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Estimation of spectral transmission of dried seaweed from its digital image

Estimation of spectral transmission characteristics of dried seaweed has been made starting with its digital image, that is, the RGB values. The present estimation method has steps comprising the capture of a digital transmission image and evaluation of the optical transmission characteristics of a seaweed sample for learning. Next, an estimation equation based on the information derived from the learning data is established, and an optical transmission curve of the seaweed sample is generated with the RGB values of its digital image according to the estimation equation. With this method, optical transmission curves have been estimated at the wavelength range 400–700 nm with a root mean square error of about 2%. In addition, the pigment content of seaweed has been also estimated successfully by means of the estimated transmission curve, though the result is only semiquantitative. © 2012 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.