ImageComparerImageComparer

A VO tool for variability searchesA VO tool for variability searches

The Team:

Colin Aspin, Oliver Fraser, Nathaniel Paust, Rafael Santos

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Scientific Aim: Using VO tools, perform automated image comparison to search for source variability.

Example: DSS1 and DSS2. Look for stars in regions of active star formation, that have changed significantly in brightness between the two epochs.

Many other applications for ImageComparer.

Scientific Aim: Using VO tools, perform automated image comparison to search for source variability.

Example: DSS1 and DSS2. Look for stars in regions of active star formation, that have changed significantly in brightness between the two epochs.

Many other applications for ImageComparer.

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ImageComparerImageComparerDesign: use VO-enabled java/python to

produce both a web-based interface and command line client to the tool.

Oliver worked on the python code to ‘grab’ images and catalogs from the web.

Nathaniel worked on the source identification, photometry, and cross-matching.

Rafael worked on the web UI and output page.

Colin drunk coffee :)

Design: use VO-enabled java/python to produce both a web-based interface and command line client to the tool.

Oliver worked on the python code to ‘grab’ images and catalogs from the web.

Nathaniel worked on the source identification, photometry, and cross-matching.

Rafael worked on the web UI and output page.

Colin drunk coffee :)

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Java code for Web UI:Java code for Web UI:

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Python code for VO web access:Python code for VO web access:

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Python code for VO web access:Python code for VO web access:

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Python/pyraf code for image analysis:

Python/pyraf code for image analysis:

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Future Improvements:Photometrically calibrate using web

catalogs e.g. Tycho-2, UCAC, USNO-B, etc.

Create VO accessible output - SQL DB?Integrate with VOEvent?Remove legacy software

dependencies.Package command line software for

client operation.

Future Improvements:Photometrically calibrate using web

catalogs e.g. Tycho-2, UCAC, USNO-B, etc.

Create VO accessible output - SQL DB?Integrate with VOEvent?Remove legacy software

dependencies.Package command line software for

client operation.