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Software Tools for Image Processing

Software Tools for Image Processing Larry Biehl, Systems Manager, PTO (biehl@purdue.edu) March 12, 2007. Software for Image Processing. Leica Geosystems Imagine http://www.gis.leica-geosystems.com/ ITT (formerly RSI) ENVI http://www.ittvis.com/envi/ Free version: FreeLook

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Software Tools for Image Processing

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  1. Software Tools for Image Processing Larry Biehl, Systems Manager, PTO(biehl@purdue.edu)March 12, 2007

  2. Software for Image Processing • Leica Geosystems Imagine • http://www.gis.leica-geosystems.com/ • ITT (formerly RSI) ENVI • http://www.ittvis.com/envi/ • Free version: FreeLook • ESRI ArcGIS with RS Extensions • http://www.esri.com/ • Free version: ArcExplorer • PCI Geomatics Geomatica • http://www.pcigeomatics.com/ • Free version: FreeView

  3. Software (Continued) • Definiens Professional (sold by PCI in U.S.) • http://www.definiens.com/ • ER Mapper • http://www.ermapper.com/ • IDRISI (sold by Clark Labs, Clark University) • http://www.clarklabs.org/ • TNTmips • http://www.microimages.com/ • Free version: TNTlite

  4. Software (Continued) • Copenhagen Image Processing System • http://www.geogr.ku.dk/chips/ • Free • Spring (INPE, Brazil) • http://www.dpi.inpe.br/spring/ • Free • MultiSpec (Purdue University) • http://dynamo.ecn.purdue.edu/~biehl/MultiSpec/ • Free • Do others have another favorite??

  5. To image with a dozen or fewer different information categories Primary Purpose of Remote Sensing Analysis Convert multispectral image with thousands or more different measurements Management decisions are then made based on the information categories.

  6. MultiSpec: Freeware Tool for Image Data Analysis • Purpose: • Technology Transfer (Provide ability for other researchers to try new techniques without having to program the algorithms) • Teaching (Use in remote sensing courses; significant use now in K-12) • Research (Grad students use in research) • Platforms: Macintosh and Windows • Developed at Purdue University http://dynamo.ecn.purdue.edu/~biehl/MultiSpec/

  7. Sample MultiSpec Window (Windows Version) Application Menu Coordinate View Project Window Image Window Graph Window Text Output Window Histogram Plot

  8. MultiSpec Image Windows • Multispectral • Display bands or channels • Data values control color • Thematic • Display classification results or other themes • Data values point to color in table

  9. Multispectral Image Window (Windows version) Tool Bar Overlay control Zoom out control Zoom in control Magnification control Selected area Zoom factor indicator

  10. Class/Group Popup Legend Scroll Legend Down Palette Popup Scroll Legend Up Example of Thematic Image

  11. Some Analysis Features • Recognizes: ArcView, ENVI, ERDAS *.LAN, Imagine, FastL7A, GAIA, TIFF/GeoTIFF, HDF, LAS, LARSYS MIST, LGSOWG, MacSADIE, NetCDF, PDS, Sun “Screen Dump”, TARGA, VICAR file formats. • Import Data: BIL, BSQ, BIP band interleave formats; 8-, 16- & 32-bit signed/unsigned integer, 32- & 64-bit real data types; overlay shape files • Histogram & Display Images • Cluster: Single Pass or ISODATA algorithms • Define Classes: Rectangular, Polygonal, Clusters, Mask • Feature Definition: Subsets, or Optimal Subspaces • Statistics Enhancement: Via Labeled & Unlabled; LOOC • Classification: Spectral or Spectral-Spatial [ECHO] • Results Display: Thematic and Tabular • Utility Functions: Graph Spectra, Scatter Diagrams, Principal Components, Ratios, Add/Multiply Bands, Mosaicing, Changing Geometry, Visualization aids

  12. Channel number and/or description Example of Side by Side Multispectral Image

  13. Tutorials Available on Web Site • Display and Inspection of Image Data 
 • Image Enhancement
 • Unsupervised Classification (Cluster Analysis) 
 • Supervised Classification 
 • Combining Separate Image Files into a Single Multispectral Image File
 • Overlay Shape Files on Image Window
 • Selecting Areas and the Coordinate View

  14. Examples of Issues to Check for When Analyzing Remote Sensing Data Data not saturated Data is saturated

  15. No Compression SID 100 Resampled (smoothed) Original Data SID 20 Issue Examples (continued) Users will need to decide the tradeoff.

  16. Very much improved. Issue Examples (continued) Notice “stitching problem” when combining multiple images.

  17. Examples (continued) Notice the color tone change in the image. This occurred when combining two images. 4 Meter MultiSpectral Satellite Imagery Example provided by Nathan Watermeier

  18. Acknowledgements • Funding for the research leading to the development of MultiSpec was provided by NASA • The Globe Program provided the support for the initial Windows versions of MultiSpec

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