Table 2 Definition of \(\phi _{1}^{0}(x,y), \phi _{2}^{0}(x,y)\)

//Initialization

for y←0 to H−1 do

for x←0 to W−1 do

\(\phi _{1}^{0}(x,y) = \rho \), \(\phi _{2}^{0}(x,y) = \rho \)

repeat

x←x+1

endfor

repeat

y←y+1

endfor

//Evaluation 1

for y←y _min to y _max do

for x←x _min to x _max do

\(\phi _{1}^{0}(x,y) = - \rho \), \(\phi _{2}^{0}(x+1,y) = - \rho \)

repeat

x←x+2

endfor

repeat

y←y+2

endfor

//Evaluation 2

for y←y _min+1 to y _max do

for x←x _min to x _max do

\(\phi _{1}^{0}(x,y) = - \rho \), \(\phi _{2}^{0}(x+1,y) = - \rho \)

repeat

x←x+2

endfor

repeat

y←y+2

endfor

//ROI clipped

ϕ ₁=ϕ ₁·R

ϕ ₂=ϕ ₂·R