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ISIS Application Documentation

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Enlarge the pixel dimensions of an image

Description
Categories
Groups
Examples
History

Description

This program will enlarge a cube by a given scalar of the original or to specific dimensions. The user can specify to perform the enlargement by cubic convolution, nearest neighbor, or bi-linear interpolation.

Categories

Parameter Groups

Files

Name Description
FROM Input cube to enlarge
TO Output cube

Scaling Parameters

Name Description
INTERPType of interpolation
MODE Scale up the image or enlarge to specific dimensions
SSCALESample magnification factor
LSCALELine magnification factor
ONSNumber of samples in output
ONLNumber of lines in output

Files: FROM

Description

Use this parameter to select the filename. All bands within the file will be enlarged unless a specific band is specified.

Type cube
File Mode input
Filter *.cub

Files: TO

Description

This file will contain the results of the enlargement.

Type cube
File Mode output

Scaling Parameters: INTERP

Description

This is the type of interpolation to be performed on the input.

Type string
Default CUBICCONVOLUTION
Option List:
Option Brief Description
CUBICCONVOLUTIONCubic Convolution interpolation Each output pixel will be set to the value calculated by a cubic convolution interpolation of the calculated input pixel.
NEARESTNEIGHBORNearest Neighbor Each output pixel will be set to the pixel nearest the calculated input pixel.
BILINEARBi-Linear interpolation Each output pixel will be set to the value calculated by a bi-linear interpolation of the calculated input pixel.

Scaling Parameters: MODE

Description

Select between enlarging the image to a multiple of the original (by a scaling factor) or to specific dimensions (in terms of total number of pixels).

Type string
Default SCALE
Option List:
Option Brief Description
SCALE Enlarge by a scaling factor Enlarges the input image by a scaling factor. The scaling factor along the sample range and line range must then be specified in the SSCALE and LSCALE parameters, respectively.

Exclusions

  • ONS
  • ONL

Inclusions

  • SSCALE
  • LSCALE
TOTAL Enlarge to a total number of pixels Enlarges the input image to a total number of pixels. The number of pixels in the output image along the sample range and line range must then be specified in the ONS and ONL parameters, respectively.

Exclusions

  • SSCALE
  • LSCALE

Inclusions

  • ONS
  • ONL

Scaling Parameters: SSCALE

Description

This determines new size of the cube in the sample direction only. The number of samples will be multiplied by this number.

Type double
Default 1.0
Minimum 1.0 (inclusive)

Scaling Parameters: LSCALE

Description

This determines new size of the cube in the line direction only. The number of linees will be multiplied by this number.

Type double
Default 1.0
Minimum 1.0 (inclusive)

Scaling Parameters: ONS

Description

The number of samples desired in the output cube. This value must be greater than or equal to the number of samples in the input image.

Type integer
Minimum 1 (inclusive)

Scaling Parameters: ONL

Description

The number of lines desired in the output cube. This value must be greater than or equal to the number of lines in the input image.

Type integer
Minimum 1 (inclusive)

Examples

Example 1

Enlarge the number of samples by a scaling factor of 2, while leaving the number of lines the same.

Description

Here, the 1024 x 1024 image "peaks.cub" has had the application "reduce" applied to it in order to produce a 512 x 1024 image called "reducedPeaks.cub". In this example, the reduced image, reducedPeaks.cub, will be enlarged by a factor of 2 along the sample dimension in an attempt to restore it back to its original form.

Command Line

enlarge from=reducedPeaks.cub to=restoredPeaks.cub sscale=2.0
In order to double the number of sample pixels, the sample scale is set to 2.0, and the line scale remains at its default of 1.0. Since no mode or interpolation has been specified, the application will default to scale and cube convolution interpolation, respectively.

GUI Screenshot

enlarge gui

Example GUI

Screenshot of the GUI with parameters set to perform an enlargement of the samples by scaling.

Input Images

peaks.cub

Input image for reduce

This is the original image, before being reduced, that the enlarge application will attempt to replicate. It is important to realize that this image has been scaled down to fit in a web browser. At full size, the image would be 1024 x 1024 pixels.

reducedPeaks.cub

Input image for enlarge, output from reduce

Parameter Name: FROM

This is the reduced image, containing half its original number of samples, that enlarge will attempt to restore. Though it has also been scaled down to fit in a web browser, at full size it would be 512 x 1024 pixels. For more information, see the documentation for the "reduce" application.

Output Image

restoredPeaks.cub

Output image from enlarge

Parameter Name: TO

The enlarged image. Despite the fact that half the samples were lost as a result of the reduction, the two images (peaks.cub and restoredPeaks.cub) look nearly identical due to the cubic convolution interpolation that was applied. Again scaled down for web browsers, at full size, the image would be 1024 x 1024 pixels.

Example 2

Enlarge the number of samples to 768, and keep the number of lines at 1024

Description

Here the mode has been set to enlarge to a total number of pixels along the sample and line dimensions, with all other parameters kept at their default settings.

Command Line

enlarge from=reducedPeaks.cub to=enlargeTotalPeaks.cub mode=total ons=768 onl=1024
In order to enlarge to specific dimensions, the mode is set here to "total". Also, because total lines and samples do not have default values, the output number of lines must still be specified, even though they will be unchanged.

GUI Screenshot

enlarge gui

Example GUI

Screenshot of the GUI with parameters set to perform a sample enlargement to a total number of pixels.

Input Image

reducedPeaks.cub

Input image for enlarge

Parameter Name: FROM

This is the same input image, reducedPeaks.cub, that was enlarged in the last example.

Output Image

enlargeTotalPeaks.cub

Output image from enlarge

Parameter Name: TO

The enlarged image. Though it has been scaled down so that it can be viewed in a web browser, the essential change can still be observed. The horizontal enlargement is noticable, and the output cube has 3/2 the number of samples as the input cube.

History

Stuart Sides2002-12-13 Original version
Stuart Sides2003-01-28 Fixed documentation error. The application name was rotate instead of enlarge.
Kim Sides2003-05-13 Added application test
Stuart Sides2003-05-16 Modified schema location from astogeology... to isis.astrogeology..."
Stuart Sides2003-05-30 Fixed compiler error with uninitialized variable after adding -O1 flag
Stuart Sides2003-07-29 Modified filename parameters to be cube parameters where necessary
Drew Davidson2005-08-17 Added example
Brendan George2005-10-31 Fixed application test
Sean Crosby2007-02-28 Program now updates output file's mapping keywords
Steven Lambright2007-06-22 Fixed typo in the user documentation
Steven Lambright2008-05-13 Removed references to CubeInfo
Steven Koechle2008-05-28 Fixed problems with the way the Alpha Cube was handled
Christopher Austin2008-12-11 Changed the parameter names smag/lmag to sscale/lscale for consistancy with reduce.
Steven Lambright2008-12-22 The "Scale" keyword in the Projection group in the labels is now being updated if this program is run on a projected cube.
Janet Barrett2009-10-22 Now uses the SubArea class to produce output cube labels with corrected Mapping, Instrument, and AlphaCube groups.
Travis Addair2009-12-10 Added functionality for enlarging to a total number of pixels.
Travis Addair2009-12-11 Updated example.
Sharmila Prasad2011-04-14 Ported the enlarge functionality to base/objs/Enlarge class
Sharmila Prasad2011-09-15 Fixed issue 0000280 - enlarge fails when run with a batchlist
Kaitlyn Lee2020-04-09 The SetOutputCube method from Process we were originally using called Application::GetUserInterface(), but this became a problem when trying to call enlarge(), or run the application, programmatically since we are no longer using Application in the application's cpp file. Changed the call to the one that takes in a CubeAttribute object. Also, removed the check to see if an invalid interpolation method was passed in since the UserInterface class checks and throws the exception and it was unreachable code.