CN114842779A - Laser projection image display method, apparatus and computer storage medium - Google Patents
Laser projection image display method, apparatus and computer storage medium Download PDFInfo
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- CN114842779A CN114842779A CN202210589268.8A CN202210589268A CN114842779A CN 114842779 A CN114842779 A CN 114842779A CN 202210589268 A CN202210589268 A CN 202210589268A CN 114842779 A CN114842779 A CN 114842779A
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/001—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes using specific devices not provided for in groups G09G3/02 - G09G3/36, e.g. using an intermediate record carrier such as a film slide; Projection systems; Display of non-alphanumerical information, solely or in combination with alphanumerical information, e.g. digital display on projected diapositive as background
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0242—Compensation of deficiencies in the appearance of colours
Abstract
The application discloses a laser projection image display method, laser projection image display equipment and a computer storage medium, and belongs to the technical field of projection. The method comprises the steps of obtaining a first distance between a target point in a screen and a projection lens, obtaining a primary color offset corresponding to the first distance from a dispersion corresponding relation to obtain a target offset, and correcting first primary color light at the target point according to the target offset. Therefore, the projection equipment can project the display image to the screen according to the position of the corrected first primary color light so as to display the adjusted image, and the coincidence degree of the first primary color light and the fixed primary color light projected to the screen can be improved so as to improve the dispersion problem.
Description
Technical Field
The present application relates to the field of projection technologies, and in particular, to a method and an apparatus for displaying a laser projection image, and a computer storage medium.
Background
The laser light source is used as the light source of the projection equipment, and has the characteristics of high brightness, bright color, low energy consumption and long service life, so that the projection equipment has high picture contrast. The projection apparatus may include a light source assembly, a light modulation assembly, and a projection lens.
At present, in the process of projection of a projection device, a light source assembly emits primary light with different colors according to a time sequence, the primary light is modulated by a light modulation assembly and then enters a projection lens, and the projection lens can guide the received primary light to a screen of a projection television, wherein the projection device comprises a plurality of optical lenses.
However, the refractive indexes of the primary lights with different colors in the optical lenses are different, and the primary lights with different colors emitted from the light source assembly have a dispersion problem after passing through the optical lenses, which results in poor definition of the displayed image of the projection apparatus.
Disclosure of Invention
The embodiment of the application provides a laser projection image display method, laser projection image display equipment and a computer storage medium. The technical scheme is as follows:
according to an aspect of the present application, there is provided a laser projection image display method, the method including:
acquiring a dispersion corresponding relation, wherein the dispersion corresponding relation comprises a corresponding relation between a reference distance and a primary color offset, the reference distance is used for representing the distance between one point in a screen and a projection lens, the screen is used for displaying a display image projected by the projection lens, and the primary color offset is the offset of first primary color light projected to the one point in the screen relative to fixed primary color light;
acquiring a first distance between a target point in the screen and the projection lens, wherein the target point is one point in the screen;
obtaining the primary color offset corresponding to the first distance from the dispersion corresponding relation to obtain a target offset;
correcting the first primary color light at the target point based on the target offset amount;
acquiring an optical modulation signal according to the position of the fixed primary color light and the position of the corrected first primary color light;
and displaying an image based on the light modulation signal.
Optionally, the acquiring a first distance between the target point in the screen and the projection lens includes:
acquiring a second distance between the target point and a first point, wherein the first point is the position of the orthographic projection of the projection lens on the plane where the screen is located;
acquiring a third distance between the projection lens and the screen;
determining the first distance based on a first formula, the first formula being:
wherein X is the first distance, Y is the second distance, and Z is the third distance.
Optionally, the obtaining the dispersion correspondence includes:
acquiring a plurality of primary color offsets of the first primary color light relative to the fixed primary color light at a plurality of reference points on the screen, wherein the distances between at least two reference points in the plurality of reference points and the projection lens are different;
acquiring a fourth distance between each reference point and the projection lens;
normalizing the plurality of fourth distances to obtain a plurality of reference distances;
determining a plurality of reference distance ranges based on the plurality of reference distances, the reference distance ranges including a plurality of reference distances;
determining the dispersion correspondence in which the plurality of reference distance ranges and the plurality of base color offsets correspond one to one, based on the plurality of reference distance ranges and the plurality of base color offsets.
Optionally, the obtaining the primary color offset corresponding to the first distance from the dispersion correspondence to obtain a target offset includes:
determining a ratio between the first distance and a maximum distance, the maximum distance being a maximum distance between the projection lens and a point in the screen;
determining a reference distance range corresponding to the ratio from the plurality of reference distance ranges to obtain a target reference range;
and determining the primary color offset corresponding to the target reference range from the dispersion corresponding relation to obtain a target offset.
Optionally, the correcting the first primary color light at the target point based on the target offset amount includes:
determining a transverse offset of the first primary color light at the target point based on a second formula, wherein the second formula is that V is U × sin α, where U is the target offset, V is the transverse offset, and α is an included angle between a first line segment and a second line segment, the first line segment is a projection of an optical axis of the projection lens on a plane where the screen is located, the second line segment is a line segment between the first point and the target point, and the first point is a position where an orthogonal projection of the projection lens on the plane where the screen is located;
determining a longitudinal offset amount of the first primary color light at the target point based on a third formula, where W is the longitudinal offset amount;
and determining the adjusted position of the first primary color light at the target point based on the transverse offset and the longitudinal offset and the position of the target point in the screen so as to correct the first primary color light at the target point.
Optionally, the screen comprises a plurality of regions;
the acquiring a first distance between a target point in a screen and a projection lens includes:
acquiring a first distance between a target point in each region and the projection lens;
the correcting the first primary color light at the target point comprises:
and for each region, taking the target offset of the target point in the region as the target offset of the region to correct the first primary color light at the region.
According to another aspect of the present application, there is provided a laser projection apparatus including:
a controller, a laser light source and a light valve;
the controller is used for acquiring a dispersion corresponding relation, wherein the dispersion corresponding relation comprises a corresponding relation between a reference distance and a primary color offset, the reference distance is used for representing the distance between one point in a screen and a projection lens, the screen is used for displaying a display image projected by the projection lens, and the primary color offset is the offset of first primary color light projected to one point in the screen relative to fixed primary color light;
the controller is further configured to obtain a first distance between a target point in the screen and the projection lens, where the target point is one point in the screen;
the controller is further configured to obtain a primary color offset corresponding to the first distance from the dispersion corresponding relationship to obtain a target offset;
the controller is further configured to correct the first primary color light at the target point based on the target offset amount;
the controller is further used for acquiring an optical modulation signal according to the position of the fixed primary color light and the position of the corrected first primary color light;
the laser light source is used for providing a laser beam to the light valve under the control of the controller;
and the light valve is used for displaying images based on the light modulation signal under the control of the controller.
Optionally, the laser light source comprises a blue laser emitter, a green laser emitter and a red laser emitter.
According to another aspect of the present application, there is provided a laser projection apparatus comprising a processor and a memory, the memory having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by the processor to implement the laser projection image display method described above.
According to another aspect of the present application, there is provided a computer storage medium having stored therein at least one instruction, at least one program, set of codes, or set of instructions that is loaded and executed by a processor to implement a laser projection image display method as described above.
According to another aspect of the application, a computer program product or computer program is provided, comprising computer instructions stored in a computer readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the laser projection image display method.
The beneficial effects brought by the technical scheme provided by the embodiment of the application at least comprise:
the method comprises the steps of obtaining a first distance between a target point in a screen and a projection lens, obtaining a primary color offset corresponding to the first distance from a dispersion corresponding relation to obtain a target offset, and correcting first primary color light at the target point according to the target offset. Therefore, the projection equipment can project the display image to the screen according to the position of the corrected first primary color light so as to display the adjusted image, and the coincidence degree of the first primary color light and the fixed primary color light projected to the screen can be improved so as to improve the dispersion problem. The problem that the definition of the display image of the projection equipment is poor in the related technology can be solved, and the effect of improving the definition of the display image of the projection equipment is achieved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic diagram of a dispersion principle;
FIG. 2 is a diagram illustrating a distribution of chromatic aberration on a screen;
FIG. 3 is a schematic diagram of an implementation environment of a laser projection image display method provided by an embodiment of the present application;
fig. 4 is a flowchart of an image rectification method according to an embodiment of the present application;
FIG. 5 is a flow chart of another method for displaying a laser projection image according to an embodiment of the present disclosure;
fig. 6 is a flowchart for obtaining a chromatic dispersion mapping relationship according to an embodiment of the present application;
FIG. 7 is a schematic diagram of a reference point provided by an embodiment of the present application;
fig. 8 is a schematic diagram of a chromatic dispersion mapping relationship provided in an embodiment of the present application;
FIG. 9 is a schematic diagram of coordinates on a screen provided by an embodiment of the present application;
FIG. 10 is a schematic diagram of the coordinates shown in FIG. 9 looking into the screen in a first direction;
FIG. 11 is a flow chart of a first primary color light correction provided by an embodiment of the present application;
FIG. 12 is a schematic view of a first primary color light correction provided by an embodiment of the present application;
FIG. 13 is a schematic diagram of a primary light shift provided by an embodiment of the present application;
fig. 14 is a block diagram of a laser projection apparatus according to an embodiment of the present disclosure;
fig. 15 is a block diagram of a laser projection apparatus according to an embodiment of the present disclosure;
fig. 16 is a block diagram of another laser projection apparatus according to an embodiment of the present disclosure.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
In laser projection display, Digital Light Processing (DLP) technology is widely used, and Digital Light Processing refers to that image signals can be digitally processed first, and then display images corresponding to the processed image signals are projected through a projection lens. The projection apparatus may include a light source assembly, a light modulation assembly, and a projection lens. In the projection process of the projection equipment, the light source component emits primary color light with different colors according to time sequence, the primary color light is modulated by the light modulation component and then enters the projection lens, and the projection lens can guide the received primary color light to a screen of a projection television.
As shown in fig. 1, fig. 1 is a schematic diagram of a dispersion principle. The projection lens is used for imaging the light beam emitted by the light modulation component, and the light beam can comprise three colors of primary light. Since the projection lens comprises a plurality of lenses and the refractive indexes of the three primary colors in the lenses are different, the three primary colors incident to the same position of the lenses have deviation in the imaging positions after passing through the lenses. Illustratively, as shown in fig. 1, the light beam S1 emitted by the light source assembly includes three primary colors, the light beam S1 enters the lens 101, and the three primary colors (R, G and B) emitted after passing through the lens 101 have a dispersion problem, so that the transmission directions and the projection positions of the three primary colors (R, G and B) on the screen 12 are different, which causes a color deviation problem of the display image projected onto the screen by the projection lens.
As shown in fig. 2, fig. 2 is a schematic diagram of a color difference distribution on a screen. The primary colors (R, G and B) of the three colors are respectively red primary color R, blue primary color G and green primary color B. The display image projected onto the screen 12 by the projection apparatus may be formed by superimposing a red image formed of the red primary color light R, a blue image formed of the blue primary color light G, and a green image formed of the green primary color light B to display a color image on the screen 12. Due to the dispersion problem caused by the projection lens, the red, green and blue images projected onto the screen 12 cannot be completely overlapped, resulting in poor definition of the display image of the projection apparatus. Illustratively, each pixel location in the display image projected onto the screen 12 corresponds to an image, which may include images of three primary colors. That is, one pixel position may correspond to a red image formed by one red primary color light R, a blue image formed by one blue primary color light G, and a green image formed by one green primary color light B, and the images of the three primary color lights can form one color dot after being superimposed at the same pixel position.
However, since the three colors of primary color light emitted after passing through the lens have a dispersion problem, the three colors of primary color light emitted from the light modulation element to the same position of the projection lens may generate color shift after passing through the projection lens, resulting in a deviation in position between the primary color lights of different colors at the position of one pixel to be projected.
Fig. 3 is a schematic diagram of a projection system provided in an embodiment of the present application, which may include a projection device 11, a screen 12, and a controller 13.
The projection apparatus 11 may include a light source assembly 111, a light valve 112, and a projection lens 113. The light source assembly 111 may include a laser emitter, and may emit laser lights of different colors as primary light in time series. The primary light can be transmitted to the light valve 112, the light valve 112 can be a Digital Micromirror Device (abbreviated as DMD), and the DMD can be regarded as an optical switch formed by a plurality of micromirrors, that is, the micromirrors are rotated to open and close the optical switch. The number of the lenses is determined by the display resolution, and one small lens corresponds to one pixel. Each micro-mirror has a separate support frame and deflects by positive or negative n degrees (n > 0) about the hinge tilt axis.
The micromirrors operate by reflecting light. When the micro-mirror is in an On State (i.e., the micro-mirror deflects by + n degrees), the incident angle of the incident light (light source) reaches n degrees, and the reflection angle also reaches n degrees (the sum of the incident angle and the reflection angle is 2n degrees), at this time, the energy of the light which can be received by the lens is the largest. If the micro-mirror is deflected to the Off State (i.e., the micro-mirror deflects by-n degrees), the energy of the light received by the lens is minimum, and the brightness is minimum.
The projection lens 113 is capable of receiving the light beam emitted from the light valve 112 and projecting the received light beam to the screen 12 to form a display image on the screen 12, so that a viewer can see a display screen by looking at the projection screen.
The controller 13 may be located in the projection device and the controller 13 may be electrically connected to the light valve 112 to provide the driving signals to the light valve 112. The controller 13 may control the flip angle and duration of the micromirrors in the light valve 112 through the driving signals. The controller 13 may include a processor.
Fig. 4 is a flowchart of an image rectification method according to an embodiment of the present application. The method may be applied in a controller of a projection system implementing the environment shown in fig. 3. The method may include the following steps:
The dispersion corresponding relation comprises a corresponding relation between a reference distance and a primary color offset, the reference distance is used for representing the distance between one point in a screen and a projection lens, the screen is used for displaying a display image projected by the projection lens, and the primary color offset is the offset of first primary color light projected to one point in the screen relative to fixed primary color light.
Wherein, the target point is a point in the screen.
And 204, correcting the first primary color light at the target point based on the target offset.
And step 205, acquiring a light modulation signal according to the position of the fixed primary light and the position of the corrected first primary light.
And step 206, displaying an image based on the light modulation signal.
And correcting the first primary color light at the target point, namely adjusting the projection position of the first primary color light at the target point in the screen, so that the coincidence ratio of the first primary color light and the fixed primary color light is higher.
To sum up, the embodiment of the present application provides a method for displaying a laser projection image, which includes obtaining a first distance between a target point in a screen and a projection lens, obtaining a primary color offset corresponding to the first distance from a dispersion correspondence, so as to obtain a target offset, and correcting a first primary color light at the target point according to the target offset. Therefore, the projection equipment can project the display image to the screen according to the position of the corrected first primary color light so as to display the adjusted image, and the coincidence degree of the first primary color light and the fixed primary color light projected to the screen can be improved so as to improve the dispersion problem. The problem that the definition of the display image of the projection equipment in the related technology is poor can be solved, and the effect of improving the definition of the display image of the projection equipment is achieved.
Fig. 5 is a flowchart of another laser projection image display method according to an embodiment of the present disclosure. The method may be applied in a controller of a projection system implementing the environment shown in fig. 3. The method may include the following steps:
and 301, acquiring a dispersion corresponding relation.
The dispersion correspondence may include a correspondence between a reference distance and a primary color offset, the reference distance may be used to represent a distance between a point in the screen and the projection lens, the screen may be used to display a display image projected by the projection lens, and the primary color offset is an offset of the first primary color light projected to the point in the screen with respect to the fixed primary color light.
The first primary color light and the fixed primary color light may be two primary color lights different in color from among the plurality of primary color lights emitted by the light source assembly. In the embodiment of the present application, the fixed primary color light may include a green primary color light G, and the first primary color light may include a red primary color light R and a blue primary color light B. That is, in the display image projected onto the screen, the position where the green primary color light G is projected onto the screen is set as a fixed position, and the positions where the red primary color light R and the blue primary color light B are projected onto the screen are deviated from the fixed positions. The degree of this deviation can be measured in terms of the primary color shift, which is illustratively 0.3 pixels for red primary color light R projected to a certain point on the screen relative to green primary color light G.
As shown in fig. 6, step 301 may include the following five substeps:
sub-step 3011, obtain a plurality of primary color offsets of the first primary color light relative to the fixed primary color light at a plurality of reference points on the screen.
Wherein the distances between at least two reference points of the plurality of reference points and the projection lens are different. Since the degree of deflection of the light beams emitted from the projection lens to the two reference points in the lens is different when the distance between the two reference points on the screen and the projection lens is different, the amounts of primary color shift in the display images projected to the two reference points on the screen are different. When the distance between the two reference points on the screen and the projection lens is the same, the degree of deflection of the light beams emitted by the projection lens to the two reference points in the lens is also the same, and therefore the amounts of primary color shift in the display images projected to different positions on the screen can also be the same.
As shown in fig. 7, fig. 7 is a schematic diagram of a reference point provided in the embodiment of the present application. The plurality of reference points may include a first reference point c1, a second reference point c2, a third reference point c3, a fourth reference point c4, and a fifth reference point c 5. Here, the distances between the third reference point c3 and the fourth reference point c4 and the projection lens 113 are the same, and therefore, the amounts of offset of the first primary color light (red primary color light R and blue primary color light B) with respect to the fixed primary color light (green primary color light G) at the third reference point c3 and the fourth reference point c4 are the same. The first reference point c1, the second reference point c2, and the third reference point c3 are arranged in a direction away from the projection lens 113, and the first reference point c1, the second reference point c2, and the third reference point c3 are different from the projection lens 113, whereby the amounts of shift of the first primary color light (red primary color light R and blue primary color light B) with respect to the fixed primary color light (green primary color light G) at the first reference point c1, the second reference point c2, and the third reference point c3 are also different from each other. The amounts of shift of the first primary color light (red primary color light R and blue primary color light B) and the fixed primary color light (green primary color light G) at the plurality of reference points may be acquired by measurement.
It should be noted that the plurality of reference points in the embodiment of the present application are not limited to the first reference point c1, the second reference point c2, the third reference point c3, the fourth reference point c4, and the fifth reference point c5, and the plurality of reference points may further include a sixth reference point, a seventh reference point, and other reference points.
Sub-step 3012, obtain a fourth distance between each reference point and the projection lens.
The fourth distance between the reference point and the projection lens may refer to a distance between the reference point on the screen 12 and the light exit of the projection lens 113.
The normalization processing is a processing mode of simplifying calculation, that is, a dimentional expression is transformed into a dimensionless expression to become a scalar. The reference distance may be a ratio of the fourth distance to a maximum distance between the projection lens 112 and the screen 12. Illustratively, for the plurality of fourth distances, the distance between the fifth reference point c5 and the projection lens 113 is the maximum distance between the projection lens 112 and the screen 12, which may be 5 meters, the distance between the fourth reference point c4 and the projection lens 113 is 4 meters, the normalized reference distance of the fourth reference point c4 is 4/5 ═ 0.8, and the plurality of normalized reference distances range between [0, 1 ].
Sub-step 3014, determining a plurality of reference distance ranges based on the plurality of reference distances, the reference distance ranges comprising the plurality of reference distances.
The adjacent or more similar reference distances among the plurality of reference distances correspond to the more similar values of the primary color offsets, and therefore, the plurality of reference distances having the more similar values of the last time may be set as a reference distance range, and for example, the reference distance range may include reference distances between 0.5 and 0.15.
In the dispersion correspondence, a plurality of reference distance ranges and a plurality of primary color offsets are in one-to-one correspondence.
As shown in fig. 8, fig. 8 is a schematic diagram of a dispersion correspondence relationship provided in the embodiment of the present application. In the dispersion mapping diagram, different reference distance ranges may correspond to different primary color offsets. For example, the fixed primary color light may include a green primary color light, and the first primary color light may include a red primary color light and a blue primary color light, as can be seen from fig. 8, the deviation degree of the red primary color light with respect to the green primary color light shows a trend of gradually increasing first and then gradually decreasing as the reference distance increases, and the primary color deviation amount of the red primary color light with respect to the green primary color light may reach 0.5 pixel at maximum; the deviation degree of the blue primary color light relative to the green primary color light shows a gradually increasing trend along with the increase of the reference distance, and the primary color deviation amount of the blue primary color light relative to the green primary color light can reach 0.5 pixel at most.
The one-to-one correspondence relationship between the multiple reference distance ranges and the multiple base color offsets shown in fig. 8 may be shown in table 1 below, where the division of the reference range may be an equal division between [0, 1], and may also be flexibly divided according to the variation degree of the base color offsets corresponding to the actual reference distance ranges, and the division of the reference range is not limited in the embodiment of the present application. Illustratively, when the reference distance at a certain point on the screen is between 0.55 and 0.65, the offset of the red primary color light projected to the certain point relative to the green primary color light is 0.4 pixels, and the offset of the blue primary color light projected to the certain point relative to the green primary color light is 0.2 pixels.
TABLE 1
And 302, acquiring a second distance between the target point and the first point.
The first point d1 is the position of the projection lens 113 on the plane of the screen 12. The screen 12 includes a plurality of areas and the target point d3 may be a point in the screen 12.
Since the display resolution of the laser display device is generally high, each pixel position corresponds to one image, and therefore, if the image at each pixel position is adjusted, the calculation amount is large. Therefore, the screen is divided into a plurality of areas, and the images at a plurality of points in the same area are subjected to adjustment of the same trend. This can reduce the amount of calculation.
Illustratively, as shown in fig. 9, fig. 9 is a schematic diagram of coordinates on a screen provided in an embodiment of the present application. The size of the screen 12 may be 100 inches and the screen 12 may be divided into 32 x 62 zones. The resolution of the laser display device may be 3840 × 2160, with the upper left corner of the screen 12 as the origin (0, 0), the coordinates of the end point of the lower right corner of the screen 12 as (3840, 2160), the lateral direction as the x-axis, and the longitudinal direction as the y-axis. The width of each region may be set in steps of 62.5 pixels and the height may be set in steps of 69.5 pixels to evenly distribute the regions in the screen 12.
A coordinate of an intersection point d2 of the optical axis s1 of the projection lens 113 and the screen 12 may be (1920, 1080), where, as shown in fig. 9 and 10, fig. 10 is a coordinate diagram of the coordinate diagram shown in fig. 9, which is viewed along a first direction f1 toward the screen, where the first direction f1 is a direction parallel to the upper and lower edges of the screen 12, L1 is a distance between a first point d1 and the lower edge of the screen 12, the first point d1 is a position where the projection lens 113 projects on a plane where the screen 12 is located, the first point d1 may be equal to an abscissa of the intersection point d2, a distance L2 between the first point d1 and the intersection point d2(1920, 1080) may be 1080+ L1, and a coordinate of the first point d1 may be (1920, 2160+ L1).
Assuming that the coordinates of the target point d3 are (x1, y1), the difference L2 between the abscissa of the target point d3 and the first point d1 is 1920-x1, and the difference L3 between the ordinate of the target point d3 and the first point d1 is 2160+ L1-y 1.
The second distance Y between the acquisition target point d3 and the first point d1 may satisfy the followingThe formula: y is 2 ＝(1920-x1) 2 +(2160+L1-y1) 2 . L1 may be obtained from the measurements, whereby a second distance Y between the target point d3 and the first point d1 may be obtained from the coordinates of the target point d 3.
And step 303, acquiring a third distance between the projection lens and the screen.
As shown in fig. 10, the third distance Z may be a distance between the projection lens 113 and the screen 12 in a direction perpendicular to a plane in which the screen 12 is located, and may be obtained by measurement.
As shown in fig. 9, after the second distance Y and the third distance Z are obtained, the first distance X may be determined according to a first formula:
optionally, the above steps 302 to 304 may be repeated to obtain the first distance between one target point in each region and the projection lens. The target point in each region may be a center point in the region.
Wherein the maximum distance is the maximum distance between the projection lens and a point in the screen. The normalized value of the first distance may be obtained by calculating a ratio between the first distance and the maximum distance. So that the normalized value of the first distance can correspond to the reference distance.
After obtaining the normalized value of the first distance of the target point, referring to fig. 8 and table 1, it can be determined to which reference distance range the ratio belongs, so as to obtain the target reference range corresponding to the target point.
And 307, determining the primary color offset corresponding to the target reference range from the dispersion corresponding relation to obtain the target offset.
With further reference to fig. 8 and table 1, the primary color offset corresponding to the first distance is obtained from the dispersion correspondence to obtain the target offset. Illustratively, the ratio between the first distance and the maximum distance is 0.5, and the corresponding target reference range is 0.55 to 0.65, the shift amount of the red primary color light projected to the target point relative to the green primary color light is 0.4 pixels, and the shift amount of the blue primary color light projected to the target point relative to the green primary color light is 0.2 pixels.
And 308, correcting the first primary color light at the target point based on the target offset.
On the basis of establishing the coordinate system, the transverse offset amount and the longitudinal offset amount of the first primary color light relative to the fixed primary color light can be respectively determined based on the target offset amount. After the transverse offset amount and the longitudinal offset amount are determined, the position of the first primary color light can be reversely adjusted along the directions of the abscissa and the ordinate respectively, so that the adjusted primary color light with different colors has higher overlap ratio.
As shown in fig. 11, step 308 may include the following three substeps:
and a substep 3081, determining a transverse offset of the first primary light at the target point based on a second formula, wherein the second formula is that V is U × sin α, where U is the target offset, V is the transverse offset, and α is an included angle between a first line segment and a second line segment, the first line segment is an orthographic projection of the optical axis of the projection lens on the plane where the screen is located, and the second line segment is a line segment between the first point and the target point.
As shown in fig. 7, as the included angle α between the first and second segments t1 and t2 changes, the shift direction of the first primary color light with respect to the fixed primary color light at different target points is different. As the included angle α between the first segment t1 and the second segment t2 becomes larger, the amount of lateral shift of the first primary color light with respect to the fixed primary color light becomes larger and the amount of longitudinal shift becomes smaller as the distances from the plurality of target points to the first point are the same.
Illustratively, the offset amount of the first base light with respect to the fixed base light at the third reference point c3 and the fourth reference point c4 is the same, the offset direction of the first base light with respect to the fixed base light at the third reference point c3 and the fourth reference point c4 is different, the lateral offset amount of the first base light with respect to the fixed base light at the third reference point c3 is 0(V × U sin0 ° -0), and the lateral offset amount of the first base light with respect to the fixed base light at the fourth reference point c4 is about 0.7U (V × U sin45 ° -0.7U). The third reference point c3 and the fourth reference point c4 may be two target points among the plurality of target points.
Sub-step 3082, determining a longitudinal shift amount of the first primary color light at the target point based on a third formula, where W is the longitudinal shift amount.
Likewise, the longitudinal shift amount of the first primary color light at the target point may be determined according to the relationship between the angle α between the first and second segments t1 and t2 and the target shift amount. Illustratively, the longitudinal shift amount of the first primary color light at the third reference point c3 with respect to the fixed primary color light is U (V ═ U × cos0 °), and the longitudinal shift amount of the first primary color light at the fourth reference point c4 with respect to the fixed primary color light is about 0.7U (V ═ U × cos45 °). The lateral shift amount and the longitudinal shift amount of the first primary color light with respect to the fixed primary color light at the fourth reference point c4 are equal.
Sub-step 3083, determining the adjusted position of the first primary color light at the target point based on the lateral offset and the longitudinal offset, and the position of the target point in the screen, so as to correct the first primary color light at the target point.
Alternatively, the target offset amount of the target point in the region may be set as the target offset amount of the region for each region in the screen to correct the first primary color light at the region.
As shown in fig. 12, fig. 12 is a schematic view of a first primary color light correction provided in an embodiment of the present application. The coordinates of the green primary light at the target point may be (G x1, G y1), and it is understood that the coordinates of the green primary light, the blue primary light, and the red primary light projected to the target point preset in the projection apparatus are the same coordinates, that is, the original coordinates of the green primary light, the blue primary light, and the red primary light at the target point are all (G x1, G y1), but due to the influence of the dispersion problem, a certain deviation occurs between the coordinates of the blue primary light and the red primary light actually projected to the target point through the projection lens and the original coordinates, and therefore, the coordinates of the blue primary light and the red primary light need to be reset so that the coordinates of the blue primary light and the red primary light actually projected to the target point through the projection lens are the same as the coordinates of the green primary light. To ameliorate the effects of dispersion problems.
The blue primary color light is shifted in the x-axis backward by V1 and in the y-axis forward by W1 relative to the green primary color light. The blue primary light and the green primary light at the target point can be made to coincide by shifting the blue primary light forward along the x-axis by V1 and backward along the y-axis by W1.
That is, the corrected coordinates of the blue primary light set in the controller may be (G x1+ V1, Gy1-W1) so that the blue primary light and the red primary light actually projected to the target point through the projection lens coincide with the green primary light.
Similarly, the red primary color light is shifted in the x-axis backward by V2 and in the y-axis forward by W2 relative to the green primary color light. The red primary light and the green primary light at the target point can be made to coincide by shifting the red primary light forward along the x-axis by V2 and backward along the y-axis by W2.
That is, the corrected coordinates of the red primary light set in the controller may be (G x1+ V2, Gy1-W2) so that the red primary light and the red primary light actually projected to the target point through the projection lens coincide with the green primary light.
It should be noted that, in the embodiment of the present application, W and V include both the magnitude of the offset and the offset direction, so W and V are distinguished by signs. For example, as shown in fig. 7, if the target point is located at the right side of the first segment t1 (orthogonal projection of the optical axis of the projection lens on the plane of the screen), and the blue primary color light is shifted in the reverse direction along the x-axis by V1 with respect to the green primary color light, the blue primary color light may be adjusted to be shifted in the forward direction along the x-axis by V1, and the shift amount of the blue primary color light to be adjusted is + V1. If the target point is located at the left side of the first segment t1 and the blue primary color light is shifted forward along the x-axis by V1 relative to the green primary color light, the blue primary color light can be adjusted to shift backward along the x-axis by V1, and at this time, the shift amount of the blue primary color light to be adjusted is-V1. The position of the target point may be confirmed by judging the coordinates of the target point, and for example, when the abscissa of the target point is less than 1920, the target point may be considered to be located on the left side of the first line t 1.
After the coordinates of the first primary color light after being corrected are determined, the corrected coordinates may be image pixel signals, and the image pixel signals may be converted into light modulation signals in the controller, where the light modulation signals may be used to drive the light valve and control the micro-mirror in the light valve. The light modulation signals may include corrected image pixel signals of the first primary color light and uncorrected image pixel signals of the fixed primary color light.
And 310, displaying an image based on the light modulation signal.
The projection lens can receive the light beam emitted by the light valve, and the first primary color light modulated by the light valve is irradiated to the projection lens according to the adjusted position, so that the coincidence degree of the first primary color light and the fixed primary color light in the image projected to the screen by the projection lens is improved.
As shown in fig. 13, fig. 13 is a schematic diagram of a shift of primary light provided in an embodiment of the present application. After the first primary color light is corrected, the maximum offset generated by the red primary color light relative to the green primary color light and the blue primary color light relative to the green primary color light is only 0.2 pixel. Compared with the related art, the maximum offset generated by the red primary light relative to the green primary light and the blue primary light relative to the green primary light is 0.5 pixels, and the dispersion problem is obviously improved.
To sum up, the embodiment of the present application provides a method for displaying a laser projection image, which includes obtaining a first distance between a target point in a screen and a projection lens, obtaining a primary color offset corresponding to the first distance from a dispersion correspondence, so as to obtain a target offset, and correcting a first primary color light at the target point according to the target offset. Therefore, the projection equipment can project the display image to the screen according to the position of the corrected first primary color light so as to display the adjusted image, and the coincidence degree of the first primary color light and the fixed primary color light projected to the screen can be improved so as to improve the dispersion problem. The problem that the definition of the display image of the projection equipment is poor in the related technology can be solved, and the effect of improving the definition of the display image of the projection equipment is achieved.
Fig. 14 is a block diagram of a laser projection apparatus provided in an embodiment of the present application, where the laser projection apparatus 1300 includes: a controller 1310, a laser light source 1320, and a light valve 1330;
a controller 1310 configured to obtain a dispersion correspondence relationship, where the dispersion correspondence relationship includes a correspondence relationship between a reference distance and a primary color offset, the reference distance is used to represent a distance between a point in a screen and a projection lens, the screen is used to display a display image projected by the projection lens, and the primary color offset is an offset of a first primary color light projected to the point in the screen with respect to a fixed primary color light;
a controller 1310, further configured to obtain a first distance between a target point in the screen and the projection lens, where the target point is a point in the screen;
the controller 1310 is further configured to obtain a primary color offset corresponding to the first distance from the dispersion correspondence to obtain a target offset;
a controller 1310, further configured to correct the first primary color light at the target point based on the target offset;
a controller 1310, further configured to obtain an optical modulation signal according to the position of the fixed primary color light and the position of the corrected first primary color light;
a laser light source 1320 for providing a laser beam to the light valve 1330 under the control of the controller 1310;
the light valve 1330 performs display of an image based on the light modulation signal under the control of the controller 1310.
Alternatively, the laser light source may include a blue laser emitter, a green laser emitter and a red laser emitter. Wherein, blue laser emitter can send blue laser beam, and green laser emitter can send green laser beam, and red laser emitter can send red laser beam.
Fig. 15 is a block diagram of a laser projection apparatus according to an embodiment of the present application, where the laser projection apparatus 1400 includes:
the relation obtaining module 1410 is configured to obtain a dispersion correspondence relationship, where the dispersion correspondence relationship includes a correspondence relationship between a reference distance and a primary color offset, the reference distance is used to represent a distance between a point in a screen and the projection lens, the screen is used to display a display image projected by the projection lens, and the primary color offset is an offset of the first primary color light projected to the point in the screen relative to the fixed primary color light.
The distance obtaining module 1420 is configured to obtain a first distance between a target point in the screen and the projection lens, where the target point is a point in the screen.
The offset obtaining module 1430 is configured to obtain a primary color offset corresponding to the first distance from the dispersion correspondence, so as to obtain a target offset.
A correction module 1440 for correcting the first primary color light at the target point based on the target offset;
a control module 1450, configured to obtain an optical modulation signal according to the position of the fixed primary color light and the position of the corrected first primary color light;
and a display module 1460 for displaying an image based on the light modulation signal.
Optionally, as shown in fig. 16, fig. 16 is a block diagram of another laser projection apparatus provided in this embodiment of the present application, and the laser projection apparatus 1400 may further include:
the second distance determining module 1470 is configured to obtain a second distance between the target point and a first point, where the first point is a position where the projection lens projects on a plane where the screen is located.
A third distance determining module 1480 is configured to obtain a third distance between the projection lens and the screen.
A first distance determining module 1490 forDetermining a first distance based on a first formula, the first formula being:
wherein X is a first distance, Y is a second distance, and Z is a third distance.
Optionally, the relationship obtaining module in the laser projection apparatus may include:
the first acquisition unit is used for acquiring a plurality of primary color offsets of first primary color light relative to fixed primary color light at a plurality of reference points on a screen, and the distances between at least two reference points in the plurality of reference points and the projection lens are different.
And the second acquisition unit is used for acquiring a fourth distance between each reference point and the projection lens.
And the first determining unit is used for carrying out normalization processing on the plurality of fourth distances to obtain a plurality of reference distances.
A second determining unit for determining a plurality of reference distance ranges based on the plurality of reference distances, the reference distance ranges including the plurality of reference distances.
And a third determining unit configured to determine a dispersion correspondence relationship based on the plurality of reference distance ranges and the plurality of primary color offsets, where the plurality of reference distance ranges and the plurality of primary color offsets correspond to each other one to one in the dispersion correspondence relationship.
Optionally, the offset obtaining module in the laser projection apparatus may include:
and the ratio determining unit is used for determining the ratio between the first distance and the maximum distance, wherein the maximum distance is the maximum distance between the projection lens and a point in the screen.
And the first target determining unit is used for determining a reference distance range corresponding to the ratio from a plurality of reference distance ranges to obtain a target reference range.
And the second target determining unit is used for determining the primary color offset corresponding to the target reference range from the dispersion corresponding relation so as to obtain the target offset.
Optionally, the rectification module in the laser projection apparatus may include:
and the transverse acquisition unit is used for determining the transverse offset of the first primary light at the target point based on a second formula, wherein the second formula is that V is U multiplied by sin alpha, U is the target offset, V is the transverse offset, and alpha is an included angle between a first line segment and a second line segment, the first line segment is the projection of the optical axis of the projection lens on the plane where the screen is located, the second line segment is the line segment between the first point and the target point, and the first point is the position where the orthographic projection of the projection lens on the plane where the screen is located.
A longitudinal direction obtaining unit, configured to determine a longitudinal direction offset amount of the first primary color light at the target point based on a third formula, where W is the longitudinal direction offset amount.
And the correction unit is used for determining the adjusted position of the first primary color light at the target point based on the transverse offset and the longitudinal offset as well as the position of the target point in the screen so as to correct the first primary color light at the target point.
To sum up, the laser projection apparatus provided in the embodiment of the present application obtains the primary color offset corresponding to the first distance from the dispersion correspondence by obtaining the first distance between the target point in the screen and the projection lens, so as to obtain the target offset, and then corrects the first primary color light at the target point according to the target offset. Therefore, the projection equipment can project the display image to the screen according to the position of the corrected first primary color light so as to display the adjusted image, and the coincidence degree of the first primary color light and the fixed primary color light projected to the screen can be improved so as to improve the dispersion problem. The problem that the definition of the display image of the projection equipment is poor in the related technology can be solved, and the effect of improving the definition of the display image of the projection equipment is achieved.
In addition, the present application further provides a laser projection apparatus, which includes a processor and a memory, where the memory stores at least one instruction, at least one program, a code set, or a set of instructions, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by the processor to implement the laser projection image display method provided by any one of the above embodiments.
In addition, the present application further provides a computer storage medium, where at least one instruction, at least one program, a code set, or a set of instructions is stored, and the at least one instruction, the at least one program, the code set, or the set of instructions is loaded and executed by a processor to implement any one of the laser projection image display methods provided by the foregoing embodiments.
In this application, the terms "first," "second," "third," "fourth," and "fifth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The term "plurality" means two or more unless expressly limited otherwise.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.
The above description is only exemplary of the present application and should not be taken as limiting, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (10)
1. A method of displaying a laser projection image, the method comprising:
acquiring a dispersion corresponding relation, wherein the dispersion corresponding relation comprises a corresponding relation between a reference distance and a primary color offset, the reference distance is used for representing the distance between one point in a screen and a projection lens, the screen is used for displaying a display image projected by the projection lens, and the primary color offset is the offset of first primary color light projected to the one point in the screen relative to fixed primary color light;
acquiring a first distance between a target point in the screen and the projection lens, wherein the target point is one point in the screen;
obtaining the primary color offset corresponding to the first distance from the dispersion corresponding relation to obtain a target offset;
correcting the first primary color light at the target point based on the target offset amount;
acquiring an optical modulation signal according to the position of the fixed primary color light and the position of the corrected first primary color light;
and displaying an image based on the light modulation signal.
2. The method of claim 1, wherein obtaining the first distance between the target point in the screen and the projection lens comprises:
acquiring a second distance between the target point and a first point, wherein the first point is the position of the orthographic projection of the projection lens on the plane where the screen is located;
acquiring a third distance between the projection lens and the screen;
based on the first formula, determiningThe first distance, the first formula is:
wherein X is the first distance, Y is the second distance, and Z is the third distance.
3. The method of claim 1, wherein obtaining the dispersion map comprises:
acquiring a plurality of primary color offsets of the first primary color light relative to the fixed primary color light at a plurality of reference points on the screen, wherein the distances between at least two reference points in the plurality of reference points and the projection lens are different;
acquiring a fourth distance between each reference point and the projection lens;
normalizing the plurality of fourth distances to obtain a plurality of reference distances;
determining a plurality of reference distance ranges based on the plurality of reference distances, the reference distance ranges including a plurality of reference distances;
determining the dispersion correspondence, in which the plurality of reference distance ranges and the plurality of base color offsets correspond one-to-one, based on the plurality of reference distance ranges and the plurality of base color offsets.
4. The method according to claim 3, wherein said obtaining the primary color offset corresponding to the first distance from the dispersion corresponding relation to obtain a target offset comprises:
determining a ratio between the first distance and a maximum distance, the maximum distance being a maximum distance between the projection lens and a point in the screen;
determining a reference distance range corresponding to the ratio from the plurality of reference distance ranges to obtain a target reference range;
and determining the primary color offset corresponding to the target reference range from the dispersion corresponding relation to obtain a target offset.
5. The method of claim 1, wherein the correcting the first primary color light at the target point based on the target offset amount comprises:
determining a transverse offset of the first primary color light at the target point based on a second formula, wherein the second formula is that V is U × sin α, where U is the target offset, V is the transverse offset, and α is an included angle between a first line segment and a second line segment, the first line segment is a projection of an optical axis of the projection lens on a plane where the screen is located, the second line segment is a line segment between a first point and the target point, and the first point is a position where an orthogonal projection of the projection lens on the plane where the screen is located;
determining a longitudinal offset amount of the first primary color light at the target point based on a third formula, where W is the longitudinal offset amount;
and determining the adjusted position of the first primary color light at the target point based on the transverse offset and the longitudinal offset and the position of the target point in the screen so as to correct the first primary color light at the target point.
6. The method of claim 1, wherein the screen comprises a plurality of regions;
the acquiring a first distance between a target point in a screen and a projection lens includes:
acquiring a first distance between a target point in each region and the projection lens;
the correcting the first primary color light at the target point comprises:
and for each region, taking the target offset of the target point in the region as the target offset of the region to correct the first primary color light at the region.
7. A laser projection device, characterized in that the laser projection device comprises: a controller, a laser light source and a light valve;
the controller is used for acquiring a dispersion corresponding relation, wherein the dispersion corresponding relation comprises a corresponding relation between a reference distance and a primary color offset, the reference distance is used for representing the distance between one point in a screen and a projection lens, the screen is used for displaying a display image projected by the projection lens, and the primary color offset is the offset of first primary color light projected to one point in the screen relative to fixed primary color light;
the controller is further configured to obtain a first distance between a target point in the screen and the projection lens, where the target point is one point in the screen;
the controller is further configured to obtain a primary color offset corresponding to the first distance from the dispersion corresponding relationship to obtain a target offset;
the controller is further configured to correct the first primary color light at the target point based on the target offset amount;
the controller is further used for acquiring an optical modulation signal according to the position of the fixed primary color light and the position of the corrected first primary color light;
the laser light source is used for providing a laser beam to the light valve under the control of the controller;
and the light valve is used for displaying images based on the light modulation signal under the control of the controller.
8. The laser projection device of claim 7, wherein the laser light source includes a blue laser emitter, a green laser emitter, and a red laser emitter.
9. A laser projection device comprising a processor and a memory having stored therein at least one instruction, at least one program, set of codes, or set of instructions that is loaded and executed by the processor to implement the laser projection image display method of any of claims 1 to 6.
10. A computer storage medium having stored therein at least one instruction, at least one program, a set of codes, or a set of instructions, which is loaded and executed by a processor to implement the laser projection image display method of any of claims 1 to 6.
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| CN202210589268.8A CN114842779A (en) | 2022-05-26 | 2022-05-26 | Laser projection image display method, apparatus and computer storage medium |
| 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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| WO2023071698A1 (en) * | 2021-10-29 | 2023-05-04 | 青岛海信激光显示股份有限公司 | Laser projection device, and dispersion correction method for projected image |
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| WO2023071698A1 (en) * | 2021-10-29 | 2023-05-04 | 青岛海信激光显示股份有限公司 | Laser projection device, and dispersion correction method for projected image |
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