Abstract: This is a EU research project with an investment about 1.3 million EU dollars. From 1997 to 2000, three EU countries, four Universities and two large industrial companies were involved in the project. The main contents in the project are :(1) Set up a image acquisition system. (2) Image processing and sementation. (3) Image analysis and mineral concentration modeling. (4) Production (processing) control. The key of the project is to use computer vision, instead of human eyes, to monitor the variation of mineral froth in real time, and the research results have been applied into industry. Currently, there are about thirteen computer vision systems have been used in European countries.