Unlike conventional feature-based algorithms, which start by locating the finder pattern, the new technology looks for a pattern of alternating light and dark modules within the code. It can locate and read codes even when they is significant damage to – or complete elimination of – the finder pattern, clocking pattern, or quiet zone.
“Cognex is constantly seeking opportunities to improve our decoding algorithms,” says Carl Gerst, the company’s senior vice-president for ID Products. “After analysing images of codes that we couldn’t read, we determined that a high percentage showed significant finder pattern, clocking pattern, or quiet zone damage. Our engineers came up with a completely new and innovative technique that can find and read these codes without relying on the finder pattern. The result is nothing short of incredible.”
The PowerGrid technology is now available on the X models of Cognex’s DataMan 300 fixed-mount barcode readers.