slmsuite.holography.analysis.blob_detect

blob_detect(img, filter=None, plot=False, title='', fig=None, axs=None, zoom=False, show=False, **kwargs)[source]

Detect blobs in an image.

Wraps cv2.SimpleBlobDetector (see these links) Default parameters are optimized for bright spot detection on dark background, but can be changed with **kwargs.

Parameters

  • img (numpy.ndarray) – The image to perform blob detection on.

  • filter ({"dist_to_center", "max_amp"} OR None) – One of dist_to_center or max_amp.

  • plot (bool) – Whether to show a debug plot.

  • title (str) – Plot title.

  • fig (matplotlib.figure.Figure) – Figure for plotting.

  • axs (list of matplotlib.axes.Axis or matplotlib.axes.Axis) – Axes for plotting.

  • show (bool) – Whether or not to show the plot.

  • **kwargs – Extra arguments for cv2.SimpleBlobDetector.

Returns

  • blobs (ndarray) – List of blobs found by detector.

  • detector (cv2.SimpleBlobDetector) – A blob detector with customized parameters.