如何将GLCM的C ++实现转换为Java? [英] How to convert C++ implementation of GLCM into Java?
问题描述
我从GitHub获得了以下代码片段来计算灰色通过OpenCV的级别共生矩阵(GLCM):
I got the following snippet from GitHub to compute the gray level co-occurrence matrix (GLCM) through OpenCV:
float energy=0,contrast=0,homogenity=0,IDM=0,entropy=0,mean1=0;
int row=img.rows,col=img.cols;
Mat gl=Mat::zeros(256,256,CV_32FC1);
//creating glcm matrix with 256 levels,radius=1 and in the horizontal direction
for(int i=0;i<row;i++)
for(int j=0;j<col-1;j++)
gl.at<float>(img.at<uchar>(i,j),img.at<uchar>(i,j+1))=gl.at<float>(img.at<uchar>(i,j),img.at<uchar>(i,j+1))+1;
// normalizing glcm matrix for parameter determination
gl=gl+gl.t();
gl=gl/sum(gl)[0];
上面的代码是用C ++编写的。我需要将其转换为Java但我仍然坚持这一行:
The code above is in C++. I need to convert this into Java but I'm stuck in this line:
gl.at<float>(img.at<uchar>(i,j),img.at<uchar>(i,j+1))=gl.at<float>(img.at<uchar>(i,j),img.at<uchar>(i,j+1))+1;
有人能帮帮我吗?
推荐答案
计算 256x256
图像的对称灰度共生矩阵<$ c对应于偏移向右一个像素的$ c> img (类 Mat
)可以通过OpenCV在Java中实现,如下所示:
The calculation of a 256x256
symmetric gray level co-occurrence matrix of image img
(of class Mat
) corresponding to an offset "one pixel to the right" may be implemented in Java through OpenCV as follows:
Mat gl = Mat.zeros(256, 256, CvType.CV_64F);
Mat glt = gl.clone();
for (int y = 0; y < img.rows(); y++) {
for (int x = 0; x < img.cols()-1; x++) {
int i = (int) img.get(y, x)[0];
int j = (int) img.get(y, x + 1)[0];
double[] count = gl.get(i, j);
count[0]++;
gl.put(i, j, count);
}
}
Core.transpose(gl, glt);
Core.add(gl, glt, gl);
Scalar sum = Core.sumElems(gl);
Core.divide(gl, sum, gl);
有很多公开可用的库来计算GLCM并从Java中提取Haralick功能,例如 GLCM2 , JFeatureLib 等。
There is a good bunch of publicly available libraries to compute GLCMs and extract Haralick features from them in Java, for example GLCM2, JFeatureLib, etc.
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