Calibration of Measuring Systems for the Expert Evaluation of Color Characteristics

Results of the development of the portable mobile color analyzer for sample surfaces using a digital camera are presented. The special program computes and analyzes the color characteristics of samples. The dominant wavelength and the saturation for each pixel as well as for the selected fragment of the digital image are calculated using the spectrum locus. To get the perfect linear color reproduction, the correction factors are introduced. Using the reference color atlas we define factors and carry out the calibration of analyzer′s measuring system by them. The special corrective procedure for the algorithm of the dominant wavelength calculation which enhances the accuracy for spectral colors up to ± 2.5 nm is elaborated. We tested the analyzer in experiments with meat samples produced at the poultry plants. The dominant wavelength could be used for recognizing meat quality characteristics. Experimental results demonstrated the significant differences in data for meat samples of different plants, and they indicated the real storage time of meat.