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ISIS Documentation

segment

Divides a cube object into multiple output cubes in the line direction.

This program takes an input cube and divides it into multiple output cubes in the line direction. The total number of lines in these output cubes, as well as the number of lines these output cubes overlap, are be determined by user given parameters. If the overlap parameter is greater than the total line number parameter, then a User Errror will be thrown. If the final segment does not end on the same line that the input cube ends, then the final segment will be smaller than the other segments. In other words, the final segment will simply be created to the end of the original cube, not being filled with null lines.

Note: The output cubes (which will here on be referred to as segments) will be created in the naming form of (InputCubeName).segment(#).cub
i.e. peaks.segment1.cub, peaks.segment2.cub, peaks.segment3.cub, peaks.segment4.cub, etc

Categories

History

Christopher Austin2007-10-30 Original version

Parameters

Files

Input cube to be segmented.
Type cube
File Mode input
Filter *.cub

Output Parameters

Specifies the total number of lines each segment will contain. This parameter must always be specified.
Type integer

Specifies the total number of lines of overlap each segment will have with the previous segment as well as the next segment. This parameter must always be specified.
Type integer

Example 1

Segmented Peaks

This example shows how segment works on peaks.cub, a cube of Flagstaff's peaks. It also demonstrates the automatic resizing of the final segment.

Command Line

Creates segments from peaks.cub which have a total of 531 lines each, and overlap by 88 lines.
segment FROM=peaks.cub NL=531 OVERLAP=88

Input Image

peaks.cub

The original image

peaks.cub

Parameter Name: FROM

This is the input image peaks.cub

Output Images

peaks.segment1.cub

The first segment.

peaks.segment1.cub

This is the first segment created from peaks.cub

It has the same sample width and band depth as peaks.cub, and has a total number of lines equal to the NL parameter, which is 531 in this example.

peaks.segment2.cub

The second segment.

peaks.segment2.cub

This is the second segment created from peaks.cub

Like peaks.segment1.cub, it has 531 lines and the same sample width and band depth as peaks.cub. The first 88 lines of this cube (peaks.segment2.cub) are identical to the last 88 lines of its previous cube (peaks.segment1.cub). In the same manner, the last 88 lines of peaks.segment2.cub are identical to the first 88 lines of peaks.segment3.cub

peaks.segment3.cub

The third segment.

peaks.segment3.cub

This is the third segment created from peaks.cub

Notice how this segment is smaller than the other 2 segements. This is due to the fact that it reached the end of peaks.cub, nevertheless, it still has the same sample width and band depth as peaks.cub
This shortening of the segment will only happen in the final segment created from the input cube.