java + opencv 实现图片转油画效果

import org.opencv.core.*;
import org.opencv.imgcodecs.Imgcodecs;
import org.opencv.imgproc.Imgproc;

import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;

public class HsyOpencvUtils {

    static {
        // 解决awt报错问题
        System.setProperty("java.awt.headless", "false");
        System.out.println("java.library.path = " + System.getProperty("java.library.path"));
        // 加载动态库
        // URL url = ClassLoader.getSystemResource("opencv_java341.dll");
        // URL url = HsyOpencvTest.class.getResource("opencv_java320.dll");
        // String path = url.toString();
        // System.out.println( "path = " + path );
        System.load( "E:\\git\\study\\opencvHandleImg-master\\out\\production\\Opencv\\opencv_java320.dll" );
    }

    /**
     * 油画特效
     * @param imagePath
     * @param outputPath
     */
    public static void oilPaintingOperation( String imagePath,String outputPath ){
        long t = System.currentTimeMillis();
        Mat mat_src = Imgcodecs.imread(imagePath);
        Mat mat_gray = HsyOpencvUtils.getGrayMat(mat_src);
        Mat mat_dst = new Mat();
        mat_gray.copyTo( mat_dst );
        int height = mat_gray.rows();
        int width = mat_gray.cols();
        int[] array = new int[ 8 ];
        for( int row=4;row<( height - 4 );row++ ){
            for( int col=4;col< ( width - 4 );col++ ){
                // int[] array = new int[ 8 ];
                array[ 0 ] = 0;
                array[ 1 ] = 0;
                array[ 2 ] = 0;
                array[ 3 ] = 0;
                array[ 4 ] = 0;
                array[ 5 ] = 0;
                array[ 6 ] = 0;
                array[ 7 ] = 0;
                for( int m =-4;m<=4;m++ ){
                    int row1 = row + m;
                    for( int n=-4;n<=4;n++ ){
                        // 0 ~ 7
                        Double index = mat_gray.get(row1, col + n)[0] / 32;
                        array[ index.intValue() ]++;
                    }
                }
                // 求 array 的最大值以及对应角标
                int value_max = array[0];
                int index_max = 0;
                for( int index=1;index<=7;index++ ){
                    int value_curr = array[index];
                    if( value_max < value_curr ){
                        value_max = value_curr;
                        index_max = index;
                    }
                }
                double[] bgr = null;

                int v1 = index_max * 32;
                int v2 = ( index_max + 1 ) * 32;
                for( int m=-4;m<=4;m++ ){
                    int row1 = row + m;
                    for( int n=-4;n<=4;n++ ){
                        int col1 = col + n;
                        double v = mat_gray.get( row1, col1 )[ 0 ];
                        if( v >= v1 && v <= v2 ){
                            bgr = mat_src.get( row1, col1 );
                        }
                    }
                }
                mat_dst.put( row,col,bgr );
            }
        }
        Imgcodecs.imwrite( outputPath,mat_dst );
        System.out.println( "耗时：" + ( System.currentTimeMillis() - t ) + "毫秒" );
    }
}

import java.io.File;
public class HsyOpencvTest {

    public static void main(String[] args) {
        String imagePath = "E:\\sucai\\video\\liuyifei2.jpeg";
        String outputPath = "E:\\sucai\\video\\liuyifei2_oilPainting.jpeg";
        HsyOpencvUtils.oilPaintingOperation( imagePath,outputPath );
    }
}