Visual assessment was conducted immediately after image acquisition. The assessment was
based on browning scale as described by Nguyen et al (2003). The browning scale was rated
as follows: 1 = no chilling injury symptoms appear; 2 = mild chilling injury symptoms in which
the injury can be found in between the epidermal tissues; 3 = moderate chilling injury symptoms
in which the brown patches begin to become visible, larger and darker; 4 = severe chilling
injury symptoms in which the brown patches are visible, larger and darker than at scale 3; 5 =
very severe chilling injury symptoms in which the patches are relatively large on the surface.