Improved Glowworm Swarm Optimization Algorithm for Multilevel Color Image Thresholding Problem

Figure 2

The ten test images: (a) airplane, (b) couple, (c) flower, (d) girl, (e) monarch, (f) pen, (g) pepper, (h) soccer, (i) test, and (j) yacht and corresponding histograms: (a′) airplane, (b′) couple, (c′) flower, (d′) girl, (e′) monarch, (f′) pen, (g′) pepper, (h′) soccer, (i′) test, and (j′) yacht.