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+# ---
+# cover: assets/regiongrowing.gif
+# title: Region Growing Algorithm
+# description: This demo shows how to use the region growing algorithm to segment an image.
+# author: Ashwani Rathee
+# date: 2021-08-25
+# ---
+
+# Region Growing Algorithm is a procedure that groups pixels or sub regions
+# into a larger regions. We use principle of similiarity to group similar pixels.
+# Principle of similiarity states that a region is coherent if all the pixels of that
+# region are homogeneous and criterion of homogenity could be glcm, color, texture
+# shape and model etc
+
+# Major steps in a region growing algorithm:
+# - Selection of initial seed
+# - Seed Growing Criteria
+# - Termination of the segmentation process
+
+# In this demonstration, we will segment an image using the region growing algorithm.
+# There are two methods to do region growing - the first one is the seeded region growing method,
+# second one is the unseeded region growing method.
+
+using Images
+using ImageSegmentation
+using Random
+
+function get_random_color(seed)
+    Random.seed!(seed)
+    rand(RGB{N0f8})
+end
+
+# ## Seeded Region Growing
+
+# Seeded region growing segments an image with respect to some user-defined seeds.
+# Each seed is a `(position, label)`` tuple, where `position` is a `CartesianIndex` and
+# label is a positive integer. Each label corresponds to a unique partition of 
+# the image. The algorithm tries to assign these labels to each of the remaining 
+# points. If more than one point has the same label then they will be contribute
+# to the same segment.
+
+img = load("assets/worm.jpg")
+img_small = zeros(Gray{N0f8},5,5)
+img_small[2,2] = 1.0
+img_small[2,3] = 1.0
+img_small[3,2] = 1.0
+img_small[2,4] = 1.0
+img_small[4,2] = 1.0
+img_small[4,4] = 0.9
+
+img_small
+
+# These below are user defined seeds that will be used in the region growing algorithm.
+
+
+seeds = [(CartesianIndex(104, 48), 1), (CartesianIndex( 49, 40), 1),
+                (CartesianIndex( 72,131), 1), (CartesianIndex(109,217), 1),
+                (CartesianIndex( 28, 87), 2), (CartesianIndex( 64,201), 2),
+                (CartesianIndex(104, 72), 2), (CartesianIndex( 86,138), 2)]; # seeds for worm image
+seeds_small = [(CartesianIndex(3,2),1),(CartesianIndex(3,3),2),(CartesianIndex(4,4),3)] # seed for img_small
+
+# Now, let's segment this image using seeded_region_growing. First for the img_small then worm image.
+
+seg_small = seeded_region_growing(img_small, seeds_small)
+result = map(i->get_random_color(i), labels_map(seg_small)) .* (1 .-Gray.(img_small))
+
+# Let's see results for worm case..
+
+seg = seeded_region_growing(img, seeds)
+result = map(i->get_random_color(i), labels_map(seg)) .* (1 .-Gray.(img))
+
+# Let's see labels_map results which were then used in the seg_small case.
+
+labels_map(seg_small)
+
+# ## Unseeded region growing
+
+# This algorithm is similar to [Seeded Region Growing](@ref) but does not require
+# any prior information about the seed points. The segmentation process initializes
+# with region ``A_1`` containing a single pixel of the image. Let an intermediate state
+# of the algorithm consist of a set of identified regions ``A_1, A_2, ..., A_n``.
+# Let ``T`` be the set of all unallocated pixels which borders at least one of these
+# regions. The growing process involves selecting a point ``z \in T`` and region ``A_j``
+# where ``j \in [ 1,n ] `` such that
+
+# ```math
+# \delta(z, A_j)= \min_{x \in T, k \in [ 1,n ] } \{ \delta(x, A_k)\}
+# ```
+# where `` \delta(x, A_i)= | \operatorname{img}(x) - \operatorname{mean}_{y \in A_i} [ \operatorname{img}(y) ] |``
+
+# If ``\delta(z, A_j)`` is less than `threshold` then the pixel `z` is added to ``A_j``.
+# Otherwise we choose the most similar region ``\alpha`` such that
+
+# ```math
+# \alpha = \argmin_{A_k} \{ \delta(z, A_k) \}
+# ```
+# If ``\delta(z, \alpha)`` is less than `threshold` then the pixel `z` is added to ``\alpha``.
+# If neither of the two conditions is satisfied, then the pixel is assigned a new region ``A_{n+1}``.
+# After assignment of ``z``, we update the statistic of the assigned region. The algorithm halts when
+# all the pixels have been assigned to some region.
+
+# `unseeded_region_growing` requires the image `img` and `threshold` as its parameters.
+
+img_src = load("assets/worm.jpg")
+
+# Now, let's segment this image using unseeded_region_growing
+
+seg_small = unseeded_region_growing(img_small, 0.05) # here 0.05 is the threshold
+result = map(i->get_random_color(i), labels_map(seg_small)) .* (1 .-Gray.(img_small))
+
+# Let's see results for worm case..
+
+seg = unseeded_region_growing(img_src, 0.5) # here 0.05 is the threshold
+result = map(i->get_random_color(i), labels_map(seg)) .* (1 .-Gray.(img_src))
+
+# Let's see labels_map results which were then used in the seg_small case.
+
+labels_map(seg_small)
+
+save("assets/regiongrowing.gif", cat(img, result; dims=3); fps=1) #src