Evaluation of Variability of Instruments Used in Pork Loin Quality Assessments

Machine Vision Requires Fewer Repeat Measurements than Colorimeters for Precise Seafood Colour Measurement

“…However, colorimeter results may also be impacted by edge loss, which is defined as the loss of illuminant from the sample if it scatters outside the area of the aperture [53]. There may also have been some variability in the colorimeters due to pressing the sample too hard, or due to small gaps between the sample surface and the detector, allowing light in and out [35]. Sample heterogeneity, and possibly variations in illumination and pressure, likely contributed to the colorimeters requiring more repeat measurements.…”

“…The nature of the material being measured and the retail display environment determine the instrument settings, such as whether to include specular reflection and choice of illuminant, which all influence the measured colour [11,27,30,34]. Colour measurements are also influenced by sample thickness, background colour behind a sample, the pressure of the colorimeter on the sample, differences in myofibril orientation, and external light [13,35,36]. Finally, many colorimeters, such as the Minolta CR400 and the Nix Pro, require that the sample covers the entire aperture, hence the aperture size becomes important relative to the surface area to be measured.…”