CN103559150B - The implementation method of main frame external camera and device and mobile terminal - Google Patents
The implementation method of main frame external camera and device and mobile terminal Download PDFInfo
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Abstract
The embodiment of the present invention provides the implementation method of a kind of main frame external camera and device and mobile terminal.The method includes: when host operating system monitors external camera plug, broadcast external camera plug information；Camera application program receives the broadcast of external camera plug information, by the operation interface of the hardware abstraction layer of host operating system, produces or discharges photographic head resource instances；Described camera application program, by the operation interface of the hardware abstraction layer of host operating system, the photographic head resource instances calling generation completes image processing function.External camera is realized resource instances by software by the present invention, thus the virtual built-in camera turning to this main frame, and then i.e. can realize the process function of the gathered image of this external camera.Owing to main frame can plug external camera easily, thus easy to operate, flexible, and improve without extra hardware and software, the low cost therefore realized.
Description
Technical field
The present embodiments relate to computer equipment technology, particularly relate to the realization of a kind of main frame external camera
Method and apparatus and mobile terminal.
Background technology
Scope, also known as endoscope, be a kind of multidisciplinary general instrument, and its function is can be deep to crooked pipeline
Place detects, and can be used for observing the position that can not look at straight, can observe in sealing cavity interior spatial structure with
State, can realize distant surveillance and operation.Industrial endoscope being not required to dismounting or can destroy assembling and equipment
In the case of out of service, it is achieved Non-Destructive Testing, it is widely used in aviation, automobile, boats and ships, electric, change
Each department of the modern core industry such as, electric power, coal gas, atomic energy, civil construction.
Existing endoscope is made up of with detection pipe main frame, and detection pipe is photographic head, is used for gathering image, its
After being connected to main frame, complete image preview by the device in main frame and take pictures.
Thus, prior art needs to increase related device in main frame and coordinates and realize endoscope, this results in
The defect that equipment cost improves.
Summary of the invention
The embodiment of the present invention provides the implementation method of a kind of main frame external camera and device and mobile terminal, with
Reduce main frame and realize the cost of external camera.
The embodiment of the present invention provides the implementation method of a kind of main frame external camera, including:
When host operating system monitors external camera plug, broadcast external camera plug information；
Camera application program receives the broadcast of external camera plug information, by the hardware of host operating system
The operation interface of level of abstraction, produces or discharges photographic head resource instances；
Described camera application program, by the operation interface of the hardware abstraction layer of host operating system, calls product
Raw photographic head resource instances completes image processing function, and described image processing function at least includes preview, bat
According to and/or video recording.
What the embodiment of the present invention also provided for a kind of main frame external camera realizes device, including:
Plug broadcast module, when being used for using host operating system to monitor external camera plug, outside broadcast
Put photographic head plug information；
Resource instances operation module, for using camera application program to receive the wide of external camera plug information
Broadcast, by the operation interface of the hardware abstraction layer of host operating system, produce or discharge photographic head resource instances；
Image processing module, for using the described camera application program hardware abstraction by host operating system
The operation interface of layer, the photographic head resource instances calling generation completes image processing function, described image procossing
Function at least includes preview, takes pictures and/or record a video.
The embodiment of the present invention provides again a kind of mobile terminal, and the host operating system configured is that Android operation is
System, described terminal includes that external connecting-disconnecting interface, described terminal also include what any embodiment of the present invention was provided
Main frame external camera realize device.
The technical scheme of the embodiment of the present invention, realizes resource instances by external camera by software, thus empty
Intend turning to the built-in camera of this main frame, and then i.e. can realize the process of the gathered image of this external camera
Function.Owing to main frame can plug external camera easily, thus easy to operate, flexible, and without additionally
Hardware and software improve, the low cost therefore realized.
Accompanying drawing explanation
The flow chart of the implementation method of the main frame external camera that Fig. 1 provides for the embodiment of the present invention one；
The flow chart of the implementation method of the main frame external camera that Fig. 2 provides for the embodiment of the present invention two；
The structural representation realizing device of the main frame external camera that Fig. 3 provides for the embodiment of the present invention three.
Detailed description of the invention
The present invention is described in further detail with embodiment below in conjunction with the accompanying drawings.It is understood that this
Specific embodiment described by place is used only for explaining the present invention, rather than limitation of the invention.The most also need
It is noted that for the ease of describing, accompanying drawing illustrate only part related to the present invention and not all knot
Structure.
Embodiment one
The flow chart of the implementation method of the main frame external camera that Fig. 1 provides for the embodiment of the present invention one, this reality
Execute example to be applicable on main frame connect external camera with pluggable form, carry out the situation of image procossing,
Scene particularly preferably is, on the mobile terminal that Android (Android) host operating system realizes, to plug
External camera realizes endoscope.The realization dress of the main frame external camera that the method can be realized by software
Putting and perform, this device is arranged in the mobile phone of such as mobile terminal.
The method of the present embodiment specifically includes following steps:
When step 110, host operating system monitor external camera plug, broadcast external camera plug
Information；
Step 120, camera application program receive external camera and insert the broadcast of information, pass through host service function
The operation interface of the hardware abstraction layer of system, produces photographic head resource instances；
Step 130, described camera application program, connect by the operation of the hardware abstraction layer of host operating system
Mouthful, the photographic head resource instances calling generation completes image processing function, and described image processing function at least wraps
Include preview, take pictures and/or record a video；
Step 140, extract the broadcast of information when camera application program receives external camera, grasped by main frame
Make the operation interface of the hardware abstraction layer of system, discharge photographic head resource instances.
For step 120 and 140, camera application program can recognize that the particular content of plug information, and then complete
Become to produce or the operation of release photographic head resource instances.
The technical scheme of the embodiment of the present invention, realizes resource instances by external camera by software, thus empty
Intend turning to the built-in camera of this main frame, and then i.e. can realize the process of the gathered image of this external camera
Function.Owing to main frame can plug external camera easily, thus easy to operate, flexible, and without additionally
Hardware and software improve, the low cost therefore realized.
Embodiment two
The flow chart of the implementation method of the main frame external camera that Fig. 2 provides for the embodiment of the present invention two, this reality
Execute example based on previous embodiment, provide a preferred embodiment.
In the present embodiment, the interface type belonging to external camera is USB (universal serial bus) (Universal
Serial Bus, is called for short USB), it will be understood by those skilled in the art that the interface belonging to external camera
Type can also select other protocol ports that main frame is provided that.
The host operating system of the present embodiment is as a example by Android system, and its kernel used is Linux.Android
The function of the set-up function that system possesses and interface, also can realize similar functions in other host operating systems,
It is only title difference.
Based on above-mentioned situation, the method for the present embodiment specifically includes following steps:
Step 210, the kernel of configuration host operating system support type belonging to external camera, outside supporting
Putting camera device, wherein, the type of described external camera is USB.
Above-mentioned steps is for realizing the driving layer support of external camera.This step is optional step, as this is main
Some type of external camera supported by machine itself, then without the configuration repeated.Join with Android system below
Concrete configuration means are described as a example by putting USB camera.Video4linux is to set about video in linux
Standby kernel-driven, it provides consistent DLL, in linux for the application programming of video equipment
UVC class can complete the support for USB camera, by by kernel setup file
USB_VIDEO_CLASS chooses and can generate kernel device drives for Y, thus can complete interior verification USB and take the photograph
As the driving layer of head is supported.
When host operating system in embodiment one monitors external camera plug, broadcast external camera is inserted
The operation pulling out information specifically comprises the steps that
Step 220, the kernel of host operating system monitor interior nuclear equipment hot plug event by Netlink, and
Resolve the information received by Netlink, it determines the equipment of plug；
In aforesaid operations, Netlink(network linking) it is consumer process and the kernels such as such as camera application program
The mechanism of communication is carried out between system.User space program can create AF_NETLINK protocol family, protocol type
For the plug information of equipment on the socket of NETLINK_KOBJECT_UEVENT type, i.e. acceptable system,
Plug information comprises information such as inserting the device type extracted.
Step 230, when the equipment that described host operating system determines plug is photographic head, broadcast external
Photographic head plug information；
Above-mentioned steps 220 and 230 can realize the main frame automatic switchover to photographic head.For there is built-in shooting
The problem that preferentially accessing i.e. occur in the presence of simultaneously in the main frame of head, built-in camera and external camera.With peace
As a example by the mobile terminal of tall and erect system inserts USB camera, it is achieved preferentially access in the case of inserting USB camera
USB camera, in the case of extracting USB camera, preserves relevant taking pictures and Video data, and is switched to
Built-in camera.Concrete executive means can be:
UsbService(USB service) UsbHostManager(USB host manager) be main frame behaviour
Making the power function in system, whether system of can monitoring there is USB camera hot plug event, and by sending
Android Broadcast(Android is broadcasted) notify.
In embodiment one, camera application program receives the broadcast of external camera plug information, passes through host service function
The operation interface of the hardware abstraction layer of system, produces or discharges the operation of photographic head resource instances and can be divided into insertion
Photographic head and two operating process extracting photographic head.Insert photographic head, produce the behaviour of photographic head resource instances
Specifically include as process:
Step 240, camera application program receive the broadcast of external camera plug information, pass through host service function
The mark of the hardware abstraction layer interface transmission external camera of system；
Insert as a example by USB camera by Android system, when USB camera is inserted, start camera applications journey
Sequence, prioritizing selection USB camera, if camera application program is when front stage operation, then automatically switches
It is current photographic head to USB camera.Can utilize by external camera is encapsulated as built-in camera
Existing realization mechanism realizes image procossing.
Concrete, camera application program typically can be by the hardware abstraction layer interface transmission of host operating system
Put the mark of photographic head, such as, by the open method of hw_module_methods_t structure, transmission
Photographic head ID(numerical character) open different photographic head.Set can be set and represent front-facing camera, " 0 "
Represent post-positioned pick-up head.Difference according to photographic head ID in open method, host operating system can be to not
Same photographic head carries out different initialization.When realizing external camera, i.e. with the ID generation of external camera
ID for built-in camera.Put before opening or in the case of post-positioned pick-up head, replace with external camera identification
Built-in camera identifies, to control the initialization of photographic head constructed fuction execution USB camera resource, thus
Realize USB camera is encapsulated as front-facing camera.
Step 250, described host operating system photographic head constructed fuction by travel through kernel vision hardware
Equipment Name Documents under each subdirectory in facility information catalogue, it determines whether the equipment for external camera is believed
Breath catalogue, and according to the directory name of facility information catalogue, it is thus achieved that the device node of external camera, by behaviour
Make external camera equipment and gather image；
The video drive that step 260, the photographic head constructed fuction of described host operating system are provided by kernel
Interface, calls the device drives that described external camera is corresponding, and joins according to the description of described external camera
Number and described device drives are that described external camera generates photographic head resource instances, it is achieved image processing function
Interface, completes the form conversion of the view data to external camera collection and presses in described image function interface
Contracting.
In above-mentioned steps, according to the photographic head ID of transmission, the photographic head constructed fuction of host operating system
(CameraHardwareSec) initialization of corresponding photographic head resource is carried out.Initialization includes control hardware
The unlatching of node and configuration software resource.As in step 250, set by the vision hardware of traversal kernel
Standby message catalog (device name under each subdirectory under sys/class/video4linux/video [0～n]
(name) content of storage in file, confirms whether the camera device that this device node is corresponding is " usb
camera”.Identify the title of each node i.e., successively, it is judged that whether this node is USB camera.As
Fruit is then to search corresponding device node, specifically according to the afterbody of the title of device name place subdirectory
Numeral " d ", the catalogue (/dev/videod) at device node searches corresponding device node.And then it is controlled
System opens the device node of correspondence, initializes related resource.
Configuring for software resource, in step 260, the equipment specifically calling external camera corresponding drives
Dynamic, and according to the characterising parameter of external camera, the such as parameter such as pixel, size, raw for external camera
Become photographic head resource instances, it is achieved image processing function interface.
Step 130 in embodiment one, described camera application program, taken out by the hardware of host operating system
As the operation interface of layer, call the photographic head resource instances of generation and complete the operation of image processing function and specifically wrap
Include:
Step 270, described camera application program are called by jni, access the image of photographic head resource instances
Process functional interface, according to the configuration attribute in described photographic head resource instances, use software format conversion letter
Number or hardware compression device, complete the conversion of the form to view data and compression, and realize image processing function.
Specifically, camera application program is typically realized by java applet, and hardware abstraction layer is by c/c++ program
Realize, then camera application program can pass through interface, Java this locality (Java Native Interface, JNI)
The structure camera_device_ops_t indirectly calling hardware abstraction layer operates interface, completes photographic head
Operation.By the hardware compression device on software or Android main process equipment in the image function interface of encapsulation
Complete from USB camera output format, such as YUV RGB etc., to preview take pictures video recording pattern of the input turn
Change, obtain preview take pictures video recording required view data.
Preview takes pictures that video process realizes at image processing function interface can basis in flow process
CameraHardwareSec class mCameraID attribute completes the function treatment flow process of different photographic head, such as
" 1 " represents front-facing camera, " 0 " table post-positioned pick-up head.
When step 280, described camera application program receive the broadcast that external camera extracts information, stop figure
As processing function, call the operation interface of host operating system hardware abstraction layer, discharge described photographic head resource
Example.
In above-mentioned steps, when USB camera is extracted, camera application program can start post-positioned pick-up head or
Out of service.In the case of video recording is taken pictures, it is possible to preserve recorded video in time, discharge resource, protect equipment.
The embodiment of the present invention, is the built-in shooting of Android system main process equipment by USB camera by software encapsulation
Head, can complete the scheme of endoscope's function.During realizing external camera: encapsulation USB camera
And the operation interface that offer is consistent with built-in camera, thus camera application program without differences can process USB
External camera and built-in camera.The program is by each video equipment of catalogue under traversal sys file system
Subdirectory information, it is thus achieved that the device node that USB external camera is corresponding.The program is plugged by audiomonitor
Event, can carry out photographic head automatic switchover according to photographic head plug.System passes through Netlink and kernel communication,
Acquisition equipment inserts and extracts information, sends insertion facility information information such as () VENDOR_ID and PRODUCT_ID
Broadcast, receive broadcast and filter the plug message of USB camera, notice camera application program switches over
Photographic head.
Compared with prior art, in the technical scheme that the embodiment of the present invention proposes, there is some advantage following:
1, by USB camera, by panel computer or the mobile terminal of Android system, can be real by software
The function of existing endoscope, it is not necessary to additional hardware equipment, reduces cost；
2, USB plug detection realizes with broadcast message form, automatically switches after can completing to insert photographic head；
3, external camera plug is convenient, replaces detecting lenses flexible；
4, without using fixed host computer, the function of available existing all types of main frames, such as touch screen interactive,
More more humane than traditional touch-tone operation.
Embodiment three
The structural representation realizing device of the main frame external camera that Fig. 3 provides for the embodiment of the present invention three,
This device includes: plug broadcast module 310, resource instances operation module 320 and image processing module 330.
Wherein, when plug broadcast module 310 is used for using host operating system to monitor external camera plug,
Broadcast external camera plug information；Resource instances operation module 320 is used for using camera application program to receive
The broadcast of external camera plug information, by the operation interface of the hardware abstraction layer of host operating system, produces
Life or release photographic head resource instances；Image processing module 330 is used for using described camera application program to pass through
The operation interface of the hardware abstraction layer of host operating system, the photographic head resource instances calling generation completes image
Processing function, described image processing function at least includes preview, takes pictures and/or record a video.
On the basis of such scheme, preferably:
Plug broadcast module 310 specifically for: use host operating system kernel by Netlink monitor in
Nuclear equipment hot plug event, and resolve the information received by Netlink, it determines the equipment of plug；As described master
Machine operating system determines the equipment of plug when being photographic head, broadcast external camera plug information;
Resource instances operation module 320 includes: resource instances creating unit 321 and resource instances releasing unit
322。
Described resource instances creating unit 321, is used for using camera application program to receive external camera plug
The broadcast of information, transmits the mark of external camera by the hardware abstraction layer interface of host operating system；Adopt
With the photographic head constructed fuction of described host operating system by traveling through the vision hardware facility information catalogue of kernel
In equipment Name Documents under each subdirectory, it determines whether for the facility information catalogue of external camera, and root
Directory name according to facility information catalogue, it is thus achieved that the device node of external camera, by operation external camera
Equipment gathers image；Use the video that the photographic head constructed fuction of described host operating system is provided by kernel
Drive interface, call the device drives that described external camera is corresponding, and retouching according to described external camera
State parameter and described device drives is that described external camera generates photographic head resource instances, it is achieved image procossing
Functional interface, the form completing the view data to external camera collection in described image function interface is changed
With compression.
Resource instances releasing unit 322 is used for using described camera application program to receive external camera and extracts letter
During the broadcast ceased, stop image processing function, call the operation interface of host operating system hardware abstraction layer,
Discharge described photographic head resource instances.
Image processing module 330 can be specifically for: uses described camera application program to be called by jni, accesses
The image processing function interface of photographic head resource instances, according to the configuration attribute in described photographic head resource instances,
Use software format transfer function or hardware compression device, complete the conversion of the form to view data and compression,
And realize image processing function.
Further, this device may also include that driving layer configuration module 340, is used for configuring host service function system
The kernel of system supports type belonging to external camera, to support external camera equipment, wherein, described external
The type of photographic head is USB (universal serial bus).
The embodiment of the present invention provide main frame external camera realize device can be used for perform the present invention arbitrarily implement
The main frame external camera implementation method that example is provided, possesses the corresponding functional module of execution method and useful effect
Really.
The embodiment of the present invention additionally provides a kind of mobile terminal, and the host operating system configured is Android operation
System, this terminal includes external connecting-disconnecting interface, also includes that main frame that any embodiment of the present invention provides is external and takes the photograph
Device is realized as head.This external connecting-disconnecting interface is preferably USB interface.When this mobile terminal inserts external
Can use as endoscope during USB camera.
Note, above are only presently preferred embodiments of the present invention and institute's application technology principle.Those skilled in the art
It will be appreciated that the invention is not restricted to specific embodiment described here, can enter for a person skilled in the art
Row various obvious changes, readjust and substitute without departing from protection scope of the present invention.Therefore, though
So by above example, the present invention is described in further detail, but the present invention be not limited only to
Upper embodiment, without departing from the inventive concept, it is also possible to include other Equivalent embodiments more,
And the scope of the present invention is determined by scope of the appended claims.
Claims (9)
1. the implementation method of a main frame external camera, it is characterised in that including:
When host operating system monitors external camera plug, broadcast external camera plug information；
Camera application program receives the broadcast of external camera plug information, by the hardware of host operating system
The operation interface of level of abstraction, produces or discharges photographic head resource instances, and wherein said generation photographic head resource is real
Include during example that the photographic head constructed fuction of host operating system is by traveling through the vision hardware equipment of kernel
Equipment Name Documents under each subdirectory in message catalog, it determines whether for the facility information mesh of external camera
Record, and according to the directory name of facility information catalogue, it is thus achieved that the device node of external camera, outside operating
Putting camera device and gather image, the photographic head constructed fuction of described host operating system is provided by kernel
Video drive interface, calls the device drives that described external camera is corresponding, and according to described external camera
Characterising parameter and described device drives be described external camera generate photographic head resource instances, it is achieved image
Process functional interface, described image function interface completes the form of view data to external camera collection
Conversion and compression；
Described camera application program, by the operation interface of the hardware abstraction layer of host operating system, calls product
Raw photographic head resource instances completes image processing function, and described image processing function at least includes preview, bat
According to and/or video recording；Wherein, when host operating system monitors external camera plug, external camera is broadcasted
Plug information includes: the kernel of host operating system monitors interior nuclear equipment hot plug event by Netlink, and solves
The information that analysis is received by Netlink, it determines the equipment of plug；When described host operating system determines plug
Equipment when being photographic head, broadcast external camera plug information.
Method the most according to claim 1, it is characterised in that camera application program receives external shooting
Head inserts the broadcast of information, by the hardware layer interface of host operating system, produces photographic head resource instances also
Including:
Camera application program receives the broadcast of external camera plug information, by described host operating system
The mark of hardware abstraction layer interface transmission external camera.
Method the most according to claim 1, it is characterised in that camera application program receives external shooting
Head extracts the broadcast of information, by the operation interface of the hardware abstraction layer of host operating system, discharges photographic head
Resource instances includes:
When described camera application program receives the broadcast that external camera extracts information, stop image processing function,
Call the operation interface of host operating system hardware abstraction layer, discharge described photographic head resource instances.
The most according to the method in claim 2 or 3, it is characterised in that described camera application program, logical
Crossing the operation interface of the hardware abstraction layer of host operating system, the photographic head resource instances calling generation completes figure
Include as processing function:
Described camera application program is called by jni, accesses the image processing function interface of photographic head resource instances,
According to the configuration attribute in described photographic head resource instances, use software format transfer function or hardware compression
Device, completes the conversion of the form to view data and compression, and realizes image processing function.
Method the most according to claim 4, it is characterised in that also include:
The kernel of configuration host operating system supports type belonging to external camera, to support that external camera sets
Standby, wherein, the type of described external camera is USB (universal serial bus).
6. a main frame external camera realize device, it is characterised in that including:
Plug broadcast module, when being used for using host operating system to monitor external camera plug, outside broadcast
Put photographic head plug information；
Resource instances operation module, for using camera application program to receive the wide of external camera plug information
Broadcast, by the operation interface of the hardware abstraction layer of host operating system, produce or discharge photographic head resource instances,
Wherein said resource instances operation module includes resource instances creating unit, for using host operating system
Photographic head constructed fuction is by implementor name under each subdirectory in the vision hardware facility information catalogue of traversal kernel
Claim file, it determines whether for the facility information catalogue of external camera, and according to the catalogue of facility information catalogue
Name, it is thus achieved that the device node of external camera, gathers image by operation external camera equipment, uses institute
State the video drive interface that the photographic head constructed fuction of host operating system is provided by kernel, call described outside
Put the device drives that photographic head is corresponding, and according to the characterising parameter of described external camera and described device drives
Photographic head resource instances is generated, it is achieved image processing function interface, described image merit for described external camera
Energy interface completes the form conversion of the view data to external camera collection and compresses；
Image processing module, for using the described camera application program hardware abstraction by host operating system
The operation interface of layer, the photographic head resource instances calling generation completes image processing function, described image procossing
Function at least includes preview, takes pictures and/or record a video；Wherein, plug broadcast module specifically for: use main frame
The kernel of operating system monitored by Netlink in nuclear equipment hot plug event, and resolve and received by Netlink
Information, it determines the equipment of plug；When the equipment that described host operating system determines plug is photographic head,
Broadcast external camera plug information.
Device the most according to claim 6, it is characterised in that:
Resource instances operation module includes: resource instances creating unit and resource instances releasing unit,
Described resource instances creating unit, is additionally operable to use camera application program to receive external camera plug letter
The broadcast of breath, transmits the mark of external camera by the hardware abstraction layer interface of host operating system；
Resource instances releasing unit, is used for using described camera application program to receive external camera and extracts information
Broadcast time, stop image processing function, call the operation interface of host operating system hardware abstraction layer, release
Put described photographic head resource instances；
Image processing module specifically for: use described camera application program to be called by jni, access photographic head
The image processing function interface of resource instances, according to the configuration attribute in described photographic head resource instances, uses
Software format transfer function or hardware compression device, complete the conversion of the form to view data and compression, and real
Existing image processing function.
Device the most according to claim 7, it is characterised in that also include:
Drive layer configuration module, support type belonging to external camera for configuring the kernel of host operating system,
To support external camera equipment, wherein, the type of described external camera is USB (universal serial bus).
9. a mobile terminal, the host operating system configured is Android operation system, and described terminal includes
External connecting-disconnecting interface, it is characterised in that described terminal also includes outside the arbitrary described main frame of claim 6-8
That puts photographic head realizes device.
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