Fig. 1. Off-axis digital holographic setup in image plane configuration. The object is located inside a tube with a length of 27 m filled with ultrasonically generated water mist.

Fig. 2. Two life-size styrofoam heads used as test objects.

Fig. 3. (a) Digitally recorded hologram; (b) absolute value of Fourier-spectrum of (a) calculated using FFT algorithm.

Fig. 4. Imaging of one head in clear view: Photography (a); holographic reconstruction of one of the fundamental holograms (b); wrapped phase map of synthetic hologram (c); sin-cos filtered wrapped phase map (d); unwrapped phase map (e); false-color image with scale (f).

Fig. 5. Holographic measurements through fog at 4.0 AL: holographic reconstruction (a); synthetic phase map (b); sin–cos filtered synthetic phase map (c).

Fig. 6. Filtered synthetic phase images, reconstructed amplitude and conventional images at different fog densities: dense fog (a); intermediate fog (b); light fog (c), the gray scale values in the phase maps ranging from −π to π correspond to half the synthetic wavelength, i.e. approx. 300 mm.