Abstract: This paper presents a new method for oil acid value detection combining traditional chemical titration with image processing technology. The process of titration and getting image is manipulated by single chip microcomputer. Then the image is sent to computer to process further by using digital image processing technology, the color information within is extracted. Afteranalyzing and comparing the color information, the twinkling is captured as the titration end when the color changes obviously, then according to the quantity of reagent, the oil acid value is calculated with relevant formula by computer. The information is feedback into the single chip microcomputer system to control the actuator. By this method, one can implement the automatic detection and control of oil acid value conveniently, objectively and correctly.

Key words: oil acid value detection, single chip microcomputer control, digital image processing