A
system and related techniques provide a platform for encoding
high density geometric symbol sets, for example a triangular
barcode-type of encoding which may be used to
encode drivers' licenses, biometric IDs, passports, or other transaction or identification media. According to embodiments of the invention in one regard, an inkjet,
laser or other printer or
output device may imprint a paper, plastic or other media with geometric symbols such as triangles in a defined array, to represent, for instance, name, address, or other identifying information, for instance such as digital facial photographs, iris or
retinal scans, fingerprints, signatures, or other information. The geometric symbols may in one regard be arranged in a staggered format, separated in embodiments by a white space that may serve to reduce
aliasing effects and other distortions. Because triangular symbols may in general be packed more closely together, and the number of distinct individual symbols may scale according to the range of
color space employed for the symbol set, information densities high enough to satisfactorily
encode biometric iris or
retinal scans, digital facial photographs, or other identification or other information may be achieved. In embodiments,
error correcting processing such as Reed-Solomon techniques may be employed to enhance scanning accuracy. In further embodiments, a reference palette may be embedded within the imprinted media, to provide a scale against which color
fading or other
distortion may be measured.