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Небольшой пример функции, как сконвертировать изображения из формата Mat для OpenCV в BufferedImage

package info.privateblog;

import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;

import javax.imageio.ImageIO;

import org.opencv.core.Core;
import org.opencv.core.Mat;
import org.opencv.imgcodecs.Imgcodecs;

public class OpenCVReadImage {
	/**
	 * @param args
	 * @throws IOException 
	 */
	public static void main(String[] args) throws IOException {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);  
        
    	ImageIO.write(convertMatToBufferedImage(Imgcodecs.imread("e:/HC-SR501.jpg")), "jpg", new File("e:/test.jpg"));
	}
	
	private static BufferedImage convertMatToBufferedImage(Mat mat) {
     	byte[] data = new byte[mat.width() * mat.height() * (int)mat.elemSize()];
        int type;
        mat.get(0, 0, data);

        switch (mat.channels()) {  
	        case 1:  
	            type = BufferedImage.TYPE_BYTE_GRAY;  
	            break;  
	        case 3:  
	            type = BufferedImage.TYPE_3BYTE_BGR;  
	            // bgr to rgb  
	            byte b;  
	            for(int i=0; i<data.length; i=i+3) {  
	                b = data[i];  
	                data[i] = data[i+2];  
	                data[i+2] = b;  
	            }  
	            break;  
	        default:  
	        	throw new IllegalStateException("Unsupported number of channels");
        }  
        
        BufferedImage out = new BufferedImage(mat.width(), mat.height(), type);

        out.getRaster().setDataElements(0, 0, mat.width(), mat.height(), data);
        
        return out;
	}
}