ISIS Application Documentation
Compute the center of mass of a single-band cube
Overview
Parameters
Example 1
Description
This program computes the sample and line of the center of mass (weighted
by pixel value) of a single-band cube. The sample and line of the centroid,
as well as the offset from the image center, are output in PVL. In addition
if the TO parameter is specified this program will ouput a single-band cube
of the same size with the center of mass of the input cube at the center of
the image frame.
The primary purpose of this program is to align multiple images of an object for
a movie, such as images taken on approach. This program is best used with
objects against a dark background.
Categories
Applications
History
Kris Becker 2014-12-25
Original version
Jeffrey Covington 2015-02-19
Added more documentation and restricted center to single-band cubes.
Parameter Groups
Files
Name
Description
FROM
Input cube/image to center
TO
Output cube
INTERP
Interpolation used for Transformation
MINIMUM
Minimum DN value to consider
MAXIMUM
Maximum DN to consider in computation
Files :
FROM
Description
Use this parameter to select the filename. Only one band is allowed
in the input cube.
Type
cube
File Mode
input
Filter
*.cub
Files :
TO
Description
If specified this file will contain the results of the centered cube.
Type
cube
File Mode
output
Internal Default
None
Inclusions
Filter
*.cub
Files :
INTERP
Description
This will be the interpolation type used to get the output file
in either the translate or warp application. Defaults to
CUBICCONVOLUTION.
Type
string
Default
CUBICCONVOLUTION
Option List:
Option
Brief
Description
NEARESTNEIGHBOR
Nearest Neighbor Interpolation
Nearest Neighbor Interpolation will be used in the transformation
to create the output file.
BILINEAR
Bilinear Interpolation
Bilinear Interpolation will be used in the transformation to create
the output file.
CUBICCONVOLUTION
Cubic Convolution Interpolation
Cubic Convolution Interpolation will be used in the tranformation
to create the output file.
Files :
MINIMUM
Description
Minimum DN in the image to consider for computation of the center of
mass. This can be helpful to eliminate background data.
Type
double
Internal Default
ValidMin
Less Than
MAXIMUM
Files :
MAXIMUM
Description
Maximum DN to consider in computation of center of mass. This can be
used to eliminate high saturation that would otherwise bias the
centroid calculation.
Type
double
Internal Default
ValidMax
Example 1
Centering object against dark background.
Description
This example shows centering a body against a dark background.
Command Line
center center from=EN0131836960M_iof.cub to=centered.cub
Center the input image about the center of mass using the default interpolation.
GUI Screenshot
Mirror Gui
Example Gui
Screenshot of GUI with parameters filled in to perform
a center operation on the input image.
Input Image
Input image
Input image for center
Parameter Name:
FROM
This is the 512 by 512 input image for the center example.
Output Image
Output image showing results of the center application.
Output image for mirror
Parameter Name:
TO
This is the 512 by 512 output image that results.
