CN110769232B - Brightness detection method, device and system of ultra-short focus projector - Google Patents
Brightness detection method, device and system of ultra-short focus projector Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3179—Video signal processing therefor
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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]
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Abstract
The embodiment of the invention relates to the technical field of projector brightness detection, and particularly discloses a brightness detection method, a device and a system for an ultra-short-focus projector. The method and the device utilize the position relation between the ultra-short-focus projector optical machine and the projection plane, obtain the brightness values of other detection points in a calculation mode after the illuminometer collects brightness information, not only can solve the problem of uneven brightness of a projection picture obtained by the illuminometer, but also can obtain the brightness values of any position in the projection picture, and are convenient to operate and easy to popularize.
Description
Technical Field
The invention relates to the technical field of projector brightness detection, in particular to a brightness detection method, a device and a system of an ultra-short-focus projector.
Background
When the brightness of the projection picture of the ultra-short focus projector to be detected is detected, it is found that because the projection angle of the ultra-short focus projector to be detected is large, the photosensitive surface of the illuminometer for measuring the brightness cannot completely receive the light source, but only the brightness of a local area in the photosensitive surface can be detected, so that the brightness detection cannot be performed on any position of the projection picture on the projection plane, and a measurement error exists in the brightness detection value.
Disclosure of Invention
In view of this, the luminance is obtained through a calculation method by using the spatial angular relationship, so that not only the problem that the luminance of the projection image obtained by the illuminometer is not uniform can be solved, but also the luminance of any position in the projection image can be obtained.
In order to solve the above technical problems, the technical solution provided by the present invention is a brightness detection method for an ultra-short-focus projector, the detection method comprising:
s11: controlling a detected ultra-short-focus projector to project a detection image to a projection plane, and adjusting the projection position of the detected ultra-short-focus projector so as to enable the lower edge position of the detection image on the projection plane to coincide with the preset lower edge detection position on the projection plane;
s12: controlling an illuminometer to acquire the brightness value of the lower edge position of the detection image on the projection plane;
s13: calculating the actual brightness value of the detection image during forward projection according to the brightness value of the lower edge position of the detection image on the projection plane;
s14: and calculating the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image during forward projection.
Preferably, the method of step S13 includes:
acquiring a vertical distance difference value between the lower edge position of the detection image on the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E-E according to the brightness value of the lower edge position of the detection image on the projection plane and the actual brightness value of the front projectionmin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe vertical distance difference between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected is obtained.
Preferably, the method of step S14 includes:
acquiring a vertical distance difference value between a brightness position to be detected of the detection image on the projection plane and an optical machine position of the ultrashort-focus projector to be detected;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E according to actual brightness value and measured brightness value of the detection image on the projection plane during forward projectionmCalculating a brightness value E of a brightness position to be measured of the detection image on the projection planemWherein, E is the actual brightness value of the detection image on the projection plane during the forward projection, and D is the projection plane and the optical position of the ultra-short-focus projector to be measuredAnd H is a vertical distance difference value between the brightness position to be detected of the detection image on the projection plane and the position of the ultra-short focus projector optical machine to be detected.
The invention also provides a brightness detection device of the ultra-short-focus projector, which is applied to a brightness detection system, the brightness detection system also comprises a measured ultra-short-focus projector and an illuminometer, the measured ultra-short-focus projector and the illuminometer are respectively communicated with the brightness detection device and controlled by the brightness detection device, the measured ultra-short-focus projector is placed at a preset position, the illuminometer is arranged at a preset lower edge detection position on a projection plane, and the brightness detection device comprises:
the projection control module is used for controlling the tested ultra-short focus projector to project a detection image to a projection plane and adjusting the projection position of the tested ultra-short focus projector so as to enable the lower edge position of the detection image on the projection plane to coincide with the preset lower edge detection position on the projection plane;
the acquisition control module is used for controlling the illuminometer to acquire the brightness value of the lower edge position of the detection image on the projection plane;
the first calculation module is used for calculating the actual brightness value of the detection image during forward projection according to the brightness value of the lower edge position of the detection image on the projection plane;
and the second calculation module is used for calculating the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image during forward projection.
Preferably, the first calculation module includes:
the first distance acquisition unit is used for acquiring a vertical distance difference value between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected;
the second distance acquisition unit is used for acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
a first calculation unit for calculating a lower side of the image based on the detection map on the projection planeThe luminance value along the position and the forward projection actual luminance value are calculated by the formula E ═ Emin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe vertical distance difference between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected is obtained.
Preferably, the second calculation module includes:
the third distance acquisition unit is used for acquiring a vertical distance difference value between the brightness position to be detected of the detection image on the projection plane and the optical machine position of the ultra-short focus projector to be detected;
the fourth distance acquisition unit is used for acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
a second calculating unit for calculating formula E according to the actual brightness value and the measured brightness value of the detection image on the projection plane during forward projectionmCalculating a brightness value E of a brightness position to be measured of the detection image on the projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the vertical distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected.
The invention also provides a brightness detection system of the ultra-short focus projector, which comprises a measured ultra-short focus projector, an illuminometer and a brightness detection device, wherein the measured ultra-short focus projector and the illuminometer are respectively communicated with the brightness detection device and controlled by the brightness detection device, the measured ultra-short focus projector is placed at a preset position, the illuminometer is placed at a preset lower edge detection position on a projection plane, wherein,
the brightness detection device controls the tested ultra-short-focus projector to project a detection image to a projection plane, and adjusts the projection position of the tested ultra-short-focus projector so that the lower edge position of the detection image on the projection plane coincides with the lower edge detection position preset on the projection plane;
the brightness detection device controls the illuminometer to collect the brightness value of the lower edge position of the detection image on the projection plane;
the brightness detection device calculates the actual brightness value of the detection image during front projection according to the brightness value of the lower edge position of the detection image on the projection plane;
the brightness detection device calculates the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image in the forward projection process.
Preferably, the method for calculating the actual brightness value of the detection map image in the front projection by the brightness detection device according to the brightness value of the lower edge position of the detection map image on the projection plane includes:
acquiring a vertical distance difference value between the lower edge position of the detection image on the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E-E according to the brightness value of the lower edge position of the detection image on the projection plane and the actual brightness value of the front projectionmin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe vertical distance difference between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected is obtained.
Preferably, the method for calculating the brightness value of the brightness position to be measured of the detection map image on the projection plane by the brightness detection device according to the actual brightness value of the detection map image in the front projection comprises the following steps:
acquiring a vertical distance difference value between a brightness position to be detected of a detection image on a projection plane and an optical machine position of an ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E according to actual brightness value and measured brightness value of detection image on projection plane during forward projectionmCalculating a brightness value E of a brightness position to be measured of the detection image on the projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the vertical distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected.
Compared with the prior art, the beneficial effects of the method are detailed as follows: according to the method and the device, the position relation between the ultra-short-focus projector optical machine and the projection plane is utilized, after the luminance information is collected by the illuminometer, the luminance values of other detection points are obtained in a calculation mode, the problem that the luminance of a projection picture obtained by the illuminometer is not uniform can be solved, and the luminance value of any position in the projection picture can be obtained.
Drawings
In order to illustrate the embodiments of the present invention more clearly, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained by those skilled in the art without inventive effort.
Fig. 1 is a schematic diagram illustrating a method for detecting brightness of an ultra-short focus projector according to an embodiment of the present invention;
fig. 2 is a schematic flowchart illustrating a brightness detection method of an ultra-short focus projector according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a brightness detection apparatus of an ultra-short focus projector according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a brightness detection system of an ultra-short focus projector according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative work belong to the protection scope of the present invention.
In order to make the technical solutions of the present invention better understood by those skilled in the art, the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
The inventive principle of the present application illustrates: as shown in figure 1, the left graph in the graph is the spatial position relation when the ultrashort-focus projector is normally used, MIN and MAX light rays capable of displaying the picture exist according to the display range of the projection picture, any point position A is selected in the range, the A point light sensitivity degree is amplified, if the right graph is displayed, the incident light rays can be found not to cover the light sensitive ball of the whole illuminometer, namely, the illuminometer uses partial light sensitive surface to replace the whole light sensitive surface, the measuring error can be inevitably existed, meanwhile, the invalid light sensitive range is arranged on the light sensitive probe of the illuminometer, namely, the interference of the external environment light is received, and the error of the whole system can be increased. Based on the method, the spatial position relation of the ultra-short focus projector to be detected is obtained, and the actual photosensitive angle of the point A is calculated; then, the brightness information during the forward projection can be calculated according to the brightness information actually measured by the illuminometer, and the measured brightness value of any point in the projection picture can be solved according to the brightness information during the forward projection.
Aiming at the solving method of the brightness value of the position of the A point, the derivation method comprises the following steps: (1) when the point A is detected, according to the spatial angle relationship, it can be known that tgA is H/D, H is the height value from the optical machine position of the ultrashort focal projector to be detected to the point A, D is the distance value from the ultrashort focal projector to be detected to the projection plane, (2) the angle of the point A is A arctg (H/D), (3) the brightness value obtained by the illuminometer for the point A is assumed to be Ea; then Ea is E A/180, where E is the brightness value when the incident light is projected, and E is Ea 180/A when the incident light is projected; (4) after (2) and (3) are combined, it can be found that E ═ Ea × 180/(arctg (H/D)), (5) since the point a is arbitrarily selected, but the range of a is between MIN and MAX, it needs to be between the distance Hmin and Hmax corresponding to MIN and MAX, which corresponds to the values of Emin and Emax, and (6) since the height value between MIN and MAX can be measured, the brightness value of any other point in the whole projection screen can be obtained.
Specifically, as shown in fig. 2, an embodiment of the present invention provides a brightness detection method for an ultra-short focus projector, which can be applied to a brightness detection device, that is, a brightness detection control device, where the brightness detection method includes:
s11: and controlling the measured ultra-short-focus projector to project a detection image to the projection plane, and adjusting the projection position of the measured ultra-short-focus projector so as to enable the lower edge position of the detection image on the projection plane to coincide with the preset lower edge detection position on the projection plane.
Specifically, the ultra-short focus projector to be tested can be controlled to project a detection image to the projection plane by sending an image projection command to the ultra-short focus projector to be tested, and the detection image is preset. In addition, a lower edge detection position is arranged on the projection plane, and can be a marking line or other marking information. After the ultrashort-focus projector to be measured projects the detection image, the projection position of the ultrashort-focus projector to be measured is adjusted in a mode of manual adjustment by an operator, a camera can also be used for photographing for image recognition, the position of a projection picture of the ultrashort-focus projector to be measured is automatically adjusted, and the lower edge of the projection picture is adjusted to be coincident with the position of the preset lower edge of the projection plane.
S12: and controlling the illuminometer to acquire the brightness value of the lower edge position of the detection image on the projection plane.
Specifically, can send luminance collection command to the illuminometer, control the illuminometer and gather the luminance value at detection map image lower limb on the projection plane, can place the illuminometer and detect the luminance value that map image lower limb position can be gathered in the preset lower limb detection position of projection plane.
S13: and calculating the actual brightness value of the detection image in the front projection according to the brightness value of the lower edge position of the detection image on the projection plane.
Specifically, the method of step S13 includes:
acquiring a vertical distance difference value between the lower edge position of a detection image on a projection plane and the position of an optical machine of the ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between a projection plane and the position of an optical machine of the ultra-short focus projector to be detected;
according to the brightness value of the lower edge position of the detection image on the projection plane and the actual forward projection brightness value, calculating a formula: e ═ Emin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe vertical distance difference between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected is obtained.
Specifically, the vertical distance difference between the lower edge position of the detection image on the projection plane and the optical machine position of the ultra-short-focus projector to be detected and the horizontal distance difference between the projection plane and the optical machine position of the ultra-short-focus projector to be detected are fixed values, so that the vertical distance difference and the horizontal distance difference can be stored after measurement in advance and can be directly read during calculation.
S14: and calculating the brightness value of the brightness position to be measured of the detection image on the projection plane according to the actual brightness value of the detection image in the front projection process.
Specifically, the method of step S14 includes:
acquiring a vertical distance difference value between a brightness position to be detected of a detection image on a projection plane and an optical machine position of an ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between a projection plane and the position of an optical machine of the ultra-short focus projector to be detected;
calculating a formula according to an actual brightness value and a measured brightness value of a detection image on a projection plane during forward projection: emCalculating a brightness value E of a brightness position to be measured of the detection image on the projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the vertical distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected.
Specifically, the vertical distance difference between the brightness position to be measured of the detection image on the projection plane and the optical machine position of the ultrashort-focus projector to be measured and the horizontal distance difference between the projection plane and the optical machine position of the ultrashort-focus projector to be measured are fixed values, so that the vertical distance difference and the horizontal distance difference can be stored after measurement in advance, and the vertical distance difference and the horizontal distance difference can be directly read in calculation.
As shown in fig. 3, an embodiment of the present invention provides a brightness detection apparatus for an ultra-short focus projector, which is applied to a brightness detection system, the brightness detection system further includes a measured ultra-short focus projector and an illuminometer, the measured ultra-short focus projector and the illuminometer are respectively in communication with the brightness detection apparatus and are controlled by the brightness detection apparatus, the measured ultra-short focus projector is placed at a preset position, and the illuminometer is placed at a preset lower edge detection position on a projection plane, where the brightness detection apparatus includes:
the projection control module 21 is configured to control the ultra-short focus projector to project the detection image to the projection plane, and adjust the projection position of the ultra-short focus projector to make the lower edge position of the detection image on the projection plane coincide with a preset lower edge detection position on the projection plane;
the acquisition control module 22 is used for controlling the illuminometer to acquire the brightness value of the lower edge position of the detection image on the projection plane;
the first calculation module 23 is configured to calculate an actual brightness value of the detection map image in the forward projection process according to the brightness value of the lower edge position of the detection map image on the projection plane;
and the second calculating module 24 is configured to calculate a brightness value of a to-be-detected brightness position of the detection map image on the projection plane according to an actual brightness value of the detection map image during forward projection.
Specifically, the first calculation module includes:
the first distance acquisition unit is used for acquiring a vertical distance difference value between the lower edge position of the detection image on the projection plane and the position of the ultra-short focus projector optical machine to be detected;
the second distance acquisition unit is used for acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
the first calculation unit is used for calculating a formula according to the brightness value of the lower edge position of the detection image on the projection plane and the forward projection actual brightness value: e ═ Emin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe vertical distance difference between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected is obtained.
Specifically, the second calculation module includes:
the third distance acquisition unit is used for acquiring a vertical distance difference value between the brightness position to be detected of the detection image on the projection plane and the optical machine position of the ultra-short focus projector to be detected;
the fourth distance acquisition unit is used for acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
a second calculating unit, configured to calculate a formula according to an actual luminance value and a measured luminance value of the detection map image on the projection plane when the projection is being projected: emCalculating a brightness value E of a brightness position to be measured of the detection image on the projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the vertical distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected.
As shown in fig. 4, an embodiment of the present invention further provides a brightness detection system for an ultra-short focus projector, which includes a measured ultra-short focus projector, an illuminometer and a brightness detection device, wherein the measured ultra-short focus projector and the illuminometer are respectively in communication with the brightness detection device and controlled by the brightness detection device, the measured ultra-short focus projector is placed at a preset position, and the illuminometer is placed at a preset lower edge detection position on a projection plane, wherein,
the brightness detection device controls the tested ultra-short-focus projector to project a detection image to the projection plane, and adjusts the projection position of the tested ultra-short-focus projector so as to enable the lower edge position of the detection image on the projection plane to coincide with the preset lower edge detection position on the projection plane;
the brightness detection device controls the illuminometer to collect the brightness value of the lower edge position of the detection image on the projection plane;
the brightness detection device calculates the actual brightness value of the detection image during front projection according to the brightness value of the lower edge position of the detection image on the projection plane;
the brightness detection device calculates the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image in the front projection process.
Specifically, the method for calculating the actual brightness value of the detection image in the front projection by the brightness detection device according to the brightness value of the lower edge position of the detection image on the projection plane comprises the following steps:
acquiring a vertical distance difference value between the lower edge position of a detection image on a projection plane and the position of an optical machine of the ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between a projection plane and the position of an optical machine of the ultra-short focus projector to be detected;
according to the brightness value of the lower edge position of the detection image on the projection plane and the actual forward projection brightness value, calculating a formula: e ═ Emin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminFor detecting the lower edge of the image on the projection planeAnd the vertical distance difference between the position and the optical machine position of the ultra-short focus projector to be measured.
Specifically, the method for calculating the brightness value of the brightness position to be measured of the detection map image on the projection plane by the brightness detection device according to the actual brightness value of the detection map image in the front projection process includes:
acquiring a vertical distance difference value between a brightness position to be detected of a detection image on a projection plane and an optical machine position of an ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between a projection plane and the position of an optical machine of the ultra-short focus projector to be detected;
calculating a formula according to an actual brightness value and a measured brightness value of a detection image on a projection plane during forward projection: emCalculating a brightness value E of a brightness position to be measured of the detection image on the projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the vertical distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected.
The description of the features in the embodiments corresponding to fig. 3 and fig. 4 may refer to the related description of the embodiment corresponding to fig. 2, and is not repeated here.
The brightness detection method, the brightness detection device and the brightness detection system of the ultra-short-focus projector provided by the embodiment of the invention are described in detail above. The embodiments are described in a progressive manner in the specification, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. A software module may reside in Random Access Memory (RAM), memory, Read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
Claims (9)
1. A brightness detection method of an ultra-short-focus projector is characterized by comprising the following steps:
s11: controlling a detected ultra-short-focus projector to project a detection image to a projection plane, and adjusting the projection position of the detected ultra-short-focus projector so as to enable the lower edge position of the detection image on the projection plane to coincide with the preset lower edge detection position on the projection plane;
s12: controlling an illuminometer to acquire the brightness value of the lower edge position of the detection image on the projection plane;
s13: calculating the actual brightness value of the detection image during forward projection according to the brightness value of the lower edge position of the detection image on the projection plane;
s14: and calculating the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image during forward projection.
2. The brightness detection method of the ultra-short focus projector according to claim 1, wherein the method of step S13 comprises:
acquiring a distance difference value between the lower edge position of the detection image on the projection plane and the optical machine position of the ultra-short-focus projector to be detected in the vertical direction;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E = E according to the brightness value of the lower edge position of the detection image on the projection plane and the actual brightness value of the front projectionmin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe distance difference value between the lower edge position of the detection image on the projection plane and the optical machine position of the ultra-short-focus projector to be detected in the vertical direction is obtained.
3. The brightness detection method of the ultra-short focus projector according to claim 2, wherein the method of step S14 comprises:
acquiring a distance difference value between the brightness position to be detected of the detection image on the projection plane and the optical machine position of the ultra-short focus projector to be detected in the vertical direction;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E according to actual brightness value and measured brightness value of the detection image on the projection plane during forward projectionmCalculating brightness value E of brightness position to be measured of detection image on projection planemWherein, E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference between the projection plane and the optical machine position of the ultra-short-focus projector to be detected, and H is the distance difference between the brightness position to be detected of the detection image on the projection plane and the optical machine position of the ultra-short-focus projector to be detected in the vertical directionThe value is obtained.
4. The utility model provides a luminance detection device of ultrashort burnt projecting apparatus, its characterized in that is applied to luminance detection system, luminance detection system still includes surveyed ultrashort burnt projecting apparatus and illuminometer, surveyed ultrashort burnt projecting apparatus with the illuminometer respectively with luminance detection device establishes communication and by luminance detection device control, surveyed ultrashort burnt projecting apparatus places and predetermines the position, the lower border detection position of predetermineeing on the projection plane is settled to the illuminometer, luminance detection device includes:
the projection control module is used for controlling the tested ultra-short focus projector to project a detection image to a projection plane and adjusting the projection position of the tested ultra-short focus projector so as to enable the lower edge position of the detection image on the projection plane to coincide with the preset lower edge detection position on the projection plane;
the acquisition control module is used for controlling the illuminometer to acquire the brightness value of the lower edge position of the detection image on the projection plane;
the first calculation module is used for calculating the actual brightness value of the detection image during forward projection according to the brightness value of the lower edge position of the detection image on the projection plane;
and the second calculation module is used for calculating the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image during forward projection.
5. The apparatus of claim 4, wherein the first calculating means comprises:
the first distance acquisition unit is used for acquiring a distance difference value between the lower edge position of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected in the vertical direction;
the second distance acquisition unit is used for acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
a first computing unit for computing the first time according to the projectionThe brightness value of the lower edge position of the detection image on the shadow plane and the forward projection actual brightness value are calculated by the formula E = Emin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminThe distance difference value between the lower edge position of the detection image on the projection plane and the optical machine position of the ultra-short-focus projector to be detected in the vertical direction is obtained.
6. The apparatus of claim 5, wherein the second calculating means comprises:
the third distance acquisition unit is used for acquiring a distance difference value between the brightness position to be detected of the detection image on the projection plane and the optical machine position of the ultra-short-focus projector to be detected in the vertical direction;
the fourth distance acquisition unit is used for acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
a second calculating unit for calculating formula E according to the actual brightness value and the measured brightness value of the detection image on the projection plane during forward projectionmCalculating brightness value E of brightness position to be measured of detection image on projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected in the vertical direction.
7. The brightness detection system of the ultra-short-focus projector is characterized by comprising an ultra-short-focus projector to be detected, an illuminometer and a brightness detection device, wherein the ultra-short-focus projector to be detected and the illuminometer are respectively communicated with the brightness detection device and controlled by the brightness detection device, the ultra-short-focus projector to be detected is placed at a preset position, the illuminometer is arranged at a preset lower edge detection position on a projection plane, wherein,
the brightness detection device controls the tested ultra-short-focus projector to project a detection image to a projection plane, and adjusts the projection position of the tested ultra-short-focus projector so that the lower edge position of the detection image on the projection plane coincides with the lower edge detection position preset on the projection plane;
the brightness detection device controls the illuminometer to collect the brightness value of the lower edge position of the detection image on the projection plane;
the brightness detection device calculates the actual brightness value of the detection image during front projection according to the brightness value of the lower edge position of the detection image on the projection plane;
the brightness detection device calculates the brightness value of the brightness position to be detected of the detection image on the projection plane according to the actual brightness value of the detection image in the forward projection process.
8. The brightness detection system of the ultra-short focus projector as claimed in claim 7, wherein the method for calculating the actual brightness value of the detection map image at the time of front projection from the brightness value of the detection map image at the lower edge position on the projection plane by the brightness detection means comprises:
acquiring a vertical distance difference value between the lower edge position of the detection image on the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E = E according to the brightness value of the lower edge position of the detection image on the projection plane and the actual brightness value of the front projectionmin*180/(arg(D/Hmin) Calculate the actual brightness value E of the detection map image on the projection plane at the time of front projection, wherein EminThe brightness value of the lower edge position of the detection image on the projection plane, D is the horizontal distance difference value of the projection plane and the optical machine position of the ultra-short focus projector to be detected, HminFor detecting the position of the lower edge of the image on the projection planeAnd the distance difference value of the optical machine position of the ultra-short focus projector to be measured in the vertical direction.
9. The system for detecting brightness of an ultra-short focus projector as claimed in claim 8, wherein the method for calculating the brightness value of the brightness position to be measured of the detection map image on the projection plane according to the actual brightness value of the detection map image at the time of front projection by the brightness detection device comprises:
acquiring a vertical distance difference value between a brightness position to be detected of a detection image on a projection plane and an optical machine position of an ultra-short focus projector to be detected;
acquiring a horizontal distance difference value between the projection plane and the position of the optical machine of the ultra-short focus projector to be detected;
calculating formula E according to actual brightness value and measured brightness value of detection image on projection plane during forward projectionmCalculating brightness value E of brightness position to be measured of detection image on projection planemAnd E is the actual brightness value of the detection image on the projection plane during front projection, D is the horizontal distance difference value between the projection plane and the position of the ultra-short-focus projector optical machine to be detected, and H is the distance difference value between the position of the brightness to be detected of the detection image on the projection plane and the position of the ultra-short-focus projector optical machine to be detected in the vertical direction.
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