CN106101676B - A kind of determination method and system of short focus projector installation site - Google Patents
A kind of determination method and system of short focus projector installation site Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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Abstract
The invention discloses the determination methods and system of a kind of short focus projector installation site, and the method includes obtaining the projection image on projection surface by camera when original image is projeced into projection surface by short focus projector；The straight incline rate of straight line corresponding with original image horizontal linear in the projection image is obtained, and the straight incline rate is compared with default straight incline rate a reference value；When straight incline rate and default straight incline rate a reference value are inconsistent, there are deviations for the installation site of prompt user's short focus projector.In the present invention according in projected image straight incline rate and default straight line tangent line rate a reference value be compared and judge the installation site of short focus projector with the presence or absence of deviation, solves the problem of existing short focus projector of the prior art can not judge itself installation site, make troubles to the use of user.
Description
Technical Field
The invention relates to the technical field of short-focus projectors, in particular to a method and a system for judging the installation position of a short-focus projector.
Background
In recent years, short-focus projectors gradually become hot spots, and are rapidly favored by a large number of users in development. Short focus projectors have a very short transmittance, i.e., the ratio of the distance between the projector and the screen to the screen size. One advance in the field of projection is that projectors can project pictures onto large screens (70 inches or more) from a few inches away from the screen surface. The situation that the picture on the screen is blocked by walking in front of the projector does not exist any more. By means of the ultra-short focus projector, bright and colorful large-screen images can be watched in any room, classroom and conference room.
When the projector product is used, the situation that the projected image is deformed due to the fact that the placing angle cannot reach the ideal condition generally exists. In the conventional projector market, there are already a number of brands and models of products with manual/automatic keystone correction/geometry correction capabilities. However, the short-focus projector is greatly different from the traditional projector in the use mode and the projection principle, the difficulty of realizing the self posture estimation function is high, the practicability is relatively high, and no short-focus projector product for realizing the function is available on the market.
Accordingly, the prior art is yet to be improved and developed.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method and a system for judging the installation position of a short-focus projector, and aims to solve the problem that the existing short-focus projector in the prior art cannot judge the installation position of the projector and is inconvenient for a user to use.
The technical scheme of the invention is as follows:
a method for judging the installation position of a short-focus projector comprises the following steps:
when the short-focus projector projects an original image on a projection surface, acquiring a projected image on the projection surface through a camera;
acquiring a linear inclination rate of a straight line corresponding to a horizontal straight line of the original image in the projected image, and comparing the linear inclination rate with a preset linear inclination rate reference value;
and when the linear inclination rate is inconsistent with the preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation.
The method for judging the installation position of the short-focus projector, wherein when the linear inclination rate is inconsistent with a preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation specifically comprises:
when the linear inclination rate is inconsistent with a preset linear inclination rate reference value, calculating a deflection angle of the short-focus projector relative to the normal direction of the mounting surface according to the linear inclination rate;
and prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal direction of the installation surface.
The method for judging the installation position of the short-focus projector, wherein the prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal direction of the installation surface specifically comprises the following steps:
when the deflection angle of the short-focus projector relative to the normal direction of the installation surface is smaller than zero degree, prompting a user that the short-focus projector deflects rightwards;
and when the deflection angle of the short-focus projector relative to the normal direction of the installation surface is larger than zero degree, prompting a user that the short-focus projector deflects leftwards.
The method for judging the installation position of the short-focus projector is characterized in that the step of calculating the deflection angle of the short-focus projector relative to the normal direction of the installation surface according to the linear inclination rate specifically comprises the following steps:
calculating the deflection angle of the short-focus projector corresponding to the linear inclination rate relative to the normal direction of the installation surface according to the corresponding relation between the linear inclination rate and the deflection angle of the short-focus projector relative to the normal direction of the installation surface; the corresponding relation between the linear inclination rate and the deflection angle of the short-focus projector relative to the normal direction of the installation surface is as follows:
wherein,，andall coefficients are constant, K is the linear inclination rate, and α is the deflection angle of the short-focus projector relative to the normal direction of the installation surface.
The method for judging the installation position of the short-focus projector is characterized in that the optical axis of the camera and the optical axis of the lens of the short-focus projector are in the same plane.
The method for judging the installation position of the short-focus projector comprises the step of judging whether the installation position of the short-focus projector is correct or not, wherein the reference value of the linear inclination rate is the inclination rate of a straight line, corresponding to a horizontal straight line in an original image, in a projected image obtained by a camera when the short-focus projector is installed correctly.
A short focus projector mounting position determination system, comprising:
the acquisition module is used for acquiring a projection image on the projection surface through the camera when the short-focus projector makes the original image on the projection surface;
the image processing module is used for acquiring the linear inclination rate of a straight line corresponding to the horizontal straight line of the original image in the projection image and comparing the linear inclination rate with a preset linear inclination rate reference value;
and the prompting module is used for prompting a user that the installation position of the short-focus projector has deviation when the linear inclination rate is inconsistent with the preset linear inclination rate reference value.
The judging system of the installation position of the short-focus projector comprises a prompting module and a judging module, wherein the prompting module specifically comprises:
the calculation unit is used for calculating the deflection angle of the short-focus projector relative to the normal direction of the installation surface according to the linear inclination rate when the linear inclination rate is inconsistent with a preset linear inclination rate reference value;
and the prompting unit is used for prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal direction of the installation surface.
And the judging system of the installation position of the short-focus projector is characterized in that the optical axis of the camera and the optical axis of the lens of the short-focus projector are in the same plane.
And the judging system of the installation position of the short-focus projector is characterized in that the reference value of the linear inclination rate is the inclination rate of a straight line which is obtained by a camera and corresponds to a horizontal straight line in the original image when the short-focus projector is installed correctly.
The invention provides a method and a system for judging the installation position of a short-focus projector, wherein the method comprises the steps of acquiring a projection image on a projection surface through a camera when the short-focus projector projects an original image on the projection surface; acquiring a linear inclination rate of a straight line corresponding to a horizontal straight line of the original image in the projected image, and comparing the linear inclination rate with a preset linear inclination rate reference value; and when the linear inclination rate is inconsistent with the preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation. According to the invention, whether the installation position of the short-focus projector has deviation or not is judged according to the comparison between the linear inclination rate in the projected image and the preset linear tangent rate reference value, and the problem that the existing short-focus projector in the prior art cannot judge the installation position of the short-focus projector and is inconvenient for a user to use is solved.
Drawings
Fig. 1 is a flowchart of a method for determining an installation position of a short-focus projector according to a preferred embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a short-focus projector installation position determination system according to the present invention.
Detailed Description
The invention provides a method and a system for judging the installation position of a short-focus projector, and the invention is further described in detail below in order to make the purpose, the technical scheme and the effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
The short-focus projector comprises a luminous source and a chip, wherein the luminous source is used for providing a physical source during projection work, and the luminous source is reflected to a screen through the chip to directly form an image. And short focus projectors have a very short transmittance, i.e. the ratio of the distance between the projector and the screen to the screen size. Which projects the picture onto a large screen from a few inches from the screen surface.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method for determining an installation position of a short-focus projector according to a preferred embodiment of the present invention. The method is applied to a short-focus projector provided with a camera, and comprises the following steps:
and S100, when the short-focus projector projects the original image on the projection surface, acquiring a projection image on the projection surface through the camera.
Specifically, the short-focus projector projecting the original image onto the projection surface means that a user presets and installs the short-focus projector, and projects the image to be projected onto the projection surface through the short-focus projector. In practical applications, the short-focus projector may be placed on a table, a floor, or other position to project an image onto a plane perpendicular to the plane on which the short-focus projector is placed, which is referred to herein as a projection plane. In this embodiment, the short-focus projector is installed on the ground to project an image on a wall surface. That is, the projection of the original image on the projection surface by the short-focus projector means that the short-focus projector is attached to the ground and the projector projects the original image on the wall surface. It should be noted that the floor and the wall are perpendicular to each other, and the wall and the floor are both flat.
In this embodiment, in order to enable the short-focus projector to project the original image on the projection surface, the application of the short-focus projector before projecting the image on the projection surface includes a pre-installation process, which specifically includes:
the user installs the short-focus projector on the ground in advance, and adjusts the inclination angle of the camera relative to the ground normal direction, so that the camera can acquire the projection image of the short-focus projector projected on the projection surface. The degree of the inclination angle of the camera relative to the ground normal direction can be 10-20 degrees. Meanwhile, the optical axis of the camera and the optical axis of the short-focus projector lens are on the same plane.
Further, after the short-focus projector projects the original image on the projection surface, a camera provided on the short-focus projector acquires the projection image on the projection surface, and performs distortion correction on the acquired projection image. The aberration correction may employ the following procedure: firstly, calibrating an image by adopting a camera calibration process, then acquiring internal parameters of the calibrated camera, and finally carrying out distortion correction on the image acquired by the camera according to the internal parameters of the camera. Here, since the camera calibration process is the prior art in computer vision, e.g., the zhangying calibration method; so that the camera calibration process is not set forth in detail here.
S200, obtaining a straight line inclination rate of a straight line corresponding to the horizontal straight line of the original image in the projection image, and comparing the straight line inclination rate with a preset straight line inclination rate reference value.
Specifically, the acquiring of the linear inclination rate of the straight line corresponding to the original image horizontal line in the projection image means acquiring the linear inclination rate of the straight line corresponding to the original image horizontal line in the projection image after the abnormality correction. In this embodiment, the straight line refers to a straight line in the original image projected on the projection surface by the short-focus projector. The linear inclination rate is a straight line obtained by correcting a straight line corresponding to a horizontal straight line in the original image in the projection image acquired by the camera, and the slope of the straight line in a rectangular coordinate system of the projection surface.
Further, the horizontal straight line pattern in the image projected on the projection surface by the projector is also a straight line after being acquired and corrected by the camera, and only the slope changes (with respect to the same rectangular coordinate system). Moreover, when the plane formed by the optical axis of the lens of the projector and the optical axis of the camera is perpendicular to both the wall surface and the ground, the geometric relationship shows that the horizontal straight line of the pre-projected content in the projector is also a horizontal straight line when the horizontal straight line is imaged on the wall surface (projection surface), and the straight line in the image acquired by the camera is also horizontal, wherein the X axes of the direct coordinate system to which the projected content, the projection surface and the image acquired by the camera belong are parallel to each other, and the Y axes are also parallel to each other.
However, in actual use, the short-focus projector itself has some factors, such as a position error between a plane formed by the lens optical axis of the projector and the camera optical axis and a wall surface and a ground surface. When the projector is facing the wall (the installation position is accurate), the straight line in the image acquired by the camera may not be horizontal, so that the straight line slope reference value K0 is stored in the short-focus projector in advance.
Further, when the linear inclination rate of the projected image is acquired, the linear inclination rate is compared with a preset linear inclination rate reference value.
And S300, when the linear inclination rate is inconsistent with the preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation.
Specifically, the preset linear inclination rate reference value is a judgment standard for judging the installation correctness of the short-focus projector, so that when the obtained linear inclination rate is compared with the preset linear inclination rate reference value, if the obtained linear inclination rate is inconsistent with the preset linear inclination rate reference value, the installation error of the short-focus projector is indicated, and meanwhile, a user is reminded of the storage deviation of the installation position of the short-focus projector. In practical applications, the short-focus projector may display the prompt on the projection surface. It may project the reminder information above, below, or otherwise on the projected image. It is possible to close the projection image and project only the indication of the mounting position storage deviation on the projection surface. Furthermore, the user can be prompted by means of prompting sound and the like while the projection installation on the projection surface has deviation.
In the present embodiment, if the linear inclination rate coincides with the preset linear inclination rate reference value, it indicates that the short-focus projector is correctly installed. It can prompt the user that the installation location is correct and the short focus projector can be used. The manner in which the prompt is used to indicate that the installation is correct may be the same as the manner in which the installation is prompted to be offset, or it may be different from the manner in which the installation is prompted to be offset, and is not set forth herein.
In an embodiment of the present invention, in a case where the linear inclination rate K does not coincide with the preset linear inclination rate reference value K0, a comparison process may be further included, in particular, a comparison between the linear inclination rate and the preset linear inclination rate reference value is performed, and a deflection direction of the short-focus projector position with respect to the normal direction of the installation surface (ground) is determined according to a magnitude relationship between the linear inclination rate and the preset linear inclination rate reference value. When the linear inclination rate K is larger than a preset linear inclination rate reference value K0, the short-focus projector deflects leftwards relative to the normal direction of the installation surface (ground); when the linear inclination rate K is smaller than a preset linear inclination rate reference value K0, the short-focus projector deflects rightward with respect to the normal direction of the installation surface (ground). Therefore, the deflection direction of the installation position of the short-focus projector can be conveniently determined by a user, and the projector can be adjusted through the deflection direction.
In another embodiment of the invention, in order to facilitate the use of the user and bring better user experience to the user, the deflection angle of the short-focus projector can be determined according to the linear inclination rate. The deflection angle is a deflection angle of the short-focus projector relative to the normal direction of the ground, that is, an included angle between the optical axis of the lens of the short-focus projector and the normal direction of the projection surface (wall surface). In this embodiment, a plane formed by the optical axis of the camera and the optical axis of the short-focus projector lens, a wall surface and a ground surface are perpendicular to each other two by two, and a rectangular coordinate system is established by taking the normal direction of the three planes as X, Y and the Z axis, wherein the normal direction of the plane formed by the optical axis of the camera and the optical axis of the short-focus projector lens is the X axis direction, the normal direction of the wall surface is the Y axis direction, and the normal direction of the ground surface is the Z axis direction. Then, the deflection angle a refers to the deflection angle a of the short-focus projector in the Z-axis direction. If the mounting position of the projector is correct, a =0, a <0 when the mounting position of the projector is deflected to the left, and a >0 when the mounting position of the projector is deflected to the right.
In this embodiment, when the linear inclination rate of the projection image is obtained, comparing the linear inclination rate with a preset linear inclination rate reference value specifically includes:
s301, when the linear inclination rate is inconsistent with a preset linear inclination rate reference value, calculating the deflection angle of the short-focus projector relative to the normal of the installation surface according to the linear inclination rate.
Specifically, the calculation of the deflection angle of the short-focus projector with respect to the normal of the installation surface based on the linear inclination ratio is specifically a calculation of the deflection angle of the short-focus projector with respect to the normal of the installation surface based on the correspondence between the linear inclination ratio and the deflection angle of the short-focus projector with respect to the normal of the installation surface.
When the short-focus projector is correctly installed, the plane formed by the optical axis of the projection lens and the optical axis of the camera is perpendicular to the wall surface and the ground, so the deflection angle a =0, and the slope of the straight line is 0 no matter how far the projector is from the projection wall surface. When the deflection angle a is not 0, the slope of the straight line changes with the change of the distance D from the projector to the wall, for example, when a is about-20 degrees, the slopes are 0.056, 0.086, 0.111 and 0.141 at different distances; therefore, the slope K is also a function of the distance D. Although the slope K and the distance D have a linear relation, the linear relation has small influence in the normal projection distance range of the short-focus projector, so that the linear relation is simplified into a constant coefficientAnd obtaining the corresponding relation between the linear inclination rate and the deflection angle of the short-focus projector relative to the normal of the installation surface as follows:
wherein,，andall are constant coefficients, K is the linear tilt rate, and α is the deflection angle of the short-focus projector relative to the normal of the mounting surface.
According to the formula, under the condition that whether the installation position of the short-focus projector is correct or not is unknown, the straight slope K is obtained from the image obtained by the camera (after distortion correction), and whether the installation position of the short-focus projector has deviation or not is judged. Specifically, when K > K0, the deflection angle a of the short-focus projector is less than 0, and the installation position of the short-focus projector deflects to the left; when K < K0, the short-focus projector deflection angle a is greater than 0, and the installation position of the short-focus projector deflects to the right; when K = K0, the stand-alone projector deflection angle a =0, and the installation position of the short focus projector is correct.
And S302, prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal line of the installation surface.
Specifically, when the deflection angle of the short-focus projector relative to the normal of the installation surface is smaller than zero degree, prompting a user that the short-focus projector deflects rightwards; and when the deflection angle of the short-focus projector relative to the normal of the installation surface is larger than zero degree, prompting a user that the short-focus projector deflects leftwards.
The invention provides a method for judging the installation position of a short-focus projector, which comprises the steps of acquiring a projection image through a camera when the short-focus projector projects the image on a projection surface; acquiring the linear inclination rate of the projected image, and comparing the linear inclination rate with a preset linear inclination rate reference value; and when the linear inclination rate is inconsistent with the preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation. According to the invention, whether the installation position of the short-focus projector has deviation or not is judged according to the comparison between the linear inclination rate in the projected image and the preset linear tangent rate reference value, and the problem that the existing short-focus projector in the prior art cannot judge the installation position of the short-focus projector and is inconvenient for a user to use is solved.
The present invention also provides a system for determining an installation position of a short focus projector, which is applied to a short focus projector provided with a camera, as shown in fig. 2, and includes:
the acquisition module 100 is configured to acquire a projection image on a projection surface through a camera when the short-focus projector projects an original image on the projection surface;
the image processing module 200 is configured to obtain a linear inclination rate of a straight line in the projection image, where the straight line corresponds to a horizontal line of the original image, and compare the linear inclination rate with a preset linear inclination rate reference value;
and the prompting module 300 is configured to prompt a user that the installation position of the short-focus projector has a deviation when the linear inclination rate is inconsistent with the preset linear inclination rate reference value.
The judging system of the installation position of the short-focus projector comprises a prompting module and a judging module, wherein the prompting module specifically comprises:
the calculation unit is used for calculating the deflection angle of the short-focus projector relative to the normal of the installation surface according to the linear inclination rate when the linear inclination rate is inconsistent with a preset linear inclination rate reference value;
and the prompting unit is used for prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal line of the installation surface.
And the judging system of the installation position of the short-focus projector is characterized in that the optical axis of the camera and the optical axis of the short-focus projector are in the same plane.
And the judging system of the installation position of the short-focus projector is characterized in that the reference value of the linear inclination rate is the inclination rate of a straight line which is obtained by a camera and corresponds to a horizontal straight line in the original image when the short-focus projector is installed correctly.
It is obvious to those skilled in the art that the method and system of the above embodiments can be implemented by software plus necessary general hardware platform, and certainly can be implemented by hardware, but the former is a better implementation mode in many cases. Based on such understanding, the technical solutions of the present invention 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 invention.
Thus, the present invention also provides a short focus projector comprising:
a processor;
a memory for storing processor-executable instructions;
wherein the processor is configured to:
when the short-focus projector makes the original image on the projection surface, acquiring the projection image on the projection surface through the camera;
acquiring a linear inclination rate of a straight line corresponding to a horizontal straight line of the original image in the projected image, and comparing the linear inclination rate with a preset linear inclination rate reference value;
and when the linear inclination rate is inconsistent with the preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation.
In particular, the short focus projector may comprise one or more of the following components: processing components, memory, power components, multimedia components, audio components, interfaces for input/output (I/O), sensor components, and communication components.
The processing components typically control overall operation of the device, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing elements may include one or more processors to execute commands to perform all or a portion of the steps of the methods described above. Further, the processing component can include one or more modules that facilitate interaction between the processing component and other components. For example, the processing component may include a multimedia module to facilitate interaction between the multimedia component and the processing component.
The memory is configured to store various types of data to support operations at the device. Examples of such data include commands for any application or method operating on the device, contact data, phonebook data, messages, pictures, videos, and the like. The memory may be implemented by any type or combination of volatile or non-volatile memory devices, such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.
In an exemplary embodiment, the apparatus may be implemented by one or more Application Specific Integrated Circuits (ASICs), Digital Signal Processors (DSPs), Digital Signal Processing Devices (DSPDs), Programmable Logic Devices (PLDs), Field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.
In an exemplary embodiment, a non-transitory computer-readable storage medium, such as a memory, including commands executable by a processor of a device to perform the above method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It should be understood that equivalents and modifications of the technical solution and inventive concept thereof may occur to those skilled in the art, and all such modifications and alterations should fall within the scope of the appended claims.
Claims (8)
1. A method for judging the installation position of a short-focus projector is characterized by comprising the following steps:
when the short-focus projector projects an original image on a projection surface, acquiring a projection image on the projection surface through a camera;
acquiring a linear inclination rate of a straight line corresponding to a horizontal straight line of the original image in the projected image, and comparing the linear inclination rate with a preset linear inclination rate reference value;
when the linear inclination rate is inconsistent with a preset linear inclination rate reference value, prompting a user that the installation position of the short-focus projector has deviation;
when the straight line inclination rate is inconsistent with the preset straight line inclination rate reference value, prompting the user that the deviation exists in the installation position of the short-focus projector specifically comprises the following steps:
when the linear inclination rate is inconsistent with a preset linear inclination rate reference value, calculating a deflection angle of the short-focus projector relative to the normal direction of the mounting surface according to the linear inclination rate;
and prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal direction of the installation surface.
2. The method for determining the installation position of the short-focus projector according to claim 1, wherein the prompting that the installation position of the short-focus projector has a deviation according to the deflection angle of the short-focus projector relative to the normal direction of the installation surface specifically comprises:
when the deflection angle of the short-focus projector relative to the normal direction of the installation surface is smaller than zero degree, prompting a user that the short-focus projector deflects rightwards;
and when the deflection angle of the short-focus projector relative to the normal direction of the installation surface is larger than zero degree, prompting a user that the short-focus projector deflects leftwards.
3. The method for determining the installation position of the short-focus projector according to claim 1, wherein the calculating of the deflection angle of the short-focus projector with respect to the normal direction of the installation surface according to the linear inclination rate includes:
calculating the deflection angle of the short-focus projector corresponding to the linear inclination rate relative to the normal direction of the installation surface according to the corresponding relation between the linear inclination rate and the deflection angle of the short-focus projector relative to the normal direction of the installation surface; the corresponding relation between the linear inclination rate and the deflection angle of the short-focus projector relative to the normal direction of the installation surface is as follows:
wherein,，andall coefficients are constant, K is the linear inclination rate, and α is the deflection angle of the short-focus projector relative to the normal direction of the installation surface.
4. The short focus projector mounting position determination method according to claim 1, wherein an optical axis of the camera and an optical axis of a lens of the short focus projector are in the same plane.
5. The method for determining the installation position of the short-focus projector according to claim 1, wherein the reference value of the slope of the straight line is a slope of a straight line corresponding to a horizontal line in the original image in the projected image obtained by the camera when the short-focus projector is correctly installed.
6. A short-focus projector mounting position determination system is characterized by comprising:
the acquisition module is used for acquiring a projection image on the projection surface through the camera when the short-focus projector makes the original image on the projection surface;
the image processing module is used for acquiring the linear inclination rate of a straight line corresponding to the horizontal straight line of the original image in the projection image and comparing the linear inclination rate with a preset linear inclination rate reference value;
the prompting module is used for prompting a user that the installation position of the short-focus projector has deviation when the linear inclination rate is inconsistent with a preset linear inclination rate reference value;
the prompt module specifically comprises:
the calculation unit is used for calculating the deflection angle of the short-focus projector relative to the normal direction of the installation surface according to the linear inclination rate when the linear inclination rate is inconsistent with a preset linear inclination rate reference value;
and the prompting unit is used for prompting that the installation position of the short-focus projector has deviation according to the deflection angle of the short-focus projector relative to the normal direction of the installation surface.
7. The short focus projector mounting position determination system according to claim 6, wherein an optical axis of the camera and an optical axis of a lens of the short focus projector are in the same plane.
8. The system for determining the installation position of a short-focus projector according to claim 6, wherein the reference value of the linear inclination rate is an inclination rate of a straight line corresponding to a horizontal line in the original image in the image obtained by the camera when the short-focus projector is correctly installed.
Priority Applications (1)
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| CN104460197A (en) * | 2014-11-25 | 2015-03-25 | 深圳先进技术研究院 | Projector capable of automatically correcting geometric distortion and correcting method thereof |
| CN104935852A (en) * | 2015-06-25 | 2015-09-23 | 苏州市英富美欣科技有限公司 | Projection angle regulating method based on image analysis |
| CN105227881A (en) * | 2015-09-15 | 2016-01-06 | 海信集团有限公司 | A kind of projected picture correcting method and projector equipment |
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| JP4155890B2 (en) * | 2003-07-15 | 2008-09-24 | カシオ計算機株式会社 | Projector, projector tilt angle acquisition method, and projection image correction method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104460197A (en) * | 2014-11-25 | 2015-03-25 | 深圳先进技术研究院 | Projector capable of automatically correcting geometric distortion and correcting method thereof |
| CN104935852A (en) * | 2015-06-25 | 2015-09-23 | 苏州市英富美欣科技有限公司 | Projection angle regulating method based on image analysis |
| CN105227881A (en) * | 2015-09-15 | 2016-01-06 | 海信集团有限公司 | A kind of projected picture correcting method and projector equipment |
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