CN107111737A - Dual-camera scanning gun and scanning method thereof - Google Patents

Abstract

The invention provides a double-camera scanning gun and a double-camera scanning gun scanning method. The method comprises the following steps: acquiring a first bar code image through a near-focus camera, and acquiring a second bar code image through a far-focus camera; and decoding the first bar code image and/or the second bar code image. The bar code image is obtained through the near-focus camera and the far-focus camera with different depths of field, and the bar code image is decoded, so that the application range of the scanning gun is expanded, the time for manually adjusting the scanning gun is reduced, the code scanning time of the scanning gun is reduced, and the code scanning sensitivity is improved.

Description

Dual-camera scanning gun and scanning method thereof

technical field

The invention relates to the technical field of barcode scanning, in particular to a dual-camera scanning gun and a scanning method thereof.

Background technique

In order to expand the payment function of the cash register system such as POS machines and cash register computers, a barcode scanning gun is connected to the cash register system terminal to scan and decode barcodes to realize fast code scanning payment. Existing barcode scanning guns all use a camera to scan codes, and a camera only has a fixed depth of field range. According to the needs of customers, install a camera with a suitable depth of field. Usually the depth of field of the camera ranges from 3 to 100mm, or 50 to 100mm, which limits the scope of use of a single scanner.

The Chinese invention patent with the publication number CN103861275A discloses an improved scanning device design. A scanning device has multiple cameras. The error of one or more previous scanning devices is smaller. Although multiple cameras are set in one scanning device, to synthesize an image, the depth of field of multiple cameras must be the same, and the scope of application is also limited.

The Chinese invention patent with the publication number CN105657290A discloses a scanning method and device based on dual cameras. The method is: obtain the first image scanned by the first camera on the first area of the target object, and obtain the second camera at the same time. The second image scanned in the second area of the target shooting object, the first camera and the second camera are set on the same terminal; the first image and the second image are spliced to obtain the The image information of the entire area of the target shooting object is described; the image obtained by the splicing is displayed, and different areas of the shooting object are scanned at the same time through the dual cameras, thereby reducing the scanning exposure time. This patent also uses dual cameras to obtain the first image and the second image, and finally stitches the two images together, so the depth of field of the first camera and the second camera should also be consistent, and the scope of application is also limited.

Contents of the invention

The technical problem to be solved by the present invention is: to provide a dual-camera scanning gun and its scanning method, through which the depth of field range of the scanning gun can be expanded, so that the application range of the scanning gun can be wider, and at the same time, the time for manual adjustment of the scanning gun can be reduced. Shorten the scanning time and improve the sensitivity of the scanning gun.

In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:

A dual-camera scanning gun includes a casing, and also includes a near-focus camera and a far-focus camera. The casing is provided with a scanning window, and the near-focus camera and the far-focus camera are installed at the scanning window.

The beneficial effect of the present invention is that: the close-focus camera and the far-focus camera have different depth-of-field ranges, and the integration of the two into one scanning gun expands the range of use of the scanning gun, and at the same time shortens the time for manual adjustment of the scanning gun, that is, shortens The scanning time in the manual use of the scanning gun improves the sensitivity of the scanning gun.

A dual-camera scanning gun scanning method, the method is:

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Decoding the first barcode image and/or the second barcode image.

The beneficial effect of the present invention is that: the near-focus camera and the far-focus camera acquire the barcode images to be scanned at the same time, which are the first barcode image and the second barcode image respectively, and the depth of field of the near-focus camera and the far-focus camera are different, so that the scanning gun can be used The scanning distance of the scanning gun is larger, and the range of the scanning gun is expanded. The scanning gun acquires two barcode images at the same time, which improves the scanning success rate of the scanning gun, and at the same time reduces the time of manual adjustment of the scanning gun distance and reduces the scanning time; One or both of the barcode image and the second barcode image are decoded, and the data processing is flexible.

Description of drawings

FIG. 1 is a schematic structural view of a dual-camera scanning gun according to an embodiment of the present invention;

FIG. 2 is a flowchart of a scanning method for a dual-camera scanning gun according to Embodiment 3 of the present invention;

FIG. 3 is a flowchart of a scanning method for a dual-camera scanning gun according to Embodiment 4 of the present invention.

Label description:

1. Shell; 2. Close-focus camera; 3. Far-focus camera; 4. Fill light; 5. Laser positioning light; 6. Scan button;

11. Scanning window; 12. Handle.

detailed description

The most critical idea of the present invention is to install a near-focus camera and a far-focus camera with different depths of field on a scanning gun to expand the range of the scanning gun and reduce manual scanning time.

The dual-camera scanning gun in the present invention can be fixed or mobile, and can be used independently, or connected with cash register host, POS machine, computer host and other equipment to scan barcodes on various cards or labels, and is suitable for commodity Management or industrial production lines and other occasions.

Please refer to Fig. 1, the present invention provides a kind of dual-camera scanning gun, comprises housing 1, also comprises near-focus camera 2 and far-focus camera 3, described housing 1 is provided with scanning window 11, described near-focus camera 2 and The far-focus cameras 3 are all installed at the scanning window 11 .

Further, the near-focus camera 2 and the far-focus camera 3 are horizontally arranged side by side.

It can be seen from the above description that the close-focus camera 2 and the far-focus camera 3 are arranged horizontally side by side, so that the two cameras of the scanning gun aim at the same orientation of the barcode to be scanned, so that it is convenient to quickly align the two cameras with the barcode to be scanned at the same time, shortening the manual adjustment Time to scan the gun.

Further, a supplementary light 4 is also included, and the supplementary light 4 is installed at the scanning window 11 of the housing 1 .

It can be known from the above description that the supplementary light 4 is also installed at the scanning window 11 to play the role of supplementary light, so that the near-focus camera 2 and the far-focus camera 3 can obtain clear barcode images.

Further, the fill light 4 is installed at the edge of the scanning window 11 of the housing 1 .

It can be seen from the above description that the supplementary light 4 is installed at the edge of the scanning window 11, preferably, the supplementary light 4 is installed at the left and right edges of the near-focus camera 2 and the far-focus camera 3 of the scanning window 11, and is distributed symmetrically , so that the light within the shooting range of the near-focus camera 2 and the far-focus camera 3 is relatively sufficient and uniform.

Further, a laser positioning light 5 is also included, and the laser positioning light 5 is installed at the scanning window 11 of the housing 1 .

It can be seen from the above description that a laser positioning light 5 is also installed at the scanning window 11 to locate the barcode, which is convenient for manual quick and accurate identification of whether the scanning gun is aligned with the barcode.

Further, the laser positioning lamp 5 is installed between the near-focus camera 2 and the far-focus camera 3 .

It can be seen from the above description that the laser positioning light 5 plays the role of positioning indication, which is convenient for indicating whether the near-focus camera 2 and the far-focus camera 3 can capture the barcode. The laser positioning light 5 is installed on the near-focus camera 2 and the far-focus camera 3 In between, the positioning of the laser positioning lamp 5 on the near-focus camera 2 and the far-focus camera 3 is relatively symmetrical.

Further, the laser positioning lamp 5 is installed on the outer side of the close-focus camera 2 or the outer side of the far-focus camera 3 .

As can be seen from the above description, the laser positioning lamp 5 is installed on the outer edge of the near-focus camera 2 or the outer edge of the far-focus camera 3, so that the distance between the near-focus camera 2 and the far-focus camera 3 is closer, so that the distance between the two cameras The shooting overlap width is large.

Further, the laser positioning lamp 5 is a high-brightness infrared focusing LED lamp, which has the advantage of high brightness.

Further, a light grid is also included, and the light grid is installed in front of the laser positioning lamp 5 .

From the above description, it can be seen that if there is no light grid, the laser positioning lamp 5 will produce a bright dot. Adding a light grid can change the shape of the bright light produced by the laser positioning lamp 5, such as a grid shape, a line shape, etc., so that the laser positioning light 5 can indicate the width range of the barcode, making the scanning gun more convenient to use.

Further, a buzzer is also included, and the buzzer is installed in the casing 1 .

It can be seen from the above description that the buzzer is installed in the housing 1 and is used to issue voice prompts for the use of the scanning gun.

Further, a scanning button 6 is also included, and the scanning button 6 is installed on the casing 1 .

It can be seen from the above description that the scanning button 6 is used to trigger scanning and decoding actions. When in use, manually press the scanning button 6 so that the scanning gun can adopt a power-saving mode when it is not scanning codes.

Further, the housing 1 is provided with a handle part 12 , and the scanning button 6 is mounted on a side of the handle part 12 .

It can be seen from the above description that the scanning button 6 is installed on the handle portion 12 of the casing 1. When in use, the human hand holds the handle portion 12 of the scanning gun, which makes the hand feel good and the operation is accurate and convenient.

Further, the scan button 6 is arranged on the same side of the casing 1 as the near-focus camera 2 and the far-focus camera 3 .

As can be seen from the above description, the scan button 6 is arranged on the same side of the housing 1 as the near-focus camera 2 and the far-focus camera 3. During use, the palm of the hand holds the side of the handle 12 that is not provided with the scan button 6, and the fingers are positioned on the handle. 12 is provided with the side of the scanning button 6, preferably, the scanning button 6, the near-focus camera 2 and the far-focus camera 3 are all located on the front side of the scanning gun, which is convenient to use and conforms to people's usage habits.

Further, the near-focus camera 2 is a CMOS near-focus camera 2 , and the far-focus camera 3 is a CMOS far-focus camera 3 .

It can be known from the above description that both the close-focus camera 2 and the far-focus camera 3 are CMOS cameras, which have the advantages of convenient batch processing, low cost, and low power consumption.

Further, the depth of field of the close-focus camera 2 ranges from 20 to 400 mm.

It can be seen from the above description that the depth of field of the close-focus camera 2 ranges from 20 mm to 400 mm, and can obtain clear barcode images of barcodes within a relatively short distance from the scanning window 11 of the scanning gun.

Further, the depth of field of the telephoto camera 3 ranges from 200mm to 1000mm.

It can be seen from the above description that the depth of field of the far-focus camera 3 ranges from 200 to 1000 mm, and can obtain clear barcode images of barcodes within a relatively long distance from the scanning window 11 of the scanning gun.

Further, it also includes a processor, the near-focus camera 2 and the far-focus camera 3 are both connected to the processor, and adopt a dual MIPI hardware interface or a dual CSI hardware interface.

As can be seen from the above description, one processor is provided with two MIPI hardware interfaces or two CSI hardware interfaces, so that one processor can be connected to two cameras at the same time, and one processor can simultaneously use the near focus camera 2 and the far focus camera 2. The focal camera 3 collects images.

Further, it also includes a decoding board, the decoding board is installed in the shell 1, and the near-focus camera 2 and the far-focus camera 3 are connected to the decoding board, and the decoding board can be applied to an Android system or a Linux system, or can be It is an MPU without an operating system, and the decoding board can support the near-focus camera 2 and the far-focus camera 3 to collect image information at the same time.

Further, the scanning gun is connected to the host computer of the peripheral device through USB/UART.

Please refer to Fig. 1, embodiment one of the present invention is:

A dual-camera scanning gun, including a housing 1, also includes a near-focus camera 2 and a far-focus camera 3, the housing 1 is provided with a scanning window 11, and the near-focus camera 2 and the far-focus camera 3 are installed on the At the scanning window 11, the near-focus camera 2 and the far-focus camera 3 are horizontally arranged side by side. It is convenient to align the near-focus camera 2 and the far-focus camera 3 at the barcode to be scanned at the same time.

Please refer to Fig. 1, embodiment two of the present invention is:

A dual-camera scanning gun, on the basis of Embodiment 1, further includes a supplementary light 4, a laser positioning light 5, a light grid, a buzzer, and a scanning button 6, and the supplementary light 4 is installed on the housing 1 at the scanning window 11; preferably, the supplementary light 4 is symmetrically installed at the left and right edges of the scanning window 11 of the housing 1; the laser positioning lamp 5 is installed at the scanning window 11 of the housing 1 place; the laser positioning light 5 is installed between the near-focus camera 2 and the far-focus camera 3, or the laser positioning light 5 is installed on the outer side of the near-focus camera 2 or the outer side of the far-focus camera 3, The laser positioning lamp 5 is a high-brightness infrared focusing LED lamp, and the light grid is installed in front of the laser positioning lamp 5; the buzzer is installed in the shell 1; the scanning button 6 is installed in the On the shell 1; the shell 1 is provided with a handle portion 12, and the scan button 6 is installed on the side of the handle portion 12; the scan button 6 is arranged with the near-focus camera 2 and the far-focus camera 3 On the same side of the housing 1. It is convenient to quickly scan the code when using the scanner manually, and obtain a clear barcode image.

Please refer to Figure 2, a dual-camera scanning gun scanning method, the method is:

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Decoding the first barcode image and/or the second barcode image.

Further, please refer to Figure 2, a dual-camera scanning gun scanning method, the method is:

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Simultaneously decode the first barcode image and the second barcode image in a dual-thread manner;

After one barcode image in the first barcode image and the second barcode image is successfully decoded, a cancel decoding command is sent to the thread where the other barcode image is located to cancel the decoding of the other barcode image.

It can be seen from the above description that after the first barcode image and the second barcode image are acquired at the same time, the acquired first barcode image and the second barcode image are simultaneously decoded in a dual-threaded manner. If one of the two barcode images is After a successful decoding, the decoding of the other barcode image is immediately canceled, which greatly improves the overall sensitivity of the scanner, reduces the overall decoding time of the scanner, and improves the success rate of decoding.

Further, please refer to Figure 3, a dual-camera scanning gun scanning method, the method is:

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Select one of the first barcode image and the second barcode image to decode;

If the decoding is unsuccessful, another one of the first barcode image and the second barcode image is selected for decoding.

It can be seen from the above description that after the first barcode image and the second barcode image are acquired at the same time, one of the first barcode image and the second barcode image is decoded when decoding. If the decoding is successful, the code scanning ends. If the decoding is unsuccessful, Then select another barcode image for decoding. During use, the range of the barcode from the scanner gun is either suitable for a close-focus camera or a far-focus camera. Both images are acquired at the same time and decoded, which can greatly improve the scanning gun Scanning sensitivity and decoding success rate.

Further, in the process of decoding the first barcode image and/or the second barcode image, it also includes:

Default decoding maximum time;

Record the actual time to decode the first barcode image;

If the actual time for decoding the first barcode image is greater than the maximum decoding time, the decoding of the first barcode image is unsuccessful;

and / or,

Record the actual time of decoding the second barcode image;

If the actual time for decoding the second barcode image is greater than the maximum decoding time, the decoding of the second barcode image is unsuccessful.

It can be seen from the above description that in the process of decoding the first barcode image, if the actual decoding time is greater than the preset maximum decoding time, the decoding of the first barcode image is unsuccessful; If a barcode image is decoded successfully, the actual decoding time will not be greater than the preset maximum decoding time; similarly, in the process of decoding the second barcode image, if the actual decoding time is greater than the preset maximum decoding time, the The decoding of the second barcode image is unsuccessful, and the decoding process is measured by the preset maximum decoding time. If the decoding is unsuccessful, it is convenient for the processor to deal with it in time to prevent the scanning gun from being affected by the long time spent on decoding. Normal use.

Further, one of the first barcode image and the second barcode image is selected for decoding, specifically:

After obtaining the first barcode image and the second barcode image, calculate the exposure value of the first barcode image and the exposure value of the second barcode image;

comparing the exposure value of the first barcode image with the exposure value of the second barcode image;

Select the one with better exposure value from the first barcode image and the second barcode image for decoding.

It can be seen from the above description that the first barcode image and the second barcode image are selected for decoding according to the exposure value, and the barcode image with a better exposure value in the first barcode image and the second barcode image is decoded first, that is, the brighter barcode image is first decoded. The barcode image is decoded, which is convenient for fast and accurate decoding.

Further, if both the first barcode image and the second barcode image are decoded unsuccessfully, increase or decrease the exposure value for acquiring the first barcode image and the second barcode image.

From the above description, it can be seen that if both the first barcode image and the second barcode image are unsuccessfully decoded, the exposure value should be adjusted in time to make the brightness of the first barcode image and the second barcode image reasonable, and the decoding success rate can be improved by self-adjusting the exposure value .

Further, before acquiring the first barcode image through the near-focus camera and acquiring the second barcode image through the far-focus camera, it also includes:

Turn on the fill light on the scanner gun.

It can be seen from the above description that before acquiring the first barcode image and the second barcode image, turn on the supplementary light on the scanning gun to play the role of supplementary light, so as to facilitate the acquisition of clear first barcode image and second barcode image.

Further, before acquiring the first barcode image through the near-focus camera and acquiring the second barcode image through the far-focus camera, it also includes:

Turn on the laser positioning light on the scanner, and aim the laser positioning light at the center area of the barcode.

It can be seen from the above description that before acquiring the first barcode image and the second barcode image, turn on the laser positioning light on the scanning gun, so as to facilitate the matching of the shooting width of the first barcode image and the second barcode image with the captured barcode, and realize fast Accurately locate barcodes.

Further, before acquiring the first barcode image through the near-focus camera and acquiring the second barcode image through the far-focus camera, it also includes:

Press the scan button on the scanner.

From the above description, it can be known that the action of acquiring the first barcode image and the second barcode image is triggered by pressing the scanning button on the scanning gun manually or by machine, so that the scanning gun can turn on the power saving mode when it is not in use, which has a power saving effect.

Please refer to Fig. 2, embodiment three of the present invention is:

A dual-camera scanning gun scanning method, the method is:

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Decode the first barcode image and the second barcode image, specifically:

Simultaneously decode the first barcode image and the second barcode image in a dual-thread manner;

After one barcode image in the first barcode image and the second barcode image is successfully decoded, a cancel decoding command is sent to the thread where the other barcode image is located, and the decoding of the other barcode image is cancelled.

Please refer to Fig. 3, the fourth embodiment of the present invention is:

A dual-camera scanning gun scanning method, the method is:

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Decoding the first barcode image or the second barcode image is specifically: selecting one of the first barcode image and the second barcode image to decode;

If the decoding is unsuccessful, another one of the first barcode image and the second barcode image is selected for decoding.

Please refer to Fig. 3, embodiment five of the present invention is:

A dual-camera scanning gun scanning method, on the basis of Embodiment 3 or 4, in the process of decoding the first barcode image and/or the second barcode image, further includes:

Default decoding maximum time;

Record the actual time to decode the first barcode image;

If the actual time for decoding the first barcode image is greater than the maximum decoding time, the decoding of the first barcode image is unsuccessful;

and / or,

Record the actual time of decoding the second barcode image;

If the actual time for decoding the second barcode image is greater than the maximum decoding time, the decoding of the second barcode image is unsuccessful.

Please refer to Fig. 2 and Fig. 3, embodiment six of the present invention is:

A dual-camera scanning gun scanning method, on the basis of Embodiment 4,

Select one of the first barcode image and the second barcode image to decode, specifically:

After obtaining the first barcode image and the second barcode image, calculate the exposure value of the first barcode image and the exposure value of the second barcode image;

comparing the exposure value of the first barcode image with the exposure value of the second barcode image;

Selecting the one with a better exposure value in the first barcode image and the second barcode image for decoding;

If the decoding is unsuccessful, select another one of the first barcode image and the second barcode image to decode;

If both the first barcode image and the second barcode image are unsuccessfully decoded, the exposure value for acquiring the first barcode image and the second barcode image is increased or decreased.

Please refer to Fig. 2 and Fig. 3, embodiment seven of the present invention is:

A dual-camera scanning gun scanning method, specifically exemplifying the method:

Turn on the fill light on the scanner;

Turn on the laser positioning light on the scanner, and align the laser positioning light with the center area of the barcode;

Press the scan button on the scanner;

Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time;

Decoding the first barcode image and the second barcode image simultaneously in a dual-thread manner, or decoding only one of the first barcode image and the second barcode image;

If the decoding is successful, the buzzer will sound a successful decoding sound;

During the process of decoding the first barcode image and/or the second barcode image, the longest decoding time is preset;

If the actual decoding time for the first barcode image and/or the second barcode image is greater than the maximum decoding time, it indicates that the decoding of the corresponding barcode image fails;

If both the first barcode image and the second barcode image are decoded unsuccessfully, increase or decrease the exposure value for acquiring the first barcode image and the second barcode image, and acquire the first barcode image and the second barcode image simultaneously again for decoding again.

To sum up, in the dual-camera scanning gun and scanning method thereof provided by the present invention, a near-focus camera 2 and a far-focus camera 3 are simultaneously installed at the scanning window 11 of a scanning gun, and the near-focus camera 2 and the far-focus camera 3 are simultaneously Obtain the barcode image of the scanned barcode, fill in the light through the fill light 4, facilitate fast and accurate positioning through the laser positioning light 5, facilitate the triggering of the scanning action through the scanning button 6, and simultaneously scan the first barcode image and the second through the dual thread method The barcode image is decoded, or the first barcode image and the second barcode image are selected according to the pros and cons of the exposure value, so that the distance range of the barcode that can be scanned by a scanning gun is wider, reducing the time for manual adjustment of the scanning gun and shortening the single time. Scan code time, improve the success rate of code scanning, and improve the sensitivity of the scanning gun.

Claims (25)

1. A dual-camera scanning gun, comprising a housing, is characterized in that it also includes a near-focus camera and a far-focus camera, the housing is provided with a scanning window, and the near-focus camera and the far-focus camera are installed on the scanning window. 2. The dual-camera scanning gun according to claim 1, wherein the near-focus camera and the far-focus camera are horizontally arranged side by side. 3. The dual-camera scanning gun according to claim 1, further comprising a supplementary light installed at the scanning window of the casing. 4. The dual-camera scanning gun according to claim 3, wherein the fill light is installed at the edge of the scanning window of the casing. 5. The dual-camera scanning gun according to claim 1, further comprising a laser positioning light, the laser positioning light is installed at the scanning window of the housing. 6. The dual-camera scanning gun according to claim 5, wherein the laser positioning light is installed between the near-focus camera and the far-focus camera. 7. The dual-camera scanning gun according to claim 5, wherein the laser positioning light is installed on the outer side of the near-focus camera or the outer side of the far-focus camera. 8. The dual-camera scanning gun according to claim 5, further comprising a light grid installed in front of the laser positioning light. 9. The dual-camera scanning gun according to claim 1, further comprising a buzzer installed in the casing. 10. The dual-camera scanning gun according to claim 1, further comprising a scanning button installed on the casing. 11. The dual-camera scanning gun according to claim 10, wherein a handle is provided on the housing, and the scanning button is mounted on a side of the handle. 12. The dual-camera scanning gun according to claim 11, wherein the scanning button is arranged on the same side of the housing as the near-focus camera and the far-focus camera. 13. The dual-camera scanning gun according to claim 1, wherein the near-focus camera is a CMOS near-focus camera, and the far-focus camera is a CMOS far-focus camera. 14. The dual-camera scanning gun according to claim 1, wherein the depth of field of the close-focus camera is 20-400 mm. 15. The dual-camera scanning gun according to claim 1 or 14, wherein the depth of field of the telephoto camera is 200-1000 mm. 16. The dual-camera scanning gun according to claim 1, further comprising a processor, the near-focus camera and the far-focus camera are both connected to the processor, and adopt a dual MIPI hardware interface or adopt The way of dual CSI hardware interface. 17. A dual-camera scanning gun scanning method, characterized in that, the method is: Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time; Decoding the first barcode image and/or the second barcode image. 18. The dual-camera scanning gun scanning method according to claim 17, wherein the method is: Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time; Simultaneously decode the first barcode image and the second barcode image in a dual-thread manner; After one barcode image in the first barcode image and the second barcode image is successfully decoded, a cancel decoding command is sent to the thread where the other barcode image is located to cancel the decoding of the other barcode image. 19. The dual-camera scanning gun scanning method according to claim 17, wherein the method is: Obtain the first barcode image through the near-focus camera, and obtain the second barcode image through the far-focus camera at the same time; Select one of the first barcode image and the second barcode image to decode; If the decoding is unsuccessful, another one of the first barcode image and the second barcode image is selected for decoding. 20. The dual-camera scanning gun scanning method according to claim 17, characterized in that, in the process of decoding the first barcode image and/or the second barcode image, further comprising: Default decoding maximum time; Record the actual time to decode the first barcode image; If the actual time for decoding the first barcode image is greater than the maximum decoding time, the decoding of the first barcode image is unsuccessful; and / or, Record the actual time of decoding the second barcode image; If the actual time for decoding the second barcode image is greater than the maximum decoding time, the decoding of the second barcode image is unsuccessful. 21. The dual-camera scanning gun scanning method according to claim 19, wherein one of the first barcode image and the second barcode image is selected for decoding, specifically: After obtaining the first barcode image and the second barcode image, calculate the exposure value of the first barcode image and the exposure value of the second barcode image; comparing the exposure value of the first barcode image with the exposure value of the second barcode image; Select the one with better exposure value from the first barcode image and the second barcode image for decoding. 22. The dual-camera scanning gun scanning method according to claim 21, further comprising: If both the first barcode image and the second barcode image are unsuccessfully decoded, the exposure value for acquiring the first barcode image and the second barcode image is increased or decreased. 23. The dual-camera scanning gun scanning method according to claim 17, characterized in that, before acquiring the first barcode image through the near-focus camera and acquiring the second barcode image through the far-focus camera, it also includes: Turn on the fill light on the scanner gun. 24. The dual-camera scanning gun scanning method according to claim 17, characterized in that, before acquiring the first barcode image through the near-focus camera and acquiring the second barcode image through the far-focus camera, it also includes: Turn on the laser positioning light on the scanner, and aim the laser positioning light at the center area of the barcode. 25. The dual-camera scanning gun scanning method according to claim 17, characterized in that, before acquiring the first barcode image through the near-focus camera and acquiring the second barcode image through the far-focus camera, it also includes: Press the scan button on the scanner.