VR head-mounted display interpupillary distance calibration method and calibration equipment

Abstract

The invention relates to a VR head-mounted display interpupillary distance calibration method and calibration equipment, and the method comprises the steps: fixing a VR head-mounted display at a calibration position, carrying out the adjustment from the minimum interpupillary distance to the maximum interpupillary distance, recording the focusing position information in the interpupillary distance adjustment process, and obtaining an interpupillary distance calibration function based on all the focusing position information, thereby adjusting the interpupillary distance of the VR head-mounted display. According to the equipment, a VR head-mounted display is placed on a fixing tool base, a pupil distance adjusting mechanism is arranged on the fixing tool base, and two cameras used for collecting adjusting images and two visual channels corresponding to the head-mounted display are arranged in the fixing tool base; and the control end acquires an image acquired by the camera and performs pupil distance calibration by adopting a VR head-mounted display pupil distance calibration method. According to the invention, the pupil distance of the VR head-mounted display of the same model can be calibrated, the user experience is better met, the manpower and time for calibration are greatly saved, the calibration efficiency is improved, the calibration effect is improved, errors generated during head-mounted display assembly and errors generated by components of the head-mounted display are eliminated, and the pupil distance information of the head-mounted display is accurately obtained.

Description

Technical Field

[0001] The present invention relates to the technical field of calculation, extrapolation and counting, and in particular to a method and device for calibrating pupil distance of a VR head display. Background Art

[0002] With the rapid development of the leisure and entertainment industry, many terminal simulators for virtual reality environments have emerged to meet users' needs for a stronger sense of control and immersion.

[0003] VR headsets use head-mounted display devices to block people's vision and hearing to the outside world, guiding users to create a feeling of being in a virtual environment. The display principle is that the left and right eye screens display the left and right eye images respectively. After the human eye obtains this different information, a sense of three-dimensionality is created in the mind.

[0004] Even in real life, when both eyes look at an object, there are slight differences between the images seen by the left and right eyes. Only after integration by the visual center of the brain can a complete, physical object be formed. However, the VR imaging process does not have the integration capabilities of the human eye and brain. Only when the pupil center, lens center and screen (after split screen) center of both eyes are in a straight line can a clear picture be seen. If the three are not in the same straight line, the parallax is too large. At this time, the images of both eyes and the screen overlap, which will cause ghosting. In severe cases, the user will experience physical discomfort.

[0005] Therefore, adjusting the interpupillary distance is an important step before using a VR headset. However, considering the above reasons, if the adjusted interpupillary distance does not match the actual interpupillary distance, the goal of adjusting the interpupillary distance cannot be achieved. In the prior art, for VR headsets with adjustable interpupillary distance, users generally report that the actual interpupillary distance (IPD) does not match the displayed IPD, and the error is large, which affects the user experience. Summary of the invention

[0006] The present invention solves the problems existing in the prior art and provides a VR head display pupil distance calibration method and calibration device.

[0007] The technical solution adopted by the present invention is a method for calibrating the pupil distance of a VR headset. The method fixes the VR headset at a calibration position, starts adjusting the pupil distance from the minimum to the maximum, records the focus position information during the pupil distance adjustment process, obtains the pupil distance calibration function based on all the focus position information; and adjusts the pupil distance of the VR headset based on the pupil distance calibration function.

[0008] Preferably, the method comprises the following steps: S1 After adjusting the interpupillary distance of the VR headset to the minimum position, fix it in the calibration position; S2: In the calibration position, aim a camera at the lens on the corresponding side of the VR headset and adjust it to be stable; S3 starts from the minimum pupil distance and adjusts the pupil distance based on the preset conditions until the pupil distance is maximized, and records the focus position information during the process; S4 corresponds to each adjustment of S3 to obtain the measured pupil distance; S5 collects coordinate information of all focus position information, and obtains displacement of the focus position information with the minimum pupil distance; S6 combines the information of S4 and S5 to obtain the pupil distance calibration function; S7 corrects the pupil distance of the VR headset to be calibrated based on the pupil distance calibration function.

[0009] Preferably, two dark box channels that do not interfere with each other are arranged in the calibration position; in S2, any VR lens is downwardly aligned with a dark box channel, and a camera is arranged at the other end of the dark box channel, and the exposure time of the camera is adjusted until the image is stable.

[0010] Preferably, in S3, the interpupillary distance after each adjustment is 0.5 mm larger than that of the previous adjustment.

[0011] Preferably, in S6, origin is used to perform linear fitting on the displacement of the measured pupil distance and the focus position information.

[0012] Preferably, the displacement of the measured pupil distance and focus position information of multiple VR head displays with the same parameters is repeatedly measured and the average is taken, and a linear fit is performed on the average.

[0013] Preferably, in S7, the pupil distance of the VR headset to be calibrated is adjusted to the minimum, the coordinate information of the focus position information at this time is obtained, the final pupil distance is obtained according to the change in the coordinate distance, the initial pupil distance of the VR headset to be calibrated is calibrated, and the precise pupil distance is obtained after the knob is adjusted.

[0014] A VR head display pupil distance calibration device, the calibration device comprising: A fixed tooling base, used to place a VR head display; the fixed tooling base is provided with an interpupillary distance adjustment mechanism; Two cameras, installed in the fixed tooling base, corresponding to the two visual channels of the VR headset, are used to collect and adjust images; A control terminal is used to obtain images captured by the camera and calibrate the pupil distance using the VR head display pupil distance calibration method.

[0015] Preferably, the field of view angle of the camera lens is greater than the field of view of the VR lens.

[0016] Preferably, a pressure plate is provided on the top of the fixed tooling base for pressurizing the VR head display placed on the fixed tooling base, and an air pump is provided on the pressure plate.

[0017] The present invention relates to a VR head display interpupillary distance calibration method and calibration equipment. The method fixes the VR head display at a calibration position, starts adjusting the interpupillary distance from the minimum to the maximum, records the focus position information during the interpupillary distance adjustment process, obtains the interpupillary distance calibration function based on all the focus position information; adjusts the interpupillary distance of the VR head display based on the interpupillary distance calibration function; the device places the VR head display on a fixed tooling base, is provided with an interpupillary distance adjustment mechanism on the fixed tooling base, and is provided with two cameras in the fixed tooling base, corresponding to two visual channels of the VR head display, for collecting and adjusting images; a control end is used to obtain the image collected by the camera and use the VR head display interpupillary distance calibration method to perform interpupillary distance calibration.

[0018] The beneficial effects of the present invention are that the pupil distance of the same model of VR head display can be calibrated more accurately, which better meets the user experience, greatly saves manpower and time used for calibration, improves calibration efficiency, improves calibration effect, can eliminate errors generated during assembly of the head display and errors generated by the components of the head display itself, and obtains the pupil distance information of the head display more accurately. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a flow chart of the method of the present invention; Figure 2 It is a schematic diagram of the device structure of the present invention. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below in conjunction with embodiments, but the protection scope of the present invention is not limited thereto.

[0021] The present invention relates to a VR head display pupil distance calibration device, the calibration device comprising: A fixed tool base 1, used for placing a VR head display (not shown in the figure); the fixed tool base 1 is provided with an interpupillary distance adjustment mechanism (not shown in the figure); Two cameras 2, arranged in a fixed tooling base 1, corresponding to two visual channels 3 of a VR head display, for collecting and adjusting images; A control terminal is used to obtain the image captured by the camera 2 and calibrate the pupil distance using the VR head display pupil distance calibration method.

[0022] The field of view of the lens of the camera 2 is greater than the field of view of the VR lens.

[0023] A pressure plate 4 is provided on the top of the fixed tooling base 1 for pressurizing the VR head display placed on the fixed tooling base 1 , and an air pump is provided on the pressure plate 4 .

[0024] In the present invention, the hardware equipment includes a camera 2 for shooting. Both cameras 2 are global exposure and programmable control cameras. The cameras 2 are used with different lenses during use, but the field of view of the lens should be greater than the FOV of the VR lens, and dark corners around the lens are not allowed during shooting; the two cameras 2 respectively collect data on the left and right screen lenses of the VR headset.

[0025] In the present invention, the VR headset is arranged on the upper part of the fixed tooling base 1. Specifically, the fixed tooling base 1 should include an isosceles triangle slope top for matching the VR headset, and its two slope tops respectively correspond to the two lenses of the VR headset and the two lenses respectively correspond to the visual channels 3 in the dark box arranged below the isosceles triangle slope top, and cooperate with the camera 2 at the bottom of the dark box; the position of the camera 2 remains unchanged during the entire test process, and the bottom of the fixed tooling base 1 has the function of adjusting the pupil distance.

[0026] In the present invention, in the actual test process, in order to ensure the close fit between the VR lens and the dark box and prevent light leakage, the air pump is used to control the pressure plate 4 to descend, and the VR headset is appropriately pressurized to make the VR lens fit the dark box without causing the lens to move outward; here, the pressure plate 4 is arranged on the back side of the fixed tooling base 1 through the support 5, and the use of the air pump to control the lifting and lowering of the pressure plate 4 is a content that is easy for technical personnel in the field to understand, and technical personnel in the field can set it according to their needs.

[0027] Based on the application of the calibration device, the present invention also relates to a method for calibrating the pupil distance of a VR headset, wherein the method fixes the VR headset at a calibration position, adjusts the pupil distance from the minimum to the maximum, records the focus position information during the pupil distance adjustment process, obtains the pupil distance calibration function based on all the focus position information; and adjusts the pupil distance of the VR headset based on the pupil distance calibration function.

[0028] The method comprises the following steps: S1 After adjusting the interpupillary distance of the VR headset to the minimum position, fix it in the calibration position; S2 In the calibration position, aim a camera 2 at the lens on the corresponding side of the VR headset and adjust it to be stable; Two dark box channels that do not interfere with each other are set in the calibration position; in S2, any VR lens is pointed downward at a dark box channel, and a camera 2 is set at the other end of the dark box channel. The exposure time of camera 2 is adjusted until the picture is stable. To be precise, stable means no flickering.

[0029] S3 starts from the minimum interpupillary distance and adjusts the interpupillary distance based on preset conditions until the interpupillary distance is maximized, and records the focus position information during the process; in actual application, the focus position is marked with a crosshair, and its coordinate information is the coordinate of the cross cross position; When collecting data, the left and right VR lenses are photographed simultaneously and named regularly according to the displayed pupil distance to facilitate later data processing.

[0030] In S3, the interpupillary distance after each adjustment is 0.5 mm larger than the previous one.

[0031] S4 corresponds to each adjustment of S3 to obtain the measured pupil distance; The measured pupil distance refers to the distance between the center points of the two images projected on the display screen measured manually by a measuring instrument.

[0032] S5 collects coordinate information of all focus position information, and obtains displacement of the focus position information with the minimum pupil distance; Here, the Matlab image processing algorithm is used to output the pixel coordinates (x, y) of all crosshairs, and calculate the distance change between the coordinates of the crosshairs corresponding to different pupil distances and the coordinates of the crosshairs with the minimum pupil distance.

[0033] S6 combines the information of S4 and S5 to obtain the pupil distance calibration function; In S6, origin is used to perform linear fitting between the displacement of the measured pupil distance and the focus position information; in fact, the pupil distance calibration verification is also required in practical applications; Repeatedly measure the displacement of the measured pupil distance and focus position information of multiple VR headsets with the same parameters and take the average value to eliminate product errors and perform linear fitting on the mean value.

[0034] In practical applications, for all data in S4 and S5, there is a possibility that there is a large offset between the measured pupil distance and the displacement value, which includes the offset of the measured pupil distance value, the offset of the displacement value and the offset of the function information fitted by the two, and linear repair is required for this; Specifically, the following steps are included: S6.1 Perform linearity determination on the measured pupil distance data. Here, the determination of the measured pupil distance needs to be forced to be linear. If it does not meet the requirements, adjust the VR headset pupil distance calibration equipment or directly scrap the product. S6.2 For one or more groups of displacement values ​​of the same product, perform linear determination and calculate the mean square error of the displacement values. If the value is less than the preset value, it meets the standard and function fitting is performed. Otherwise, the data is discarded. S6.3 For any fitted function: If there is an offset value greater than the preset precision in the function, the current offset value is discarded and the data at the location of the current offset value is padded; If there is an offset value on the function that is less than the preset precision, the position of the current offset value is enveloped and the precision is updated.

[0035] S7 corrects the pupil distance of the VR headset to be calibrated based on the pupil distance calibration function.

[0036] In S7, the pupil distance of the VR headset to be calibrated is adjusted to the minimum, the coordinate information of the focus position information at this time is obtained, the final pupil distance is obtained according to the change in the coordinate distance, the initial pupil distance of the VR headset to be calibrated is calibrated, and the precise pupil distance is obtained after the knob is adjusted.

[0037] In the present invention, origin performs linear fitting on the displacement of the measured pupil distance and the focus position information to obtain a linear relationship, and obtains the relationship between the pupil distance and the focus position coordinates, which can be applied to the calibration of IPD; specifically, before the product leaves the factory, the pupil distance of the product is first adjusted to the minimum distance, and a crosshair picture of the product at this time is taken to obtain the coordinates of the crosshairs, and the final pupil distance is obtained based on the change in the coordinate distance, and the initial pupil distance in the product is calibrated, so that the product can obtain the most accurate initial pupil distance, and then the pupil distance can automatically obtain the precise pupil distance after adjusting the knob based on the linear relationship of the pitch adjustment distance.

[0038] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A method for calibrating pupil distance of a VR head display, characterized in that: The method fixes a VR head display at a calibration position, starts adjusting from a minimum interpupillary distance until the interpupillary distance is maximum, records focus position information during the interpupillary distance adjustment process, obtains an interpupillary distance calibration function based on all the focus position information; and adjusts the interpupillary distance of the VR head display based on the interpupillary distance calibration function.

2. A method for calibrating pupil distance of a VR head display according to claim 1, characterized in that: The method comprises the following steps: S1 After adjusting the interpupillary distance of the VR headset to the minimum position, fix it in the calibration position; S2: In the calibration position, aim a camera at the lens on the corresponding side of the VR headset and adjust it to be stable; S3 starts from the minimum pupil distance and adjusts the pupil distance based on the preset conditions until the pupil distance is maximized, and records the focus position information during the process; S4 corresponds to each adjustment of S3 to obtain the measured pupil distance; S5 collects coordinate information of all focus position information, and obtains displacement of the focus position information with the minimum pupil distance; S6 combines the information of S4 and S5 to obtain the pupil distance calibration function; S7 corrects the pupil distance of the VR headset to be calibrated based on the pupil distance calibration function.

3. A method for calibrating pupil distance of a VR head display according to claim 2, characterized in that: Two dark box channels that do not interfere with each other are set in the calibration position; in S2, any VR lens is pointed downward at a dark box channel, and a camera is set at the other end of the dark box channel. The exposure time of the camera is adjusted until the image is stable.

4. A method for calibrating pupil distance of a VR head display according to claim 2, characterized in that: In S3, the interpupillary distance after each adjustment is 0.5 mm larger than the previous one.

5. A method for calibrating pupil distance of a VR head display according to claim 2, characterized in that: In S6, origin is used to perform linear fitting on the displacement of the measured pupil distance and the focus position information.

6. A method for calibrating pupil distance of a VR head display according to claim 5, characterized in that: Repeatedly measure the displacement of the measured pupil distance and focus position information of multiple VR headsets with the same parameters and take the average, and perform linear fitting on the mean.

7. A method for calibrating pupil distance of a VR head display according to claim 2, characterized in that: In S7, the pupil distance of the VR headset to be calibrated is adjusted to the minimum, the coordinate information of the focus position information at this time is obtained, the final pupil distance is obtained according to the change in the coordinate distance, the initial pupil distance of the VR headset to be calibrated is calibrated, and the precise pupil distance is obtained after the knob is adjusted.

8. A VR head display pupil distance calibration device, characterized in that: The calibration equipment comprises: A fixed tooling base, used to place a VR head display; the fixed tooling base is provided with an interpupillary distance adjustment mechanism; Two cameras, installed in the fixed tooling base, corresponding to the two visual channels of the VR headset, are used to collect and adjust images; A control terminal, used for acquiring images captured by a camera and performing pupil distance calibration using the VR head display pupil distance calibration method according to any one of claims 1 to 7.

9. The VR head display pupil distance calibration device according to claim 8, characterized in that: The field of view of the camera lens is greater than the field of view of the VR lens.

10. The VR head display pupil distance calibration device according to claim 8, characterized in that: A pressure plate is provided on the top of the fixed tooling base for pressurizing the VR head display placed on the fixed tooling base, and an air pump is provided on the pressure plate.

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