#include "opencv2/core/core.hpp"
#include "opencv2/contrib/contrib.hpp"
#include "opencv2/highgui/highgui.hpp"

#include <iostream>
#include <fstream>
#include <sstream>

using namespace cv;
using namespace std;

void elbp(Mat& src, Mat &dst, int radius, int neighbors)
    {

    for
 
(int n=0; n<neighbors; n++)
        {
        // 取樣點的計算
        float x = static_cast<float>(-radius * sin(2.0*CV_PI*n/static_cast<float>(neighbors)));
        float y = static_cast<float>(radius * cos(2.0*CV_PI*n/static_cast<float>(neighbors)));
        // 上取整和下取整的值
        int fx = static_cast
 
<int>(floor(x));
        int fy = static_cast<int>(floor(y));
        int cx = static_cast<int>(ceil(x));
        int cy = static_cast<int>(ceil(y));
        // 小數部分
        float ty = y - fy;
        float tx = x - fx;
        // 設定插值權重
        float w1 = (1 - tx) * (1 - ty);
        float
 
 w2 =      tx  * (1 - ty);
        float w3 = (1 - tx) *      ty;
        float w4 =      tx  *      ty;
        // 迴圈處理影象資料
        for(int i=radius; i < src.rows-radius;i++)
            {
            for(int j=radius;j < src.cols-radius;j++) 
                {
                // 計算插值
                float t = static_cast<float>(w1*src.at<uchar>(i+fy,j+fx) + w2*src.at<uchar>(i+fy,j+cx) + w3*src.at<uchar>(i+cy,j+fx) + w4*src.at<uchar>(i+cy,j+cx));
                // 進行編碼
                dst.at<uchar>(i-radius,j-radius) += ((t > src.at<uchar>(i,j)) || (std::abs(t-src.at<uchar>(i,j)) < std::numeric_limits<float>::epsilon())) << n;
                }
            }
        }
    }

void elbp1(Mat& src, Mat &dst)
    {

        // 迴圈處理影象資料
        for(int i=1; i < src.rows-1;i++)
            {
            for(int j=1;j < src.cols-1;j++) 
                {
                uchar tt = 0;
                int tt1 = 0;
                uchar u = src.at<uchar>(i,j);
                if(src.at<uchar>(i-1,j-1)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i-1,j)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i-1,j+1)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i,j+1)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i+1,j+1)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i+1,j)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i+1,j-1)>u) { tt += 1 <<tt1; } 
                tt1++;
                if(src.at<uchar>(i-1,j)>u) { tt += 1 <<tt1; } 
                tt1++;

                dst.at<uchar>(i-1,j-1) = tt;
                }
            }
        }

int main()
    {
    Mat img = cv::imread("../lenna.jpg", 0);
    namedWindow("image");
    imshow("image", img);

    int radius, neighbors;
    radius = 1;
    neighbors = 8;

    //建立一個LBP
    //注意為了溢位，我們行列都在原有影象上減去2個半徑
    Mat dst = Mat(img.rows-2*radius, img.cols-2*radius,CV_8UC1, Scalar(0));
    elbp1(img,dst);
    namedWindow("normal");
    imshow("normal", dst);

    Mat dst1 = Mat(img.rows-2*radius, img.cols-2*radius,CV_8UC1, Scalar(0));
    elbp(img,dst1,1,8);
    namedWindow("circle");
    imshow("circle", dst1);

    while(1)
       cv::waitKey(0);
    }