Digital Signal Processing Reference
In-Depth Information
Realize that the key point of DP algorithm and MSHT algorithm in detection is in-
tegrating the energy of dim-small target to enhance the SNR of IR image sequence, so
the grayscale accumulation threshold acquired by MSHT also applies to DP
algorithm.
Fig. 8.
The principle of DP-MSHT algorithm
A hypothesis testing threshold is brought into the DP energy accumulation process
after combining with the MSHT algorithm in our work. For example, as shown in
figure 8, define
E
k
) frames,
for a certain pixel node {1} in the
k
th frame, there are 4 valid energy nodes, labeled as
{2, 3, 4, and 5} according to the status transition law. Integrate the maximum energy
node {3} among the four valid energy nodes with the current pixel node {1}. The
energy of node {1} is accumulated while the integrated value exceeds a certain accu-
mulated energy threshold
as the accumulated energy matrix for the prior (
1
k
−
1
V
; otherwise the energy of node {1} turns to 0. Thus, the
E
in equation (8) is redefined as:
k
th accumulated energy
{
max(
E
(
X
)
+
Z
(
X
))
E
(
X
)
+
Z
(
X
)
>
V
k
−
1
k
−
1
k
k
−
1
k
−
1
k
T
E
=
(17)
X
∈
D
(
k
−
1
)
X
∈
D
(
k
−
1
)
k
−
1
k
−
1
k
0
E
(
X
)
+
Z
(
X
)
<
V
k
−
1
k
−
1
k
T
X
∈
D
(
k
−
1
)
k
−
1
