  We demonstrate a simple technique for microwave field imaging using alkali
atoms in a vapor cell. The microwave field to be measured drives Rabi
oscillations on atomic hyperfine transitions, which are detected in a spatially
resolved way using a laser beam and a camera. Our vapor cell geometry enables
single-shot recording of two-dimensional microwave field images with 350 {\mu}m
spatial resolution. Using microfabricated vapor cell arrays, a resolution of a
few micrometers seems feasible. All vector components of the microwave magnetic
field can be imaged. Our apparatus is simple and compact and does not require
cryogenics or ultra-high vacuum.
