# Patent

## Title
Backlit display detection and radio signature recognition

## Abstract

A method of capturing an image of a barcode from a backlit display device includes monitoring radio signals proximal to a device operable for scanning barcodes, with at least one coil, wire, and/or antenna disposed within the device operable for scanning barcodes; detecting radio interference caused by a backlit display device proximal to the device operable for scanning barcodes; interpreting a pattern of the radio interference to determine one or more technical characteristics of the backlit display device; using the determined technical characteristics of the backlit display device for automatically adjusting scanning settings of the device operable for scanning barcodes; and capturing an image of a barcode displayed on the backlit display device.

## Background
FIELD OF THE INVENTION
The present invention relates to computer-readable codes, such as barcodes, and more particularly to a method of detecting the presence of a backlit display device, with further radio signature recognition in application to scanning codes from an electronic display or screen.
BACKGROUND
Generally speaking, prior art methods of barcode scanning similar to the type described herein, suffer from various shortcomings and drawbacks. In particular, modern automatic barcode scanning devices configured for scanning electronically displayed barcodes lack intelligence capabilities necessary adjust scanning parameters. For example, some devices determine the presence of electronic devices by monitoring changes in surrounding magnetic field. While this approach may allow for automatic enablement of an electronic barcode scanning mode, it does not allow for dynamic adjustment of scanning parameters based on the type of the device displaying the barcode.
For example, in U.S. Pat. No. 9,016,582 issued to Panday et al., the barcode reading terminal consists of magnetic sensors that detect the presence of electronically displayed code. At the same time, no further adjustment is made to improve the speed and quality of the scanning process, in response to the particular properties of the electronic device.
Therefore, a need exists for a quick and reliable method of determining technical characteristics of an electronic device where a computer-readable code is electronically displayed, when the code is presented before a code-reading terminal of a barcode scanner prior to image capture. By detecting such characteristics, an optimal mode of operation of the code-reading terminal of the barcode scanner can be dynamically selected for an improved performance of image capture.
SUMMARY
Accordingly, in one aspect, the present invention embraces a method of detecting the presence of a backlit display device, with further radio signature recognition in application to scanning codes from an electronic display.
In an exemplary embodiment, a method of capturing an image of a barcode from a backlit display device focuses on monitoring and measuring proximal radio signals with a barcode scanner, detecting radio interference produced by the backlit display device, interpreting a signal pattern of the detected radio interference, and correlating the pattern to technical characteristics of the backlit display device. The determined characteristics are then used for automatically selecting scanning settings of the barcode scanner, and capturing the detected displayed image with the barcode scanner.
In another exemplary embodiment, a method of communicating information displayed on a mobile device focuses on applying the acquired information pertaining to the type of the mobile device (based on emitted radio signals determined with an interfacing device having a code-reading terminal) to adjusting scanning parameters for capturing an image of the computer-readable code displayed on a display of the mobile device.
In yet another exemplary embodiment, a method of scanning a barcode from a digital device focuses on monitoring radio signals proximal to a device operable for scanning barcodes, with at least one coil, wire, and/or antenna disposed within the device operable for scanning barcodes, and coupling and amplifying detected radio interference signals, followed by adjusting one or more scanning parameters based on a pattern of the interference; and capturing an image of a barcode displayed on the digital device.
The foregoing illustrative summary, as well as other exemplary objectives and/or advantages of the invention, and the manner in which the same are accomplished, are further explained within the following detailed description and its accompanying drawings.



BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 depicts a flow chart of a method of capturing an image of a barcode from a backlit display device, according to an embodiment.
FIG. 2 depicts a flow chart of a method of communicating information displayed on a mobile device, according to an embodiment.
FIG. 3 depicts a flow chart of a method of scanning a barcode from a digital device, according to an embodiment.



DETAILED DESCRIPTION
Electronic devices produce radio signals of a particular pattern, which can be used to imply a presence of an electronically displayed code, in contrast with printed codes, which do not normally emit radio signals. The change in the radio signals detected by a device operable for scanning barcodes can be used to detect presence of a proximate electronic device and thus, presence of a proximate electronically displayed code. The information about the presence of the electronically displayed code can then be used to prompt enabling of an electronically displayed code reading mode of operation. Configuring the device operable for scanning barcodes to detect radio signals in particular, and not any magnetic field in general, can, among other features, improve the quality of detection of electronic devices by not relying barely on the presence of ferrous materials, as in case with magnetic sensors often used in prior art.
Additionally, such a configuration can allow for retrieving information pertaining to a type of the electronic device, and the corresponding technical characteristics of the display. Such information can be matched with particular scanning settings optimal for the device, thus improving the speed and overall quality of the scanning process. In particular, display screens (also referred to as “displays” herein), and especially emissive screens, such as backlit displays, are known to exhibit compatibility issues with barcode scanners. For example, emissive screens can have a diffusing front coating or surface treatment of the glass, which may cause significant light scattering when illuminated with a barcode scanner, thus reducing the image contrast. Consequently, automatically accounting for these and other issues induced by the varying screen properties of an electronic device when a barcode is presented, can improve the quality of the scanning results.
The present invention embraces a method of detecting the presence of a backlit display device, with further radio signature recognition in application to scanning computer-readable codes, such as barcodes, from a backlit display of the electronic device. According to the present invention, the detection of the presence of the backlit display device can be carried out by purposely coupling radio interference produced by such device via a coil, a wire, and/or an antenna disposed within a device operable for scanning barcodes.
FIG. 1 is a flowchart showing an exemplary embodiment of a method 100 of capturing an image of a barcode from a backlit display device. At 102, proximal radio signals are monitored and measured with a barcode scanner. At 104, radio interference produced by a backlit display device is detected with the barcode scanner. At 106, a signal pattern of the detected radio interference is interpreted and correlated to one or more technical characteristics of the backlit display device. For example, the technical characteristics can include display size, brightness, contrast, display glass type, reflective trimmings, and/or image display settings, such as placement of the code in different parts of the display depending on the type of the backlit display device. At 108, the determined technical characteristics of the backlit display device are used for automatically selecting one or more scanning settings on the barcode scanner. For example, selecting scanning settings on the barcode scanner can include adjusting exposure, illumination intensity, and/or a code-finder pattern to predetermined settings. At 110, a displayed image of a barcode is detected on the backlit display device, with the barcode scanner. At 112, the detected displayed image is captured with a capturing system disposed within the barcode scanner.
In an embodiment, detecting radio interference, 104, can include coupling radio interference with at least one coil, wire, and/or antenna disposed within the barcode scanner. Thus, the barcode scanner may be configured to react to radio signals, omitting the need to rely on magnetic properties of ferrous materials commonly used in backlit display devices.
FIG. 2 is a flowchart showing an exemplary embodiment of a method 200 of communicating information displayed on a mobile device, according to an embodiment. At 202, a type of a mobile device is determined with an interfacing device having a code-reading terminal, based on radio signals emitted by the mobile device. At 204, one or more scanning parameters are adjusted to preselected values based on the determined type of the mobile device. At 206, an image of a computer-readable code, displayed on the mobile device placed in front of the code-reading terminal of the interfacing device, is captured.
In an embodiment, the method 200 may further include collecting and storing data pertaining to the determined type of the mobile device, in a remote database. For example, such data may include make and model of the device, and corresponding technical characteristics (e.g., display size, brightness, contrast, display glass type, reflective trimmings, and/or image display settings).
In an embodiment, the method 200 may further include transmitting the obtained computer-readable code information to an information-receiving device disposed outside the interfacing device.
In an embodiment, the computer-readable code can include a barcode. The mobile device can include an emissive display, e.g. a backlit display.
FIG. 3 is a flowchart showing an exemplary embodiment of a method 300 of scanning a barcode from a digital device. At 302, radio signals proximal to a device operable for scanning barcodes are monitored with at least one coil, wire, and/or antenna disposed within the device operable for scanning barcodes. At 304, radio interference, produced by a digital device proximal to the device operable for scanning barcodes, is detected. At 306, the detected radio interference signals are coupled and amplified with the at least one coil, wire, and/or antenna. In an embodiment, the coil, wire, and/or antenna may be configured to be in a strong resonance with radio frequencies emitted by the digital device. For example, the size and/or shape of the coil or wire configurations may be set to a particular length, number of turns, etc. At 308, one or more scanning parameters are adjusted based on a pattern of the detected radio interference. At 310, an image of a barcode displayed on the digital device is captured.
In an embodiment, detecting radio interference, 304, can include detecting radio interference from a backlit display device. The backlit display device can include a mobile phone, a tablet, a palmtop computer, etc. In one embodiment, the device operable for scanning barcodes can include a handheld scanner.
Thus, it is possible to scan computer-readable codes, such as barcodes, from a variety of electronic displays. By means of coupling radio interference detected by a device operable for scanning barcodes, one or more technical characteristics of an electronic device can be determined, followed by establishing of optimal scanning conditions. Established scanning conditions may enhance the speed, reliability, overall quality and other properties of the scanning process.
Method components are meant to show only those specific details that are pertinent to understanding the embodiments of the present disclosure so as not to obscure the disclosure with details that will be readily apparent to those of ordinary skill in the art having the benefit of the description herein. In various embodiments, the sequence in which the elements appear in exemplary embodiments disclosed herein may vary, and two or more the steps may be performed simultaneously or in a different order than the sequence in which the elements appear in the exemplary embodiments. As used herein, terms “display” and “screen” shall be considered synonymous unless further definition is provided. A device or structure that is “configured” in a certain way is configured in at least that way, but may also be configured in ways that are not listed.
To supplement the present disclosure, this application incorporates entirely by reference the following commonly assigned patents, patent application publications, and patent applications:

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In the specification and/or figures, typical embodiments of the invention have been disclosed. The present invention is not limited to such exemplary embodiments. The use of the term “and/or” includes any and all combinations of one or more of the associated listed items. The figures are schematic representations and so are not necessarily drawn to scale. Unless otherwise noted, specific terms have been used in a generic and descriptive sense and not for purposes of limitation.

## Claims

1. A method of capturing an image of a barcode from a backlit display device, the method comprising:
monitoring and measuring proximal radio signals with a barcode scanner;
detecting, with the barcode scanner, radio interference produced by a backlit display device;
interpreting a signal pattern of the detected radio interference, and correlating the pattern to one or more technical characteristics of the backlit display device;
using the determined technical characteristics of the backlit display device for automatically selecting one or more scanning settings on the barcode scanner;
detecting a displayed image of a barcode on the backlit display device, with the barcode scanner; and
capturing the detected displayed image with a capturing system disposed within the barcode scanner.

2. The method according to claim 1, wherein the one or more technical characteristics of the backlit display device include display size, brightness, contrast, display glass type, reflective trimmings, and/or image display settings.

3. The method according to claim 1, wherein the selecting one or more scanning settings on the barcode scanner includes adjusting exposure, illumination intensity, and/or a code-finder pattern to predetermined settings.

4. The method according to claim 1, wherein the detecting radio interference includes coupling radio interference with at least one coil, wire, and/or antenna disposed within the barcode scanner.

5. A method of communicating information displayed on a mobile device, the method comprising:
determining, with an interfacing device having a code-reading terminal, a type of a mobile device based on emitted radio signals;
adjusting one or more scanning parameters to preselected values based on the determined type of the mobile device; and
capturing an image of a computer-readable code displayed on the mobile device placed in front of the code-reading terminal of the interfacing device.

6. The method according to claim 5, further comprising collecting and storing data pertaining to the determined type of the mobile device, in a remote database.

7. The method according to claim 5, further comprising transmitting the obtained computer-readable code information to an information receiving device disposed outside the interfacing device.

8. The method according to claim 5, wherein the mobile device includes an emissive display.

9. The method according to claim 8, wherein the emissive display comprises a backlit display.

10. The method according to claim 5, wherein the computer-readable code comprises a barcode.

11. A method of scanning a barcode from a digital device, the method comprising:
monitoring radio signals proximal to a device operable for scanning barcodes, with at least one coil, wire, and/or antenna disposed within the device operable for scanning barcodes;
detecting radio interference produced by a digital device proximal to the device operable for scanning barcodes;
coupling and amplifying the detected radio interference signals with the at least one coil, wire, and/or antenna;
adjusting one or more scanning parameters based on a pattern of the detected radio interference; and
capturing an image of a barcode displayed on the digital device.

12. The method according to claim 11, wherein the detecting radio interference includes detecting radio interference from a backlit display device.

13. The method according to claim 12, wherein the backlit display device comprises a mobile phone, a tablet, or a palmtop computer.

14. The method according to claim 12, wherein the device operable for scanning barcodes is a handheld scanner.

15. The method according to claim 11, wherein the at least one coil, wire, and/or antenna is configured to be in a strong resonance with radio frequencies emitted by the digital device.