Cognex's tech improves 2D barcode reading rate

Cognex Corp. has introduced a texture-based location algorithm that takes a unique, inside-out approach to reading 2D matrix and Direct Part Mark (DPM) codes. While conventional feature-based algorithms start by locating the finder pattern, Cognex's PowerGrid technology looks for a pattern of alternating light and dark modules within the code, indicated the company.

PowerGrid technology claims to dramatically increase read rates in 2D barcode-reading applications where a part's geometry, poor lighting, occlusion, or print-registration errors make it difficult to capture an image of the entire code. Unlike previous solutions, PowerGrid technology can locate and read codes even when they exhibit significant damage to or complete elimination of the finder pattern, clocking pattern, or quiet zone.

"Even though 2DMax software set the standard for performance in industrial ID for the most challenging 2D barcodes, Cognex is constantly seeking opportunities to improve our decoding algorithms," said Carl Gerst, SVP, ID products, Cognex. "After analysing images of codes that we couldn't read, we determined that a high per centage showed significant finder pattern, clocking pattern, or quiet zone damage."

Cognex's PowerGrid technology is available on the X models of the DataMan 300 series fixed-mount barcode readers.