【OpenCV】 Mat

Mat创建图像并保存

第一种方法：

         Mat src = new Mat();
         src.create(300, 300, CvType.CV_8UC3);    //创建300 * 300 ；图像类型
         src.setTo(new Scalar(0, 0, 255)); 		//红色
         Imgcodecs.imwrite("D:\\openCV_picture\\image_01.jpg", src);

第二种【常用】方法：（通道是指每个像素点的通道数）

Mat src = Mat.zeros(300, 300, CvType.CV_8UC1);		//zeros : RGB(0, 0, 0)	CV_8UC1通道数为1
Imgcodecs.imwrite("D:\\openCV_picture\\image_02.jpg", src);

获取图片的信息（灰度图片单通道） 

         Mat src = Mat.zeros(300, 200, Imgcodecs.CV_LOAD_IMAGE_GRAYSCALE);
         int type = src.type();
         int width = src.rows();
         int height = src.cols();
         int channels = src.channels();
         System.out.println("width:" + width);
         System.out.println("height:" + height);
         System.out.println("channels:" + channels);
         
         if(CvType.CV_8UC3 == type) {
        	 System.out.println("type : CV_8UC3");
         }else if(CvType.CV_8UC1 == type) {
        	 System.out.println("type : CV_8UC1");
         }else {
        	 System.out.println("unknown");
         }

输出：