Topic "masks"

MASKS			    Monash Image Library			MASKS

The image library supports another structure called I_MASK:

typedef struct IMASK_T
{
    long row;
    long col;
    union
    {
        char    chr;
        short   sht;
        long    lng;
        double  dbl;
    } value;
} 
IMASK;

This structure allows the image library to work with sparse structures
instead of matrices. However there is little support for this structure at
present.

Note: istructelem does not use this structure, although it is still
supported for compatibility reasons.

Related Functions

`igetmaskany`	returns the value (double) at the position in a mask
`igetmaskbpp`	returns the bits per pixel of the value in the IMASK structure.
`igetmaskchar`	returns the value (as a char) at the current position in the mask.
`igetmaskcol`	returns the offset column at the current position in the mask.
`igetmaskdouble`	returns the value (as a double) at the current position in the mask.
`igetmasklength`	returns the number of elements in the mask.
`igetmasklong`	returns the value (as a long) at the current position in the mask.
`igetmaskpix`	returns the value (int) at the position in a mask
`igetmaskpos`	returns the current position in the mask [0..nelems-1].
`igetmaskptr`	returns a pointer to the current IMASK structure.
`igetmaskrow`	returns the offset row at the current position in the mask.
`igetmaskshort`	returns the value (as a short) at the current position in the mask.
`iimtomask`	converts an image (array) into a mask (sparse). orig_row and orig_col indicate the origin's position.
`imasknext`	increments pointer and counter to next element in mask. Returns 0 if at the end of the mask
`imaskprev`	decrements pointer and counter to prev element in mask. Returns 0 if at the start of the mask
`imaskref`	sets position and pointer to the position p. Returns 0 if it fails.
`imaskstart`	adjusts pointer and counter to start of mask
`imasktoim`	converts a mask (sparse) into an image (array).
`imkmask`	create a new mask
`iputmaskany`	places row and col offsets, and the value at the current position.
`iputmaskchar`	sets the row and col offsets, and the char value at the current position.
`iputmaskdouble`	sets the row and col offsets, and the double value at the current position.
`iputmasklong`	sets the row and col offsets, and the long value at the current position.
`iputmaskpix`	places row and col offsets, and the value at the current position.
`iputmaskshort`	sets the row and col offsets, and the short value at the current position.
`istrtomask`	converts the string elem into a sparse mask space or _ indicates new row. 0 and 1 indicate values in the mask. i indicates active origin, o for a non-active origin.
`istructelem`	returns number of offsets and adjusts the offsets array for the element string. The offset array represents the rows and columns of the template. For example "010 1o1 010" is a 3x3 template with the origin at 'o'

Topic "masks"

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