CN115876443A - Method and system for aligning measurement geometric center of near-to-eye display device - Google Patents
Method and system for aligning measurement geometric center of near-to-eye display device Download PDFInfo
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Abstract
The invention relates to a method and a system for aligning a measuring geometric center of near-eye display equipment, which comprises the following steps: placing a near-eye display device on a fixture; drawing the near-eye display device and the measuring instrument by using a projector; and adjusting the position of the near-eye display equipment according to the image analysis result, so that the relative positions of the near-eye display equipment and the measuring instrument in multiple spatial directions meet the threshold requirement. The fixture can fix the near-eye display equipment, the projector is used for collecting the outlines of the near-eye display equipment and the measuring instrument, the relative position relation of the near-eye display equipment and the measuring instrument can be directly measured, and the position of the near-eye display equipment is guided to be adjusted, so that the relative positions of the near-eye display equipment and the measuring instrument in multiple spatial directions meet the threshold value requirement, the measuring instrument is positioned at the spatial position of the eye point of the near-eye display equipment, and the accurate alignment of the geometric centers of the measuring instrument and the near-eye display equipment can be realized.
Description
Technical Field
The invention relates to the technical field of optical measurement of near-eye display products, in particular to a method and a system for aligning a measurement geometric center of near-eye display equipment.
Background
Currently, NED (Near eye display), also called head-mounted display or wearable display, can create a virtual image in a single-eye or double-eye viewing field, where NED is a technology for rendering light field information to human eyes through a display device placed in a non-photopic distance of the human eyes, and then reconstructing a virtual scene in front of the eyes. Thus, the AR, VR, MR and XR products are all referred to collectively at the technical level as NED. How to accurately measure the performance of the reconstructed virtual scene is naturally an important ring in the production of NED products. The NED technique has a relatively complex optical path, and an error is small during measurement, and a difference between the real images is large, so that it is necessary to ensure that geometric relative positions of a measuring instrument and an NED product are accurate.
In the related art, the requirement of accuracy of a measurement position cannot be met by fixing an NED product only through a fixture in the prior art, and therefore, a method and a system for aligning a measurement geometric center of a near-eye display device are needed to perform geometric center alignment before optical measurement is performed on the product, so that a geometric position relation between an eyeball and the NED product in an actual wearing process is met.
Disclosure of Invention
The embodiment of the invention provides a method and a system for aligning a measuring geometric center of near-eye display equipment, which aim to solve the problem that the requirement on accuracy of a measuring position cannot be met by fixing an NED product only through a jig in the related art.
In a first aspect, a method for aligning a measurement geometric center of a near-eye display device is provided, which includes the following steps: placing a near-eye display device on a fixture; drawing the near-eye display device and the measuring instrument by using a projector; and adjusting the position of the near-eye display equipment according to the image analysis result to enable the relative position of the near-eye display equipment and the measuring instrument in multiple spatial directions to meet the threshold requirement.
In some embodiments, the using the projector to take the map of the near-eye display device and the measurement instrument includes: and using two groups of projectors to respectively take pictures of the near-eye display equipment and the measuring instrument, wherein the arrangement directions of the two groups of projectors are vertically arranged.
In some embodiments, the adjusting the position of the near-eye display device according to the image analysis result so that the relative positions of the near-eye display device and the measuring instrument in multiple spatial directions meet a threshold requirement includes: and judging whether the position offset and the relative angle of the near-eye display equipment and the measuring instrument in multiple directions meet the threshold requirements according to the image, otherwise, adjusting the position of the near-eye display equipment to enable the position offset and the relative angle of the near-eye display equipment and the measuring instrument in multiple spatial directions to meet the threshold requirements.
In some embodiments, the determining, according to the image, whether the position offset and the relative angle of the near-eye display device and the measurement instrument in the multiple directions satisfy the threshold requirements, and otherwise, adjusting the position of the near-eye display device so that the position offset and the relative angle of the near-eye display device and the measurement instrument in the multiple directions in space satisfy the threshold requirements includes: calculating a relative angle1 and a position offset1 between a first line segment and a second line segment according to an image, wherein the first line segment is formed by projecting the end face of the measuring instrument in the X-axis direction, and the second line segment is formed by projecting the end face of the near-eye display device in the X-axis direction; it is determined whether the relative angle1 satisfies the first angle threshold and the position offset1 satisfies the first displacement threshold, otherwise, driving the near-eye display device to move along the Y-axis and rotate relative to the Y-axis according to the position offset1 and the relative angle1 until the relative angle1 satisfies the first angle threshold and the position offset1 satisfies the first displacement threshold; calculating a relative angle2 and a position offset2 between a third line segment and a fourth line segment according to the image, wherein the third line segment is formed by projecting the end face of the measuring instrument in the Y-axis direction, and the fourth line segment is formed by projecting the end face of the near-eye display device in the Y-axis direction; it is determined whether the relative angle2 satisfies the second angle threshold and the position offset2 satisfies the second displacement threshold, otherwise the near-eye display device is driven to move along the X-axis and rotate with respect to the X-axis according to the position offset2 and the relative angle2, until the relative angle2 satisfies the second angle threshold and the position offset2 satisfies the second displacement threshold.
In some embodiments, the determining, according to the image, whether the position offset and the relative angle of the near-eye display device and the measuring instrument in the multiple directions satisfy the threshold requirements, and otherwise, adjusting the position of the near-eye display device so that the position offset and the relative angle of the near-eye display device and the measuring instrument in the multiple directions in space satisfy the threshold requirements further includes: calculating a distance between the third line segment and the fourth line segment, and a length of the fourth line segment; and judging whether the difference between the distance and the preset entrance pupil distance meets a distance threshold value and whether the length is shortest or not, and driving the near-eye display device to move along the Z axis and rotate relative to the Z axis according to the distance and the length if not until the distance difference meets the distance threshold value and the length is shortest.
In some embodiments, after determining whether a difference between the distance and the preset entrance pupil distance satisfies a distance threshold and the length is shortest, and otherwise, driving the near-eye display device to move along the Z axis and rotate relative to the Z axis according to the distance and the length until the distance difference satisfies the distance threshold and the length is shortest, the method further includes: judging whether the relative angle1 meets a first angle threshold value and the position offset1 meets a first displacement threshold value, if so, finishing the alignment of the geometric center, otherwise, continuously adjusting the position and the angle of the near-eye display device along the Y axis, the X axis and the Z axis respectively until the position offsets of the near-eye display device and the measuring instrument along the X axis, the Y axis and the Z axis meet the threshold value requirement, and the relative angles of the near-eye display device and the measuring instrument along the X axis, the Y axis and the Z axis meet the threshold value requirement.
In some embodiments, the near-eye display device is driven to rotate in two opposite directions by preset angles relative to the Z axis, and the length of the fourth line segment is calculated respectively, so as to determine whether the length is shortest.
In some embodiments, the adjusting the position of the near-eye display device according to the image analysis result so that the relative positions of the near-eye display device and the measuring instrument in multiple spatial directions meet a threshold requirement includes: adjusting the position of the near-eye display equipment according to the image analysis result to enable the relative position of the near-eye display equipment and the measuring instrument in multiple spatial directions to meet a first threshold requirement; and adjusting the position of the near-eye display device according to the image analysis result to enable the relative position of the near-eye display device and the measuring instrument in multiple spatial directions to meet a second threshold value requirement, wherein the range of the second threshold value is smaller than the range of the first threshold value.
In a second aspect, a system for measuring geometric center alignment of a near-eye display device is provided, comprising: the adjusting mechanism is provided with a clamp, and the clamp is used for placing the near-eye display equipment; a projector for taking pictures of the near-eye display device and a measuring instrument; the controller is in signal connection with the projector and the adjusting mechanism, and is used for calculating and analyzing the image acquired by the projector, and controlling the adjusting mechanism to adjust the position of the near-eye display device according to the analysis result, so that the relative positions of the near-eye display device and the measuring instrument in multiple spatial directions meet the threshold requirement.
In some embodiments, the system for measuring geometric center alignment includes two sets of projectors, and the arrangement directions of the two sets of projectors are vertically arranged.
The technical scheme provided by the invention has the beneficial effects that:
the embodiment of the invention provides a method and a system for aligning a measuring geometric center of near-eye display equipment.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for measuring geometric center alignment of a near-eye display device according to an embodiment of the present invention;
fig. 2 is a flowchart of another method for measuring geometric center alignment of a near-eye display device according to an embodiment of the present invention;
fig. 3 is a flowchart of a method for measuring geometric center alignment of a near-eye display device according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a system for measuring geometric center alignment of a near-eye display device according to an embodiment of the present invention.
In the figure:
1. an adjustment mechanism; 2. a clamp; 3. a near-eye display device;
4. a projector; 41. a projector A; 42. a projector B; 5. a measuring instrument.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment of the invention provides a method and a system for aligning a measuring geometric center of near-eye display equipment, which can solve the problem that the requirement on accuracy of a measuring position cannot be met by fixing an NED product only through a jig in the related technology.
Referring to fig. 1, a method for measuring geometric center alignment of a near-eye display device according to an embodiment of the present invention may include the following steps:
s11: the near-eye display device 3 is placed on the jig 2, the near-eye display device 3 is fixed by the jig 2, and at the same time, the near-eye display device 3 can be moved to a mechanically positioned position.
S12: the near-eye display apparatus 3 and the measuring instrument 5 are imaged using the projector 4. Before step S2, the projector 4 may be turned on, the near-eye display device 3 and the surveying instrument 5 may be photographed using the projector 4, and it is ensured that end faces of the near-eye display device 3 and the surveying instrument 5, which are close to each other, are both brought into the field of view of the projector 4.
S13: and adjusting the position of the near-eye display device 3 according to the image analysis result to enable the relative positions of the near-eye display device 3 and the measuring instrument 5 in multiple spatial directions to meet the threshold requirement. That is, the relative positional relationship between the near-eye display device 3 and the measuring instrument 5, whether there is a deviation and how much the deviation is, can be analyzed from the image taken by the projector 4, and further, the position of the near-eye display device 3 can be adjusted according to the analysis result, so that the near-eye display device 3 and the measuring instrument 5 are centered in a plurality of directions.
In this embodiment, the fixture 2 may fix the near-eye display device 3, so that the near-eye display device 3 may not move randomly, which is beneficial for subsequent accurate adjustment, and then the projector 4 may shoot and collect the outlines of the near-eye display device 3 and the measuring instrument 5 in real time, so as to directly measure the relative position relationship between the near-eye display device 3 and the measuring instrument 5, and guide to adjust the position of the near-eye display device 3 according to the measurement and analysis result, so that the relative positions of the near-eye display device 3 and the measuring instrument 5 in multiple directions of the space all meet the threshold requirement, so as to allow the measuring instrument 5 to be located at the spatial position of the eye-entering point of the near-eye display device 3, and therefore, accurate alignment of the geometric centers of the measuring instrument 5 and the near-eye display device 3 may be achieved.
Also, when adjusting the position of the near-eye display device 3, the position of the jig 2 may be adjusted using a six-axis robot to achieve adjustment of the near-eye display device 3. The six-axis manipulator can realize six-degree-of-freedom adjustment, namely movement along the X, Y and Z-axis directions and RX, RY and RZ (namely rotation angles relative to the X, Y and Z axes). The Y-axis direction may be an up-down direction, the Z-axis direction may be a horizontal direction and extend along the axis of the near-eye display device 3, and the X-axis direction is also a horizontal direction and is perpendicular to the Y-axis and the Z-axis.
In some embodiments, referring to fig. 4, in step S12, the using the projector 4 to take the image of the near-eye display device 3 and the measuring instrument 5 may include: the near-eye display apparatus 3 and the surveying instrument 5 are respectively imaged using two sets of projectors 4, wherein the arrangement directions of the two sets of projectors 4 are vertically set. In this embodiment, one set of projectors 4 may be arranged along the X-axis direction and is denoted as a projector a41, another set of projectors 4 may be arranged along the Y-axis direction, and the projection directions of the two sets of projectors 4 are perpendicular and is denoted as a projector B42, but of course, in other embodiments, the Z-axis may also be set to be the up-down direction, and the projectors 4 may also be arranged in the Z-axis direction, which is not limited herein and may be adjusted according to actual situations. Photographing the near-eye display device 3 with two sets of projectors 4 in two directions enables measurement of the position of the near-eye display device 3 from six degrees of freedom in space, controlling the relative positional relationship between the near-eye display device 3 and the measuring instrument 5.
In some optional embodiments, the adjusting the position of the near-eye display device 3 according to the image analysis result so that the relative positions of the near-eye display device 3 and the measuring instrument 5 in multiple spatial directions meet a threshold requirement may include: and judging whether the position offset and the relative angle of the near-eye display equipment 3 and the measuring instrument 5 in multiple directions meet the threshold requirements according to the image, otherwise, adjusting the position of the near-eye display equipment 3 to enable the position offset and the relative angle of the near-eye display equipment 3 and the measuring instrument 5 in multiple spatial directions to meet the threshold requirements. The plurality of directions at least include two directions, and not only the position deviation in a certain direction is judged and adjusted, but also the relative angle between the near-eye display device 3 and the measuring instrument 5 is judged and adjusted, so that the angle deviation between the near-eye display device 3 and the measuring instrument 5 can be reduced, and the deviation between the geometric centers of the near-eye display device 3 and the measuring instrument 5 is effectively reduced.
Further, referring to fig. 3, the determining, according to the image, whether the position offset and the relative angle of the near-eye display device 3 and the measuring instrument 5 in the multiple directions satisfy the threshold requirements, and otherwise, adjusting the position of the near-eye display device 3 so that the position offset and the relative angle of the near-eye display device 3 and the measuring instrument 5 in the multiple spatial directions satisfy the threshold requirements may include:
s21: a relative angle1 and a position offset1 between a first line segment L1 and a second line segment L2 are calculated from an image, where the first line segment L1 is a line segment formed by projecting the end face of the surveying instrument 5 in the X-axis direction, the second line segment L2 is a line segment formed by projecting the end face of the near-eye display device 3 in the X-axis direction, and the end face here is understood as an end face where the near-eye display device 3 and the surveying instrument 5 are close to each other, and the image used in this step is an image acquired by the projector a 41.
S22: it is determined whether the relative angle1 satisfies the first angle threshold angle1_ limit and the position offset1 satisfies the first displacement threshold offset1_ limit, otherwise the near-eye display device 3 is driven to move along the Y-axis and rotate with respect to the Y-axis according to the position offset1 and the relative angle1 until the relative angle1 satisfies the first angle threshold and the position offset1 satisfies the first displacement threshold. If both are satisfied, step S23 is performed.
S23: a relative angle2 and a position offset2 between a third line segment L3 and a fourth line segment L4 are calculated from an image, the third line segment L3 being a line segment formed by projecting the end face of the surveying instrument 5 in the Y-axis direction, the fourth line segment L4 being a line segment formed by projecting the end face of the near-eye display apparatus 3 in the Y-axis direction, the image used in this step being an image acquired by the projector B42.
S24: it is determined whether the relative angle2 satisfies the second angle threshold angle2_ limit and the position offset2 satisfies the second displacement threshold offset2_ limit, otherwise, the near-eye display device 3 is driven to move along the X-axis and rotate with respect to the X-axis according to the position offset2 and the relative angle2 until the relative angle2 satisfies the second angle threshold and the position offset2 satisfies the second displacement threshold.
In step S21, the position offset1 may be obtained by measuring the offset of the midpoint position of the first line segment L1 and the second line segment L2 in the Y-axis direction, or may be obtained by selecting the offset of other corresponding positions in the Y-axis direction, such as two end points or any position between two end points; the near-eye display device 3 can be adjusted through steps S21 and S22 so that the amount of positional deviation between the near-eye display device 3 and the measuring instrument 5 along the Y-axis direction is within a first displacement threshold value and the relative angle between the near-eye display device 3 and the measuring instrument 5 along the Y-axis direction is within a first angle threshold value; in step S23, the position offset2 may be obtained by measuring the offset of the midpoint position of the third line segment L3 and the fourth line segment L4 in the X-axis direction, or may be obtained by selecting the offset of other corresponding positions in the X-axis direction, such as two end points or any position between two end points; through steps S23 and S24, the near-eye display device 3 may be adjusted to make the amount of position offset between the near-eye display device 3 and the measuring instrument 5 along the X-axis direction within the second displacement threshold, and make the relative angle between the near-eye display device 3 and the measuring instrument 5 along the X-axis direction within the second angle threshold, so as to ensure that the geometric center of the near-eye display device 3 is aligned with the geometric center of the measuring instrument 5 as much as possible. Wherein, the steps S23, S24 can be interchanged with the steps S21, S22.
In some embodiments, referring to fig. 3, the determining, according to the image, whether the position offset and the relative angle of the near-eye display device 3 and the measuring instrument 5 in the multiple directions satisfy the threshold requirements, and otherwise, adjusting the position of the near-eye display device 3 so that the position offset and the relative angle of the near-eye display device 3 and the measuring instrument 5 in the multiple spatial directions satisfy the threshold requirements, may further include: calculating a distance between the third line segment L3 and the fourth line segment L4, and a length of the fourth line segment, wherein the step may be performed synchronously with step S23, or after step S23; judging whether the difference between the distance and the preset entrance pupil distance (eye distance) satisfies a distance threshold distance _ limit and whether the length is shortest, otherwise, driving the near-eye display device 3 to move along the Z-axis and rotate relative to the Z-axis according to the distance and the length until the distance difference satisfies the distance threshold and the length is shortest, which may be performed synchronously with step S24, or after step S24.
In this embodiment, the distance may be a distance between centers of the third line segment L3 and the fourth line segment L4, when a difference between the distance and the preset entrance pupil distance satisfies a distance threshold, it indicates that the centers of the near-eye display device 3 and the measuring instrument 5 are aligned in the Z-axis direction, and when the length is shortest, it indicates that the end surface of the near-eye display device 3 is parallel to the end surface of the measuring instrument 5, and at this time, a relative angle between the near-eye display device 3 and the measuring instrument 5 in the Z-axis direction satisfies a requirement.
In some optional embodiments, after determining whether a difference between the distance and the preset entrance pupil distance satisfies the distance threshold and the length is shortest, and otherwise, driving the near-eye display device 3 to move along the Z axis and rotate with respect to the Z axis according to the distance and the length until the distance difference satisfies the distance threshold and the length is shortest, the method may further include: judging whether the relative angle1 meets a first angle threshold value and the position offset1 meets a first displacement threshold value, if so, finishing the alignment of the geometric center, otherwise, continuously adjusting the position and the angle of the near-to-eye display device 3 along the Y axis, the X axis and the Z axis respectively until the position offsets of the near-to-eye display device 3 and the measuring instrument 5 along the X axis, the Y axis and the Z axis meet the threshold value requirement, and the relative angles of the near-to-eye display device 3 and the measuring instrument 5 along the X axis, the Y axis and the Z axis meet the threshold value requirement.
That is, in the present embodiment, after the X, Y, and Z-axis direction positions and the RX, RY, and RZ directions of the near-eye display device 3 are adjusted, the relative angle1 and the position offset1 are determined again, so that a situation where the position and angle in the Y direction adjusted before after the position and angle in the Z direction are adjusted do not satisfy the requirements is avoided, and finally, the relative positional relationship of six degrees of freedom is accurate.
Further, in determining whether the length is shortest, the near-eye display device 3 may be driven to rotate in two opposite directions by a preset angle (i.e., performed at least twice) with respect to the Z-axis, respectively, and the length of the fourth line segment is calculated, respectively, to determine whether the length is shortest, so as to accurately determine the minimum value position of the length.
In some embodiments, referring to fig. 2, the adjusting the position of the near-eye display device 3 according to the image analysis result so that the relative positions of the near-eye display device 3 and the measuring instrument 5 in multiple spatial directions meet a threshold requirement may include: adjusting the position of the near-eye display device 3 according to the image analysis result to enable the relative position of the near-eye display device 3 and the measuring instrument 5 in multiple spatial directions to meet a first threshold requirement; and adjusting the position of the near-eye display device 3 according to the image analysis result to enable the relative position of the near-eye display device 3 and the measuring instrument 5 in multiple spatial directions to meet a second threshold value requirement, wherein the range of the second threshold value is smaller than the range of the first threshold value. That is, coarse adjustment of the near-eye display device 3 can be achieved according to the first threshold, and fine adjustment of the near-eye display device 3 can be achieved according to the second threshold, so that the adjustment process can be divided into two parts, large-step coarse adjustment and small-step fine adjustment, and the center of the near-eye display device 3 and the center of the measuring instrument 5 are gradually adjusted to an aligned state. Wherein, the first threshold of the angle (RX, RY, RZ) can be recorded as an error threshold angle _ pre, and the first threshold of the displacement (X, Y, Z) can be recorded as an error threshold offset _ pre; the second threshold for the angle (RX, RY, RZ) may be denoted as error threshold angle _ end and the second threshold for the displacement (X, Y, Z) may be denoted as error threshold offset _ end.
According to the method for aligning the measurement geometric centers of the near-eye display equipment, the projector 4 is used for collecting the outlines of the near-eye display equipment 3 and the measuring instrument 5, and the relative position relation of the near-eye display equipment and the measuring instrument can be directly measured; starting from the six spatial degrees of freedom, analyzing the position characteristic relation between the near-eye display equipment 3 and the measuring instrument 5; the projector 4 is arranged in a cross manner, so that the relative position relation of six degrees of freedom between the near-eye display device 3 and the measuring instrument 5 can be obtained, and the optical performance of the near-eye display device 3 to be measured finally cannot be interfered. The method can simulate the installation position of the NED module on the terminal product before the NED module is assembled on the terminal product, so that the real optical performance finally assembled on the terminal product is truly reflected. If the detection of assembling the terminal product is simulated before the NED module is delivered, some unqualified products can be found out, and the back-and-forth transportation cost is saved. Before the terminal product is assembled, the performance of the terminal product is simulated and detected, unqualified products can be eliminated, and complex work of dismantling after assembly is avoided.
Referring to fig. 4, a system for measuring geometric center alignment of a near-eye display device according to an embodiment of the present invention may include: the adjusting mechanism 1 is provided with a clamp 2, the clamp 2 is used for placing a near-eye display device 3, the adjusting mechanism 1 can be a six-axis manipulator, and an included angle can be driven to realize movement in six degrees of freedom; a projector 4, the projector 4 being configured to take pictures of the near-eye display device 3 and a measurement instrument 5; the controller is in signal connection with the projector 4 and the adjusting mechanism 1, and is used for performing calculation analysis on the image acquired by the projector 4 and controlling the adjusting mechanism 1 to adjust the position of the near-eye display device 3 according to an analysis result, so that the relative positions of the near-eye display device 3 and the measuring instrument 5 in multiple spatial directions meet threshold requirements.
In the embodiment, a high-precision projector 4 is adopted to obtain images in real time, and the geometric relative position relationship between the near-eye display device 3 and the measuring instrument 5 can be analyzed in real time by matching with an algorithm carried by a controller; and six high-precision axis control systems of the adjusting mechanism 1 are adopted to guide the six-axis adjusting mechanism 1 to adjust in real time according to the algorithm feedback result, and the geometric relative position relation between the near-eye display device 3 and the measuring instrument 5 is controlled from six spatial degrees of freedom.
In some embodiments, the geometric center alignment system may include two sets of projectors 4, and the arrangement directions of the two sets of projectors 4 are set vertically. The two sets of projectors 4 are a projector a41 and a projector B42, respectively, the projector a41 being arranged along the X axis and the projector B42 being arranged along the Y axis.
The system for aligning the measurement geometric center of the near-eye display device provided by the embodiment of the invention can shoot the geometric position relationship between the near-eye display device 3 and the measuring instrument 5 in real time through the projector 4, and guide the six-axis adjusting mechanism 1 to adjust the relative position between the near-eye display device 3 and the measuring instrument 5, so that the measuring instrument 5 is positioned at the spatial position of the eye point of the near-eye display device 3, and finally the geometric position relationship between the eyeball and the near-eye display device 3 in the actual wearing process is met.
In the description of the present invention, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.
It is to be noted that, in the present invention, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrases "comprising a," "8230," "8230," or "comprising" does not exclude the presence of additional like elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for aligning the measurement geometric center of a near-eye display device is characterized by comprising the following steps:
placing a near-eye display device (3) on a fixture (2);
drawing the near-eye display device (3) and the measuring instrument (5) by using a projector (4);
and adjusting the position of the near-eye display device (3) according to the image analysis result, so that the relative positions of the near-eye display device (3) and the measuring instrument (5) in multiple spatial directions meet the threshold requirement.
2. The method for aligning the geometric center of measurement of a near-eye display device according to claim 1, wherein the mapping the near-eye display device (3) and the measurement instrument (5) using the projector (4) comprises:
and drawing the near-eye display device (3) and the measuring instrument (5) by using two groups of projectors (4), wherein the arrangement directions of the two groups of projectors (4) are vertically arranged.
3. The method for aligning the geometric center of measurement of a near-eye display device according to claim 1, wherein the adjusting the position of the near-eye display device (3) according to the image analysis result so that the relative positions of the near-eye display device (3) and the measuring instrument (5) in a plurality of spatial directions meet a threshold requirement comprises:
and judging whether the position offset and the relative angle of the near-eye display device (3) and the measuring instrument (5) in multiple directions meet threshold requirements according to the image, otherwise, adjusting the position of the near-eye display device (3) to enable the position offset and the relative angle of the near-eye display device (3) and the measuring instrument (5) in multiple spatial directions to meet the threshold requirements.
4. The method for aligning the geometric centers of measurement of a near-eye display device according to claim 3, wherein the determining whether the position offset and the relative angle of the near-eye display device (3) and the measuring instrument (5) in multiple directions satisfy the threshold requirements according to the image, and otherwise, adjusting the position of the near-eye display device (3) to make the position offset and the relative angle of the near-eye display device (3) and the measuring instrument (5) in multiple directions in space satisfy the threshold requirements comprises:
calculating a relative angle1 and a position offset1 between a first line segment and a second line segment from the image, wherein the first line segment is a line segment formed by projection of the end face of the measuring instrument (5) in the X-axis direction, and the second line segment is a line segment formed by projection of the end face of the near-eye display device (3) in the X-axis direction;
it is determined whether the relative angle1 satisfies the first angle threshold and the position offset1 satisfies the first displacement threshold, otherwise driving the near-eye display device (3) to move along the Y-axis and rotate relative to the Y-axis according to the position offset1 and the relative angle1 until the relative angle1 satisfies a first angle threshold and the position offset1 satisfies a first displacement threshold;
calculating a relative angle2 and a position offset2 between a third line segment and a fourth line segment from the image, wherein the third line segment is a line segment formed by projecting the end face of the measuring instrument (5) in the Y-axis direction, and the fourth line segment is a line segment formed by projecting the end face of the near-eye display device (3) in the Y-axis direction;
and judging whether the relative angle2 meets a second angle threshold value and the position offset2 meets a second displacement threshold value, otherwise driving the near-eye display device (3) to move along the X axis and rotate relative to the X axis according to the position offset2 and the relative angle2 until the relative angle2 meets the second angle threshold value and the position offset2 meets the second displacement threshold value.
5. The method for measuring geometric center alignment of a near-eye display device according to claim 4, wherein the determining whether the position offset and the relative angle of the near-eye display device (3) and the measuring instrument (5) in multiple directions satisfy the threshold requirements according to the image, and otherwise, adjusting the position of the near-eye display device (3) to make the position offset and the relative angle of the near-eye display device (3) and the measuring instrument (5) in multiple spatial directions satisfy the threshold requirements further comprises:
calculating the distance between the third line segment and the fourth line segment and the length of the fourth line segment;
and judging whether the difference between the distance and the preset entrance pupil distance meets a distance threshold value and whether the length is shortest or not, and driving the near-eye display device (3) to move along the Z axis and rotate relative to the Z axis according to the distance and the length until the distance difference meets the distance threshold value and the length is shortest.
6. The method for measuring geometric center alignment of a near-eye display device according to claim 5, wherein after determining whether a difference between the distance and the preset entrance pupil distance satisfies a distance threshold and the length is shortest, and otherwise driving the near-eye display device (3) to move along the Z-axis and rotate relative to the Z-axis according to the distance and the length until the distance difference satisfies the distance threshold and the length is shortest, further comprising:
it is determined whether the relative angle1 satisfies the first angle threshold and the position offset1 satisfies the first displacement threshold,
if so, finishing the alignment of the geometric center, otherwise, continuously adjusting the positions and the angles of the near-eye display device (3) along the Y axis, the X axis and the Z axis respectively until the position offsets of the near-eye display device (3) and the measuring instrument (5) along the X axis, the Y axis and the Z axis meet the threshold requirement, and the relative angles of the near-eye display device (3) and the measuring instrument (5) along the X axis, the Y axis and the Z axis meet the threshold requirement.
7. The method for measuring geometric center alignment of a near-eye display device according to claim 5, wherein:
and driving the near-eye display device (3) to rotate in two opposite directions by preset angles relative to the Z axis respectively, calculating the length of the fourth line segment respectively, and judging whether the length is shortest or not.
8. The method for aligning the geometric center of measurement of a near-eye display device according to claim 1, wherein the adjusting the position of the near-eye display device (3) according to the image analysis result so that the relative positions of the near-eye display device (3) and the measuring instrument (5) in a plurality of spatial directions meet a threshold requirement comprises:
adjusting the position of the near-eye display device (3) according to the image analysis result to enable the relative position of the near-eye display device (3) and the measuring instrument (5) in multiple spatial directions to meet a first threshold requirement;
and adjusting the position of the near-eye display device (3) according to the image analysis result to enable the relative position of the near-eye display device (3) and the measuring instrument (5) in multiple spatial directions to meet a second threshold value requirement, wherein the range of the second threshold value is smaller than the range of the first threshold value.
9. A system for measuring geometric center alignment of a near-eye display device, comprising:
the near-eye display device comprises an adjusting mechanism (1), wherein a clamp (2) is mounted on the adjusting mechanism (1), and the clamp (2) is used for placing the near-eye display device (3);
a projector (4), the projector (4) being configured to take pictures of the near-eye display device (3) and a measurement instrument (5);
the controller is in signal connection with the projector (4), is in signal connection with the adjusting mechanism (1), and is used for performing calculation analysis on the image acquired by the projector (4) and controlling the adjusting mechanism (1) to adjust the position of the near-eye display device (3) according to an analysis result so that the relative positions of the near-eye display device (3) and the measuring instrument (5) in multiple spatial directions meet threshold requirements.
10. The system for measuring geometric center alignment of a near-eye display device of claim 9, wherein:
the geometric center alignment measuring system comprises two groups of projectors (4), and the arrangement directions of the two groups of projectors (4) are perpendicular to each other.
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| CN116183169A (en) * | 2023-05-04 | 2023-05-30 | 武汉精立电子技术有限公司 | Center alignment method, device and equipment for displaying product image and storage medium |
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| CN116183169A (en) * | 2023-05-04 | 2023-05-30 | 武汉精立电子技术有限公司 | Center alignment method, device and equipment for displaying product image and storage medium |
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