Two simulated sea surfaces were generated by a numerical model. Each sea surface has a different power spectrum. I used the Pierson-Neumann theoretical spectrum for the generation of a first sea surface and the Pierson-Moskowitz theoretical spectrum for the generation of the second sea surface. The images were recorded on photographic film by means of a microdensitomer with a writing mode. To obtain the bidimensional power spectrum of these simulated sea surfaces, a coherent optical system was used. These power spectrum have information about frequencies in the highest energy peak and the direction that the waves have at a specific time. Both dimensional power spectrum are compared and optical autocorrelations for each sea surface along the directions parale and perpendicular to the wind were obtained respectively. Cross-correlation of the two simulated images of the sea surface were obtained. It was possible to obtain images at selected wavelenghts using different filters in the Fourier plane of the optical system. Because each sea surface has a Gaussian distribution, and the heights of the waves are totally random, the filter technique permit us to analyze the spatial behaviour of certain wavelenghts.
Josue Alvarez Borrego,
"Optical Analysis Of Two Simulated Images Of The Sea Surface", Proc. SPIE 0804, Advances in Image Processing, (14 October 1987); doi: 10.1117/12.941315; https://doi.org/10.1117/12.941315