|
#
|
A sequential number for the measurement
|
|
Image
|
The name of the image that was measured
|
|
Obj
|
The source number. If sources touch and are merged
during the detection process, one of the numbers is discarded,
making the Obj values generally not a continuous sequence.
|
|
<X>
|
The mean X position, measured in world
coordinates. If Precision Centroid or
Precision FWHM is checked on the
Post-process page, this is measured in the same way
as an interactively marked centroid using the settings on the
Centroid page.
|
|
<Y>
|
The mean Y position, measured in world
coordinates. If Precision Centroid or
Precision FWHM is checked on the
Post-process page, this is measured in the same way
as an interactively marked centroid using the settings on the
Centroid page.
|
|
Col
|
The mean Column position, measured in pixel
coordinates. If Precision Centroid or
Precision FWHM is checked on the
Post-process page, this is measured in the same way
as an interactively marked centroid using the settings on the
Centroid page.
|
|
Row
|
The mean Row position, measured in pixel
coordinates. If Precision Centroid or
Precision FWHM is checked on the
Post-process page, this is measured in the same way
as an interactively marked centroid using the settings on the
Centroid page.
|
|
Total Lum
|
The total luminosity (intensity) of the source
relative to zero. This value disregards the background setting but,
as with all properties, includes only those pixels that
satisfy the threshold condition on the
Detect page.
|
|
Net Lum
|
The net luminosity (intensity) of the source above
the background. If you think of pixel value as defining a 3
dimensional surface, the Lum value is
the volume of the surface above the background as configured on the
Background page. However, pixels are only included in
this volume if their value satisfies the threshold condition on the
Detect page.
|
|
Mean Lum
|
The net luminosity (Net Lum value)
divided by the area.
|
|
Std Dev
|
The standard deviation of the net luminosity
(Net Lum value).
|
|
Ellip
|
The ellipticity, measured as 1 – (minor axis /
major axis).
|
|
Angle
|
The angle of the major axis relative to the
positive X axis (0 degrees), increasing through the positive Y axis
(90 degrees). The angle is adjusted to fall in the range -90 to +90
degrees.
|
|
Area
|
The area, in pixels, of the source above the
threshold. This is threshold dependent.
|
|
Maximum
|
The maximum intensity. This is the pixel value of
the highest pixel inside the source.
|
|
Minimum
|
The minimum intensity. This is the pixel value for
the threshold value above the background.
|
|
FWHM
(Precision FWHM)
|
The Full Width at Half maximum brightness. This
measures the point spread function of the source profile. This is
reported only of the
Precision FWHM option is checked on the
Post-process page.
|
|
CI
|
Concentration Index. This is the ratio of the
Effective Diameter divided by 2 times the radius of gyration. The
Effective diameter is the diameter of a circle having the same
area. The radius of gyration is the radius for the second moment of
the intensity distribution (analogous to the moment of inertia of a
rotating mass distribution). This is threshold dependent.
|
|
Major Axis
|
The major axis length in units of pixels. This is
threshold dependent.
|
|
Minor Axis
|
The minor axis length in units of pixels. This is
threshold dependent.
|
|
Kurtosis
|
The source profile kurtosis. This measures the
"flatness" of the intensity distribution.
|
|
X Skew
|
The source profile skewness in the X direction.
This measures the asymmetry of the intensity distribution.
|
|
Y Skew
|
The source profile skewness in the Y direction.
This measures the asymmetry of the intensity distribution.
|
|
Background
|
The background value evaluated at the average
position of the source (at <X>
and <Y>).
|
|
Mag
(Aperture Photometry)
|
The magnitude of the source above its local
background. It is integrated within an elliptical aperture
surrounding the object. The Zero point value specified in the
Aperture Photometry Setup dialog is also
applied. This value and its related measurements are reported only
if the
Aperture Photometry option is checked on the
Post-process page.
|
|
Error
(Aperture Photometry)
|
The uncertainty in the magnitude (Mag). This is computed using the signal and an
error estimate based on variation in the pixel values inside the
background annulus surrounding the source.
|
|
Error(T)
(Aperture Photometry)
|
The theoretical estimate of the uncertainty in the
magnitude (Mag). This is computed
using signal at each point along with the gain, readout noise, and
exposure time for the image.
|
|
Net Count
(Aperture Photometry)
|
The total signal of the source above its local
background. This is also known as "count volume". It is integrated
within an elliptical aperture surrounding the object, and is used
to compute the magnitude.
|
|
S/N
(Aperture Photometry)
|
The Signal To Noise ratio for the detected signal
inside the aperture that measures the magnitude and net count.
|
|
Bg Local
(Aperture Photometry)
|
The precision background measured from pixels
inside the annulus between the inner and outer background
apertures. This is more accurate for a precision intensity
measurement than is obtained using the
Background surface value at the position of the
source. This value is effective at the center position of the
object.
|
|
FWHM Peak
(Precision FWHM)
|
The Peak value (above background) from the FWHM
calculation. This is measured only if FWHM is selected in the
post-processing options. This is not threshold dependent. This is
reported only of the
Precision FWHM option is checked on the
Post-process page.
|
|
FWHM Bg
(Precision FWHM)
|
The background value from the FWHM calculation.
This is measured only if FWHM is selected in the post-processing
options. This is not threshold dependent. Compare its value with
the computed background value based
on the
Background strategy. This is reported only of the
Precision FWHM option is checked on the
Post-process page.
|
|
Min X
|
The minimum Column position of the source.
|
|
Max X
|
The maximum Column position of the source.
|
|
Min Y
|
The minimum Row position of the source.
|
|
Max Y
|
The maximum Row position of the source.
|
|
X at Min Y
|
The Column position at the minimum Row position of
the source.
|
|
X at Max Y
|
The Column position at the maximum Row position of
the source.
|
|
Y at Min X
|
The Row position at the minimum Column position of
the source.
|
|
Y at Max X
|
The Row position at the maximum Column position of
the source.
|
|
X at Min Lum
|
The Column position at the minimum Intensity of
the source.
|
|
X at Max Lum
|
The Column position at the minimum Intensity of
the source.
|
|
Y at Min Lum
|
The Row position at the minimum Intensity of the
source.
|
|
Y at Max Lum
|
The Row position at the minimum Intensity of the
source.
|
Mira Pro x64 User's Guide, Copyright Ⓒ 2023 Mirametrics, Inc. All
Rights Reserved.
