Abstract: The image quality of films taken by high-speed cameras is affected by shooting,developing and storing status.Recognization of matrix dots on poor quality films using traditional threshold method brings dots misread.In this paper,we present a concise method for automatic dot recogniaztion of dots on poor quality films.By using contrast and space criterions,and discussing parameters relative to them,the accuracy of dot recognization is increased.With this method,the fram recognition error rate is better than1/1000.