Registration: At least one author should register by October 1st (deadline of camera ready) to have your paper included in the proceedings.
A full conference registration can cover multiple papers only if the registered person is an author on the paper.
Regular and student registrations can cover papers accepted to both the main conference and workshops.
However, workshop registration is can only be used for papers accepted at a workshop. If you need a visa letter you can request this as part of the registration procedure. @

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Details can be found in the ACCV2014 homepage . Please go to that page to find the link