CN106501940A - A kind of height degree of immersing Head-mounted display control system - Google Patents
A kind of height degree of immersing Head-mounted display control system Download PDFInfo
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
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- G—PHYSICS
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- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
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- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/014—Head-up displays characterised by optical features comprising information/image processing systems
Abstract
The invention discloses a kind of height degree of immersing Head-mounted display control system, including：Central processing unit, for assisting FPGA module to carry out the process of image information；3D processing modules, for carrying out 3D process to image；Video module, for input video information；FPGA module, is wirelessly connected with central processing unit, 3D processing modules, video module and SDRAM；Video information for realizing 3D processing modules, between video module and D/A converter module is exchanged；SDRAM, for realizing that video information freely specifies address to be written and read；D/A converter module, with FPGA module wired connection；For realizing the digital-to-analogue conversion of video system；Display module, with D/A converter module wired connection；Video information for logarithmic mode conversion is shown.The present invention calculates the orientation of Helmet Mounted Display by gyro and geomagnetic sensor, so as to change user visual angle in the scene, the feeling of immersion of raising user and interactive.
Description
Technical field
A kind of the invention belongs to display technology field, more particularly to height degree of immersing Head-mounted display control system.
Background technology
As big screen intelligent mobile phone, intelligent television, HDTV etc. are progressively popularized, HD video resource is made increasingly to increase
Many.The display of the virtual reality such as computer graphics techniques, human-machine interface technology core technology and VR equipment, algorithm, interaction skill
The development of art.The fast lifting band of the original technologies such as monitor resolution lifting, video card rendering effect and 3D Real-time modeling set abilities
Come the lightweight of VR equipment, facilitation and become more meticulous, so as to greatly improve the experience of VR equipment, virtual reality commercialization,
Popular it is expected to be achieved.High refresh rate, the image of high-resolution display system VR Helmet Mounted Display through optical amplifier,
Project in eyes, in order to prevent screen from screen window effect occur, (screen window effect refers to after image amplification, it can be seen that the picture of a grain
Element, just as seeing object by screen window), resolution must reach height.High-resolution is conflicting, high score with high refresh rate
What resolution was brought is high data volume, also just has influence on the raising of refresh rate, therefore, selects a suitable parameter aobvious to the VR helmets
Show that the performance impact of device is very crucial.
In sum, existing virtual reality technology major part is all only to provide stereoscopic vision, without moving user
Feed back to virtual scene, the viewing scene that user can only be passive, without interactive, feeling of immersion is low.
Content of the invention
It is an object of the invention to provide a kind of height degree of immersing Head-mounted display control system, it is intended to solve in prior art
The action of user is not fed back to virtual scene, the viewing scene that user can only be passive, without interactive, feeling of immersion is low to ask
Topic.
The present invention is achieved in that a kind of height degree of immersing virtual reality Head-mounted display control system, the height are immersed
Degree Head-mounted display includes：
Central processing unit, for assisting FPGA module to carry out the process of image information；
3D processing modules, for carrying out 3D process to image；
Video module, for input video information；
FPGA module, is wirelessly connected with central processing unit, 3D processing modules, video module and SDRAM；For realizing at 3D
Reason module, the video information between video module and D/A converter module are exchanged；
SDRAM, for realizing that video information freely specifies address to be written and read；
D/A converter module, with FPGA module wired connection；For realizing the digital-to-analogue conversion of video system；
Display module, with D/A converter module wired connection；Video information for logarithmic mode conversion is shown.
Further, the central processing unit is provided with energy detection module, the energy measuring side of the energy detection module
Method includes：
The first step, the FFT that the radio frequency in Reived_V1 or Reived_V2 or if sampling signal are carried out NFFT points
Computing, then modulus computing are stored in front NFFT/2 point therein in VectorF, save the width of signal x2 in VectorF
Degree spectrum；
Second step, is the equal Block, N=3,4 of N blocks by analysis bandwidth Bs point ... .., each Block will be carried out
The a width of Bs/N of the band of computing, if the low-limit frequency that will analyze bandwidth Bs is FL, FL=0 here, then block nBlock, n=1...N,
Corresponding frequency separation scope is [FL+ (n-1) Bs/N, FL+ (n) Bs/N] respectively, by the frequency of corresponding frequency range in VectorF
Rate point distributes to each block, and the VectorF point ranges that wherein nBlock divides are [Sn, Sn+kn], whereinThe number of per section of Frequency point that gets is represented, and
Represented is starting point, and fs is signal sampling frequencies, and round (*) represents the computing that rounds up；
3rd step, seeks the energy Σ of its frequency spectrum to each Block | | 2, obtain E (n), n=1...N；
4th step, averages to vectorial E
5th step, try to achieve vectorial E variance and
6th step, updates flag bit flag, flag=0, represents that a front testing result is no signal, this kind of under the conditions of,
Only work as σsum>It is judged to during K2 that currently detected signal, flag are changed into 1；Work as flag=1, represent that a front testing result is have
Signal, this kind of under the conditions of, only as σ sum<It is judged to currently be not detected by signal during K1, flag is changed into 0, K1 and K2 for thresholding
Value, is given from empirical value with theoretical simulation, K2>K1；
According to flag bit, 7th step, controls whether subsequent demodulation thread etc. is opened：Flag=1, opens subsequent demodulation thread
Deng, otherwise close subsequent demodulation thread.
Further, the video module overlaps the diagonal slices of MASK signal of change cyclic bispectrums to the time-frequency for receiving
Spectrum, and intercept and be carried out as follows in the section of f=0：
Time-frequency overlaps the signal model of MASK and is expressed as：
Wherein, component of signal numbers of the N for time-frequency overlapped signal, n (t) is additive white Gaussian noise, siT () is time-frequency weight
The component of signal of folded signal, is expressed asA in formulaiRepresent signal point
The amplitude of amount, aiM () represents that the symbol of component of signal, p (t) represent molding filter function, TiRepresent the code element of component of signal
Cycle, fciThe carrier frequency of component of signal is represented,Represent the phase place of component of signal；
The diagonal slice spectrum of the cyclic bispectrum of MASK signals is expressed as：
Wherein, y (t) represents MASK signals, and α is the cycle frequency of y (t), fcThe carrier frequency of signal is represented, T is signal
Code-element period, k is integer,Ca,3The Third-order cumulants of random sequences a are represented, δ () is impulse function, P (f)
It is molding impulse function, expression formula is：
F=0 sections are taken to the diagonal slice spectrum of cyclic bispectrum to obtain：
The diagonal slice spectrum of cyclic bispectrum meets linear superposition, then time-frequency overlaps the cutting on the cross of MASK signal cycle bispectrums
Piece spectrum expression formula be：
Wherein,It is constant, T relevant with the modulation system of i-th component of signaliIt is the code element week of i-th component of signal
Phase；
Which is intercepted in the section of f=0：
For when frequency aliasing signal cyclic bispectrum diagonal slice spectrum f=0, in α=fcThere is peak value in place, and carry letter
Number carrier frequency information.
Further, the video module is provided with digital modulation signals computing unit；The digital modulation signals unit meter
The fractional lower-order ambiguity function for calculating digital modulation signals is carried out according to the following steps：
Receive signal y (t) to be expressed as：
Y (t)=x (t)+n (t)
Wherein, x (t) is digital modulation signals, and n (t) is the impulsive noise of obedience standard S α S distributions.For MASK and
MPSK is modulated, and the analytical form of x (t) is expressed as：
Wherein, N is sampling number, anFor the information symbol for sending, in MASK signals, an=0,1,2 ..., M-1, M are
Order of modulation, in mpsk signal, an=ej2πε/M, ε=0,1,2 ..., M-1, g (t) represent rectangle molding pulse, TbRepresent symbol
Number cycle, fcRepresent carrier frequency, carrier wave initial phaseIt is equally distributed random number in [0,2 π].Adjust for MFSK
System, the analytical form of x (t) are expressed as：
Wherein, fmFor the side-play amount of m-th carrier frequency, if MFSK signals carrier shift is Δ f, fm=-(M-1) Δ f ,-
(M-3) Δ f ..., (M-3) Δ f, (M-1) Δ f, carrier wave initial phaseIt is equally distributed random number in [0,2 π].
Its distribution character is described with following characteristic function：
Wherein
α (0 ＜ α≤2) is characterized index, and γ is the coefficient of dispersion, and β is symmetric parameter, and ζ is location parameter.When ζ=0, β=0
And during γ=1, the distribution is referred to as standard S α S distributions；
The fractional lower-order ambiguity function of digital modulation signals x (t) is expressed as：
Wherein, τ is delay skew, and f is Doppler frequency shift, 0 ＜ a, b ＜ α/2.x*T () represents the conjugation of x (t).As x (t)
For real signal when, x (t)＜ p ＞=| x (t) |＜ p ＞sgn(x(t))；When x (t) be time multiplexed signal, [x (t)]＜ p ＞=| x (t) |p-1x*
T (), the nonlinear operation only change the amplitude information of signal, retain its frequency and phase information, effective impulse noise mitigation.
Height degree of the immersing Head-mounted display control system that the present invention is provided, 360 degree of panoramic viewing angles can follow user synchronously to turn
Dynamic.In the scene that user places oneself in the midst of virtuality, therefore virtual reality is typically, and Consumer's Experience should be 360 degree of panoramas without dead angle.
When user is turned round in virtual scene or during rotary head, the orientation that Helmet Mounted Display is calculated by gyro and geomagnetic sensor, from
And change user visual angle in the scene, improve the feeling of immersion of user and interactive.
Description of the drawings
Fig. 1 is height degree of immersing Head-mounted display control system architecture schematic diagram provided in an embodiment of the present invention；
In figure：1st, central processing unit；2nd, 3D processing modules；3rd, video module；4th, FPGA module；5、SDRAM；6th, digital-to-analogue turns
Mold changing block；7th, display module.
Specific embodiment
In order that the objects, technical solutions and advantages of the present invention become more apparent, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that specific embodiment described herein is not used to only in order to explain the present invention
Limit the present invention.
Below in conjunction with the accompanying drawings the application principle of the present invention is explained in detail.
As shown in figure 1, height degree of immersing Head-mounted display control system provided in an embodiment of the present invention includes：Central processing unit
1st, 3D processing modules 2, video module 3, FPGA module 4, SDRAM 5, D/A converter module 6, display module 7.
Central processing unit 1, for assisting FPGA module 4 to carry out the process of image information.
3D processing modules 2, for carrying out 3D process to image；
Video module 3, for input video information.
FPGA module 4, with central processing unit 1,3D processing modules 2, the 5 wireless connection of video module 3 and SDRAM；For reality
Existing 3D processing modules 2, the video information between video module 3 and D/A converter module 6 are exchanged.
SDRAM 5, for realizing that video information freely specifies address to be written and read.
D/A converter module 6, with 4 wired connection of FPGA module；For realizing the digital-to-analogue conversion of video system.
Display module 7, with 6 wired connection of D/A converter module；Video information for logarithmic mode conversion is shown.
Further, the central processing unit is provided with energy detection module, the energy measuring side of the energy detection module
Method includes：
The first step, the FFT that the radio frequency in Reived_V1 or Reived_V2 or if sampling signal are carried out NFFT points
Computing, then modulus computing are stored in front NFFT/2 point therein in VectorF, save the width of signal x2 in VectorF
Degree spectrum；
Second step, is the equal Block, N=3,4 of N blocks by analysis bandwidth Bs point ... .., each Block will be carried out
The a width of Bs/N of the band of computing, if the low-limit frequency that will analyze bandwidth Bs is FL, FL=0 here, then block nBlock, n=1...N,
Corresponding frequency separation scope is [FL+ (n-1) Bs/N, FL+ (n) Bs/N] respectively, by the frequency of corresponding frequency range in VectorF
Rate point distributes to each block, and the VectorF point ranges that wherein nBlock divides are [Sn, Sn+kn], whereinThe number of per section of Frequency point that gets is represented, and
Represented is starting point, and fs is signal sampling frequencies, and round (*) represents the computing that rounds up；
3rd step, seeks the energy Σ of its frequency spectrum to each Block | | 2, obtain E (n), n=1...N；
4th step, averages to vectorial E
5th step, try to achieve vectorial E variance and
6th step, updates flag bit flag, flag=0, represents that a front testing result is no signal, this kind of under the conditions of,
Only work as σsum>It is judged to during K2 that currently detected signal, flag are changed into 1；Work as flag=1, represent that a front testing result is have
Signal, this kind of under the conditions of, only as σ sum<It is judged to currently be not detected by signal during K1, flag is changed into 0, K1 and K2 for thresholding
Value, is given from empirical value with theoretical simulation, K2>K1；
According to flag bit, 7th step, controls whether subsequent demodulation thread etc. is opened：Flag=1, opens subsequent demodulation thread
Deng, otherwise close subsequent demodulation thread.
Further, the video module overlaps the diagonal slices of MASK signal of change cyclic bispectrums to the time-frequency for receiving
Spectrum, and intercept and be carried out as follows in the section of f=0：
Time-frequency overlaps the signal model of MASK and is expressed as：
Wherein, component of signal numbers of the N for time-frequency overlapped signal, n (t) is additive white Gaussian noise, siT () is time-frequency weight
The component of signal of folded signal, is expressed asA in formulaiRepresent signal point
The amplitude of amount, aiM () represents that the symbol of component of signal, p (t) represent molding filter function, TiRepresent the code element of component of signal
Cycle, fciThe carrier frequency of component of signal is represented,Represent the phase place of component of signal；
The diagonal slice spectrum of the cyclic bispectrum of MASK signals is expressed as：
Wherein, y (t) represents MASK signals, and α is the cycle frequency of y (t), fcThe carrier frequency of signal is represented, T is signal
Code-element period, k is integer,Ca,3The Third-order cumulants of random sequences a are represented, δ () is impulse function, P (f)
It is molding impulse function, expression formula is：
F=0 sections are taken to the diagonal slice spectrum of cyclic bispectrum to obtain：
The diagonal slice spectrum of cyclic bispectrum meets linear superposition, then time-frequency overlaps the cutting on the cross of MASK signal cycle bispectrums
Piece spectrum expression formula be：
Wherein,It is constant, T relevant with the modulation system of i-th component of signaliIt is the code element week of i-th component of signal
Phase；
Which is intercepted in the section of f=0：
For when frequency aliasing signal cyclic bispectrum diagonal slice spectrum f=0, in α=fcThere is peak value in place, and carry letter
Number carrier frequency information.
Further, the video module is provided with digital modulation signals computing unit；The digital modulation signals unit meter
The fractional lower-order ambiguity function for calculating digital modulation signals is carried out according to the following steps：
Receive signal y (t) to be expressed as：
Y (t)=x (t)+n (t)
Wherein, x (t) is digital modulation signals, and n (t) is the impulsive noise of obedience standard S α S distributions.For MASK and
MPSK is modulated, and the analytical form of x (t) is expressed as：
Wherein, N is sampling number, anFor the information symbol for sending, in MASK signals, an=0,1,2 ..., M-1, M are
Order of modulation, in mpsk signal, an=ej2πε/M, ε=0,1,2 ..., M-1, g (t) represent rectangle molding pulse, TbRepresent symbol
Number cycle, fcRepresent carrier frequency, carrier wave initial phaseIt is equally distributed random number in [0,2 π].Adjust for MFSK
System, the analytical form of x (t) are expressed as：
Wherein, fmFor the side-play amount of m-th carrier frequency, if MFSK signals carrier shift is Δ f, fm=-(M-1) Δ f ,-
(M-3) Δ f ..., (M-3) Δ f, (M-1) Δ f, carrier wave initial phaseIt is equally distributed random number in [0,2 π].
Its distribution character is described with following characteristic function：
Wherein
α (0 ＜ α≤2) is characterized index, and γ is the coefficient of dispersion, and β is symmetric parameter, and ζ is location parameter.When ζ=0, β=0
And during γ=1, the distribution is referred to as standard S α S distributions；
The fractional lower-order ambiguity function of digital modulation signals x (t) is expressed as：
Wherein, τ is delay skew, and f is Doppler frequency shift, 0 ＜ a, b ＜ α/2.x*T () represents the conjugation of x (t).As x (t)
For real signal when, x (t)＜ p ＞=| x (t) |＜ p ＞sgn(x(t))；When x (t) be time multiplexed signal, [x (t)]＜ p ＞=| x (t) |p-1x*
T (), the nonlinear operation only change the amplitude information of signal, retain its frequency and phase information, effective impulse noise mitigation.
Presently preferred embodiments of the present invention is the foregoing is only, not in order to limit the present invention, all in essence of the invention
Any modification, equivalent and improvement that is made within god and principle etc., should be included within the scope of the present invention.
Claims (4)
1. a kind of height degree of immersing Head-mounted display, it is characterised in that height degree of the immersing Head-mounted display includes：
Central processing unit, for assisting FPGA module to carry out the process of image information；
3D processing modules, for carrying out 3D process to image；
Video module, for input video information；
FPGA module, is wirelessly connected with central processing unit, 3D processing modules, video module and SDRAM；For realizing that 3D processes mould
Video information between block, video module and D/A converter module is exchanged；
SDRAM, for realizing that video information freely specifies address to be written and read；
D/A converter module, with FPGA module wired connection；For realizing the digital-to-analogue conversion of video system；
Display module, with D/A converter module wired connection；Video information for logarithmic mode conversion is shown.
2. height degree of immersing Head-mounted display as claimed in claim 1, it is characterised in that the central processing unit is provided with energy
Detection module, the energy detection method of the energy detection module include：
The first step, the FFT computings that the radio frequency in Reived_V1 or Reived_V2 or if sampling signal are carried out NFFT points,
Then modulus computing, front NFFT/2 point therein is stored in VectorF, the amplitude spectrum of signal x2 is saved in VectorF；
Second step, is the equal Block, N=3,4 of N blocks by analysis bandwidth Bs point ... .., each Block will carry out computing
The a width of Bs/N of band, if the low-limit frequency that will analyze bandwidth Bs is FL, FL=0 here, then block nBlock, n=1...N, institute are right
The frequency separation scope that answers is [FL+ (n-1) Bs/N, FL+ (n) Bs/N] respectively, by the Frequency point of corresponding frequency range in VectorF
Each block is distributed to, the VectorF point ranges that wherein nBlock divides are [Sn, Sn+kn], whereinThe number of per section of Frequency point that gets is represented, and
Represented is starting point, and fs is signal sampling frequencies, and round (*) represents the computing that rounds up；
3rd step, seeks the energy Σ of its frequency spectrum to each Block | | 2, obtain E (n), n=1...N；
4th step, averages to vectorial E
5th step, try to achieve vectorial E variance and
6th step, updates flag bit flag, flag=0, represents that a front testing result is no signal, this kind of under the conditions of, only
Work as σsum>It is judged to during K2 that currently detected signal, flag are changed into 1；Work as flag=1, represent that a front testing result is have letter
Number, this kind of under the conditions of, only as σ sum<It is judged to currently be not detected by signal during K1, flag is changed into 0, K1 and K2 for threshold value,
Be given from empirical value with theoretical simulation, K2>K1；
According to flag bit, 7th step, controls whether subsequent demodulation thread etc. is opened：Flag=1, opens subsequent demodulation thread etc., no
Subsequent demodulation thread is then closed.
3. height degree of immersing Head-mounted display as claimed in claim 1, it is characterised in that the video module to receive when
Frequency overlaps the diagonal slice spectrum of MASK signal of change cyclic bispectrums, and intercepts and be carried out as follows in the section of f=0：
Time-frequency overlaps the signal model of MASK and is expressed as：
Wherein, component of signal numbers of the N for time-frequency overlapped signal, n (t) is additive white Gaussian noise, siT () is that time-frequency overlaps letter
Number component of signal, be expressed asA in formulaiRepresent component of signal
Amplitude, aiM () represents that the symbol of component of signal, p (t) represent molding filter function, TiRepresent the code element week of component of signal
Phase, fciThe carrier frequency of component of signal is represented,Represent the phase place of component of signal；
The diagonal slice spectrum of the cyclic bispectrum of MASK signals is expressed as：
Wherein, y (t) represents MASK signals, and α is the cycle frequency of y (t), fcThe carrier frequency of signal is represented, T is the code element of signal
Cycle, k are integer,Ca,3The Third-order cumulants of random sequences a are represented, δ () is impulse function, and P (f) is molding
Impulse function, expression formula is：
F=0 sections are taken to the diagonal slice spectrum of cyclic bispectrum to obtain：
The diagonal slice spectrum of cyclic bispectrum meets linear superposition, then time-frequency overlaps the diagonal slice spectrum of MASK signal cycle bispectrums
Expression formula be：
Wherein,It is constant, T relevant with the modulation system of i-th component of signaliIt is the code-element period of i-th component of signal；
Which is intercepted in the section of f=0：
For when frequency aliasing signal cyclic bispectrum diagonal slice spectrum f=0, in α=fcThere is peak value in place, and carry signal
Carrier frequency information.
4. height degree of immersing Head-mounted display as claimed in claim 1, it is characterised in that the video module is provided with digital tune
Signature computation unit processed；The digital modulation signals unit calculates the fractional lower-order ambiguity function of digital modulation signals and presses following step
Suddenly carry out：
Receive signal y (t) to be expressed as：
Y (t)=x (t)+n (t)
Wherein, x (t) is digital modulation signals, and n (t) is the impulsive noise of obedience standard S α S distributions；Adjust for MASK and MPSK
System, the analytical form of x (t) are expressed as：
Wherein, N is sampling number, anFor the information symbol for sending, in MASK signals, an=0,1,2 ..., M-1, M are modulation
Exponent number, in mpsk signal, an=ej2πε/M, ε=0,1,2 ..., M-1, g (t) represent rectangle molding pulse, TbRepresent symbol week
Phase, fcRepresent carrier frequency, carrier wave initial phaseIt is equally distributed random number in [0,2 π]；Modulate for MFSK, x
T the analytical form of () is expressed as：
Wherein, fmFor the side-play amount of m-th carrier frequency, if MFSK signals carrier shift is Δ f, fm=-(M-1) Δ f ,-(M-3)
Δ f ..., (M-3) Δ f, (M-1) Δ f, carrier wave initial phaseIt is equally distributed random number in [0,2 π]；
Its distribution character is described with following characteristic function：
WhereinFor sign function,
α (0 ＜ α≤2) is characterized index, and γ is the coefficient of dispersion, and β is symmetric parameter, and ζ is location parameter；As ζ=0, β=0 and γ
When=1, the distribution is referred to as standard S α S distributions；
The fractional lower-order ambiguity function of digital modulation signals x (t) is expressed as：
Wherein, τ is delay skew, and f is Doppler frequency shift, 0 ＜ a, b ＜ α/2；x*T () represents the conjugation of x (t)；When x (t) is real
During signal, x (t)＜ p ＞=| x (t) |＜ p ＞sgn(x(t))；When x (t) be time multiplexed signal, [x (t)]＜ p ＞=| x (t) |p-1x*(t),
The nonlinear operation only changes the amplitude information of signal, retains its frequency and phase information, effective impulse noise mitigation.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102593A (en) * | 2017-06-21 | 2017-08-29 | 武汉万千无限科技有限公司 | A kind of intelligent remote video monitoring control system based on computer internet technology |
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