Innovations in lighting enhance the normally low contrast between the marked data cells and the marking surface. Unlike labels, which can be removed, destroyed in the manufacturing process or damaged through product use, direct marking is a permanent symbol that is integral to the part or product. In addition, marking directly on item surfaces eliminates the high cost of special purpose labels. Stacked codes are essentially narrow rows of linear codes stacked one on another. Matrix codes are uniformly sized data cells placed on a square field.
Matrix codes can be more densely packed with data than stacked codes.
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