Study a new method for detecting fish freshness. During the experiment, we choose freshest fish-eyes images via digital
camera to add computing the synthesis of the latest fish-eye image .Next figure out every image’s signal strength. Finally,
we analysis relation between the change of the image’s energy and the value (pH, electrical conductivity, TVBN) by
Modeling of Partial Least Squares Regression. The result shows that we can detect freshness of fish quickly,
conveniently, simply and accurately through the fish-eye image energy change.