opencv with cuda error

when i test my opencv package in c file by using the command
$ gcc cvtest.c -o cvtest  `pkg-config opencv --cflags --libs`
There are with some error

/usr/bin/ld: cannot find -lcufft
/usr/bin/ld: cannot find -lnpps
/usr/bin/ld: cannot find -lnppi
/usr/bin/ld: cannot find -lnppc
/usr/bin/ld: cannot find -lcudart

According to this post in stackoverflow
http://stackoverflow.com/questions/24322466/makefile-opencv-stopped-working

i change the command with -L to my cuda lib path
$gcc -L /usr/local/cuda/lib64 cvtest.c -o cvtest  `pkg-config opencv --cflags --libs`

it's working

or put the cuda lib path in LIBRARY_PATH
export LIBRARY_PATH=/usr/local/cuda/lib64

opencv anaconda error

when import cv2, there is an error

ImportError: /anaconda/bin/../lib/libm.so.6: version `GLIBC_2.15' not found (required by /usr/lib/x86_64-linux-gnu/libxvidcore.so.4)

just copy libm.so.6 from '/usr/lib/x86_64-linux-gnu' to '/home/username/anaconda/lib/'
then it can work

VC++ 2012 opencv error "0xc0000005讀取位置0x00000000時發生存取違規"

#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <iostream>
#include <opencv/cv.h>

using namespace cv;
using namespace std;

int main( int argc, char** argv ){
    Mat image;
    image = imread("1.jpg");
    namedWindow( "show window", CV_WINDOW_AUTOSIZE );
    imshow( "show window", image );
    waitKey(0);
    return 0;
}

應該是沒找到圖檔
建置VC++空專案時不要為方案建立目錄
將圖檔放在專案資料夾即可找到圖
x64系統
組態管理員->新增x64平台(來源複製Win32，勾選建立新專案平台

compiling opencv with g++

There are two methods in compiling opencv with g++ without IDE

First is typing following command in command line directly

~$  g++ testcv.cpp -o testcv `pkg-config opencv --cflags --libs `

ps: ` place in the left of 1 on the keyboard, not ' in the left of Enter

 Second is to set a makefile as below:

testcv: testcv.cpp
g++  -o ${@} $<  `pkg-config opencv --cflags --libs `

and then type make in command line

~$ make

note:

keep the sequence of the command. put the `pkg-config opencv --cflags --libs ` after others.

If you make a command like

~$  g++  `pkg-config opencv --cflags --libs ` testcv.cpp -o testcv

there will be error

I don't know why...><
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opencv on qt creater ubuntu

set .pro

INCLUDEPATH += /usr/local/include

LIBS += `pkg-config opencv --libs`

If an error occur like this

"Cannot connect creator comm socket /tmp/qt_temp.S27961/stub-socket: No such file or directory"

go to "Run Settings" and then cancel "Run in terminal"

open cv in python

Step 1: Download and install Python 2.7 & OpenCV 2.2

Step 2: Download and install NumPy 1.5.1 & SciPy 0.9.0rc5

Step 3: Setup Windows Path in Environment Variables(Add “C:/Python2.7;C:/OpenCV2.2/bin” to PATH)

Step 4:  Copy the content of folder “C:/OpenCV2.2/Python2.7/Lib/site-packages” to folder “C:\Python27\Lib\site-packages“