3. Numerical simulation

Numerical simulations were conducted to verify the effectiveness of the proposed technique. Figure 6 shows the amplitude and phase distributions of the object wave at each wavelength. As shown in Figure 6(b), a color object with rough surface was assumed. 640 and 532 nm were assumed as the wavelengths of the light sources. Red and green color components of a standard image "pepper" were used as amplitude images at 640 and 532 nm, respectively. In these simulations, the distance between the object and image sensor was assumed as 200 mm, pixel pitch was 5 μm, resolution was 10 bits, and number of pixels was 512 × 512. Figure 7 shows the images reconstructed by the proposed technique. Faithful images were reconstructed at each wavelength, and crosstalk between object waves with different wavelengths was not seen. The color synthesized image in Figure 7(c) indicates color 3D imaging ability. Thus, the validity of the proposed technique was numerically confirmed. Detailed numerical analyses and an experimental demonstration using an image sensor with 12-bit resolution were reported in Ref. [36].

Figure 6. Object wave for a numerical simulation. (a) Amplitude and (b) phase distributions of the object wave. Assumed amplitude images at the wavelengths of (c) 640 nm and (d) 532 nm.

Figure 7. Numerical results. Reconstructed images at the wavelengths of (a) 640 nm and (b) 532 nm. (c) Color synthesized image.
