Google Research

Estimating the Spectral Reflectance of Natural Imagery Using Color Image Features

  • Josh Hyman
  • Mark Hansen
  • Eric Graham
  • Deborah Estrin
Workshop on Applications, Systems, and Algorithms for Image Sensing (2008)


Relative spectral reflectance is an illumination invariant image feature that is related to many ecological phenomena that are difficult to measure, such as plant CO2 uptake. We describe a procedure to estimate the relative spectral reflectance of known subject using color image features. Through application, we show that this procedure produces accurate estimates in the presence of changing field conditions. Using this procedure, we can use imagers as sensors to measure natural phenomena that cannot be easily measured using any other available sensing modality.

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