Figure 1.

Diagram illustrating the SFDI acquisition process with respect to time, t. Each block represents an image acquired at a specific wavelength, λ_. After the first set of specified wavelengths has been imaged, the same wavelengths are then acquired with the following phase shift, Φ. After all phase shifts are complete, another set of wavelengths and phase shifts are then completed at the next specified spatial frequency until all required measurements are complete. Three phase-shifted images, *, are required to generate the demodulated reflectance images for each specified wavelength and frequency combination.