It was recently reported in a Singapore daily that voyeurs are using mobile phones to take compromising pictures of unsuspecting victims in Singaporean MRTs. In fact, one man was so forthcoming that when the lady whose chest he was trying to take a picture of shifted her posture to block him, he merely moved to get better access, and seemed pleased that she was uncomfortable and scared. The victim said that she was not dressed provocatively, and was worried about what could be done with the pictures, especially with the current trend of moblogging and merging of ICTs.
According to SMRT authorities, reports of these incidences are low and that they rarely happen (but that could simply be because many of these cases go unreported as victims are not aware of their rights, and are unlikely to lodge such complaints due to the nature of Asian cultures). However, they do encourage commuters to lodge official complaints if such an incident does occur. According to lawyers, any man who takes a photo of a woman's cleavage can be charged for insulting her modesty, and that victims are protected under the law, as perpetrators can be jailed for up to a year, and fined for outraging her modesty.
If this is the case, then victims are indeed protected by the law and they should start speaking up if something like this ever happens to them.