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2019-10-10 18:32:26 -0600	received badge	● Student (source)
2016-02-05 10:12:58 -0600	received badge	● Popular Question (source)
2014-11-03 07:24:36 -0600	received badge	● Critic (source)
2014-10-29 09:48:38 -0600	commented question	Antialiased polygon fill doesn't respect area borders 1) Yes, I run debug version, should it be any difference? 2) I don't understand your item "2": of course I set 4th parameter of cv::fillPoly(...) to 1, not to 0, because the documentation says: "ncontours – Number of contours that bind the filled region", and I have ONE contour, not ZERO contours. 3) I removed ".5" from all the coordinates: cv::Point2f A(5,2), B(6, 2), C(6,3), D(5, 3); The result differs a bit, but still a very wrong one: 0, 10, 10, 0 // 10, 100, 100, 12 // 10, 85, 87, 12 // 0, 12, 12, 0 //
2014-10-29 07:13:33 -0600	commented question	Antialiased polygon fill doesn't respect area borders I updated the posting: without CV_AA flag I have 3 full (100%) pixels instead of expected four pixels at 25% each.
2014-10-29 05:14:41 -0600	asked a question	Antialiased polygon fill doesn't respect area borders I want to draw a quadrilateral which vertices doesn't coincide with pixel boundaries. The simplest case is a square with all 4 vertices located exactly in the middle of pixels. Here is my code doing it: `cv::Point2f A(5.5,2.5), B(6.5, 2.5), C(6.5,3.5), D(5.5, 3.5); cv::Point points[4] = {A, B, C, D}; const cv::Point *contours[1] = {points}; int lengths[1] = {4}; cv::Mat p(10, 10, CV_8U, cv::Scalar(0)); cv::fillPoly(p, contours, lengths, 1, cv::Scalar(100), CV_AA, 0); std::cout << p << std::endl;` In the output image I expected 4 pixels with the value of 25%, i.e. total value of 100 (because the area of the square is exactly 1). But the real output looks like this: `[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 19, 100, 22, 0, 0; 0, 0, 0, 0, 0, 36, 100, 40, 0, 0; 0, 0, 0, 0, 0, 20, 83, 22, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]` Is this a bug in the library or do I use it in a wrong way? And how to draw a simple 1x1 antialiased square? UPDATE: After removing CV_AA flag the output of `cv::fillPoly(p, contours, lengths, 1, cv::Scalar(100));` looks like this: `[ 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 100, 0, 0, 0; 0, 0, 0, 0, 0, 0, 100, 0, 0, 0; 0, 0, 0, 0, 0, 0, 100, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0; 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]`
2014-10-10 07:08:32 -0600	commented question	Crash: example from Cascade Classifier tutorial oh, I'm happy you're here, I know your name from git commit history for the doc file. "image" is okay (but "image" is not the issue, it crashes when tries to find eyes in "face_region" after line 28) Alas, checking any of "image" or "face_region" doesn't help: both are correct images (I used the gui to output them both, I see the full image for "image" and just the black white face for "face_region")
2014-10-10 06:09:58 -0600	received badge	● Editor (source)
2014-10-10 06:08:37 -0600	asked a question	Crash: example from Cascade Classifier tutorial I try to run the example program from here (tutorial for Cascade Classifier). In order to run the face/eyes classifiers on set of existing photos I changed the code and made a minimal crashing example. If I execute the program without eye recognition, it runs successfully and detects faces: `face detector: 1 face(s) detected in collection/image_case_001.png face detector: 3 face(s) detected in collection/image_case_002.png face detector: 5 face(s) detected in collection/image_case_003.png face detector: 1 face(s) detected in collection/image_case_004.png ..... etc ...... 171 images processed` As soon as I call it with "-eyes" flag it crashes in detectMultiScale call when trying to find eyes in a successfully detected face: `face detector: 1 face(s) detected in collection/image_case_001.png now detecting eyes for the face[0]=564x564+422+442... Segmentation fault` The same happens if I try any of my images instead of the first one, so I believe something is wrong with the program, while data is okay. I'm using opencv from git repo, last commit is "7e8846b81e420b 2014-09-30 13:39" on Debian Linux (testing distro). Here is my program (very short, just 36 lines) 1 #include <iostream> 2 #include <opencv/cv.hpp> 3 #include <opencv/highgui.h> 4 #include <opencv2/objdetect/objdetect.hpp> 5 #include <opencv2/objdetect/detection_based_tracker.hpp> 6 int main(int argc, char **argv) 7 { 8 cv::CascadeClassifier face_classifier, eyes_classifier; 9 if (not face_classifier.load("haarcascade_frontalface_alt.xml") or not eyes_classifier.load("haarcascade_eye_tree_eyeglasses.xml")) 10 { 11 std::cerr << "sorry, can't load XML files" << std::endl; 12 return 1; 13 } 14 for (int no=1; no<=171; ++no) 15 { 16 char path[1024]; 17 sprintf(path, "collection/image_case_%03d.png", no); 18 std::vector<cv::Rect> faces; 19 cv::Mat gray, image = cv::imread(path, CV_LOAD_IMAGE_COLOR); 20 cv::cvtColor(image, gray, CV_BGRA2GRAY); 21 cv::equalizeHist(gray, gray); 22 face_classifier.detectMultiScale (gray, faces, 1.1, 2, 0\|CV_HAAR_SCALE_IMAGE, cv::Size(30, 30)); 23 std::cout << "face detector: " << faces.size() << " face(s) detected in " << path << std::endl; 24 if (argc > 1 and (std::string) argv[1]=="-eyes") // eyes requested on command line 25 for (unsigned i=0; i < faces.size(); ++i) 26 { 27 std::vector<cv::Rect> eyes; 28 cv::Mat face_region = gray(faces[i]); 29 std::cout << "now detecting eyes for the face[" << i << "]=" 30 << faces[i].width << "x" << faces[i].height << "+" << faces[i].x << "+" << faces[i].y << "..." << std::endl; 31 eyes_classifier.detectMultiScale(face_region, eyes, 1.1, 2, 0 \|CV_HAAR_SCALE_IMAGE, cv::Size(30, 30)); 32 std::cout << "eyes detector: " << eyes.size() << " eye(s) detected in face[" << i << "]: " << std::endl; 33 } 34 } 35 return 0; 36 } And here is the stack dump printed by GDB: `gdb > run -eyes Starting program: /home/ilya/vision/./crash -eyes warning: no loadable sections found in added symbol-file system-supplied DSO at 0x7ffff7ffa000 warning: Could not load shared library symbols for linux-vdso.so.1. Do you need "set solib-search-path" or "set sysroot"? [Thread debugging using libthread_db enabled] Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so ...` (more)
2014-10-10 04:14:04 -0600	answered a question	Compiling errors (3.0.0-alpha / Master Head) on Linux A valid workaround is to disable "FFMPEG support" in CMakeLists.txt: diff --git a/CMakeLists.txt b/CMakeLists.txt index 5301f82..d5649b0 100644 --- a/CMakeLists.txt +++ b/CMakeLists.txt @@ -125,7 +125,7 @@ OCV_OPTION(WITH_CUBLAS "Include NVidia Cuda Basic Linear Algebra Subprog OCV_OPTION(WITH_NVCUVID "Include NVidia Video Decoding library support" OFF IF (NOT IOS AND NOT APPLE) ) OCV_OPTION(WITH_EIGEN "Include Eigen2/Eigen3 support" ON) OCV_OPTION(WITH_VFW "Include Video for Windows support" ON IF WIN32 ) -OCV_OPTION(WITH_FFMPEG "Include FFMPEG support" ON IF (NOT ANDROID AND NOT IOS)) +OCV_OPTION(WITH_FFMPEG "Include FFMPEG support" OFF IF (NOT ANDROID AND NOT IOS)) OCV_OPTION(WITH_GSTREAMER "Include Gstreamer support" ON IF (UNIX AND NOT APPLE AND NOT ANDROID) ) OCV_OPTION(WITH_GSTREAMER_0_10 "Enable Gstreamer 0.10 support (instead of 1.x)" OFF ) OCV_OPTION(WITH_GTK "Include GTK support" ON IF (UNIX AND NOT APPLE AND NOT ANDROID) )
2014-10-02 14:48:29 -0600	commented answer	Compiling errors (3.0.0-alpha / Master Head) on Linux I did it: installed the package libx264-dev, cleaned the working directory and run "cmake . && make" again. Alas, same error message...
2014-10-02 08:13:06 -0600	asked a question	Compiling errors (3.0.0-alpha / Master Head) on Linux I tried to compile opencv from sources: 1) first from the HEAD of master branch on github and then 2) from the zip file https://github.com/Itseez/opencv/archive/3.0.0-alpha.zip In both cases I got the same error message: Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_ffmpeg.cpp.o In file included from /home/ilya/opencv/modules/videoio/src/cap_ffmpeg_impl.hpp:65:0, from /home/ilya/opencv/modules/videoio/src/cap_ffmpeg.cpp:45: /home/ilya/opencv/modules/videoio/src/ffmpeg_codecs.hpp:98:7: error: ‘CODEC_ID_H264’ was not declared in this scope { CODEC_ID_H264, MKTAG('H', '2', '6', '4') }, I'm running Debian Testing distro, amd64 architecture. Any idea what's wrong?