<> === 开运算和闭运算 === A与B的开运算定义为：{{{#!latex $$A\circ B = (A \ominus B) \oplus B$$ }}} A与B的闭运算定义为：{{{#!latex $$A\bullet B = (A \oplus B)\ominus B$$ }}} {{attachment:../figure99.png}} 在matlab中实现：{{{ C = imopen(A, B) C = imclose(A, B) }}} {{attachment:../figure910.png}} {{attachment:../figure911.png}} <>