A kind of track complementing method and terminal
Technical field
The present invention relates to terminal to virtual interacting technology, particularly relate to a kind of track complementing method and terminal.
Background technology
Along with the development of intelligent terminal, the requirement of the touch-control of intelligent terminal is more and more higher.In order to further facilitate user
Operation, the screen of terminal not only made pressure sensitivity screen, and the back cover of terminal is provided with equally and can pass through pressure sensing
Realize operates at mobile phone postnotum, currently has and is realized by the mode such as pressure transducer and fingerprint recognition.Pressure transducer pair
The required precision of sensor is higher, more difficult control effect during realizing and during user operation.
When situations below occurs, such as the transducer sensitivity (the most sporadic inefficacy) in proximity sensor arrays and work
State (operative sensor causes the temperature too high near heater members) is the most not quite identical;Or user is difficult to begin in operation
Keeping absolute standard with consistent eventually, during it is possible that sporadic operation is shaken, the track that user slides on rear shell on the back can
Can not be a complete track, it may be possible to multistage track, so, complete track and the track of segmentation be for terminal
It is probably different operations.
Summary of the invention
For solving above-mentioned technical problem, embodiment of the present invention expectation provides a kind of track complementing method and terminal, it is possible to mend
Full track discontinuous problem caused by manual operation or terminal self problem.
The technical scheme is that and be achieved in that:
First aspect, it is provided that a kind of track complementing method, described method includes:
Trace information by continuously slipping two tracks of sensor sensing to user;
When the trace information of described two tracks meets pre-conditioned, determine that described two tracks are two sections of same track
Track;
According to the trace information of described two tracks, determine the trace information lacking track between described two tracks.
Optionally, described trace information includes the positional information of sensor on track, described according to described two tracks
Trace information, determines that the trace information of the disappearance track between described two tracks includes:
Gathering the positional information of n sensor from described two tracks respectively, described n is positive integer;
The positional information of 2n sensor that will collect, is fitted according to the default weight of described 2n sensor,
Obtain the lopcus function after matching;
By described lopcus function, determining the positional information of m sensor on described disappearance track, described m is positive integer.
Optionally, the rule that arranges of described default weight is the sensor the closer to described disappearance track, presets accordingly
Weight is the biggest.
Optionally, described trace information also includes: on track, first sensor sensing to sensing moment of information and is opened
Beginning positional information, the sensing moment of last sensor sensing to information and end position information, the rail of described two tracks
When mark information meets pre-conditioned, determine that described two tracks are that two sections of tracks of same track include:
When determining the sensing of the sensing moment of the first sensor of the first track and last sensor of the second track
The time difference at quarter, the end position information of the first sensor of described first track and last sensing of described second track
Track distance between the position corresponding to end position information of device, described first track occurs early than described second track;
When described time difference is less than the first preset value, and described track distance less than described second preset value time, determine institute
State the first track and described second track is two sections of tracks of same track.
Optionally, the described trace information according to described two tracks, determine the disappearance track between described two tracks
Trace information after, described method also includes:
Trace information by identical strip path curve described in the trace information completion of described disappearance track;
According to the trace information of described identical strip path curve, perform corresponding operation.
Second aspect, it is provided that a kind of terminal, described terminal includes:
Sensing unit, for the trace information of two tracks continuously slipping by sensor sensing to user;
Determine unit, when the trace information of described two tracks meets pre-conditioned, determine that described two tracks are
Two sections of tracks of same track;For the trace information according to described two tracks, determine the disappearance between described two tracks
The trace information of track.
Optionally, described trace information includes the positional information of sensor on track, described determine unit specifically for:
Gathering the positional information of n sensor from described two tracks respectively, described n is positive integer;
The positional information of 2n sensor that will collect, is fitted according to the default weight of described 2n sensor,
Obtain the lopcus function after matching;
By described lopcus function, determining the positional information of m sensor on described disappearance track, described m is positive integer.
Optionally, the rule that arranges of described default weight is the sensor the closer to described disappearance track, presets accordingly
Weight is the biggest.
Optionally, described trace information also includes: on track, first sensor sensing to sensing moment of information and is opened
Beginning positional information, the sensing moment of last sensor sensing to information and end position information, described determine that unit is also used
In:
When determining the sensing of the sensing moment of the first sensor of the first track and last sensor of the second track
The time difference at quarter, the end position information of the first sensor of described first track and last sensing of described second track
Track distance between the position corresponding to end position information of device, described first track occurs early than described second track;
When described time difference is less than the first preset value, and described track distance less than described second preset value time, determine institute
State the first track and described second track is two sections of tracks of same track.
Optionally, described terminal also includes:
Completion unit, for by the trace information of identical strip path curve described in the trace information completion of described disappearance track;
Performance element, for the trace information according to described identical strip path curve, performs corresponding operation.
The embodiment of the present invention provides a kind of track complementing method and terminal, continuously slipping to user by sensor sensing
Article two, the trace information of track;When the trace information of described two tracks meets pre-conditioned, determine that described two tracks are same
Two sections of tracks of one track;According to the trace information of described two tracks, determine disappearance track between described two tracks
Trace information.So, first may determine that whether two tracks are two sections of tracks of identical strip path curve, it is also possible to determine
The trace information of track is lacked between two tracks.So, by the information sensed being carried out instant trajectory analysis process, know
The most also trace information of completion disappearance track, thus promote the recognition accuracy of the continuous operation to continuous path.
Accompanying drawing explanation
Fig. 1 is the hardware architecture diagram of the optional mobile terminal realizing each embodiment of the present invention;
The flow chart of a kind of track complementing method that Fig. 2 provides for the embodiment of the present invention;
The schematic diagram of the sensor array that Fig. 3 provides for the embodiment of the present invention;
The schematic diagram 1 of the first track, the second track and same track that Fig. 4 provides for the embodiment of the present invention;
The schematic diagram 2 of the first track, the second track and same track that Fig. 5 provides for the embodiment of the present invention;
The flow chart of another track complementing method that Fig. 6 provides for the embodiment of the present invention;
The structural representation Fig. 1 of a kind of terminal that Fig. 7 provides for the embodiment of the present invention;
The structural representation Fig. 2 of a kind of terminal that Fig. 8 provides for the embodiment of the present invention;
The structural representation Fig. 3 of a kind of terminal that Fig. 9 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe wholely.
Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
The mobile terminal realizing each embodiment of the present invention is described referring now to accompanying drawing.In follow-up description, use
For representing the suffix explanation only for the beneficially present invention of such as " module ", " parts " or " unit " of element, itself
Not specific meaning.Therefore, " module " can mixedly use with " parts ".
Mobile terminal can be implemented in a variety of manners.Such as, the terminal described in the present invention can include such as moving
Phone, smart phone, notebook computer, digit broadcasting receiver, personal digital assistant (PDA), panel computer (PAD), portable
The mobile terminal of formula multimedia player (PMP), guider etc. and fixing of such as numeral TV, desk computer etc.
Terminal.Hereinafter it is assumed that terminal is mobile terminal.However, it will be understood by those skilled in the art that, except being used in particular for mobile mesh
Element outside, structure according to the embodiment of the present invention can also apply to the terminal of fixed attribute.
Fig. 1 is the hardware architecture diagram of the optional mobile terminal realizing each embodiment of the present invention.
Mobile terminal 100 can bag user input unit 130, sensing unit 140, output unit 150, memorizer 160, control
Device 180 processed and power subsystem 190 etc..Fig. 1 shows the mobile terminal with various assembly, it should be understood that not
Require to implement all assemblies illustrated.Can alternatively implement more or less of assembly.Will be discussed in more detail below mobile whole
The element of end.
User input unit 130 can generate key input data to control each of mobile terminal according to the order of user's input
Plant operation.User input unit 130 allows user to input the information of each attribute, and can include keyboard, metal dome, touch
Plate (such as, detection due to touched and cause resistance, pressure, the sensitive component of change of electric capacity etc.), roller, rocking bar etc.
Deng.Especially, when touch pad is superimposed upon on display unit 151 as a layer, touch screen can be formed.
Sensing unit 140 detects the current state of mobile terminal 100, (such as, mobile terminal 100 open or close shape
State), the position of mobile terminal 100, user is for the presence or absence of contact (that is, touch input) of mobile terminal 100, mobile terminal
Orientation, the acceleration or deceleration of mobile terminal 100 of 100 move and direction etc., and generate for controlling mobile terminal 100
The order of operation or signal.Such as, when mobile terminal 100 is embodied as sliding-type mobile phone, sensing unit 140 can sense
This sliding-type phone opens or cuts out.It addition, sensing unit 140 can detect power subsystem 190 whether provide electric power or
Whether person's interface unit 170 couples with external device (ED).Sensing unit 140 can include that proximity transducer 141 will combine below
This is described by touch screen.
Output unit 150 can include display unit 151, dio Output Modules 152, alarm unit 153 etc..
Display unit 151 may be displayed on the information processed in mobile terminal 100.Such as, it is in electricity when mobile terminal 100
During words call mode, display unit 151 can show and call or other (such as, text messaging, multimedia file that communicate
Download etc.) relevant user interface (UI) or graphic user interface (GUI).When mobile terminal 100 is in video calling pattern
Or during image capture mode, display unit 151 can show image and/or the image of reception of capture, illustrate video or figure
UI or GUI of picture and correlation function etc..
Meanwhile, when display unit 151 and touch pad the most superposed on one another with formed touch screen time, display unit
151 can serve as input equipment and output device.Display unit 151 can include liquid crystal display (LCD), thin film transistor (TFT)
In LCD (TFT-LCD), Organic Light Emitting Diode (OLED) display, flexible display, three-dimensional (3D) display etc. at least
A kind of.Some in these display may be constructed such that transparence is watched from outside with permission user, and this is properly termed as transparent
Display, typical transparent display can for example, transparent organic light emitting diode (TOLED) display etc..According to specific
The embodiment wanted, mobile terminal 100 can include two or more display units (or other display device), such as, move
Dynamic terminal can include outernal display unit (not shown) and inner display unit (not shown).Touch screen can be used for detection and touches
Input pressure and touch input position and touch input area.
Memorizer 160 can store the process performed by controller 180 and the software program controlling operation etc., or can
Temporarily to store the data (such as, telephone directory, message, still image, video etc.) that oneself maybe will export through output.And
And, memorizer 160 can with storage about when touch be applied to touch screen time the vibration of various modes of output and audio signal
Data.
Memorizer 160 can include that the storage medium of at least one attribute, described storage medium include flash memory, hard disk, many
Media card, card-type memorizer (such as, SD or DX memorizer etc.), random access storage device (RAM), static random-access store
Device (SRAM), read only memory (ROM), Electrically Erasable Read Only Memory (EEPROM), programmable read only memory
(PROM), magnetic storage, disk, CD etc..And, mobile terminal 100 can be connected execution memorizer with by network
The network storage device cooperation of the storage function of 160.
Controller 180 generally controls the overall operation of mobile terminal.Such as, controller 180 performs and voice call, data
Control that communication, video calling etc. are relevant and process.It addition, controller 180 can include for reproducing (or playback) many matchmakers
The multi-media module 181 of volume data, multi-media module 181 can construct in controller 180, or it is so structured that with control
Device 180 separates.Controller 180 can perform pattern recognition process, with the handwriting input that will perform on the touchscreen or picture
Draw input and be identified as character or image.
Power subsystem 190 receives external power or internal power under the control of controller 180 and provides operation each unit
Suitable electric power needed for part and assembly.
Various embodiment described herein can be to use such as computer software, hardware or its any combination of calculating
Machine computer-readable recording medium is implemented.Implementing for hardware, embodiment described herein can be by using application-specific IC
(ASIC), digital signal processor (DSP), digital signal processing device (DSPD), programmable logic device (PLD), scene can
Program gate array (FPGA), processor, controller, microcontroller, microprocessor, be designed to perform function described herein
At least one in electronic unit is implemented, and in some cases, such embodiment can be implemented in controller 180.
Software is implemented, the embodiment of such as process or function can with allow to perform the single of at least one function or operation
Software module is implemented.Software code can be come by the software application (or program) write with any suitable programming language
Implementing, software code can be stored in memorizer 160 and be performed by controller 180.
Embodiment one
The embodiment of the present invention provides a kind of track complementing method, as it is shown in figure 1, be applied to terminal, this terminal has sensing
Device array, the method includes:
Step 101, trace information by continuously slipping two tracks of sensor sensing to user.
As in figure 2 it is shown, sensor array is placed in inside back cover, puts sensor array by multiple directions and identify double
Hand position and gesture change.Citing, when screen is just to eyes of user, with during screen traverse as horizontal direction, screen place vertically into
Vertical direction.
1) arranging x sensor in the horizontal direction, the change in primary feedback finger vertical direction, x is more than 2.
Arranging y sensor, the change in primary feedback finger horizontal direction in vertical direction, y is more than 2.
The network become by the array cloth on two above direction is followed the tracks of finger and is changed.
2) a part of sensor angularly α puts biography, and a part of sensor angularly β puts, wherein 0 < alpha-beta≤90.
Such each sensor can feed back the change of finger horizontal and vertical direction simultaneously, is become by above array cloth
Network trace finger changes.
When step 102, the trace information of two tracks meet pre-conditioned, determine that two tracks are two sections of same track
Track.
Described trace information include on track first sensor sensing to sensing moment of information and start position information,
Last sensor sensing is to sensing moment of information and end position information, and step 102 specifically includes:
When determining the sensing of the sensing moment of the first sensor of the first track and last sensor of the second track
The time difference at quarter, the end position information of the first sensor of described first track and last sensing of described second track
Track distance between the position corresponding to end position information of device, described first track occurs early than described second track;
When described time difference is less than the first preset value, and described track distance less than described second preset value time, determine described first rail
Mark and described second track are two sections of tracks of same track.
Step 103, trace information according to two tracks, determine the trace information of disappearance track between two tracks.
Concrete, described trace information includes the positional information of sensor on track, and step 103 includes: from two tracks
The upper positional information gathering n sensor respectively, described n is positive integer;The positional information of 2n sensor that will collect, presses
Default weight according to 2n sensor is fitted, and obtains the lopcus function after matching;By described lopcus function, determine disappearance
The positional information of m sensor on track, described m is positive integer.
Preferably, the rule that arranges presetting weight is the sensor the closer to described disappearance track, presets weight accordingly
The biggest.
So, first may determine that whether two tracks are two sections of tracks of identical strip path curve, it is also possible to determine
The trace information of track is lacked between two tracks.So, by the information sensed being carried out instant trajectory analysis process, know
The most also trace information of completion disappearance track, thus promote the recognition accuracy of the continuous operation to continuous path.
In the present embodiment, concrete approximating method includes:
A, choose n sensor of the first track.Be designated as Q1Q2 respectively ... the biggest expression of ordinal number of Qn, Q from wedge angle
Coordinate is the most remote.Respectively to data point Q1Q2 ... Qn gives corresponding default weight q1q2 ... qn (q1 > q2 ... > qn).This
In, the obtaining value method of weight is a lot, includes but not limited to: A) q1=n;Q2=n-1;... qn=1;B) q1=1;Q2=(n-
1)/n;... q2=1/n etc..
B, same method, choose n sensor of the second track, be designated as H1H2 respectively ... Hn;Use same side
Method gives weight coefficient h1h2 ... hn (h1 > h2 ... > hn).
C, by weight coefficient q1q2 ... qn and h1h2 ... hn is respectively to data Q1Q2 ... Qn and H1H2 ... Hn
It is weighted.
Data after d, use weighting carry out curve fitting;The method of curve matching has a lot, the most frequently used an is young waiter in a wineshop or an inn
Multiplication, the method such as Lagrange's interpolation, Newton interpolating method.The biography being labeled as lacking track is calculated by the curve after matching
The positional information of sensor.
Here, method of least square (also known as least square method) is a kind of mathematical optimization techniques.It is by minimizing error
Quadratic sum finds the optimal function coupling of data.Utilize method of least square can try to achieve the data of the unknown easily, and make this
Between data and the real data tried to achieve a bit, the quadratic sum of error is minimum.Method of least square can be additionally used in curve matching;
In numerical analysis, Lagrange's interpolation is with France's 18th century mathematician Joseph Louis's glug
A kind of polynomial interopolation method of Lang name.Many practical problems all represent certain internal relation or rule with function,
And much function all can only be understood by experiment and observation.As certain physical quantity in practice is observed, at several
Different places obtains corresponding observation, and Lagrange's interpolation can find a multinomial, and it is observed at each just
Point get the value observed.Such multinomial is referred to as Lagrange (interpolation) multinomial.For mathematically, Lagrange is inserted
Value method can provide one just through the polynomial function of several known points on two dimensional surface.
If Newton interpolating method utilizes the functional value that function f (x) is done in certain interval, make suitable specific function,
Given value is taken, by the value of this specific function as the approximation of function f (x) on other interval aspects on these aspects.
Embodiment two
The embodiment of the present invention provides a kind of track complementing method, is applied to terminal, the backboard of this terminal is provided with sensing
Device array Sn, contactless in original state, in Sn, each return value is assumed to Cini, and the method includes:
Step 201, when the sensor sensing of sensor array is to manipulator close to backboard and when moving, obtain motion
The first track on each sensor sensing the return value, positional information and the sensing moment that arrive.
Here, positional information and sensing moment are trace information, the record continuous sequential (TK, TK+ to motor process
1 ...) the return value that arrives of the sensor sensing of successively change and positional information.
Step 202, positional information according to each sensor on the first track, simulate user operation hands at backboard
First track.
Step 203, again sense that manipulator, close to backboard and when moving, obtains when the sensor of sensor array
Return value, positional information and the sensing moment that each sensor sensing on second track of motion arrives.
Step 204, positional information according to each sensor on the second track, simulate user operation hands at backboard
Second track.
Step 205, the sensing moment determining the first sensor of the first track and last sensor of the second track
The time difference in sensing moment.
Here, the sensing moment of the first sensor of the first track is finish time of the first track, and the second track is
The start time that the sensing moment is the second track of latter sensors.
Last of step 206, the end position information determining the first sensor of the first track and the second track passes
Track distance between the position corresponding to end position information of sensor.
Step 207, judge time difference whether less than the first preset value, whether track distance less than the second preset value.If all
It is then to perform step 206;If at least one is no, then terminate this flow process.
Step 208, from two tracks, gather the positional information of 20 sensors respectively.
Step 209, the positional information of 40 sensors that will collect, intend according to the default weight of 40 sensors
Close, obtain the lopcus function after matching.
Here, default weight is arranged according to preset rules, the sensor that distance disappearance track is the nearest, presets weight more
Greatly.
Step 210, by lopcus function, determine the positional information of m sensor on disappearance track.
Here, the positional information of all of sensor can be substituted into this lopcus function by the sensor on disappearance track, as
The value that fruit has the value function of the positional information calculation of a sensor to calculate is less than the 3rd preset value, then using sensor as lacking
Losing the sensor on track, accordingly, its positional information is the positional information of sensor on disappearance track.
Step 211, the trace information of trace information completion identical strip path curve by disappearance track.
According to the trace information of identical strip path curve, perform corresponding operation.
Embodiment three
The embodiment of the present invention provides a kind of terminal 30, and described terminal 30 includes:
Sensing unit 301, for the trace information of two tracks continuously slipping by sensor sensing to user.
Determine unit 302, when the trace information of described two tracks meets pre-conditioned, determine described two tracks
It is two sections of tracks of same track;For the trace information according to described two tracks, determine lacking between described two tracks
Lose the trace information of track.
So, first may determine that whether two tracks are two sections of tracks of identical strip path curve, it is also possible to determine
The trace information of track is lacked between two tracks.So, by the information sensed being carried out instant trajectory analysis process, know
The most also trace information of completion disappearance track, thus promote the recognition accuracy of the continuous operation to continuous path.
Further, described trace information includes the positional information of sensor on track, described determines that unit 302 is specifically used
In:
Gathering the positional information of n sensor from described two tracks respectively, described n is positive integer;
The positional information of 2n sensor that will collect, is fitted according to the default weight of described 2n sensor,
Obtain the lopcus function after matching;
By described lopcus function, determining the positional information of m sensor on described disappearance track, described m is positive integer.
Preferably, the rule that arranges of described default weight is the sensor the closer to described disappearance track, presets accordingly
Weight is the biggest.
Further, described trace information also includes: on track first sensor sensing to information the sensing moment and
Start position information, the sensing moment of last sensor sensing to information and end position information, described determine unit 302
It is additionally operable to:
When determining the sensing of the sensing moment of the first sensor of the first track and last sensor of the second track
The time difference at quarter, the end position information of the first sensor of described first track and last sensing of described second track
Track distance between the position corresponding to end position information of device, described first track occurs early than described second track;
When described time difference is less than the first preset value, and described track distance less than described second preset value time, determine institute
State the first track and described second track is two sections of tracks of same track.
Further, described terminal 30 also includes:
Completion unit 303, for believing by the track of identical strip path curve described in the trace information completion of described disappearance track
Breath.
Performance element 304, for the trace information according to described identical strip path curve, performs corresponding operation.
Embodiment four
The embodiment of the present invention provides a kind of terminal 40, and described terminal 40 includes:
Sensor 401, for the trace information of two tracks continuously slipping by sensor sensing to user.
Processor 402, when the trace information of described two tracks meets pre-conditioned, determines that described two tracks are
Two sections of tracks of same track;For the trace information according to described two tracks, determine the disappearance between described two tracks
The trace information of track.
So, first may determine that whether two tracks are two sections of tracks of identical strip path curve, it is also possible to determine
The trace information of track is lacked between two tracks.So, by the information sensed being carried out instant trajectory analysis process, know
The most also trace information of completion disappearance track, thus promote the recognition accuracy of the continuous operation to continuous path.
Further, described trace information includes that the positional information of sensor on track, described processor 402 are specifically used
In:
Gathering the positional information of n sensor from described two tracks respectively, described n is positive integer;
The positional information of 2n sensor that will collect, is fitted according to the default weight of described 2n sensor,
Obtain the lopcus function after matching;
By described lopcus function, determining the positional information of m sensor on described disappearance track, described m is positive integer.
Preferably, the rule that arranges of described default weight is the sensor the closer to described disappearance track, presets accordingly
Weight is the biggest.
Further, described trace information also includes: on track first sensor sensing to information the sensing moment and
Start position information, the sensing moment of last sensor sensing to information and end position information, described processor 402 is also
For:
When determining the sensing of the sensing moment of the first sensor of the first track and last sensor of the second track
The time difference at quarter, the end position information of the first sensor of described first track and last sensing of described second track
Track distance between the position corresponding to end position information of device, described first track occurs early than described second track;
When described time difference is less than the first preset value, and described track distance less than described second preset value time, determine institute
State the first track and described second track is two sections of tracks of same track.
Further, described terminal 40 also includes:
Processor 402 is additionally operable to: believed by the track of identical strip path curve described in the trace information completion of described disappearance track
Breath;According to the trace information of described identical strip path curve, perform corresponding operation.
Those skilled in the art are it should be appreciated that embodiments of the invention can be provided as method, system or computer program
Product.Therefore, the shape of the embodiment in terms of the present invention can use hardware embodiment, software implementation or combine software and hardware
Formula.And, the present invention can use can be with storage at one or more computer wherein including computer usable program code
The form of the upper computer program implemented of medium (including but not limited to disk memory and optical memory etc.).
The present invention is with reference to method, equipment (system) and the flow process of computer program according to embodiments of the present invention
Figure and/or block diagram describe.It should be understood that can the most first-class by computer program instructions flowchart and/or block diagram
Flow process in journey and/or square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
Instruction arrives the processor of general purpose computer, special-purpose computer, Embedded Processor or other programmable data processing device to produce
A raw machine so that the instruction performed by the processor of computer or other programmable data processing device is produced for real
The device of the function specified in one flow process of flow chart or multiple stage flow process and/or one square frame of block diagram or multiple stage square frame now.
These computer program instructions may be alternatively stored in and computer or other programmable data processing device can be guided with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in this computer-readable memory produces and includes referring to
Make the manufacture of device, this command device realize at one flow process of flow chart or multiple stage flow process and/or one square frame of block diagram or
The function specified in multiple stage square frame.
These computer program instructions also can be loaded in computer or other programmable data processing device so that at meter
Perform sequence of operations step on calculation machine or other programmable devices to produce computer implemented process, thus at computer or
The instruction performed on other programmable devices provides for realizing at one flow process of flow chart or multiple stage flow process and/or block diagram one
The step of the function specified in platform square frame or multiple stage square frame.
The above, only presently preferred embodiments of the present invention, it is not intended to limit protection scope of the present invention.