CN113890626A - Dispersion correction method, dispersion correction device, laser television and storage medium - Google Patents
Dispersion correction method, dispersion correction device, laser television and storage medium Download PDFInfo
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Abstract
The application discloses a dispersion correction method, a dispersion correction device, a laser television and a storage medium, wherein the method comprises the following steps: respectively generating red, green and blue checkerboard cards matched with a screen of a laser television, and respectively projecting the red, green and blue checkerboard cards to the screen through an optical component of the laser television; constructing a first coordinate system based on the screen, and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system; determining dispersion correction parameters according to the deviation between the first angle point coordinates of the checkerboard cards with different colors; and according to the dispersion correction parameters, carrying out coordinate correction on the three-primary-color pixels of the image to be projected to the screen. According to the method and the device, the deviation of the corner point coordinates of the red, green and blue checkerboard cards projected to the screen of the laser television is obtained, the coordinates of the three primary color pixels of the image projected to the screen are corrected, and the dispersion problem is improved.
Description
Technical Field
The present application relates to the field of laser projection technologies, and in particular, to a dispersion correction method and apparatus, a laser television, and a storage medium.
Background
The laser television and the micro-projection product adopt a laser light source and an ultra-short-focus projection technology for imaging, the laser television is provided with a special projection screen, and can receive projection display equipment of broadcast television programs or internet television programs, and the micro-projection product has small volume, is convenient to carry, can quickly project images, and is widely used.
Since the light with different colors has different wavelengths and the refractive index of the optical element is different due to the different wavelengths of the light, the light of R, G, B three primary colors emitted by the laser television light source is separated and dispersed after passing through the optical lens, and the laser television using the three-color laser is particularly obvious. The color dispersion affects the display quality of the image, and causes the problems of poor color purity and poor definition of the displayed image, for example, the image should be a white character with black background, and the edge of the white character will show red or green color.
Disclosure of Invention
The embodiment of the application provides a dispersion correction method and device, a laser television and a storage medium.
Other features and advantages of the present application will be apparent from the following detailed description, or may be learned by practice of the application.
According to a first aspect of the embodiments of the present application, there is provided a dispersion correction method applied to a laser television, where the laser television includes a screen, the method including:
respectively generating red, green and blue checkerboard graphic cards matched with the screen, and respectively projecting the red, green and blue checkerboard graphic cards to the screen through an optical component of the laser television;
constructing a first coordinate system based on the screen, and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system;
determining dispersion correction parameters according to the deviation between the first angle point coordinates of the checkerboard cards with different colors;
and according to the dispersion correction parameters, carrying out coordinate correction on the three-primary-color pixels of the image to be projected to the screen.
In some embodiments of the present application, based on the foregoing solution, the respectively obtaining first angular coordinates of the red, green and blue checkerboard cards in the first coordinate system includes:
respectively projecting the red, green and blue checkerboard pattern cards to the screen through an optical component of the laser television to obtain respective screen projection pictures of the red, green and blue checkerboard pattern cards;
capturing, by a video camera, a camera image containing the screen projection;
constructing a second coordinate system based on the camera image, and respectively acquiring second corner point coordinates of the red, green and blue checkerboard graphs in the second coordinate system;
acquiring a first reference coordinate of a preset screen reference point in the first coordinate system, and acquiring a second reference coordinate of the screen reference point in the second coordinate system;
acquiring perspective transformation parameters of the camera according to a second reference coordinate of the screen reference point in the second coordinate system and a first reference coordinate of the screen reference point in the first coordinate system;
and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system according to the perspective transformation parameters and the second corner coordinates.
In some embodiments of the present application, based on the foregoing solution, the method further comprises:
selecting one color from red, green and blue as a reference color;
and dividing the red, green and blue checkerboard cards into reference color checkerboard cards and non-reference color checkerboard cards according to the reference colors.
In some embodiments of the present application, based on the foregoing solution, the obtaining the first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system respectively includes:
acquiring a first reference color corner point coordinate of the reference color checkerboard pattern card in the first coordinate system;
acquiring first non-reference color corner point coordinates of the non-reference color checkerboard card in the first coordinate system;
determining dispersion correction parameters according to deviations between the first angular point coordinates of the checkerboard cards of different colors, including:
and determining the difference value between the coordinates of the first non-reference color corner point and the coordinates of the first reference color corner point, and taking the difference value as the dispersion correction parameter.
In some embodiments of the present application, based on the foregoing solution, the performing, according to the dispersion correction parameter, coordinate correction on three primary color pixels of an image to be projected onto the screen includes:
acquiring a reference coordinate of a reference color pixel in the image to be projected to the screen in the first coordinate system;
and determining the updated coordinates of the non-reference chromatic pixels in the image to be projected to the screen in the first coordinate system according to the reference coordinates and the dispersion correction parameters.
In some embodiments of the present application, based on the foregoing solution, the generating the red, green and blue checkerboard cards matched with the screen respectively includes:
acquiring the resolution of the screen;
and respectively generating the red, green and blue checkerboard cards with the same resolution as that of the screen.
In some embodiments of the present application, based on the foregoing solution, the acquiring the second reference coordinate of the screen reference point in the second coordinate system includes:
performing edge detection on the camera image, and identifying the vertex of the screen;
determining second reference coordinates of vertices of the screen in the second coordinate system.
According to a second aspect of the embodiments of the present application, there is provided a dispersion correction apparatus applied to a laser television set, the laser television set including a screen, the apparatus including:
the picture card acquisition unit is used for respectively generating red, green and blue checkerboard picture cards matched with the screen and respectively projecting the red, green and blue checkerboard picture cards to the screen through an optical component of the laser television;
the first coordinate acquisition unit is used for constructing a first coordinate system based on the screen and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system;
a correction parameter obtaining unit, configured to determine a dispersion correction parameter according to a deviation between the first angle coordinates of the checkerboard cards of different colors;
and the correction unit is used for carrying out coordinate correction on the three-primary-color pixels of the image to be projected to the screen according to the dispersion correction parameters.
According to a third aspect of embodiments of the present application, there is provided a laser television, including:
a screen;
an optical assembly for projecting an image onto the screen; and
a dispersion correcting device as described in the second aspect above.
According to a fourth aspect of embodiments of the present application, there is provided a computer-readable storage medium comprising a program or instructions which, when executed, is configured to perform the dispersion correction method of the first aspect.
According to the embodiment of the application, the deviation of the corner point coordinates of the red, green and blue checkerboard cards projected to the screen of the laser television is obtained, the coordinates of the three primary color pixels of the image projected to the screen are corrected, and the dispersion problem is improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:
fig. 1 is a schematic flow chart of a dispersion correction method according to an embodiment of the present application.
Fig. 2 is a schematic diagram of a checkerboard card of red, green, and blue provided in an embodiment of the present application.
Fig. 3 is a flowchart illustrating a method for obtaining a first corner coordinate according to an embodiment of the present disclosure.
Fig. 4 is a schematic diagram of a camera image according to an embodiment of the present application.
Fig. 5 is a schematic diagram of a laser projection according to an embodiment of the present application.
Fig. 6 is a schematic structural diagram of a dispersion correction apparatus according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the subject matter of the present application can be practiced without one or more of the specific details, or with other methods, components, devices, steps, and so forth. In other instances, well-known methods, devices, implementations, or operations have not been shown or described in detail to avoid obscuring aspects of the application.
The block diagrams shown in the figures are functional entities only and do not necessarily correspond to physically separate entities. I.e. these functional entities may be implemented in the form of software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor means and/or microcontroller means.
The flow charts shown in the drawings are merely illustrative and do not necessarily include all of the contents and operations/steps, nor do they necessarily have to be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
In the description of the present application, it is to be understood that the terms "second", "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "second" or "first" may explicitly or implicitly include one or more of that feature. In the description of the present application, "a plurality" means two or more unless otherwise specified.
The optical assembly of the laser television comprises a light source assembly, a light modulation assembly and a lens. The light source component comprises a light-emitting device and a lens, wherein the light-emitting device can be a full three-color laser or a laser matched with a color wheel as long as the requirements on corresponding wavelength and brightness are met. The light modulation component can adopt a digital micro-mirror device DMD (digital micro-mirror device), and the DMD modulates the light output by the light source component according to the image display information. The lens projects and displays the modulated light on a screen.
A Digital Light Processor (DLP) decodes an image to be projected onto a screen, converts image color information into Digital image signals in red, green, and blue formats (RGB), which reflect values of respective pixel points in a red channel, a green channel, and a blue channel of the image, and the values of the pixel points at the same positions in the red channel, the green channel, and the blue channel are RGB values of the image at the pixel points.
The DMD contains millions of pixel cells, each of which can be considered to correspond to a pixel in an image, each pixel comprising a micromirror plate that includes "on" and "off" states. The incident light reflected out by the micro lens in the 'on' state is projected on a screen through the projection lens; while incident light reflected on the micromirror in the "off" state is absorbed by the light absorber.
The micro lens can be switched on and off tens of thousands of times per second, and different gray scales can be generated by controlling the switching time of the micro lens. The on time is long and the off time is short, the generated gray pixels are light, the off time is long and the on time is short, the generated gray pixels are deep, and the DMD micro lens can reflect 1024 gray levels to generate a gray image.
When the laser television works, the light source component generates red, green and blue tricolor light, and the tricolor light is irradiated on the DMD according to a certain sequence through the color wheel. When red light is incident on the DMD, the tilting of the respective micromirror in the micromirror array to "on" is controlled according to the position and intensity that the red pixels of the image should display (i.e., according to the value of each pixel in the red channel corresponding to the image), as is the operation of green and blue light. Due to the visual inertia of human eyes, the three primary colors irradiated on the same pixel point in high-speed rotation are mixed and superposed to form a color, and the human eyes can finally see a full-color image.
Fig. 1 is a schematic flowchart of a dispersion correction method provided in an embodiment of the present application, and is applied to a laser television, where the laser television includes a screen, and the method includes:
step 110: and respectively generating red, green and blue checkerboard cards matched with the screen, and respectively projecting the red, green and blue checkerboard cards to the screen through an optical component of the laser television.
Fig. 2 is a schematic view of a red, green, and blue checkerboard card provided in this embodiment of the application, as shown in fig. 2, the card represents the red, green, and blue checkerboard card from left to right, the checkerboard card has a plurality of shaded squares, the shaded squares represent color blocks, all the shaded squares of one checkerboard card are filled with one of red, green, and blue colors, for example, all the color blocks of the blue checkerboard card are blue. The vertexes of all the color blocks in the checkerboard card form the angular points of the checkerboard card.
In the embodiment of the application, the red, green and blue checkerboard cards are mxn checkerboard cards, that is, the size and number of the color blocks in the checkerboard card of each color are the same.
Step 120: a first coordinate system is established based on a screen, and first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system are respectively obtained.
Assuming that the resolution of the screen is screen height and screen width, when the first coordinate system is constructed based on the screen, if the position of the center of the screen is set as the origin (0,0) of the first coordinate system, the X-axis is horizontally directed to the right, and the Y-axis is vertically directed downward to establish the first coordinate system, the offset amounts of the four vertices of the screen are (screen width/2) in the horizontal direction and (screen height/2) in the vertical direction. For a 4K resolution laser television, the Screen height is 2160, and the Screen Width et al is 3840.
In specific implementation, the camera image is binarized respectively to obtain a grayscale camera image, and then the positions of the vertexes of the color blocks in the checkerboard card are detected to obtain the coordinates of the corner points of the checkerboard card in the first coordinate.
Step 130: and determining dispersion correction parameters according to the deviation between the first angle point coordinates of the checkerboard cards with different colors.
When the sizes and the numbers of the color blocks in the red, green and blue checkerboard cards are the same, the color blocks at the same positions in different checkerboard cards are projected onto the screen through the same optical assembly theoretically, and the position coordinates of the color blocks at the same positions in different checkerboard cards on the screen should be the same; however, when the checkerboard cards of red, green, and blue are projected, the light of different colors has different wavelengths, and the refractive index of the optical element varies according to the wavelength of the light, so that the positions of the color blocks at the same position in the checkerboard cards of different colors on the screen are different, that is, the first angular point coordinates of the checkerboard cards of different colors have deviations.
Step 140: and according to the dispersion correction parameters, carrying out coordinate correction on the three-primary-color pixels of the image to be projected to the screen.
And if the red, green and blue light is projected from the same position and passes through the lens, the display positions of the red, green and blue light in the screen cannot be completely superposed and deviate due to different refractive indexes, and different coordinate values are respectively used for the red, green and blue pixels, namely the coordinate positions before the red, green and blue lights are incident are different, so that the positions after refraction are superposed as much as possible, and the dispersion phenomenon is reduced or avoided as much as possible.
In the corresponding concrete implementation, the DLP converts the image color information to be projected to the screen into RGB values of each pixel point in the image by combining the working principle of the laser assembly, and the values of each pixel point in the red channel, the green channel and the blue channel corresponding to the image can be obtained. And (3) combining the dispersion correction parameters to perform coordinate correction on the pixels in the original red channel, the original green channel and the original blue channel, for example, performing position transformation on each pixel point in the green channel and the blue channel by taking the red channel as a reference, which is equivalent to performing transformation on the RGB value of each pixel point in the image. For example, the first pixel in the original green channel and the original blue channel is moved to the second pixel position, and then the first pixel of the corrected image is formed by overlapping the first pixel in the original red channel, the second pixel in the original green channel, and the second pixel in the original blue channel.
The DMD changes the intensity of the color (realizes different color levels) by controlling the inclination and the opening time of the micromirror in the micromirror array according to the RGB values of each pixel of the corrected image, so that the color at the position where the color is originally deviated can be weakened or covered by other colors, thereby visually weakening the dispersion problem.
Fig. 3 is a schematic flowchart of a method for acquiring coordinates of a first corner point according to an embodiment of the present disclosure, where as shown in fig. 3, the method at least includes the following steps.
Step 310: and respectively projecting the red, green and blue checkerboard pattern cards to a screen through an optical component of the laser television to obtain respective screen projection pictures of the red, green and blue checkerboard pattern cards.
It should be noted that the screen only displays a single checkerboard card at a time, and thus displays the checkerboard cards in three times.
Step 320: a camera image containing a screen projection is captured by a video camera.
In specific implementation, the camera may be deployed on a laser television host, and a wired manner such as USB is adopted to transmit the camera image to the laser television host for subsequent processing; the camera can also be transmitted to the laser television host in a wireless mode by utilizing mobile shooting equipment such as a mobile phone camera and the like without being arranged on the laser television host, so that subsequent processing is facilitated.
The picture camera takes pictures facing to the screen, and the whole screen is contained in the shot pictures. Fig. 4 is a schematic diagram of a camera image according to an embodiment of the present disclosure, and as shown in fig. 4, the camera image includes not only a checkerboard card but also a frame of a screen.
Step 330: and constructing a second coordinate system based on the camera image, and respectively acquiring second corner point coordinates of the red, green and blue checkerboard pattern cards in the second coordinate system.
The position of the center of the camera image may be set as the origin (0,0) of the first coordinate system, with the X-axis horizontally to the right and the Y-axis vertically downward establishing the second coordinate system.
Step 340: and acquiring a first reference coordinate of a preset screen reference point in a first coordinate system, and acquiring a second reference coordinate of the screen reference point in a second coordinate system.
The screen reference point is a reference point of a screen of the laser television, exists in a physical environment of a first coordinate system where the screen is located, and is also included in a camera image when the camera captures a screen projection picture. In particular implementations, reference points on the screen border or reference points set off the screen may be selected, etc.
Step 350: and acquiring perspective transformation parameters of the camera according to the second reference coordinate of the screen reference point in the second coordinate system and the first reference coordinate in the first coordinate system.
Since the screen reference point exists in both the camera image and the physical environment of the screen, the perspective transformation parameter of the camera, i.e. the transformation parameter of the two coordinates, can be calculated from the coordinates of the screen reference point in the two coordinate systems.
In a specific implementation, four screen reference points may be selected, assuming there are four screen reference points A, B, C, D in the first coordinate system, corresponding to screen reference points a ', B', C ', D' in the camera image.
Setting the perspective transformation parameters as a perspective transformation matrix, and setting the relationship of the screen reference points in the first coordinate system and the second coordinate system as follows:
where, (x, y) is the coordinates of the screen reference point before the second coordinate system, i.e., perspective transformation, (a, b) is the coordinates of the screen reference point after the first coordinate system, i.e., perspective transformation, k0, …, k7 are eight parameters of the perspective transformation matrix, and w is a weight value.
Converting the above relation into:
thereby obtaining:
a＝k0*x+k1*y+k2-k6*x*a-k7*y*a
b＝k3*x+k4*y+k5-k6*x*b-k7*y*b
in the above manner, the nonlinear equation can be converted into a linear equation. Assuming that coordinates of the four screen reference points before the perspective transformation are (x1, y1), (x2, y2), (x3, y3), (x4, y4), and coordinates after the perspective transformation are (a1, b1), (a2, b2), (a3, b3), (a4, b4), a matrix form may be established:
using the screen reference point coordinates (x1, y1), (x2, y2), (x3, y3), (x4, y4) obtained in the second coordinate system, and the screen reference point coordinates (a1, b1), (a2, b2), (a3, b3), (a4, b4) obtained in the second coordinate system, the parameters k0, …, k7 can be obtained by calculating the 8 x 8 matrix on the right side of the equation in the above formula, so as to obtain the perspective transformation matrix.
Step 360: and respectively acquiring first corner coordinates of the red, green and blue checkerboard patterns in the first coordinate system according to the perspective transformation parameters and the second corner coordinates.
Inverting the perspective transformation matrix to obtain a matrix equal to [ t11, t12, t 13; t21, t22, t 23; t31, t32, t33 ].
The coordinate relationship of the checkerboard corner points in the first coordinate system and the second coordinate system can be expressed as follows:
for the w parameter, the following is satisfied:
t31*w*a+t32*w*b+t33*w＝1
then there are:
the second corner coordinates may be derived from the first corner coordinates:
x＝t11*w*a+t12*w*b+t13*w
y＝t21*w*a+t22*w*b+t23*w
wherein the coordinates (a, b) are coordinates of the checkerboard corner points in a first coordinate system, namely coordinates after perspective transformation; the coordinates (x, y) are the coordinates of the corner points of the checkerboard in the second coordinate system, i.e. before the perspective transformation.
The method and the device capture the picture projected to the screen by the checkerboard card through the camera, determine the corner coordinates of the checkerboard card in the camera image, and further determine the position of the checkerboard card on the screen according to the perspective conversion matrix of the camera, and further determine the dispersion parameter.
In some embodiments of the present application, based on the foregoing solution, the method further comprises:
selecting one color from red, green and blue as a reference color;
the red, green and blue checkerboard cards are divided into the checkerboard cards of the reference color and the checkerboard cards of the non-reference color according to the reference color.
In the specific implementation, one color selected from red, green and blue can be used as a reference color, the corresponding pixel coordinate corresponds to the reference coordinate, the corresponding checkerboard card is a checkerboard card of the reference color, and a foundation is laid for the subsequent comparison of the deviation of the corner point coordinates of the checkerboard cards with different colors.
In some embodiments of the present application, based on the foregoing solution, obtaining first corner coordinates of the red, green, and blue checkerboard cards in the first coordinate system respectively includes:
acquiring a first reference color corner point coordinate of a reference color checkerboard pattern card in a first coordinate system;
acquiring first non-reference color corner point coordinates of a non-reference color checkerboard card in a first coordinate system;
determining dispersion correction parameters according to deviations between first angular point coordinates of checkerboard cards of different colors, comprising:
and determining the difference value between the first non-reference color corner point coordinate and the first reference color corner point coordinate, and taking the difference value as a dispersion correction parameter.
Suppose the coordinates of the corner points of the red, green and blue checkerboard cards on the first coordinate system are three position tables of Tr0, Tg0 and Tb0 respectively. If red is defined as the reference color, the difference between the first corner coordinates of the green checkerboard card and the red checkerboard card is:
ΔT1＝Tg0-Tr0
the difference value of the first corner point coordinates of the blue checkerboard card and the red checkerboard card is as follows:
ΔT2＝Tb0-Tr0
the corner point coordinates of the red, green and blue checkerboard cards should be the same theoretically, but have deviation, and the new corner point coordinates of the green checkerboard cards are obtained by calculation by using difference results:
Tg1＝Tr0-ΔT1，
and the new corner point coordinates of the blue checkerboard card:
Tb1＝Tr0-ΔT2。
namely, the corrected position value tables Tr0, Tg1, Tb1 of the red, green, and blue pixels are determined. The intensities corresponding to different colors are readjusted according to Tr0, Tg1 and Tb1, so that the positions of red, green and blue light corresponding to the same position in different checkerboard images on a screen are the same as much as possible, and when the dispersion parameters are applied to the image to be projected onto the screen, the coordinates of the red, green and blue pixels in the image before incidence can be adjusted, so that the red, green and blue light corresponding to the same position in the image are overlapped on the screen, and the dispersion phenomenon is avoided.
In some embodiments of the present application, based on the foregoing solution, coordinate correction is performed on three primary color pixels of an image to be projected onto a screen according to a dispersion correction parameter, including:
acquiring a reference coordinate of a reference color pixel in a first coordinate system in an image to be projected to a screen;
and determining the updated coordinates of the non-reference color pixels in the image to be projected to the screen in the first coordinate system according to the reference coordinates and the dispersion correction parameters.
The first pixel of the corrected image is formed by overlapping the first pixel of the red channel, the second pixel of the green channel and the second pixel of the blue channel. The corrected image can be obtained by superposing the three shifted channels of pixels, namely, the RGB of each pixel of the corrected image is changed.
From the analysis of coordinate angles, coordinate positions before the tricolor light is incident are different, so that the positions after refraction are superposed as much as possible, and from the analysis of angles, the DMD controls which lenses in the micro lens array are inclined and opened for a long time according to the RGB value of the corrected image, so that the intensity of red light, green light and blue light projected to a certain pixel point is changed, and the dispersion phenomenon is reduced or avoided as much as possible.
In some embodiments of the present application, based on the foregoing scheme, generating the red, green and blue checkerboard cards matched with the screen respectively includes:
acquiring the resolution of a screen;
and respectively generating red, green and blue checkerboard cards with the resolution being the same as that of the screen.
In the specific implementation, the resolution of the red, green and blue checkerboard cards is the same as that of the screen, and the number of color blocks in the checkerboard cards is the same as that of control points of the optical components of the laser television. When the optical component corrects the coordinates of the red, green and blue pixels, the control points drive the coordinates of the pixel points of the surrounding area to move, the more the number of the control points is, the more the number of the corner points of the checkerboard color blocks is, the more the data quantity of the dispersion correction parameters is, the more accurate the correction of the coordinates of the red, green and blue pixels is, and the better the correction effect is.
In some embodiments of the present application, based on the foregoing solution, the acquiring a second reference coordinate of the screen reference point in a second coordinate system by taking the screen reference point as a vertex of the screen includes:
carrying out edge detection on the camera image, and identifying the vertex of the screen;
second reference coordinates of the vertices of the screen in a second coordinate system are determined.
In a specific implementation, four vertices of the screen may be selected as screen reference points, and if the position of the center of the screen is set as the origin (0,0) of the first coordinate system, and the X-axis is set horizontally to the right, and the Y-axis is set vertically downward to establish the first coordinate system when the first coordinate system is constructed based on the screen, the coordinates of the four vertices of the screen are (-screen width/2, -screen height/2), (-screen width/2, screen height/2), (screen width/2, -screen height/2), (screen width/2, screen height/2).
In the second coordinate system, the vertex of the screen can be identified through edge detection, and then the coordinates of the vertex in the second coordinate system are determined.
Fig. 5 is a schematic flowchart of a laser projection method applied to a laser television according to an embodiment of the present disclosure, and as shown in fig. 5, the method at least includes the following steps.
Step 510: the image to be projected on the screen and the RGB information of the image are acquired.
The RGB information of the image reflects the value of each pixel point in a red channel, a green channel and a blue channel of the image.
Step 520: and acquiring the RGB information of the corrected image according to the RGB information and the dispersion correction parameters of the image.
And shifting the pixels of the non-reference color channel according to the dispersion parameter, for example, shifting the first pixels in the original green channel and the original blue channel to the second pixel position, so that the first pixels of the corrected image are formed by overlapping the first pixels of the original red channel, the second pixels of the original green channel and the second pixels of the original blue channel. The corrected image can be obtained by superposing the three shifted channels of pixels, namely, the RGB of each pixel of the corrected image is changed.
Step 530: and controlling the micro lens in the DMD to work according to the RGB information of the corrected image.
The light source assembly generates red, green and blue tricolor light, and the tricolor light is irradiated on the DMD according to a certain sequence through the color wheel. When red light is incident on the DMD, the tilting of the respective position of the micromirror array to "on" is controlled according to the position and intensity that the red pixels of the image should show (i.e., according to the value of each pixel in the red channel corresponding to the image), as do the green and blue lights.
Embodiments of the dispersion correction apparatus of the present application are described below, which can be used to perform the dispersion correction methods in the above-described embodiments of the present application. For details that are not disclosed in the embodiments of the dispersion correction device of the present application, please refer to the embodiments of the dispersion correction method described above in the present application.
Fig. 6 is a schematic structural diagram of a dispersion correction device according to an embodiment of the present application, and as shown in fig. 6, the dispersion correction device 600 at least includes the following components.
A card obtaining unit 610, configured to generate red, green, and blue checkerboard cards respectively matched with the screen, and project the red, green, and blue checkerboard cards to the screen through an optical component of the laser television respectively;
a first coordinate obtaining unit 620, configured to construct a first coordinate system based on a screen, and obtain first corner coordinates of the checkerboard patterns of red, green, and blue in the first coordinate system, respectively;
a correction parameter obtaining unit 630, configured to determine a dispersion correction parameter according to a deviation between first angle coordinates of checkerboard cards with different colors;
and the correcting unit 640 is configured to perform coordinate correction on the three primary color pixels of the image to be projected onto the screen according to the dispersion correction parameter.
The embodiment of the present application further provides a laser television, and the laser television includes:
a screen;
and the optical component comprises a DLP and a DMD.
The DLP is used for acquiring an image to be projected to a screen and RGB information of the image, and is also used for acquiring the RGB information of the corrected image according to the RGB information and dispersion correction parameters of the image.
And the DMD is used for controlling the micro lens in the DMD to work according to the RGB information of the corrected image.
Embodiments of the present application also provide a storage medium, which includes a program or instructions, and when the program or instructions are executed, the storage medium is configured to execute a dispersion correction method and any optional method provided in embodiments of the present application.
Finally, it should be noted that: as will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A dispersion correction method, applied to a laser television set including a screen, the method comprising:
respectively generating red, green and blue checkerboard graphic cards matched with the screen, and respectively projecting the red, green and blue checkerboard graphic cards to the screen through an optical component of the laser television;
constructing a first coordinate system based on the screen, and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system;
determining dispersion correction parameters according to the deviation between the first angle point coordinates of the checkerboard cards with different colors;
and according to the dispersion correction parameters, carrying out coordinate correction on the three-primary-color pixels of the image to be projected to the screen.
2. The dispersion correction method of claim 1, wherein said separately obtaining first angular coordinates of said red, green and blue checkerboard cards in said first coordinate system comprises:
respectively projecting the red, green and blue checkerboard pattern cards to the screen through an optical component of the laser television to obtain respective screen projection pictures of the red, green and blue checkerboard pattern cards;
capturing, by a video camera, a camera image containing the screen projection;
constructing a second coordinate system based on the camera image, and respectively acquiring second corner point coordinates of the red, green and blue checkerboard graphs in the second coordinate system;
acquiring a first reference coordinate of a preset screen reference point in the first coordinate system, and acquiring a second reference coordinate of the screen reference point in the second coordinate system;
acquiring perspective transformation parameters of the camera according to a second reference coordinate of the screen reference point in the second coordinate system and a first reference coordinate of the screen reference point in the first coordinate system;
and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system according to the perspective transformation parameters and the second corner coordinates.
3. The dispersion correction method of claim 2, wherein the method further comprises:
selecting one color from red, green and blue as a reference color;
and dividing the red, green and blue checkerboard cards into reference color checkerboard cards and non-reference color checkerboard cards according to the reference colors.
4. The dispersion correction method of claim 3, wherein said separately obtaining first angular coordinates of said red, green and blue checkerboard cards in said first coordinate system comprises:
acquiring a first reference color corner point coordinate of the reference color checkerboard pattern card in the first coordinate system;
acquiring first non-reference color corner point coordinates of the non-reference color checkerboard card in the first coordinate system;
determining dispersion correction parameters according to deviations between the first angular point coordinates of the checkerboard cards of different colors, including:
and determining the difference value between the coordinates of the first non-reference color corner point and the coordinates of the first reference color corner point, and taking the difference value as the dispersion correction parameter.
5. The dispersion correction method according to claim 3, wherein said coordinate correcting, according to the dispersion correction parameter, three primary color pixels of an image to be projected onto the screen comprises:
acquiring a reference coordinate of a reference color pixel in the image to be projected to the screen in the first coordinate system;
and determining the updated coordinates of the non-reference chromatic pixels in the image to be projected to the screen in the first coordinate system according to the reference coordinates and the dispersion correction parameters.
6. The dispersion correction method of claim 1, wherein said separately generating a checkerboard card of red, green, and blue that matches said screen comprises:
acquiring the resolution of the screen;
and respectively generating the red, green and blue checkerboard cards with the same resolution as that of the screen.
7. The dispersion correction method according to claim 2, wherein the screen reference point is a vertex of the screen, and the acquiring of the second reference coordinate of the screen reference point in the second coordinate system includes:
performing edge detection on the camera image, and identifying the vertex of the screen;
determining second reference coordinates of vertices of the screen in the second coordinate system.
8. A dispersion correction apparatus, for use in a laser television set, the laser television set including a screen, the apparatus comprising:
the picture card acquisition unit is used for respectively generating red, green and blue checkerboard picture cards matched with the screen and respectively projecting the red, green and blue checkerboard picture cards to the screen through an optical component of the laser television;
the first coordinate acquisition unit is used for constructing a first coordinate system based on the screen and respectively acquiring first corner coordinates of the red, green and blue checkerboard cards in the first coordinate system;
a correction parameter obtaining unit, configured to determine a dispersion correction parameter according to a deviation between the first angle coordinates of the checkerboard cards of different colors;
and the correction unit is used for carrying out coordinate correction on the three-primary-color pixels of the image to be projected to the screen according to the dispersion correction parameters.
9. A laser television, the laser television comprising:
a screen;
an optical assembly for projecting an image onto the screen; and
the dispersion correcting device of claim 8.
10. A computer-readable storage medium comprising a program or instructions which, when executed, performs the dispersion correction method of any one of claims 1 to 7.
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| PCT/CN2022/122692 WO2023071698A1 (en) | 2021-10-29 | 2022-09-29 | Laser projection device, and dispersion correction method for projected image |
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