CN114780172A - External camera identification method and device, intelligent display screen and storage medium - Google Patents

External camera identification method and device, intelligent display screen and storage medium Download PDF

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Publication number
CN114780172A
CN114780172A CN202210394016.XA CN202210394016A CN114780172A CN 114780172 A CN114780172 A CN 114780172A CN 202210394016 A CN202210394016 A CN 202210394016A CN 114780172 A CN114780172 A CN 114780172A
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external
field
equipment
camera
external camera
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CN114780172B (en
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玉宁
陈悦清
邵国光
江滔
肖龙
王梓
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Umeox Innovations Co ltd
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/44—Arrangements for executing specific programs
    • G06F9/445—Program loading or initiating
    • G06F9/44521—Dynamic linking or loading; Link editing at or after load time, e.g. Java class loading
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F13/00—Interconnection of, or transfer of information or other signals between, memories, input/output devices or central processing units
    • G06F13/38—Information transfer, e.g. on bus
    • G06F13/40—Bus structure
    • G06F13/4063—Device-to-bus coupling
    • G06F13/4068—Electrical coupling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/22—Matching criteria, e.g. proximity measures
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F18/00—Pattern recognition
    • G06F18/20—Analysing
    • G06F18/24—Classification techniques
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
    • G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
    • G06F3/048—Interaction techniques based on graphical user interfaces [GUI]
    • G06F3/0481—Interaction techniques based on graphical user interfaces [GUI] based on specific properties of the displayed interaction object or a metaphor-based environment, e.g. interaction with desktop elements like windows or icons, or assisted by a cursor's changing behaviour or appearance
    • G06F3/0482—Interaction with lists of selectable items, e.g. menus
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F9/00—Arrangements for program control, e.g. control units
    • G06F9/06—Arrangements for program control, e.g. control units using stored programs, i.e. using an internal store of processing equipment to receive or retain programs
    • G06F9/46—Multiprogramming arrangements
    • G06F9/48—Program initiating; Program switching, e.g. by interrupt
    • G06F9/4806—Task transfer initiation or dispatching
    • G06F9/4843—Task transfer initiation or dispatching by program, e.g. task dispatcher, supervisor, operating system
    • G06F9/4881—Scheduling strategies for dispatcher, e.g. round robin, multi-level priority queues
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L69/00—Network arrangements, protocols or services independent of the application payload and not provided for in the other groups of this subclass
    • H04L69/26—Special purpose or proprietary protocols or architectures

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Abstract

The embodiment of the invention provides an identification method and device of an external camera, an intelligent display screen and a storage medium, wherein when a USB interface is detected to be connected into external equipment, the class code information of the external equipment is acquired; identifying a base class field and a subclass field corresponding to the class code information; and when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera. The method comprises the steps of acquiring class code information of the external equipment when a USB interface is detected to be connected into the external equipment, judging that the equipment type of the external equipment is an external camera when field information in the class code information meets preset conditions, ensuring that a user can accurately identify the camera when the user externally connects the camera on the terminal, avoiding the phenomenon that the user mistakenly sends prompt information due to the fact that the terminal cannot identify the camera, and improving product use experience of the user.

Description

External camera identification method and device, intelligent display screen and storage medium
Technical Field
The invention relates to the technical field of computers, in particular to an external camera identification method and device, an intelligent display screen and a readable storage medium.
Background
At present, the android terminal devices commonly available in the market can execute actions such as photographing, video recording and face recognition through an external camera.
However, an API (Application Programming Interface) of an SDK (Software Development Kit) of the android system may not recognize a camera device at the Interface, so that the android terminal device cannot use an external camera.
The above is only for the purpose of assisting understanding of the technical solution of the present invention, and does not represent an admission that the above is the prior art.
Disclosure of Invention
The invention mainly aims to provide a display control method of augmented reality glasses, and aims to solve the problem that an android terminal device cannot use an external camera.
In order to achieve the above object, a display control method for augmented reality glasses according to the present invention includes:
when detecting that a USB interface is connected to external equipment, acquiring class code information of the external equipment;
identifying a base class field and a subclass field corresponding to the class code information;
and when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera.
Optionally, the step of acquiring the class code information of the external device when it is detected that the USB interface is connected to the external device includes:
when detecting that the USB interface is connected to the external equipment, calling an equipment description instruction;
analyzing the hardware information of the external equipment according to the equipment description instruction;
and determining the category code information corresponding to the hardware information.
Optionally, after the obtaining of the category code information of the external device, the method includes:
identifying a protocol field in the category code information;
and loading a driver corresponding to the equipment type of the external equipment according to the protocol field.
Optionally, when the base class field and the subclass field satisfy a first preset condition, the step of determining that the device type of the external device is an external camera includes:
matching the base class field with a preset base class field set to obtain a target base class field;
determining a preset subclass field set corresponding to the target base class field;
matching the subclass field with the preset subclass field set to obtain a target subclass field;
and when the target base class field is a first target base class field and the target subclass field is a first target subclass field, judging that the first preset condition is met, and determining that the equipment type of the external equipment is the external camera.
Optionally, after the step of determining that the device type of the external device is the external camera when the base class field and the subclass field satisfy a first preset condition, the method includes:
acquiring the equipment category of the external equipment of each USB interface;
detecting the number of the external devices with the same device type;
and when the equipment category of the external equipment is the cameras and the number of the cameras is more than one, generating a camera selection list.
Optionally, before the step of obtaining the category code information of the external device, the method includes:
acquiring a voltage value of each USB interface;
judging whether the USB interface is connected to the external equipment or not according to the voltage value, wherein when a voltage difference occurs at the USB interface, the USB interface is judged to be connected to the external equipment; otherwise, the access is not carried out.
Optionally, after the step of determining that the device type of the external device is the external camera when the base class field and the subclass field satisfy a first preset condition, the method further includes:
according to the time sequence of accessing the USB interface, marking the external equipment with the same equipment type;
determining the priority of the external equipment according to the sequence of the marks;
and calling a driving program of the external equipment according to the priority.
In addition, in order to achieve the above object, the present invention further provides an identification apparatus externally connected to a camera, including:
the access detection module is used for detecting whether the USB interface is accessed to the external equipment or not;
and the identification module is used for identifying the equipment category of the external equipment.
In addition, in order to achieve the above object, the present invention further provides an intelligent display screen, including: the external camera identification method comprises a memory, a processor and an external camera identification program which is stored on the memory and can run on the processor, wherein when the external camera identification program is executed by the processor, each step of the external camera identification method is realized
In addition, to achieve the above object, the present invention further provides a computer-readable storage medium, in which an identification program of an external camera is stored, and the identification program of the external camera, when executed by a processor, implements the steps of the identification method of the external camera according to the above embodiment.
The embodiment of the invention provides an identification method and device of an external camera, an intelligent display screen and a storage medium, wherein when a USB interface is detected to be connected into an external device, the class code information of the external device is obtained; identifying a base class field and a subclass field corresponding to the class code information; and when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera. The method comprises the steps of acquiring class code information of the external device when a USB interface is detected to be connected into the external device, judging when field information in the class code information meets preset conditions, wherein the type of the external device is an external camera mode, so that a camera can be accurately identified by a terminal when a user externally connects the camera to the terminal, the phenomenon that prompt information is mistakenly sent due to the fact that the terminal cannot identify the camera is avoided, and product use experience of the user is improved.
Drawings
Fig. 1 is a schematic diagram of a hardware architecture of an identification apparatus externally connected to a camera according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a first embodiment of an identification method of an external camera according to the present invention;
fig. 3 is a schematic flowchart illustrating a second embodiment of an identification method for an external camera according to the present invention;
fig. 4 is a schematic flow chart of a third embodiment of the identification method of the external camera according to the present invention;
fig. 5 is a schematic diagram of a camera selection list according to an embodiment of the present invention;
fig. 6 is a schematic flow chart of a fourth embodiment of the identification method of the external camera according to the present invention;
fig. 7 is a schematic diagram of an architecture of an external camera recognition device according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It is to be understood that the appended drawings illustrate exemplary embodiments of the invention, which may be embodied in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
As an implementation scheme, the identification device externally connected to the camera may be as shown in fig. 1.
The embodiment of the invention relates to an identification device of an external camera, which comprises: a processor 101, e.g. a CPU, a memory 102, a communication bus 103. Wherein the communication bus 103 is used for enabling the connection communication between these components.
The memory 102 may be a high-speed RAM memory or a non-volatile memory (e.g., a disk memory). As shown in fig. 1, a memory 102, which is a computer-readable storage medium, may include therein an identification program for an external camera; the processor 101 may be configured to call the external camera recognition program stored in the memory 102, and perform the following operations:
when detecting that a USB interface is connected to external equipment, acquiring class code information of the external equipment;
identifying a base class field and a subclass field corresponding to the class code information;
and when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera.
In one embodiment, the processor 101 may be configured to call the external camera recognition program stored in the memory 102, and perform the following operations:
when detecting that the USB interface is accessed into the external equipment, calling an equipment description instruction;
analyzing the hardware information of the external equipment according to the equipment description instruction;
and determining the category code information corresponding to the hardware information.
In one embodiment, the processor 101 may be configured to call the external camera recognition program stored in the memory 102, and perform the following operations:
identifying a protocol field in the category code information;
and loading a driver corresponding to the equipment type of the external equipment according to the protocol field.
In an embodiment, the processor 101 may be configured to call an external camera recognition program stored in the memory 102, and perform the following operations:
acquiring the equipment category of the external equipment of each USB interface;
detecting the number of the external devices of the same device type;
and when the equipment category of the external equipment is the camera and the number of the cameras is more than one, generating a camera selection list.
In an embodiment, the processor 101 may be configured to call an external camera recognition program stored in the memory 102, and perform the following operations:
according to the time sequence of accessing the USB interface, marking the external equipment with the same equipment type;
determining the priority of the external equipment according to the sequence of the marks;
and calling a driving program of the external equipment according to the priority.
Based on the hardware architecture of the external camera identification device based on the computer technology, the embodiment of the external camera identification method is provided.
The TV APP can appear opening the condition of failure when external camera, probably direct suggestion: please insert a camera or the like, however, the user actually inserts an external camera at the USB interface, which may be a situation that the television cannot identify the accessed camera due to factors such as application and authority, and the like, thereby reducing user experience, and even causing user complaints and the like. The invention provides accurate prompt and operation for users by reading the information of the USB interface hardware equipment.
Referring to fig. 2, in a first embodiment, the method for identifying an external camera includes the following steps:
step S10, when detecting that the USB interface is accessed to the external equipment, acquiring the class code information of the external equipment;
in this embodiment, first, when it is detected that the USB interface is connected to the external device, corresponding class code information in the external device is obtained, where the class code information is used to identify the device and load a device driver, and the class code information includes a base class field, a subclass field, and a protocol field.
Optionally, the mode of detecting the USB interface external device may be to determine whether a device is inserted at the interface by detecting a voltage change at the USB interface; optionally, in another embodiment, whether a device is inserted into the interface may be determined by detecting a level transition of the signal line.
Optionally, the category code information of the external device is obtained by calling a device description instruction, where the device description instruction is an instruction preset in the terminal of this embodiment and used for analyzing hardware information of the external device, and the hardware information is used for describing information of a device manufacturer, a product, and a device serial number, and the category code information corresponding to the external device in the terminal is identified according to the information.
Step S20, identifying a base class field and a subclass field corresponding to the class code information;
further, a base class field and a subclass field corresponding to the class code information are identified, according to the fields, a terminal (such as an intelligent display) corresponding to the USB interface can analyze and obtain the base class field set and the subclass field set corresponding to the external device in a preset field set, the base class field is a device-level definition field used for identifying communication devices containing several different types of interfaces, and the subclass field defines a general mechanism which can be used for enabling all types of communication services on the USB bus, namely, the control function of the USB communication device.
Step S30, when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera;
further, in order to determine whether the external device is a camera, a field judgment condition is preset, and when the obtained field information meets the preset judgment condition, the device type corresponding to the field information is judged to be the external camera.
Optionally, matching the obtained base class field with a preset base class field set to obtain a target base class field of the base class field in the field set, then determining a subclass field set corresponding to the base class field according to the target base class field, and then putting the obtained subclass field into the subclass field set for matching to obtain a target subclass field of the subclass field in the field set. When the target base class field is a first target base class field and the target subclass field is a first target subclass field, judging that the obtained base class field and the obtained subclass field meet preset judgment conditions, and judging that the external equipment corresponding to the field information is an external camera.
Exemplarily, in a specific embodiment, when the field value of the base class is 0xEF and the field of the subclass is equal to 2, it is determined that the first preset condition is satisfied, and the external device is a camera; otherwise it is not a camera.
In the technical scheme provided by the embodiment, when the USB interface is detected to be connected into the external device, the class code information of the external device is acquired, when the field information in the class code information meets the preset condition, the type of the external device is judged to be the mode of the external camera, when the user externally connects the external camera on the terminal, the camera can be accurately identified by the terminal, the phenomenon that the prompt information is mistakenly sent due to the fact that the terminal cannot identify the camera is avoided, and product use experience of the user is improved.
Referring to fig. 3, in the second embodiment, based on the first embodiment, after the step S10, the method further includes:
step S40, identifying the protocol field in the category code information;
and step S50, loading a driver corresponding to the device type of the external device according to the protocol field.
Optionally, the class code information further includes a protocol field, and the protocol field is used as a data interface, and is generally used for communication connection between the external device and the accessed terminal, that is, it is ensured that the external device can implement data transmission to the accessed terminal through the USB interface. In this embodiment, a communication connection is established between the external device and the accessed terminal according to the protocol field, and a driver pre-stored in a memory of the external device is downloaded on the terminal, wherein the driver is a program code for communicating the computer and the external device. The driver program performs interactive operation of data and instructions with the peripheral equipment by reading and writing the external register of the peripheral equipment. For example, after the camera is accessed, the data in the external register belonging to the camera changes, and the system or the application program can know the actions executed by the camera after reading the data, and then further process the actions according to the program setting, so that the user can directly control the external device on the terminal, such as a series of actions of opening and closing.
In the technical scheme provided by this embodiment, by identifying the protocol field in the category code information and loading the driver corresponding to the device type of the external device according to the protocol field, the user can directly control the external device on the terminal. The problem that the external device cannot be started due to related problems such as permission and the like is avoided, and product use experience of a user is improved.
Referring to fig. 4, in the third embodiment, based on any one of the embodiments, after the step S30, the method further includes:
step S60, acquiring the device type of the external device of each USB interface;
step S70, detecting the number of the external devices with the same device type;
and step S80, when the equipment type of the external equipment is the camera and the number of the cameras is more than one, generating a camera selection list.
Optionally, the present embodiment provides a selection manner when the user inserts two or more external cameras into the USB interface of the terminal. In this embodiment, the device type of the external device may be obtained by analyzing hardware information of each piece of plug-in device, and when the device type is a camera and the number of cameras is more than one, a camera selection list is generated, so that a user selects a camera to be used according to the camera selection list. Illustratively, referring to fig. 5, fig. 5 is a schematic diagram of a camera selection list in an intelligent display as a terminal, and a user may select at least one camera name (e.g., camera 1 and/or camera 2 in the schematic diagram) in the list. It should be emphasized that, when a user selects multiple cameras to be used together, the terminal may select cameras with different priorities to be used according to the sequence of accessing the external device, so as to avoid application conflicts among external devices of the same type.
In the technical scheme provided by the embodiment, when a plurality of external camera devices are inserted, a camera selection list for a user to select is generated, so that the problem that the device cannot be started correctly due to conflict when the terminal is accessed into the plurality of external devices of the same type is avoided, and the product use experience of the user is improved.
Referring to fig. 6, in the fourth embodiment, after the step S30, according to any one of the embodiments, the method further includes:
step S90, according to the time sequence of accessing the USB interface, the external devices with the same device type are marked;
step S100, determining the priority of the external equipment according to the sequence of the marks;
and step S110, calling a driving program of the external equipment according to the priority.
Optionally, this implementation provides a selection manner of device access priority. In this embodiment, the external devices with the same device type are marked according to the time sequence of accessing the USB interface, and the call priority of the driver of the external device is determined according to the marked sequence. For example, the device that first accesses a USB interface is labeled XX device 1, another like device that next plugs into another USB interface is labeled XX device 2, and so on. Since the driver calling priority of the XX device 1 is higher than that of the XX device 2, this means that the terminal does not call the driver corresponding to the XX device 2 to interrupt the operation of the XX device 1 in the operation process of the XX device 1. It should be emphasized that the priority set in this embodiment does not cause two devices of the same category to be unable to operate simultaneously, and a user may start a mode of operating multiple devices simultaneously in the terminal as needed, for example, a front camera and a rear camera need to be installed on a display serving as the terminal, and then the two cameras may operate simultaneously in the mode, and a conflict may not occur between the devices due to the difference in priority.
In the technical scheme provided by the embodiment, the calling priority of the driver of the external device is determined based on the insertion time sequence of the external device, so that the phenomenon that the external device which is accessed later interrupts the operation of the external device which is accessed first is avoided, and the product use experience of a user is improved.
In addition, referring to fig. 7, this embodiment further provides an external camera recognition device, where the external camera recognition device includes:
an access detection module 100, configured to detect whether the USB interface is accessed to an external device;
and the identification module 200 is configured to identify the device type of the external device.
In addition, the identification device of the external camera can also execute the following steps:
when detecting that a USB interface is connected to external equipment, acquiring class code information of the external equipment;
identifying a base class field and a subclass field corresponding to the class code information;
and when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera.
In addition, the identification device of the external camera can also execute the following steps:
when detecting that the USB interface is accessed into the external equipment, calling an equipment description instruction;
analyzing the hardware information of the external equipment according to the equipment description instruction;
and determining the category code information corresponding to the hardware information.
In addition, the identification device of the external camera can also execute the following steps:
identifying a protocol field in the category code information;
and loading a driver corresponding to the equipment type of the external equipment according to the protocol field.
In addition, the identification device of the external camera can also execute the following steps:
matching the base class field with a preset base class field set to obtain a target base class field;
determining a preset subclass field set corresponding to the target base class field;
matching the subclass field with the preset subclass field set to obtain a target subclass field;
and when the target base class field is a first target base class field and the target subclass field is a first target subclass field, judging that the first preset condition is met, and determining that the equipment type of the external equipment is the external camera.
In addition, the identification device of the external camera can also execute the following steps:
acquiring the equipment category of the external equipment of each USB interface;
detecting the number of the external devices of the same device type;
and when the equipment category of the external equipment is the cameras and the number of the cameras is more than one, generating a camera selection list.
In addition, the identification device of the external camera can also execute the following steps:
acquiring a voltage value of each USB interface;
judging whether the USB interface is connected to the external equipment or not according to the voltage value, wherein when a voltage difference occurs at the USB interface, the USB interface is judged to be connected to the external equipment; otherwise, the access is not carried out.
In addition, the identification device of the external camera can also execute the following steps:
according to the time sequence of accessing the USB interface, marking the external equipment with the same equipment type;
determining the priority of the external equipment according to the sequence of the marks;
and calling a driving program of the external equipment according to the priority.
In addition, the present invention also provides an intelligent display screen, which includes: the external camera identification method comprises a memory, a processor and an external camera identification program which is stored on the memory and can run on the processor, wherein when the external camera identification program is executed by the processor, each step of the external camera identification method is realized.
In addition, the present invention further provides a computer-readable storage medium, where an identification program of an external camera is stored, and when the identification program of the external camera is executed by a processor, the steps of the identification method of the external camera according to the above embodiments are implemented.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element identified by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention or portions thereof contributing to the prior art may be embodied in the form of a software product, which is stored in a computer readable storage medium (such as ROM/RAM, magnetic disk, optical disk) as described above and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.

Claims (10)

1. An identification method of an external camera is characterized in that the identification method of the external camera comprises the following steps:
when detecting that a USB interface is accessed into external equipment, acquiring class code information of the external equipment;
identifying a base class field and a subclass field corresponding to the class code information;
and when the base class field and the subclass field meet a first preset condition, judging that the equipment type of the external equipment is an external camera.
2. The method for identifying an external camera according to claim 1, wherein the step of acquiring the class code information of the external device when detecting that the USB interface is connected to the external device comprises:
when detecting that the USB interface is connected to the external equipment, calling an equipment description instruction;
analyzing the hardware information of the external equipment according to the equipment description instruction;
and determining the category code information corresponding to the hardware information.
3. The method for identifying an external camera according to claim 2, wherein after the obtaining of the class code information of the external device, the method comprises:
identifying a protocol field in the category code information;
and loading a driver corresponding to the equipment type of the external equipment according to the protocol field.
4. The method for identifying the external camera according to claim 3, wherein the step of determining that the device type of the external device is the external camera when the base class field and the subclass field satisfy a first preset condition comprises:
matching the base class field with a preset base class field set to obtain a target base class field;
determining a preset subclass field set corresponding to the target base class field;
matching the subclass field with the preset subclass field set to obtain a target subclass field;
and when the target base class field is a first target base class field and the target subclass field is a first target subclass field, judging that the first preset condition is met, and determining that the equipment type of the external equipment is the external camera.
5. The method for identifying an external camera according to claim 4, wherein after the step of determining that the device type of the external device is the external camera when the base class field and the subclass field satisfy a first preset condition, the method comprises:
acquiring the equipment category of the external equipment of each USB interface;
detecting the number of the external devices with the same device type;
and when the equipment category of the external equipment is the camera and the number of the cameras is more than one, generating a camera selection list.
6. The method for identifying an external camera according to claim 5, wherein the step of obtaining the class code information of the external device is preceded by:
acquiring a voltage value of each USB interface;
judging whether the USB interface is connected to the external equipment or not according to the voltage value, wherein when a voltage difference occurs at the USB interface, the USB interface is judged to be connected to the external equipment; otherwise, the access is not carried out.
7. The method for identifying an external camera according to claim 1, wherein after the step of determining that the device type of the external device is the external camera when the base class field and the subclass field satisfy a first preset condition, the method further comprises:
according to the time sequence of accessing the USB interface, marking the external equipment with the same equipment type;
determining the priority of the external equipment according to the sequence of the marks;
and calling a driving program of the external equipment according to the priority.
8. The utility model provides an identification device of external camera which characterized in that, identification device of external camera includes:
the access detection module is used for detecting whether the USB interface is accessed to the external equipment or not;
and the identification module is used for identifying the equipment category of the external equipment.
9. The utility model provides an intelligent display screen, its characterized in that, intelligent display screen includes: the external camera identification method comprises a memory, a processor and an external camera identification program which is stored on the memory and can run on the processor, wherein when the external camera identification program is executed by the processor, the steps of the external camera identification method according to any one of claims 1-7 are realized.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores thereon an external camera identification program, and when the external camera identification program is executed by a processor, the steps of the external camera identification method according to any one of claims 1 to 7 are implemented.
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