find_peaks#
- gammapy.estimators.utils.find_peaks(image, threshold, min_distance=1)[source]#
Find local peaks in an image.
This is a very simple peak finder, that finds local peaks (i.e. maxima) in images above a given
threshold
within a givenmin_distance
around each given pixel.If you get multiple spurious detections near a peak, usually it’s best to smooth the image a bit, or to compute it using a different method in the first place to result in a smooth image. You can also increase the
min_distance
parameter.The output table contains one row per peak and the following columns:
x
andy
are the pixel coordinates (first pixel at zero)ra
anddec
are the RA / DEC sky coordinates (ICRS frame)value
is the pixel value
It is sorted by peak value, starting with the highest value.
If there are no pixel values above the threshold, an empty table is returned.
There are more featureful peak finding and source detection methods e.g. in the
photutils
orscikit-image
Python packages.- Parameters
- Returns
- output
Table
Table with parameters of detected peaks
- output