peter_cz's profile - activity

How to use OpenCL cache clBuildProgram() can be slow, but its results are cached (by OpenCV and by some OpenCL implement

How to detect wourkgroup sized used? Hello, I am trying to understand more DNN module with OpenCL backend. It seems by

How to detect wourkgroup sized used? Hello, I am trying to understand more DNN module with OpenCL backend. It seems by

OPENCV_OCL4DNN_DISABLE_AUTO_TUNING Hello, I would like to use OPENCV_OCL4DNN_DISABLE_AUTO_TUNING option to tune opencl

OPENCV_OCL4DNN_DISABLE_AUTO_TUNING Hello, I would like to use OPENCV_OCL4DNN_DISABLE_AUTO_TUNING option to tune opencl

Can dnn module leverage on that (some speed-up) if used quantized model?

So what's benifit of that though?

OpenCV dnn import quantized model Is it possible to load NN quantized model of tensorflow? The nodes and weights of a n

OpenCV dnn import quantized model Is it possible to load NN quantized model of tensorflow? Ifso how? Thank you.

CL_INVALID_WORK_GROUP_SIZE I have short test program trying to use OpenCL version of functions ... cv::ocl::setUseOpenC

CL_INVALID_WORK_GROUP_SIZE I have short test program trying to use OpenCL version of functions ... cv::ocl::setUseOpenC

CL_INVALID_WORK_GROUP_SIZE I have short test program trying to use OpenCL version of functions ... cv::ocl::setUseOpenC

CL_INVALID_WORK_GROUP_SIZE I have short test program trying to use OpenCL version of functions ... cv::ocl::setUseOpenC

CL_INVALID_WORK_GROUP_SIZE I have short test program trying to use OpenCL version of functions ... cv::ocl::setUseOpenC

How to convert Mat <-> UMat back-and-forth I'd like to know how to convert UMat image onto Mat and back-and-forth.

How to convert Mat <-> UMat back-and-forth I'd like to know how to convert UMat image onto Mat and back-and-forth.

How to convert Mat <-> UMat back-and-forth I'd like to know how to convert UMat image onto Mat and back-and-forth.

How to convert Mat <-> UMat back-and-forth I'd like to know how to convert UMat image onto Mat and back-and-forth.

how about Eclipse?

OpenCV Development Enviroment I am looking for an advice how to effectivelly develop within OpenCV. How to setup develop

DNN Importer Are there any plans or actual use of Machinelareaning framerworks importer such as ONNX or NNEF?

Access HOG from within OpenVX framework

in my case I have HOGDescriptor d1(Size(512, 512), Size(16, 16), Size(16, 16), Size(16, 16), 9); by calling Mat r1 = g

have you got any cv knowledge yourself?

Hog compilation error Dears, I'm trying to understand HOG descriptor which I am using e.g. //extraction of HoG feature

Hi Steven, can I advice where to extract from?

Histogram of Oriented Gradients Hello, I'm looking for an example of Histogram of Oriented Gradients, is it implented w

Hello,

I'm trying to use Chapter4_StructureFromMotion example from https://github.com/MasteringOpenCV/code abd its book. I use now opencv 3.1.0 andby compiling that I got

/Chapter4_StructureFromMotion/GPUSURFFeatureMatcher.h:10:31: fatal error: opencv2/gpu/gpu.hpp: No such file or directory

How to port it to newer version of opencv, particularly for gpu? Thanks.

Regards, Peter

Dears,

I'm trying to use OpenCVBM application from https://github.com/DLuensch/StereoVis... that use OpenCV but by compiling I am getting:

pb@pb:~/work/StereoVision-ADCensus-master/OpenCVBM/build$ make
[  6%] Generating ui_blockmatchingimage.h
[ 13%] Generating src/moc_OpenCVBMWindow.cxx
[ 20%] Generating src/moc_blockmatchingimage.cxx
[ 26%] Generating src/moc_blockmatching.cxx
/home/r59400/work/StereoVision-ADCensus-master/OpenCVBM/src/blockmatching.h:0: Note: No relevant classes found. No output generated.
[ 33%] Generating src/moc_sgblockmatching.cxx
/home/work/StereoVision-ADCensus-master/OpenCVBM/src/sgblockmatching.h:0: Note: No relevant classes found. No output generated.
[ 40%] Generating ui_OpenCVBMWindow.h
Scanning dependencies of target OpenCVBM
[ 46%] Building CXX object CMakeFiles/OpenCVBM.dir/src/main.cpp.o
[ 53%] Building CXX object CMakeFiles/OpenCVBM.dir/src/OpenCVBMWindow.cpp.o
[ 60%] Building CXX object CMakeFiles/OpenCVBM.dir/src/blockmatchingimage.cpp.o
[ 66%] Building CXX object CMakeFiles/OpenCVBM.dir/src/blockmatching.cpp.o
/home/r59400/work/StereoVision-ADCensus-master/OpenCVBM/src/blockmatching.cpp: In member function ‘cv::Mat BlockMatching::updateBM()’:
/home/r59400/work/StereoVision-ADCensus-master/OpenCVBM/src/blockmatching.cpp:165:13: error: base operand of ‘->’ has non-pointer type ‘cv::StereoBM’
     this->bm->compute(this->imageLeft, this->imageRight, res);
             ^
make[2]: *** [CMakeFiles/OpenCVBM.dir/src/blockmatching.cpp.o] Error 1
make[1]: *** [CMakeFiles/OpenCVBM.dir/all] Error 2
make: *** [all] Error 2

Do you have any advice what's root-cause of this? I would appreciate your help.

Thank you.

Since I am building python2 why should I need to have python3.4? Does it mean that opencv 3.1 does not support python2?

Thanks for your help! I got it - my fault :( I just copied "python examples" from https://opencv-python-tutroals.readth... - I should better check - Thank very much helping me out!

Thanks a lot! I got it. Then I check it with "whos" command in python console and img is really empty - so that's why not working - I fix it - now works. I moved img source same directory as python script. Anyway need to check first img if not empty or cv2.imshow should probably return "img empty" instead of "error" - just little comments. Thanks for your help!

Dears,

I got running exampe

import numpy as np
import cv2

cap = cv2.VideoCapture('vtest.avi')

while(cap.isOpened()):
    ret, frame = cap.read()

    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

    cv2.imshow('frame',gray)
    if cv2.waitKey(1) & 0xFF == ord('q'):
        break

cap.release()
cv2.destroyAllWindows()

When video finishes I got error at Python console and freeze

Traceback (most recent call last):

  File "<ipython-input-1-2cc765029316>", line 1, in <module>
    runfile('C:/tmp/untitled1.py', wdir='C:/tmp')

  File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 685, in runfile
    execfile(filename, namespace)

  File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 71, in execfile
    exec(compile(scripttext, filename, 'exec'), glob, loc)

  File "C:/tmp/untitled1.py", line 16, in <module>
    gray = cv2.cvtColor(frame, cv2.COLOR_BGR2GRAY)

error: ..\..\..\modules\imgproc\src\color.cpp:3739: error: (-215) scn == 3 || scn == 4 in function cv::cvtColor

What correctly to stop video?

Best regards, Peter

Dears,

I try to use OpenCV in Python, and running example such as

import numpy as np
import cv2

img = cv2.imread('messi5.jpg',0)

cv2.namedWindow('image', cv2.WINDOW_NORMAL)
cv2.imshow('image',img)
cv2.waitKey(0) 
cv2.destroyAllWindows()import numpy as np
import cv2

img = cv2.imread('messi5.jpg',0)

cv2.namedWindow('image', cv2.WINDOW_NORMAL)
cv2.imshow('image',img)
cv2.waitKey(0) 
cv2.destroyAllWindows()

Unfortunately I'm not able to dislpay image and getting errors such as

Traceback (most recent call last):

  File "<ipython-input-1-0d251b5710ac>", line 1, in <module>
    runfile('C:/Python27/Scripts/untitled1.py', wdir='C:/Python27/Scripts')

  File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 685, in runfile
    execfile(filename, namespace)


  File "C:\Python27\lib\site-packages\spyderlib\widgets\externalshell\sitecustomize.py", line 71, in execfile
    exec(compile(scripttext, filename, 'exec'), glob, loc)

  File "C:/Python27/Scripts/untitled1.py", line 14, in <module>
    cv2.imshow('image',img)

error: ..\..\..\modules\highgui\src\window.cpp:269: error: (-215) size.width>0 && size.height>0 in function cv::imshow

what;s the propoer way to handle images and displaying hem in python?

Thank you. Peter

Dears,

I got latest OpenCV sources from github. I got error compiling it:

Scanning dependencies of target opencv_videoio
[ 37%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap.cpp.obj
[ 37%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_images.cpp.obj
[ 37%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_encoder.cpp.obj
[ 37%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_mjpeg_decoder.cpp.obj
[ 37%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_cmu.cpp.obj
[ 37%] Building CXX object modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj
In file included from C:\tmp\opencv_latest\opencv\modules\videoio\src\cap_dshow.cpp:337:0:
C:\tmp\opencv_latest\opencv\modules\videoio\src\cap_dshow.cpp: In member function 'void videoInput::getMediaSubtypeAsString(GUID, char*)':
C:\tmp\opencv_latest\opencv\modules\videoio\src\cap_dshow.cpp:2187:41: error: 'sprintf_instead_use_StringCbPrintfA_or_StringCchPrintfA' was not declared in this scope
     if( type == MEDIASUBTYPE_RGB24)     sprintf(tmpStr, "RGB24");
                                         ^
C:\tmp\opencv_latest\opencv\modules\videoio\src\cap_dshow.cpp:2187:57: warning: left operand of comma operator has no effect [-Wunused-value]
     if( type == MEDIASUBTYPE_RGB24)     sprintf(tmpStr, "RGB24");

.
.
.
.
.
.
.

C:\tmp\opencv_latest\opencv\modules\videoio\src\cap_dshow.cpp:2323:31: warning: right operand of comma operator has no effect [-Wunused-value]
     else sprintf(tmpStr, "%u",prop);
                               ^
In file included from C:\tmp\opencv_latest\opencv\modules\videoio\src\cap_dshow.cpp:337:0:
C:/mingw-w64/i686-5.3.0-posix-dwarf-rt_v4-rev0/mingw32/i686-w64-mingw32/include/strsafe.h: At global scope:
C:/mingw-w64/i686-5.3.0-posix-dwarf-rt_v4-rev0/mingw32/i686-w64-mingw32/include/strsafe.h:507:12: warning: inline function 'HRESULT StringCbVPrintfA(STRSAFE_LPSTR, size_t, STRSAFE_LPCSTR, va_list)' used but never defined
 STRSAFEAPI StringCbVPrintfA(STRSAFE_LPSTR pszDest,size_t cbDest,STRSAFE_LPCSTR pszFormat,va_list argList);
            ^
modules\videoio\CMakeFiles\opencv_videoio.dir\build.make:187: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj' failed
mingw32-make[2]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/src/cap_dshow.cpp.obj] Error 1
CMakeFiles\Makefile2:4420: recipe for target 'modules/videoio/CMakeFiles/opencv_videoio.dir/all' failed
mingw32-make[1]: *** [modules/videoio/CMakeFiles/opencv_videoio.dir/all] Error 2
Makefile:159: recipe for target 'all' failed
mingw32-make: *** [all] Error 2

C:\tmp\opencv_latest\build>

Can anyone help me what issue is it?

Thank you.

Best regards, Peter

Hello all,

I'm trying to get running this example

import numpy as np
import cv2
from matplotlib import pyplot as plt

img = cv2.imread('messi5.jpg',0)
plt.imshow(img, cmap = 'gray', interpolation = 'bicubic')
plt.xticks([]), plt.yticks([])  # to hide tick values on X and Y axis
plt.show()

Examples shows image but the code at plt.show() get stopped and now further command promt avialable from python. I'm running it within

Python 2.7.10 (default, May 23 2015, 09:40:32) [MSC v.1500 32 bit (Intel)] on win32

Thank you for your advice.

Regards,Peter

I did report an issue. I use CMake GUI howto do "cmake -DBUILD_opencv_dnn=OFF" within GUI?

Dears,

I'm trying to compile opencv_contrib and I am getting errors as follows

[ 54%] Building CXX object modules/dnn/3rdparty/protobuf/CMakeFiles/libprotobuf.dir/src/google/protobuf/compiler/importer.cc.obj
In file included from  C:\opencv\sources_contrib\modules\dnn\3rdparty\protobuf\src\google\protobuf\compiler\importer.cc:38:0:
c:\mingw\include\unistd.h:78:11: error: '_cdecl' does not name a type
 _EXTERN_C _cdecl __MINGW_NOTHROW
           ^
In file included from C:\opencv\sources_contrib\modules\dnn\3rdparty\protobuf\src\google\protobuf\compiler\importer.cc:38:0:
c:\mingw\include\unistd.h:104:1: error: '_cdecl' does not name a type
 _cdecl __MINGW_NOTHROW
 ^
c:\mingw\include\unistd.h: In function 'int nanosleep(const timespec*, timespec*)':
c:\mingw\include\unistd.h:114:51: error: '__mingw_sleep' was not declared in this scope
     ? (unsigned)(-1) : (unsigned)(period->tv_nsec));
                                                   ^
c:\mingw\include\unistd.h: At global scope:
c:\mingw\include\unistd.h:125:28: error: expected initializer before 'usleep'
 int _cdecl __MINGW_NOTHROW usleep( useconds_t )__MINGW_ATTRIB_DEPRECATED;
                            ^
c:\mingw\include\unistd.h: In function 'int usleep(useconds_t)':
c:\mingw\include\unistd.h:129:73: error: '__mingw_sleep' was not declared in this scope
 int usleep( useconds_t period ){ return __mingw_sleep( 0, 1000 * period ); }
                                                                         ^
c:\mingw\include\unistd.h: At global scope:
c:\mingw\include\unistd.h:138:33: error: expected initializer before 'sleep'
 unsigned _cdecl __MINGW_NOTHROW sleep( unsigned );
                                 ^
c:\mingw\include\unistd.h: In function 'unsigned int sleep(unsigned int)':
c:\mingw\include\unistd.h:142:68: error: '__mingw_sleep' was not declared in this scope
 unsigned sleep( unsigned period ){ return __mingw_sleep( period, 0 ); }
                                                                    ^
c:\mingw\include\unistd.h: At global scope:
c:\mingw\include\unistd.h:153:12: error: expected initializer before 'ftruncate'
 int _cdecl ftruncate( int, off_t );
            ^
In file included from c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\cmath:44:0,
                 from c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\random:38,
                 from c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\bits\stl_algo.h:65,
                 from c:\mingw\lib\gcc\mingw32\4.8.1\include\c++\algorithm:62,
                 from C:\opencv\sources_contrib\modules\dnn\3rdparty\protobuf\src\google\protobuf\compiler\importer.cc:45:
c:\mingw\include\math.h: In function 'float hypotf(float, float)':
c:\mingw\include\math.h:635:30: error: '_hypot' was not declared in this scope
 { return (float)(_hypot (x, y)); }
                              ^
modules\dnn\3rdparty\protobuf\CMakeFiles\libprotobuf.dir\build.make:62: recipe for target 'modules/dnn/3rdparty/protobuf/CMakeFiles/libprotobuf.dir/src/google/protobuf/compiler/importer.cc.obj' failed
mingw32-make[2]: *** [modules/dnn/3rdparty/protobuf/CMakeFiles/libprotobuf.dir/src/google/protobuf/compiler/importer.cc.obj] Error 1
CMakeFiles\Makefile2:5306: recipe for target 'modules/dnn/3rdparty/protobuf/CMakeFiles/libprotobuf.dir/all' failed
mingw32-make[1]: *** [modules/dnn/3rdparty/protobuf/CMakeFiles/libprotobuf.dir/all] Error 2
Makefile:148: recipe for target 'all' failed
mingw32-make: *** [all] Error 2

Did you experienced such behavior? Is there any solution for this?

Thank you.

Best regards.