a system dependent number of consecutive main storage
words. There are handlers enabling soft sector addressing
with respect to direct-access storage files by relative
sector addresses 0, 1, 2, ... even if the access were
optimum only upon referencing hard sectors. Furthermore,
these handlers provide an automatic expansion on every
write function until an initially defined maximum size
is encountered if space is allocated in certain granules
rather than by being initially assigned in total, and
the file space may be considered contiguous by the pro-
grammer in this case.
There is sufficient flexibility inherent in the previous
conditions to simultaneously attain the introductory
objectieves. If upon an implementation of PODIUM a
particular equipment does not exactly meet these conditions
appropriate interfacing is feasible at a reasonable
expense.
The basic idea upon storing and retrieving information by
means of PODIUM is to have
- a one-to-one mapping between digital images and certain
direct-access storage files which are called direct-
access images or DAI's,
- for each image the corresponding image data and non-
pictorial information completely stored in its DAI.
One of the reasons is that files as they have been
previously defined are sets of data which can be manipu-
lated by every operating system thus providing an easy
means of saving to tape or restoring from tape at almost
every stage of an image analysis procedure without any
loss of information. (Obviously this stimulates to going
image data base.)
storage
A
method
purpose À
— 4 4 gn
e. qm ]/ —
E >
image window relation
Classification of types of information.