CN109696188B - Rotation delay measuring method of VR helmet based on laser tube - Google Patents
Rotation delay measuring method of VR helmet based on laser tube Download PDFInfo
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- CN109696188B CN109696188B CN201811636622.8A CN201811636622A CN109696188B CN 109696188 B CN109696188 B CN 109696188B CN 201811636622 A CN201811636622 A CN 201811636622A CN 109696188 B CN109696188 B CN 109696188B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01D—MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR
- G01D5/00—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable
- G01D5/12—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means
- G01D5/244—Mechanical means for transferring the output of a sensing member; Means for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for converting; Transducers not specially adapted for a specific variable using electric or magnetic means influencing characteristics of pulses or pulse trains; generating pulses or pulse trains
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/26—Measuring arrangements characterised by the use of optical techniques for measuring angles or tapers; for testing the alignment of axes
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Abstract
The invention provides a rotation delay measuring method of a VR helmet based on a laser tube, which adopts a turntable to drive the VR helmet to rotate; all the laser tubes and the rotary table are concentric and arranged in a circle at equal intervals to carry out binary coding values; in the movement process of the VR helmet, the rotation angle of each laser tube is recorded, when the VR helmet moves again and senses the angle of the laser tube, the corresponding black-and-white image is correspondingly input to the VR helmet according to the binary code of the laser tube, and the black-and-white image is sensed by another photosensitive sensor; obtaining the delay time of the VR helmet according to a square wave curve output by the pulse of the laser tube and a square wave curve output by the photosensitive sensor when sensing a black-white image; the method enables the black and white patterns in the VR helmet to be registered with the optical codes in a virtual and real mode, errors caused by manual alignment of waveforms in an early method are avoided, and the expectation of data is closer to the real delay time.
Description
Technical Field
The invention belongs to the technical field of virtual reality equipment, and particularly relates to a rotation delay measuring method of a VR helmet based on a laser tube.
Background
The document L uca M d.new Method to Measure End-to-End Delay of VR helmet, which may cause "motion sickness" if slightly longer, "proposes a simple solution for Delay measurement, as shown in fig. 1(a), in which a light-sensitive sensor is fixed on each of the VR helmet shell and the window, a gray-scale gradual test pattern is displayed in both the display and VR helmet, and then the light-sensitive sensor on the shell is pressed against the display, the VR helmet is pressed against the display and moved back and forth along the gray-scale change direction, the waveforms returned by the two sensors are recorded (fig. 1(b)), the Delay time of the VR helmet is obtained by calculating the phase difference between the two waveforms, the Method has the disadvantages that the need of manual movement, the Delay time of the VR helmet during movement, etc. can introduce much noise to the signal processing, the Method of manually aligning the frequency domain waveforms, the good phase difference between the two waveforms in the movement, and the Delay time of the VR helmet is determined by the virtual pattern display, and the Method can not only rely on the fact that the virtual Delay time variation of VR helmet is not easily determined by the visual instability of the VR helmet.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a method for measuring a rotation delay of a VR headset based on a laser tube, which can accurately measure the rotation delay of the VR headset by using a simple device.
A rotation delay measuring method of a VR helmet based on a laser tube uses a measuring device which comprises a first photosensitive sensor (1), the VR helmet (2), an object stage (3), a rotary table (4), a controller (5), the laser tube (6), a second photosensitive sensor (7) and an upper computer;
the object stage (3) is fixed on a central rotating shaft extending out of the rotary table (4), the rotary table (4) is controlled by the controller (5) to rotate, and the VR helmet (2) can be driven by the object stage (3) to rotate coaxially with the rotary table (4); the second photosensitive sensor (7) is fixed on a display window of the VR helmet (2) and used for sensing the color of the pattern displayed by the VR helmet (2); the first photosensitive sensor (1) is fixed on the objective table (3), and a photosensitive head faces downwards; a plurality of laser tubes (6) are supported and fixed below the objective table (3) by a support, all the laser tubes (6) and the rotary table (4) are concentric and are arranged on a circumference at equal intervals, and when the first photosensitive sensor (1) rotates along with the objective table (3), the first photosensitive sensor can be sequentially aligned with each laser tube (6) and receives laser signals emitted by the laser tubes; each laser tube (6) is sequentially endowed with binary coding values of 1 and 0, namely, the coding values of 1 and 0 are spaced corresponding to each laser tube (6);
the rotation delay measuring method comprises the following specific steps:
and 5, controlling the VR helmet (2) to display a corresponding black-and-white picture by the upper computer according to the coded rotation angle data set and by combining the current rotation angle information of the upper computer calculated by the VR helmet (2), namely: when the code corresponding to the calculated rotation angle is 1, outputting a white pattern to the VR helmet (2) and continuing until the next code rotation angle; when the code corresponding to the calculated rotation angle is 0, outputting a black pattern to the VR helmet (2) and continuing until the next code rotation angle; in the process, the photosensitive sensor (1) senses a black-white image output by the lens of the VR helmet (2), when the white image is sensed, the photosensitive sensor (1) returns to a high level, and when the black image is sensed, the photosensitive sensor (1) returns to a low level, so that a square wave curve is obtained and defined as a detection waveform;
and 7, calculating the time delay delta t of the detected waveform relative to the reference waveform, namely the time delay of the VR helmet (2).
Furthermore, the VR helmet (2) is rotated for a plurality of circles to obtain more waveform data, time delay delta t is respectively obtained, and the average value of the time delay delta t is the accurate time delay of the VR helmet (2).
The invention has the following beneficial effects:
the invention provides a rotation delay measuring method of a VR helmet based on a laser tube, which adopts a turntable to drive the VR helmet to rotate; all the laser tubes and the rotary table are concentric and arranged in a circle at equal intervals to carry out binary coding values; in the movement process of the VR helmet, the rotation angle of each laser tube is recorded, when the VR helmet moves again and senses the angle of the laser tube, the corresponding black-and-white image is correspondingly input to the VR helmet according to the binary code of the laser tube, and the black-and-white image is sensed by another photosensitive sensor; obtaining the delay time of the VR helmet according to a square wave curve output by the pulse of the laser tube and a square wave curve output by the photosensitive sensor when sensing a black-white image; the method enables the black and white patterns in the VR helmet to be registered with the optical codes in a virtual and real mode, errors caused by manual alignment of waveforms in an early method are avoided, and the expectation of data is closer to the real delay time.
Drawings
Fig. 1(a) is a diagram of a conventional experimental apparatus for measuring VR headset movement delay;
FIG. 1(b) is a graph of experimental signals obtained based on the experimental set-up of FIG. 1 (a);
FIG. 2 is a schematic view of a measuring device according to the present invention;
FIG. 3 is a schematic view of the installation of a VR helmet and a light sensor in accordance with the present invention;
FIG. 4 is a schematic diagram of the encoding of a laser tube according to the present invention;
FIG. 5 is a diagram of a detection waveform and a reference waveform obtained when the turntable rotates one turn;
the system comprises a first photosensitive sensor 1, a head-mounted display device 2, an object stage 3, a turntable 4, a controller 5, a laser tube 6 and a second photosensitive sensor 7.
Detailed Description
The invention is described in detail below by way of example with reference to the accompanying drawings.
The invention discloses a rotation delay measuring method of a VR helmet based on a laser tube, and a measuring device used in the method is shown in figure 2 and comprises a first photosensitive sensor 1, a head-mounted display device 2, an object stage 3, a rotary table 4, a controller 5, a laser tube 6, a second photosensitive sensor 7 and an upper computer.
The object stage 3 is fixed on a central rotating shaft extending out of the rotary table 4, the rotary table 4 is controlled by the controller 5 to rotate, and the VR helmet 2 can be driven by the object stage 3 to rotate coaxially with the rotary table 4; as shown in fig. 3, a second photosensor 7 is fixed on the display window of the VR headset 2 for sensing the color of the pattern displayed by the VR headset 2. The first photosensitive sensor 1 is fixed on the objective table 3, and the photosensitive head faces downwards; the laser tubes 6 are supported and fixed below the object stage 3 by the support, all the laser tubes 6 and the rotary table 4 are concentric and arranged on a circumference at equal intervals, and when the first photosensitive sensor 1 rotates along with the object stage 3, the laser tubes 6 can be sequentially aligned and receive laser signals emitted by the laser tubes. As shown in FIG. 4, each laser tube 6 is assigned a binary coded value of 1 and 0 in turn, i.e., coded values of 1 and 0 are spaced for each laser tube 6.
The rotation delay measuring method comprises the following specific steps:
1. firstly, controlling the turntable 4 to move at a constant speed for one circle from an initial position (the position of any laser tube 6), and calculating the self-rotation angle at any time without inputting an image into the VR helmet 2;
2. in the rotation process of the object stage 3, at the moment when the first photosensitive sensor 1 receives signals of each laser tube 6, the VR helmet 2 calculates the rotation angle of the VR helmet at each moment; wherein, according to the code value that each laser pipe 6 corresponds, encode VR helmet 2 self turned angle, promptly: when a signal of the laser tube 6 coded as 1 is received, the rotation angle of the VR helmet 2 is coded as 1; otherwise, the rotation angle is coded to be 0;
3. after the rotary table finishes one circle of rotation, a group of encoded rotation angle data sets of the VR helmet 2 is finally obtained;
4. then the object stage 3 is controlled to move from the zero point again, and simultaneously, the data returned by the first photosensitive sensor 1 and the second photosensitive sensor 7 are recorded;
5. the host computer combines the current turned angle information of self that VR helmet 2 calculated according to the coding turned angle data set, and control VR helmet 2 shows corresponding black and white picture, promptly: when the code corresponding to the calculated rotation angle is 1, outputting a white pattern to the VR helmet 2 and continuing until the next code rotation angle; when the code corresponding to the calculated rotation angle is 0, outputting a black pattern to the VR helmet 2 and continuing until the next code rotation angle; the photosensitive sensor 1 thereon senses the black and white image output by the lens of the VR helmet 2 in the process, when the white image is sensed, the photosensitive sensor 1 returns to the high level, and when the black image is sensed, the photosensitive sensor 1 returns to the low level, thereby obtaining a square wave curve defined as a detection waveform, as shown in fig. 5;
6. meanwhile, a group of pulse signals are generated by signals detected by the first photosensitive sensor 1, a group of square wave signals are generated by the upper computer according to the corresponding coding value of the laser tube 6, and the generation rule is as follows: when the laser emission 6 corresponding to the pulse is coded as 1, outputting a high level and continuing until the next pulse is detected; when the laser burst 6 corresponding to the pulse is coded to 0, a low level is output and continues until the next pulse is detected, thereby obtaining a set of square wave signals, which are called reference waveforms.
7. Data processing: since there is a time delay in the perception of the VR headset 2, when the stage 3 is rotated to a certain position, the VR headset 2 cannot immediately perceive the position, and there is a time delay, therefore, as shown in fig. 5, the detected waveform will have a time delay Δ t relative to the reference waveform; therefore, calculating the time delay Δ t yields the movement delay of the VR headset 2. By averaging the multiple time delays Δ t on the detected waveform and the reference waveform, a more accurate movement delay of the VR headset 2 can be obtained.
In order to increase the data amount of multiple averaging and obtain more accurate measurement values, the VR headset 2 should be rotated several turns to obtain more waveform data, and respectively obtain Δ T, and the average value is the delay time T of the device.
In summary, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (2)
1. A rotation delay measuring method of a VR helmet based on a laser tube is characterized in that a used measuring device comprises a first photosensitive sensor (1), the VR helmet (2), an object stage (3), a rotary table (4), a controller (5), the laser tube (6), a second photosensitive sensor (7) and an upper computer;
the object stage (3) is fixed on a central rotating shaft extending out of the rotary table (4), the rotary table (4) is controlled by the controller (5) to rotate, and the VR helmet (2) can be driven by the object stage (3) to rotate coaxially with the rotary table (4); the second photosensitive sensor (7) is fixed on a display window of the VR helmet (2) and used for sensing the color of the pattern displayed by the VR helmet (2); the first photosensitive sensor (1) is fixed on the objective table (3), and a photosensitive head faces downwards; a plurality of laser tubes (6) are supported and fixed below the objective table (3) by a support, all the laser tubes (6) and the rotary table (4) are concentric and are arranged on a circumference at equal intervals, and when the first photosensitive sensor (1) rotates along with the objective table (3), the first photosensitive sensor can be sequentially aligned with each laser tube (6) and receives laser signals emitted by the laser tubes; each laser tube (6) is sequentially endowed with binary coding values of 1 and 0, namely, the coding values of 1 and 0 are spaced corresponding to each laser tube (6);
the rotation delay measuring method comprises the following specific steps:
step 1, firstly, controlling a rotary table (4) to move at a constant speed for a circle from an initial position, and constantly calculating the rotation angle of a VR helmet (2);
step 2, in the rotation process of the object stage (3), at the moment when the first photosensitive sensor (1) receives signals of the laser tubes (6), the VR helmet (2) calculates the rotation angle of the VR helmet at each moment; wherein, according to the code value that each laser pipe (6) correspond, encode VR helmet (2) self turned angle, promptly: when a laser tube (6) signal coded as 1 is received, the rotation angle of the VR helmet (2) is coded as 1; otherwise, the rotation angle is coded to be 0;
step 3, finally obtaining a group of coded rotation angle data sets of the VR helmet (2) after the rotary table completes one circle of rotation;
step 4, controlling the object stage (3) to move from the zero point again, calculating the rotation angle of the VR helmet (2) at any moment, and simultaneously recording data returned by the first photosensitive sensor (1) and the second photosensitive sensor (7) by the upper computer;
and 5, controlling the VR helmet (2) to display a corresponding black-and-white picture by the upper computer according to the coded rotation angle data set and by combining the current rotation angle information of the upper computer calculated by the VR helmet (2), namely: when the code corresponding to the calculated rotation angle is 1, outputting a white pattern to the VR helmet (2) and continuing until the next code rotation angle; when the code corresponding to the calculated rotation angle is 0, outputting a black pattern to the VR helmet (2) and continuing until the next code rotation angle; in the process, the first photosensitive sensor (1) senses a black-white image output by the lens of the VR helmet (2), when the white image is sensed, the first photosensitive sensor (1) returns to a high level, and when the black image is sensed, the first photosensitive sensor (1) returns to a low level, so that a square wave curve is obtained and defined as a detection waveform;
step 6, simultaneously, a group of pulse signals are generated by signals detected by the first photosensitive sensor (1), the upper computer generates a group of square wave signals according to the corresponding code value of the laser tube (6), and the generation rule is as follows: when the laser tube (6) corresponding to the pulse is coded as 1, outputting a high level and continuing until the next pulse is detected; when the laser tube (6) corresponding to the pulse is coded to be 0, outputting low level and continuing until the next pulse is detected, thereby obtaining a group of square wave signals called as reference waveforms;
and 7, calculating the time delay delta t of the detected waveform relative to the reference waveform, namely the time delay of the VR helmet (2).
2. The method for measuring the rotation delay of the VR helmet based on the laser tube as claimed in claim 1, wherein the VR helmet (2) is rotated for several turns to obtain more waveform data, and the time delay Δ t is obtained respectively, and the average value of the time delay Δ t is the accurate time delay of the VR helmet (2).
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| JP2006171637A (en) * | 2004-12-20 | 2006-06-29 | Canon Inc | Head-mounted video display apparatus |
| US10018847B2 (en) * | 2015-10-28 | 2018-07-10 | Honeywell International Inc. | Methods of vestibulo-ocular reflex correction in display systems |
| EP3376772B1 (en) * | 2015-11-12 | 2023-01-25 | Panasonic Intellectual Property Corporation of America | Display method, program and display device |
| CN105807602A (en) * | 2016-03-10 | 2016-07-27 | 北京小鸟看看科技有限公司 | Method and system for testing virtual reality equipment delay |
| CN105807601A (en) * | 2016-03-10 | 2016-07-27 | 北京小鸟看看科技有限公司 | Method and system for testing virtual reality equipment delay |
| CN105954007B (en) * | 2016-05-18 | 2018-10-02 | 杭州映墨科技有限公司 | Delay test system and method for virtual implementing helmet acceleration movement |
| CN107687932B (en) * | 2016-08-05 | 2020-08-04 | 成都理想境界科技有限公司 | Method and device for detecting delay of head-mounted display equipment |
| CN106325517A (en) * | 2016-08-29 | 2017-01-11 | 袁超 | Target object trigger method and system and wearable equipment based on virtual reality |
| US10565916B2 (en) * | 2016-09-09 | 2020-02-18 | Kt Corporation | Providing streaming of virtual reality contents |
| CN106644396B (en) * | 2016-12-16 | 2019-06-25 | 捷开通讯(深圳)有限公司 | The detection device and detection method of the delay time of VR glasses |
| US9807384B1 (en) * | 2017-01-13 | 2017-10-31 | Optofidelity Oy | Method, apparatus and computer program product for testing a display |
| CN106951370B (en) * | 2017-03-17 | 2021-01-26 | 深圳普瑞赛思检测技术有限公司 | Evaluation method and device for virtual reality equipment program running delay |
| CN107423212B (en) * | 2017-03-17 | 2020-12-01 | 深圳普瑞赛思检测技术有限公司 | Method and device for evaluating response delay of screen of virtual reality equipment |
| CN207248488U (en) * | 2017-10-18 | 2018-04-17 | 宁波神州泰岳锐智信息科技有限公司 | For testing the revolution speed control device of VR equipment delay |
| CN107820075A (en) * | 2017-11-27 | 2018-03-20 | 中国计量大学 | A kind of VR equipment delayed test devices based on light stream camera |
| CN208156648U (en) * | 2018-02-11 | 2018-11-27 | 深圳创维新世界科技有限公司 | Time delay measurement instrument |
| CN108283793B (en) * | 2018-03-10 | 2023-08-01 | 杭州虚现科技股份有限公司 | Omnidirectional mobile platform and method for accurately tracking bipedal information based on omnidirectional mobile platform |
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