The MATLAB polar coordinate is converted to the straight coordinate, which is very simple but does not get the correct data.

% Extract the Iris area from figure 1 and place it in the rectangle final14

Final14 = zeros (64,512); % defines a rectangle

For I = 1: 64
For J = 1:512
Rad = J * 2 * PI/512;
Xpos3 = round (I + R11) * Cos (RAD) + row11); % R11 is the inner circle radius, (row11, col11) is the original radius (inside and outer circle concentric)
Ypos3 = round (I + R11) * sin (RAD) + col11 );
Final14 (I, j) = final13 (xpos3, ypos3); % is final13, and figure 2 is final14. As shown in figure 2, fianl14 does not obtain the iris part in final13.

End

End

Figure 1

Figure 2