Astronomy image mosaic
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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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Astronomy image mosaic

Astronomy image mosaic

R.I.T

Bo Mu


Project goals

Project Goals

  • Mosaic 2MASS images and Chandra X-ray images

  • Visualize the overlay result

  • Reposition and register display images relative to reference points


Background

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.


Background1

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/


Trade off

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

Example

  • NGC2362


Challenge

Challenge

  • Easy?

    Coordination known.

  • No!

  • Coordination has limited accuracy

  • Multi-resolution

  • Background differs significantly

  • Bad Pixel effect


Solution

Solution

  • Refine coordination system by reference point

  • Multi-resolution Algorithm (wavelet?)

  • Back ground equalization

  • Subtract the dark image.


Expectation

Expectation

  • Visualization

  • Contrast adjust interactively

  • Zoom

  • Some filters to help investigate image.


Current status

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 status1

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


Data relation

Data relation

B

B

A

A

C

C


Current status2

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


Astronomy image mosaic

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.


Astronomy image mosaic

GUI


Astronomy image mosaic

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


Astronomy image mosaic

GUI

  • Plan to design file select dialog


Astronomy image mosaic

Thanks!


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