High-precision image-drift-correction method for EM images with a low signal-to-noise ratio.
The phase correlation method (PCM) is well known for high-precision matching between images. However, if the signal-to-noise ratio of an image is low, the method is difficult to apply. To solve this problem, we developed an improved PCM that can match images automatically with sub-pixel matching precision. Using this method, a 0.2-nm crystal lattice spacing was clearly revealed after 10 blurred images were processed in a verification experiment; such a lattice could not be recognized or hardly be recognized in each individual image.
Naka Division, Hitachi High-Technologies Corporation, 882 Ichige, Hitachinaka, Ibaraki 312-8504, Japan.
Shigeto
S
Isakozawa
Major of Informatics, Graduate School, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan.
Sachihiko
S
Tomonaga
Naka Division, Hitachi High-Technologies Corporation, 882 Ichige, Hitachinaka, Ibaraki 312-8504, Japan.
Takahito
T
Hashimoto
Major of Informatics, Graduate School, Kogakuin University, 2665-1 Nakano, Hachioji, Tokyo 192-0015, Japan baban@cc.kogakuin.ac.jp.
Norio
N
Baba
D000465:Algorithms; D007091:Image Processing, Computer-Assisted / Q000379:methods*; D008854:Microscopy, Electron / Q000379:methods*; D059629:Signal-To-Noise Ratio; D013048:Specimen Handling / Q000379:methods
drift-correction; image alignment; image gradient; image integration; phase correlation; phase image