OpenCV调整图片对比度

MMOpenCVHelper

用来转换c++image矩阵和 uiimage变化

代码

  - (void)viewDidLoad {
    [super viewDidLoad];

    
    
    UIImage *image1 = [UIImage imageNamed:@"lenda.jpg"];
    
    /// 读入用户提供的图像
    Mat image = [MMOpenCVHelper cvMatFromUIImage:image1];
    
    //获得图片的大小和类型
    Mat new_image = Mat::zeros( image.size(), image.type() );
    
    /// 初始化
    int alpha = 4;
    int beta = 2;
    
    /// 执行运算 new_image(i,j) = alpha*image(i,j) + beta
    for( int y = 0; y < image.rows; y++ )
    {
        for( int x = 0; x < image.cols; x++ )
        {
            
            //某个点的 3个数据
            for( int c = 0; c < 3; c++ )
            {
                new_image.at<Vec3b>(y,x)[c] = saturate_cast<uchar>( alpha*( image.at<Vec3b>(y,x)[c] ) + beta );
            }
        }
    }
   
    
    
    
    self.imageView2.backgroundColor = [UIColor redColor];
    self.imageView2.image = [MMOpenCVHelper UIImageFromCVMat:new_image];
    
    
    
}