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2013-05-22 04:41:58 -0600 | asked a question | HOGDescriptor::detectMultiScale with TBB on ARM Hi all! I have implemented in an ARM a computer vision application that uses OpenCV's HOGDescriptor::detectMultiScale. I have found that the execution of HOGDescriptor::detectMultiScale function is accelerated a lot when I compile OpenCV with TBB option:
Is this the correct behaviour?? I found it very strange, as the ARM I am using has only two cores. How does the TBB acceleration work?? why is so efficient? I am using a ARM® dual-core Cortex™-A9 MPCore™ / 800 MHz, OpenCV 2.4.3, and TBB 4.1. Thanks in advance! |
2013-03-26 10:05:26 -0600 | asked a question | problems cross compiling OpenCV with FFMpeg for ARM Linux Hello all, I am trying to cross compile OpenCV with FFMPEG for ARM Linux, but I get some errors. First, I have cross compiled FFMPEG using these flags: ./configure --enable-cross-compile --cross-prefix=arm-linux-gnueabi- --cc=arm-linux-gnueabi-gcc --cxx=arm-linux-gnueabi-g++ --arch=arm --target-os=linux --disable-armv5te --disable-armv6 --disable-armv6t2 --enable-libopencv --enable-pic prefix=/home/mypath/ffmpeg_binARM Then, I have modified "OpenCVFindLibsVideo.cmake" file In order to "see" the ffmpeg libraries: --- FFMPEG ---ocv_clear_vars(HAVE_FFMPEG HAVE_FFMPEG_CODEC HAVE_FFMPEG_FORMAT HAVE_FFMPEG_UTIL HAVE_FFMPEG_SWSCALE HAVE_GENTOO_FFMPEG HAVE_FFMPEG_FFMPEG) if(WITH_FFMPEG) if(WIN32) include("${OpenCV_SOURCE_DIR}/3rdparty/ffmpeg/ffmpeg_version.cmake") elseif(UNIX) ocv_include_directories(${FFMPEG_INCLUDE_DIR}) endif() ------------------------------------------------------------Finally, I have tried to cross compile OpenCV using this help: http://docs.opencv.org/doc/tutorials/introduction/crosscompilation/arm_crosscompile_with_cmake.html cd ~/opencv/platforms/linux mkdir -p Build_ARM cd Build_ARM cmake -DSOFTFP=ON -DCMAKE_TOOLCHAIN_FILE=../arm-gnueabi.toolchain.cmake ../../.. ...and I get these errors when I do "make". Can anyone help me???? [ 34%] Building CXX object modules/highgui/CMakeFiles/opencv_highgui.dir/src/bitstrm.cpp.o
Linking CXX shared library ../../lib/libopencv_highgui.so
/home/mypath/ffmpeg_binARM/lib/libavformat.a(matroskaenc.o): In function |
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2013-03-11 06:20:39 -0600 | asked a question | cross compile OpenCV with FFMPEG for ARM Linux Hi all! I want to cross compile OpenCV with FFMPG for ARM Linux, but I don't know how to configure Cmake. I have previously downloaded ffmpeg codec from www.ffmpeg.org, and I have built it for ARM. I don't know how to configure Cmake to "see" the built ffmpeg libraries (libavcodec.a, libavformat.a, libavutil.a, libswscale.a). Can anyone help me?? Thanks in advance! |