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ISIS Application Documentation


hicubenorm

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Normalize columns in a HiRise cube by performing a lowpass/highpass filter

Overview Parameters

Description

This program was created by adding the HiRise specific code from Eric Eliason's Cubenorm_Filter script to the cubenorm program. Statistics are first acquired from an input cube or from a PVL file or table that was previously generated by the cubenorm program.

A combination lowpass/highpass filter is run on the columnar averages and median values for the input cube. The filter used to do the lowpass filtering is a one dimensional filter whose long dimension is an odd positive value greater than one.

There is an option to create a normalized output cube by applying either a multiplicative or subtractive correction to the data of the input cube. The normalization is performed using the updated statistics that have been filtered. The columnar averages or medians can be chosen as the normalizer. Each pixel is normalized by subtracting the normalization factor or by multiplying by the normalization factor.

There is an option NEW_VERSION which uses the updated logic for correcting Average and Median columns of the cubenorm stats. Similar processing is done individually for the Average and Median columns with combination of high and low pass filters. The left and right edges are problamatic and are cut out at the pause points. There are changes in the number of samples to be NULLed on left/right edge of the image depending on the Channel in the newer version. These samples are Nulled to avoid filter ringing.

For binning mode equal to 1, the number of iterations running lowpass filter is increased to 50 from the original 10. The highpass filter performs by checking for MaxValid pixels and filters by either divide or subtract option depending on the user specified MODE while earlier it was only subtraction. The highpass filter also Marks the samples with missing pixels (less than MaxValid Pixels) due to a problem with furrows or noise. The output of the highpass filter is checked for Markers and set to 1/0(Divide/Subtract) depending on the previous sample value. The direction left/right is based on the Channel.

Categories


Related Objects and Documents

Applications


History

Eric Eliason2004-06-15 Original version (as colnorm)
Drew Davidson2005-07-06 Added options for subtractive corrections
Drew Davidson2005-07-06 Added process by line option and rename to cubenorm
Drew Davidson2005-07-06 Modified unit test to take new options in to account
Jeff Anderson2005-09-09 Major reworking and bug fixes
Drew Davidson2005-10-24 Specialized to run using input files.
Kris Becker2007-01-11 Incorporate UA cubenorm_plus version functionality
Christopher Austin2008-03-17 Changed a single valid pixel's RowCol's Standard Deviation to 0 instead of Isis:Null. When reading in a table file, all Standard Deviations less than 0 are considered 0.
Steven Lambright2008-05-13 Removed references to CubeInfo
Steven Koechle2008-09-02 Fixed check in getstats method that sees whether you are processing by line or column.
Janet Barrett2009-03-10 Changed name to hicubenorm and added Eric Eliason's highpass filter code from the Cubenorm_Filter Perl script used in the pipeline at UofA.
Sharmila Prasad2011-01-27 Modified for the updated Cubenorm_Filter Perl script used in the HiCal pipeline at UofA. Added option NEW_VERSION
Sharmila Prasad2011-02-14 Fixed GUI defaults

Parameter Groups

Files and options

Name Description
FROM Input cube
TO Optional output cube
STATS Optional stats file
NEW_VERSIONNew version of cubenorm filter
FORMATFormat type of STATS file (TABLE or PVL)

Statistics Options

Name Description
STATSOURCEInput source of statistics to apply to FROM cube
FROMSTATSOptional statistics input file source
HIGHPASS_MODE Apply subtraction or division for highpass filter

Filter options

Name Description
FILTERSize of boxcar filter
PAUSECROPExclude column averages at the pause points

Normalization options

Name Description
NORMALIZER Apply normalization using average or median
MODE Apply coefficients through subtraction or division
PRESERVEPreserve the input image median/average
X

Files and options: FROM


Description

Use this parameter to select input HiRise file

Type cube
File Mode input
Filter *.cub
Close Window
X

Files and options: TO


Description

Output file with input columns divided by the column average

Type cube
File Mode output
Pixel Type real
Internal Default No Output file will be created
Close Window
X

Files and options: STATS


Description

Statistical output of each column (band #, column #, valid pixels, average, median, std, min, max)

Type filename
File Mode output
Internal Default No Output file will be created
Close Window
X

Files and options: NEW_VERSION


Description

This option is used to correct average and median Stats from cubenorm application for the hiproc pipeline using latest version 1.9 2009/12/22 18:48:39 of Eric Eliason's hical pipeline

Type boolean
Default FALSE
Close Window
X

Files and options: FORMAT


Description

Specify the format type of the statistics file, either use tabular or PVL style format.

Type string
Default TABLE
Option List:
Option Brief Description
TABLE Create TABLE output Statistics data to be generated in tabluar form, each sample column is placed in a row in the tabluar output.
PVLCreate PVL output Statistics data to be in PVL (Parameter Value Language) format
Close Window
X

Statistics Options: STATSOURCE


Description

This option is intended to be used when the statistics come from a source other than the input cube (default). cubenorm initial derives all its statistics from the input cube and applies it as specified by the user in the same run. This works for most conditions but does not works so well with abrupt changes in brightness such as craters or poles.

With this option, it is now possible to have the statistics come a file in a format compatable with the STATS output file. This can be a TABLE or PVL formatted input file. This allows statistics from other cubenorm runs to be used as input statistics source. It also allows intermediate processing on the FROM stats to apply additional smoothing or culling techniques.

Type string
Default CUBE
Option List:
Option Brief Description
CUBEStatistics are computed from FROM input cube This is the old behavior. The statistics are computed from the input cube as specified by the FROM parameter. They are also applied to the TO file if specifed in the same run.

Exclusions

  • FROMSTATS
PVLStatistics are provided in FROMSTATS in PVL format This option requires a filename in FROMSTATS with PVL formatted data. This format is the same format as is generated in the STATS output file.
TABLEStatistics are provided in FROMSTATS in TABLE format This option requires a filename in FROMSTATS with TABLE formatted data. This format is the same format as is generated in the STATS output file.
Close Window
X

Statistics Options: FROMSTATS


Description

This optional file provides the statistics that are applied to the input FROM file. Its format must be TABLE or PVL and consistant with the STATS file output format.

If this option is utilized, the statistics gathering step is bypassed.

Type filename
File Mode input
Internal Default Optional Input Statistics file
Filter *.txt
Close Window
X

Statistics Options: HIGHPASS_MODE


Description

This option is used to choose subtract/divide for the highpass filter

Type string
Default HIGHPASS_DIVIDE
Option List:
Option Brief Description
HIGHPASS_DIVIDEUse Division for highpass filter This option will use division for highpass filter
HIGHPASS_SUBTRACTUse Subtraction for highpass filter This option will use subtraction for highpass filter
Close Window
X

Filter options: FILTER


Description

This is the total number of samples in the boxcar. It must be a positive odd integer.

Type integer
Default 5
Minimum 3 (inclusive)
Odd This value must be an odd number
Close Window
X

Filter options: PAUSECROP


Description

This option is used to exclude the column averages (11 pixels) at the pause points in the image array. This option only applies to images with a bin mode of 1.

Type boolean
Default TRUE
Close Window
X

Normalization options: NORMALIZER


Description

This option is used to select if column or line is normalized using its average or median

Type string
Default MEDIAN
Option List:
Option Brief Description
MEDIANUse column/line median when normalizing This option will use the median of the column/line when normalizing each column/line
AVERAGEUse column/line average when normalizing This option will use the average of the column/line when normalizing each column/line
Close Window
X

Normalization options: MODE


Description

This option is used to select select how normalization coefficients are applied, either subtracting or dividing by the average or median.

Type string
Default DIVIDE
Option List:
Option Brief Description
DIVIDEDivide column/row by its median/average This option will divide each column (or row) by its normalizer (median or average).
SUBTRACTSubtract median/average from column/row This option will subtract the normalizer (median or average) from each column (or row).
Close Window
X

Normalization options: PRESERVE


Description

This option is used to preserve the average/median of the input image. If turned off, the output image average of the data will be one (unity) for the DIVIDE mode or zero for the SUBTRACT mode.

Type boolean
Default TRUE
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