【openCV学习笔记】【3】高斯模糊一张图片（_cvSmooth相关编译错误）

代码如下：

#include <iostream>
#include <opencv/highgui.h>
#include <opencv/cv.h>


void example(IplImage* image)
{
    // Create some windows to show the input
    // and output images in.
    //
    cvNamedWindow("Example2_4-in", CV_WINDOW_AUTOSIZE);
    cvNamedWindow("Example2_4-out", CV_WINDOW_AUTOSIZE);
    
    // Create a window to show our input image
    //
    cvShowImage("Example2_4-in", image);
    
    // Create an image to hold the smoothed output
    //
    IplImage* out = cvCreateImage(
                                  cvGetSize(image),
                                  IPL_DEPTH_8U,
                                  3
                                  );
    printf("%d %d", cvGetSize(image).height, cvGetSize(image).width);
    
    // Do the smoothing
    //
    cvSmooth(image, image, CV_GAUSSIAN, 3, 3);
    //cvSmooth(out, out, CV_GAUSSIAN, 3, 3);
    
    // Show the smoothed image in the output window
    //
    cvShowImage("Example2_4-out", out);
    
    // Be tidy
    //
    cvReleaseImage(&out);
    
    // Wait for the user to hit a key, then clean up the windows
    //
    cvWaitKey(0);
    cvDestroyWindow("Example2_4-in");
    cvDestroyWindow("Example2_4-out");
    
}

int main(int argc, char** argv)
{
    IplImage* img = cvLoadImage("/Users/apple/Pictures/openCV/standard_img/lena.jpg");
    cvNamedWindow("Example1", CV_WINDOW_AUTOSIZE);
    cvShowImage("Example1", img);
    example(img);
    //  cvWaitKey(0);
    cvReleaseImage(&img);
    cvDestroyWindow("Example1");
}

起初编译时出现错误：

Undefined symbols for architecture x86_64:
  "_cvSmooth", referenced from:
      _main in main.o
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

在stackoverflow上一个回答非常给力。

http://stackoverflow.com/questions/9219612/undefined-symbols-cvsmooth-in-opencv2-3-1-on-mac

Add libopencv_imgproc.dylib to your Xcode project and you should be off to the races.