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i need to cut my image and now i am using crop of numpy like that a[a.shape[0] // 2:a.shape[0], :] , there is a faster function or faster processing way to cut the image ? thanks very much

i need to cut my image and now i am using crop of numpy like that a[a.shape[0] // 2:a.shape[0], :] , there is a faster function or faster processing way to cut the image ? thanks very much