Two-dimensional correlation is equivalent to two-dimensional convolution with the filter matrix rotated 180 degrees. See the Algorithm section for more information about how filter2 performs linear filtering.
维基百科Coefficient of determination（也就是R方）有明确的解释： “ In linear least squares multiple regression with an estimated intercept term, R^2 equals the square of the Pearson correlation coefficient between the observed y and modeled (predicted) f data values of the dependent variable.”
Digital Image Correlation (DIC) is a full-field image analysis method, based on grey value digital images, that can determine the contour and the displacements of an object under load in three dimensions.
