Dissolved Organic Matters Impact on Colour Reconstruction in Underwater Images

Abstract

Abstract. The natural properties of water column usually affect underwater imagery by suppressing high-energy light. In application such as color correction of underwater images estimation of water column parameters is crucial. Diffuse attenuation coefficients are estimated and used for further processing of underwater taken data. The coefficients will give information on how fast light of different wavelengths decreases with increasing depth. Based on the exact depth measurements and data from a spectrometer the calculation of downwelling irradiance will be done. Chlorophyll concentration and a yellow substance factor contribute to a great variety of values of attenuation coefficients at different depth. By taking advantage of variations in depth, a method is presented to estimate the influence of dissolved organic matters and chlorophyll on color correction. Attenuation coefficients that depends on concentration of dissolved organic matters in water gives an indication on how well any spectral band is suited for color correction algorithm.

Use of commercial off-the-shelf digital cameras for scientific data acquisition and scene-specific color calibration

“…The limitations and merit of COTS cameras for scientific applications have previously been explored, albeit disjointly, in ecology [4], environmental sciences [5], systematics [6], animal coloration [7], dentistry [8], and underwater imaging [9,10]. Stevens et al [7] wrote: “… most current applications of digital photography to studies of animal coloration fail to utilize the full potential of the technology; more commonly, they yield data that are qualitative at best and uninterpretable at worst.” Our goal is to address this issue and make COTS cameras accessible to researchers from all disciplines as proper data-collection instruments.…”