CN107968938B - Direction correction device, projection emission device and projection image correction method - Google Patents
Direction correction device, projection emission device and projection image correction method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
- H04N9/3161—Modulator illumination systems using laser light sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
- H04N9/315—Modulator illumination systems
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/142—Adjusting of projection optics
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/147—Optical correction of image distortions, e.g. keystone
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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Abstract
The invention discloses a direction correction device, a projection emission device and a projection image correction method, wherein the direction correction device comprises an image acquisition unit, light beam emission units are arranged around the image acquisition unit, the image acquisition unit receives light spot information projected to a projection plane by the light beam emission units, and the central point positions of the light beam emission units and the image acquisition unit are on the same axis; the image analysis processing unit is used for comparing the light spot information projected to the projection plane by the light beam emission unit with a standard graph to obtain a direction correction control signal; and the image acquisition unit receives the light spot information projected to the projection plane by the light beam emission unit and then sends the light spot information to the image analysis processing unit. The device can be applied to angle adjustment of the target device. The invention can correct the image distortion without processing the video output signal, and has the characteristics of simple operation and small image distortion degree.
Description
The application aims at the following application numbers: 201110455056.2, filing date: 2011-12-28, entitled "orientation rectification device, projection emission device, projection image rectification system and projection image rectification method".
Technical Field
The invention relates to the technical field of mechanical control, in particular to the technical field of mechanical correction of the projection direction of a projection emission device.
Background
In daily life, it is often the case that the pointing direction of a target device is accurately adjusted. For example, when an image is projected by a projector, a projection lens needs to be projected perpendicularly to a projection screen in order to avoid distortion. However, when the projector is first mounted or the mounting position of the projector is changed, the projection lens may not be positioned perpendicular to the projection screen. The source image is sent out by the projection lens, and due to the problems of the arrangement position angle and the like, the effect of projection on the projection screen is a distorted image.
In the prior art, the inventor finds that the trapezoidal distortion of the vertical angle of a picture is corrected by the current projection equipment with automatic correction through a gravity sensor, the distortion in other directions needs to be manually adjusted, the operation is not convenient, and the installation and debugging consume time. In addition, when the image distortion correction of the projection apparatus is performed, it is necessary to perform the correction in a state where the projection lens projects an image, which is inconvenient.
In addition, in the conventional projection technology, after a distortion angle is detected, a signal processing circuit adjusts an output signal to correct shape distortion of an output projection. However, the output image signal is changed from the original image signal while the image signal processing is performed, and the original image signal cannot be reproduced completely and truly.
Disclosure of Invention
In order to solve the above problems and other problems in the prior art, an embodiment of the present invention provides a new direction correction device, which includes an image acquisition unit, an image analysis processing unit, and a direction correction unit. The image acquisition unit is provided with a light beam emission unit around (e.g. around or near) the image acquisition unit, and the light beam emission unit can emit light beams in a certain geometric shape, for example, the projection shape of the light beams on the cross section perpendicular to the light beam emission direction is ring-shaped or circular, or a plurality of point-shaped pattern structures distributed in a ring shape around the center point of the light beam emission unit. The light beam may consist of parallel light or of divergent light. And the image acquisition unit receives the light spot information projected to the projection plane by the light beam emission unit. And the image analysis processing unit is used for comparing the light spot information projected to the projection plane by the light beam emission unit with the standard graph to obtain a direction correction control signal and controlling the direction pointed by a device (such as a projection lens or a projection screen) with the direction to be adjusted. The device can be applied to angle adjustment of a target device (such as a projection lens or a projection screen).
In addition, the invention also provides a corresponding projection emission device, a projection image correction system and a projection image correction method.
The invention can correct the image distortion of the projected image without processing the video output signal, and has the characteristics of simple operation and small image distortion degree.
In addition, in some embodiments provided by the present invention, the operation mode of the direction correction device may operate independently of the operation mode of the projection emission device, and the direction of the projection lens may be adjusted under the condition that the projection emission device does not output images, so that power may be saved.
Drawings
Fig. 1a is a schematic view of an optical path and a deflection angle between a projection direction thereof and a projection screen when a light beam emitted by a light beam emitting unit is parallel light according to embodiment 1 of the present invention;
fig. 1b is a schematic diagram illustrating an optical path and a projection direction thereof and a deflection angle correction condition of a projection screen when a light beam emitted by a light beam emitting unit is a parallel light according to embodiment 1 of the present invention;
fig. 2 is a schematic view of an optical path of a light beam emitted by the light beam emission unit and a projection direction thereof and a correction condition of a deflection angle of a projection screen according to embodiment 2 of the present invention;
fig. 3a is a schematic view of the light path and the projection direction of the light beam emitted by the light beam emitting unit and the deflection angle of the projection screen in the case that the light beam emitted by the light beam emitting unit is divergent light according to embodiment 5 of the present invention;
fig. 3b is a schematic diagram illustrating an optical path and a projection direction thereof and a situation of correcting a deflection angle of a projection screen when a light beam emitted by the light beam emitting unit according to embodiment 5 of the present invention is divergent light;
FIG. 4 is a system block diagram of a projection emission device according to embodiment 11 of the present invention;
FIG. 5a is a block diagram showing a projection image rectification system according to embodiment 12 of the present invention;
FIG. 5b is a block diagram of a projection image rectification system according to embodiment 13 of the present invention;
fig. 6 is a flowchart of a method for correcting a projection image according to embodiment 14 of the present invention.
Fig. 7 to 10 are schematic diagrams of a manner of forming a hole in a lens cover of a projector according to embodiment 15 or 16 of the present invention instead of the light beam emitting unit.
Detailed Description
In order to make the technical scheme of the invention clearer, the invention is described in detail below with reference to the accompanying drawings and specific embodiments.
Example 1
Embodiment 1 of the present invention provides a direction correction device, which includes an image acquisition unit, such as a camera, and light beam emission units, such as an infrared laser, a visible laser, or other devices that emit high-energy light beams, are installed around the image acquisition unit. The projection shape of the light beam emitted by the light beam emitting unit on the cross section perpendicular to the light beam emitting direction is annular, the central point positions of the light beam emitting unit and the image acquisition unit are on the same axis, and the light beams emitted by the light beam emitting unit are parallel to each other.
Firstly, a light beam emitting unit projects a light beam onto a projection plane, and an image acquisition unit acquires light spot information emitted onto the projection plane by the light beam emitting unit and sends the light spot information to an image analysis processing unit. The image analysis processing unit extracts the shape information of the light spot and constructs an operation model by the following method.
Assuming that the outer diameter of the annular light spot is AB and the projection direction of the light beam emission unit is not perpendicular or parallel to the projection plane, the light spot shape formed on the projection plane by the light beam emission unit will be an ellipse, as shown in fig. 1a, the position of the light emitter of the light beam emission unit is a circular ring 101 below fig. 1, the light spot shape formed on the projection plane by the light beam emission unit is an elliptical ring 102 above fig. 1, the center position of the elliptical ring 102 is point O, AB is the long axis of the ellipse 102, point a is an end point on the long axis of the ellipse 102, the circle where the vector AB is located is the projection of the projection light beam on the plane passing point a and perpendicular to the projection light beam is called a standard figure, and the vector AB is the projection of the vector AB on the.
In order to make the projection direction of the light beam emission unit perpendicular to the projection plane, the image analysis processing unit obtains control information by the following operation method under the condition that the projection plane is not changed, and sends the control information to a direction correction unit on a device to be adjusted (the device to be adjusted can be the direction correction device itself, and can also be other devices fixedly connected with the direction correction device, such as a projection lens), and the direction of the device to be adjusted is adjusted. The device to be adjusted is taken as a projection lens, and the center point of the projection lens and the center point of the light beam emitting unit on the direction correcting device are on the same axis. Since the center point of the projection lens and the center point of the light beam emitting unit on the direction correction device are on the same axis, the center point of the projection image projected by the projection lens is also overlapped with the center point of the projection image projected by the direction correction device, and the projection direction of the projection lens is the projection direction of the direction correction device.
For example, ∠ bAB, if B is above B, i.e. B is behind the plane of the circle 103, it is defined as ∠ bAB > 0, if B is below B, i.e. B is in front of the plane of the circle 103, it is defined as ∠ bAB < 0, and if B coincides with B, it is defined as ∠ Bab 0 (the definition of angle is the same as that of angle, and will not be described again).
When ∠ bAB is greater than 0, as shown in fig. 1b, the image analysis processing unit sends a direction correction control signal to the direction correction unit, so that the projection direction of the direction correction device, i.e., the projection direction XP of the projection lens, is rotated by an angle ∠ bAB (until the direction XP is pointed) along the direction of the vector bA, that is, the position of the light beam emission unit from 101 is adjusted to the position of the dashed line ring 104 in fig. 1a, even if the position of a light spot of a light beam projected by the light beam emission unit on the projection plane is a dashed line circle 105, and the center point is an o point, at this time, the direction of the projection lens is perpendicular to the projection plane, when ∠ bAB is less than 0, the opposite direction adjustment can be performed according to a similar method, which is not described again, when ∠ bAB is equal to 0, the direction of the projection lens is already.
After the direction of the projection lens is rotated from XP to XP perpendicular to the screen, if the position of the light beam emitting unit and the position of the projection plane are not changed, the center point of the projected image is also shifted from the original center point O of the ellipse 102 to a new projection position (i.e., the center point O of the circle 105). If the central point of the projected image is still expected to be at the point O, the light beam emitting unit can be translated on the plane parallel to the projection screen along the direction of the vector oO without adjusting the screen position until the projected central point coincides with the point O.
The projection light beam may have a circular cross-section or a plurality of point-shaped patterns annularly distributed around the center point of the light beam emitting unit, and the method for adjusting the projection lens is similar to that of the present embodiment and will not be described again. (of course, a circle is also possible, the principle of which is substantially the same as the implementation, and will not be listed below).
If the central point of the light beam emitting unit is adjacent to but not coincident with the central point of the image collecting unit, for example, the light beam emitting unit is located below the image collecting unit, because the distance between the central point of the light beam emitting unit and the central point of the image collecting unit is very small relative to the distance between the direction correcting device and the projection plane, the error caused by the distance is negligible, and the method can still be implemented according to the technical scheme of the embodiment.
If the central point of the projection lens and the central point of the light beam emitting unit on the direction correcting device are not on the same axis, when the projection lens is corrected, in order to place the position of the projected image at the central point of the projection screen, the central position of the projected image needs to be translated and compensated according to the position difference of the two central points. For example, when the central point of the image capturing unit is 5cm above the central point of the projection lens, after the projection direction is adjusted to be perpendicular to the projection screen, the projection lens needs to be moved upward by 5cm, or the projection screen needs to be moved downward by 5 cm.
Example 2:
in embodiment 1, after the projection direction of the light beam emitting unit, i.e., the direction of the projection lens, is rotated from XP to XP perpendicular to the screen, if the position of the light beam emitting unit and the position of the projection plane are not changed, the center point of the projected image is also shifted from the original center point O of the ellipse 102 to a new projection position (i.e., the center point O of the circle 105). If the position of the central point of the projected image is still expected to be at the point O on the premise of not adjusting the position of the screen and the position of the light beam emitting unit, the position can be adjusted by adjusting the angle of the screen. The specific implementation scheme is as follows:
in order to make the projection direction of the direction correcting device, namely the direction of the projection lens, perpendicular to the projection plane, under the condition that the position of the projection emission device, namely the light beam emission unit is not changed, the image analysis processing unit obtains control information through the following operation method, sends the control information to the screen angle adjusting unit positioned on the projection screen, and adjusts the angle of the screen.
Specifically, firstly, ∠ bab is determined, if ∠ bAB > 0, the screen angle adjustment unit sends a direction correction control signal to the angle adjustment device on the projection screen, so that the projection screen rotates ∠ bAB in the direction of the vector bB around the point O, i.e. onto the plane where the dotted circle 106 in fig. 1b is located (the plane where the dotted circle 106 is located is actually a circle passing the point O and being parallel to and congruent with the circle 101), at which time, the new projection plane is located in the direction perpendicular to the projection direction vector XP (as shown in fig. 2)
If ∠ bAB is less than 0, the adjustment in the opposite direction can be performed by a similar method, which is not described again.
Example 3
The light beam emitting unit described in embodiment 1 may be a point-like laser emitting device that rotates around the rotation axis. At this time, the image acquisition unit further comprises an image information storage unit, which can store the light spot position information of the light beam emission unit acquired by the image acquisition unit at regular intervals and send the related information to the image analysis processing unit. The image analysis processing unit analyzes and calculates the positions of the light spots at different time and synthesizes the motion tracks of the light spots. If the motion trail is a perfect circle, the current projection direction is vertical to the projection screen, and the adjustment is not needed; if the motion trail is an ellipse, the current projection direction is not perpendicular to the projection screen, and the adjustment is needed. The specific adjustment method can be as follows, referring to embodiment 1 and embodiment 2, respectively, and the outer contour of the elliptical projection pattern formed on the projection plane by the light beam in embodiment 1 or embodiment 2 can be replaced by the movement locus of the light spot.
Example 4
The light beam emitting unit described in embodiment 1 may also be two point-like laser emitting devices rotating around the rotation axis, and the two point-like laser emitting devices have equal distances from the rotation center and are respectively located at two end points of one diameter in the rotation trajectory. At this time, the image acquisition unit further comprises an image information storage unit, which can store the light spot position information of the light beam emission unit acquired by the image acquisition unit at regular intervals and send the related information to the image analysis processing unit. The image analysis processing unit analyzes the distances of the two light spots at different times. If the distance between the two points is always equal, the current projection direction is vertical to the projection screen, and adjustment is not needed; if the distance between the two points changes between the maximum value and the minimum value, the current projection direction is not perpendicular to the projection screen, and adjustment is needed. For a specific adjustment method, referring to embodiment 1 or embodiment 2, the outer contour of the elliptical projection pattern formed on the projection plane by the light beam in embodiment 1 or embodiment 2 may be replaced by the movement locus of the light spot.
In addition, the deviation condition of the projection angle can be judged according to the change rule of the distance between the light spots along with the positions of the light spots, and the projection angle can be adjusted.
Example 5
With respect to the above embodiments, when the light emitted by the light beam emitting unit is not parallel light, for example, the light emitted by the light beam emitting unit is in a divergent state, the method in the above embodiments may still be adopted for adjustment. The following description will be made by taking example 1 as an example.
Firstly, the image acquisition unit acquires the light spot information emitted to the projection plane by the light beam emission unit and sends the light spot information to the image analysis processing unit. The image analysis processing unit extracts the shape information of the light spot and constructs an operation model by the following method.
If the light emitted from the light beam emitting unit is divergent and when the projection shape of the vertical cross section of the projection light beam is ring-shaped (it is described that the cross section of the projection light beam is circular or has a point-shaped pattern structure distributed in a ring-shape is similar to this embodiment), the center point of the projection lens is on the same axis as the center point of the light beam emitting unit on the direction correction device, and the projection direction of the light beam emitting unit is the same as the projection lens direction and is not perpendicular or parallel to the projection plane, as shown in fig. 3a, the light emitting position of the light beam emitting unit is a circular ring 301 below in fig. 1, the light spot formed on the projection plane by the light beam emitting unit is an elliptical ring 302 above in fig. 1, the center position is point O, point Ab is the long axis of the ellipse 302, point a is one end point on the long axis of the ellipse 302, and the circle on which the vector Ab is the projection of the projection light beam, referred to as the standard image, vector AB is the projection of vector AB on the above-mentioned plane.
In order to make the projection direction of the light beam emission unit, i.e. the direction of the projection lens, perpendicular to the projection plane, the image analysis processing unit obtains control information by the following calculation method under the condition that the projection plane is not changed, and sends the control information to the direction correction unit to adjust the direction of the projection lens.
Specifically, first, ∠ bAB is determined if ∠ bAB > 0, indicating that the b-point location is behind circle 103 as shown in FIG. 3 a.
The image analysis processing unit sends a direction correction control signal to the direction correction unit, so that the direction XP of the projection lens is rotated by an angle ∠ bAB (until the direction XP is reached) along the direction of the vector bA, that is, the position of the light beam emitting unit is adjusted from 301 to the position of the dashed line ring 304 in fig. 1a, even if the position of the light spot of the light beam projected by the projection lens on the projection plane is the dashed line circle 305, the center point thereof is the point o.
After the direction of the projection lens is rotated from XP to XP, which is perpendicular to the screen, if the position of the projection transmitter and the position of the projection plane are not changed, the center point of the projected image is also shifted from the original center point O of the ellipse 302 to a new projection position (i.e., the center point O of the circle 305). If the central point of the projected image is still expected to be at the point O, the projection lens can be translated on the plane parallel to the projection screen along the direction of the vector oO without adjusting the screen position until the projected central point coincides with the point O.
Example 6
Embodiment 6 provides a projection lens cover, which comprises an image capturing unit. The image acquisition unit and the light beam emission units which are positioned on the projection lens or other positions of the projection emission device and distributed in a ring shape or in a ring shape are used together for correcting the projection direction of the projection emission device according to the method provided by the embodiment. Therefore, the aim of correcting the projection direction of the projection emission device can be fulfilled under the condition that the lens cover is not opened.
Example 7
Embodiment 7 provides a projection lens cover in which light beam emitting units are mounted in a ring shape or a ring-shaped distribution around the center of the projection lens cover. The light beam emission unit, together with an image acquisition unit located on the lens cover or on the projection emission device, corrects the projection direction of the projection emission device according to the method provided in the above embodiment. Therefore, the aim of correcting the projection direction of the projection emission device can be fulfilled under the condition that the lens cover is not opened.
Example 8
Embodiment 8 provides a projection lens cover, wherein a central point of the projection lens cover is a center, and the center is provided with a circular, annular or annularly distributed small hole, and when the projection lens cover is covered on the projection lens and the projection lens projects a light beam, the light beam passes through the small hole to form a light beam with a specific shape. The lens cover, together with the image collecting unit located on the lens cover or the projection emission device, corrects the projection direction of the projection emission device according to the method provided in the above embodiment when the projection lens emits light.
Example 9
Embodiment 9 provides a projection emission device, including the direction correction device in the above embodiment, where the position of the direction correction device and the position of the projection lens are fixed relatively, and the projection direction of the direction correction device is parallel to the projection direction of the projection lens.
When the central point of the projection lens and the central point of the light beam emitting unit on the direction correction device are on the same axis, the projection direction of the direction correction device is adjusted to be perpendicular to the projection screen through the technical scheme in the embodiment, and the purpose of correcting the projection direction of the projection emitting device can be achieved.
When the center point of the projection lens and the center point of the light beam emitting unit on the direction correcting device are not on the same axis, when the projection lens is corrected, in order to place the position of the projected image at the center point of the projection screen, the center position of the projected image needs to be translated and compensated according to the position difference of the two center points. For example, when the central point of the image capturing unit is 5cm above the central point of the projection lens, after the projection direction is adjusted to be perpendicular to the projection screen, the projection lens needs to be moved upward by 5cm, or the projection screen needs to be moved downward by 5 cm.
Example 10
Embodiment 10 provides a projection emission device, including an image acquisition unit and a projection lens. The projection lens can emit a projection image signal with a specific shape, such as a circle with the center point of the image as the center, an annular graphic image or a plurality of discrete point graphic images distributed in an annular shape, or a point graphic image moving around the center point of the image. At this time, the projection direction of the projection lens can be corrected by using the related technical solution provided in the above embodiment.
Example 11
Embodiment 11 provides a projection emission device, including projection emission device, image acquisition unit and beam emission unit, image analysis processing unit and direction correction unit, utilizes the relevant technical scheme that provides in the above-mentioned embodiment, corrects the projection direction of projection emission device.
Example 12
Embodiment 12 provides a projection image rectification system, including a projection emission device, a projection screen, a direction rectification device, and a direction rectification unit, where the direction rectification unit is located on the projection emission device, and can control the pointing direction of a projection lens on the projection emission device according to a direction rectification control signal sent by the image analysis processing unit. The direction correction control signal is obtained according to the related technical scheme provided in the foregoing embodiment.
Example 13
Embodiment 13 provides a projection image rectification system, including projection emitter, projection screen, direction orthotic devices, direction orthotic units is located projection screen, be equipped with screen angle adjustment unit on the projection screen, can adjust the angle of projection screen according to the direction orthotic control signal that image analysis processing unit sent. The direction correction control signal is obtained according to the related technical scheme provided in the foregoing embodiment.
Example 14
Embodiment 14 provides a projection image rectification method, including:
the light beam emission unit projects an image with a certain geometric shape onto a projection plane through the light beam emission unit; the image with certain geometric shape comprises an annular and circular point-shaped graphic structure which is annularly distributed around the central point of the light beam emission unit.
The image acquisition unit acquires image information on a projection plane;
the image analysis processing unit compares the image information with a standard graph according to the related technical scheme provided in the embodiment to obtain a direction correction control signal;
and the direction correction unit corrects the projection angle of the projection lens or the arrangement angle of the projection screen according to the direction correction control signal, so that the projection angle of the projection lens is perpendicular to the projection plane.
Example 15
As shown in fig. 7 to 10, embodiment 15 provides a projector including a lens cover 401 having a small hole 402. One of the small holes 402 may be located near the edge of the lens cover; the lens cover is connected with a driving motor, and the driving motor can drive the lens cover to rotate around a central shaft of the lens cover (as shown in fig. 9); the shape of the small hole 402 may be any plane geometric shape, for example, the small hole may be an arc hole or a circular hole on a circular ring with the center of the lens cover as the center (as shown in fig. 7); the small hole 402 may be only one and is located at the center of the projector lens cover (as shown in fig. 10);
the projector further includes an image capturing unit 403, which may be located at the axial center of the lens cover 401, or at the periphery of the lens cover 401 of the projector (as shown in fig. 10).
The projection lens projects a light beam to the screen through the lens cover 401, and the image capturing unit 403 receives light spot information projected onto the screen by the projection lens.
The projector further comprises an image analysis processing unit, and according to the technical scheme provided in the related embodiment of the invention, the light spot information projected to the projection plane by the light beam emission unit is compared with the standard graph to obtain the direction correction control signal.
The projector can also comprise a direction correction unit which is fixedly connected with the projector lens and used for controlling the direction pointed by the projector lens.
Example 16
Embodiment 16 provides a projector lens cover having a pinhole formed therein, corresponding to embodiment 15.
Particularly, the lens cover further comprises an image acquisition unit, and the image acquisition unit is located at the axis position of the lens cover.
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the present invention, and those skilled in the art can make various modifications and changes. 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 (7)
1. A direction correction device comprises an image acquisition unit and an image analysis processing unit, wherein the periphery of the image acquisition unit is provided with a light beam emission unit, the image acquisition unit receives the light spot position information projected to a projection plane by the light beam emission unit, and the direction correction device also comprises the image analysis processing unit which is used for comparing the image information of the light spot projected to the projection plane by the light beam emission unit with a standard graph to obtain a direction correction control signal; the image acquisition unit receives the light spot position information projected to the projection plane by the light beam emission unit and then sends the light spot position information to the image analysis processing unit; the image acquisition unit also comprises an image information storage unit which stores the light spot position information of the light beam emission unit acquired by the image acquisition unit at regular intervals and sends the related information to the image analysis processing unit; the image analysis processing unit analyzes and calculates the positions of the light spots at different time, and synthesizes the motion tracks of the light spots, wherein the image information of the light spots is the motion tracks.
2. The device of claim 1, further comprising a direction correcting unit fixedly connected to the device whose direction is to be adjusted for controlling the direction pointed by the device whose direction is to be adjusted.
3. The apparatus for correcting direction of claim 2, wherein the light beam emitting unit is a point-like laser emitting device rotating around a rotation axis.
4. The apparatus according to claim 2, wherein the light beam emitting unit is two point laser emitting devices rotating around the rotation axis, and the two point laser emitting devices are located at the same distance from the rotation axis and at two end points of a diameter in the rotation trajectory.
5. The direction correction device according to claim 4, wherein the image analysis processing unit obtains control information according to the distance between two light spots formed by two point-like laser emitting devices at different time under the condition that the projection plane is not changed, and sends the control information to the direction correction unit on the device to be adjusted to adjust the direction of the device to be adjusted; or under the condition that the light beam emitting unit is not changed, the image analysis processing unit obtains control information according to the change condition of the distance between the two point-like laser emitting devices along with the position of the light spot, and sends the control information to the screen angle adjusting unit positioned on the projection screen to adjust the angle of the screen.
6. A projection emission apparatus comprising the direction correction apparatus as claimed in any one of claims 1 to 5.
7. A method of rectification of a projected image, comprising: the light beam emitting unit projects the point laser rotating around the rotating axis onto a projection plane; the image acquisition unit stores the light spot position information of the light beam emission unit acquired by the image acquisition unit at regular intervals, and sends related information to the image analysis processing unit; the image analysis processing unit analyzes and calculates the positions of the light spots at different time, synthesizes the motion tracks of the light spots, and compares the image information of the light spots with a standard graph to obtain a direction correction control signal, wherein the image information of the light spots is the motion tracks; and the direction correction unit corrects the projection angle of the projection lens or the arrangement angle of the projection screen according to the direction correction control signal, so that the projection angle of the projection lens is perpendicular to the projection plane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711304097.5A CN107968938B (en) | 2011-12-28 | 2011-12-28 | Direction correction device, projection emission device and projection image correction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711304097.5A CN107968938B (en) | 2011-12-28 | 2011-12-28 | Direction correction device, projection emission device and projection image correction method |
| CN201110455056.2A CN102572347B (en) | 2011-12-28 | 2011-12-28 | Direction apparatus for correcting, projection emission device, projected image correction system and projection image correcting method |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201110455056.2A Division CN102572347B (en) | 2011-12-28 | 2011-12-28 | Direction apparatus for correcting, projection emission device, projected image correction system and projection image correcting method |
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| CN107968938A CN107968938A (en) | 2018-04-27 |
| CN107968938B true CN107968938B (en) | 2020-02-21 |
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| CN201711304097.5A Active CN107968938B (en) | 2011-12-28 | 2011-12-28 | Direction correction device, projection emission device and projection image correction method |
| CN201110455056.2A Expired - Fee Related CN102572347B (en) | 2011-12-28 | 2011-12-28 | Direction apparatus for correcting, projection emission device, projected image correction system and projection image correcting method |
| CN201711304471.1A Expired - Fee Related CN107786862B (en) | 2011-12-28 | 2011-12-28 | Direction correcting device and projection transmitting device |
| CN201711304472.6A Active CN107911679B (en) | 2011-12-28 | 2011-12-28 | Projection lens cover, projection emission device and projection image correction method |
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| CN201110455056.2A Expired - Fee Related CN102572347B (en) | 2011-12-28 | 2011-12-28 | Direction apparatus for correcting, projection emission device, projected image correction system and projection image correcting method |
| CN201711304471.1A Expired - Fee Related CN107786862B (en) | 2011-12-28 | 2011-12-28 | Direction correcting device and projection transmitting device |
| CN201711304472.6A Active CN107911679B (en) | 2011-12-28 | 2011-12-28 | Projection lens cover, projection emission device and projection image correction method |
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Families Citing this family (12)
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| CN104954714B (en) * | 2015-06-24 | 2017-12-19 | 福州瑞芯微电子股份有限公司 | The back of the hand projecting method and device |
| CN105657388A (en) * | 2015-12-30 | 2016-06-08 | 广东威创视讯科技股份有限公司 | Method for adjusting position of back projector and back projector |
| CN108632585B (en) | 2017-03-24 | 2021-03-09 | 中兴通讯股份有限公司 | Image correction method and device, storage medium and projection equipment |
| CN107896323A (en) * | 2017-11-01 | 2018-04-10 | 海信集团有限公司 | The method of projection arrangement, screen and the position by screen adjustment projection arrangement |
| WO2019227975A1 (en) | 2018-05-30 | 2019-12-05 | Oppo广东移动通信有限公司 | Control system of laser projector, terminal and control method of laser projector |
| CN108767653A (en) * | 2018-05-30 | 2018-11-06 | Oppo广东移动通信有限公司 | Control system and terminal of laser projector and control method of laser projector |
| CN109680969B (en) * | 2018-12-04 | 2021-12-21 | 台州市椒江莱凡特眼镜厂 | Spherical screen adjusting method and adjusting system |
| CN114967109B (en) * | 2021-02-25 | 2024-01-05 | 成都理想境界科技有限公司 | Image correction method and optical fiber scanning imaging system |
| US20240264461A1 (en) * | 2021-05-12 | 2024-08-08 | Cineappo Laser Cinema Technology (Beijing) Co., Ltd | Stereoscopic projection device |
| CN113433789A (en) * | 2021-05-12 | 2021-09-24 | 中影光峰激光影院技术（北京）有限公司 | Stereoscopic projection device |
| CN113390366B (en) * | 2021-06-25 | 2022-10-11 | 上海工程技术大学 | Method for judging perpendicularity of optical axis of camera and cambered surface hole cutting plane and verification platform |
| CN114640791B (en) * | 2022-01-27 | 2024-09-13 | 浙江大华技术股份有限公司 | Lens angle adjusting method, device, computer equipment and camera |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN107911679B (en) | 2020-11-03 |
| CN107968938A (en) | 2018-04-27 |
| CN102572347B (en) | 2018-02-13 |
| CN107911679A (en) | 2018-04-13 |
| CN102572347A (en) | 2012-07-11 |
| CN107786862B (en) | 2020-04-07 |
| CN107786862A (en) | 2018-03-09 |
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