Bringing aerospace images into coincidence with subpixel accuracy by the local-correlation method

2004 ◽  
Vol 71 (5) ◽  
pp. 293
Author(s):  
A. S. Potapov ◽  
I. A. Malyshev ◽  
V. R. Lutsiv
Keyword(s):  
Correlation Method ◽  
Local Correlation ◽  
Subpixel Accuracy ◽  
Aerospace Images

Generalized Gradient Based Digital Image Correlation Method for Displacement with Subpixel Accuracy

2013 ◽  
Vol 444-445 ◽  
pp. 168-172
Author(s):  
Rui Zhang
Keyword(s):  
Digital Image ◽  
Correlation Method ◽  
Image Correlation ◽  
Intensity Change ◽  
Spatial Gradient ◽  
Change Model ◽  
Generalized Gradient ◽  
Illumination Variation ◽  
Subpixel Accuracy ◽  
Gradient Based

Basic principle of generalized gradient based digital image (DIC) method for subpixel-accuracy displacement measurement is discussed. The proposed method can cope well with lighting illumination variation or grayscale intensity change on the object surface during measurement by adopting a linear intensity change model, which overcomes the limitations in existing linear least squares based spatial gradient method by adopting constant model. To evaluate the proposed methods, both computer simulation and actual experiment have been carried out. The results show that the proposed method can measure displacement accurately even when substantial intensity variations exist in the experimental images.

Sign in / Sign up

Export Citation Format

Share Document