Decoding multi-resolution optical codes

摘要

A method of decoding a machine-readable optical code that includes a first code including a plurality of first elements formed on or in a substrate, the first code specifying first information, wherein one or more of the first elements includes a second code on or in the substrate, the second code including a plurality of second elements specifying second information; and wherein the first code and the second code are machine-readable optical codes, the method comprising: using a first image reader to record the first code, the first code specifying first information to form a first recorded image; using a processor to decode the first information from the first recorded image; using a second image reader to record the second code to form a second recorded image; and using the processor to decode the second information from the second recorded image whereby the machine-readable optical code is decoded.

主权项

1. A method of decoding machine-readable optical codes, the method comprising:
using a first image reader to record a first code specifying first information to form a first recorded image, the first code including a plurality of first elements each having pixel values formed on or in a substrate, wherein two or more adjacent and contiguous first elements make up a single second code on or in the substrate, the single second code including a plurality of second elements specifying second information, and wherein the first code and the single second code are machine-readable optical codes; averaging the pixel values of each first element; selecting a binary dark or light state for each of the first elements using the corresponding average pixel value; using a processor to decode the first information from the first recorded image using the selected dark or light state for each of the first elements; using a second image reader to record the single second code to form a second recorded image; and using the processor to decode the second information from the second recorded image whereby the machine-readable optical code is decoded.