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Proceedings of the Symposium on Progress in Data Processing and Analysis

Figure 3.-IDPF standard interface.
Communication between the IDPF controller computer and the VPSV is
handled within a shared common area in the controller's memory. This
shared memory is organized into an input and output region. The
input region is used to transfer data from VPSV to IDPF. This data
represents the current status of various components of the VPSV.
The VPSV is required to regenerate this region at real-time rates
(50-60 cycles per second). The parameters in this region are as
o Current planimetric position of the two photographic
o Accumulated counts for each valuator since last reading
o Bit pattern for control panel
The output region is generated by IDPF at an undefined rate.
However, the VPSV is required to service requests indicated by the
contents of the output region at real-time rates. The parameters in
the output region represent requested actions by IDPF for the VPSV to
execute. The parameters in this region are as follows:
o Target planimetric position for two photographic stages
o Required image rotation for each stage
o Required magnification for each stage
o Size of measuring mark on each stage
o Illumination of each stage
o Illumination of measuring mark for each stage
o Setting indicators for control panel (such as lights)
o Audible signal tone and duration
The input and output areas of the shared common region represent the
total information required to regulate IDPF's communication with the
VPSV. The capabilities of the VPSV are broader than any
photogrammetric stereoviewer currently in existence. A stereoviewer
is in compliance with IDPF standards if it satisfies the following
two conditions:
1. The stereoviewer can transcribe its status to the read
region of shared memory in the control computer. It is
required to provide information for only the
stereoviewer's hardware facilities which are computer
2. The stereoviewer can respond to requests from IDPF as
indicated by the output region in shared memory of the
control computer. The stereoviewer should respond only to
those requests which can be executed on its hardware under
computer control.