Comparison of Java pictures

Import Javax.imageio.imageio;import java.awt.*;import Java.awt.image.bufferedimage;import Java.io.File;import Java.io.ioexception;import Java.text.decimalformat;public class Imagediff {//different pixels marked red public static final int RGB    _red = 16711680;    allowable pixel difference of red,green,blue single dimension public static final int diff_allow_range = 5;    Statistical value of different pixel points public static int diffpointcount = 0;    Extract red public static int getred (int rgbvalue) from RGB values {return Rgbvalue & 0xff0000 >> 16;    }//Extract green public static int getgreen (int rgbvalue) from RGB values {return Rgbvalue & 0xff00 >> 8;    }//Extract the blue public static int getBlue (int rgbvalue) from the RGB values {return rgbvalue & 0xFF; }/** * Compare two pictures, mark different pixels with red, then save the difference picture to local, print match rate * @param srcimgpath * @param targetimgpath * * Public St atic void Compareimages (String srcimgpath,string targetimgpath) {try {bufferedimage srcimg = imageio.re            AD (new File (Srcimgpath)); BUfferedimage targetimg = Imageio.read (new File (Targetimgpath));            Diffpointcount = 0;            BufferedImage diffimg = srcimg;            int srcheight = Srcimg.getheight ();            int srcwidth = Srcimg.getwidth ();            Modify the dimensions of the image to be compared to fit the size of the source image targetimg = Changeimagesize (targetimg,srcheight,srcwidth);            int Srcrgb;            int Targetrgb; for (int h = 0;h<srcheight;h++) {for (int w=0;w<srcwidth;w++) {Srcrgb = SRCIMG.GETRG                    B (W,H);                    Targetrgb = Targetimg.getrgb (w,h);                            if (Math.Abs (getred (SRCRGB)-getred (TARGETRGB)) >diff_allow_range | |                            Math.Abs (Getgreen (SRCRGB)-Getgreen (TARGETRGB)) >diff_allow_range| |                        Math.Abs (GetBlue (SRCRGB)-GetBlue (TARGETRGB)) >diff_allow_range) {Diffimg.setrgb (w,h, rgb_red);                    diffpointcount++;       }                }     }//Save diff picture Imageio.write (diffimg, "JPG", New File ("diffimg.jpg")); System.out.println ("Save diff picture Success!")            ");            Calculates the similarity (retains four digits after the decimal point) int totalpixel = Srcheight*srcwidth;            DecimalFormat DecimalFormat = new DecimalFormat ("#.####");            Double matchrate = (totalpixel-diffpointcount)/(totalpixel*1.0);        System.out.println ("Picture similarity:" +decimalformat.format (matchrate) + "%");        }catch (Exception ex) {ex.printstacktrace ();  }}/** * Modify the image size in BufferedImage to compare with the source image * @param image * @param newheight * @param newwidth * @return */public static bufferedimage changeimagesize (bufferedimage image,int newheight,int newwidth) {Ima        GE img = image.getscaledinstance (newwidth,newheight,image.scale_smooth);        int width = img.getwidth (null);        int height = img.getheight (null); Gets the BufferedImage instance of the new picture bufferedimage newbufferedimage = new BufferedImage (width, Height, bufferedimage.type_int_argb);        Graphics g = newbufferedimage.getgraphics ();        G.drawimage (IMG, 0, 0, NULL);        G.dispose ();    return newbufferedimage;    } public static void Main (string[] args) {compareimages ("1.jpg", "2.jpg"); }}

　　

Comparison of Java pictures