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Image Processing for Weak Lensing. Wentao Luo SHAO May 14, 2014 NAOC. Contents. Weak Gravitational Lensing Accurate image processing—PSF correction Reconstruct the density field using weak lensing. Time delay:. Deflection angle:. Hilbert et al 2009. Narayan & Bartelmann 1997. Jacobian.

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image processing for weak lensing

Image Processing for Weak Lensing

Wentao Luo

SHAO

May 14, 2014 NAOC

contents
Contents
  • Weak Gravitational Lensing
  • Accurate image processing—PSF correction
  • Reconstruct the density field using weak lensing.
slide5

Time delay:

Deflection angle:

Hilbert et al 2009

methods
Methods
  • Traditional methods

2, Re-Gaussianization (Hirata & Seljak 2003)

3, Rounding Kernel (Bernstein & jarvis 2002)

4, Shapelets (Refregier 2000)

  • Jun Zhang 2008; Jun Zhang 2010; Jun Zhang, WTL & Sebastien. Foucaud 2014
the structure of our pipeline
The Structure of Our Pipeline

re-Gaussianized image

R

Input image

HS03

Out

put

PSF image

Image convolved with Kernel

BJ02

e+,ex

Bernstein & Jarvis 2002; Hirata & Seljak 2003

shera mandelbaum et al 2011
SHERA Mandelbaum et al 2011

Deconvole HST psf, re-convolve SDSS PSF

SDSS pixelsize+SDSS noise

Reality is cruel!!

slide22

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conclusion
Conclusion
  • Accurate image processing is the first step for weak lensing study
  • Simulations to test your pipeline
  • We can use real data to do the comparison among various methods
  • Potential systematic from image itself
  • Moving to real data