2.1. Samples and hyperspectral imaging system
Digital color images of marbling standards were obtained by
scanning the NPPC official pork marbling standards with the resolution
of 150 dpi (dot per inch) by Canon scanner, as shown in
Fig. 1. The prediction models for pork marbling scores were developed
based on the analysis of these digital marbling standard
images.
The data used by Qiao et al. (2007) were employed in this study
to investigate marbling score estimation. Forty fresh pork loin samples,
ten of each of the RFN, PSE, PFN, and RSE quality group, were
captured by a hyperspectral imaging system in a wavelength range
of 400–1000 nm with a spectral resolution of 2.8 nm and a spot radius