If your image comes through blurry, this could be due to dim lighting in the fridge. Try enabling the flash in Settings.
This could also be caused by dirt and condensation build up on the lens when the door is opened.
The FridgeCam has an innovative solution within the camera lens itself to minimise the effect of fogging. However, if the door has been left open for a prolonged period of time or is dirty, condensation may appear.
This can be avoided by ensuring the fridge door is not left open for long periods of time to evade the prolonged change in air temperature and keeping the camera lens dirt/dust free by using a lens wipe. If you do see fog, it will clear itself due to the anti-fog technology in the lens and will continue to capture clear and sharp images.