新手问一个基础问题

[huanxiong4903]

在学习别人的代码的时候看到这样一行

a2=not(a1);

a1是grey scale的图像

根据编者的意思，想通过a2=not(a1);这个操作，得到a2,且a2是一个binary image

可是我在逐步测试中，发现a2=not(a1)
得到的结果全部都是 0

后续的所有针对a2的操作都没有意义了

请问这个到底应该怎样正确理解。

谢谢

[huanxiong4903]

以解决。
not -
Find logical NOT of array or scalar input
Syntax
~A
not(A)


Description
~A performs a logical NOT of input array A, and returns an array containing elements set to either logical 1 (true) or logical 0 (false). An element of the output array is set to 1 if the input array contains a zero value element at that same array location. Otherwise, that element is set to 0.

The input of the expression can be an array or can be a scalar value. If the input is an array, then the output is an array of the same dimensions. If the input is scalar, then the output is scalar.

not(A) is called for the syntax ~A when A is an object.