supported by the National Natural Science Foundation of China(Grant No.50676055);sponsored by Shanghai Rising-Star Program(Grant No.07QA1405);supported by Program for New Century Ex-cellent Talents in University(NCET-10-0605)
The gray of two images of a same particle taken by a digital camera with different exposure times is different too. Based on the gray difference of particle images in a double-exposed photo and autocorrelation process...