Merge a HiRISE channel pair to make a single image
Overview
Parameters
Example 1
Description
The program allows the user to combine two HiRISE channels to form a
single CCD image. Histitch will typically be run after radiometric
correction and prior to geometric processing. The two input files
must be the individual channel files (channels 0 and 1) of the
same CCD observation. The program will test to make sure the
Observation IDs and CCD IDs of the input cubes match, and that one
cube is channel 0 and the other is channel 1. The program is clever enough
to figure out the channels associated with each input file and correctly
order them in the output file. Any ancillary data "blobs"
will not be propagated to the output file. The channel number on
the output cube is set to 2 to signify that it is the combination of channels
0 and 1.
histitch can create a CCD image if when only one channel is provided.
The proper placement, left half of CCD for channel 1 images, right half for
channel 0, is determined from the input file and the remainder of the CCD
is filled with Nulls.
Added obsevation id, ccd id, and channel number tests
Kris Becker
2006-02-22
Made FROM2 optional and allow creation of full CCD with just one
channel file.
Brendan George
2006-08-24
Added StitchedChannels keyword to Instrument Group, to identify
which channels were used.
Brendan George
2006-09-01
Added StitchedProductIds keyword to Instrument group, to identify
which images were used.
Brendan George
2006-09-28
Documentation fixes
Stacy Alley
2007-08-16
Added the balance option.
Steven Lambright
2008-05-13
Removed references to CubeInfo
Kris Becker
2008-10-02
Added new EQUALIZE balance option that has utilizes new options WIDTH,
FILL, CHANNEL and OPERATOR parameters. This new option applies a
line-by-line equalization of the CCD channels using and addative or
multiplicative option.
Jeannie Walldren
2008-11-05
Replaced references to DataInterp class with NumericalApproximation.
Kris Becker
2008-12-08
Set channel 1 (left) as the default to hold instead of channel 0.
Added reporting of results to label in the Histitch group. Also added
creation of a Table of data when the EQUALIZE BALANCE option is
selected.
Kris Becker
2008-12-23
The BALANCE=TRUE option now honors the CHANNEL parameter and applies the
coefficient/ratio to the other channel.
Steven Lambright & Stacy Alley
2009-06-09
Added error checking to SKIP and SEAMSIZE parameters. Fixed problem
with accessing out of array bounds.
This is the first of a pair of input HiRISE channel
image files. This file can be either the channel 0
or 1 file. The pair of input files must correspond
to the the same observation of a HiRISE CCD.
This is the second of a pair of input HiRISE channel
image files. This file can be either the channel 0
or 1 file. The pair of input files must correspond
to the the same observation of a HiRISE CCD.
If the user does not provide a file for the second file, histitch
will create a full CCD and map the FROM1 file into the proper
location in the CCD. This allows creation of the full CCD without
both channels being required.
A feature which calculates the average on each channel and multiplies one side with
the ratio of the averages
Type
string
Default
FALSE
Option List:
Option
Brief
Description
TRUE
Balance On
Enables balance feature.
Exclusions
WIDTH
FILL
OPERATOR
FALSE
Balance Off
Disables balance feature.
Exclusions
SEAMSIZE
SKIP
WIDTH
FILL
CHANNEL
OPERATOR
EQUALIZE
Line-by-line equalization
Enables line-by-line equalization feature. This feature uses
the SEAMSIZE and SKIP parameters to generate an average of each
line for both channels. These averages can be filtered (using
an LPF) and missing data filled (using spline interpolation).
The results can be subtracted or multiplied to correct for
downtrack differences in the channels.
When this option is selected, an ISIS Table is created
called HistitchStats. This table contains four fields:
Channel1Original, Channel0Original, Channe1Correction, and
Channel0Correction. If the MULTIPLY OPERATOR is selected,
then one channel corrected column will be all 1.0. For the
ADD OPERATOR one column will contain all 0.0.
The two original columns will contain the results of
averaging the specified window with the values of SEAMSIZE
and SKIP parameters. The correction columns will contain
the ratio (MULTIPLY) or additive (ADD) component of the
correction that was appled to channel 0 or 1, whichever one
is not designated the hold channel in the CHANNEL
parameter.
The ISIS program tabledump can be used to extract the
contents of this table to an ASCII file.
Typically, channel 1, the left channel, is held and channel 0, the
right channel, is corrected. This option allows the user to select
which channel to hold.
