Watershed 2.0.3

An image segmentation algorithm based on the watershed paradigm

Consult the module API page at

https://engineering.purdue.edu/kak/distWatershed/Watershed-2.0.3.html

for all information related to this module, including information related to the latest changes to the code. The page at the URL shown above lists all of the module functionality you can invoke in your own code. That page also describes how you can directly access the segmented blobs in your own code and how you can apply a color filter to an image before its segmentation.

With regard to the basic purpose of the module, it is a Python implementation of the Watershed algorithm for image segmentation. The goal of this module is not to compete with the popular OpenCV implementation of the watershed algorithm. On the other hand, the goal here is to provide an alternative framework that is more amenable to experimentation with the logic of watershed segmentation.

Typical usage syntax:

    from Watershed import *
    shed = Watershed(
               data_image = "orchid0001.jpg",
               binary_or_gray_or_color = "color",
               size_for_calculations = 128,
               sigma = 1,
               gradient_threshold_as_fraction = 0.1,
               level_decimation_factor = 16,
               padding = 20,
           )
    shed.extract_data_pixels()
    shed.display_data_image()
    shed.mark_image_regions_for_gradient_mods()                     #(A)
    shed.compute_gradient_image()
    shed.modify_gradients_with_marker_minima()                      #(B)
    shed.compute_Z_level_sets_for_gradient_image()
    shed.propagate_influence_zones_from_bottom_to_top_of_Z_levels()
    shed.display_watershed()
    shed.display_watershed_in_color()
    shed.extract_watershed_contours_seperated()
    shed.display_watershed_contours_in_color()

The statements in lines (A) and (B) are needed only for marker-assisted
segmentation with the module.  For a fully automated implemented of the
BLM algorithm, you would need to delete those two statements.