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112 Chapter 3 ■ Digital Morphology

OPERATOR LEFT RIGHT RESULT DESCRIPTION

<- pixel image image Translate the image by the
pixel.

@ pixel image int Membership: Is the pixel in
the image?
[] [int, int] Pixel generator. Result is the
pixel whose row is the first int
and whose column is the
second int.

. image.rows Each image has 4 attributes:
image.cols number of rows and
image columns, and the row and
.origin_x column locations of the
image origin. These can be accessed
.origin_y by imagename.attrname.

. pixel.row Each pixel has two attributes:
pixel.col the row and column indices.
UNARY OPERATORS

∼ Set complement.
! Allocate a new image like the
given one.
# The (integer) number of
isolated pixels in an image.
- Integer negation.
IMAGE GENERATOR

{PIXEL1, PIXEL2, ‘‘0110101 ... ’’} Generates an image, whose
size is given by PIXEL1, whose
origin is given by PIXEL2, and
whose pixels are specified by
the string.

Parentheses can be used in expressions to specify the order of evaluation.
There is no precedence implicit in the operators other than that unary oper-
ators will be computed before binary ones, and evaluation is otherwise left
to right.
There is a collection of test programs named t1.max through t30.max;any
MAX program must have the .max suffix. Running the compiler is quite simple.
It used to run from the command line, but it is rare these days to run from the