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Chapter 3 ■ Digital Morphology 111

OPERATOR LEFT RIGHT RESULT DESCRIPTION

<> pixel pixel int Not equal, pixels.
= image image int Are LEFT and RIGHT equal?

= int int int Integer equality.
= pixel pixel pixel Pixel equality.
= image int int Are all pixels in the image
equal to the given integer?

- image image image Set difference, LEFT-RIGHT.
- int int int Integer subtraction.
- pixel pixel pixel Vector subtraction.

+ image image image Union of images LEFT and
RIGHT.
+ int int int Integer addition.

+ pixel pixel pixel Vector addition.
+ image pixel image Add a pixel to an image (set
value).
+ pixel image image Add a pixel to an image (set
value).
* image image image Intersection of LEFT and
RIGHT.

* int int int Integer multiplication.
<< image string image Read an image from a PBM
format file named by the
string.
<< int string int Read an integer.
<< pixel string pixel Read a pixel (2 ints).

>> image string image Write an image to a PBM
format file named by the
string.

>> int string int Write an integer.
>> pixel string pixel Write a pixel (2 ints).
-> image pixel image Translate the image by the
pixel.