channels() == CV_MAT_CN(dtype)) in cv::Mat::copyTo, file F:…\4.5.4\opencv\modules\core\src\copy.cpp, line 320

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Test2

when use this image, app crash [ dark_on_light == true /// and /// dark_on_light == false, in both, app crash ]

error message :

18:12:49: The program has unexpectedly finished.
18:12:49: The process was ended forcefully.
18:12:49: C:…\build-untitled-Desktop_Qt_5_12_11_MSVC2017_64bit-Debug\debug\untitled.exe crashed.

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Test3

dark_on_light == true ::: no error, no crash, show best result
dark_on_light == false ::: no error, no crash, The output is not the same as the previous test and is poor.

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[berak]

@Mahdi

When the value of the variable [dark_on_light] is true, it shows the following errors [ WHY??? ] :

OpenCV(4.5.4) Error: Assertion failed (channels() == CV_MAT_CN(dtype)) in cv::Mat::copyTo, file F:…\4.5.4\opencv\modules\core\src\copy.cpp, line 320

outTextRegions is empty here:

opencv/opencv_contrib/blob/4.x/modules/text/src/text_detector_swt.cpp#L850

i think it must be checked (bug)