macOS上使用openCV

July 22, 2017

当前环境: macOS 10.12.5 && Xcode8

安装

使用homebrew安装:

1). brew install cmake 2). brew install opencv

运行报错:

➜  ~ brew install opencv
Error: No available formula with the name "opencv"
It was migrated from homebrew/core to homebrew/science.
You can access it again by running:
  brew tap homebrew/science
➜  ~ brew search opencv
homebrew/science/opencv

If you meant "opencv" specifically:
It was migrated from homebrew/core to homebrew/science.
You can access it again by running:
  brew tap homebrew/science

按提示先后执行如下命令,可以安装成功

$ brew tap homebrew/science
$ brew install opencv

安装完成后路径/usr/local/Cellar下会有openCV文件夹:

Xcode Command Line Tool

使用Xcode的Command Line Tool 调试OpenCV (当前2.4.13.2版本举例)

1). 创建Command Line Tool新工程,语言选择C++ 2). 复制/usr/local/Cellar/opencv/2.4.13.2/lib文件夹到项目目录

3). targets -> Build Phases -> Link Binary With Libraries 选择lib中的.dylib文件(不选替身文件)。删除项目目录下这个lib文件夹内的其他多余的文件。

4). targets -> Build Setting中,设置: Header Search Path 为 /usr/local/include Library Search Path 为 /usr/local/lib (或者对应到项目中的lib目录,如$(PROJECT_DIR)/myproject/lib)

完成上边操作,就算配置完了,写代码看看运行效果:

注: Build Setting 中的C++ Standard Libraray 仍然使用的工程默认libc++,没做修改

iOS工程中使用

使用非常简单:

首先从http://opencv.org/releases.html下载新版本的iOS pack,解压后是个opencv2.framework文件。

1). 新建一个iOS项目,将opencv2.framework拖到工程中 2). 手动配置好pch文件,pch文件中必须要加:

#ifdef __cplusplus
    #import <opencv2/opencv.hpp>
#endif

3). 用到opencv的.m文件后缀改为.mm 4). 编写测试代码:(这里完全照搬此处:http://blog.csdn.net/songrotek/article/details/40780073))

#import <opencv2/opencv.hpp>
#import <opencv2/imgproc/types_c.h>
#import <opencv2/imgcodecs/ios.h>

//using namespace cv;

@interface ViewController ()

{
    cv::Mat cvImage;
}
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    UIImage *image = [UIImage imageNamed:@"2"];
    // Convert UIImage * to cv::Mat
    UIImageToMat(image, cvImage);
    if (!cvImage.empty()) {
        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);
    }
}

运行效果:

参考 http://kurtjacobs.weebly.com/computer-vision/up-and-running-with-opencv-30-for-ios https://imsun.net/posts/iOS-OpenCV-config/

swift 项目集成 https://medium.com/@borisohayon/ios-opencv-and-swift-1ee3e3a5735b