Portable barcode scanners are available in two main categories. 2D and 1D. Sales of 2D barcode scanners are growing at an impressive rate. 1D scanner sales are pretty flat year-over-year. The question many potential buyers of 2D barcode scanners ask is “what are the main advantages of using a 2D barcode scanner over a 1D barcode scanner?” This article discusses just a few of the many benefits. There are some disadvantages that need to be considered when making a decision.
Advantages
The most important advantage of using a 2D barcode scanner is the ability to read and decode 2D barcodes. Data Matrix, Aztec, QR Code, and Han Xin are examples of 2D barcodes in use today. 2D barcodes are capable of storing much more data than 1D barcodes in the same or less physical space. Product manufacturers can put hundreds or even thousands of characters in a single 2D barcode.
Having the ability to read barcodes omnidirectionally is another great advantage of using a 2D barcode scanner. All handheld 2D barcode readers use an image sensor to capture an image of the barcode. That image is then run through a software decoder program that resides in the scanner’s firmware. The software decoder program has the ability to locate the barcode based on the unique characteristics of each barcode, regardless of the barcode’s orientation. This system allows the user to hold the scanner in the same position for each barcode scan regardless of the barcode position. The scanner does not have to be oriented to align with the barcode being read. User fatigue and overall read times are greatly reduced.
The image sensor uses the same technology as today’s digital cameras. The only major difference is that 2D barcode scanners use a grayscale imager instead of a color imager. Because it is an imager, many scanners have the ability to take a picture and send it to the computer it is connected to. Taking photos of signatures as proof of delivery, damaged packages, form recognition, and off-scanner image processing are just some of the applications used with 2D barcode scanner images.
Reliability is another big advantage of 2D barcode readers. There is only one moving part in a 2D barcode scanner. The trigger switch. All scanners use activation switches rated for millions of activations. There will rarely be a failure in the field. No failure means no downtime for customers, which translates to higher efficiency, less frustration, and lower total cost of ownership.
These are just some of the advantages of using a 2D barcode scanner over a 1D barcode scanner. There are more advantages that are not listed here. There are also some disadvantages. Usually, the pros outweigh the cons, but the cons should be considered when making a decision.
Disadvantages
Price. 2D barcode scanners are a fairly new and continually evolving technology. Image sensors are being tuned and improved with more pixels, faster decoding algorithms, improved lighting, and aiming patterns. Due to all these investments in technology, the price of 2D barcode readers is higher than that of 1D barcode readers. But that price gap is narrowing fast. All scanners are nearing the price point where they are considered a commodity.
The working range of 2D barcode readers is a second drawback. The working range is defined as the furthest point from the scanner at which a barcode can be read minus the closest point at which a barcode can be read. For example: a UPC-A barcode can be read from a distance of 10 inches from the scanner. That same barcode can be read as close as 2 inches from the scanner. 10 inches minus 2 inches equals 8 inches of working range. 1D barcode scanners can read that same barcode at a far distance of 18 inches and a close distance of 1 inch. That smaller working range can be a problem in some applications.