Java图片比对算法
天生要强注定要凉 人气:0采用直方图原理算法比对图片的细微差别效果比较好,以下两张区别很小的图片识别效果如下:
识别结果:
主要代码如下:
import javax.imageio.*; import java.awt.image.*; import java.awt.*; import java.io.*; public class PhotoDigest { public static void main(String[] args) throws Exception { float percent = compare(getData("/Users/sun/Downloads/1.jpg"), getData("/Users/sun/Downloads/3.jpg")); if (percent == 0) { System.out.println("无法比较"); } else { System.out.println("两张图片的相似度为:" + percent + "%"); } } public static int[] getData(String name) { try { BufferedImage img = ImageIO.read(new File(name)); BufferedImage slt = new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB); slt.getGraphics().drawImage(img, 0, 0, 100, 100, null); // ImageIO.write(slt,"jpeg",new File("slt.jpg")); int[] data = new int[256]; for (int x = 0; x < slt.getWidth(); x++) { for (int y = 0; y < slt.getHeight(); y++) { int rgb = slt.getRGB(x, y); Color myColor = new Color(rgb); int r = myColor.getRed(); int g = myColor.getGreen(); int b = myColor.getBlue(); data[(r + g + b) / 3]++; } } // data 就是所谓图形学当中的直方图的概念 return data; } catch (Exception exception) { System.out.println("有文件没有找到,请检查文件是否存在或路径是否正确"); return null; } } public static float compare(int[] s, int[] t) { try { float result = 0F; for (int i = 0; i < 256; i++) { int abs = Math.abs(s[i] - t[i]); int max = Math.max(s[i], t[i]); result += (1 - ((float) abs / (max == 0 ? 1 : max))); } return (result / 256) * 100; } catch (Exception exception) { return 0; } } }
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