OpenCV下載地址：http://opencv.org

在使用的地方，把.m改成.mm

新增標頭檔案

#ifdef __cplusplus

#import <opencv2/opencv.hpp>

// 圖片轉換

#import <opencv2/imgcodecs/ios.h>

#endif

- (IBAction)change:(id)sender {

    cv::Mat cvImage;

    UIImage *image = self.imageView.image;

// Convert UIImage * to cv::Mat

    UIImageToMat

    cv::Mat gray;

// Convert the image to grayscale;

    cv::cvtColor(cvImage, gray,CV_RGBA2GRAY);

// Apply Gaussian filter to remove small edges

    cv::GaussianBlur(gray, gray,cv::Size(5,5),1.2,1.2);

// Calculate edges with Canny

    cv::Mat edges;

    cv::Canny(gray, edges,0,60

// Fill image with white color

    cvImage.setTo(cv::Scalar::all(255));

// Change color on edges

    cvImage.setTo(cv::Scalar(0,128,255,255),edges);

// Convert cv::Mat to UIImage* and show the resulting image

self.imageView.image =MatToUIImage(cvImage);

}

示例demo：https://github.com/MiftMy/XMOpenCV