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 1. 2 Micron All Sky survey. 2. High resolution infrared Image. 3. Potential to detect members nearby(d<2kpc) cluster. 4. 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.

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...

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

Example NGC2362

Challenge Easy? Coordination known. No! 1. Coordination has limited accuracy 2. Multi-resolution 3. Background differs significantly 4. Bad Pixel effect

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

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

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

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

A B C A B C Data relation

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, ,>10000) –Geometric correction(option) –Redefine the data structure –Write into a new fits file

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.

GUI

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

GUI Plan to design file select dialog

Thanks!