Fig. 4From: Design of image barcodes for future mobile advertisingIllustration of the dot profile function, which is unique for the clustered-dot screening. a The traditional 8 ×8 45° clustered-dot screen. b Shadow dot profile patterns corresponding to a. c Highlight dot profile patterns corresponding to a. The increasing order of size in b and c corresponds to the spatial arrangement of thresholds in a Back to article page