Quality is a key factor for modern food industry because
the high-quality of product is the basis for success
in todays highly competitive market. In the food industry,
the quality evaluation still heavily depends on
manual inspection, which is tedious, laborious, and
costly, and is easily influenced by physiological factors,
inducing subjective and inconsistent evaluation results.
To satisfy the increased awareness, sophistication and
greater expectation of consumers, it is necessary to improve
quality evaluation of food products (Brosnan &
Sun, 2004). If quality evaluation is achieved automatically,
production speed and efficiency can be improved
in addition to the increased evaluation accuracy, with
an accompanying reduction in production costs (Sun
& Brosnan, 2003a).