.ENTER IMAGE NUMBERS: 1-40,45,50-70
[Self-explanatory. If the data are supplied as a 3D
stack, then the numbers are interpreted as slice numbers.
If the 'R' (Random) option is used (see below), then
the total number of images to be created is determined
by the sequence entered here, although only the first
file need be supplied.]
.MASK FILE: MAS002
[Enter the name of the file containing the mask. Only
image pixels where mask pixels are greater than 0.5 are
analyzed in CORAN and PCA.
The mask address array is stored as part of the sequential
file. It allows the user to recover the original [masked]
images or to reconstitute images using selected factors
(see also 'CA SR').
Current limitation for total number of pixels in mask: 4000.]
.SEQUENCE FILE: SEQ001
[Enter the name of the sequential file where data are
to be stored.]
.ALL FILES EXIST (Y/N), (I)NV, (R)ANDOM: Y
[Options are read in as string; e.g., 'YI' or 'NR'.
If all files in the sequence specified exist, enter 'Y'.
If there are any gaps, enter 'N'.
The 'I' option is used to invert the contrast of the images
as they are being read in.
The 'R' option is used to create an image set by successive
random permutations, starting with the first image. Only the
first image of the sequence needs to exist; it is the only
one used in this computation.]
.ADDITIVE CONSTANT: 0.0
[If your images have negative values, this can be corrected by
specifying an additive constant that will be added to all
(within-mask) pixels of all images]. The smallest additive
constant needed to achieve positivity will be printed. Unlike
CORAN, PCA does accept negative pixel values (in images); thus,
it is not necessary to add a constant (although it will be
displayed).
NOTES