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2018-04-08 00:15:47 -0600 received badge ● Student (source)
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2015-07-27 02:38:08 -0600 commented answer CvType meaning

Same question here, where can I find a doc for all these constants? Such as CV_16SC3. I guess it means 16bit per channel, and is signed. But why signed?
2015-07-22 00:22:51 -0600 commented question imread always return empty matrix

I encountered the same issue. It turns out I should use the full path of the image file.
2015-07-22 00:22:41 -0600 commented question imread returning empty matrix in debug, double-checked that I have the correct libs

I encountered the same issue. It turns out I should use the full path of the image file.
2015-07-22 00:22:28 -0600 commented question problem with reading image to Mat

I encountered the same issue. It turns out I should use the full path of the image file.
2015-07-19 09:24:12 -0600 asked a question java.lang.UnsatisfiedLinkError when using binaries built from source.

I just built the opencv-300.jar and opencv_java300.dll from source with extra modules from the opencv contrib repo. I used the jar and dll in my Java project. But it reports the following error when I try to create the BRISK DescriptorExtractor.

Exception in thread "main" java.lang.UnsatisfiedLinkError: org.opencv.features2d.DescriptorExtractor.create_0(I)J
    at org.opencv.features2d.DescriptorExtractor.create_0(Native Method)
    at org.opencv.features2d.DescriptorExtractor.create(DescriptorExtractor.java:127)
    at mainPkg.MainApp.MatchExperiment(MainApp.java:54)
    at mainPkg.MainApp.main(MainApp.java:45)

***** VIDEOINPUT LIBRARY - 0.1995 - TFW07 *****

Based on my understanding of the UnsatisfiedLinkError, it seems the native method DescriptorExtractor.create_0() cannot be found.

Any hint is appreciated...

Add 1

Based on my limited JNI knowledge, I started to search for the JNI declarations in the source code of OpenCV extra modules. It is org.opencv.features2d.DescriptorExtractor missing. So I searched for Java_org_opencv_features2d_DescriptorExtractor. And just as expected, it is not found. So it is never exported as JNI. So I cross my fingers and start to recall... Based on my limited experience with Machine Learning, I remember the jargon feature is intimately related to it. And I remembered I glimpsed some ml in the CMake configuration for OpenCV. So I go through the configuration entries and found this:

BUILD_opencv_ml

And it is NOT selected.

So I checked it. And regenerated the VS project files. And this time I found the Java_org_opencv_features2d_DescriptorExtractor.

Now I am crossing my fingers again and waiting for the new build to complete... Hopefully, it will work...
2015-07-18 09:10:21 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak I just re-installed both python27 and python34. Seems some progress. I will be updating my post.
2015-07-18 08:36:29 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak yes, i can. it outputs 2.7.10 (default, May 23 2015, 09:40:32)
2015-07-18 06:48:12 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

Here's another link about python 1.4 issue: http://help.appveyor.com/discussions/...
2015-07-18 06:43:55 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

I am really curious about where it get the python 1.4 from.
2015-07-18 06:38:22 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak Strange. the one it found C:/Python/Python27/python.exeis indeed python 2.7. And here's an related link: http://answers.opencv.org/question/41...
2015-07-18 05:54:43 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak Yes sir. Full log just added.. ;)
2015-07-18 05:51:03 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak I added some log during generation.
2015-07-18 05:50:24 -0600 received badge ● Editor (source)
2015-07-18 05:18:14 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak I rebuild the INSTALL project. And totally 99 projects are successfully built. After build finished, I searched the build directory for opencv_java300.dll. But still no luck. I noticed there's something like opencv_ffmpeg300.dll. I recheck the configure entries in the cmake-gui, I see entries like WITH_FFMPEG. But I didn't see anything related to java. Could you shed some more light? Thx.
2015-07-18 02:47:52 -0600 commented question How to build the Java wrapper for OpenCV 3.0?

@berak Thanks for the hint. I re-configure the build process by unchecking the BUILD_SHARED_LIBS in cmake-gui, and rebuild the solution in visual studio 2013. But I didn't find a opencv_java300.dll generated. Could you provide more details?
2015-07-17 19:12:57 -0600 asked a question How to build the Java wrapper for OpenCV 3.0?

I am using OpenCV 3.0 in my Java application through the opencv-300.jar and opencv_java300.dll. They come with the standard installation. But some extra modules are not in the standard installation. So I build an OpenCV 3.0 with the opencv-contrib repo.

But the build generates about 40 binaries. How can I generate something like opencv-300.jar and opencv_java300.dll for Java adoption? Do I need to turn to SWIG or something?

ADD 1

I see the following log in the cmake-gui generation process:

  Java:
    ant:                         C:/apache-ant-1.9.4/bin/ant.bat (ver
1.9.4)
    JNI:                         C:/Java/jdk1.6.0_45_32bit/include C:/Java/jdk1.6.0_45_32bit/include/win32 C:/Java/jdk1.6.0_45_32bit/include
    Java wrappers:               NO
    Java tests:                  NO

Could this be the reason?

The complete log is below:

found IPP (ICV version): 8.2.1 [8.2.1]
at: E:/Softwares/OpenCV/OpenCV3.0.0/opencv/sources/3rdparty/ippicv/unpack/ippicv_win
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 "1.4", but required is at least "2.7" (found C:/Python/Python27/python.exe)
Could NOT find PythonInterp: Found unsuitable version "1.4", but required is at least "2.6" (found C:/Python/Python27/python.exe)
Could NOT find PythonInterp: Found unsuitable version "1.4", but required is at least "3.4" (found C:/Python/Python27/python.exe)
Could NOT find PythonInterp: Found unsuitable version "1.4", but required is at least "3.2" (found C:/Python/Python27/python.exe)
Picked up _JAVA_OPTIONS: -Djava.net.preferIPv4Stack=true

Found apache ant 1.9.4: C:/apache-ant-1.9.4/bin/ant.bat
ERROR: 
The system was unable to find the specified registry key or value.

ERROR: 
The system was unable to find the specified registry key or value.

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
Tesseract:   NO
  videoio: Removing WinRT API headers by default
Tesseract:   NO

General configuration for OpenCV 3.0.0 =====================================
  Version control:               unknown

  Platform:
    Host:                        Windows 6.1 AMD64
    CMake:                       3.1.3
    CMake generator:             Visual Studio 12 2013
    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/cl.exe  (ver 18.0.31101.0)
    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 /arch:SSE2 /Oi /fp:fast  /wd4251 /wd4324 /MP4  /MT /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 /arch:SSE2 /Oi /fp:fast  /wd4251 /wd4324 /MP4  /D_DEBUG /MTd /Zi /Ob0 /Od /RTC1 
    C Compiler:                  C:/Program Files (x86)/Microsoft Visual Studio 12.0/VC/bin ...
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2015-07-16 23:59:33 -0600 asked a question Can OpenCV do these processing?

I am working on an OCR project. I need to do some pre-processing similar to the link below: http://cn.mathworks.com/help/vision/e...

The steps are:

  • Region detection (MSER)
  • Edge detection (Canny)
  • Connected Component Analysis (for character candidates filtering)

I am not familiar with OpenCV. I am wondering if OpenCV can do all of these.
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