Hyperspectral imaging of the degradation of meat and comparison with necrotic tissue in human wounds

The objective evaluation of scattering tissue and the discrimination of tissue types is an issue that cannot besolved with colour cameras and image processing alone in many cases. Examples can be found in the determination offreshness and ageing of meat, and the discrimination of tissue types in food technology. In medical applications tissuediscrimination is also an issue, e.g. in wound diagnostics. A novel hyperspectral imaging setup with powerful signalanalysis algorithms is presented which is capable of addressing these topics. The spectral approach allows the chemicalanalysis of material and tissues and the measurement of their temporal change. We present a method of hyperspectralimaging in the visible-near infrared range which allows both the separation and spatial allocation of different tissue typesin a sample, as well as the temporal changes of the tissue as an effect of ageing. To prove the capability of the method,the ageing of meat (slices of pork) was measured and, as a medical example, the application of the hyperspectral imagingsetup for the recording of wound tissue is presented. The method shows the ability to discriminate the different tissuecomponents of pork meat, and the ageing of the meat is observable as changes in spectral features. An additional result of our study is the fact that some spectral features, which seem to be typical for the ageing of the meat, are similar to thoseobserved in the necrotic tissue from wound diagnostics in medicine.