This is a common misconception about Ozu's style. He rarely used low angles. He did, however, prefer a low camera height and would shoot most objects 2/3 rds of the way down from its centre. The tatami mat thing is also a misconception that many people make. If you look at the films carefully a lot of the time the camera height will be much lower than anyone seated on a tatami mat.
The A-Z of Ozu
A bluffers' guide to the films of Yasujiro Ozu
J is for...
Ozu’s mature films offer a distinctly Japanese contemplative mood and their interests barely stretch beyond bourgeois suburbanites. Yet it’s still misleading to see Ozu as a staunch Japanese traditionalist. His earlier comedies and gangster flicks reflect an international influence, while his post-war films firmly resist any nostalgic backward-looking values.