A three-level representation of gray-scale image is used in order for each pixel to contain the maximum amount of structural information.
(A three-level representation of gray-scale image; is used; in order; for each pixel to contain the maximum amount of structural information) (each pixel; to contain; the maximum amount of structural information)
A three-level representation of gray-scale image each pixel
is used to contain
in order for each pixel to contain the maximum amount of structural information
the maximum amount of structural information