title: Two improved algorithms with which to obtain contoured windows for fringe patterns generated by electronic speckle-pattern interferometry.
abstract: Fringe patterns generated by electronic speckle-pattern interferometry are full of high-spatial-frequency and high-contrast speckle noise. Filtering with contoured windows has proved to be an efficient approach to filtering out speckle noise while retaining the fringe patterns. Furthermore, with contoured windows the contoured correlation fringe pattern method can be used to derive smooth, normalized, consistent fringes. Contoured windows previously were determined by fringe orientation only, and this process generated accumulated errors. We propose two new algorithms with which to obtain the contoured windows according to the fringe intensity slope and the distance ratio to neighboring skeletons. These new techniques can determine contoured windows more precisely.
authors.affiliation: College of Optical Engineering, College of Astronautics, National University of Defense Technology, Changsha, Hunan 410073, China. yuqifeng@vip.sina.com
authors.forename: Qifeng
authors.initials: Q
authors.lastname: Yu
authors.forename: Xia
authors.initials: X
authors.lastname: Yang
authors.forename: Sihua
authors.initials: S
authors.lastname: Fu
authors.forename: Xiangyi
authors.initials: X
authors.lastname: Sun
mesh_terms: D000465:Algorithms; D044962:Data Compression / Q000379:methods*; D007089:Image Enhancement / Q000379:methods*; D007368:Interferometry / Q000379:methods*; D010363:Pattern Recognition, Automated / Q000379:methods*; D012031:Refractometry / Q000379:methods*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted