15 details to note when using barcode scanners

Introduction: What do we need to pay attention to when using barcode scanners? There are 15 details that you must be aware of when using a barcode scanner. The editors below will answer your questions.

01 Cannot Disassemble the Barcode Scanner

Barcode scanners are sophisticated devices that require internal optoelectronic converters to convert analog signals into digital signals before they are sent to computers. The position requirement of each optical component in this photoelectric conversion setup is very high. If we dismantle the scanner without authorization, the positions of these optical components will inadvertently be changed, which will affect the scanning imaging work of the scanner. Therefore, when everyone encounters a problem with the scanner, do not tamper with it. Be sure to send it to the manufacturer or the designated repair station. When transporting the scanner, be sure to lock the safety lock on the back of the scanner to avoid changing the optics. The location of the accessories, while trying to avoid the scanner vibration or tilt.

02 Protecting the Barcode Scanner's Optical Imaging Unit

Optical imaging components are an important part of the bar code scanner. It is also normal for a long time for the optical components to be covered with dust. However, if the scanner is used for a long time without paying attention to maintenance, the dust on the optical components will be More and more, this will greatly reduce the scanner's working performance, such as the reflective lens, the dust on the lens will seriously reduce the image quality, there are spots or weaken the image contrast. In addition, during use, it is unavoidable that the hand touches the glass plate and leaves a fingerprint on the plate. These fingerprints also weaken the reflected light, which affects the scanning quality of the picture. So we should clean it regularly. When cleaning, you can first wipe the dust off the casing with a soft muslin and then carefully clean it with detergent and water. Then we clean the glass plate again. Because the panel is clean or not, it directly affects the scanning quality of the image. Therefore, when cleaning the panel, we must first wipe it with a glass cleaner and then use a soft dry cloth to dry it. Wipe clean. After use, be sure to use a dust cover to cover the bar code scanner to prevent more dust from attacking.

03 correctly install the barcode scanner

Bar code scanners are not as easy to install as ordinary computer peripherals, depending on the interface, the scanner installation method is not the same. If the scanner's interface is of USB type, you should first check whether the USB device is working properly in the computer's "System Properties" dialog box, then install the scanner driver, then restart the computer, and use the USB connection. After the scanner is connected, the computer will automatically detect the new hardware. Everyone can follow the on-screen instructions to complete the rest of the operations. If the scanner is a parallel port type, you must first enter the BIOS setup before installing. In the I/O Device configuration option, change the parallel port mode to EPP. Then connect the barcode scanner and install the driver.

04 Eliminating Barcode Scanner Noise

After a long period of work, barcode scanners may experience some noise during work. If the noise is too loud, everyone should disassemble the machine cover and find some oil droplets of the sewing machine to wipe grease on the two orbits of the mirror group on the toilet paper. Put the sewing machine oil on the bearings of the transmission gear set and both ends of the belt (pay attention to the moderate amount of oil), and finally adjust the elasticity of the belt properly.

05 correctly placed the scanning object of the barcode scanner

In the actual use of images, we sometimes want to be able to tilt images with oblique effects. Many of our designers often use a scanner to input images into a computer and then use professional image software to rotate them. In order to make the image achieve the effect of rotation, everyone knows that this process is a waste of time. According to the size of the rotation, the quality of the image will decline. If we know in advance how the image is placed on the page, then using the protractor and the bottom edge of the original to place the original on the roller and platform at a precise angle yields the highest quality image, not necessarily in the image processing software. Make another rotation.

06 Select the right barcode scanner resolution

When many users use barcode scanners, they often have questions about how much resolution to scan. In fact, this has to be decided by the user's actual application requirements. Since the highest resolution of the barcode scanner is obtained by interpolation operation, scanning with an accuracy exceeding the optical resolution of the scanner does not significantly improve the output effect and consumes a great deal of computer resources. If the purpose of the scan is to view it on the monitor, the scan resolution is set to 100; if it is scanned for printing, a resolution of 300 can be used, and if the work is to be printed by scanning, at least 300 dpi or more must be used. The resolution, of course, is better if 600dpi can be used.

07 Barcode Scanner It is better to perform pre-scan before scanning

Many users skip the prescan steps to save scan time when scanning large-size photos or documents. In fact, before the official scan, the pre-scan function is very necessary, it is the first level to ensure the scanning effect. There are two advantages of pre-scanning. First, we can directly determine the areas that we need to trace through the pre-scanned images to reduce the processing of images after scanning. Second, we can observe the pre-scanned images. , we can generally see the color, effect, etc. of the image. If not satisfied, we can scan the parameters again to set, adjust and then scan.

08 Select the appropriate barcode scanner scan type

Choosing the right type of scan will not only help increase the scanner's recognition success rate, but it will also produce a file of the correct size. Usually the scanner can provide the user with photo, grayscale and black and white scan types. Everyone must choose the right scan type according to the different scan objects before scanning. The "Photo" scan type is suitable for scanning color photographs. It requires multiple levels of red, green, and blue channels to be sampled and stored. This method produces a larger size file; the "grayscale" scan type is often used for both The pictures also have mixed text and graphic text. The type of scanning includes both text and pictures with multiple gray levels. The size of the files is moderate. The “black and white” scanning type is common in black and white original scanning. When this type of scanning is used, The scanner will represent both black and white pixels according to 1 bit, and the file size generated by this method is the smallest.

09 Correctly scan documents

Many people now use barcode scanners to input documents in order to avoid the inconvenience of entering Chinese characters. To ensure that the scanner has a high recognition rate, everyone should ensure that the scanned manuscript is clear, and other conditions are the same. The recognition rate of printed drafts, printed drafts, etc. can reach 95% or more; however, for articles that are not clear, such as copies and newspapers, the recognition rate of most OCR software is not too high. When a user needs to scan a document with a large thickness, direct scanning may inevitably result in the incompleteness and distortion of the text due to the fact that the text cannot be fully spread out. The result is that the OCR software cannot correctly identify the document and greatly reduces the result. Recognition rate. Therefore, before scanning, it is best to split the manuscript into a single page and then scan it. For ordinary newspapers, since it is a single document, it does not have the above problems. However, because the size of newspapers is usually large and cannot be scanned at one time, pre-scanning scans the area in advance and scans one area at a time. Will greatly improve.

10 adjust the brightness and contrast

In order to achieve a higher image scanning effect, everyone should learn to adjust the brightness and contrast. For example, when the brightness of the grayscale and color images is too bright or too dark, you can change the brightness by dragging the slider on the brightness slider. If the brightness is too high, the image will look white; if the brightness is too low, it will be too dark. You should make the brightness of the image moderate when you drag the brightness slider. The same for other parameters, we can follow the same adjustment method to make local modifications until your visual effects are satisfied.

11 bar code scanner can smartly scan film

We all know that using ordinary bar code scanners can not scan transparencies, it must be done with a scanner with a translucent adapter, but scanners with this feature are relatively expensive. So can we scan the film with an ordinary scanner? The answer is of course yes, but we need to modify the ordinary scanner. First of all, we have to turn off the light source inside the ordinary scanner (this step is more difficult to operate, do not try easily if the electronic level is not high), and then add a light source on the back of the film to be scanned. When scanning, cover the rest of the scanner platform with black paper to prevent exposure. As for the new light source, the most common fluorescent light can be used. The position of the light source should not be too close to the bar code scanner, preferably about 8 cm.

12 Correct the scanning color

In order to achieve a higher fidelity for color-rich color images, we should correct the number of scan color bits before the scanner. When correcting, first select the nominal color number of the barcode scanner, scan a predetermined color photo, and set the display's display mode to true color. Compare it with the original to see if the color is full and there is no color cast. It should be noted that the situation that is completely consistent with the original is not present, and the monitor may produce color shifts that may affect the observation. The scanner's photosensitive system will also produce a certain color cast. Most high- and mid-range scanners have color correction software, but only a few low-end scanners have color correction software. Please perform color calibration on the monitor and scanner before testing.

13 computer output file size

When everyone scans a photo, the scanner will generate an image file on the hard disk. The size of the hard disk space occupied by this file is directly related to the size and complexity of the scanned photos and the resolution set when you scan, so we should set the file size when scanning. Usually, the scanner can automatically calculate the file size when previewing the original manuscript, but knowing how to calculate the file size helps you to make appropriate choices when managing scanned files and determining the scanning resolution. The calculation formula of the binary image file is: horizontal size × vertical size × (scanning resolution) 2/8. The calculation formula for the color image file is: horizontal size × vertical size × (scanning resolution) 2×3.

14 use transparent film accessories

Many users find that the scanner comes with a transparent film accessory after they are bought back. What exactly does this accessory do? Many users are very upset. In fact, the accessory is used with flatbed scanners to scan transparent films. To get the best scanning of a transparency or slide, remove the picture from the shelf and slide mount and mount it on a glass scan bed with the reverse side down (usually the matte side). Cut out the mask with black paper and cover the entire scan bed except where the manuscript is set. This will reduce glare and excessive exposure during scanning.

15 Looking for the ideal scanning position for barcode scanners

Usually when we place the scan draft, we always place it along the edge of the scan plate. In fact, the edge of the scan plate is not the best scan area. What is the best scan area on the scan plate? This optimal scanning position is determined after multiple tests and search. The specific search method is: first set all the controls of the barcode scanner to automatic or silent state, select all areas, and then scan at low resolution. A blank, white or opaque block sample; then open the sample using professional image processing software Photoshop, use the software average command (Equalize menu item) to process the sample, after processing we can see Where are the cracks, streaks, black spots on the scanner? We can print this file and cut out the best area (that is, the most stable area) to help us place the image.