uiimage to mat and mat to uiimage

OpenCVWrapper.mm

#import <opencv2/imgcodecs/ios.h>

+(UIImage *) makeGrayFromImage:(UIImage *)image{

    cv::Mat imageMat;

    UIImageToMat(image, imageMat);

    

    if (imageMat.channels() ==1)

        return image;

    

    

    cv::Mat grayMat;

    cv::cvtColor(imageMat, grayMat, CV_BGR2GRAY);

    return MatToUIImage(grayMat);

}

install opencv on mac

ref : http://junwayh.logdown.com/posts/607175

brew install cmake

2. 安裝OpenCV

先到官方網站下載 http://opencv.org/
解壓縮後開終端機cd到解壓縮的資料夾中

mkdir release
cd release
cmake -G "Unix Makefiles" ..
make
sudo make install

3. 建立專案

開啟XCode，選擇Command Line Tool

進入Build Settings介面
往下找到 Library Search Paths 並新增 /usr/local/lib

再來對 header search paths 新增 /usr/local/include 及 /usr/local/include/opencv

直接按下 / 會跳出 go to the folder 輸入 /usr/local/lib
然後把所有opencv的lib都選起來再按 Add 就大功告成

隨便找個sample code跑跑看吧!!

#include <iostream>
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>

using namespace cv ;
using namespace std ;

int main() {
    cv::Mat image = cv::imread("your image path") ;
    cv::namedWindow("Image") ;
    cv::imshow("Image", image) ;
    cv::waitKey() ;
    
    return 0;
}

這邊路徑要用絕對路徑

cv::Mat image = cv::imread("/Users/abc/Desktop/opencv_test/test.jpg",CV_LOAD_IMAGE_GRAYSCALE) ;