There are differences between wireless and wired barcode scanners, but what are the more differences? How to choose the best barcode scanner, today let us share the considerations for choosing a barcode scanning device, starting from the resolution, scanning depth of field, scanning speed, etc., analyze one by one, hope it will be helpful for you to choose a barcode scanner device.

1. Resolution

For a barcode scanning system, the resolution is the width of the narrowest bar that can be correctly detected and read. The English name is MINIMALBARWIDTH (abbreviated as MBW). When selecting a device, it is not that the higher the splitting rate of the device, the better, but the scanner with the corresponding resolution should be selected according to the barcode density used in the specific application. In use, if the resolution of the selected device is too high, the stain and deinking on the bar will have a more serious impact on the system.

The resolution of the barcode scanner should be determined from three aspects: the optical part, the hardware part and the software part. In other words, the resolution of a barcode scanner is equal to the resolution of its optical components plus the resolution obtained by processing and analyzing itself through hardware and software.

Optical resolution is the actual number of light points that the optical components of the barcode scanner can capture per square inch. It refers to the physical resolution of the barcode scanner CCD (or other optoelectronic devices), and it is also the true resolution of the barcode scanner Rate, its value is the value obtained by dividing the pixel points that can be captured by the photoelectric element by the maximum scannable size of the barcode scanner. For example, a barcode scanner with a resolution of 1200DPI usually only accounts for 400-600DPI in the resolution of the optical part. The resolution of the extended part is jointly generated by hardware and software. This process is generated by analyzing the image through a computer and mathematically filling the blank part (this process is also called interpolation processing).

The optical scanning and output are one-to-one, and what is scanned is what the output is. After the computer software and hardware are processed, the output image will become more realistic and the resolution will be higher. Most of the barcode scanners on the market have the function of expanding the resolution of software and hardware. Some barcode scanner advertisements write 9600×9600DPI, which is only the maximum resolution obtained through software interpolation, not the true optical resolution of the barcode scanner. So for a barcode scanner, its resolution includes optical resolution (or optical resolution) and maximum resolution. Of course, what we care about is optical resolution, which is hard work.

Say that the resolution of a barcode scanner is as high as 4800DPI (this 4800DPI is the sum of optical resolution and software difference processing), which means that when the barcode scanner is used to input the image, it can collect 4800 on a 1 square inch scanning area. × 4800 pixels (Pixel). The scanning area of ​​1 inch square, the image size generated after scanning with the resolution of 4800DPI is 4800Pixel×4800Pixel. When scanning an image, the higher the scanning resolution is set, the finer the effect of the generated image, the larger the generated image file, and the more interpolation components.

2. Scan depth of field

Scanning depth of field refers to the difference between the farthest distance the scanning head can leave the barcode surface and the closest point the scanner can approach the barcode surface under the premise of ensuring reliable reading, which is the effective working range of the barcode scanner. Some barcode scanning devices do not provide scanning depth of field indicators in the technical indicators, but provide scanning distance, that is, the shortest distance that the scanning head is allowed to leave the barcode surface.

3. Scan width (SCANWIDTH)

The scan width index refers to the physical length of the barcode information that can be read by the scanning beam at a given scan distance.

4. Scanning speed (SCANSPEED)

Scanning speed refers to the scanning frequency of the scanning beam on the scanning track per unit time.

5. One-time recognition rate

One-time recognition rate means the ratio of the number of tags read in the first scan to the total number of scanned tags. For example, if the information of a barcode label needs to be scanned twice every time it is read, the recognition rate for one time is 50%. From the perspective of practical application, it is of course hoped that every scan can pass, but unfortunately, due to the influence of many factors, it is impossible to require a recognition rate of 100% at a time.

It should be noted that: the one-time recognition rate test indicator is only applicable to the handheld light pen scanning recognition method. If the laser scanning method is adopted, the scanning frequency of the light beam on the barcode label is as high as hundreds of times per second, and the signal obtained by scanning is repeated.

6. Reading error rate

Reading error rate is an extremely important test indicator that reflects the misrecognition of a machine identifiable label system. The reading error rate is equal to the ratio of the number of incorrect identifications to the total number of identifications. For a barcode system, the reading error rate is a more serious problem than a low recognition rate.