Fig. 7.

Value of the minimized objective function $u({\mu }_{\mathrm{a}})$ (first row), relative errors of the estimates $E(\%)$ (second row), and the number of photon packets $P$ (third row) as a function of iteration evaluated with the S-SGN (blue solid line) and A-SGN (red dashed line) methods. In the columns from left to right: the photon budget was ${10}^3$ (first column), ${10}^4$ (second column), and ${10}^5$ (third column). The domain was illuminated from all boundaries.