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 2020-12-14 03:20:39 -0500 received badge ● Famous Question (source) 2020-11-15 01:30:03 -0500 marked best answer How to use InRange at Different Color Space and Range. Hi all, how to use InRange at different color space and Range. for example:in RGB space, 0<=R,G,B<=255, so,it's very easy to use: inRange(const MatND& src, const Scalar& lowerb, const Scalar& upperb, MatND& dst)  But if i want the range out of the lowerb & upperb, for example: I want R color Range: 0<=R<=20, 100<=R<=255. like Aforge Color Filtering as picture. Also, in the other color space how to use InRange where the parameters out of the range. Thanks:) 2020-10-24 06:39:09 -0500 received badge ● Good Answer (source) 2020-10-24 06:39:09 -0500 received badge ● Nice Answer (source) 2020-06-25 13:56:20 -0500 received badge ● Taxonomist 2020-04-13 17:08:49 -0500 received badge ● Popular Question (source) 2020-02-25 01:04:13 -0500 received badge ● Popular Question (source) 2020-02-11 13:34:11 -0500 received badge ● Popular Question (source) 2020-02-11 13:34:11 -0500 received badge ● Notable Question (source) 2019-09-19 03:21:36 -0500 commented question discrete_fourier_transform sample error in opencv4.1.1 But I still find another question. The cols of the variable planes[0] is 75. Why? 2019-09-19 02:14:09 -0500 answered a question discrete_fourier_transform sample error in opencv4.1.1 Sorry, I find out another problem: In this image, the cols of padded[0] is 75. why? it should be 25 .Isn't? 2019-09-19 00:23:56 -0500 commented question discrete_fourier_transform sample error in opencv4.1.1 Hi, LBerger, I think i find out the problem. This code : Mat planes[] = { Mat_(padded), Mat::zeros(padded. 2019-09-18 04:19:34 -0500 asked a question discrete_fourier_transform sample error in opencv4.1.1 discrete_fourier_transform sample error in opencv4.1.1 Hi all: I find a error in sample code, I am not sure it's an err 2019-08-19 14:05:31 -0500 received badge ● Notable Question (source) 2019-06-10 19:51:03 -0500 edited answer cv::mat in mfc try list: int ShowMat( cv::Mat img, HWND hWndDisplay ) { if (img.channels()<3 ) { re 2019-06-10 19:35:03 -0500 edited answer cv::mat in mfc int ShowMat( cv::Mat img, HWND hWndDisplay ) { if (img.channels()<3 ) { return -1; } RECT rect; 2019-06-04 08:38:07 -0500 received badge ● Notable Question (source) 2019-05-22 19:34:45 -0500 commented question robust external contour detection? yes, try to use threshold and get blob.Finally you use boundingRect to find bounding. 2019-05-21 19:19:18 -0500 commented question robust external contour detection? try adaptivethreshold replace Canny. 2019-01-23 08:36:59 -0500 edited question Is bug or not in opencv3.4.4(findcontours)? Is bug or not in opencv3.4.4(findcontours)? Hi all. Long time no see, I try to rewrite sample code as below public: Sy 2019-01-23 08:27:28 -0500 asked a question Is bug or not in opencv3.4.4(findcontours)? Is bug or not in opencv3.4.4(findcontours)? Hi all. Long time no see, I try to rewrite sample code as below public: Sy 2019-01-15 00:47:22 -0500 received badge ● Notable Question (source) 2018-12-07 06:32:46 -0500 received badge ● Famous Question (source) 2018-10-02 08:27:39 -0500 commented question cv::String in example opencv_version Opencv 3.0 No,just do your best 2018-09-27 07:53:14 -0500 commented answer Having trouble with using Mat image in pictureBox of Visual C++ CLR project Sorry I delete some comment! 2018-09-27 07:52:51 -0500 edited answer Having trouble with using Mat image in pictureBox of Visual C++ CLR project Hi, here is the example code, but web is japan language http://imagingsolution.blog107.fc2.com/blog-entry-91.html if you 2018-08-08 05:33:23 -0500 received badge ● Popular Question (source) 2018-03-05 07:06:01 -0500 received badge ● Notable Question (source) 2017-10-07 09:23:53 -0500 received badge ● Popular Question (source) 2017-08-07 16:02:27 -0500 received badge ● Popular Question (source) 2017-07-10 16:41:39 -0500 marked best answer How to access pixels along a line or curve using opencv? Hi all, is any method to access pixels along a line or curve in opencv??? 2017-07-05 03:05:53 -0500 received badge ● Popular Question (source) 2017-03-03 14:44:33 -0500 received badge ● Popular Question (source) 2017-02-27 16:34:16 -0500 received badge ● Notable Question (source) 2017-02-08 20:09:44 -0500 received badge ● Famous Question (source) 2016-12-12 07:48:11 -0500 commented question CV_IPP_RUN no define when build opencv3.1.0 I found you should download from github. There is a bug in OpenCV V3.1.0. if you download from sourceforge! 2016-05-21 15:50:39 -0500 marked best answer How to create irregular ROI?? Hi all: How to use opencv to create irregular ROI? Like rotate rectangle, cycle , H,or T sharp ROI???? 2016-04-15 11:33:58 -0500 received badge ● Popular Question (source) 2016-03-13 00:22:17 -0500 asked a question CV_IPP_RUN no define when build opencv3.1.0 Hi all, I use cmake to config my system before build opencv3.1.0 source core. But when i open source code in vs2015. I find that "identifier CV_IPP_RUN not define". How to setup or config the environment? found IPP (ICV version): 9.0.1 [9.0.1] at: H:/opencv-3.1.0/opencv/sources/3rdparty/ippicv/unpack/ippicv_win CUDA detected: 7.5 CUDA NVCC target flags: -gencode;arch=compute_20,code=sm_20;-gencode;arch=compute_20,code=sm_21;-gencode;arch=compute_30,code=sm_30;-gencode;arch=compute_35,code=sm_35;-gencode;arch=compute_30,code=compute_30 To enable PlantUML support, set PLANTUML_JAR environment variable or pass -DPLANTUML_JAR= option to cmake Found PythonInterp: C:/Python27/python.exe (found suitable version "2.7.10", minimum required is "2.7") Traceback (most recent call last): File "", line 1, in ImportError: No module named numpy.distutils Found PythonInterp: C:/Python34/python.exe (found suitable version "3.4.3", minimum required is "3.4") Could NOT find PythonLibs (missing: PYTHON_LIBRARIES PYTHON_INCLUDE_DIRS) (Required is exact version "3.4.3") Traceback (most recent call last): File "", line 1, in ImportError: No module named 'numpy' Could NOT find Matlab (missing: MATLAB_MEX_SCRIPT MATLAB_INCLUDE_DIRS MATLAB_ROOT_DIR MATLAB_LIBRARIES MATLAB_LIBRARY_DIRS MATLAB_MEXEXT MATLAB_ARCH MATLAB_BIN) VTK is not found. Please set -DVTK_DIR in CMake to VTK build directory, or to VTK install subdirectory with VTKConfig.cmake file General configuration for OpenCV 3.1.0 ===================================== Version control: unknown Platform: Host: Windows 6.2 AMD64 CMake: 3.3.0-rc2 CMake generator: Visual Studio 14 2015 Win64 CMake build tool: C:/Program Files (x86)/MSBuild/14.0/bin/MSBuild.exe MSVC: 1900 C/C++: Built as dynamic libs?: YES C++ Compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/x86_amd64/cl.exe (ver 19.0.23506.0) C++ flags (Release): /DWIN32 /D_WINDOWS /W4 /GR /EHa /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /wd4251 /wd4324 /wd4275 /wd4589 /MP8 /MD /O2 /Ob2 /D NDEBUG /Zi C++ flags (Debug): /DWIN32 /D_WINDOWS /W4 /GR /EHa /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /wd4251 /wd4324 /wd4275 /wd4589 /MP8 /D_DEBUG /MDd /Zi /Ob0 /Od /RTC1 C Compiler: C:/Program Files (x86)/Microsoft Visual Studio 14.0/VC/bin/x86_amd64/cl.exe C flags (Release): /DWIN32 /D_WINDOWS /W3 /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /MP8 /MD /O2 /Ob2 /D NDEBUG /Zi C flags (Debug): /DWIN32 /D_WINDOWS /W3 /D _CRT_SECURE_NO_DEPRECATE /D _CRT_NONSTDC_NO_DEPRECATE /D _SCL_SECURE_NO_WARNINGS /Gy /bigobj /Oi /MP8 /D_DEBUG /MDd /Zi /Ob0 /Od /RTC1 Linker flags (Release): /machine:x64 /INCREMENTAL:NO /debug Linker flags (Debug): /machine:x64 /debug /INCREMENTAL Precompiled headers: YES Extra dependencies: comctl32 gdi32 ole32 setupapi ws2_32 vfw32 C:/Program Files/Allied Vision Technologies/GigESDK/lib-pc/x64/PvAPI.lib cudart nppc nppi npps cufft -LC:/Program Files/NVIDIA GPU Computing Toolkit/CUDA/v7.5/lib/x64 3rdparty dependencies: zlib libjpeg libwebp libpng libtiff libjasper IlmImf OpenCV modules: To be built: cudev core cudaarithm flann imgproc ml video cudabgsegm cudafilters cudaimgproc cudawarping imgcodecs photo shape videoio cudacodec highgui objdetect ts features2d calib3d cudafeatures2d cudalegacy ... 2016-03-03 10:14:56 -0500 commented question BaseRowFilter and BaseColumnFilter in opencv 3.x I am sorry that it is the same question:) 2016-02-23 21:01:26 -0500 received badge ● Notable Question (source) 2016-01-11 03:08:10 -0500 marked best answer The contours in drawcontours is closed or not? Hi all, this is my test picture: As i know, if want to calculate the area or others , the contours should be closed. But I test findcontours and drawcontours , i cann't verify. The following code is true or not. Thanks.  Mat temp,blob; blob=Mat::zeros(imgIn_height,imgIn_width,CV_8UC1); temp=Mat::zeros(imgIn_height,imgIn_width,CV_8UC1); cv::findContours(hole.clone(),contours,hierarchy, CV_RETR_TREE, CV_CHAIN_APPROX_SIMPLE); for(int idx=0; idx(p.y,p.x)=255; } A=cv::contourArea(contours[idx]); } imwrite("c:\\temp.bmp",temp);  Finally I get: ---->result.bmp --->Contours(temp.bmp) is not closed. 2015-12-31 00:49:05 -0500 received badge ● Famous Question (source) 2015-12-26 13:49:05 -0500 marked best answer How to faster sort matrix? I want to sort all element of mat but my kernel size(kernel_size=61) is very large. Now i use ///* For each window row */ for ( iwr = wr_begin; iwr < wr_end; iwr++ ) { /* For each window column */ memcpy(p+k*win_size,src2.data+(ic-c_begin)+(ir-r_begin+iwr-wr_begin)*num_cols,sizeof(win_size)); k+=1; } //cv::Rect roi(ic-c_begin,ir-r_begin,win_size,win_size); //Mat roi_image=src2(roi); //roi_image std::sort(p,p+win_count); median_value=p[pos] ;  Is any faster method?? pls tell me, thanks:) 2015-11-07 06:40:50 -0500 received badge ● Popular Question (source)