MM C - Mask Multiplication - Continuous

PURPOSE

Apply mask with soft edges to images or volumes according to a reference file.

SEE ALSO

MA	[Mask - image using circular mask]
MM	[Mask Multiplication]

USAGE

.OPERATION: MM C

.MASK REFERENCE FILE: MAS002
[Enter mask reference file containing values between 0.0 and 1.0 (inclusive)]

.IMAGE (OVERWITTEN!) FILE: PIC001
[Enter name of image/volume file to be masked.]

NOTES

1. The image/volume will be overwritten by the masked one.

2. Effects of the mask: Values in the file are A. Unchanged wherever the mask file has the value 1.0
   B. Changed to the file average 'AV' wherever the mask file has the value 0.0
   C. Altered at the mask edges wherever the value is between 0 and 1, according to the following formula:
   ' NEW(K,I) = [OLD(K,I) - OLDAV] * MASK(K,I) + OLDAV
   where:
      'NEW'   is masked image/volume.
      'OLD'   is unmasked image/volume.
      'MASK'  is continuous-valued mask function
      'OLDAV' is average value of old, unmasked image/volume.
   

SUBROUTINES

MASKMU

CALLER

UTIL2