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Func_liveness_detection.c
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#include <stdio.h>
#include <time.h>
#include <math.h>
#include <stdbool.h>
#include <stdlib.h>
/* 函数声明 */
bool liveness_detection(char *DeepFile, int rec_face[4]);
// Eg:rec_face = {157 ,66 ,172 ,198 }, 行取66：66+198,列取157：157+172
int main()
{
/* 局部变量定义 */
char *DeepFile = "/home/zhoujie/liveness detection/raw文件/non-face/18.raw";
int rec_face[4] = {85 ,162 ,172 ,181};
bool IS_FACE;
/* 调用函数判断是否为活体 */
IS_FACE = liveness_detection( DeepFile, rec_face);
printf("%d\n", IS_FACE);
}
/* 函数判断是否为活体 */
bool liveness_detection(char *DeepFile, int rec_face[4])
{
const int IMG_HEIGHT = 345;
const int IMG_WIDTH = 400;
const int ITER = 10000; // 随机取点次数
const float PLANE_OR_NOT = 0.1; // 判断是否为平面的分界线
const int SIGMA = 1;
typedef unsigned short UNIT16;
// 从.raw读取二进制16位数据到MatDATA
UNIT16 MatDATA[IMG_HEIGHT*IMG_WIDTH];
FILE *fp = NULL;
fp = fopen( DeepFile, "rb" );
fread(MatDATA,sizeof(UNIT16),IMG_HEIGHT*IMG_WIDTH,fp);
fclose(fp);
// int length = sizeof(MatDATA) / sizeof(UNIT16);
// printf("数组的长度为: %d\n",length); //length 应为IMG_HEIGHT*IMG_WIDTH
// DeepDATA三行分别为深度图行数，列数，深度信息
// int DeepDATA[3][IMG_HEIGHT*IMG_WIDTH];
int n = 0;
int i,j;
// for(i=1;i< IMG_HEIGHT+1 ;i++)
// {
// for(j=1;j< IMG_WIDTH+1 ;j++)
// {
// DeepDATA[0][n] = i;
// DeepDATA[1][n] = j;
// DeepDATA[2][n] = MatDATA[n];
// n += 1;
// }
// }
// int test1 = 110194 ;
// printf("%d,%d,%d\n",DeepDATA[0][test1],DeepDATA[1][test1],DeepDATA[2][test1]);
// FaceDATA为深度图DeepDATA裁剪后且去除零深度信息后的人脸部分
int COL = rec_face[0],ROW = rec_face[1],FACE_WIDTH = rec_face[2],FACE_HEIGHT = rec_face[3]; //位置信息
// txt :157 66 172 198 , 取行66：66+198,列取157：157+172
int FaceDATA[3][FACE_HEIGHT*FACE_WIDTH];
int faceno0_num = FACE_HEIGHT*FACE_WIDTH -1;
n = 0;
for(i = 1;i< FACE_HEIGHT+1;i++)
{
for(j= 1;j< FACE_WIDTH+1;j++)
{
if (MatDATA[IMG_WIDTH*(ROW+i-2)+COL+j-2] == 0)
{
faceno0_num -= 1; // 非零深度点个数为 faceno0_num+1
continue;
}
FaceDATA[0][n] = i;
FaceDATA[1][n] = j;
FaceDATA[2][n] = MatDATA[IMG_WIDTH*(ROW+i-2)+COL+j-2];
n += 1;
}
}
// int test = 6804;
// printf("%d,%d,%d,%d\n",test,FaceDATA[0][test],FaceDATA[1][test],FaceDATA[2][test]);
int pretotal = 0; // 符合拟合模型的数据的个数
int x[3],y[3],z[3]; // 随机取三个点
srand((unsigned)time(NULL));
float a,b,c; // 拟合平面方程 z=ax+by+c
// float besta,bestb,bestc; // 最佳参数
int rand_num[3];
float check,distance;
int total = 0;
for(i = 0; i < ITER; i++)
{
do{
rand_num[0] = rand()%faceno0_num;
rand_num[1] = rand()%faceno0_num;
rand_num[2] = rand()%faceno0_num;
}while(rand_num[0] == rand_num[1] || rand_num[0] == rand_num[2] || rand_num[1] == rand_num[2]);
for(n = 0; n < 3; n++ )
{
x[n] = FaceDATA[0][rand_num[n]];
y[n] = FaceDATA[1][rand_num[n]];
z[n] = FaceDATA[2][rand_num[n]];
// printf("%d,%d,%d,%d\n", x[n],y[n],z[n],n);
}
check = (x[0]-x[1])*(y[0]-y[2]) - (x[0]-x[2])*(y[0]-y[1]);
if ( check == 0) // 防止提示浮点数例外 (核心已转储)
{
i -= 1;
continue;
}
a = ( (z[0]-z[1])*(y[0]-y[2]) - (z[0]-z[2])*(y[0]-y[1]) )/( (x[0]-x[1])*(y[0]-y[2]) - (x[0]-x[2])*(y[0]-y[1]) );
if (y[0] == y[2]) // 防止提示浮点数例外 (核心已转储)
{
i -= 1;
continue;
}
b = ((z[0] - z[2]) - a * (x[0] - x[2]))/(y[0]-y[2]);
c = z[0]- a * x[0] - b * y[0];
// printf("%f,%f,%f\n",a,b,c);
total = 0;
for(n = 0; n < faceno0_num +1 ; n++ )
{
distance = fabs(a*FaceDATA[0][n] + b*FaceDATA[1][n] - 1*FaceDATA[2][n] + c*1);
if (distance < SIGMA)
{
total +=1;
}
}
// printf("%d,%f,%d\n",i,distance,total);
if (total > pretotal) // 找到符合拟合平面数据最多的拟合平面
{
pretotal=total;
// besta = a;
// bestb = b;
// bestc = c;
}
}
float pretotal_ary = pretotal *1.0/ faceno0_num ;
// printf("%d,%f\n", pretotal,pretotal_ary);
bool IS_FACE;
if (pretotal_ary>PLANE_OR_NOT)
{
IS_FACE = true;
// printf("是人脸");
}
else
{
IS_FACE = false;
// printf("不是人脸");
}
// printf("%d\n", IS_FACE);
return IS_FACE;
}