Nokia's unannounced Lumia PureView EOS smartphone has apparently been glimpsed in a leaked photograph, Digital Spy said.

ViziLeaks outed the image of the handset, which is said to feature a whopping 20-megapixel camera similar to the one found on the 808 PureView.

The Nordic phone-maker is believed to have been working on a Lumia handset with a high-end camera on board for some time, with previous rumours suggesting the mystery smartphone would include a 41-megapixel snapper.

The Lumia PureView EOS is expected to run the Windows Phone 8 operating system, but hardware specs are yet to surface.

Nokia launched the Lumia 925 smartphone last month, a flagship handset with a PureView 8.7-megapixel camera on board and a range of smart photography features.

The Nokia Lumia PureView EOS is expected to arrive on the market later this year.