Performance. Means and standard deviations for time and error measures (10 repetitions) for exact and approximate PCA. Number of pixels c is given in % of the total number n. Running times (Intel Core Duo T6400, 2GHz) are for the entire Algorithm 3, including computation of probabilities. All measurements are for rank-k = 30 approximations, as we found that 20-30 components are typically sufficient to detect all glomeruli. Lower principal components only explain more of the noise (see also Figure 4).
Strauch and Galizia BMC Medical Informatics and Decision Making 2012 12(Suppl 1):S2 doi:10.1186/1472-6947-12-S1-S2