I want to calculate the zero crossing rate for a matrix

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Nithya SIvasamy
Nithya SIvasamy 2016-2-8
[LLr,LHr,HLr,HHr]=dwt2(Input_Im,'haar'); first_Level_Decomposition=[LLr,LHr;HLr,HHr];
Here I want to know the Zero crossing Rate of 3X3 matrix in first_Level_Decomposition.

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