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2020-06-14 03:28:30 -0600
| asked a question | Comparing F matrix and E Matrix Comparing F matrix and E Matrix
I am doing the following:
cv::Mat E = cv::findEssentialMat(points1, points2, camera_mat |
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2020-06-04 06:54:00 -0600
| asked a question | Composing multiple Fundamental/Essential matrices Composing multiple Fundamental/Essential matrices
I have computed the fundamental matrices between Frame [a,b], [b,c] an |
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2020-06-04 04:22:35 -0600
| asked a question | Fundamental matrix for tiny movements Fundamental matrix for tiny movements
I want to estimate the rotation between two consequences frames of an calibrated c |
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2020-04-04 04:40:51 -0600
| asked a question | Stable Translation from essential decomposition Stable Translation from essential decomposition
When implementing monocular SLAM or Structure from Motion using single c |
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2019-10-04 06:35:32 -0600
| asked a question | OpenCV parallel_for_ splits ranges for single item OpenCV parallel_for_ splits ranges for single item
I am running this tutorial example:
int mandelbrot(const std::comple |
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2019-09-30 04:09:41 -0600
| received badge | ● Popular Question
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2019-07-13 07:26:27 -0600
| received badge | ● Notable Question
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2018-06-28 15:15:13 -0600
| received badge | ● Popular Question
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2017-12-08 14:29:58 -0600
| commented question | Build OpenCV with specific version of flann Thanks for reply. Yes that what happened to me. I end up building OpenCV without FLANN since I think that I am not using |
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2017-12-08 14:28:12 -0600
| commented question | Different point clouds when using cv::stereoRectify Thanks guys,
I will edit the post to clarify it more. However, I did not use any depth algorithm. I just picked up some |
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2017-12-07 19:17:33 -0600
| asked a question | Different point clouds when using cv::stereoRectify Different point clouds when using cv::stereoRectify
I have an well-calibrated stereo camera. I did an experiment where i |
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2017-12-07 19:04:38 -0600
| asked a question | does recoverPose() return up-to-scale or correct translation? does recoverPose() return up-to-scale or correct translation?
The function recoverPose() returns the rotation and transl |
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2017-12-06 14:35:36 -0600
| asked a question | Build OpenCV with specific version of flann Build OpenCV with specific version of flann
Can I specify a specific .lib file of Flann while building OpenCV?
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2017-12-06 12:52:53 -0600
| marked best answer | use of CALIB_RATIONAL_MODEL When exactly should I use CALIB_RATIONAL_MODEL flag for camera calibration? How should I know that my lens has this kind of distortion? |
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2017-12-05 19:17:45 -0600
| asked a question | use of CALIB_RATIONAL_MODEL use of CALIB_RATIONAL_MODEL
When exactly should I use CALIB_RATIONAL_MODEL flag for camera calibration? How should I kno |
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2017-11-23 09:40:14 -0600
| commented question | Multi camera calibration with chess board @berak. Thanks. Actually, no. This example does not fuse the data together and perform a global optimization. It just ca |
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2017-11-22 17:39:54 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
Is it possible to use multi camera calibration module (cv::multicalib) with ch |
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2017-11-22 17:39:46 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
Is it possible to use multi camera calibration module (cv::multicalib) with ch |
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2017-11-22 17:39:25 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
is it possible to use multi camera calibration module with chess board instead |
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2017-11-22 17:39:21 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
is it possible to use multi camera calibration module with chess board instead |
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2017-11-22 17:39:19 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
is it possible to use multi camera calibration module with chess board instead |
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2017-11-22 17:38:53 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
is it possible to use multi camera calibration module with chess board instead |
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2017-11-22 17:38:50 -0600
| asked a question | Multi camera calibration with chess board Multi camera calibration with chess board
is it possible to use multi camera calibration module with chess board instead |
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2017-11-01 11:59:20 -0600
| asked a question | Th results of decomposeHomographyMat meaning Th results of decomposeHomographyMat meaning
I have single calibrated RGB camera that is moving around a static object. |
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2017-07-09 17:17:12 -0600
| commented answer | calibrate stereo system without calling cv::stereoCalibrate Thank you very much for the answer. As I have understand the final C_T_P matrix contains the rotation matrix and translation vector. Is it correct? because I applied your answer but did not get correct results and I want to make sure that I understand correctly. (Most probably my implementation has some bugs but I want to make sure that I understand correctly first). |
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2017-07-08 19:32:48 -0600
| commented question | invalid option, /FIC @LBreger, Bulding without precompiled headers solved the problem. However, I could not mange to do it without this option. thank you very much |
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2017-07-08 19:30:13 -0600
| asked a question | calibrate stereo system without calling cv::stereoCalibrate I saw a program to calibrate a stereo system (Camera-projector pair). The output of the program is : - camera intrinsic matrix
- camera distortion coefficients
- camera extrinsic vectors (Obtained by
rvecs and tvecs of cv::calibrateCamera) - projector intrinsic matrix
- projector distortion coefficients
- projector extrinsic vectors (Obtained by
rvecs and tvecs of cv::calibrateCamera) I digged into the code and there was no calling for cv::stereoCalibrate. However, the program uses those 6 outputs to scan 3D objects successfully (the source of the scanning is closed, I have just the calibration part). How is this possible? How can I achieve rotation matrix and translation vector in order to get the essential matrix from rvecs and tvecs ? What I missing here? |
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2017-07-02 16:27:15 -0600
| asked a question | invalid option, /FIC I am trying to build OpenCV 3.2 using Visual studio 2017 comminuty edition.
I am building without CUDA and all other options are kept as default. I am getting this error while bulding: Severity Code Description Project File Line Suppression State
Error RC1103 invalid option, /FIC:/opencv/modules/videostab/src/precomp.hpp opencv_videostab C:\opencv\_build\modules\videostab\RC 1
It is also happens in other modules. BTW during Cmake stage I got this warnings: CMake Deprecation Warning at CMakeLists.txt:81 (cmake_policy):
The OLD behavior for policy CMP0020 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
CMake Deprecation Warning at CMakeLists.txt:85 (cmake_policy):
The OLD behavior for policy CMP0022 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
CMake Deprecation Warning at CMakeLists.txt:94 (cmake_policy):
The OLD behavior for policy CMP0026 will be removed from a future version
of CMake.
The cmake-policies(7) manual explains that the OLD behaviors of all
policies are deprecated and that a policy should be set to OLD only under
specific short-term circumstances. Projects should be ported to the NEW
behavior and not rely on setting a policy to OLD.
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2017-02-28 07:44:15 -0600
| commented question | hierarchicalClustering with custom distance @berak, yup I saw it and that what makes me ask here :D. Thank you for your time :) |
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2017-02-28 01:06:48 -0600
| commented question | hierarchicalClustering with custom distance @berak yes. but my question about how the distance function should be declared |
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2017-02-27 07:57:07 -0600
| asked a question | hierarchicalClustering with custom distance How can use cv::hierarchicalClustering with custom distance? how should the operator declaration should be? for example if I have 2D dataset, I want something like this: [](auto l, auto r){
return l[0]*r[0]+l[1]r[1];
}
How can I prepare it to be passed to cv::hierarchicalClustering |
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2017-02-10 12:47:40 -0600
| marked best answer | How can I link with native OpenCV in Android studio In Android Studio, how Can I link my android project (NDK) with OpenCV without linking any java modules. In other words, I want to use opencv from C++ code without exposing it to the java interface. How can I do this? |
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2017-02-08 00:33:46 -0600
| commented question | Reading 8-bit JPEG in OpenCV Thank you very much. Yes you are totally right it a GIF not a JPEG and that is why I am getting problem.. Thanks again |
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2017-02-07 11:54:53 -0600
| commented question | Reading 8-bit JPEG in OpenCV You should download it via the download button not saving it as image.. I have just tried to download it and I got JPEG file with 8 bit depth |
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2017-02-07 07:46:52 -0600
| asked a question | Reading 8-bit JPEG in OpenCV I have 8-bit colorful JPEG image that Windows Image Viewer can show it correctly. I tried to read it from OpenCV but it failed (returns empty cv::Mat). This is the reading code: auto img= cv::imread("c:/1.jpg"); // I tried also with cv::IMREAD_ANYDEPTH
//img.empty() == true
cv::imshow("img", img);
cv::waitKey();
JPEG file properties: 
What did I miss? Edit (Build Info): General configuration for OpenCV 3.1.0 =====================================
Version control: 1.4.79-1573-gc6780c3-dirty
Platform:
Host: Windows 10.0.10586 AMD64
CMake: 3.4.2
CMake generator: Visual Studio 12 2013 Win64
CMake build tool: C:/Program Files (x86)/MSBuild/12.0/bin/MSBuild.exe
MSVC: 1800
C/C++:
Built as dynamic libs?: NO
C++ Compiler: C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin/x86_amd64/cl.exe (ver 18.0.40629.0)
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 12.0/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 ZLIB::zlib JPEG::jpeg PNG::png vfw32
3rdparty dependencies: libwebp libjasper IlmImf libprotobuf ippicv
OpenCV modules:
To be built: core flann imgproc ml photo reg surface_matching video dnn fuzzy imgcodecs shape videoio highgui objdetect plot superres xobjdetect xphoto bgsegm bioinspired dpm face features2d line_descriptor saliency text calib3d ccalib datasets rgbd stereo structured_light tracking videostab xfeatures2d ximgproc aruco optflow stitching
Disabled: java world contrib_world
Disabled by dependency: -
Unavailable: cudaarithm cudabgsegm cudacodec cudafeatures2d cudafilters cudaimgproc cudalegacy cudaobjdetect cudaoptflow cudastereo cudawarping cudev python2 python3 ts viz cvv hdf matlab sfm
Windows RT support: NO
GUI:
QT: NO
Win32 UI: YES
OpenGL support: NO
VTK support: NO
Media I/O:
ZLib: ZLIB::zlib (ver 1.2.8)
JPEG: JPEG::jpeg (ver 90)
WEBP: build (ver 0.3.1)
PNG: PNG::png (ver ..)
TIFF: NO
JPEG 2000: build (ver 1.900.1)
OpenEXR: build (ver 1.7.1)
GDAL: NO
Video I/O:
Video for Windows: YES
DC1394 1.x: NO
DC1394 2.x: NO
FFMPEG: NO
codec: NO
format: NO
util: NO
swscale: NO
resample: NO
gentoo-style: NO
GStreamer: NO
OpenNI: NO
OpenNI PrimeSensor Modules: NO
OpenNI2: NO
PvAPI: NO
GigEVisionSDK: NO
DirectShow: YES
Media Foundation: NO
XIMEA: NO
Intel PerC: NO
Parallel framework: Concurrency
Other third-party libraries:
Use IPP: 9.0.1 [9.0.1]
at: D:/hunter/_Base/xxxxxxx/1fbd0c5/1378dcd/Build/OpenCV ...
(more) |
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2016-12-28 01:13:55 -0600
| commented answer | OpenCL can not detect my nVidia GPU via OpenCV @Papan: add this to environment variables OPENCV_OPENCL_DEVICE=NVIDIA:GPU: |
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2016-12-27 01:44:11 -0600
| marked best answer | OpenCL can not detect my nVidia GPU via OpenCV I have two GPUs : Intel HD and nVidia Quadro. Using GPU Caps Viewer, I can detect my both GPUs in the OpenCL tab. However, by executing this code I am only getting the Intel one: cv::ocl::setUseOpenCL(true);
if (!cv::ocl::haveOpenCL()) {
std::cout << "OpenCL is not available..." << std::endl;
}
cv::ocl::Context context;
if (!context.create(cv::ocl::Device::TYPE_ALL)) {
std::cout << "Failed creating the context..." << std::endl;
}
std::cout << context.ndevices() << " GPU devices are detected." << std::endl;
for (int i = 0; i < context.ndevices(); i++) {
cv::ocl::Device device = context.device(i);
std::cout << "name: " << device.name() << std::endl;
std::cout << "available: " << device.available() << std::endl;
std::cout << "imageSupport: " << device.imageSupport() << std::endl;
std::cout << "OpenCL_C_Version: " << device.OpenCL_C_Version() << std::endl;
std::cout << std::endl;
}
Results: 1 GPU devices are detected.
name: Intel(R) HD Graphics P530
available: 1
imageSupport: 1
OpenCL_C_Version: OpenCL C 2.0
Information: - Windows 10
- OpenCV 3.1
- Visual studio 2013
- nVidia Quadro M4000M
Notes: - I am able to call my nVidia GPU directly using the OpenCV Cuda Interface
- I have just installed the latest driver from nVidia website.
|
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2016-12-10 12:11:33 -0600
| commented question | access violation in copyTo Thanks for reply.. I tired sth similar..I create a matheader and allocate the memory then tried to use copyto.. till now no crash but I can no be positive since sometimes it took 1 hour till crashing.. anyway.. there is no much thing to show.. a simple clone method is causing the problem.. it is the first statement after reading from ipcamera and it work for long time before crashing... :/ |
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2016-12-10 10:57:12 -0600
| asked a question | access violation in copyTo I am reading an image from IPCamera (using VLC API). I store this image in cv::Mat called ipCameraImage. Then I am doing deep-copy for this Mat into another Mat using: auto frame=ipCameraImage.clone();
Everything seems fine. However, after around 1 hour of successful streaming, I got error access violation in the cloning process exactly inside copyTo function.. at the line: memcpy( dptr, sptr, len );
It says that dptr point to NULL ! I am sure that ipCameraImageis not empty and it is contains valid image (I debug it and show it using ImageWatch tool with VS.NET). It seems like a bug for me.. is it? Any suggestion? |
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2016-12-07 01:10:18 -0600
| commented question | Can not find Java folder in OpenCV build @berak.. it failed when compiling :/ I thought that it was solved when cmake operation succeeded. I have edited with the cmake output. many thanks |
|
2016-12-07 01:09:04 -0600
| edited question | Can not find Java folder in OpenCV build I have built OpenCV for android on Windows using CMAKE, MINGW and NVIDIA Android NDK.
After I make it and make install it, I found the following folders: install:
-apk:
-sdk:
--etc
--native
there is no java folder inside the sdk folder. libopencv_java3.so is also mssing. What did I miss? EDIT (CMake output): Detected version of GNU GCC: 49 (409)
FP16: Compiler support is available
Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
To enable PlantUML support, set PLANTUML_JAR environment variable or pass -DPLANTUML_JAR=<filepath> option to cmake
Could NOT find PythonInterp: Found unsuitable version "2.7.13", but required is at least "3.4" (found C:/Python27/python.exe)
Could NOT find PythonInterp: Found unsuitable version "2.7.13", but required is at least "3.2" (found C:/Python27/python.exe)
Found apache ant 1.8.2: C:/NVPACK/apache-ant-1.8.2/bin/ant.bat
Assume that non-module dependency is available: z (for module opencv_core)
[OpenCV for Android SDK]: A new OpenGL Camera Bridge (CameraGLSurfaceView, CameraGLRendererBase, CameraRenderer, Camera2Renderer) is disabled, because ANDROID_SDK_TARGET (15) < 21
Sample example-tutorial-4-opencl is disabled, because ANDROID_OPENCL_SDK is not specified
General configuration for OpenCV 3.1.0-dev =====================================
Version control: 3.1.0-1661-gacaa1e1
Platform:
Timestamp: 2016-12-06T13:36:05Z
Host: Windows 10.0.10586 AMD64
Target: Android 1 armv7-a
CMake: 3.4.2
CMake generator: Unix Makefiles
CMake build tool: C:/PROGRA~2/GnuWin32/bin/make.exe
Configuration: Release
C/C++:
Built as dynamic libs?: NO
C++ Compiler: C:/NVPACK/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-g++.exe (ver 4.9)
C++ flags (Release): -fexceptions -frtti -fpic -Wno-psabi --sysroot=C:/NVPACK/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -mfpu=neon -fvisibility=hidden -fvisibility-inlines-hidden -mfpu=neon-fp16 -mthumb -fomit-frame-pointer -fno-strict-aliasing -O3 -DNDEBUG -DNDEBUG
C++ flags (Debug): -fexceptions -frtti -fpic -Wno-psabi --sysroot=C:/NVPACK/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wundef -Winit-self -Wpointer-arith -Wshadow -Wsign-promo -Wno-narrowing -Wno-delete-non-virtual-dtor -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -mfpu=neon -fvisibility=hidden -fvisibility-inlines-hidden -mfpu=neon-fp16 -marm -fno-omit-frame-pointer -fno-strict-aliasing -O0 -g -DDEBUG -D_DEBUG -O0 -DDEBUG -D_DEBUG
C Compiler: C:/NVPACK/android-ndk-r12b/toolchains/arm-linux-androideabi-4.9/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc.exe
C flags (Release): -fexceptions -fpic -Wno-psabi --sysroot=C:/NVPACK/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections -ffunction-sections -Wa,--noexecstack -fsigned-char -W -Wall -Werror=return-type -Werror=non-virtual-dtor -Werror=address -Werror=sequence-point -Wformat -Werror=format-security -Wmissing-declarations -Wmissing-prototypes -Wstrict-prototypes -Wundef -Winit-self -Wpointer-arith -Wshadow -Wno-narrowing -Wno-comment -fdiagnostics-show-option -fomit-frame-pointer -mfp16-format=ieee -mfpu=neon -fvisibility=hidden -mfpu=neon-fp16 -mthumb -fomit-frame-pointer -fno-strict-aliasing -O3 -DNDEBUG -DNDEBUG
C flags (Debug): -fexceptions -fpic -Wno-psabi --sysroot=C:/NVPACK/android-ndk-r12b/platforms/android-9/arch-arm -funwind-tables -finline-limit=64 -fsigned-char -no-canonical-prefixes -march=armv7-a -mfloat-abi=softfp -mfpu=neon -fdata-sections ...
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