![]() ![]() ![]() Although a barcode may appear to have no noticeable flaws to the human eye, subtle inconsistencies in the code, substrate, or even the positioning of the code in relation to the reader may result in no-reads. For seemingly high-quality codes, it is a common misconception that no-read results are due to obscure or undetectable barcode characteristics that the reader is simply unable to address, causing frustration for operators whose intention is to maximize the efficiency of an automated barcode reading process. However, the root cause of unreadable barcodes is often one of a handful of common problems that can easily be solved with simple adjustments to either the barcode or the technology used to decode it.įigure 1: To the human eye, this Data Matrix symbol may appear to be flawless. However, this symbol does not meet barcode quality requirements for some industries and may be unreadable by certain barcode readers. Understanding the primary reasons for decoding failures can save operators valuable time and effort when diagnosing reading issues. It also allows businesses to safeguard their processes and profitability by equipping their operations with the optimal tools and conditions for preventing data loss and process failures further down the line. The most common causes of unreadable barcodes are low contrast, quiet zone violations, improper reading position, print or mark inconsistency, and damage or distortion. In order to extract data from the elements (1D bars or 2D cells) of a barcode, a barcode reader must be able to differentiate between the light and dark elements of the symbol. Both element types are essential for proper decoding, enabling a barcode reader to obtain the precise patterns of barcode elements that represent encoded data in the symbol. Depending on the method used to apply a barcode (whether printed by ink or marked by abrading a material’s surface in the case of direct part marks), as well as what kind of material is used, light or dark elements may alternately manifest as either the markings on a surface (the code itself), or the background (substrate material) onto which the marks are applied. ![]()
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