MVNAES -- AES Terascan Tape to Video Transfer
MVNAES: MAG TAPE TO VIDEO 10-BIT AES TERASCAN FORMAT - transfers
10-bit image data from AES NOAA/AVHRR magnetic tape to display.
PARAMETERS
MVNAES is controlled by the following global parameters:
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
MTIC
Specify list of image channels on input magnetic tape:
EASI>MTIC=i,j,...,p | integers, 1-5
- Up to 5 channels can be handled.
- Ranges of channels can be specified with negative values. For
example: {1,-3,5} is internally expanded to {1,2,3,5}.
VDOC
Specify list of output image channels to receive imagery on the
video display:
EASI>VDOC=i,j,...,p | integers, 1-?
- The number of channels specified in MTIC and VDOC MUST be equal
and are limited by the number of image planes on the display.
- Up to 5 video output channels can be handled.
- Ranges of channels can be specified with negative values. For
example: {1,-3,5} is internally expanded to {1,2,3,5}.
MTIW
Specify a rectangular subset of an image on magnetic tape:
EASI>MTIW=Xoffset,Yoffset,Xsize,Ysize
- The offset + size must not exceed the image size.
- The origin (0,0) is at the upper left.
VDOW
Specify a rectangular subset of the image plane to receive imagery
on the video display:
EASI>VDOW=Xoffset,Yoffset,Xsize,Ysize
- The offset + size must not exceed the display size.
- The origin (0,0) is at the upper left.
- The default is the entire image.
- If the X and Y sizes of VDOW and MTIW are not equal, shrinking or
zooming will be performed automatically.
ROTA
Specify whether input image should be rotated 180 degrees.
EASI>ROTA="OFF" | no rotation of image (default)
EASI>ROTA="ON" | image will be rotated 180 degrees
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 (1, 3, 5 or
n*2-1, where 'n' image file number on tape). 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=3 | read second file on tape
EASI>STARTFIL=n*2-1 | read nth file on tape
DETAILS
MVNAES reads 10-bit image data , stored as 16-bits unsign data, from
AES TeraScan (HRPT) format tapes. The 10-bit data are compressed to
8-bit data on the video display.
Pixels on tape are stored as 10-bit integers. The number of pixels
per line is 2048. The number of lines per band is variable. The
number of image bands is 5.
Image data are transferred from any set of image channels on 10-bit
AES TeraScan (HRPT) 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 window on the display (VDOW). Shrinking and/or
zooming is performed if the input window size does not equal the
output window size. If the display output window is not specified,
it defaults to the entire display.
MVNAES compresses AES TeraScan (HRPT) 10-bit pixels to 8-bit pixels,
by dividing values (from 0 to 1023) by 4.
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.
A TAPE MUST BE MOUNTED ON THE TAPE DRIVE BEFORE MVNAES CAN BE RUN.
CLEANING THE TAPE HEADS IS RECOMMENDED TO MINIMIZE THE CHANCE OF
TAPE READ ERRORS.
EXAMPLE
Transfer upper left 512 by 512 window of first three bands on 10-bit
NOAA image from tape to video display. 10-bit data are compressed to
8-bit data by dividing the values (from 0 to 1023) by 4.
EASI>MTIC=1,2,3
EASI>VDOC=1,2,3
EASI>MTIW=0,0,512,512
EASI>VDOW=MTIW
EASI>ROTA="OFF"
EASI>STARTFIL=1
EASI>RUN MVNAES
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