noseam Documentation

noseam - Level 4 / Boxfilter (LPF,HPF) mosaic seam removal
This procedure smooths out seam boundaries between frames within a
mosaic.  An input list of images (FROMLIST) is read in sequential order
and the images are mosaicked together to create a base mosaic. The
base mosaic filename will be "base.cub".  If the base.cub is not
deleted it is suggested that you rename this file later. The user has
a choice to create the base.cub file or not.  If a base mosaic
already exists, the filename needs to be entered in the BASE
parameter and CRBASE = no.  Make sure that the LAT/LON is set to
the same values as the existing base mosaic. The individual images
are then run through a high pass filter and mosaicked together to
create a HPF mosaic.  The base mosaic is run through a low pass
filter to create the LPFV mosaic.  The HPF mosaic is then added to
the LPFV mosaic and the result should be a seamless (or improved)
mosaic.  If the output mosaic is not seamless, try adjusting the
boxfilter parameters, LINE and SAMP.  For more detail on the filters
that are executed, refer to the help in the program BOXFILTER. To
determine filter size depends on the size of overlap of the input
images.
**NOTE: 65 x 65 has generally worked well with Viking data.  However,
for some mosaics of Viking data the size has been changed to as low as
19 x 19 and as high as 201 x 201.  See soderblom et al, 1978
icarus 34 pp. 446-464.  For Europa Voyager I and II hi-resolution
images, 201x201 worked best.

List of filenames

NONE

Output mosaic

NONE

Create unfiltered base
  mosaic (YES/NO)

YES

Output unfiltered base
        mosaic

"base.cub"

Temporary hpf output

"h.cub"

High pass filter mosaic

"highmos.cub"

Low pass filter mosaic

"lowmos.cub"

Boxfilter size in
  Line direction
(Odd value)

NONE

Boxfilter size in
  Sample direction
(Odd value)

NONE

Latitude range of
  output mosaic

NONE

Longitude range of
  output mosaic

NONE

Disable processing history text

YES

Place each image on
  top of output mosaic
 (YES/NO)

YES

Check the BAND_BIN_CENTER
keyword in the input cube
and output mosaic to find
a match in the band dimension.
  (YES/NO)

YES

Backplane test
(RES,EMALO,EMAHI,INCLO,INCHI,
 MORPH,ALBEDO)

--

Delete base "seam" mosaic
 (YES/NO)

NO

ADDITIONAL NOTES:

Parm	Description
FROMLIST	This is an ascii file that contains the input filenames of images that go into the output mosaic. The filenames in this input list should be in the order that the images are to be layed down on the mosaic. Keep in mind the TOP parameter. For example, if TOP = Y, then the first image in the FROMLIST will be placed on the bottom of the mosaic, and each sequential input image will be placed on top. The order should be considered even if the Backplanes are to be considered.
TO	Output mosaic filename with seams minimized or removed.
CRBASE	The user has a choice to create the base.cub file or not. If a base mosaic already exists, the filename needs to be entered in the BASE parameter and CRBASE = no. Make sure that the LAT/LON is set to the same values as the existing base mosaic.
BASE	The base mosaic created from input files. This has not had any filters applied at all. This parameter allows the user to choose the destination of the file created.
H	This is the temporary output file created as an individual image is run thru a high pass filter. This file is deleted after it has been mosaicked to the output HMOS file. This parameter allows the user to choose the destination of the file created.
HMOS	The output mosaic created from hpf filtered files. This file is deleted at the end of the procedure. This parameter allows the user to choose the destination of the file created.
LOW	The mosaic created by filtering the base mosaic with an lpfv filter. This file is deleted at the end of the procedure. This parameter allows the user to choose the destination of the file created.
LINE	Boxfilter size in the line direction for the high pass filter and the low pass filter. It must be an odd value. For the noseam procedure.
SAMP	Boxfilter size in the sample direction for the high pass filter and the low pass filter. It must be an odd value. For the noseam procedure.
LAT	This is the latitude range of the output mosaic.
LON	This is the longitude range of the output mosaic.
HIST	Disable the processing history text. This will improve the efficiency if a large mosaic is being created. It will also keep the processing history text from becoming "FULL", which results in MOSAIC bombing and creating "DIRTY" labels of the input image.
TOP	If TOP = Y, each individiual image added to the output mosaic will be placed on top. Otherwise, if TOP = N, each image will be placed underneath the output mosaic file. For more detailed information, refer to the help in the program MOSAIC.
BANDCHK	If this is set, MOSAIC will check the BAND_BIN_CENTER keyword of the input cube and output mosaic cube to find the correct band to mosaic into. If this is turned off, MOSAIC assumes a one to one corresondence in the band dimension between the input cube and the mosaic cube. In other words, band 1 of the input cube will be mosaicked into band 1 of the mosaic cube and so on up to the nth band.
BACKCHK	This parameter will check values of resolution, emission angle and incidence angle in the backplanes of the input image cube to decide which pixel to keep (input cube v.s. output mosaic cube). The null default value will do no backplane testing. See help in the program MOSAIC.
DELBASE	If DELBASE is yes, NOSEAM will delete the base mosaic.