C/C++ opencv 计算 LBP特征包括旋转不变 uniform 圆形邻域

话不多说直接上代码，没有做直方图的统计，没有做cell的归一化，请自行完成。

#include  <iostream>
#include <opencv.hpp>
#define pi 3.1415926
using namespace std;
using namespace cv;int binary2decimal(char descri[], int p)
{
//char a[8] = { 1,1,0,0,0,0,0,0};
//cout << binary2decimal(a, 8) << endl;
// -> 3int sum = 0, factorial = 1;for (int i = 0; i < p; i++){sum += factorial * descri[i];factorial = factorial * 2;}return sum;
}
void show(Mat img, string name = "1")
{Mat temp;img.convertTo(temp, CV_8U);imshow(name, temp);waitKey();
}
int LBPRotate(char descri[], int p)
{char *temp = new char[p];int min = binary2decimal(descri, p);for (int epo = 0; epo < p; epo++){for (int i = 0; i < p; i++){temp[i] = descri[(i + epo) % p];}if (binary2decimal(temp, p) < min)min = binary2decimal(temp, p);}return min;
}
void uniformpattern(char descri[], int p)
{char pre = descri[0];char change = 0;for (int i = 1; i < p; i++){if (descri[i] != pre){change++;}}if (change > 2){for (int i = 1; i < p; i++){descri[i] = 0;}}
}
char* LBPCircle(Mat src, int x, int y, int P, float R)
{char* descriptor = new char[P];int height = src.rows;int width = src.cols;float angle, px, py;for (int i = 0; i < P; i++){angle = pi / 2 - 2 * pi / P * i;px = (float)x + R * cos(angle);py = (float)y - R * sin(angle);if (px <= 0 || py <= 0 ||px >= width - 1 || py >= height - 1){for (int m = 0; m < P; m++){descriptor[m] = 0;}return descriptor;}else{int xl = int(px);int xr = xl + 1;int yl = int(py);int yr = yl + 1;float wxl = 1 - (px - xl);float wxr = 1 - (xr - px);float wyl = 1 - (py - yl);float wyr = 1 - (yr - py);float pixel = src.at<float>(yl, xl) * (wxl + wyl) +src.at<float>(yr, xl) * (wxl + wyr) +src.at<float>(yl, xr) * (wxr + wyl) +src.at<float>(yr, xr) * (wxr + wyr);pixel /= 4.0;if (pixel > src.at<float>(y, x))descriptor[i] = 1;elsedescriptor[i] = 0;}}return descriptor;
}
char* LBPBase(Mat src, int x, int y)
{char* descriptor = new char[8];float center, pixel;int width = src.cols;int height = src.rows;char dxdy[8][2] = { -1,-1,   0,-1,   1,-1,1,0,   1,1,    0,1,    -1,1,   -1,0 };if (x == 0 || y == 0 || x == width - 1 || y == height - 1){for (int m = 0; m < 8; m++){descriptor[m] = 0;}return descriptor;}center = src.at<float>(y, x);for (int m = 0; m < 8; m++){pixel = src.at<float>(y + dxdy[m][1], x + dxdy[m][0]);if (pixel > center)descriptor[m] = 1;elsedescriptor[m] = 0;}return descriptor;
}void LBP(InputArray src, OutputArray dst, bool rotate = true, bool uniform = true, bool base = true, int P = 8, float R = 1)
{Mat input = src.getMat();dst.create(input.size(), CV_8UC1);Mat output = dst.getMat();int width = input.cols;int height = input.rows;//颜色空间归一化input.convertTo(input, CV_32F);Mat gray = Mat::zeros(input.size(), CV_32FC1);float r, g, b;for (int i = 0; i < height; i++){for (int j = 0; j < width; j++){r = input.at<Vec3f>(i, j)[2];g = input.at<Vec3f>(i, j)[1];b = input.at<Vec3f>(i, j)[0];gray.at<float>(i, j) = 0.3 * r + 0.59 * g + 0.11 * b;}}int value;char* desc;for (int j = 0; j < width; j++){for (int i = 0; i < height; i++){   if (base)desc = LBPBase(gray, j, i);elsedesc = LBPCircle(gray, j, i, P, R);if (uniform)uniformpattern(desc, P);if (rotate)value = LBPRotate(desc, P);elsevalue = binary2decimal(desc, P);output.at<uchar>(i, j) = value;}}
}int main()
{Mat src = imread("F:\\users\\桌面\\123.jpg");resize(src, src, Size(512, 512));Mat dst;show(src);LBP(src, dst, false, false, true);show(dst, "origin");LBP(src, dst, false, false, false);show(dst, "Circle");}

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