Abstract
A technique that combines the spatial resolution of a 3D structured-light (SL) imaging system with the spectral analysis of a hyperspectral short-wave near infrared system was developed for freshness predictions of gilthead sea bream on the first storage days (Days 0–6). This novel approach allows the hyperspectral analysis of very specific fish areas, which provides more information for freshness estimations. The SL system obtains a 3D reconstruction of fish, and an automatic method locates gilthead’s pupils and irises. Once these regions are positioned, the hyperspectral camera acquires spectral information and a multivariate statistical study is done. The best region is the pupil with an R2 of 0.92 and an RMSE of 0.651 for predictions. We conclude that the combination of 3D technology with the hyperspectral analysis offers plenty of potential and is a very promising technique to non destructively predict gilthead freshness.
Highlights
Annual fish consumption in Europe in 2013 was 23.2 kg [1], which gives an idea of just how big the fishing industry is
No difference was reported for the Total Volatile Basic Nitrogen (TVB-N) and pH values on the first three days, which agrees with results obtained by other authors [4,5,10]
This study focused on combining a 3D structured light system with a hyperspectral imaging system to solve the problem of non destructively estimating Sparus aurata freshness
Summary
Annual fish consumption in Europe in 2013 was 23.2 kg [1], which gives an idea of just how big the fishing industry is. As in all food industries, product safety and quality are top priorities in the fishing industry. Fish freshness is extremely important [2] because fishery products are highly perishable and spoil quickly in only a few days if not submitted to a food preservation process. The shelf life of fish is defined as the complete period during which fish is considered fit for human consumption [3]. The shelf life of fish is a critical quality aspect that must be assured. Techniques like Total Volatile Basic Nitrogen (TVB-N) and microbiological tests could be used
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