imgmoment

Synopsis

Computes image moments

imgmoment  infile [x_mu] [y_mu] [m_x_y] [phi] [eccen] [x_sig] [y_mu]

Description

The "imgmoment" tool computes up to the second moment of an image. It computes the ellipticity and angle, then computes the '1sigma' radius along each axis. The calculated values are stored in the parameter file.

Example

imgmoment img.fits[sky=circle(100,100,10)]
pget imgmoment x_mu y_mu

Computes the moments of the image in 'img.fts' in the region defined by the specified circle. The centroid (x_mu,y_mu) is then retrieved using the pget utility.

Parameters

Detailed Parameter Descriptions

Parameter=infile (file required filetype=input)

Input image file

Parameter=x_mu (real filetype=output)

X-centroid (physical coordinates)

Parameter=y_mu (real filetype=output)

Y-centroid (physical coordinates)

Parameter=m_x_y (real filetype=output)

The x-th and y-th order moment. m_0_0 is sum of pixel values. x and y go from 0 to 2.

Parameter=phi (real filetype=output)

Ellipse angle based on moments

Parameter=eccen (real filetype=output)

Ellipse eccentricity based on moments.

Parameter=x_sig (real filetype=output)

Rotated image by -phi; sigma along (rotated) x-axis.

Parameter=y_mu (real filetype=output)

Rotated image by -phi; sigma along (rotated) y-axis.

Changes in CIAO 4.4

• imgmoment computes up to the second moment of an image.

Bugs

There are no known bugs for this tool.

See Also

dm

dmfiltering

tools

dmappend, dmcontour, dmellipse, dmfilth, dmimg2jpg, dmimgadapt, dmimgblob, dmimgcalc, dmimgdist, dmimgfilt, dmimghist, dmimghull, dmimglasso, dmimgpick, dmimgpm, dmimgproject, dmimgreproject, dmimgthresh, dmmaskbin, dmmaskfill, dmnautilus, dmregrid, dmregrid2, dmstat, evalpos, get_fov_limits, get_sky_limits, mean_energy_map, pileup_map