Table 1.

Mathematical function symbol comparison table.

Mathematics symbol	Meaning and explanation
XS, YS, XT, $X_{S^{+}}$, XU	Source domain, label domain of source domain, target domain, enhanced domain, union of source domain and enhanced domain (new source domain);
xs, $x_{s^{+}}$, ys	Image of source domain, image of augmented domain, label of image of source domain;
Q, G	Encoder function, decoder function;
$p_{x_s}^m$, $p_{x_t}^m$, $p_{x_u}^m$, $p_{x_s}^b$, $p_{x_t}^b$, $p_{x_{s^{+}}}^b$, $p_{x_u}^b$	Mask prediction for source domain images, mask prediction for target domain images, mask prediction for union images of source and enhanced domains, boundary prediction for source domain images, boundary prediction for target domain images, boundary prediction of enhanced domain images, boundary prediction for union images of source and enhanced domains;
Db, $D_{b^{+}}$, Dm	Discriminator (see Section 2.2 for the corresponding function of the discriminator).