CN113965734A - Projection picture correction method, projection display system and related equipment - Google Patents
Projection picture correction method, projection display system and related equipment Download PDFInfo
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- CN113965734A CN113965734A CN202010699831.8A CN202010699831A CN113965734A CN 113965734 A CN113965734 A CN 113965734A CN 202010699831 A CN202010699831 A CN 202010699831A CN 113965734 A CN113965734 A CN 113965734A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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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
Abstract
The invention provides a projection picture correction method, which comprises the steps of projecting scanning lines to a screen through a projection terminal, sending projection picture coordinate information of the scanning lines on the projection picture to the screen, controlling at least four photoelectric sensors to carry out brightness detection by the screen, analyzing the screen to obtain the projection picture coordinate information of each photoelectric sensor when each photoelectric sensor is irradiated by the scanning lines, calculating and obtaining coordinate corresponding information of each photoelectric sensor by the screen according to the screen coordinate information and the projection picture coordinate information of each photoelectric sensor, sending the coordinate corresponding information to the projection terminal, calculating a transformation matrix between the current projection picture and the screen according to the coordinate corresponding information through the projection terminal, and using the transformation matrix as an input parameter for projection picture correction to realize the adaptation of the boundary of the projection picture and the boundary of the screen. Compared with the related technology, the projection picture correction method has the advantages of simple operation, simple operation process and high automatic correction efficiency of the projection picture.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to the field of projection technologies, and in particular, to a projection picture correction method, a projection display system, and a related device.
[ background of the invention ]
In real life, projection devices are used more and more widely. In order to ensure good projection and viewing effects, the projection picture of the projection apparatus needs to be corrected.
In the related art, a current projection picture to be corrected is photographed by a camera arranged on a projection device or an additional mobile terminal, image information to be corrected corresponding to the current projection picture to be corrected is acquired, comparison operation is performed on the image information to be corrected and preset screen plane information to acquire a transformation matrix between the projection picture to be corrected and a screen plane, and the projection picture to be corrected is adjusted according to the transformation matrix to enable the projection picture to be adapted to the screen plane.
However, in the related art, a user needs to shoot a projection picture to be corrected and acquire image information to be corrected first, which is inconvenient to operate and poor in user experience, and meanwhile, the process of comparing the image information to be corrected with preset screen plane information is complex and the calculation amount is large, so that the automatic correction efficiency of the projection picture is limited, and the projection picture is corrected slowly.
Therefore, there is a need to provide a new projection picture correction method, a projection display system and related apparatuses to solve the above technical problems.
[ summary of the invention ]
The invention aims to provide a projection picture correction method, a projection display system and related equipment thereof, which are used for solving the problem of low correction speed caused by inconvenient operation and large computation.
In order to achieve the above object, the present invention provides a method for correcting a projection image, which is applied to a projection terminal, and comprises the following steps:
step S11, the projection terminal projects scanning lines to a screen and sends the projection picture coordinate information of the scanning lines on the projection picture to the screen;
step S12, the projection terminal receives at least four sets of coordinate corresponding information; the coordinate corresponding information is corresponding relation information between screen coordinate information of the photoelectric sensor and projection picture coordinate information of the photoelectric sensor, which is obtained by calculation of the screen when the photoelectric sensor is irradiated by the scanning line;
step S13, the projection terminal calculates the transformation matrix between the current projection picture and the screen according to the acquired at least four sets of coordinate corresponding information;
and step S14, the projection terminal takes the transformation matrix as an input parameter for correcting the projection picture, and the adaptation of the boundary of the projection picture and the boundary of the screen is realized.
Preferably, in step S11, the projection terminal projects scanning lines to the screen in a manner of outputting frame by frame to control the scanning lines to scan the entire correction start picture, and sends the projection picture coordinate information of the scanning lines of each frame to the screen, and the scanning lines sequentially irradiate each of the photosensors during the scanning process.
Preferably, the step S11 includes:
the projection terminal projects a first scanning line to the screen in a frame-by-frame output mode so as to control the first scanning line to scan the whole correction starting picture along a first coordinate direction, and sends first coordinate information of the first scanning line of each frame corresponding to the first coordinate direction to the screen in real time, and the first scanning line sequentially irradiates each photoelectric sensor in the scanning process; and the combination of (a) and (b),
the projection terminal projects second scanning lines to the screen in a frame-by-frame output mode so as to control the second scanning lines to scan the whole correction starting picture along a second coordinate direction, second coordinate information of the second scanning lines of each frame corresponding to the second coordinate direction is sent to the screen in real time, and the second scanning lines sequentially irradiate on each photoelectric sensor in the scanning process; the second coordinate direction and the first coordinate direction are arranged in a crossed mode;
in step S13, the projection terminal calculates a transformation matrix between the current projection picture and the screen according to the at least four sets of the first coordinate correspondence information and the at least four sets of the second coordinate correspondence information.
The invention provides a projection picture correction method, which is applied to a screen and comprises the following steps:
step S21, the screen receives the scanning line projected by the projection terminal and receives the projection picture coordinate information of the scanning line on the projection picture;
step S22, the screen controls at least four photoelectric sensors to detect brightness, when one of the photoelectric sensors detects that the brightness is obviously increased compared with the ambient light, the screen analyzes and obtains the projection picture coordinate information of the scanning line currently irradiated on the photoelectric sensor as the projection picture coordinate information of the photoelectric sensor;
step S23, calculating to obtain coordinate corresponding information of each photoelectric sensor by the screen according to the screen coordinate information of each photoelectric sensor and the projection picture coordinate information of each photoelectric sensor;
and step S24, the screen sends the coordinate corresponding information to the projection terminal.
Preferably, before the step S21, the method further includes:
the screen receives a projection picture projected by the projection terminal, the screen judges whether all the photoelectric sensors detect that the brightness is obviously increased compared with the ambient light at the same time under the irradiation of the projection picture, if so, the current projection picture is calibrated to be a correction starting picture, and the calibration time is recorded to be the correction starting time;
in step S21, the screen receives the scan lines of each frame in a frame-by-frame receiving manner, and receives the projection picture coordinate information of the scan lines of each frame in real time;
the step S22 includes:
step S221, the screen controls at least four photoelectric sensors to detect brightness, when one of the photoelectric sensors receives the scanning line, the photoelectric sensor detects that the brightness is obviously increased compared with the ambient light, and the screen receives a high-level signal generated by the photoelectric sensor;
step S222, the screen obtains projection image coordinate information of the scanning line currently irradiated on the photosensor through analysis according to a time difference between the time when the photosensor generates the electrical signal and the correction start time and by combining projection image coordinate information of the scanning line of each frame, so as to serve as the projection image coordinate information of the photosensor.
Preferably, the step S221 includes:
when the photoelectric sensor receives a first scanning line, the screen receives a first high level generated by the photoelectric sensor; and the combination of (a) and (b),
when the photoelectric sensor receives a second scanning line, the screen receives a second high level generated by the photoelectric sensor;
the step S222 includes:
the screen calculates and obtains first coordinate information of a first scanning line irradiated on the photoelectric sensor in a first coordinate direction according to a time difference between the receiving time of the first high level and the correction starting time to serve as first projection picture coordinate information of the photoelectric sensor; and the combination of (a) and (b),
and the screen calculates and obtains second coordinate information of the second scanning line irradiating the photoelectric sensor in a second coordinate direction according to the time difference between the receiving time of the second high level and the correction starting time to serve as second projection picture coordinate information of the photoelectric sensor.
Preferably, the step S23 includes:
the screen calculates and obtains first coordinate corresponding information of each photoelectric sensor according to first projection picture coordinate information of each photoelectric sensor and first screen coordinate information of each photoelectric sensor; and the combination of (a) and (b),
the screen calculates and obtains second coordinate corresponding information of each photoelectric sensor according to second projection picture coordinate information of each photoelectric sensor and second screen coordinate information of each photoelectric sensor;
in the step S24, the screen transmits the first coordinate corresponding information and the second coordinate corresponding information to the projection terminal.
The invention provides a projection display system, which comprises a projection terminal, a screen and at least four photoelectric sensors, wherein the screen is in communication connection with the projection terminal;
the projection terminal is used for projecting scanning lines to the screen and sending projection picture coordinate information of the scanning lines on a projection picture to the screen; used for receiving at least four sets of coordinate corresponding information; the system comprises a projection screen, a screen and at least four sets of coordinate corresponding information, wherein the coordinate corresponding information is used for acquiring at least four sets of coordinate corresponding information; the transformation matrix is used as an input parameter for correcting the projection picture, and the boundary adaptation of the projection picture and the boundary of the screen is realized; and/or the presence of a gas in the gas,
the screen is used for receiving the scanning lines projected by the projection terminal and receiving the projection picture coordinate information of the scanning lines on the projection picture; the system comprises a plurality of photoelectric sensors, a control unit and a display unit, wherein the photoelectric sensors are used for controlling at least four photoelectric sensors to detect brightness, and when one of the photoelectric sensors detects that the brightness is obviously increased compared with ambient light, the projection picture coordinate information of a scanning line currently irradiated on the photoelectric sensor is analyzed and obtained to be used as the projection picture coordinate information of the photoelectric sensor; the system comprises a display screen, a photoelectric sensor, a display screen and a display screen, wherein the display screen is used for displaying the display screen; and the coordinate corresponding information is sent to the projection terminal.
The invention provides a projection display system, which comprises a processor and a memory, wherein a control program for the processor to execute is stored in the memory, and the control program realizes the steps of the projection picture correction method applied to the projection terminal and/or the steps of the projection picture correction method applied to the screen when being executed by the processor.
The present invention provides a computer-readable storage medium storing a computer program; the computer program, when executed by a processor, implements the steps of the projection picture correction method applied to a projection terminal of the present invention, and/or implements the steps of the projection picture correction method applied to a screen of the present invention.
Compared with the related art, in the projection picture correction method of the invention, the projection terminal projects the scanning line to the screen, and the coordinate information of the projection picture of the scanning line on the projection picture is sent to the screen, the screen controls at least four photoelectric sensors to detect the brightness, when one of the photoelectric sensors detects that the brightness is obviously increased compared with the ambient light, the screen analyzes and obtains the projection picture coordinate information of the photoelectric sensor, the screen calculates and obtains the coordinate corresponding information of each photoelectric sensor according to the screen coordinate information and the projection picture coordinate information of each photoelectric sensor and sends the coordinate corresponding information to the projection terminal, calculating a transformation matrix between the current projection picture and the screen according to the coordinate corresponding information through the projection terminal, the transformation matrix is used as an input parameter for correcting the projection picture, so that the adaptation of the boundary of the projection picture and the boundary of the screen is realized; according to the method, the projection image coordinate information of each photoelectric sensor can be obtained by directly and sequentially irradiating each photoelectric sensor through the scanning line, then the coordinate corresponding information is obtained according to the conversion relation between the preset screen coordinate information and the projection image coordinate information, the conversion matrix is obtained by calculation according to the coordinate corresponding information, the image information of the current projection image is not required to be obtained additionally, the operation process is simplified, only sequential scanning is needed, data processing operation is not required in a projector, the operation process is simplified, the automatic correction efficiency of the projection image is improved, and the user experience is effectively improved.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without inventive efforts, wherein:
FIG. 1 is a schematic flow chart of a projection image correction method applied to a projection terminal according to the present invention;
FIG. 2 is a schematic flow chart of a method for correcting a projection image applied to a screen according to the present invention;
FIG. 3 is a flowchart illustrating the step S22 in FIG. 2;
FIG. 4 is a schematic diagram of a projection display system according to the present invention;
FIG. 5 is a schematic diagram of a projection terminal projecting a projection image onto a screen according to the present invention;
fig. 6 is a schematic diagram of the projection terminal scanning the calibration start-up frame according to the present invention.
[ detailed description ] embodiments
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the 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 invention.
Referring to fig. 1, the present invention further provides a method for correcting a projection image applied to a projection terminal, where the method is applied to a projection terminal of a projection display system, and the method at least includes the following steps:
step S11, the projection terminal projects scanning lines to a screen and sends the projection picture coordinate information of the scanning lines on the projection picture to the screen in real time;
step S12, the projection terminal receives at least four sets of coordinate corresponding information; the coordinate corresponding information is corresponding relation information between screen coordinate information of the photoelectric sensor and projection picture coordinate information of the photoelectric sensor, which is obtained by calculation of the screen when the photoelectric sensor is irradiated by the scanning line;
step S13, the projection terminal calculates a transformation matrix between the boundary of the current projection picture and the boundary of the screen according to the acquired at least four sets of coordinate corresponding information;
and step S14, the projection terminal takes the transformation matrix as the input parameter for correcting the projection picture, and realizes the adaptation of the boundary of the projection picture and the boundary of the screen, namely, the projection picture is projected on the screen in a suitable form.
Referring to fig. 2, the present invention further provides a method for correcting a projection image applied to a screen of a projection display system, the method at least includes the following steps:
step S21, the screen receives the scanning line projected by the projection terminal and receives the projection picture coordinate information of the scanning line on the projection picture;
step S22, the screen controls at least four photoelectric sensors to detect brightness, when one of the photoelectric sensors detects that the brightness is obviously increased compared with the ambient light, the screen analyzes and obtains the projection picture coordinate information of the scanning line currently irradiated on the photoelectric sensor as the projection picture coordinate information of the photoelectric sensor;
step S23, calculating to obtain coordinate corresponding information of each photoelectric sensor by the screen according to the screen coordinate information of each photoelectric sensor and the projection picture coordinate information of each photoelectric sensor;
and step S24, the screen sends the coordinate corresponding information to the projection terminal.
As shown in fig. 3, more specifically, the step S22 includes:
step S221, the screen controls at least four photoelectric sensors to detect brightness, when one of the photoelectric sensors receives the scanning line, the photoelectric sensor detects that the brightness is obviously increased compared with the ambient light, and the screen receives a high-level signal generated by the photoelectric sensor;
step S222, the screen obtains projection image coordinate information of the scanning line currently irradiated on the photosensor through analysis according to a time difference between the time when the photosensor generates the electrical signal and the correction start time and by combining projection image coordinate information of the scanning line of each frame, so as to serve as the projection image coordinate information of the photosensor.
Referring to fig. 4, the present invention further provides a projection display system 100, which includes a projection terminal 1, a screen 2 communicatively connected to the projection terminal 1, and at least four photoelectric sensors 3 disposed on the screen.
In the present embodiment, the projection terminal 1 includes a projector 11, a controller 12, and a communication module 13.
Wherein, the projector 11 is a conventional projector, and the projector 11 can project a specific sequence of picture frame sequences to the screen 2 under the control of software; a geometric correction unit is arranged in the projector 11, the geometric correction unit can be realized on the projector 11 by using a special ASIC or FPGA, the geometric correction unit takes a conversion matrix between the screen and a picture to be corrected projected by the projector 11 as input, controls the projection picture to perform inverse deformation, and adjusts the boundary of the projection picture to be matched with the boundary of the screen 2 by combining the zooming of a control lens, namely, the projection picture is irradiated on the screen in a flush manner after the adjustment; the controller 12 may be an MCU/CPU of the projector 11, or may be another control unit, which may be specifically selected according to the requirements of practical applications.
The screen 2 includes a screen body 21 for the projection, a controller 22, and a communication module 23.
Wherein the screen body 21 is used as a projection reference plane, and the projection picture and the scanning line projected by the projection terminal 1 are projected on the screen body 21.
The controller 22 is configured to control the photoelectric sensor 3 to sense illuminance and detect an electrical signal output by the photoelectric sensor 3.
The communication module 23 may be directly integrated inside the controller 22, or may be externally connected to an embedded component of the controller 22; the communication module 23 of the screen 2 can be in communication connection with the communication module 13 in the projection terminal 1. The communication channel between the two is any one of a wireless channel, an infrared channel and a wired channel; the wireless channel is preferably any one of electromagnetic waves, Wifi, and bluetooth.
The photoelectric sensor 3 is used for detecting the change of brightness, and the detection window of the photoelectric sensor can be smaller through special design so as to ensure the precision of line detection. The photoelectric sensor 3 is controlled by the controller 22 on the screen 2, senses the illuminance of a specific position on the screen 2, and when light irradiates the photoelectric sensor 3, the photoelectric sensor 3 detects that the brightness is obviously increased compared with the ambient light, converts the light signal into an electric signal and transmits the electric signal to the screen 2.
It should be noted that the number of the photosensors 3 is not limited, and the photosensors may be set according to actual use requirements, and in order to improve the accuracy of automatic adjustment, more photosensors may be set; for example, in the present embodiment, the number of the photosensors 3 is four, four photosensors 3 are mounted on the screen body 21, and the mounting position of each photosensor 3 on the screen 2 determines the coordinates of the photosensor 3, that is, the screen coordinate information of each photosensor 3 on the screen body 21 is preset.
When the projection display system 100 described above applies the projection picture correction method according to the present invention:
the projection terminal 1 is configured to project a scan line to the screen 2, send projection image coordinate information of the scan line on a projection image to the screen 2, receive at least four sets of coordinate correspondence information, calculate a transformation matrix between the projection image and the screen according to the obtained at least four sets of coordinate correspondence information, and use the transformation matrix as an input parameter for projection image correction, so as to implement boundary adaptation between the projection image and the screen, that is, project the projection image on the screen in a suitable form.
The screen 2 is used for receiving the scanning lines projected by the projection terminal 1 and receiving the projection picture coordinate information of the scanning lines on the projection picture; the system is used for controlling at least four photoelectric sensors 3 to detect brightness, and when one of the photoelectric sensors 3 detects that the brightness is obviously increased compared with ambient light, the projection picture coordinate information of the scanning line currently irradiating on the photoelectric sensor 3 is obtained through analysis to be used as the projection picture coordinate information of the photoelectric sensor 3; the coordinate corresponding information of each photoelectric sensor 3 is obtained through calculation according to the screen coordinate information of each photoelectric sensor 3 and the projection image coordinate information of each photoelectric sensor 3; and is configured to send the coordinate correspondence information to the projection terminal 2.
To facilitate understanding of the above method, the following description will be made with reference to specific configurations of the projection display system shown in fig. 4 to 6:
first, as shown in fig. 5, the projector 11 of the projection terminal 1 projects a projection picture to the screen main body 21 of the screen 2, the projection picture projected by the projection terminal 1 is received by the screen 2, and the controller 22 of the screen 2 determines whether the four photosensors 3 detect that the brightness is significantly increased compared with the ambient light at the same time under the irradiation of the projection picture, and if so, the current projection picture is calibrated to be the correction start picture H0And recording the calibration time as the correction start time T0。
It should be noted that the projection image needs to cover all the photosensors 3 on the screen 21, and the projection image can be calibrated as the correction start image H0Therefore, in the present embodiment, the projection screen needs to cover four of the photosensors 3.
Secondly, the projector 11 projects scanning lines to the screen main body 21 and sends the projection picture coordinate information of the scanning lines on the projection picture to the screen; specifically, the projector 11 projects scanning lines to the screen main body 21 in a frame-by-frame output manner to control the scanning lines to scan the entire correction start picture H0The communication module 13 of the projection terminal 1 sends the projection image coordinate information of the scanning line of each frame to the screen 2, and the scanning line sequentially illuminates each of the photosensors 3 in the scanning process.
The screen body 21 receives the scanning lines projected by the projector 11, and the communication module 23 of the screen 2 receives the projection picture coordinate information of the scanning lines on the projection picture; the screen body 21 receives the scan lines of each frame in a frame-by-frame receiving manner, and the communication module 23 receives projection picture coordinate information of the scan lines of each frame.
The screen 2 receives the scanning lines of each frame corresponding to the correction starting picture H through the communication module 230And receives the high level generated by each of the photosensors 3 through the controller 22.
In the second step, more specifically, as shown in fig. 6(a),
the projector 11 projects a first scanning line P to the screen main body 21 so as to output frame by framexTo control the first scanning line PxScanning the entire correction start picture H in the first coordinate direction (i.e., X-axis direction)0The communication module 13 converts the first scanning line P of each framexSending first coordinate information corresponding to the first coordinate direction to the communication module 23, wherein the first scanning line P is in a scanning processxSequentially irradiate each of the photosensors 3.
As shown in fig. 6(b), the projector 11 projects the second scanning line P to the screen 2 in a manner of outputting frame by frameyTo control the second scanning line PyScanning the entire correction start picture H in the second coordinate direction (i.e., Y-axis direction)0The communication module 11 transmits the second scanning line P of each frameySecond coordinate information corresponding to the second coordinate direction is sent to the communication module 23, and the second scanning line P is scanned in the scanning processySequentially irradiating the photoelectric sensors; wherein the second coordinate direction (Y-axis direction) is arranged crosswise to the first coordinate direction (X-axis direction).
Thirdly, the controller 22 of the screen 2 controls the four photoelectric sensors 3 to perform brightness detection, and when one of the photoelectric sensors 3 detects that the brightness is significantly increased compared with the ambient light, the controller 22 analyzes and obtains the projection picture coordinate information of the scanning line currently irradiated on the photoelectric sensor 3 to serve as the projection picture coordinate information of the photoelectric sensor 3.
Specifically, the controller 22 controls four of the photosensors 3 to perform brightness detection, when one of the photosensors 3 receives the scan line, the photosensor 3 detects that the brightness is significantly increased compared with the ambient light and generates a high level signal, and the controller 22 receives the high level signal generated by the photosensor 3.
The controller 22 generates an electric signal according to the time of the photoelectric sensor 3 and the correction start time T0And analyzing and obtaining the projection picture coordinate information of the scanning line irradiated on the photoelectric sensor 3 in the current year as the projection picture coordinate information of the photoelectric sensor by combining the projection picture coordinate information of the scanning line of each frame.
Further, in the present embodiment, when one of the photosensors 3 receives the first scanning line PxWhen the controller 22 receives the first high level generated by the photoelectric sensor 3, the controller 22 starts the calibration according to the receiving time of the first high level and the calibration start time T0The time difference between the first scanning line and the second scanning line is calculated to obtain the first scanning line P currently irradiating on the photoelectric sensor 3xFirst coordinate information in the first coordinate direction (X-axis direction) as first projection screen coordinate information of the photosensor 3; when one of the photoelectric sensors 3 receives the second scanning line PyThen, the controller 22 receives the second high level generated by the photoelectric sensor 3, and the controller 22 starts the calibration according to the receiving time of the second high level and the calibration start time T0The time difference between the two scanning lines is calculated to obtain the second scanning line P currently irradiating on the photoelectric sensor 3ySecond coordinate information in a second coordinate direction (Y-axis direction) is used as second projection screen coordinate information of the photosensor 3.
Fourthly, the controller 22 of the screen 2 calculates and obtains coordinate corresponding information of each of the photoelectric sensors 3 according to the screen coordinate information of each of the photoelectric sensors 3 and the projection image coordinate information of each of the photoelectric sensors 3; the communication module 23 of the screen 2 sends the coordinate corresponding information to the projection terminal 1, and the communication module 13 of the projection terminal 1 receives four sets of the coordinate corresponding information.
Specifically, the controller 22 calculates and obtains first coordinate corresponding information of each of the photosensors 3 according to a corresponding relationship between first projection image coordinate information of each of the photosensors 3 and first screen coordinate information of each of the photosensors 3; the controller 22 calculates and obtains second coordinate corresponding information of each of the photosensors 3 according to a corresponding relationship between the second projection image coordinate information of each of the photosensors 3 and the second screen coordinate information of each of the photosensors 3.
The communication module 23 sends four sets of information corresponding to the first coordinates and four sets of information corresponding to the second coordinates of the four photoelectric sensors 3 to the projection terminal 1; the communication module 13 of the projection terminal 1 receives the four sets of first coordinate correspondence information and the four sets of second coordinate correspondence information.
Fifthly, the controller 12 of the projection terminal 1 calculates a transformation matrix between the current projection picture and the screen according to the four sets of the coordinate correspondence information.
Specifically, the controller 12 calculates a transformation matrix between the current projection picture and the screen according to the four sets of the acquired first coordinate corresponding information and the four sets of the acquired second coordinate corresponding information.
Sixthly, the projection terminal 1 uses the transformation matrix as an input parameter for correcting the projection picture, specifically, the geometric correction unit of the projector 11 controls the projection picture to perform inverse deformation according to the transformation matrix, and combines with the zoom of the control lens to realize the adaptation of the boundary of the projection picture to the boundary of the screen 2, that is, the projection picture is irradiated on the screen main body 21 in a flush manner after adjustment.
The present invention provides a computer-readable storage medium storing a computer program which, when executed by a processor, implements the steps of the projection picture correction method applied to a projection terminal of the present invention.
The invention provides a projection display system, which comprises a projection terminal, a screen and at least four photoelectric sensors, wherein the screen is in communication connection with the projection terminal;
the invention provides a projection display system, which comprises a processor and a memory, wherein a control program for the processor to execute is stored in the memory, and the control program realizes the steps of the projection picture correction method applied to the projection terminal and/or the steps of the projection picture correction method applied to the screen when being executed by the processor.
The present invention provides a computer-readable storage medium storing a computer program; the computer program, when executed by a processor, implements the steps of the projection picture correction method applied to a projection terminal of the present invention, and/or implements the steps of the projection picture correction method applied to a screen of the present invention.
Compared with the related art, in the projection picture correction method of the invention, the projection terminal projects the scanning line to the screen, and the coordinate information of the projection picture of the scanning line on the projection picture is sent to the screen, the screen controls at least four photoelectric sensors to detect the brightness, when one of the photoelectric sensors detects that the brightness is obviously increased compared with the ambient light, the screen analyzes and obtains the projection picture coordinate information of the photoelectric sensor, the screen calculates and obtains the coordinate corresponding information of each photoelectric sensor according to the screen coordinate information and the projection picture coordinate information of each photoelectric sensor and sends the coordinate corresponding information to the projection terminal, calculating a transformation matrix between the current projection picture and the screen according to the coordinate corresponding information through the projection terminal, the transformation matrix is used as an input parameter for correcting the projection picture, so that the adaptation of the boundary of the projection picture and the boundary of the screen is realized; according to the method, the projection image coordinate information of each photoelectric sensor can be acquired by directly and sequentially irradiating each photoelectric sensor through the scanning line, a projector is not required to send the coordinate information to a screen in a communication mode, so that the mode for acquiring the coordinate information by the screen is simpler and faster, the coordinate corresponding information is acquired according to the conversion relation between the preset screen coordinate information and the projection image coordinate information, the conversion matrix is obtained by calculation according to the coordinate corresponding information, the image information of the current projection image is not required to be acquired additionally, the operation process is simplified, only the sequential scanning is required, the data processing operation is not required in the projector, the operation process is simplified, the automatic correction efficiency of the projection image is improved, and the user experience is effectively improved.
While the foregoing is directed to embodiments of the present invention, it will be understood by those skilled in the art that various changes may be made without departing from the spirit and scope of the invention.
Claims (10)
1. A projection picture correction method is applied to a projection terminal and is characterized by comprising the following steps:
step S11, the projection terminal projects scanning lines to a screen and sends the projection picture coordinate information of the scanning lines on the projection picture to the screen;
step S12, the projection terminal receives at least four sets of coordinate corresponding information; the coordinate corresponding information is corresponding relation information between screen coordinate information of the photoelectric sensor and projection picture coordinate information of the photoelectric sensor, which is obtained by calculation of the screen when the photoelectric sensor is irradiated by the scanning line;
step S13, the projection terminal calculates the transformation matrix between the current projection picture and the screen according to the acquired at least four sets of coordinate corresponding information;
and step S14, the projection terminal takes the transformation matrix as an input parameter for correcting the projection picture, and the adaptation of the boundary of the projection picture and the boundary of the screen is realized.
2. The method according to claim 1, wherein in step S11, the projection terminal projects scanning lines to the screen in a frame-by-frame output manner to control the scanning lines to scan the entire correction start picture, and sends projection picture coordinate information of the scanning lines of each frame to the screen, and the scanning lines sequentially illuminate each of the photosensors during scanning.
3. The projection picture correction method according to claim 2, wherein the step S11 includes:
the projection terminal projects a first scanning line to the screen in a frame-by-frame output mode so as to control the first scanning line to scan the whole correction starting picture along a first coordinate direction, and sends first coordinate information of the first scanning line of each frame corresponding to the first coordinate direction to the screen in real time, and the first scanning line sequentially irradiates each photoelectric sensor in the scanning process; and the combination of (a) and (b),
the projection terminal projects second scanning lines to the screen in a frame-by-frame output mode so as to control the second scanning lines to scan the whole correction starting picture along a second coordinate direction, second coordinate information of the second scanning lines of each frame corresponding to the second coordinate direction is sent to the screen in real time, and the second scanning lines sequentially irradiate on each photoelectric sensor in the scanning process; the second coordinate direction and the first coordinate direction are arranged in a crossed mode;
in step S13, the projection terminal calculates a transformation matrix between the current projection picture and the screen according to the at least four sets of the first coordinate correspondence information and the at least four sets of the second coordinate correspondence information.
4. A projection picture correction method, which is applied to a screen, is characterized by comprising the following steps:
step S21, the screen receives the scanning line projected by the projection terminal and receives the projection picture coordinate information of the scanning line on the projection picture;
step S22, the screen controls at least four photoelectric sensors to detect brightness, when one of the photoelectric sensors detects that the brightness is obviously increased compared with the ambient light, the screen analyzes and obtains the projection picture coordinate information of the scanning line currently irradiated on the photoelectric sensor as the projection picture coordinate information of the photoelectric sensor;
step S23, calculating to obtain coordinate corresponding information of each photoelectric sensor by the screen according to the screen coordinate information of each photoelectric sensor and the projection picture coordinate information of each photoelectric sensor;
and step S24, the screen sends the coordinate corresponding information to the projection terminal.
5. The projection picture correction method according to claim 4, further comprising, before said step S21:
the screen receives a projection picture projected by the projection terminal, the screen judges whether all the photoelectric sensors detect that the brightness is obviously increased compared with the ambient light at the same time under the irradiation of the projection picture, if so, the current projection picture is calibrated to be a correction starting picture, and the calibration time is recorded to be the correction starting time;
in step S21, the screen receives the scan lines of each frame in a frame-by-frame receiving manner, and receives the projection picture coordinate information of the scan lines of each frame in real time;
the step S22 includes:
step S221, the screen controls at least four photoelectric sensors to detect brightness, when one of the photoelectric sensors receives the scanning line, the photoelectric sensor detects that the brightness is obviously increased compared with the ambient light, and the screen receives a high-level signal generated by the photoelectric sensor;
step S222, the screen obtains projection image coordinate information of the scanning line currently irradiated on the photosensor through analysis according to a time difference between the time when the photosensor generates the electrical signal and the correction start time and by combining projection image coordinate information of the scanning line of each frame, so as to serve as the projection image coordinate information of the photosensor.
6. The method according to claim 5, wherein the step S221 comprises:
when the photoelectric sensor receives a first scanning line, the screen receives a first high level generated by the photoelectric sensor; and the combination of (a) and (b),
when the photoelectric sensor receives a second scanning line, the screen receives a second high level generated by the photoelectric sensor;
the step S222 includes:
the screen calculates and obtains first coordinate information of a first scanning line irradiated on the photoelectric sensor in a first coordinate direction according to a time difference between the receiving time of the first high level and the correction starting time to serve as first projection picture coordinate information of the photoelectric sensor; and the combination of (a) and (b),
and the screen calculates and obtains second coordinate information of the second scanning line irradiating the photoelectric sensor in a second coordinate direction according to the time difference between the receiving time of the second high level and the correction starting time to serve as second projection picture coordinate information of the photoelectric sensor.
7. The projection picture correction method according to claim 6, wherein the step S23 includes:
the screen calculates and obtains first coordinate corresponding information of each photoelectric sensor according to first projection picture coordinate information of each photoelectric sensor and first screen coordinate information of each photoelectric sensor; and the combination of (a) and (b),
the screen calculates and obtains second coordinate corresponding information of each photoelectric sensor according to second projection picture coordinate information of each photoelectric sensor and second screen coordinate information of each photoelectric sensor;
in the step S24, the screen transmits the first coordinate corresponding information and the second coordinate corresponding information to the projection terminal.
8. A projection display system comprises a projection terminal, a screen connected with the projection terminal in a communication way, and at least four photoelectric sensors arranged on the screen,
the projection terminal is used for projecting scanning lines to the screen and sending projection picture coordinate information of the scanning lines on a projection picture to the screen; used for receiving at least four sets of coordinate corresponding information; the system comprises a projection screen, a screen and at least four sets of coordinate corresponding information, wherein the coordinate corresponding information is used for acquiring at least four sets of coordinate corresponding information; the transformation matrix is used as an input parameter for correcting the projection picture, and the boundary adaptation of the projection picture and the boundary of the screen is realized; and/or the presence of a gas in the gas,
the screen is used for receiving the scanning lines projected by the projection terminal and receiving the projection picture coordinate information of the scanning lines on the projection picture; the system comprises a plurality of photoelectric sensors, a control unit and a display unit, wherein the photoelectric sensors are used for controlling at least four photoelectric sensors to detect brightness, and when one of the photoelectric sensors detects that the brightness is obviously increased compared with ambient light, the projection picture coordinate information of a scanning line currently irradiated on the photoelectric sensor is analyzed and obtained to be used as the projection picture coordinate information of the photoelectric sensor; the system comprises a display screen, a photoelectric sensor, a display screen and a display screen, wherein the display screen is used for displaying the display screen; and the coordinate corresponding information is sent to the projection terminal.
9. A projection display system comprising a processor and a memory, the memory storing therein a control program for execution by the processor, wherein the control program when executed by the processor implements the steps of the projection picture correction method applied to a projection terminal of any one of claims 1 to 3 above and/or implements the steps of the projection picture correction method applied to a screen of any one of claims 4 to 7 above.
10. A computer-readable storage medium storing a computer program, wherein the computer program, when executed by a processor, implements the steps of the projection picture correction method applied to a projection terminal according to any one of claims 1 to 3 above, and/or implements the steps of the projection picture correction method applied to a screen according to any one of claims 4 to 7 above.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010699831.8A CN113965734A (en) | 2020-07-20 | 2020-07-20 | Projection picture correction method, projection display system and related equipment |
| PCT/CN2021/106673 WO2022017262A1 (en) | 2020-07-20 | 2021-07-16 | Projection picture correction method, projection display system and related device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010699831.8A CN113965734A (en) | 2020-07-20 | 2020-07-20 | Projection picture correction method, projection display system and related equipment |
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| CN113965734A true CN113965734A (en) | 2022-01-21 |
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| CN117570853A (en) * | 2024-01-16 | 2024-02-20 | 深圳新智联软件有限公司 | Method, device, equipment and storage medium for calculating four-point coordinates in projection interface |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115514944A (en) * | 2022-09-21 | 2022-12-23 | 南京创斐信息技术有限公司 | Intelligent household projection angle correction system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7001023B2 (en) * | 2003-08-06 | 2006-02-21 | Mitsubishi Electric Research Laboratories, Inc. | Method and system for calibrating projectors to arbitrarily shaped surfaces with discrete optical sensors mounted at the surfaces |
| CN101500172B (en) * | 2009-02-20 | 2012-11-07 | 四川华控图形科技有限公司 | Projection automatic geometric correction method based on optical sensor |
| CN101651808B (en) * | 2009-08-19 | 2011-08-10 | 吕雪峰 | Multiple projection synthetic optical projection system and projection method thereof |
| CN104869336A (en) * | 2013-12-27 | 2015-08-26 | 合肥市艾塔器网络科技有限公司 | Adaptive projection control system and method thereof |
| JP6418265B2 (en) * | 2017-03-23 | 2018-11-07 | セイコーエプソン株式会社 | Correction control apparatus, correction method, and projector |
| CN109194939A (en) * | 2018-08-29 | 2019-01-11 | 明基智能科技（上海）有限公司 | Frame correction method and projector system |
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| CN117570853A (en) * | 2024-01-16 | 2024-02-20 | 深圳新智联软件有限公司 | Method, device, equipment and storage medium for calculating four-point coordinates in projection interface |
| CN117570853B (en) * | 2024-01-16 | 2024-04-09 | 深圳新智联软件有限公司 | Method, device, equipment and storage medium for calculating four-point coordinates in projection interface |
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