Generation of faultless multi-pinhole masks by means of spatial filtering

Faultless multi-pinhole masks are generated by a spatial filtering process using very simple intensity filters. In particular, in the case of hexagonal multi-pinhole masks, filters with only one hexagonal ring of pinholes are used yielding two interesting features of the filtered images: the depth of focus of the images is increased to centimeters, and the number of holes within the masks can very easily be increased by a factor 4 or 9.