BinaryImageQ
BinaryImageQ[image] yields True if image has the form of a binary Image or Image3D object, and False otherwise.
Examples
Test binary image:
img = Binarize[ExampleData[{"TestImage", "Lena"}]];
BinaryImageQ[img]
(* True *)Test non-binary image:
BinaryImageQ[ExampleData[{"TestImage", "Lena"}]]
(* False *)Please visit the official Wolfram Language Reference for more details.