MVW -- WIPS Tape to Video Transfer


<HEAD><TITLE>MVW -- WIPS Tape to Video Transfer</TITLE></HEAD>


<H1>MVW -- WIPS Tape to Video Transfer</H1>
Transfers image data from an AVHRR-WIPS magnetic tape to the video
display.
<P>
<H3>PARAMETERS</H3>
MVW is controlled by the following global parameters:
<P>
<pre>Name     Prompt                                  Count     Type
MTIC     Mag Tape Input Channel List             1-5       Int
VDOC     Video Output Channel List               1-5       Int
MTIW     Mag Tape Input Window                   4         Int
VDOW     Video Output Window                     0-4       Int
ROTA     Rotate Image: ON/OFF                    2-3       Char
STARTFIL Start File on Tape                      1         Int
</pre>
<H4>MTIC</H4>
MTIC represents a list of image channels that exist on the input
magnetic tape:
<P>
<PRE>
 EASI&gt;MTIC=i,j,...,p            | integers, 1-5
</PRE>
<UL>
<LI> Up to 5 channels can be handled. 
<LI> Ranges of channels can be specified with negative values. For
example: {1,-3,5} is internally expanded to {1,2,3,5}. 
</UL>
<H4>VDOC</H4>
VDOC represents a list of output image channels to receive imagery
for the video display:
<P>
<PRE>
 EASI&gt;VDOC=i,j,...,p            | integers, 1-?
</PRE>
<UL>
<LI> Up to 5 channels can be handled. 
<LI> Ranges of channels can be specified with negative values. For
example: {1,-3,5} is internally expanded to {1,2,3,5}. 
</UL>
<H4>MTIW</H4>
MTIW specifies a rectangular subset of an image on magnetic tape to
be used for input to the MVW task:
<P>
<PRE>
 EASI&gt;MTIW=Xoffset,Yoffset,Xsize,Ysize
 EASI&gt;MTIW=                     | defaults to entire image
</PRE>
The offset + size must not exceed the image size.
<P>
<H4>VDOW</H4>
VDOW specifies a rectangular subset of the image channel data to be
received on the video display:
<P>
<PRE>
 EASI&gt;VDOW=Xoffset,Yoffset,Xsize,Ysize
 EASI&gt;VDOW=                     | defaults to entire image
</PRE>
The offset + size must not exceed the image size.
<P>
<H4>ROTA</H4>
If ROTA=&quot;ON&quot;, image is rotated 180 degrees.
<P>
<PRE>
 EASI&gt;ROTA=&quot;OFF&quot;
</PRE>
<H4>STARTFIL</H4>
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.
<P>
<PRE>
 EASI&gt;STARTFIL=1              | read first file on tape
 EASI&gt;STARTFIL=n              | read nth file on tape
</PRE>
<H3>DETAILS</H3>
MVW transfers image data from any set of bands from an AVHRR-WIPS
tape (MTIC) to any set of image planes on a video display (VDOC).<p>
Any arbitrary rectangular window on tape (MTIW) can be transferred
to any arbitrary rectangular window on the display (VDOW). Shrinking
and/or zooming is automatically performed.<p>
The image can be rotated (ROTA) a full 180 degrees before being
shown on the display, if desired. This turns the image upside- down.
By default, rotation is OFF.<p>
Any file (image) on tape (STARTFIL) can be specified. MVW will
rewind, then advance to the selected file before transferring.<p>
More information on WIPS mag tape format can be found in the
documentation for program MIW.
<P>
<PRE>
 A TAPE MUST BE MOUNTED ON THE TAPE DRIVE BEFORE MVW CAN BE RUN.
 CLEANING THE TAPE HEADS IS RECOMMENDED TO MINIMIZE THE CHANCE OF
 TAPE READ ERRORS.
</PRE>
<H3>EXAMPLE</H3>
Read upper-left 512 by 512 corner of first three bands on tape and
transfer to first three image planes on video display.
<P>
<PRE>
 EASI&gt;MTIC=1,2,3
 EASI&gt;VDOC=1,2,3
 EASI&gt;MTIW=0,0,512,512
 EASI&gt;VDOW=MTIW
 EASI&gt;ROTA=&quot;OFF&quot;
 EASI&gt;STARTFIL=1
 EASI&gt;RUN MVW
</PRE>
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