MVH -- PCI Tape to Video Transfer

Transfers image data from a PCI magnetic tape to the video display.

PARAMETERS

MVH is controlled by the following global parameters:

Name     Prompt                                  Count     Type
MTIC     Mag Tape Input Channel List             1-16      Int
VDOC     Video Output Channel List               1-16      Int
MTIW     Mag Tape Input Window                   0-4       Int
VDOW     Video Output Window                     0-4       Int
STARTFIL Start File on Tape                      1         Int

MTIC

MTIC represents a list of image channels that exist on the input magnetic tape:

 EASI>MTIC=i,j,...,p            | integers, 1-16

Ranges of channels can be specified with negative values. For example: {1,-4,10} is internally expanded to {1,2,3,4,10}.
Up to 16 channels can be specified.
Duplicate channels are NOT allowed.

VDOC

VDOC represents a list of output image channels to receive imagery for the video display:

 EASI>VDOC=i,j,...,p            | integers, 1-16

Ranges of channels can be specified with negative values. For example: {1,-4,10} is internally expanded to {1,2,3,4,10}.
Up to 16 channels can be specified.
Duplicate channels are NOT allowed.

MTIW

MTIW specifies a rectangular subset of an image on magnetic tape to be used for input to the MVH task:

 EASI>MTIW=Xoffset,Yoffset,Xsize,Ysize
 EASI>MTIW=                     | defaults to entire image

The offset + size must not exceed the image size.

VDOW

VDOW specifies a rectangular subset of the image channel data to be received on the video display:

 EASI>VDOW=Xoffset,Yoffset,Xsize,Ysize
 EASI>VDOW=                     | defaults to entire image

The offset + size must not exceed the image size.

STARTFIL

Specifies the start file number on tape from which to start reading header and image data. If STARTFIL is greater than one, the program rewinds the tape and advances to the specified file. STARTFIL must be set to the file number required by MSH program to print tape header report.

 EASI>STARTFIL=1              | read first file on tape
 EASI>STARTFIL=n              | read nth file on tape

DETAILS

MVH transfers image data from any set of bands on PCI tape (MTIC) to any set of image planes on a video display (VDOC).

Any arbitrary rectangular window on tape (MTIW) can be transferred to any arbitrary rectangular window on the display (VDOW).

The number of input pixels MTIW(3) and output pixels VDOW(3) each have a limit of 32256 bytes.

Shrinking and/or zooming is automatically performed. By default, the whole tape image is transferred, filling the entire display.

A file start number may be specified so that a particular image on magnetic tape can be displayed. If STARTFIL is greater than one, MVH will first rewind and then advance to the desired file.

More information on the PCI mag tape format can be found in the documentation for program IMH.

 A TAPE MUST BE MOUNTED ON THE TAPE DRIVE BEFORE MVH CAN BE RUN.
 CLEANING THE TAPE HEADS IS RECOMMENDED TO MINIMIZE THE CHANCE OF
 TAPE READ ERRORS.

EXAMPLE

 EASI>MTIC=1,2,3
 EASI>VDOC=1,2,3
 EASI>MTIW=0,0,512,512
 EASI>VDOW=MTIW
 EASI>STARTFIL=2
 EASI>RUN MVH

About PCI Help Gateway