CN113141491B

CN113141491B - Projection method, system and storage medium based on monochromatic light reference line emitter

Info

Publication number: CN113141491B
Application number: CN202110337637.XA
Authority: CN
Inventors: 李志�; 金凌琳; 林绵发
Original assignee: Shenzhen Dangzhi Technology Co ltd
Current assignee: Shenzhen Dangzhi Technology Co ltd
Priority date: 2020-12-03
Filing date: 2020-12-03
Publication date: 2022-06-10
Anticipated expiration: 2040-12-03
Also published as: CN112203070A; CN113141491A; CN112203070B

Abstract

The application discloses a projection method, a projection system and a computer-readable storage medium based on a monochromatic light reference line emitter, wherein the method comprises the steps of determining the frame body size of a reference rectangular frame to be projected by the monochromatic light reference line emitter according to a third distance; controlling the monochromatic light reference line emitter to project a reference rectangular frame with the frame size to the projection surface; controlling the two optical machines to respectively project splicing calibration images to the projection surface, and detecting whether the initial positions of the two splicing calibration images are both in the reference rectangular frame; if the initial positions are not in the reference rectangular frame, controlling the monochromatic light reference line emitter to project splicing boundary reference lines to the projection plane according to the space coordinates of the first normal; adjusting the projection angle of the optical machine until the two spliced calibration images are spliced seamlessly at the reference line of the splicing boundary; and performing trapezoidal correction on the two optical machines, and controlling the two optical machines to project images to be displayed respectively to the projection surface. The application improves the overall effect of the effective projection picture of the wide-screen projection system.

Description

Projection method, system and storage medium based on monochromatic light reference line emitter

Technical Field

The present application relates to the field of projection display technologies, and in particular, to a projection method and system based on a monochromatic light reference line emitter, and a computer-readable storage medium.

Background

With the development of science and technology, projection equipment is increasingly popularized in offices, multifunctional meeting rooms and home theaters, at present, projection equipment or a projection system generally uses a single optical machine to output a single optical path for projection, and in the projection direction, the projection area is limited by the projection distance, the physical imaging characteristics of the optical machine, trapezoidal correction of images and the like.

When the projection apparatus or the projection system is in side projection, the actually displayed projection image is scaled down and corrected due to the effect of the image trapezoidal correction factor, so that the appearance is impaired, and the larger the side projection angle is, the smaller the projection area of the actually displayed image is. Particularly, when the projection displays a large-width image, the actual display projection picture can only be scaled down under the condition of keeping a high width and a high proportion, which is reflected in that the upper black edge and the lower black edge of the projection are very large, the projection area of the actual display image is small, and the overall effect of the effective projection picture is poor.

The above is only for the purpose of assisting understanding of the technical solutions of the present application, and does not represent an admission that the above is prior art.

Disclosure of Invention

The embodiments of the present application mainly aim to provide a projection method, a system and a computer readable storage medium based on a monochromatic light reference line emitter, which aim to solve the technical problems of a conventional projection device or system that the actual display image projection area is small and the overall effect of an effective projection picture is poor.

To achieve the above object, embodiments of the present application provide a projection method based on a monochromatic light reference line emitter, the projection method based on the monochromatic light reference line emitter is applied to a wide-screen projection system, the wide-screen projection system comprises two photomasks arranged on the same plane, a camera and the monochromatic light reference line emitter, the camera is arranged on a plane which is vertical to a connecting line between the two optical machines and is determined by the center of the connecting line, the center of the monochromatic light reference line emitter is positioned on a vertical plane defined by the center of the camera and the midpoint of the connecting line of the two optical machines, distance sensors are respectively arranged on the optical machine and the camera, a gyroscope sensor is arranged on the monochromatic light reference line emitter, the camera, the gyroscope sensor and the monochromatic light reference line emitter are fixed on a base plane, and a projection surface is arranged in the shooting direction of the camera;

the projection method based on the monochromatic light reference line emitter comprises the following steps:

when the ray machines are detected to be powered on, based on the distance sensor, a first distance from one ray machine to the projection surface, a second distance from the other ray machine to the projection surface and a third distance from the camera to the projection surface are obtained, and a first normal passing through the position of the camera and perpendicular to a vertical plane of a connecting line of the two ray machines is determined;

deducing and judging whether the projection plane is parallel to a vertical plane where the two optical-mechanical connecting lines are located according to the first distance, the second distance and the third distance, and further judging whether the projection system is in a plane forward projection state;

if the projection system is in a plane orthographic projection state, determining the frame body size of the reference rectangular frame to be projected by the monochromatic light reference line emitter according to the third distance;

when the gyroscope sensor detects that the monochromatic light reference line emitter is in a horizontal state, the monochromatic light reference line emitter is controlled to project a reference rectangular frame with the size of the frame body to the projection surface;

controlling the two optical machines to respectively project spliced calibration images to a projection surface, and detecting whether the initial positions of the two spliced calibration images are both in the reference rectangular frame;

if the initial positions are not in the reference rectangular frame, acquiring the space coordinate of a first normal line passing through the position of the camera and perpendicular to the plane where the optical machine is located, and controlling the monochromatic light reference line emitter to project the splicing boundary reference line to the projection plane according to the space coordinate of the first normal line;

adjusting the projection angle of the optical machine until the two spliced calibration images are spliced seamlessly at the spliced boundary reference line;

and performing trapezoidal correction on the two optical machines, and controlling the two optical machines to project images to be displayed respectively to the projection surface.

Optionally, the step of adjusting the projection angle of the optical machine until the two stitching calibration images are seamlessly stitched at the stitching boundary reference line includes:

adjusting the projection angles of the two optical machines in a preset initial steering mode, and respectively detecting the boundary distances between the two opposite longitudinal boundaries of the two spliced calibration images and the spliced boundary reference line in real time;

reversing the preset initial steering of the first optical machine with the boundary distance gradually increased, and adjusting the projection angle of the first optical machine by the reversed steering until the longitudinal boundary of the splicing calibration image of the first optical machine is seamlessly spliced with the reference line of the splicing boundary;

and keeping the preset initial steering of the second optical machine with the gradually reduced boundary distance, and adjusting the projection angle of the second optical machine until the longitudinal boundary of the splicing calibration image of the second optical machine is seamlessly spliced with the reference line of the splicing boundary.

Optionally, after the step of detecting whether the initial positions of the two stitched calibration images are both within the reference rectangular frame, the method further includes:

if the initial positions are all in the reference rectangular frame, detecting whether the two spliced calibration images have an overlapping area;

if the overlapped area exists, the included angle of the light outgoing directions of the two optical machines is increased; if no overlapping area exists, the included angle of the light emitting directions of the two optical machines is reduced;

in the process of adjusting the included angle, whether the two longitudinal boundaries of the spliced calibration image are overlapped or not is judged based on an image edge recognition algorithm; and if the two longitudinal boundaries are overlapped, judging that the two spliced calibration images are spliced seamlessly, and stopping the rotation of the two optical machines.

Optionally, the projection method based on the monochromatic light reference line emitter further comprises:

after seamless splicing of the two spliced calibration images is detected, detecting the number of transverse pixels and the number of longitudinal pixels of the overall image after seamless splicing of the two spliced calibration images;

after the splicing calibration images are detected to be overlapped relative to the two longitudinal boundaries, the camera collects the two splicing calibration images after the boundaries are overlapped again, and then the number of transverse pixels and the number of longitudinal pixels of the overall image after the two splicing calibration images are seamlessly spliced are detected;

calculating and acquiring the approximate resolution of the overall image relative to the actual resolution according to the number of the transverse pixels and the number of the longitudinal pixels;

comparing the approximate resolution with a preset resolution of the two optical machine projection images;

if the difference between the approximate resolution and the preset resolution is within a threshold value, outputting a complete prompt of the wide-screen projection;

if the difference between the approximate resolution and the preset resolution exceeds a threshold value, prompting a user to adjust the position of the projector or the position of the projection surface through a voice or projection interface and then carrying out splicing calibration again until the difference between the approximate resolution and the preset resolution is within the threshold value.

Optionally, the optical machine and the camera are arranged on the base, a horizontal rotating shaft is arranged on one side of the base, which is far away from the optical machine, the axial direction of the horizontal rotating shaft is parallel to the lighting direction of the camera,

after the step of determining the frame body size of the reference rectangular frame to be projected by the monochromatic light reference line emitter according to the third distance:

when detecting that the monochromatic light reference line emitter is in an inclined state based on the gyroscope sensor, the horizontal rotating shaft is driven to drive the base to rotate, and the monochromatic light reference line emitter is adjusted to be horizontal.

Optionally, after the step of comparing the first distance and the second distance, the method further includes:

if the first distance is not equal to the second distance, judging that the projection surface is inclined, and guiding a user to adjust the position of the projection surface or adjust the position of the projector through an interface;

if the user selects to adjust the position of the projection surface, the step of detecting whether the connecting line of the two optical machines is parallel to the projection surface in the shooting direction of the camera is executed after the user finishes the adjustment;

if the user selects the projector to automatically adjust, the horizontal rotating shaft bearing the lower parts of the two optical machine bases is controlled to rotate and adjust in the left-right direction until the connecting line of the two optical machines is parallel to the projection plane.

Optionally, the wide-screen projection system further comprises a focusing motor, the focusing motor is disposed at the lens of the optical engine,

before the step of controlling the two optical machines to respectively project and splice the calibration images to the projection surface, the method further comprises the following steps of:

controlling the two optical machines to project a focal length calibration image to the projection surface;

and controlling a focusing motor to adjust the focal lengths of the two optical machines based on the definition of a focal length calibration image dynamically acquired by the camera until the definition reaches a preset definition threshold value.

Optionally, after the step of obtaining a first distance from one optical machine to the projection surface, a second distance from another optical machine to the projection surface, and a third distance from the camera to the projection surface based on the distance sensor, the method further includes:

if the instruction of canceling the wide-screen projection is detected, detecting the current projection brightness requirement of the wide-screen projection system;

if the current projection brightness requirement is larger than or equal to a preset brightness threshold value, controlling the two optical machines to project splicing calibration images to the area, perpendicular to the projection surface, in the shooting direction of the camera until the two splicing calibration images are completely overlapped;

and performing trapezoidal correction on the two optical machines, and controlling the two optical machines to project the same image to be displayed to the projection surface.

In order to achieve the above object, the present application further provides a wide-screen projection system, which includes two optical machines disposed on the same plane, a camera, a red light emitter, a memory, a processor, and a computer program stored in the memory and running on the processor, the camera is positioned on a plane which is vertical to a connecting line between the two optical machines and is determined by the center of the connecting line, the center of the monochromatic light reference line emitter is positioned on a vertical plane determined by the center of the camera and the midpoint of the connecting line of the two optical engines, the optical machine and the camera are respectively provided with a distance sensor, the camera, the gyroscope sensor and the monochromatic light reference line emitter are fixed on a base plane, and a projection surface is arranged in the shooting direction of the camera, and the computer program realizes the steps of the projection method based on the monochromatic light reference line emitter when being executed by the processor.

To achieve the above object, the present application further provides a computer-readable storage medium having a computer program stored thereon, which, when being executed by a processor, performs the above steps of the projection method based on a monochromatic light reference line emitter.

In the embodiment of the application, wide screen projection is realized by arranging two photomasks, when a first distance from one photomask to a projection surface is detected to be equal to a second distance from the other photomask to the projection surface, when the shooting direction of a camera is perpendicular to the projection surface, a third distance from the camera to the projection surface is detected, the frame body size of a reference rectangular frame with the adaptive red light attribute is determined according to the third distance, the reference rectangular frame with the frame body size is controlled to be projected to the projection surface by a monochromatic light reference line emitter when the monochromatic light reference line emitter is in a horizontal state, then the two photomasks project spliced calibration images to the projection surface, when the initial positions of the two spliced calibration images are not in the reference rectangular frame, the deviation existing in the projection positions of the photomasks is large, at the moment, the monochromatic light reference line emitter is controlled to project spliced boundary reference lines (the orthographic projection of a first normal line in the projection) to the projection surface, because the light inlet and outlet directions of the camera and the monochromatic light reference line emitter are vertical to the projection plane, the splicing boundary reference line is the final position of seamless splicing of two splicing calibration images, the projection angle of the optical machines is adjusted according to the position relation between the two splicing calibration images and the splicing boundary reference line until the two splicing calibration images are seamlessly spliced at the splicing boundary reference line, finally the two optical machines are subjected to trapezoidal correction, and the two optical machines are controlled to project images to be displayed to the projection plane, so that the two optical machines jointly output projection pictures output by a single optical machine in a conventional scheme, the widths of the projection pictures respectively output by the two optical machines are shortened, even if the projection pictures with the shortened single width are reduced through trapezoidal correction under the condition that the optical machines are in side projection, or in wide-screen display, in order to keep the equal ratio of the high ratio of the width to be reduced, the two reduction processes are influenced by the common equal ratio of the projection pictures of the two optical machines, therefore, the amplitude of the actual projection picture for reducing in equal proportion can be greatly reduced, the problems that the upper and lower black edges of the projection are large and the projection area of the actual display image is small are solved, and the overall effect of the effective projection picture of the wide-screen projection system is improved.

Drawings

FIG. 1 is a schematic view of a wide-screen projection system according to the present application;

FIG. 2 is a schematic view of another embodiment of a wide screen projection system according to the present invention;

FIG. 3 is a schematic view of the orientation and reference line layout of an embodiment of a projection screen in a widescreen projection system according to the present application;

FIG. 4 is a schematic flowchart of an embodiment of a projection method based on a monochromatic light reference line emitter according to the present application;

FIG. 5 is a schematic flow chart illustrating a projection method based on a monochromatic light reference line emitter according to another embodiment of the present invention;

FIG. 6 is a schematic view of a scene in which a stitched calibration image is not located within a reference rectangular frame in the projection method based on a monochromatic light reference line emitter according to the present invention.

The reference numbers illustrate:

the implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.

Detailed Description

It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.

The technical solutions in the embodiments of the present application will be described clearly and completely with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only some embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that all the directional indications (such as up, down, left, right, front, and rear … …) in the embodiment of the present application are only used to explain the relative position relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indication is changed accordingly.

In this application, unless expressly stated or limited otherwise, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In addition, descriptions in this application as to "first", "second", etc. are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit to the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present application.

In an embodiment of the present application, referring to fig. 1 and 2, a wide-screen projection system includes: the optical machine comprises two optical machines 1, a camera 2, a circuit board 3 and a base 4, wherein the optical machines 1 are arranged on the base 4 at intervals, a driving assembly for driving the optical machines 1 to rotate is arranged on the base 4, the camera 2 is arranged on the base 4 between the two optical machines 1, the arrangement positions of the camera 2 are arranged on the middle point of the connecting line of the arrangement positions of the two optical machines 1, the camera 2 is used for collecting various calibration images output by the optical machines 1, and the calibration images comprise splicing calibration images and focal length calibration images; the models of the two optical machines 1 are generally the same, that is, the projection optical parameters of the two optical machines 1 are basically the same, the base 4 mainly plays a role in installation and support, the optical machines 1 are movably installed on the base 4 at intervals, the optical machines 1 are driven by the driving assembly to rotate on the plane where the base 4 is located, the light emitting direction of the optical machines 1 is adjusted, and therefore the projection area position of the optical machines 1 on the projection screen 8 is adjusted. The camera 2 is mainly used for collecting image content projected to the projection screen 8 by the optical machine 1, the image content may be a calibration image for projection calibration of the optical machine 1, or a projection picture generated by cutting a to-be-displayed image projected by the optical machine 1, generally speaking, in order to facilitate the camera 2 to accurately collect the image content, the camera 2 is arranged on the base 4 between the two optical machines 1 and is positioned at a midpoint between the two optical machines 1, thereby reducing horizontal deviation of the image content projected by the optical machine 1 as much as possible, improving accuracy of the image content collected by the camera 2, and further improving accuracy of data analysis of the image processing chip 5 and the optical machine driving chip 6.

Referring to fig. 2, a processor is arranged on the circuit board 3, and the processor comprises an image processing chip 5 and an optical drive chip 6 which are in communication connection with each other; the image processing chip 5 is in communication connection with the optical machine 1, and controls the optical machine 1 to output splicing calibration images respectively by receiving image data and logic control signals of the image processing chip 5; the image processing chip 5 is respectively in communication connection with the optical machine driving chip 6, the driving assembly and the camera, so that the driving assembly is controlled to adjust an included angle P formed by the light emitting directions of the two optical machines 1 based on the splicing calibration images acquired by the camera 2, and the adjacent boundaries of the two splicing calibration images are connected; after the two splicing calibration images are connected, the optical-mechanical driving chip 6 informs the image processing chip 5 to control the optical-mechanical 1 to output respective projection images, wherein the projection images are obtained by proportionally splitting the images to be displayed by the image processing chip 5 according to the width proportion of the splicing calibration images.

The circuit board 3 is generally disposed on the base 4 and spaced from the optical machine 1, that is, the circuit board 3 is disposed above one side of the base 4 where the optical machine 1 is mounted, a bracket can be disposed between the circuit board 3 and the base 4, the circuit board 3 is fixedly connected with the bracket, and the height of the bracket is greater than that of the optical machine 1, so that the circuit board 3 and the optical machine 1 are disposed at intervals. Optionally, because ray apparatus 1 power is great, and the heat production is more, and the heat dissipation problem is outstanding, can set up the fin in circuit board 3 towards ray apparatus 1 one side, and the radiating fin one end is connected circuit board 3, one end and is connected ray apparatus 1 radiating piece or neighbouring ray apparatus 1 louvre to effectively utilize the region between circuit board 3 and the ray apparatus 1, increase heat radiating area improves the radiating efficiency of ray apparatus 1.

The image processing chip 5 and the optical engine driving chip 6 are both solid chips installed on the circuit board 3, and the image processing chip 5 is mainly used for controlling the optical engine 1 to output images, for example, splitting the images to be displayed and controlling the optical engine 1 to respectively display the split images based on an external instruction. The optical machine driving chip 6 is mainly used for adjusting the light emitting direction of the optical machine 1, the inclination angle of the plane where the optical machine 1 is located and the focal length of the optical machine 1, and the optical machine driving chip 6 is in communication connection with the first motor 71, the second motor 91 and the focusing motor 10.

In this embodiment, referring to fig. 2 and 3, the image processing chip 5 controls the optical machines 1 to output the splicing calibration images to project onto the projection screen 8, the camera 2 continuously collects the projected splicing calibration images, the optical machine driving chip 6 analyzes the splicing calibration images collected by the camera 2, the driving module is controlled to adjust the included angle P formed by the light emitting directions of the two optical machines 1, the adjacent boundaries (two longitudinal boundaries perpendicular to and opposite to the transverse direction of the projection screen 8) of the two splicing calibration images, when the distance between the adjacent boundaries of the two splicing calibration images is too large, the driving module is controlled to decrease the included angle P formed by the light emitting directions of the two optical machines 1, when the distance between the adjacent boundaries of the two splicing calibration images is too small, the driving module is controlled to increase the included angle P formed by the light emitting directions of the two optical machines 1 until the adjacent boundaries of the two splicing calibration images are connected, at this time, the image processing chip 5 judges the relative positions of the two mosaic calibration images based on the two mosaic calibration images acquired by the camera 2 (if trapezoidal correction is completed before the mosaic calibration, the transverse width ratio obtained by analysis is 1:1, for example, the width ratio of the mosaic calibration images output by the two optical machines 1 is 1:1, namely, the two optical machines 1 output images with equal size, if the trapezoidal correction is performed after the mosaic calibration, the left and right projection screens project single-tone pictures with different whole screens, and the mosaic calibration is performed by detecting the colors of the adjacent areas of the two projection pictures), then the image processing chip 5 controls the optical machines 1 to output the projection pictures obtained by dividing and cutting the images to be displayed according to the width ratio, so that the two optical machines 1 output the projection pictures output by a single optical machine 1 in the conventional scheme together, and the amplitude of equal-scale reduction of actual projection pictures when a single optical machine system displays wide-screen images is reduced, the problems that the upper black edge and the lower black edge are large and the actual projection area of the displayed image is small during full-screen projection are solved, and the overall effect of an effective projection picture of the wide-screen projection system is improved.

Further, in another embodiment of the wide screen projection system, the driving assembly includes a first motor 71, a first mounting table 72 and a second mounting table 73, the first motor 71 is in communication connection with the optical engine driving chip 6, the first mounting table 72 and the second mounting table 73 are circular gears, the first mounting table 72 and the second mounting table 73 are axially and rotatably connected to the base 4 in a direction perpendicular to the base 4, two vertical rotating shafts can be arranged in the middle of the first mounting table 72 and the second mounting table 73 in a penetrating manner, the first mounting table 72 and the second mounting table 73 rotate around the vertical rotating shafts, the two optical engines 1 are respectively mounted on the sides of the first mounting table 72 and the second mounting table 73 away from the base 4, the optical engines 1 can synchronously rotate along with the rotation of the first mounting table 72 and the second mounting table 73, the lateral outer edges of the first mounting table 72 and the second mounting table 73 are provided with interlocking gear teeth, that is, the first mounting table 72 and the second mounting table 73 are themselves circular gears, the first mounting table 72 and the second mounting table 73 are engaged with the driving gear 711 of the first motor 71, and when the light emitting direction of the optical machine 1 needs to be adjusted, the first motor 71 controls the driving gear 711 to drive the first mounting table 72 and the second mounting table 73 to rotate, so that the light emitting directions of the two optical machines 1 are adjusted, and adjacent boundaries of two spliced calibration images output by the optical machines 1 are controlled to be connected.

Preferably, the first mounting table 72 and the second mounting table 73 are gear members having the same size and are engaged with each other, and the driving gear 711 of the first motor 71 is engaged with the first mounting table 72 or the second mounting table 73. Namely, the gear teeth of the first mounting table 72 and the second mounting table 73 are meshed and linked, the driving gear 711 of the first motor 71 only needs to be meshed with any one of the first mounting table 72 or the second mounting table 73, so that the first motor 71 drives the first mounting table 72 and the second mounting table 73 to synchronously rotate, the rotating directions of the light emitting directions of the two optical machines 1 are opposite, and the rotating amplitudes of the two optical machines will be consistent, the problem that a single splicing calibration image moves too fast and too much is not easy to occur in the splicing calibration image splicing process, the width ratio of the two splicing calibration images is effectively kept unchanged, the method is particularly suitable for the splicing high-precision adjustment situation that the width ratio of the splicing calibration image of the two optical machines 1 is 1:1, and the splicing efficiency and the splicing precision of adjacent boundaries of the splicing calibration image are improved. Certainly, the number of the first motors 71 can be two according to needs, the two first motors 71 respectively and independently drive the first mounting table 72 and the second mounting table 73 (at this time, the two mounting tables are separated), that is, the projection angles of the two optical machines can be independently adjusted, for some high-precision projection scenes with special requirements, a user needs to independently adjust the projection angles of the two optical machines 1, and the multi-scene projection requirements of the wide-screen projection system are met.

Optionally, the camera 2 is disposed on an angular bisector of an included angle P formed between the light emitting directions of the two optical machines 1, that is, the camera 2 is disposed at a midpoint position of a connecting line between the two optical machines 1, the wide-screen projection system further includes a projection screen 8 (i.e., a projection plane) located in the light emitting directions of the two optical machines 1, and the light emitting direction of the camera 2 is perpendicular to the projection screen 8. Camera 2 sets up on the angular bisector, camera 2's daylighting direction can be parallel with the angular bisector or coincide, and wide screen projection system's projection screen 8 sets up the dead ahead at camera 2, does not shelter from between camera 2 and the projection screen 8, thereby camera 2's light-emitting direction is perpendicular with projection screen 8, the lateral deviation can reduce as far as possible to the projected image on camera 2 gathers projection screen 8, improve camera 2 and gather the precision of concatenation calibration image, further promote the concatenation efficiency and the concatenation precision on the adjacent border of concatenation calibration image. In addition, under the structure that the projection angles of the two optical machines 1 are independently adjusted, the camera 2 is disposed at the midpoint between the two optical machines 1.

Further, in another embodiment of the wide-screen projection system, the wide-screen projection system further includes a physical horizontal angle calibration, which includes a second motor 91 and a horizontal rotating shaft 92, the second motor 91 is in communication connection with the optical engine driving chip 6, the horizontal rotating shaft 92 is fixedly connected with the horizontal adjusting surface 11 of the base 4, the second motor 91 drives the horizontal rotating shaft 92 to rotate so as to drive the horizontal adjusting surface 11 of the base 4 to rotate along with the horizontal rotating shaft 92, a fixedly connected portion of the horizontal rotating shaft 92 and the base 4 is the horizontal adjusting surface 11 of the plate-shaped member, the horizontal adjusting surface 11 can be fixedly connected with a side of the base 4 away from the optical engine 1, because there is no rotating space between the base 4 and the horizontal adjusting surface 11, the horizontal adjusting surface 11 and the base 4 do not move relatively, so that the second motor 91 drives the horizontal rotating shaft 92 to drive the base 4 to rotate more accurately, and the base 4 is placed on the inclined supporting surface on the base 4 where the optical engine 1 is located, Or the base 4 itself is not horizontal, or the base 4 is placed irregularly, resulting in the inclination of the base 4, and further resulting in the inclination of the light emitting direction of the optical machine 1 rather than the horizontal. Specifically, as shown in fig. 2, the base 4 includes a vertical horizontal adjustment base 12 and a horizontal adjustment surface 11, and the horizontal adjustment surface 11 is disposed on the vertical horizontal adjustment base 12. Therefore, after the adjacent boundaries of the calibration picture are connected, the second motor 91 drives the horizontal rotating shaft 92 to rotate so as to drive the base 4 to rotate, the image processing chip 5 controls the optical machine to output horizontal calibration images respectively, the optical machine driving chip 6 analyzes the horizontal calibration images acquired by the camera 2 synchronously, when the horizontal calibration image level is judged, namely, the plane included angle P of the planes where the two optical machines 1 are located is adjusted to be 0 degree, the planes where the two optical machines 1 are located are in a horizontal state, the second motor 91 is controlled to stop rotating, and therefore the projection of the optical machine 1 is ensured to meet the horizontal requirement. In addition, wide screen projection system still includes the gyroscope sensor that sets up on base 4, and ray apparatus drive chip 6 controls horizontal pivot 92 to rotate based on the data acquisition of gyroscope sensor to adjust two ray apparatus 1 place planes to the horizontality.

Optionally, horizontal rotating shaft 92 sets up in the one side that base 4 deviates from ray apparatus 1, the axial of horizontal rotating shaft 92 is parallel with the daylighting direction of camera 2, because the axial of horizontal rotating shaft 92 is unanimous in the daylighting direction of camera 2, then the axial perpendicular to projection screen 8 of horizontal rotating shaft 92, in the rotation process of horizontal rotating shaft 92, ensure that the turned angle of two ray apparatus 1 is unanimous, ensure that the light-emitting direction contained angle P of two ray apparatus 1 is unchangeable, when promoting wide-screen projection system's effective projection picture wholeness effect, avoid effective projection picture to appear the side to move. In addition, the preferred level of flattening of installation face of first mount table 72 and second mount table 73 is, and two ray apparatus 1 are in same horizontal plane to when horizontal rotating shaft 92 drove base 4 and rotates, two ray apparatus 1 are unanimous along with pivoted turned angle, have reduced the adjustment degree of difficulty that ray apparatus 1 adjusted to the horizontal plane, have further promoted the debugging efficiency before carrying out effective projection.

Further, referring to fig. 2 and 3, a reference mark is arranged on the side of the projection screen 8 facing the camera 2, the reference mark comprises a horizontal reference line, a vertical reference line and a splicing boundary reference line, the horizontal width extending direction of the horizontal calibration image should be parallel to the horizontal reference line, the longitudinal width extending direction of each type of calibration image (horizontal, splicing and focus calibration images) should be parallel to the vertical reference line, the splicing line when the adjacent boundaries of the two splicing calibration images are connected should coincide with the splicing boundary reference line, therefore, the reference mark can assist the optical-mechanical drive chip 6 in judging whether splicing of the spliced calibration images is completed or not and whether the plane where the optical-mechanical 1 is located (namely the horizontal calibration image) is located at the horizontal plane or not, and compared with the optical-mechanical drive chip 6 which is only analyzed according to the acquired image data of the camera 2, the calculation amount is less and the calculation efficiency is higher.

Optionally, the wide-screen projection system further includes a focusing motor 10, the focusing motor is in communication connection with the optical engine driving chip 6, and the focusing motor 10 is disposed at the lens of the optical engine 1 to adjust the focal length of the optical engine 1. Therefore, after the splicing calibration image is spliced and the plane of the optical machine 1 is horizontally calibrated (the horizontal calibration image is horizontal), the image processing chip 5 can control the optical machine 1 to respectively project two focal length calibration images, and control the respective focusing motors 10 of the two optical machines 1 to respectively adjust the focal lengths of the two optical machines 1, so that a clear projection effect is obtained. Finally, the image processing chip 5 cuts the image to be displayed in proportion according to the width proportion of the two projection areas after the trapezoidal correction, and then sends the image to the respective optical machines 1 for projection display.

The application also provides a projection method based on the monochromatic light reference line emitter, which is applied to a wide-screen projection system, the wide-screen projection system comprises two photomasks arranged on the same plane, a camera and the monochromatic light reference line emitter, the camera is positioned on a plane which is vertical to a connecting line between the two photomasks and is determined by the center of the connecting line, the center of the monochromatic light reference line emitter is positioned on a vertical plane defined by the center of the camera and the midpoint of the connecting line of the two optical machines, distance sensors are respectively arranged at the positions of the optical machine and the camera, such as a camera position distance sensor 13 and an optical machine position distance sensor 15 in figures 1 and 2, a gyroscope sensor is arranged on the red light ray emission 14, the camera, the gyroscope sensor and the monochromatic light reference line emitter are fixed on a base plane, and a projection plane is arranged in the shooting direction of the camera; referring to fig. 4, the projection method based on the monochromatic light reference line emitter includes:

step S10, when detecting the ray machines are electrified, based on the distance sensor, obtaining a first distance from one ray machine to the projection surface, a second distance from the other ray machine to the projection surface and a third distance from the camera to the projection surface, and determining a first normal line passing through the position of the camera and perpendicular to a vertical plane of a connecting line of the two ray machines; and comparing the first distance and the second distance;

the monochromatic light color of the monochromatic light reference line emitter is not limited, and the monochromatic light color is different from the color of the calibration image and is beneficial to the collection of a camera.

The wide-screen projection system can comprise two optical machines, a camera, a distance sensor, a circuit board and a base, wherein the two optical machines and the camera are arranged on the base and are positioned on the same plane, the two optical machines are arranged on the base at intervals, a driving assembly for driving the optical machines to rotate to adjust the projection angle is arranged on the base, and the camera is arranged on the base between the two optical machines to collect various calibration images output by the optical machines. The circuit board is provided with a processor, and the processor comprises an image processing chip and an optical machine driving chip which are in communication connection with each other. The camera is arranged at the middle point of the connecting line between the two optical machines, the distances from the orthographic projection positions of the camera shooting direction to the projection plane to the projection images of the two optical machines are basically equal, and the orthographic projection positions of the two optical machines relative to the camera are symmetrical, so that the projection angles of the optical machines are adjusted in a symmetrical relation, and the adjustment difficulty of the projection angles of the optical machines can be further simplified.

After detecting the ray apparatus and electrifying, whether two ray apparatus setting position connecting lines are parallel to the projection surface or not needs to be detected, two distances from the two ray apparatuses to the projection surface can be detected and compared to judge, and distance sensors can be respectively arranged on the two ray apparatuses to respectively measure a first distance from one ray apparatus to the projection surface and a second distance from the other ray apparatus to the projection surface. The distance sensor of the present embodiment generally measures the distance based on the "flying time method", and calculates the distance to the object by measuring the time interval by emitting a light pulse that is extremely short and measuring the time from the emission to the reflection of the light pulse by the object. The distance sensor can be divided into various optical distance sensors, red light distance sensors, ultrasonic distance sensors and the like according to the difference of the working principle of the distance sensor, so that a first distance from one optical machine to the projection surface, a second distance from the other optical machine to the projection surface and a third distance from the camera to the projection surface are detected and acquired based on the distance sensors arranged at the optical machine and the camera.

Step S20, comparing the first distance and the second distance to deduce and judge whether the projection plane is parallel to the vertical plane where the two optical-mechanical connecting lines are located, and further judge whether the projection system is in a plane normal projection state; if the projection system is in a plane forward projection state, determining the frame body size of a reference rectangular frame to be projected by the monochromatic light reference line emitter according to the third distance;

if the first distance is equal to the second distance, the projection system is in a plane normal projection state, and the size of a frame body of a reference rectangular frame to be projected by the monochromatic light reference line emitter is determined according to the third distance;

when the first distance and the second distance are detected to be equal, the projection system is in a plane forward projection state, and the distances between the optical machines which are arranged on the same connecting line at intervals and the projection plane are equal, namely the connecting line of the two optical machines is parallel to the projection plane, and the shooting direction of the camera (namely the light incidence direction of the camera) is vertical to the projection plane; when the first distance and the second distance are detected to be unequal, the projection surface is shown to be inclined relative to the two optical machine connecting lines, and the connecting lines of the two optical machines are not parallel to the projection surface, so that the distance measurement of the distance sensor and the setting of the positions of the optical machines and the camera are used, the judgment of whether the projection surface is parallel to the connecting lines is simply and accurately realized, and the analysis of the size, the inclination angle and the like of the projected image optical machine is not required to be complicated.

When the line of two ray apparatus is parallel with the plane of projection, the plane of projection is perpendicular with the camera direction of shooting, and wherein the camera direction of shooting can be the income light direction of camera, and the camera just is to the plane of projection, avoids leading to gathering the image deformation on the plane of projection because the camera deflects, need not to carry out the recalibration to the image that the camera was gathered, and then improves the collection efficiency and the collection precision that the camera gathered the image on the plane of projection.

Meanwhile, when the connecting line of the two photomasks is parallel to the projection surface, the camera shooting head is over against the projection surface, and the light emitting direction of the monochromatic light reference line emitter arranged at the camera is also perpendicular to the projection surface, so that the monochromatic light reference line emitter can project a reference rectangular frame to the projection surface, and the monochromatic light reference line emitter is closed after correction.

According to the optical machine projection light path structure and principle, the larger the first distance between the optical machine and the projection surface is, the larger the projection image size projected to the projection surface by the optical machine is, so that the reference rectangular frame is matched with the size of the projection image, the projection system structure is fixed, the difference value between the first distance and the third distance can be obtained through geometric calculation, namely the first distance and the third distance have a fixed relation due to the fixed structure, therefore, the frame size of the reference rectangular frame to be projected by the monochromatic light reference line emitter can be determined according to the third distance, wherein the larger the first distance is, the larger the frame size of the reference rectangular frame is.

Step S30, when the gyro sensor detects that the monochromatic light reference line emitter is in a horizontal state, the monochromatic light reference line emitter is controlled to project a reference rectangular frame with the frame size to the projection surface; controlling the two optical machines to respectively project spliced calibration images to the projection surface, and detecting whether the initial positions of the two spliced calibration images are both in the reference rectangular frame;

the monochromatic light reference line emitter and the gyroscope sensor are fixed on the same base plane to detect whether the plane where the monochromatic light reference line emitter is located is horizontal or not, if the monochromatic light reference line emitter is detected to be in a horizontal state, the monochromatic light reference line emitter projects a reference rectangular frame with the frame size to the projection plane, the reference rectangular frame is also horizontal, and the camera shoots a red light reference line and a red light frame to realize position detection of the reference rectangular frame.

In addition, ray apparatus and camera setting are on the base, the base deviates from ray apparatus one side and sets up horizontal rotating shaft, horizontal rotating shaft's axial is parallel with the daylighting direction of camera, after the frame body size of reference rectangle frame is confirmed, when detecting monochromatic light reference line transmitter and being in the tilt state based on the gyroscope sensor, drive horizontal rotating shaft rotates in order to drive the base, adjustment monochromatic light reference line transmitter to level, ensure that ray apparatus and monochromatic light reference line transmitter light-emitting on the base are the level, wherein wide-screen projection system can dispose driving motor for horizontal rotating shaft. And after the monochromatic light reference line emitter is detected to be adjusted to be horizontal based on the gyroscope sensor, the monochromatic light reference line emitter is further controlled to project a reference rectangular frame with the size of the frame body to the projection surface.

Wherein, the calibration image can be including concatenation calibration image and focus calibration image, and concatenation calibration image is exclusively used in the contained angle and the two ray apparatus projection angle adjustment of two ray apparatus light-emitting direction, and focus calibration image is exclusively used in the adjustment of ray apparatus focus.

When the wide-screen projection system is powered on and started or reset, the optical machine driving chip can firstly control the light emitting directions of the two optical machines to be restored to the preset initial direction, the image processing chip then controls the two optical machines to respectively shoot the projection surfaces in the direction towards the camera, the spliced calibration image is projected, the color difference of the spliced calibration image relative to the two longitudinal boundaries is large (the Euclidean distance is larger than the preset difference value), for example, one spliced calibration image is red and the other spliced calibration image is blue, so that the boundary identification is favorably realized.

Step S40, if the initial position is not in the reference rectangular frame, obtaining the space coordinate of the first normal line passing through the position of the camera and being vertical to the plane where the optical machine is located, and controlling the monochromatic light reference line emitter to project the splicing boundary reference line to the projection plane by the space coordinate of the first normal line; adjusting the projection angle of the optical machine until the two spliced calibration images are spliced seamlessly at the reference line of the splicing boundary;

the camera dynamically collects splicing calibration images projected by the optical machine in real time, the image processing chip analyzes the positions of the dynamically collected splicing calibration images in real time, judges whether the initial positions of the two splicing calibration images are in a reference rectangular frame, if a virtual coordinate system is arranged on a projection plane, analyzes and obtains a first coordinate interval of the reference rectangular frame in the virtual coordinate system and a second coordinate interval of the two splicing calibration images in the virtual coordinate system, judges whether the second coordinate interval is included in the first coordinate interval, and if the second coordinate interval is included in the first coordinate interval, judges that the initial positions are in the reference rectangular frame; and if the second coordinate interval is not contained in the first coordinate interval, judging that the initial positions are not in the reference rectangular frame.

When it is determined that the initial positions are not in the reference rectangular frame, referring to fig. 6, it is shown that the splicing calibration images are relatively seriously deviated, a first normal passing through the position of the camera and perpendicular to the plane where the optical machines are located is determined, the first normal is a perpendicular line perpendicular to the camera, the spatial coordinate of the first normal is obtained, and then the spatial coordinate of the orthographic projection line (i.e. the splicing boundary reference line) of the first normal on the projection plane is obtained through analysis, so that the monochromatic light reference line emitter is controlled to project the splicing boundary reference line to the projection plane by the spatial coordinate of the first normal, and the relative longitudinal boundaries of the two splicing calibration images are required to be overlapped at the splicing boundary reference line finally, so that the projection angles of the two optical machines are continuously adjusted by taking the spatial coordinate as a target.

Step S50, performing trapezoid correction on the optical machine a with a smaller projected frame to obtain a smaller trapezoid corrected image, taking a longitudinal boundary of the smaller trapezoid corrected image close to the other optical machine B side as a symmetry axis, obtaining a symmetric mapping region of the smaller trapezoid corrected image mapped by the symmetry axis, performing trapezoid correction on the larger frame projected by the optical machine B according to a rectangular vertex coordinate of the symmetric mapping region, to obtain another trapezoid corrected image with the same size as the smaller trapezoid corrected image, and seamlessly splicing the two trapezoid corrected images to control the two optical machines to gradually project all image frames of the image to be displayed to the projection plane.

After the seamless splicing and overlapping of the splicing calibration images projected by the two optical machines relative to the longitudinal boundary is determined, the optical machine driving chip can control the two optical machines to output at least one frame of picture frame of the image to be displayed to the projection surface, and trapezoidal correction is respectively carried out on the two optical machines. Optionally, before the optical machine performs trapezoidal correction, the image processing chip performs trapezoidal correction on the optical machine a with a smaller projected picture frame to obtain a smaller trapezoidal correction image, a longitudinal boundary of the smaller trapezoidal correction image close to the other optical machine side is taken as a symmetry axis, a symmetric mapping region of the smaller trapezoidal correction image mapped by the symmetry axis is obtained, and according to a rectangular vertex coordinate of the symmetric mapping region, the larger picture frame projected by the optical machine B is subjected to trapezoidal correction to obtain another trapezoidal correction image with the same size as the smaller trapezoidal correction image. The image to be displayed is formal content projected by a wide-screen projection system required by a user, such as PPT, a movie, a television program and the like required by the user.

In this embodiment, the wide-screen projection is implemented by setting two photomasks, when a first distance from a photomask to a projection surface is detected, a second distance from another photomask to the projection surface is equal to a third distance from a camera to the projection surface, and the shooting direction of the camera is perpendicular to the projection surface, determining the frame body size of a reference rectangular frame with the adapted red light attribute according to the third distance, controlling a monochromatic light reference line emitter to project the reference rectangular frame with the frame body size to the projection surface when the monochromatic light reference line emitter is horizontal, and then projecting a spliced calibration image to the projection surface by the two photomasks, wherein when the initial positions of the two spliced calibration images are not in the reference rectangular frame, the deviation existing in the projection positions of the photomasks is large, the difficulty in identifying the relative positions of the two spliced calibration images is large, the calculation amount is large, and at this time, controlling the monochromatic light reference line emitter to project a spliced boundary reference line (the forward projection of a first normal) to the projection surface, because the light inlet and outlet directions of the camera and the monochromatic light reference line emitter are vertical to the projection plane, the splicing boundary reference line is the final position of seamless splicing of two splicing calibration images, the projection angle of the optical machines is adjusted according to the position relation between the two splicing calibration images and the splicing boundary reference line until the two splicing calibration images are seamlessly spliced at the splicing boundary reference line, finally the two optical machines are subjected to trapezoidal correction, and the two optical machines are controlled to project images to be displayed to the projection plane, so that the two optical machines jointly output projection pictures output by a single optical machine in a conventional scheme, the widths of the projection pictures respectively output by the two optical machines are shortened, even if the projection pictures with the shortened single width are reduced through trapezoidal correction under the condition that the optical machines are in side projection, or in wide-screen display, in order to keep the equal ratio of the high ratio of the width to be reduced, the two reduction processes are influenced by the common equal ratio of the projection pictures of the two optical machines, therefore, the amplitude of the actual projection picture for reducing in equal proportion can be greatly reduced, the problems that the upper and lower black edges of the projection are large and the projection area of the actual display image is small are solved, and the overall effect of the effective projection picture of the wide-screen projection system is improved.

Optionally, the step of adjusting the projection angle of the optical engine in step S40 until the two stitched calibration images are seamlessly stitched at the stitched boundary reference line includes:

step S41, adjusting the projection angles of the two optical machines by the preset initial steering, and respectively detecting the boundary distances between the two longitudinal boundaries of the two spliced calibration images and the spliced boundary reference line in real time;

after determining that the initial positions of the two spliced calibration images are not in the reference rectangular frame, the projection angles of the two optical machines are greatly deviated, the projection angles of the optical machines are adjusted by presetting initial steering, and the presetting initial steering can be set randomly, for example, the presetting initial steering is that one optical machine rotates clockwise and one optical machine rotates anticlockwise. In the rotation process of the optical machine, images are collected based on the camera, and the boundary distances between the longitudinal boundaries of the two splicing calibration images and the splicing boundary reference line are respectively detected in real time, for example, the longitudinal boundary of the splicing calibration image projected by the optical machine a and the splicing boundary reference line are a first boundary distance, and the splicing calibration image projected by the optical machine B and the splicing boundary reference line are a second boundary distance.

Step S42, reversing the preset initial steering of the first optical machine with the gradually increasing boundary distance, and adjusting the projection angle of the first optical machine by reversing the steering until the longitudinal boundary of the splicing calibration image of the first optical machine is seamlessly spliced with the reference line of the splicing boundary;

and step S43, keeping the preset initial steering of the second optical machine with the gradually increased boundary distance, and adjusting the projection angle of the second optical machine until the longitudinal boundary of the splicing calibration image of the second optical machine is seamlessly spliced with the reference line of the splicing boundary.

In the process of detecting the boundary distance, the corresponding optical machine with the increased boundary distance is used as a first optical machine, and the corresponding optical machine with the decreased boundary distance is used as a second optical machine. The increase of the boundary distance indicates that the splicing calibration image projected by the first optical machine is continuously far away from the splicing boundary reference line, the preset initial turning error (such as clockwise) of the first optical machine is required to be reversed, the projection angle of the first optical machine is adjusted by the reversed turning (such as anticlockwise) until the boundary distance of the first optical machine is 0, the longitudinal boundary of the splicing calibration image of the first optical machine is seamlessly spliced with the splicing boundary reference line, and the rotation of the first optical machine is stopped at this moment.

Similarly, the reduction of the boundary distance indicates that the splicing calibration image projected by the second optical machine is continuously close to the splicing boundary reference line, the preset initial turning of the second optical machine is correct (such as clockwise), the preset initial turning of the second optical machine is kept at the moment, the projection angle of the second optical machine is adjusted by the preset initial turning (such as anticlockwise) until the boundary distance of the second optical machine is 0, the longitudinal boundary of the splicing calibration image of the second optical machine is seamlessly spliced with the splicing boundary reference line, and the rotation of the second optical machine is stopped at the moment.

In the embodiment, the preset initial steering is not limited, the two optical machines directly adjust the projection angles of the two optical machines in the preset initial steering, if the boundary distance is increased, the preset initial steering of the corresponding optical machines is reversed, if the boundary distance is decreased, the preset initial steering of the corresponding optical machines is maintained, the two optical machines independently detect the boundary distance and independently adjust the projection angles, the longitudinal boundaries of the spliced calibration images of the two optical machines and the spliced boundary reference line perform independent seamless splicing detection, and the two optical machines independently perform steering stopping control during seamless splicing, so that the two spliced calibration images and the spliced boundary reference line at a constant position perform position comparison, two spliced calibration images with dynamically changed calculated positions are avoided, the boundary distance of the single optical machine is calculated, the single optical machine projection angle is adjusted and steered, the single optical machine is controlled to stop rotating, and the efficiency and the accuracy of the adjustment of the optical machine projection angles are improved, and further improve image mosaic efficiency.

Further, in another embodiment of the projection method based on a monochromatic light reference line emitter according to the present application, after the step of detecting whether the initial positions of the two stitched calibration images are both within the reference rectangular frame in step S30, the method further includes:

step A1, if the initial positions are all in the reference rectangular frame, detecting whether the two spliced calibration images have an overlapping area; if the overlapped area exists, the included angle of the light outgoing directions of the two optical machines is increased; if no overlapping area exists, the included angle of the light emitting directions of the two optical machines is reduced;

when the initial positions of the two spliced calibration images are detected to be in the reference rectangular frame, the projection angle deviation of the two optical machines is small, the projection angle adjustment of the splicing calibration can be directly carried out based on the position relation of the two spliced calibration images, and the seamless splicing of the two spliced calibration images can be completed more quickly.

The camera dynamically collects splicing calibration images projected by the optical machine in real time, the image processing chip carries out boundary identification and distance analysis on the splicing calibration images which are dynamically collected in real time, two opposite longitudinal boundaries of the two splicing calibration images can be identified firstly, the longitudinal direction is the longitudinal direction in the figure 3, then the distance between the two longitudinal boundaries is analyzed and estimated, wherein the distance between the two longitudinal boundaries is larger than 0, and the backgrounds of the two splicing calibration images are not overlapped, so that the two splicing calibration images do not have an overlapping area; the distance between the two longitudinal boundaries is less than 0 and the backgrounds of the two stitched calibration images coincide, indicating that there is an overlapping region between the two stitched calibration images. One point of a longitudinal edge of a projection plane can be used as a zero point of a transverse coordinate axis, the distance between two longitudinal boundaries is equal to the difference between the abscissas of the two longitudinal boundaries on the transverse coordinate axis, specifically, the difference is equal to the difference between the abscissa of the longitudinal boundary far away from the zero point (hereinafter referred to as far coordinate) and the abscissa of the longitudinal boundary near to the spliced calibration image (hereinafter referred to as near coordinate), wherein the distance is a negative value, which indicates that the far coordinate is closer to the zero point of the transverse coordinate axis relative to the near coordinate, and then the existence of an overlapping region in the two spliced calibration images is judged.

The method for analyzing the spliced calibration images comprises the steps of carrying out analysis on the spliced calibration images in a mode that the distance between two longitudinal boundaries in the previous section is equal to the difference value of the abscissa of the two longitudinal boundaries and the abscissa of the transverse coordinate axis, judging whether the two spliced calibration images have an overlapping area conveniently, judging that the position relation is intersected when the two spliced calibration images have the overlapping area, and judging that the position relation is separated when the two spliced calibration images do not have the overlapping area.

Step A2, in the process of adjusting the included angle, judging whether two longitudinal boundaries of the spliced calibration image are overlapped or not based on an image edge recognition algorithm; and if the two longitudinal boundaries are overlapped, judging that the two spliced calibration images are spliced seamlessly, and stopping the rotation of the two optical machines.

The position relation of the two spliced calibration images generally comprises intersection and separation, the position relation is associated with the two optical machines, the projection angles of the two optical machines are adjusted according to the position relation, and the position relation of the two spliced calibration images is synchronously detected until the two spliced calibration images are overlapped relative to the two longitudinal boundaries.

Generally speaking, two stitching calibration images are mostly in a separated state, even if the two stitching calibration images are in an intersecting state, the intersecting state of the two stitching calibration images can be quickly judged through image analysis, generally, the colors of the two stitching calibration images are different, for example, one red color is different from the other blue color, when a fourth color except for red, blue and projection plane colors (such as white) is detected, the two stitching calibration images are judged to be in the intersecting state, an included angle of light emitting directions of the two optical machines is increased, projection angles of the two optical machines are adjusted until the fourth color is eliminated, two longitudinal boundaries are overlapped, and the two stitching calibration images are seamlessly stitched.

Therefore, when the two spliced calibration images are in a phase separation state, the larger the distance between the two spliced calibration images and two longitudinal boundaries is, the larger the included angle formed by the light emitting directions of the two optical machines is, the included angle needs to be reduced, and then when the judgment position relation is the phase separation, the included angle formed by the light emitting directions of the two optical machines is reduced, so that the projection angle of at least one optical machine is adjusted, wherein the distance is positively correlated with the adjustment speed of the projection angle of the optical machines, namely, when the distance is larger, the included angle formed by the light emitting directions of the two optical machines is larger, and the projection angle of the optical machines is adjusted at a larger rotation speed. In the process of continuously adjusting the projection angle of the optical machine, based on an edge recognition algorithm, the processor continuously detects the distance between the two splicing calibration images and the two longitudinal boundaries based on the camera, when the distance is 0, the two splicing calibration images are overlapped with the two longitudinal boundaries, and after the adjustment of the projection angle of the optical machine is finished, the two optical machines are stopped rotating. The edge recognition algorithm is used for recognizing pixel point sets with rapidly changed brightness, gray scale and/or color difference (the variable quantity of adjacent pixel points is larger than a preset change threshold value) in the image, the continuous distribution areas of the pixel point sets are longitudinal boundaries, further, under the condition that the projection angle deviation of the two optical machines is small, the image recognition difficulty and the calculated quantity of the camera are small, the splicing process is rapidly and accurately completed based on the relative positions of the two spliced calibration images, the spliced boundary reference line does not need to be projected again, and the splicing calibration process of the optical machines is adjusted according to the situation.

Further, in another embodiment of the projection method based on the monochromatic light reference line emitter, after the step of comparing the first distance and the second distance in step S10, the method further includes:

step C, if the first distance and the second distance are not equal, the connecting line is not parallel to the projection plane, the projection plane is judged to be inclined, and a user is guided to carry out position adjustment on the projection plane or carry out position adjustment on the projector through an interface;

When first distance and second distance are not equal, when being promptly the line and the plane of projection nonparallel, can presume earlier that do not adjust the ray apparatus and put the position, then judge that the plane of projection takes place the slope, wide-screen projection system guides the user through pronunciation or projection interface and carries out the adjustment of plane of projection, after the user adjusts the plane of projection, instructs this wide-screen projection system again to carry out parallel detection once more. If the projection surface is a curtain, the user only needs to adjust the projection in the horizontal direction back and forth. If the projection surface is not adjusted, the wide-screen projection system controls the horizontal rotating shaft under the two optical machine bases to carry out left-right direction rotation adjustment of the shooting direction of the camera, when the distance between the wide-screen projection system and one side of the projection surface is larger based on the existing distance sensor of the camera head, the bases are controlled to rotate towards the other side direction until the distance difference between the distance sensor and the two sides of the projection surface is within a threshold value, and then the two optical machines are judged to be parallel to the projection surface.

When the rotating base is judged to be incapable of adjusting the connection line of the two optical machines and the projection plane in parallel, the wide-screen projection system reminds that the automatic adjustment cannot be carried out through voice or a projection interface, the adjustment is carried out after the projector needs to be aligned again, and the horizontal rotating shaft under the two optical machine bases is controlled to carry out left-right direction rotation adjustment until the connection line of the two optical machines and the projection plane are parallel.

In this embodiment, when detecting two ray apparatus lines and plane of projection nonparallel, adjust the great plane of projection of the probability of taking place slope earlier to smooth just, if line and plane of projection still are nonparallel this moment, the horizontal rotating shaft carries out left right direction rotation under the adjustment setting ray apparatus base again, until the line and the plane of projection of ray apparatus and camera are parallel, thereby avoid before not adjusting the plane of projection, carry out unnecessary adjustment to the base repeatedly, realize the line of ray apparatus and camera and the parallel adjustment scheme of plane of projection with a high efficiency, accurately mode.

Optionally, the wide-screen projection system further includes a focus motor disposed at a lens of the optical machines, and before the step of controlling the two optical machines to respectively project the stitched calibration image onto the projection surface in step S30, the method further includes:

step D, controlling the two optical machines to project focal length calibration images to the projection surface; based on the definition of the focus calibration image dynamically acquired by the camera, the focus motor is controlled to adjust the focus of the two optical machines until the definition reaches a preset definition threshold value.

Before the ray apparatus carries out the concatenation calibration, set up ray apparatus focus calibration flow, two ray apparatus of image processing chip control this moment are to projection plane projection focus calibration image, and the focus of two ray apparatus of control focusing motor adjustment, and carry out the comparison to the definition and the budget definition threshold of the focus calibration image of gathering in real time through the camera, the definition when focus calibration image reaches preset definition threshold, show that the focus adjustment of two ray apparatus finishes, the ray apparatus can project clear projection picture this moment, guarantee the definition of the concatenation calibration image of the follow-up projection of ray apparatus, be favorable to the camera to gather the calibration image of high definition, be favorable to the accurate analysis of concatenation calibration image, the accuracy and the efficiency of image calibration have been improved.

Preferably, after the step of acquiring a first distance from one optical engine to the projection surface, a second distance from another optical engine to the projection surface, and a third distance from the camera to the projection surface based on the distance sensor in step S10, the method further includes:

step E1, if detecting that the wide screen projection is cancelled, detecting the current projection brightness requirement of the wide screen projection system;

when a wide-screen projection canceling instruction input by a user is detected, which indicates that the user does not need wide-screen projection currently, the current projection brightness requirement of the wide-screen projection system is further detected.

Step E2, if the current projection brightness requirement is greater than or equal to the preset brightness threshold, controlling the two optical machines to project the spliced calibration images to the area perpendicular to the projection plane in the shooting direction of the camera until the two spliced calibration images are completely overlapped;

if the current projection brightness requirement is larger than or equal to the preset brightness threshold value, it is indicated that the current ambient light of the user is bright, and brightness display needs to be enhanced, the two optical machines are controlled to project the spliced calibration images to the area where the shooting direction of the camera is perpendicular to the projection surface until the two spliced calibration images are completely overlapped, and the brightness of the projection images of the two optical machines is mutually enhanced to highlight the image to be displayed.

In addition, if the current projection brightness requirement is smaller than the preset brightness threshold, one optical machine is closed, and only one optical machine is used for projection, so that the brightness requirement of a user for projecting an image to be displayed is met, and the electric energy consumed by one optical machine is saved.

And E3, performing trapezoidal correction on the two optical machines, and controlling the two optical machines to project the same image to be displayed to the projection surface.

In the case that the two ray machine projection pictures are overlapped and the same, the process of the keystone correction is the same as the keystone correction in S50.

In addition, the projection method based on the monochromatic light reference line emitter further comprises the following steps: after detecting that the optical machine projects the images to be displayed on the projection surface, detecting the similarity between the images to be displayed projected by the optical machine, and counting the duration of the similarity which is greater than or equal to a preset similarity threshold; if the duration is longer than the preset unit duration, outputting a prompt of whether to shut down by the wide-screen projection system, and if the preset waiting duration after outputting the prompt of whether to shut down is not responded by the user, automatically shutting down the optical machine; if a shutdown instruction determined by a user or a shutdown instruction determined not to be performed is received, executing according to the user instruction; and if the similarity is smaller than the preset similarity threshold, clearing the duration of which the current statistical similarity is greater than or equal to the preset similarity threshold so as to carry out statistics again. Therefore, when the optical machine projects the images which are basically the same for a long time, the duration of projecting the images which are basically the same starts to be counted, when the duration is longer than the duration of the preset unit, the fact that the user possibly sleeps in the projection process of the optical machine or the user is busy in other affairs indicates that the user possibly watches the optical machine, at the moment, in order to save electric energy and prolong the service life of the optical machine, at the moment, the wide-screen projection system outputs a prompt of whether to shut down, and a shutdown instruction or automatic shutdown can be further executed.

Moreover, in order to further rapidly detect whether the projection position of the stitched calibration image is just projected to the middle of the projection plane after the two stitched calibration images are seamlessly stitched, the projection method based on the monochromatic light reference line emitter further comprises the following steps:

calculating and acquiring the approximate resolution of the overall image relative to the actual resolution according to the number of the transverse pixels and the number of the longitudinal pixels; comparing the approximate resolution with a preset resolution of the two optical machine projection images;

if the difference between the approximate resolution and the preset resolution is within a threshold value, outputting a complete prompt of the wide-screen projection; if the difference between the approximate resolution and the preset resolution exceeds a threshold value, prompting a user to adjust the position of the projector or the position of the projection surface through a voice or projection interface, and then performing splicing calibration again until the difference between the approximate resolution and the preset resolution is within the threshold value.

When the difference between the approximate resolution and the budget resolution is within a threshold value, the splicing calibration image of the wide-screen projection is complete, the seamlessly spliced splicing calibration image is located in the middle of the projection surface, and excessive deviation does not occur.

In order to achieve the above object, the present application further provides a wide-screen projection system, which includes two photomasks disposed on the same plane, a camera, a red light emitter, a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the camera is located on a plane perpendicular to a connection line between the two photomasks and defined by a connection line center, a center of the monochromatic light reference line emitter is located on a vertical plane defined by a camera center and a midpoint between the two photomasks, the photomasks and the camera are respectively provided with a distance sensor, the center of the monochromatic light reference line emitter is located on a plane perpendicular to the camera center and the midpoint between the two photomasks, the camera, the gyro sensor and the monochromatic light reference line emitter are fixed on a base plane, and a projection plane is disposed in a shooting direction of the camera, the computer program realizes the steps of the above-mentioned projection method based on a monochromatic light reference line emitter when being executed by the processor.

To achieve the above object, the present application further provides a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements the steps of the above projection method based on the monochromatic light reference line emitter.

It should be noted that, in this document, 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, the statement that an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the processes, methods, articles, or apparatuses that comprise the element, and that elements, features, or elements having the same designation in different embodiments of the application may or may not have the same meaning as that of the other elements in the embodiment illustrated and/or described in further detail in connection with the context of that embodiment.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope herein. The word "if" as used herein may be interpreted as "at … …" or "when … …" or "in response to a determination", depending on the context. Also, as used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context indicates otherwise. It will be further understood that the terms "comprises," "comprising," "includes" and/or "including," when used in this specification, specify the presence of stated features, steps, operations, elements, components, items, species, and/or groups, but do not preclude the presence, or addition of one or more other features, steps, operations, elements, components, species, and/or groups thereof. The terms "or" and/or "as used herein are to be construed as inclusive or meaning any one or any combination. Thus, "A, B or C" or "A, B and/or C" means "any of the following: a; b; c; a and B; a and C; b and C; A. b and C ". An exception to this definition will occur only when a combination of elements, functions, steps or operations are inherently mutually exclusive in some way.

It should be understood that, although the steps in the flowcharts in the embodiments of the present application are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not performed in the exact order shown and may be performed in other orders unless explicitly stated herein. Moreover, at least some of the steps in the figures may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, in different orders, and may be performed alternately or at least partially with respect to other steps or sub-steps of other steps.

It should be noted that step numbers such as S10 and S20 are used herein for the purpose of more clearly and briefly describing the corresponding contents, and do not constitute a substantial limitation on the sequence, and those skilled in the art may perform S20 first and then perform S10 in the specific implementation, which should be within the scope of the present application.

The above-mentioned serial numbers of the embodiments of the present application are merely for description and do not represent the merits of the embodiments.

Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present application may be embodied in the form of a software product, which is stored in a storage medium (such as ROM/RAM, magnetic disk, optical disk) and includes instructions for enabling a terminal (such as a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present application.

While the present embodiments have been described with reference to the accompanying drawings, it is to be understood that the invention is not limited to the precise embodiments described above, which are meant to be illustrative and not restrictive, and that various changes may be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. A projection method based on a monochromatic light reference line emitter is characterized in that the projection method based on the monochromatic light reference line emitter is applied to a wide-screen projection system, the wide-screen projection system comprises two optical machines, a camera and the monochromatic light reference line emitter, distance sensors are respectively arranged on the optical machines and the camera, a gyroscope sensor is arranged on the monochromatic light reference line emitter, and a projection surface is arranged in the shooting direction of the camera;

when the ray machines are detected to be electrified, based on the distance sensor, a first distance from one ray machine to the projection surface, a second distance from the other ray machine to the projection surface and a third distance from the camera to the projection surface are obtained, and a first normal line passing through the position of the camera and perpendicular to a vertical plane of a connecting line of the two ray machines is determined;

comparing the first distance with the second distance to deduce and judge whether the projection plane is parallel to a vertical plane where the connecting lines of the two optical machines are located, and further judging whether the projection system is in a plane forward projection state; if the projection system is in a plane orthographic projection state, determining the frame body size of the reference rectangular frame to be projected by the monochromatic light reference line emitter according to the third distance;

when the gyroscope sensor detects that the monochromatic light reference line emitter is in a horizontal state, the monochromatic light reference line emitter is controlled to project a reference rectangular frame with the size of the frame body to the projection surface; controlling the two optical machines to respectively project spliced calibration images to a projection surface, and detecting whether the initial positions of the two spliced calibration images are both in the reference rectangular frame;

if the initial positions are not located in the reference rectangular frame, acquiring the space coordinate of the first normal line, and controlling the monochromatic light reference line emitter to project the splicing boundary reference line to the projection plane according to the space coordinate of the first normal line; adjusting the projection angle of the optical machine until the two spliced calibration images are spliced seamlessly at the spliced boundary reference line;

firstly, trapezoidal correction is carried out on the optical machine A with a smaller projected picture frame to obtain a smaller trapezoidal correction image, the longitudinal boundary of the smaller trapezoidal correction image close to the other optical machine B side is taken as a symmetry axis, a symmetric mapping area of the smaller trapezoidal correction image mapped by the symmetry axis is obtained, trapezoidal correction is carried out on the larger picture frame projected by the optical machine B according to the rectangular vertex coordinates of the symmetric mapping area, so that the other trapezoidal correction image with the same size as the smaller trapezoidal correction image is obtained, the two trapezoidal correction images are seamlessly spliced, and then the two optical machines are controlled to gradually project all image frames of an image to be displayed to the projection surface.

2. The monochromatic light reference line emitter-based projection method as claimed in claim 1, wherein the step of adjusting the projection angle of the optical engine until two stitching calibration images are seamlessly stitched at the stitching boundary reference line comprises:

reversing the preset initial steering of the first optical machine with the boundary distance gradually increasing, and adjusting the projection angle of the first optical machine by the reversed steering until the longitudinal boundary of the splicing calibration image of the first optical machine in the two opposite longitudinal boundaries is seamlessly spliced with the reference line of the splicing boundary;

and keeping the preset initial steering of the second optical machine with the gradually reduced boundary distance, and adjusting the projection angle of the second optical machine until the longitudinal boundary of the splicing calibration image of the second optical machine in the two opposite longitudinal boundaries is seamlessly spliced with the reference line of the splicing boundary.

3. The monochromatic light reference line emitter-based projection method according to claim 2, wherein after the step of detecting whether the initial positions of the two stitched calibration images are both within the reference rectangular frame, the method further comprises:

4. The monochromatic light reference line emitter-based projection method as claimed in claim 3, wherein the monochromatic light reference line emitter-based projection method further comprises:

after the splicing calibration images are detected to be overlapped relative to the two longitudinal boundaries, the camera acquires the two splicing calibration images after the boundaries are overlapped again, and then the number of transverse pixels and the number of longitudinal pixels of the overall image after the two splicing calibration images acquired by the camera are seamlessly spliced are detected;

comparing the approximate resolution with a preset resolution of the splicing calibration image;

if the difference between the approximate resolution and the preset resolution exceeds a threshold value, prompting a user to adjust the position of the projector or the position of the projection surface through a voice or projection interface, and then performing splicing calibration again until the difference between the approximate resolution and the preset resolution is within the threshold value.

5. The method as claimed in claim 4, wherein the optical engine and the camera are disposed on a base, a horizontal rotating shaft is disposed on a side of the base opposite to the optical engine, an axial direction of the horizontal rotating shaft is parallel to a lighting direction of the camera,

6. The monochromatic light reference line emitter-based projection method of claim 5, wherein the step of comparing the first distance and the second distance is followed by further comprising:

if the first distance is not equal to the second distance, the projection plane is not parallel to the vertical plane where the connecting lines of the two optical machines are located,

guiding a user to adjust the position of the projection surface or adjust the position of the projector through the projection surface;

if the user selects to adjust the position of the projection plane, the step of judging whether the projection plane is parallel to the vertical plane where the two optical-mechanical connecting lines are located is executed again after the user finishes the adjustment until the projection plane is parallel to the vertical plane where the two optical-mechanical connecting lines are located;

if the user selects the automatic adjustment of the projector, controlling a horizontal rotating shaft under a base bearing the two optical machines to carry out left-right direction rotation adjustment until the projection plane is parallel to a vertical plane where the connecting line of the two optical machines is located;

7. The monochromatic light reference line emitter-based projection method of claim 6, wherein the wide-screen projection system further comprises a focusing motor, the focusing motor is arranged at the lens of the optical machine,

8. The method as claimed in claim 7, further comprising, after the steps of obtaining a first distance from one carriage to the projection surface, a second distance from another carriage to the projection surface, and a third distance from the camera to the projection surface based on the distance sensor:

if the command of canceling the wide-screen projection is detected, detecting the current projection brightness requirement of the wide-screen projection system;

and performing trapezoidal correction on the images projected by the two optical machines, and controlling the two optical machines to project the same image to be displayed to the projection surface after the trapezoidal correction is completed.

9. A wide screen projection system, characterized in that, the wide screen projection system includes two ray apparatus, camera, monochromatic light reference line emitter, memory and processor, the memory storage can be in the computer program of operation on the processor, the camera is located perpendicular to the perpendicular plane that the line place between two ray apparatus and including the plane of the center of this line, monochromatic light reference line emitter center is located the camera center and the perpendicular plane that two ray apparatus line midpoint confirm, set up distance sensor respectively at ray apparatus and camera, set up gyroscope sensor on the monochromatic light reference line emitter, camera and monochromatic light reference line emitter are fixed in on a base plane, set up the plane of projection in camera shooting direction, the computer program by when the processor carries out to realize above-mentioned claim 1-8 any one the projection direction based on monochromatic light reference line emitter The steps of the method.

10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the method for monochromatic light reference line emitter based projection as claimed in any one of the claims 1 to 8.