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.

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