CN117440138B - Projector projection image display control method and system - Google Patents
Projector projection image display control method and system Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000003086 colorant Substances 0.000 claims abstract description 59
- 238000012937 correction Methods 0.000 claims abstract description 39
- 239000004973 liquid crystal related substance Substances 0.000 claims abstract description 38
- 238000001514 detection method Methods 0.000 claims abstract description 14
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- 238000009434 installation Methods 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
- H04N9/3185—Geometric adjustment, e.g. keystone or convergence
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3141—Constructional details thereof
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3191—Testing thereof
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Abstract
The invention discloses a projector projection image display control method and a system, which relate to the technical field of projection equipment and comprise the following steps: correcting the projection angle according to the reflection condition of the laser from the projection screen; performing centering correction by using a four-point positioning method; detecting the position relation between the projection image and the projection screen, and scaling the projection image; the white light is divided into three primary colors of red, green and blue through a light splitting system, the three primary colors of light are irradiated onto the reflective LCOS chip, and parameters of liquid crystal molecules on the LCOS chip are controlled; converging the three primary color light rays reflected by the LCOS chip according to a proportion to obtain projection light rays; acquiring diffuse scattered light of a projection picture, and judging whether the intensity of the diffuse scattered light is preset intensity or not; and analyzing and obtaining the resolution of the projection picture. Through setting up intensity detection module, parameter control module and resolution detection module, guarantee the resolution ratio and the luminance of projection picture, and then reach better projection effect.
Description
Technical Field
The invention relates to the technical field of projection equipment, in particular to a method and a system for controlling display of projection images of a projector.
Background
Currently, most of projection light machines use DLP technology, wherein DLP technology is a projection technology that uses a Digital Micromirror Device (DMD) chip as an imaging device by using a texas instruments in the united states, and a projected image is realized by adjusting reflected light, and the color effect of a DLP projector depends on the movement of a color wheel and the DMD chip, so that a single-chip DLP projection system adopts a reflective structure.
When a picture is projected onto a projection screen, the existing projector projection image display technology has different reflection effects due to different materials of the projection screen, and the adjustment of the reflection effects is insufficient due to the lack of the projection image display, so that the brightness or resolution of the picture is insufficient, and meanwhile, the relative position relationship between the projector and the projection screen has deviation, so that the projection picture is deviated.
Disclosure of Invention
In order to solve the technical problems, the technical scheme provides a projector projection image display control method and a system, which solve the problems that when a picture is projected to a projection screen in the prior projector projection image display technology provided in the background technology, reflection effects are different due to different materials of the projection screen, and the reflection effects are adjusted due to insufficient display of the projection image, so that the brightness of the picture is insufficient or the resolution is insufficient, and meanwhile, the relative position relation between the projector and the projection screen has deviation, so that the projection picture is deviated.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a projector projection image display control method, comprising:
the projector emits laser with the wavelength of a preset value on the projection screen, the projection angle is corrected according to the reflection condition of the laser from the projection screen, and the projection angle is vertical to the projection screen after correction;
centering correction is carried out by using a four-point positioning method, and after correction, the emission center of the projector coincides with the center of the projection screen;
after centering correction, detecting the position relation between the projection image and the projection screen, and scaling the projection image to meet the requirement that the scaled projection image is consistent with the projection screen in size;
the method comprises the steps of obtaining white light emitted by a projector bulb, dividing the white light into red, green and blue three primary colors through a light splitting system, irradiating the three primary colors onto a reflective LCOS chip, controlling parameters of liquid crystal molecules on the LCOS chip, controlling the intensity of the three primary colors reflected by each pixel point of the LCOS chip and whether the three primary colors are reflected by each pixel point of the LCOS chip or not by the liquid crystal molecules, wherein if the intensity of the three primary colors reflected by the pixel point is 0, the three primary colors are not reflected by the pixel point, and if the intensity of the three primary colors reflected by the pixel point is greater than 0, the three primary colors are reflected by the pixel point;
the three primary color light rays reflected by the LCOS chip are converged in proportion to obtain projection light rays, the color of the projection light rays is determined by the converging proportion of the reflected three primary color light rays, the intensity of the projection light rays is determined by the intensity of the reflected three primary color light rays, and the projector emits the projection light rays to the projection screen;
acquiring diffuse scattered light of a projection picture, judging whether the intensity of the diffuse scattered light is preset intensity, and if so, not performing any treatment;
if not, carrying out first adjustment on parameters of the liquid crystal molecules, wherein the intensity of the adjusted diffuse scattering light is preset;
analyzing and obtaining the resolution of the projection picture, and if the resolution of the projection picture is larger than the preset resolution, not performing any treatment;
if not, the parameters of the liquid crystal molecules are subjected to second adjustment, so that the resolution of the adjusted projection picture is larger than the preset resolution.
Preferably, the correcting the projection angle according to the reflection condition of the laser from the projection screen includes the following steps:
acquiring a first position of laser emitted by a projector, and acquiring a second position of reflected light of the laser received by the projector from a projection screen;
acquiring path time from the laser of the projector to the reflected laser received by the projector, calculating a laser movement distance according to the path time and the laser speed, and using one half of the laser movement distance as the distance between the projector and a projection screen;
calculating an included angle between the projection angle of the projector and the vertical direction of the projection screen by using an angle calculation formula；
The projector rotates along the straight line where the first position and the second position are located, the rotation direction is a direction far away from the second position, and the rotation angle is；
The angle calculation formula is as follows:；
wherein tan is a tangent function,an included angle between the projection angle of the projector and the vertical direction of the projection screen is half the distance between the first position and the second positionB is the distance between the projector and the projection screen.
Preferably, the centering correction using the four-point positioning method includes the steps of:
the method comprises the steps of obtaining four corner positions of a projection screen and obtaining projection positions of laser emitted by a projector on the projection screen;
calculating to obtain the central positions of the four corners of the projection screen, and obtaining the direction vector from the projection position to the central position;
and when centering, the projection lens of the projector is adjusted in a translation mode, the translation direction is along the direction vector, and the translation distance is the distance from the projection position to the central position.
Preferably, the detecting the positional relationship between the projection image and the projection screen includes the following steps:
acquiring the edge position of a projection screen and acquiring the edge position of a projection image;
obtaining the length dimension of the projection screen according to the edge position of the projection screen, and obtaining the width dimension of the projection screen;
obtaining the length dimension of the projection image according to the edge position of the projection image, and obtaining the width dimension of the projection image;
using the ratio of the length dimension of the projection screen to the length dimension of the projection image as a first scaling ratio;
the ratio of the width dimension of the projection screen to the width dimension of the projected image is used as the second scaling ratio.
Preferably, the zooming of the projection image includes the steps of:
the projector transversely scales the projection image, and the scaling adopts a first scaling proportion;
the projector longitudinally scales the projected image by a second scaling ratio.
Preferably, the first adjustment of the parameter of the liquid crystal molecules includes the following steps:
increasing the intensity of a pixel point reflecting light rays of three primary colors in an LCOS chip according to a preset amplitude;
after each increase, judging whether the intensity of the diffuse scattering light is preset intensity, if so, stopping increasing the intensity of the pixel points reflecting the light of the three primary colors in the LCOS chip;
if not, continuing to increase the intensity of the pixel point reflecting the light rays of the three primary colors in the LCOS chip by the preset amplitude.
Preferably, the analyzing to obtain the resolution of the projection screen includes the steps of:
intercepting a sampling picture from the projection picture, and amplifying the sampling picture to a preset multiple;
performing edge recognition on the pixel points in the amplified sampling picture to obtain the pixel points in the sampling picture;
counting the number of pixel points in a sampling picture, and counting the length and width dimensions of the sampling picture;
the number of pixel points in a unit area is obtained and used as the resolution of a projection picture.
Preferably, the second adjustment of the parameter of the liquid crystal molecules includes the following steps:
in a unit area, increasing the number of pixel points which participate in reflecting light rays of three primary colors in the LCOS chip by the preset number;
after each increase, judging whether the resolution of the projection picture is larger than the preset resolution, if so, stopping increasing the number of pixels participating in reflecting the light rays of the three primary colors in the LCOS chip;
if not, the number of pixels participating in reflecting the light rays of the three primary colors in the LCOS chip is increased by the preset number.
A projector projection image display control system is used for realizing the projector projection image display control method, and comprises the following steps:
the angle correction module is used for correcting the projection angle according to the reflection condition of the laser from the projection screen;
the centering correction module is used for centering correction by using a four-point positioning method;
the image scaling module detects the position relation between the projection image and the projection screen and scales the projection image;
the display control module divides the white light into three primary colors of red, green and blue through the light splitting system, the three primary colors of light are irradiated onto the reflective LCOS chip, parameters of liquid crystal molecules on the LCOS chip are controlled, and the three primary colors of light reflected by the LCOS chip are converged in proportion to obtain projection light;
the intensity detection module judges whether the intensity of the diffuse scattered light is preset intensity or not;
the parameter control module is used for carrying out first adjustment on the parameters of the liquid crystal molecules and carrying out second adjustment on the parameters of the liquid crystal molecules;
and the resolution detection module is used for analyzing and acquiring the resolution of the projection picture.
Compared with the prior art, the invention has the beneficial effects that:
through setting up intensity detection module, parameter control module and resolution detection module, detect the projection picture, according to the resolution ratio of projection picture and diffuse scattering light's intensity, the parameter to the liquid crystal molecule carries out first adjustment and carries out the second adjustment to the parameter of liquid crystal molecule to guarantee to different material projection screens, can both guarantee the resolution ratio and the luminance of projection picture, and then reach better projecting effect, in addition, through angle correction module, centering correction module and image scaling module, can finely tune the relative position of projecting apparatus and projection screen, when eliminating the installation, because the error that measurement or other causes lead to, avoid projection picture skew or deformation.
Drawings
FIG. 1 is a schematic flow chart of a method for controlling the display of a projected image of a projector according to the present invention;
FIG. 2 is a schematic diagram of a process for correcting a projection angle according to the reflection condition of laser from a projection screen;
FIG. 3 is a schematic diagram of a centering correction process using a four-point positioning method according to the present invention;
FIG. 4 is a schematic diagram of a flow chart for detecting the position relationship between a projection image and a projection screen according to the present invention;
FIG. 5 is a schematic diagram of a zooming process for a projection image according to the present invention;
FIG. 6 is a schematic diagram of a first adjustment process for parameters of liquid crystal molecules according to the present invention;
FIG. 7 is a schematic diagram of a resolution process for analyzing and obtaining a projection screen according to the present invention;
fig. 8 is a schematic diagram of a second flow chart for adjusting parameters of liquid crystal molecules according to the present invention.
Detailed Description
The following description is presented to enable one of ordinary skill in the art to make and use the invention. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
Referring to fig. 1, a projector projection image display control method includes:
the projector emits laser with the wavelength of a preset value on the projection screen, the projection angle is corrected according to the reflection condition of the laser from the projection screen, and the projection angle is vertical to the projection screen after correction;
centering correction is carried out by using a four-point positioning method, and after correction, the emission center of the projector coincides with the center of the projection screen;
after centering correction, detecting the position relation between the projection image and the projection screen, and scaling the projection image to meet the requirement that the scaled projection image is consistent with the projection screen in size;
the method comprises the steps of obtaining white light emitted by a projector bulb, dividing the white light into red, green and blue three primary colors through a light splitting system, irradiating the three primary colors onto a reflective LCOS chip, controlling parameters of liquid crystal molecules on the LCOS chip, controlling the intensity of the three primary colors reflected by each pixel point of the LCOS chip and whether the three primary colors are reflected by each pixel point of the LCOS chip or not by the liquid crystal molecules, wherein if the intensity of the three primary colors reflected by the pixel point is 0, the three primary colors are not reflected by the pixel point, and if the intensity of the three primary colors reflected by the pixel point is greater than 0, the three primary colors are reflected by the pixel point;
the three primary color light rays reflected by the LCOS chip are converged in proportion to obtain projection light rays, the color of the projection light rays is determined by the converging proportion of the reflected three primary color light rays, the intensity of the projection light rays is determined by the intensity of the reflected three primary color light rays, and the projector emits the projection light rays to the projection screen;
acquiring diffuse scattered light of a projection picture, judging whether the intensity of the diffuse scattered light is preset intensity, and if so, not performing any treatment;
if not, carrying out first adjustment on parameters of the liquid crystal molecules, wherein the intensity of the adjusted diffuse scattering light is preset;
analyzing and obtaining the resolution of the projection picture, and if the resolution of the projection picture is larger than the preset resolution, not performing any treatment;
if not, the parameters of the liquid crystal molecules are subjected to second adjustment, so that the resolution of the adjusted projection picture is larger than the preset resolution.
Referring to fig. 2, according to the reflection condition of the laser light from the projection screen, the projection angle correction includes the following steps:
acquiring a first position of laser emitted by a projector, and acquiring a second position of reflected light of the laser received by the projector from a projection screen;
acquiring path time from the laser of the projector to the reflected laser received by the projector, calculating a laser movement distance according to the path time and the laser speed, and using one half of the laser movement distance as the distance between the projector and a projection screen;
calculating an included angle between the projection angle of the projector and the vertical direction of the projection screen by using an angle calculation formula；
The projector rotates along the straight line where the first position and the second position are located, the rotation direction is a direction far away from the second position, and the rotation angle is；
The angle calculation formula is as follows:；
wherein tan is a tangent function,the angle between the projection angle of the projector and the vertical direction of the projection screen is a half of the distance between the first position and the second position, and b is the distance between the projector and the projection screen;
the projection screen is naturally drooping, so it is vertical, but the projector has error due to installation, so there is a certain deviation with the angle of the vertical projection screen, so it is necessary to rotate the projector a small amount to make the emitted light coincide with the reflected light, so it is necessary to know the angle between the projection angle of the projector and the vertical direction of the projection screen, and when the angle is rotatedWhen the projector projects the laser beam, the projection angle of the projector is perpendicular to the projection screen, and the rotation direction of the projector is necessarily in the plane of the laser beam emitted by the projector and the received laser beam, so that the direction along the plane is the connecting direction of the first position and the second position.
Referring to fig. 3, the centering correction using the four-point positioning method includes the steps of:
the method comprises the steps of obtaining four corner positions of a projection screen and obtaining projection positions of laser emitted by a projector on the projection screen;
calculating to obtain the central positions of the four corners of the projection screen, and obtaining the direction vector from the projection position to the central position;
when centering, the projection lens of the projector is adjusted in a translation mode, the translation direction is along a direction vector, and the translation distance is the distance from the projection position to the central position;
the centering correction enables the laser emitted by the projector to vertically project on the projection screen, so that the projection picture is not deviated.
Referring to fig. 4, detecting the positional relationship of the projection image and the projection screen includes the steps of:
acquiring the edge position of a projection screen and acquiring the edge position of a projection image;
obtaining the length dimension of the projection screen according to the edge position of the projection screen, and obtaining the width dimension of the projection screen;
obtaining the length dimension of the projection image according to the edge position of the projection image, and obtaining the width dimension of the projection image;
using the ratio of the length dimension of the projection screen to the length dimension of the projection image as a first scaling ratio;
the ratio of the width dimension of the projection screen to the width dimension of the projected image is used as the second scaling ratio.
Referring to fig. 5, scaling the projected image includes the steps of:
the projector transversely scales the projection image, and the scaling adopts a first scaling proportion;
the projector longitudinally expands and contracts the projection image, and the expansion and contraction adopts a second expansion and contraction proportion;
after the expansion and contraction, the projection image is ensured to be matched with the projection screen in the transverse direction and the longitudinal direction.
Referring to fig. 6, the first adjustment of the parameters of the liquid crystal molecules includes the steps of:
increasing the intensity of a pixel point reflecting light rays of three primary colors in an LCOS chip according to a preset amplitude;
after each increase, judging whether the intensity of the diffuse scattering light is preset intensity, if so, stopping increasing the intensity of the pixel points reflecting the light of the three primary colors in the LCOS chip;
if not, continuing to increase the intensity of the pixel points reflecting the light rays of the three primary colors in the LCOS chip by the preset amplitude;
the preset amplitude is a sufficiently small value, so that according to the continuity of the function, when the intensity of the pixel point reflecting the light rays with three primary colors in the LCOS chip is increased continuously by the preset amplitude, a moment is necessarily present, so that the difference between the intensity of the diffuse scattered light rays and the preset intensity is smaller than the preset difference, and therefore, the adjustment requirement is met.
Referring to fig. 7, analyzing the resolution of the acquired projection screen includes the steps of:
intercepting a sampling picture from the projection picture, and amplifying the sampling picture to a preset multiple;
performing edge recognition on the pixel points in the amplified sampling picture to obtain the pixel points in the sampling picture;
counting the number of pixel points in a sampling picture, and counting the length and width dimensions of the sampling picture;
the number of pixel points in a unit area is obtained and used as the resolution of a projection picture;
due to the different projection screens, under the same projection conditions, the different projection screens have different resolutions due to diffuse reflection, and therefore, targeted adjustment is required.
Referring to fig. 8, the second adjustment of the parameters of the liquid crystal molecules includes the steps of:
in a unit area, increasing the number of pixel points which participate in reflecting light rays of three primary colors in the LCOS chip by the preset number;
after each increase, judging whether the resolution of the projection picture is larger than the preset resolution, if so, stopping increasing the number of pixels participating in reflecting the light rays of the three primary colors in the LCOS chip;
if not, continuing to increase the number of pixel points which participate in reflecting the light rays of the three primary colors in the LCOS chip by the preset number;
the resolution is determined by the number of pixels in a unit area, so when the resolution detected by the projection picture is insufficient, the resolution can be improved by the pixels participating in reflecting the light rays of the three primary colors in the LCOS chip, when the number of pixels is increased continuously, a moment is necessarily existed, and the resolution of the projection picture is larger than the preset resolution, so that the adjustment requirement is met.
A projector projection image display control system is used for realizing the projector projection image display control method, and comprises the following steps:
the angle correction module is used for correcting the projection angle according to the reflection condition of the laser from the projection screen;
the centering correction module is used for centering correction by using a four-point positioning method;
the image scaling module detects the position relation between the projection image and the projection screen and scales the projection image;
the display control module divides the white light into three primary colors of red, green and blue through the light splitting system, the three primary colors of light are irradiated onto the reflective LCOS chip, parameters of liquid crystal molecules on the LCOS chip are controlled, and the three primary colors of light reflected by the LCOS chip are converged in proportion to obtain projection light;
the intensity detection module judges whether the intensity of the diffuse scattered light is preset intensity or not;
the parameter control module is used for carrying out first adjustment on the parameters of the liquid crystal molecules and carrying out second adjustment on the parameters of the liquid crystal molecules;
and the resolution detection module is used for analyzing and acquiring the resolution of the projection picture.
The working process of the projector projection image display control system is as follows:
step one: the projector emits laser with the wavelength of a preset value on the projection screen, and the angle correction module corrects the projection angle according to the reflection condition of the laser from the projection screen, and the projection angle is vertical to the projection screen after correction;
step two: the centering correction module uses a four-point positioning method to perform centering correction, and after correction, the emission center of the projector coincides with the center of the projection screen;
step three: after centering correction, the image scaling module detects the position relation between the projection image and the projection screen, scales the projection image, and meets the requirement that the scaled projection image is consistent with the projection screen in size;
step four: the display control module acquires white light rays emitted by the projector bulb, the white light rays are divided into three primary colors of red, green and blue through the light splitting system, the three primary colors of light rays are irradiated onto the reflective LCOS chip, parameters of liquid crystal molecules on the LCOS chip are controlled, and the liquid crystal molecules control the intensity of the three primary colors of light rays reflected by each pixel point of the LCOS chip and whether the three primary colors of light rays are reflected by each pixel point;
step five: the display control module converges the three primary color lights reflected by the LCOS chip in proportion to obtain projection light emitted by the projection light projector to the projection screen;
step six: the intensity detection module acquires diffuse scattered light of the projection picture, judges whether the intensity of the diffuse scattered light is preset intensity, and does not perform any treatment if the intensity of the diffuse scattered light is preset intensity;
if not, the parameter control module carries out first adjustment on the parameters of the liquid crystal molecules, and the intensity of the adjusted diffuse scattering light is preset;
step seven: the resolution detection module analyzes and acquires the resolution of the projection picture, and if the resolution of the projection picture is larger than the preset resolution, no processing is performed;
if not, the parameter control module carries out second adjustment on the parameters of the liquid crystal molecules, and the resolution of the adjusted projection picture is more than the preset resolution.
Still further, the present invention also proposes a storage medium having a computer-readable program stored thereon, which when called, performs the projector projection image display control method described above.
It is understood that the storage medium may be a magnetic medium, e.g., floppy disk, hard disk, magnetic tape; optical media such as DVD; or a semiconductor medium such as a solid state disk SolidStateDisk, SSD, etc.
In summary, the invention has the advantages that: through setting up intensity detection module, parameter control module and resolution detection module, detect the projection picture, according to the resolution ratio of projection picture and diffuse scattering light's intensity, the parameter to the liquid crystal molecule carries out first adjustment and carries out the second adjustment to the parameter of liquid crystal molecule to guarantee to different material projection screens, can both guarantee the resolution ratio and the luminance of projection picture, and then reach better projecting effect, in addition, through angle correction module, centering correction module and image scaling module, can finely tune the relative position of projecting apparatus and projection screen, when eliminating the installation, because the error that measurement or other causes lead to, avoid projection picture skew or deformation.
The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made therein without departing from the spirit and scope of the invention, which is defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A projector projection image display control method, characterized by comprising:
the projector emits laser with the wavelength of a preset value on the projection screen, the projection angle is corrected according to the reflection condition of the laser from the projection screen, and the projection angle is vertical to the projection screen after correction;
centering correction is carried out by using a four-point positioning method, and after correction, the emission center of the projector coincides with the center of the projection screen;
after centering correction, detecting the position relation between the projection image and the projection screen, and scaling the projection image to meet the requirement that the scaled projection image is consistent with the projection screen in size;
the method comprises the steps of obtaining white light emitted by a projector bulb, dividing the white light into red, green and blue three primary colors through a light splitting system, irradiating the three primary colors onto a reflective LCOS chip, controlling parameters of liquid crystal molecules on the LCOS chip, controlling the intensity of the three primary colors reflected by each pixel point of the LCOS chip and whether the three primary colors are reflected by each pixel point of the LCOS chip or not by the liquid crystal molecules, wherein if the intensity of the three primary colors reflected by the pixel point is 0, the three primary colors are not reflected by the pixel point, and if the intensity of the three primary colors reflected by the pixel point is greater than 0, the three primary colors are reflected by the pixel point;
the three primary color light rays reflected by the LCOS chip are converged in proportion to obtain projection light rays, the color of the projection light rays is determined by the converging proportion of the reflected three primary color light rays, the intensity of the projection light rays is determined by the intensity of the reflected three primary color light rays, and the projector emits the projection light rays to the projection screen;
acquiring diffuse scattered light of a projection picture, judging whether the intensity of the diffuse scattered light is preset intensity, and if so, not performing any treatment;
if not, carrying out first adjustment on parameters of the liquid crystal molecules, wherein the intensity of the adjusted diffuse scattering light is preset;
analyzing and obtaining the resolution of the projection picture, and if the resolution of the projection picture is larger than the preset resolution, not performing any treatment;
if not, the parameters of the liquid crystal molecules are subjected to second adjustment, so that the resolution of the adjusted projection picture is larger than the preset resolution.
2. The method of claim 1, wherein the performing projection angle correction according to the reflection of the laser light from the projection screen comprises the steps of:
acquiring a first position of laser emitted by a projector, and acquiring a second position of reflected light of the laser received by the projector from a projection screen;
acquiring path time from the laser of the projector to the reflected laser received by the projector, calculating a laser movement distance according to the path time and the laser speed, and using one half of the laser movement distance as the distance between the projector and a projection screen;
calculating an included angle between the projection angle of the projector and the vertical direction of the projection screen by using an angle calculation formula；
The projector rotates along the straight line where the first position and the second position are located, the rotation direction is a direction far away from the second position, and the rotation angle is；
The angle calculation formula is as follows:
；
wherein tan is a tangent function,the angle a is half of the distance between the first position and the second position, and the angle b is the distance between the projector and the projection screen.
3. The method of controlling display of a projected image of a projector according to claim 2, wherein said centering correction using the four-point positioning method comprises the steps of:
the method comprises the steps of obtaining four corner positions of a projection screen and obtaining projection positions of laser emitted by a projector on the projection screen;
calculating to obtain the central positions of the four corners of the projection screen, and obtaining the direction vector from the projection position to the central position;
and when centering, the projection lens of the projector is adjusted in a translation mode, the translation direction is along the direction vector, and the translation distance is the distance from the projection position to the central position.
4. A projector projection image display control method according to claim 3, wherein said detecting the positional relationship of the projection image and the projection screen comprises the steps of:
acquiring the edge position of a projection screen and acquiring the edge position of a projection image;
obtaining the length dimension of the projection screen according to the edge position of the projection screen, and obtaining the width dimension of the projection screen;
obtaining the length dimension of the projection image according to the edge position of the projection image, and obtaining the width dimension of the projection image;
using the ratio of the length dimension of the projection screen to the length dimension of the projection image as a first scaling ratio;
the ratio of the width dimension of the projection screen to the width dimension of the projected image is used as the second scaling ratio.
5. The method of claim 4, wherein scaling the projected image comprises:
the projector transversely scales the projection image, and the scaling adopts a first scaling proportion;
the projector longitudinally scales the projected image by a second scaling ratio.
6. The method of claim 5, wherein the first adjustment of the parameters of the liquid crystal molecules comprises the steps of:
increasing the intensity of a pixel point reflecting light rays of three primary colors in an LCOS chip according to a preset amplitude;
after each increase, judging whether the intensity of the diffuse scattering light is preset intensity, if so, stopping increasing the intensity of the pixel points reflecting the light of the three primary colors in the LCOS chip;
if not, continuing to increase the intensity of the pixel point reflecting the light rays of the three primary colors in the LCOS chip by the preset amplitude.
7. The projector projection image display control method according to claim 6, wherein said analyzing to acquire the resolution of the projection screen comprises the steps of:
intercepting a sampling picture from the projection picture, and amplifying the sampling picture to a preset multiple;
performing edge recognition on the pixel points in the amplified sampling picture to obtain the pixel points in the sampling picture;
counting the number of pixel points in a sampling picture, and counting the length and width dimensions of the sampling picture;
the number of pixel points in a unit area is obtained and used as the resolution of a projection picture.
8. The method of claim 7, wherein the second adjusting the parameters of the liquid crystal molecules comprises the steps of:
in a unit area, increasing the number of pixel points which participate in reflecting light rays of three primary colors in the LCOS chip by the preset number;
after each increase, judging whether the resolution of the projection picture is larger than the preset resolution, if so, stopping increasing the number of pixels participating in reflecting the light rays of the three primary colors in the LCOS chip;
if not, the number of pixels participating in reflecting the light rays of the three primary colors in the LCOS chip is increased by the preset number.
9. A projector-projected-image display control system for implementing the projector-projected-image display control method according to any one of claims 1 to 8, comprising:
the angle correction module is used for correcting the projection angle according to the reflection condition of the laser from the projection screen;
the centering correction module is used for centering correction by using a four-point positioning method;
the image scaling module detects the position relation between the projection image and the projection screen and scales the projection image;
the display control module divides the white light into three primary colors of red, green and blue through the light splitting system, the three primary colors of light are irradiated onto the reflective LCOS chip, parameters of liquid crystal molecules on the LCOS chip are controlled, and the three primary colors of light reflected by the LCOS chip are converged in proportion to obtain projection light;
the intensity detection module judges whether the intensity of the diffuse scattered light is preset intensity or not;
the parameter control module is used for carrying out first adjustment on the parameters of the liquid crystal molecules and carrying out second adjustment on the parameters of the liquid crystal molecules;
and the resolution detection module is used for analyzing and acquiring the resolution of the projection picture.
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