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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.

Note by Ngoc Anh
9 months, 3 weeks ago