? ? ? ??圖像打碼其實也是圖像卷積操作中，空間域濾波的一種方式，用一定大小的濾波器對馬賽克范圍內像素進行操作。實現過程：將需要打馬范圍按照濾波器大小劃分為多個區塊，取濾波器范圍內像素，求取均值，再將均值賦值給范圍內每一個像素，濾波器再滑到下一個區塊。從原理上看，圖像馬賽克特效非常簡單，下面就來看一下具體實現過程。

? ? ? ??對整張圖像打碼。對整張圖片打碼也叫做像素格特效，我們只需要考慮濾波器大小即可。

? ? ? ? 代碼：

/*** 對整個圖片打碼* @param image* @param length 馬賽克大小*/ public void imageMosaic(BufferedImage image,int length) {int width = image.getWidth();int height = image.getHeight();int size = length * length;int x = width / length;int y = height / length;for(int i = 0; i < x; i++) {for(int j = 0; j < y; j++) {int R=0,G=0,B=0;for(int m = 0; m < length; m++) {for(int n = 0; n < length; n++) {int xCoordinate = i * length + m;int yCoordinate = j * length + n;int rgb = image.getRGB(xCoordinate, yCoordinate);R += (rgb >> 16) & 0xff;G += (rgb >> 8) & 0xff;B += rgb & 0xff;}}R = R / size;G = G / size;B = B / size;int RGB = (255 & 0xff) << 24 | (clamp(R) & 0xff) << 16 | (clamp(G) & 0xff) << 8 | (clamp(B) & 0xff);for(int m = 0; m < length; m++) {for(int n = 0; n < length; n++) {int xCoordinate = i * length + m;int yCoordinate = j * length + n;image.setRGB(xCoordinate, yCoordinate, RGB);}}}}}

局部打碼。局部打碼需要先定義好打碼起始位置，打碼范圍，馬賽克大小。

代碼：

/*** 局部打碼* @param image* @param xCoordinate 橫坐標起始位置* @param yCoordinate 縱坐標起始位置* @param xLength x方向長度* @param yLength y方向長度* @param length 馬賽克大小*/public void mosaic(BufferedImage image,int xCoordinate,int yCoordinate,int xLength,int yLength,int length) {if ((xCoordinate + xLength) > image.getWidth() || (yCoordinate + yLength) > image.getHeight()) {System.out.println("馬賽克范圍大于圖像范圍！");return;}int size = length * length;int x = xLength / length;int y = yLength / length;for(int m = 0; m < x; m++) {for(int n = 0; n < y; n++) {int R=0,G=0,B=0;for(int i = 0; i < length; i++) {for(int j = 0; j < length; j++) {int x1 = xCoordinate + m * length + i;int y1 = yCoordinate + n * length + j;int rgb = image.getRGB(x1, y1);R += (rgb >> 16) & 0xff;G += (rgb >> 8) & 0xff;B += rgb & 0xff;}}R = R / size;G = G / size;B = B / size;int RGB = (255 & 0xff) << 24 | (clamp(R) & 0xff) << 16 | (clamp(G) & 0xff) << 8 | (clamp(B) & 0xff);for(int i = 0; i < length; i++) {for(int j = 0; j < length; j++) {int x1 = xCoordinate + m * length + i;int y1 = yCoordinate + n * length + j;image.setRGB(x1, y1, RGB);}}}}}

? ? ? ??完整的馬賽克實現代碼：

public class MosaicFilter {/*** 對整個圖片打碼* @param image* @param length 馬賽克大小*/public void imageMosaic(BufferedImage image,int length) {int width = image.getWidth();int height = image.getHeight();int size = length * length;int x = width / length;int y = height / length;for(int i = 0; i < x; i++) {for(int j = 0; j < y; j++) {int R=0,G=0,B=0;for(int m = 0; m < length; m++) {for(int n = 0; n < length; n++) {int xCoordinate = i * length + m;int yCoordinate = j * length + n;int rgb = image.getRGB(xCoordinate, yCoordinate);R += (rgb >> 16) & 0xff;G += (rgb >> 8) & 0xff;B += rgb & 0xff;}}R = R / size;G = G / size;B = B / size;int RGB = (255 & 0xff) << 24 | (clamp(R) & 0xff) << 16 | (clamp(G) & 0xff) << 8 | (clamp(B) & 0xff);for(int m = 0; m < length; m++) {for(int n = 0; n < length; n++) {int xCoordinate = i * length + m;int yCoordinate = j * length + n;image.setRGB(xCoordinate, yCoordinate, RGB);}}}}}/*** 局部打碼* @param image* @param xCoordinate 橫坐標起始位置* @param yCoordinate 縱坐標起始位置* @param xLength x方向長度* @param yLength y方向長度* @param length 馬賽克大小*/public void mosaic(BufferedImage image,int xCoordinate,int yCoordinate,int xLength,int yLength,int length) {if ((xCoordinate + xLength) > image.getWidth() || (yCoordinate + yLength) > image.getHeight()) {System.out.println("馬賽克范圍大于圖像范圍！");return;}int size = length * length;int x = xLength / length;int y = yLength / length;for(int m = 0; m < x; m++) {for(int n = 0; n < y; n++) {int R=0,G=0,B=0;for(int i = 0; i < length; i++) {for(int j = 0; j < length; j++) {int x1 = xCoordinate + m * length + i;int y1 = yCoordinate + n * length + j;int rgb = image.getRGB(x1, y1);R += (rgb >> 16) & 0xff;G += (rgb >> 8) & 0xff;B += rgb & 0xff;}}R = R / size;G = G / size;B = B / size;int RGB = (255 & 0xff) << 24 | (clamp(R) & 0xff) << 16 | (clamp(G) & 0xff) << 8 | (clamp(B) & 0xff);for(int i = 0; i < length; i++) {for(int j = 0; j < length; j++) {int x1 = xCoordinate + m * length + i;int y1 = yCoordinate + n * length + j;image.setRGB(x1, y1, RGB);}}}}}// 判斷r,g,b值，大于256返回256，小于0則返回0,0到256之間則直接返回原始值private int clamp(int rgb) {if (rgb > 255)return 255;if (rgb < 0)return 0;return rgb;}public static void main(String[] args) throws Exception{File in = new File("C:/Users/admin/Desktop/1.jpg");File out = new File("C:/Users/admin/Desktop/3.jpg");BufferedImage image = ImageIO.read(in);new MosaicFilter().imageMosaic(image, 5);//new MosaicFilter().mosaic(image, 100, 70, 50, 50,10);ImageIO.write(image, "jpg", out);} }

? ? ? ? ? 原圖：

? ? ? ? 全局打碼：

? ? ? ? 局部打碼：

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