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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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Presentation Transcript
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
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
slide14
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.
slide16
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
slide17
GUI
  • Plan to design file select dialog
ad