This page summarizes the Crop tool.
Motivation
Often a part of a scenery is more suitable for e.g. modelling work compared to work on e.g. a complete scenery recorded. Hyperspectral data cubes typically come along with a large memory consumption and typically large data processing effort.
Furthermore, modelling methods can often generate more targeted results e.g. when focusing on the "important" part of spectra.
Function
The Crop Tool allows to crop hyperspectral data cubes along
- the spatial,
- the spectral and
- the sample domain (the time domain in case of line-scan).
The result of the crop process is a new cube available in the project browser.
About the Crop Tool
The tool is accessible out from the ribbon in several perspectives of the Perception Studio program.
In following the Crop Tool of a hyperspectral data cube of various plastic plates is shown.
On the left side of the tool the Preview feature image gives access to the spectral information of various plastic plates.
The right image visualizes the spectral information at the time position selected by the time point locator (the red line) in the left view. The greenish outer rectangle in the views facilitates the crop process to a 3D region of interest.
On the bottom of the views the coordinates of the selected region is shown. E.g. compose a region by editing this controls.
Crop the Pixel Domain
In the left image drag the sides of the greenish rectangles to set the region of interest in the pixel domain.
Alternatively, use the controls Sample Axis and Spatial Axis to set a desired region of interest manually.
Crop the Sensor Domain (pushbroom)
In the right image drag the sides of the greenish rectangles to set the region of interest in the sensor domain.
Changes to the width cause a spectral crop, while changes to the height crop the spatial domain (number of pixel on the inspection line).
Alternatively, use the controls Spectral Axis and Spatial Axis to set a desired region of interest manually.
Cancel
Click on cancel to abort without cropping the data.
Crop
Click on the Crop button in the bottom right to confirm your current settings.
Workflow
- Select a cube of interest in the current perspective (like Explore or Model)
- Click on Crop icon within the ribbon of the perspectives.
- The Crop Tool gets opened.
- Set the desired region of interest.
- Click Crop button to perform the crop process.
- E.g. in the project browser select the new (cropped) data cube.
Hints
Before starting the Crop process ensure the selected hyperspectral cube is shown most properly. The CCI Preview method is used for visualization of the hyperspectral cube. E.g. try different preprocessing options to get the visualization to a form most fit for the selection process. E.g. see the documentation on Strategies on the Configuration of Hyperspectral Preprocessing.
© 2019 by Perception Park GmbH
The content of this page and any attached files are confidential and intended solely for the addressee(s). Any publication, transmission or other use of the information by a person or entity other than the intended addressee is prohibited. If you receive this in error please contact Perception Park and delete copied material. Perception Park GmbH, Wartingergasse 42, A-8010 Graz; Austria; FN 400381x