$H F I D (S_{i}^{f}, E_{i}^{n}, R, F)$

输入： $S_{i}^{f}$ 是基准图像， $E_{i}^{n}$ 是视频连续四帧灰度图像，R是基于SIFT算法特征匹配像素点占比，F是监控视频图像总帧数

输出：监控视频动态目标区域 $D_{f}$

1 for $i = 1$ to F do

2 $A^{'} \leftarrow E_{i}^{n} R$

3 $B^{'} \leftarrow E_{i}^{n} (1 - R)$

4 $T_{\max}^{i} \leftarrow \max (o t s u (B^{'}, T_{i}), o t s u (E_{i}^{n} S_{i}^{f} A^{'}, T_{i}), o t s u (E_{i}^{n} S_{i}^{f} B^{'}, T_{i}))$

5 $d_{i} \leftarrow E_{i}^{n} - R E_{i - 1}^{n}$

6 if $d_{i} \geq T_{\max}^{i}$

7 then ${d^{'}}_{i} \leftarrow 1$

8 $T r e_{i}^{n} \leftarrow t h r e s h o l d ({d^{'}}_{i}), c_{i} \leftarrow o r F u n (T r e_{i}^{n})$

9 $D_{i} \leftarrow m o r p h o l o g y I m a g e (c_{i})$

10 else ${d^{'}}_{i} \leftarrow 0$

11 $D_{f} \leftarrow {d^{'}}_{i}$

12 end for

13 return $D_{f}$