I am building a program that uses openCV on a raspberry pi. I am gettng during linking relating to missing symbols. How

Hi Peter and Berak,

Many thanks for the answers and the tip about the precompiled binaries not working with g++. Peter, your visual studio project helped tremendously because I was able to see what libraries you had specified as well as how you had specified the adtional includes.

The project compiles and links successfully. Noyte: Another error I was making was that I was trying to link using 64bit libraries. I had a stack of unresolved linker errors inspite of including all the libraries in the additional dependencies edit box. I changed to using 32bit libraries and was able to link successfully.

Hi all,

I am trying to compile a C++ program that uses opencv on a computer running windows 7 ultimate 64bit. I have mingw installed. My g++ commandline is as follows. g++ -I C:\devkit\mingw\include -I C:\opencv\build\include\opencv2\highgui -I C:\opencv\build\include\opencv2\imgproc -I C:\opencv\build\include\opencv2\core -O3 BatchvOICe.cpp -o vl01.exe -l C:\opencv\build\x64\vc12\lib\opencv_core -l C:\opencv\build\x64\vc12\lib\opencv_imgproc -l C:\opencv\build\x64\vc12\lib\opencv_highgui In file included from BatchvOICe.cpp:8:0: C:\opencv\build\include\opencv2\highgui/highgui.hpp:46:33: fatal error: opencv2/ core/core.hpp: No such file or directory compilation terminated.

How do I solve this? I do not want to change include paths in the opencv source.

In addition, I have downloaded visual studio express 2013. I am happy to set build paths etc but what do I set? I see instructions only for visual studio 2012. I suspect they will be the same for 2013 and I did try them but I encounter the same errors.

Note: I have installed opencv-2_4_10.exe.

I see references to opencv 3.0. My program is basic therefore I am willing to switch to opencv 3 if compiling is easier. Pranav

Hi all,

I have opencv version 2.3 installed on my raspberry pi running raspbian. I looked at http://docs.opencv.org/trunk/doc/tutorials/introduction/linux_install/linux_install.html the tutorial talks about opencv 3.0.0. Is this still under development? If not, how do I upgrade to it? Please see below for installed version details pi@piprime ~ $ dpkg -l | grep libopencv
ii libopencv-calib3d2.3 2.3.1-11 armhf
computer vision Camera Calibration library
ii libopencv-core2.3 2.3.1-11 armhf
computer vision core library
ii libopencv-features2d2.3 2.3.1-11 armhf
computer vision Feature Detection and Descriptor Extraction library
ii libopencv-flann2.3 2.3.1-11 armhf
computer vision Clustering and Search in Multi-Dimensional spaces library
ii libopencv-highgui2.3 2.3.1-11 armhf
computer vision High-level GUI and Media I/O library
ii libopencv-imgproc2.3 2.3.1-11 armhf
computer vision Image Processing library
ii libopencv-legacy2.3 2.3.1-11 armhf
computer vision legacy library
ii libopencv-ml2.3 2.3.1-11 armhf
computer vision Machine Learning library
ii libopencv-objdetect2.3 2.3.1-11 armhf
computer vision Object Detection library
ii libopencv-video2.3 2.3.1-11 armhf
computer vision Video analysis library
pi@piprime ~ $

I want to upgrade because I want to run feature detection code. Please see the below python program as an example of what I want to run. Note: This program may have errors because I have been unable to test it.

import cv2
import time
#test program for monocular obstacle detection
vc = cv2.VideoCapture(-1)
if vc.isOpened(): # try to get the first frame
    print 'fetching first frame'
    rval, frame = vc.read()
else:
    rval = False
    print 'unable to fetch frame'
while rval:
    rval, frame = vc.read()
    time.sleep(100)
    frame=vc.read()
    print 'images read.'
    #we now have two images one second apart
    orb = cv2.ORB()
    kp1, des1 = orb.detectAndCompute(rval,None)
    kp2, des2 = orb.detectAndCompute(frame,None)
    print 'detection  done'
    bf = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True)
    matches = bf.match(des1,des2)
    print 'matches done.'
    matches = sorted(matches, key = lambda x:x.distance)
    print matches[0].distance
print 'end.'

Hi all,

I have opencv version 2.3 installed on my raspberry pi running raspbian. I looked at http://docs.opencv.org/trunk/doc/tutorials/introduction/linux_install/linux_install.html the tutorial talks about opencv 3.0.0. Is this still under development? If not, how do I upgrade to it? Please see below for installed version details pi@piprime ~ $ dpkg -l | grep libopencv
ii libopencv-calib3d2.3 2.3.1-11 armhf
computer vision Camera Calibration library
ii libopencv-core2.3 2.3.1-11 armhf
computer vision core library
ii libopencv-features2d2.3 2.3.1-11 armhf
computer vision Feature Detection and Descriptor Extraction library
ii libopencv-flann2.3 2.3.1-11 armhf
computer vision Clustering and Search in Multi-Dimensional spaces library
ii libopencv-highgui2.3 2.3.1-11 armhf
computer vision High-level GUI and Media I/O library
ii libopencv-imgproc2.3 2.3.1-11 armhf
computer vision Image Processing library
ii libopencv-legacy2.3 2.3.1-11 armhf
computer vision legacy library
ii libopencv-ml2.3 2.3.1-11 armhf
computer vision Machine Learning library
ii libopencv-objdetect2.3 2.3.1-11 armhf
computer vision Object Detection library
ii libopencv-video2.3 2.3.1-11 armhf
computer vision Video analysis library
pi@piprime ~ $

I want to upgrade because I want to run feature detection code. Please see the below python program as an example of what I want to run. Note: This program may have errors because I have been unable to test it.

import cv2 import time

test program for monocular obstacle detection

vc = cv2.VideoCapture(-1) if vc.isOpened(): # try to get the first frame print 'fetching first frame' rval, frame = vc.read() else: rval = False print 'unable to fetch frame' while rval: rval, frame = vc.read() time.sleep(100) frame=vc.read() print 'images read.' #we now have two images one second apart orb = cv2.ORB() kp1, des1 = orb.detectAndCompute(rval,None) kp2, des2 = orb.detectAndCompute(frame,None) print 'detection done' bf = cv2.BFMatcher(cv2.NORM_HAMMING, crossCheck=True) matches = bf.match(des1,des2) print 'matches done.' matches = sorted(matches, key = lambda x:x.distance) print matches[0].distance print 'end.'

Hi all, I am trying to build opencv version 2.4.6.1 on Raspbian (Linux raspberrypi 3.6.11+ #538 PREEMPT Fri Aug 30 20:42:08 BST 2013 armv6l) running on a raspberry pi B. I am following the instructions at the following link; http://denis.doublebuffer.net/lablog/2012/08/10/setting-everything-up-for-opencv-raspberry-pi/ Make stops around 61%. See the following error dump.

[ 67%] Building CXX object modules/gpu/CMakeFiles/opencv_gpu.dir/src/denoising.cpp.o
[ 67%] Building CXX object modules/gpu/CMakeFiles/opencv_gpu.dir/src/bilateral_filter.cpp. o
Linking CXX shared library ../../lib/libopencv_gpu.so
[ 67%] Built target opencv_gpu
[ 67%] Generating opencv_perf_gpu_pch_dephelp.cxx
[ 68%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu_pch_dephelp.dir/opencv_p erf_gpu_pch_dephelp.cxx.o
Linking CXX static library ../../lib/libopencv_perf_gpu_pch_dephelp.a
[ 68%] Built target opencv_perf_gpu_pch_dephelp
[ 68%] Generating perf_precomp.hpp
[ 68%] Generating perf_precomp.hpp.gch/opencv_perf_gpu_RELEASE.gch
[ 68%] Built target pch_Generate_opencv_perf_gpu
[ 68%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_precomp.cp p.o
[ 68%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_video.cpp. o
[ 69%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_features2d .cpp.o
[ 69%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_calib3d.cp p.o
[ 69%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_labeling.c pp.o
[ 69%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_denoising. cpp.o
[ 69%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_main.cpp.o [ 69%] Building CXX object modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_core.cpp.o c++: internal compiler error: Killed (program cc1plus)
Please submit a full bug report,
with preprocessed source if appropriate.
See <file: usr="" share="" doc="" gcc-4.6="" readme.bugs=""> for instructions.
make[2]: * [modules/gpu/CMakeFiles/opencv_perf_gpu.dir/perf/perf_core.cpp.o] Error 4
make[1]: [modules/gpu/CMakeFiles/opencv_perf_gpu.dir/all] Error 2
make: ** [all] Error 2

How do I see what the problem is and correct it?

Pranav

Just a hunch but could you be specifying the wrong camera id? I see it is a -1. I am new to opencv and am using it on Linux but my camera id is not negative.

Hi all again, I am trying to attach the code with this comment. Dropbox did not like my posting the link to the forum. The significant portion of the code giving me grief is below. I am trying to copy the pixel coordinates from the variable gray which is of type Mat to a 2d array of type int. code: for(int lc=0;lc<N;lc++) {//start of matrix population for loop int mVal=gray.at<uchar>(lc,lc);

A[lc][lc]=double(mVal); }//end of matrix population for loop

Hi all,

I have had to change the program radically since I had started with soundscape code that was not generating stereo sound. Please see the code below. I am trying to run the program continuously which is not happening. I am not sure of the way the keyboard is handled and that could be the problem but I could be wrong.

I am unable to paste the entire code so am forced to give a link to it. https://dl.dropboxusercontent.com/u/3688386/vl.cpp Pranav

Hi,

Got it compiled and built!! Its running and tells me that it cannot find camera 0 but that is something with my setup. I am going to doublecheck if I have webcam support installed. Note: I am referring to simple.cpp here.

Many thanks!! Pranav

Hi Berak, Many thanks for your efforts. I updated the ghitub repository. g++ -I /usr/include -I /home/noddy/vOICe/s eeingwithsound/RtAudio simple.cpp -lopencv_core -lopencv_imgproc -lopencv_highgui
simple.cpp: In function ‘int main(int, char*)’:
simple.cpp:58:59: error: cannot convert ‘_IO_FILE’ to ‘const char’ for argument ‘1’ to ‘int printf(const char, ...)’

Are we using different versions of opencv by any chance?

I agree irc could be a faster way to communicate however, we run into the issue of timezones. I am 5.5 hours ahead of UTC. Do you have a website or e-mail address where I can reach you?

Hi all,

I have found the problem. I was misinterpreting what g++ was telling me. The problem was with the path in the #include directive. highgui etc have their own directories in the /usr/include/opencv2 directory. I have now got past that problem but am getting scope related errors. I am still continuing to do something incorrectly since from what I understand from Berak's documentation, the code runs on his setup.

main.cpp: In function ‘int main(int, char**)’:
main.cpp:143:18: error: ‘CAP_PROP_FRAME_HEIGHT’ was not declared in this scope
main.cpp:144:18: error: ‘CAP_PROP_FRAME_WIDTH’ was not declared in this scope

Hi all, I am trying to compile the program. I have opencv installed on Ubuntu 12.04 LTS. I am using the following commandline.

g++ -i /usr/include/opencv2 -lopencv_core -lopencv_imgproc -lopencv_highgui -lopencv_ml -lopencv_video -lopencv_features2d -lopencv_calib3d -lopencv_objdetect -lopencv_contrib -lopencv_legacy -lopencv_flann ./main.cpp

I am getting the following error. cc1plus: error: unrecognized command line option ‘-i’

I am not sure what is happening. I suspect I am making an error in including the libraries. I do not know which ones to include.

Pranav

Many many thanks Berak. I'll give it a go over the weekend!

Hi berak and all, Some of your questions have already been answered in previous comments.

I do not plan to write the wave files to disk. <smile The idea is to write to the Linux audio device. If I understand things correctly, all devices in Linux are files. The vOICe sounds one frame per second so, I plan to capture one frame and then render that as a soundscape.

Pranav