CN103559150A - Realizing method and device for external camera of host, and mobile terminal - Google Patents
Realizing method and device for external camera of host, and mobile terminal Download PDFInfo
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Abstract
The embodiment of the invention provides a realizing method and device for an external camera of a host, and a mobile terminal. The method comprises the steps of when a host operation system monitors the condition that the external camera is plugged or unplugged, broadcasting the plugging-unplugging information of the external camera; using a camera application program to receive the broadcasting of the plugging-unplugging information of the external camera, and generating or releasing a camera resource example by the operation interface of a hardware abstraction layer of the host operation system; enabling the camera application program to call the generated camera resource example by the operation interface of the hardware abstraction layer of the host operation system so as to finish an image processing function. The source example of the external camera is realized by software, so the external camera is virtualized to the internal camera of the host, and further the processing function for an image collected by the external camera is realized. As the external camera can be conveniently plugged on or unplugged from the host, so the operation is flexible and convenient, and no extra hardware and software improvement is needed, and the realizing cost is low.
Description
Technical field
The embodiment of the present invention relates to computer equipment technology, relates in particular to a kind of implementation method and device and mobile terminal of main frame external camera.
Background technology
Scope, also claims endoscope, is a kind of multidisciplinary general instrument, and its function is to detect crooked pipeline depths, can in sealed cavity, observe interior spatial structure and state for observing the position that can not look at straight, can realize distant surveillance and operation.Industrial endoscope can be in the situation that not needing dismounting or destruction assembling and equipment out of service, realize Non-Destructive Testing, be widely used in each department of the modern core industry such as aviation, automobile, boats and ships, electric, chemical, electric power, coal gas, atomic energy, civil construction.
Existing endoscope is comprised of main frame and sound-pipe, and sound-pipe is camera, and for gathering image, it is connected to after main frame, by the device in main frame, is completed image preview and is taken pictures.
Thus, prior art need to increase related device and coordinate and realize endoscope in main frame, the defect that this has brought equipment cost to improve.
Summary of the invention
The embodiment of the present invention provides a kind of implementation method and device and mobile terminal of main frame external camera, realizes the cost of external camera to reduce main frame.
The embodiment of the present invention provides a kind of implementation method of main frame external camera, comprising:
When host operating system monitors external camera plug, broadcast external camera plug information;
Camera application program is received the broadcast of external camera plug information, and the operation-interface of the hardware abstraction layer by host operating system produces or discharges camera resource example;
Described camera application program, the operation-interface of the hardware abstraction layer by host operating system, the camera resource example that calls generation completes image processing function, and described image processing function at least comprises preview, takes pictures and/or records a video.
The embodiment of the present invention also provides a kind of implement device of main frame external camera, comprising:
Plug broadcast module, while plugging for adopting host operating system to monitor external camera, broadcast external camera plug information;
Resource example operation module, for adopting camera application program to receive the broadcast of external camera plug information, the operation-interface of the hardware abstraction layer by host operating system, produces or discharges camera resource example;
Image processing module, for adopting described camera application program by the operation-interface of the hardware abstraction layer of host operating system, the camera resource example that calls generation completes image processing function, and described image processing function at least comprises preview, takes pictures and/or records a video.
The embodiment of the present invention provides again a kind of mobile terminal, and the host operating system configuring is Android operating system, and described terminal comprises external connecting-disconnecting interface, and described terminal also comprises the implement device of the main frame external camera that any embodiment of the present invention provides.
The technical scheme of the embodiment of the present invention, realizes resource example by external camera by software, thus the virtual built-in camera that turns to this main frame, and then can realize the processing capacity of image that this external camera gathers.Because main frame can plug external camera easily, thus easy to operate, flexible, and improve without extra hardware and software, the cost of therefore realizing is low.
Accompanying drawing explanation
The process flow diagram of the implementation method of the main frame external camera that Fig. 1 provides for the embodiment of the present invention one;
The process flow diagram 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 of the implement device of the main frame external camera that Fig. 3 provides for the embodiment of the present invention three.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not entire infrastructure.
Embodiment mono-
The process flow diagram of the implementation method of the main frame external camera that Fig. 1 provides for the embodiment of the present invention one, the present embodiment applicable on main frame can plug form to connect external camera, carry out the situation of image processing, particularly preferred scene is, on the mobile terminal of realizing with Android (Android) host operating system, plug external camera is realized endoscope.The implement device of the main frame external camera that the method can be realized by software is carried out, and this device is configured in the mobile phone such as mobile terminal.
The method of the present embodiment specifically comprises the steps:
When step 110, host operating system monitor external camera plug, broadcast external camera plug information;
For step 120 and 140, camera application program can be identified the particular content of plug information, and then completes the operation that produces or discharge camera resource example.
The technical scheme of the embodiment of the present invention, realizes resource example by external camera by software, thus the virtual built-in camera that turns to this main frame, and then can realize the processing capacity of image that this external camera gathers.Because main frame can plug external camera easily, thus easy to operate, flexible, and improve without extra hardware and software, the cost of therefore realizing is low.
Embodiment bis-
The process flow diagram of the implementation method of the main frame external camera that Fig. 2 provides for the embodiment of the present invention two, the present embodiment be take previous embodiment provides a preferred embodiment as basis.
In the present embodiment, interface type under external camera is USB (universal serial bus) (Universal Serial Bus, be called for short USB), other protocol ports that the affiliated interface type of external camera also can select main frame to provide are provided.
The host operating system of the present embodiment be take Android system as example, and its kernel adopting is Linux.The function of the set-up function that Android system possesses and interface also can be realized similar functions in other host operating systems, are only title difference.
Based on above-mentioned situation, the method for the present embodiment specifically comprises the steps:
The kernel of step 210, configure host operating system is supported the affiliated type of external camera, and to support external camera equipment, 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 main frame itself has been supported the external camera of certain type, without the configuration repeating.The Android system of take the below configuration USB camera configuration means concrete as example illustrates.Video4linux is about the kernel-driven of video equipment in linux, its application programming for video equipment provides consistent DLL (dynamic link library), UVC class in linux can complete the support for USB camera, by USB_VIDEO_CLASS in kernel setup file is chosen as Y can generate kernel device drives, thereby in can completing, check the driving layer support of USB camera.
When the host operating system in embodiment mono-monitors external camera plug, the operation of broadcast external camera plug information specifically can comprise:
The kernel of step 220, host operating system is monitored interior nuclear equipment plug event by Netlink, and resolves the information of receiving by Netlink, differentiates the equipment of plug;
In aforesaid operations, Netlink(network linking) be such as the mechanism of carrying out communication between the consumer process such as camera application program and kernel system.User space program can create AF_NETLINK protocol family, and protocol type is the socket of NETLINK_KOBJECT_UEVENT type, and the plug information of equipment on acceptable system, comprises the information such as device type of extracting of inserting in plug information.
When step 230, the equipment that determines plug when described host operating system are camera, broadcast external camera plug information;
Above-mentioned steps 220 and 230 can realize the automatic switchover of main frame to camera.For the main frame that has built-in camera, there is the problem of priority access in built-in camera and external camera simultaneously while existing.It is example that the mobile terminal of Android system of take inserts USB camera, realizes and inserts priority access USB camera in USB camera situation, extracts in USB camera situation, preserves the relevant data of taking pictures and record a video, and is switched to built-in camera.Concrete executive means can be:
UsbService(USB service) be UsbHostManager(USB host manager) power function in host operating system, can monitoring system whether there is USB camera plug event, and broadcast by sending Android Broadcast(Android) notify.
In embodiment mono-, camera application program is received the broadcast of external camera plug information, the operation-interface of the hardware abstraction layer by host operating system, produces or the operation that discharges camera resource example can be divided into two operating process of inserting camera and extracting camera.Insert camera, the operating process that produces camera resource example specifically comprises:
It is example that the Android system of take inserts USB camera, and when USB camera inserts, startup camera application program, preferentially selects USB camera, if camera application program when front stage operation, automatically switching to USB camera is current camera.Can utilize existing realization mechanism to realize image to process by external camera being encapsulated as to built-in camera.
Concrete, camera application program generally can be transmitted by the hardware abstraction layer interface of host operating system the sign of built-in camera, for example, by the open method of hw_module_methods_t structure, transmit camera ID(numerical character) open different cameras.Can establish set and represent front-facing camera, " 0 " represents post-positioned pick-up head.In open method, according to the difference of camera ID, host operating system can be carried out different initialization to different cameras.When realizing external camera, with the ID of external camera, replace the ID of built-in camera.Opening in preposition or post-positioned pick-up head situation, with external camera sign, replacing built-in camera sign, to control camera constructed fuction, carrying out the initialization of USB camera resource, thereby realize, USB camera is being encapsulated as to front-facing camera.
The camera constructed fuction of step 250, described host operating system is by device name file under each sub-directory in the vision hardware facility information catalogue of traversal kernel, whether differentiate is the facility information catalogue of external camera, and according to the directory name of facility information catalogue, obtain the device node of external camera, by operation external camera equipment, gather image;
The video drive interface that the camera constructed fuction of step 260, described host operating system provides by kernel, call the device drives that described external camera is corresponding, and be that described external camera generates camera resource example according to the characterising parameter of described external camera and described device drives, realize image processing function interface, in described image function interface, complete the format conversion of the view data of external camera collection and compression.
In above-mentioned steps, according to the camera ID transmitting, the camera constructed fuction (CameraHardwareSec) of host operating system carries out the initialization of corresponding camera resource.Initialization has comprised unlatching and the configuration software resource of control hardware node.In in step 250, vision hardware facility information catalogue by traversal kernel (sys/class/video4linux/video[0～n] content of storing in device name (name) file under lower each sub-directory, confirm whether the camera device that this device node is corresponding is " usb camera ".That is, identify successively the title of each node, judge whether this node is USB camera.If so, search corresponding device node, specifically, according to the afterbody numeral " d " of the title of device name place sub-directory, in the catalogue (/dev/videod) of device node, search corresponding device node.And then can control and open corresponding device node, initialization related resource.
For software resource configuration, in step 260, specifically call the device drives that external camera is corresponding, and according to the characterising parameter of external camera, parameters such as pixel, size, for external camera generates camera resource example, realizes image processing function interface.
Specifically, camera application program is generally realized by java applet, and hardware abstraction layer is realized by c/c++ program, camera application program can be by local interface (the Java Native Interface of Java, JNI) the structure camera_device_ops_t operation-interface of indirect call hardware abstraction layer, completes the operation to camera.In the image function interface of encapsulation, by the hardware compression device on software or Android main process equipment, complete from USB camera output format, such as YUV RGB etc., to preview take pictures video recording input format conversion, obtain preview take pictures video recording needed view data.
The preview video process of taking pictures can complete the function treatment flow process of different cameras in image processing function Interface realization flow process according to CameraHardwareSec class mCameraID attribute, for example " 1 " represents front-facing camera, " 0 " table post-positioned pick-up head.
In above-mentioned steps, when USB camera is extracted, camera application program can start post-positioned pick-up head or out of service.Under situation is taken pictures in video recording, can preserve in time recorded video, releasing resource, protection equipment.
The embodiment of the present invention, is Android system main process equipment built-in camera by USB camera by software encapsulation, can complete the scheme of endoscope function.In realizing the process of external camera: encapsulation USB camera also provides the operation-interface consistent with built-in camera, thereby camera application program can without differences be processed USB external camera and built-in camera.This scheme, by each video equipment sub-directory information of catalogue under traversal sys file system, obtains device node corresponding to USB external camera.This scheme plugs event by audiomonitor, can carry out camera automatic switchover according to camera plug.System is by Netlink and kernel communication, the equipment that obtains inserts the information of extracting, send the broadcast of interventional instrument information information such as () VENDOR_ID and PRODUCT_ID, receive the plug message of broadcast and filtering USB camera, notify camera application program to switch camera.
Compared with prior art, in the technical scheme that the embodiment of the present invention proposes, there is following some advantage:
1, by USB camera, by panel computer or the mobile terminal of Android system, can by software, realize the function of endoscope, without additional hardware equipment, reduce cost;
2, USB plug detects with broadcast message form and realizes, and can complete after inserting camera and automatically switch;
3, external camera plug is convenient, replaces detecting lenses flexible;
4, without utilizing fixed host computer, can utilize the function of existing all types of main frames, for example touch screen interactive, more more humane than the operation of conventional keys formula.
Embodiment tri-
The structural representation of the implement device of the main frame external camera that Fig. 3 provides for the embodiment of the present invention three, this device comprises: plug broadcast module 310, resource example operation module 320 and image processing module 330.
Wherein, when plug broadcast module 310 plugs for adopting host operating system to monitor external camera, broadcast external camera plug information; Resource example operation module 320 is for adopting camera application program to receive the broadcast of external camera plug information, and the operation-interface of the hardware abstraction layer by host operating system produces or discharges camera resource example; Image processing module 330 is for adopting described camera application program by the operation-interface of the hardware abstraction layer of host operating system, the camera resource example that calls generation completes image processing function, and described image processing function at least comprises preview, takes pictures and/or records a video.
On the basis of such scheme, preferably:
Plug broadcast module 310 specifically for: adopt the kernel of host operating system by Netlink, monitors in nuclear equipment plug event, and resolve the information of receiving by Netlink, differentiate the equipment plugging; When the equipment that determines plug when described host operating system is camera, broadcast external camera plug information;
Resource example operation module 320 comprises: resource example creating unit 321 and resource example releasing unit 322.
Described resource example creating unit 321, for adopting camera application program to receive the broadcast of external camera plug information, transmits the sign of external camera by the hardware abstraction layer interface of host operating system; Adopt the camera constructed fuction of described host operating system by device name file under each sub-directory in the vision hardware facility information catalogue of traversal kernel, whether differentiate is the facility information catalogue of external camera, and according to the directory name of facility information catalogue, obtain the device node of external camera, by operation external camera equipment, gather image; The video drive interface that adopts the camera constructed fuction of described host operating system to provide by kernel, call the device drives that described external camera is corresponding, and be that described external camera generates camera resource example according to the characterising parameter of described external camera and described device drives, realize image processing function interface, in described image function interface, complete the format conversion of the view data of external camera collection and compression.
Resource example releasing unit 322 when adopting described camera application program to receive that external camera is extracted the broadcast of information, stops image processing function, calls the operation-interface of host operating system hardware abstraction layer, discharges described camera resource example.
Further, this device also can comprise: drive layer configuration module 340, for type under the kernel support external camera of configure host operating system, to support external camera equipment, wherein, the type of described external camera is USB (universal serial bus).
The main frame external camera implement device that the embodiment of the present invention provides can be used for carrying out the main frame external camera implementation method that any embodiment of the present invention provides, and possesses the corresponding functional module of manner of execution and beneficial effect.
The embodiment of the present invention also provides a kind of mobile terminal, and the host operating system configuring is Android operating system, and this terminal comprises external connecting-disconnecting interface, also comprises the implement device of the main frame external camera that any embodiment of the present invention provides.This external connecting-disconnecting interface is preferably USB interface.When this mobile terminal inserts external USB camera, can be used as endoscope uses.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (10)
1. an implementation method for main frame external camera, is characterized in that, comprising:
When host operating system monitors external camera plug, broadcast external camera plug information;
Camera application program is received the broadcast of external camera plug information, and the operation-interface of the hardware abstraction layer by host operating system produces or discharges camera resource example;
Described camera application program, the operation-interface of the hardware abstraction layer by host operating system, the camera resource example that calls generation completes image processing function, and described image processing function at least comprises preview, takes pictures and/or records a video.
2. method according to claim 1, is characterized in that, when host operating system monitors external camera plug, broadcast external camera plug information comprises:
The kernel of host operating system is monitored interior nuclear equipment plug event by Netlink, and resolves the information of receiving by Netlink, differentiates the equipment of plug;
When the equipment that determines plug when described host operating system is camera, broadcast external camera plug information.
3. method according to claim 2, is characterized in that, camera application program receives that external camera inserts the broadcast of information, by the hardware layer interface of host operating system, produces camera resource example and comprises:
Camera application program is received the broadcast of external camera plug information, transmits the sign of external camera by the hardware abstraction layer interface of host operating system;
The camera constructed fuction of described host operating system is by device name file under each sub-directory in the vision hardware facility information catalogue of traversal kernel, whether differentiate is the facility information catalogue of external camera, and according to the directory name of facility information catalogue, obtain the device node of external camera, by operation external camera equipment, gather image;
The video drive interface that the camera constructed fuction of described host operating system provides by kernel, call the device drives that described external camera is corresponding, and be that described external camera generates camera resource example according to the characterising parameter of described external camera and described device drives, realize image processing function interface, in described image function interface, complete the format conversion of the view data of external camera collection and compression.
4. method according to claim 2, is characterized in that, camera application program receives that external camera extracts the broadcast of information, and the operation-interface of the hardware abstraction layer by host operating system, discharges camera resource example and comprise:
Described camera application program is received when external camera is extracted the broadcast of information, stops image processing function, calls the operation-interface of host operating system hardware abstraction layer, discharges described camera resource example.
5. according to the method described in claim 3 or 4, it is characterized in that, described camera application program, the operation-interface of the hardware abstraction layer by host operating system, the camera resource example that calls generation completes image processing function and comprises:
Described camera application program is called by jni, the image processing function interface of access camera resource example, according to the configuration attribute in described camera resource example, adopt software format transfer function or hardware compression device, complete the format conversion of view data and compression, and realize image processing function.
6. method according to claim 5, is characterized in that, also comprises:
The kernel of configure host operating system is supported the affiliated type of external camera, and to support external camera equipment, wherein, the type of described external camera is USB (universal serial bus).
7. an implement device for main frame external camera, is characterized in that, comprising:
Plug broadcast module, while plugging for adopting host operating system to monitor external camera, broadcast external camera plug information;
Resource example operation module, for adopting camera application program to receive the broadcast of external camera plug information, the operation-interface of the hardware abstraction layer by host operating system, produces or discharges camera resource example;
Image processing module, for adopting described camera application program by the operation-interface of the hardware abstraction layer of host operating system, the camera resource example that calls generation completes image processing function, and described image processing function at least comprises preview, takes pictures and/or records a video.
8. device according to claim 7, is characterized in that:
Plug broadcast module specifically for: adopt the kernel of host operating system by Netlink, monitors in nuclear equipment plug event, and resolve the information of receiving by Netlink, differentiate the equipment plugging; When the equipment that determines plug when described host operating system is camera, broadcast external camera plug information;
Resource example operation module comprises: resource example creating unit and resource example releasing unit,
Described resource example creating unit, for adopting camera application program to receive the broadcast of external camera plug information, transmits the sign of external camera by the hardware abstraction layer interface of host operating system; Adopt the camera constructed fuction of described host operating system by device name file under each sub-directory in the vision hardware facility information catalogue of traversal kernel, whether differentiate is the facility information catalogue of external camera, and according to the directory name of facility information catalogue, obtain the device node of external camera, by operation external camera equipment, gather image; The video drive interface that adopts the camera constructed fuction of described host operating system to provide by kernel, call the device drives that described external camera is corresponding, and be that described external camera generates camera resource example according to the characterising parameter of described external camera and described device drives, realize image processing function interface, in described image function interface, complete the format conversion of the view data of external camera collection and compression;
Resource example releasing unit, when adopting described camera application program to receive that external camera is extracted the broadcast of information, stops image processing function, calls the operation-interface of host operating system hardware abstraction layer, discharges described camera resource example;
Image processing module specifically for: adopt described camera application program to call by jni, the image processing function interface of access camera resource example, according to the configuration attribute in described camera resource example, adopt software format transfer function or hardware compression device, complete the format conversion of view data and compression, and realize image processing function.
9. device according to claim 8, is characterized in that, also comprises:
Drive layer configuration module, for type under the kernel support external camera of configure host operating system, to support external camera equipment, wherein, the type of described external camera is USB (universal serial bus).
10. a mobile terminal, the host operating system configuring is Android operating system, and described terminal comprises external connecting-disconnecting interface, it is characterized in that, and described terminal also comprises the implement device of the arbitrary described main frame external camera of claim 7-9.
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| CN104133711A (en) * | 2014-08-07 | 2014-11-05 | 深圳市元征科技股份有限公司 | Camera safe switching method based on Android system |
| CN104133711B (en) * | 2014-08-07 | 2017-08-15 | 深圳市元征科技股份有限公司 | Camera safe switching method based on android system |
| WO2015117441A1 (en) * | 2014-08-19 | 2015-08-13 | 中兴通讯股份有限公司 | Mobile terminal, and automatic external lens recognition method, device, and storage medium |
| CN105357360A (en) * | 2014-08-19 | 2016-02-24 | 中兴通讯股份有限公司 | Mobile terminal, and method and device for automatically identifying external camera of mobile terminal |
| CN104484181A (en) * | 2014-12-23 | 2015-04-01 | 北京元心科技有限公司 | Method, device and mobile device for controlling Android camera under glibc environment |
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