Help: understanding wedge operator with matrices

Hi, I have a small problem that need your help.
While reading a reference paper for my thesis, I saw a formula as shown in this picture:

\[ \DeclareMathOperator{Mask}{Mask\,} \Mask = \Mask + (D_{t-1}) \land (D_t) \]

where $\DeclareMathOperator{Mask}{Mask\,} \Mask , D_t$ and $D_{t-1}$ are all matrices which have the same dimension. However, I don't understand what the wedge operator means. What exactly do I have to do with the two matrices $D_t$ and $D_{t-1}$ ?

FYI: this is formula is used in a background subtraction algorithm, $D_t$ and $D_{t-1}$ are images at different time.

Thanks and I really need to figure this out soon.

#Algebra

Easy Math Editor

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Math	Appears as
Remember to wrap math in `\(` ... `\)` or `\[` ... `\]` to ensure proper formatting.
`2 \times 3`	$2 \times 3$
`2^{34}`	$2^{34}$
`a_{i-1}`	$a_{i-1}$
`\frac{2}{3}`	$\frac{2}{3}$
`\sqrt{2}`	$\sqrt{2}$
`\sum_{i=1}^3`	$\sum_{i=1}^3$
`\sin \theta`	$\sin \theta$
`\boxed{123}`	$\boxed{123}$