Fitting of Atomic Force Microscopy Force Curves with a Sparse Representation Model

Figure 1

(a) The schematic illustration of the WLC model (only the term in the parenthesis, without the coefficient term). The green thin curve represents the whole theoretical WLC model, which exhibits an asymptotic behavior with asymptote (the right dotted vertical line). The red bold curve represents the truncated version, which constitutes the matrix F. (b) A typical force curve sample from CNGA1 data. (c) The force curve after preprocessing. (d), (e) The fitting results with five and six WLC pieces, respectively. (f) The fitting results with Maity et al.’s method [10], each blue point is a solution , and red vertical lines represent centers/means of each cluster.

(a)

(b)

(c)

(d)

(e)

(f)