Real-Time Depth-Based Hand Detection and Tracking

Algorithm 4

Algorithm for region growth.

Input: TP^seed_𝑡,Th_𝑑,Th_GD

Initialize: 𝐵=∅, temp𝐵=∅, VB=∅, UVB=∅

Th_𝑐←2ndpolynomialmodel(Dep_TP)

𝐵←AddTP^seed_𝑡

while 𝐵_size>0

  for 𝑖=0 to 𝑖<𝐵_size

   𝑐=𝐵[𝑖]_𝑥,𝑟=𝐵[𝑖]_𝑦

    for 𝑚=𝑟−1 to 𝑚≤𝑟+1

     for 𝑛=𝑐−1 to 𝑛≤𝑐+1

      if (Cond_all)

       tmp𝐵← Add Point (𝑛,𝑚)

      else

       if (Cond₁≠1)

         VB← Add Point (𝑛,𝑚)

       else

         UVB← Add Point (𝑛,𝑚)

       end if

      end if

     end

    end

  end

  swap(𝐵,tmp𝐵)

  tmp𝐵=∅

  Grow_cnt=Grow_cnt+1

Output: VB, UVB