如何使用java比较图像的相似性

Question

最近我有机会与图像处理技术合作，作为我的一个项目的一部分，我的任务是在给出新图像时从图像存储库中找到匹配的图像。我开始使用Google搜索“如何使用Java比较图像”来开始我的项目，并且我找到了一些关于找到两幅图像相似性的好文章。几乎所有的人都是基于四个基本步骤，它们分别是：

1.Locating the Region of Interest (Where the Objects appear in the given image), 
2.Re-sizing the ROIs in to a common size, 
3.Substracting ROIs, 
4.Calculating the Black and White Ratio of the resultant image after subtraction. 

虽然这听起来是一个很好的算法来比较图像，它需要在我的项目中使用JAI实施之后相当长的时间。因此我必须找到一种替代方法。

有什么建议吗？

Answer 1

根据不同的图像，你可以做这样的事情（伪代码）。这是非常原始的，但应该是非常有效的。你可以通过采用随机或图案像素而不是每个像素来加速它。

for x = 0 to image.size: 
    for y = 0 to image.size: 
     diff += abs(image1.get(x,y).red - image2.get(x,y).red) 
     diff += abs(image1.get(x,y).blue - image2.get(x,y).blue) 
     diff += abs(image1.get(x,y).green - image2.get(x,y).green) 
    end 
end 

return ((float)(diff))/(x * y * 3) 

Answer 2

**// This API will compare two image file // 
// return true if both image files are equal else return false//** 
public static boolean compareImage(File fileA, File fileB) {   
    try { 
     // take buffer data from botm image files // 
     BufferedImage biA = ImageIO.read(fileA); 
     DataBuffer dbA = biA.getData().getDataBuffer(); 
     int sizeA = dbA.getSize();      
     BufferedImage biB = ImageIO.read(fileB); 
     DataBuffer dbB = biB.getData().getDataBuffer(); 
     int sizeB = dbB.getSize(); 
     // compare data-buffer objects // 
     if(sizeA == sizeB) { 
      for(int i=0; i<sizeA; i++) { 
       if(dbA.getElem(i) != dbB.getElem(i)) { 
        return false; 
       } 
      } 
      return true; 
     } 
     else { 
      return false; 
     } 
    } 
    catch (Exception e) { 
     System.out.println("Failed to compare image files ..."); 
     return false; 
    } 
} 

Answer 3

这个API将比较两个图像文件，并返回相似的

public float compareImage(File fileA, File fileB) { 

    float percentage = 0; 
    try { 
     // take buffer data from both image files // 
     BufferedImage biA = ImageIO.read(fileA); 
     DataBuffer dbA = biA.getData().getDataBuffer(); 
     int sizeA = dbA.getSize(); 
     BufferedImage biB = ImageIO.read(fileB); 
     DataBuffer dbB = biB.getData().getDataBuffer(); 
     int sizeB = dbB.getSize(); 
     int count = 0; 
     // compare data-buffer objects // 
     if (sizeA == sizeB) { 

      for (int i = 0; i < sizeA; i++) { 

       if (dbA.getElem(i) == dbB.getElem(i)) { 
        count = count + 1; 
       } 

      } 
      percentage = (count * 100)/sizeA; 
     } else { 
      System.out.println("Both the images are not of same size"); 
     } 

    } catch (Exception e) { 
     System.out.println("Failed to compare image files ..."); 
    } 
    return percentage; 
}