based on two-dimensional image is improved to combine the
three-dimensional depth data .
运动历史图像作为时间差分法的一个分支,时间差分法是将连续
的图像序列中比较两个或者三个相邻帧对应像素点发生的相对变化,
得到差分图像进而阈值化来提取图像中的运动区域。本文引入三维深
度数据,所以采用改进后的差分方法如下:
The motion history image is a branch of time difference
method,the method is to get different image by a continuous
image sequence comparisons between two or three adjacent pixels
corresponding to the frame ,then to threshold to extract moving
regions in an image.This paper introduced the 3D data, the
improved differential method is as follows:
𝒟
(
x,y,z,n
)
= ℐ
(
x,y,z,n − 1
)
− 2ℐ
(
x,y,z,n
)
+ ℐ(x,y,z,n + 1)
其中:ℐ
(
x,y,z,n
)
表示第n帧图像中三维空间位置
(
x,y,z
)
处的像素
灰度值,𝒟
(
x,y,z,n
)
是连续 3 帧差分后的结果,代表了人体肢体动作
发生变化的区域,将𝒟
(
x,y,z,n
)
阈值化如下:
Among them,ℐ
(
x,y,z,n
)
represents the Pixel gray value in the
position (x,y,z) in three dimensional space, 𝒟
(
x,y,z,n
)
is the
result of the three consecutive frames difference and it also
represents human body movement changed area.The threshold of
𝒟
(
x,y,z,n
)
is as follows:
ℬ
(
x,y,z,n
)
=
{
1𝒟
(
𝑥,𝑦,𝑧,𝑛
)
> Γ
0𝑜𝑡ℎ𝑒𝑟𝑤𝑖𝑠𝑒
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