I knew that it required mask protos value on the postproc function.
I found mask informations at netron and
i found I have two outputs into segmentation model through Netron website.
so, when i parsed to onnx model at dfc1_parsing_example,
I have been entered two endnodes name into translate function.
(before write topic, I entered only one output.)
and, I exported to hef file that applied two output node names.
then, the newly generated hef file works on my coustom segmentation model.
Finally, After resolved, I provide the method I discovered.