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Astronomy image mosaic

Astronomy image mosaic. R.I.T Bo Mu. Project Goals. Mosaic 2MASS images and Chandra X-ray images Visualize the overlay result Reposition and register display images relative to reference points. Background. 2MASS 2 Micron All Sky survey. High resolution infrared Image.

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Astronomy image mosaic

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  1. Astronomy image mosaic R.I.T Bo Mu

  2. Project Goals • Mosaic 2MASS images and Chandra X-ray images • Visualize the overlay result • Reposition and register display images relative to reference points

  3. Background • 2MASS • 2 Micron All Sky survey. • High resolution infrared Image. • Potential to detect members nearby(d<2kpc) cluster. • color is helpful to distinguish stars FOR MORE INFO... pegasus.phast.umass.edu/ A parsec is the distance at which a star has a parallax of 1 arcsec.

  4. Background • Chandra X-ray image 1. Represent powerful - Young,low-mass star are highly luminous and variable X-ray source 2. Overcome the ambiguities in crowed regions near the galactic plane. FOR MORE INFO... http://www.chandra.harvard.edu/

  5. Trade Off • 2mass,CXO High resolution(~0.1”), Low sensitivity • Optical Image Low resolution(5’’), High sensitivity • Need to Combine with 2mass, CXO and XMM/Newton(optical) image

  6. Example • NGC2362

  7. Challenge • Easy? Coordination known. • No! • Coordination has limited accuracy • Multi-resolution • Background differs significantly • Bad Pixel effect

  8. Solution • Refine coordination system by reference point • Multi-resolution Algorithm (wavelet?) • Back ground equalization • Subtract the dark image.

  9. Expectation • Visualization • Contrast adjust interactively • Zoom • Some filters to help investigate image.

  10. Current Status • Astronomy image file format • fits file • keyword (naxis,crpix,crval,crot,cdelta) in header Process: Structure array to save multi image data.

  11. Current Status • Algorithm • Read into multi astro images with fits format • Calculate max,min border • Adjust the order of images according to the coordinates(RA,DEC) • Data Structure

  12. Data relation B B A A C C

  13. Current Status • Algorithm • Multi-resolution. Use shift function to solve it. More complex, try wavelet Algorithm. • Try Crosscorrealtion • Calculate the gray level(Average back ground or histogram. Value –1,0, 650-800,>10000) • Geometric correction(option) • Redefine the data structure • Write into a new fits file

  14. GUI • Read multifiles into a structure by >>Dialog_Pickfile(,/multiple) >>Readfits • Initialize interface Dynamic distribute display window according to the number of images • Display images with mouse position and astronomy coordinates.

  15. GUI

  16. GUI • GUI: menu, label, text,slider display window,dialog • Slider to adjust image contrast • Solve the trouble on displaying multiimages and capture mouse focus among subwindows. • Working on zooming image

  17. GUI • Plan to design file select dialog

  18. Thanks!

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