The UN's International Telecommunication Union (ITU) discussed the standard in May and offered broadcasters the opportunity to file objections. Because no-one did, it sent out letters at the end of last week confirming the format's approval.
A press release from NHK said the specification would "reproduce the feeling of life and offer a sense of being present" in a way that had been impossible to do before. The news was first reported by Techworld.
NHK has used a 145-inch (3.7 metre) prototype display co-developed with Panasonic to show off its footage.
But it will be some time before such models become commercially available.
TV makers are currently focusing efforts on launching 4K enabled devices offering half the resolution. This is the format currently used by most digital cinema cameras.
LG unveiled the biggest 4K television set to date earlier this week - an 84 inch screen costing more than $22,000.
But manufacturers are likely to want to offer 8K screens by 2020 when NHK aims to begin its first experimental broadcasts in the standard
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