CN111935469B - Projector safe working method and projector - Google Patents
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- CN111935469B CN111935469B CN202011030662.5A CN202011030662A CN111935469B CN 111935469 B CN111935469 B CN 111935469B CN 202011030662 A CN202011030662 A CN 202011030662A CN 111935469 B CN111935469 B CN 111935469B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- 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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Abstract
The invention discloses a projector safe working method and a projector, wherein the projector safe working method comprises the following steps: acquiring a projection image of a shielding object in a projection area imaged by an optical machine when the projector works; acquiring an area A1 of the projected image in the first risk zone, a weight coefficient a of the first risk zone, an area B1 of the projected image in the second risk zone, and a weight coefficient B of the second risk zone; acquiring the shielding rate M of the shielding object according to the area A1 of the first risk zone, the weight coefficient a of the first risk zone, the area B1 of the second risk zone, the weight coefficient B of the second risk zone and the total area F of the projection zone; wherein a is greater than or equal to b; and determining that the shielding rate M of the shielding object is greater than or equal to the preset shielding rate E, and turning off the light source of the optical machine. The technical scheme of the invention is beneficial to improving the use safety of the projector.
Description
Technical Field
The invention relates to the technical field of projectors, in particular to a safe working method of a projector and the projector.
Background
Along with the improvement of living standard of people, people also use more and more projectors. Most projector optical machines are instruments using strong light sources, the illumination of the light sources is high, the temperature is high during use, and particularly, some optical machines with high power and high brightness are used. When the fire is shielded by dark inflammable, the temperature in the irradiated area of the inflammable is easy to exceed the ignition point, and a fire is caused.
Disclosure of Invention
The invention mainly aims to provide a safe working method of a projector, aiming at improving the use safety of the projector.
In order to achieve the above object, the projector according to the present invention includes an optical engine, and a projection area N imaged by the optical engine includes a first risk area a and a second risk area B, where the first risk area is disposed around the optical engine at a center of the projection area, the second risk area includes a remaining area of the projection area, and an area of the projection area N is F;
the safe working method of the projector comprises the following steps:
acquiring a projection image P of a barrier in a projection area imaged by an optical machine when the projector works;
acquiring an area A1 of the projection image in the first risk area, a weight coefficient a of the first risk area, an area B1 of the projection image in the second risk area, and a weight coefficient B of the second risk area;
acquiring the shielding rate M of the shielding object according to the area A1 of the first risk area, the weight coefficient a of the first risk area, the area B1 of the second risk area, the weight coefficient B of the second risk area and the total area F of the projection area; wherein a is greater than or equal to b;
and determining that the shielding rate M of the shielding object is greater than or equal to the preset shielding rate E, and turning off the light source of the optical machine.
Optionally, the obtaining of the shielding rate M of the shielding object according to the area a1 of the first risk region, the weight coefficient a of the first risk region, the area B1 of the second risk region, the weight coefficient B of the second risk region, and the total area F of the projection region is as follows:
M=（aA1+bB1）/F。
optionally, the first risk area a is a circle, a circle center of the first risk area a is a center of the optical engine in the projection area, and a circumference of the first risk area a is tangent to a side line of the projection area.
Optionally, the area a1 of the first risk region includes a third risk region C and a fourth risk region D, wherein the third risk region is disposed around the light engine in the center of the projection region, and the fourth risk region includes the remaining region of the first risk region;
the step of obtaining the shielding rate M of the shielding object according to the area A1 of the first risk area, the weight coefficient a of the first risk area, the area B1 of the second risk area, the weight coefficient B of the second risk area and the total area F of the projection area comprises the following steps:
acquiring the area C1 and the third weight coefficient C of the projected image in the third risk region, and the area D1 and the fourth weight coefficient D of the projected image in the fourth risk region; wherein c is greater than or equal to d, d is greater than or equal to b;
the method for obtaining the shielding rate M of the shielding object comprises the following steps:
M=（dD1+cC1+bB1）/F。
optionally, the third risk area C is a circle, a center of the circle is a center of the optical machine in the projection area, and a circumferential radius of the third risk area is half of a circumferential radius of the first risk area a.
Optionally, before the step of turning off the light source of the light engine, the method further includes:
obtaining the maintaining time length that the shielding rate M of the shielding object is greater than or equal to the preset shielding rate E;
and when the maintaining time length is determined to be greater than or equal to the preset time length, the light source of the optical machine is turned off.
Optionally, before the step of turning off the light source of the optical machine, determining that the duration of the maintenance is greater than or equal to a preset duration, the step of turning off the light source of the optical machine further includes:
obtaining a comparison difference value between the shielding rate M of the shielding object and a preset shielding rate E;
and acquiring the preset time length according to the comparison difference, wherein the size of the comparison difference is inversely related to the length of the preset time length.
Optionally, the step of obtaining the preset duration according to the comparison difference includes:
acquiring a mapping table between the comparison difference and a preset time length;
and acquiring corresponding preset time length from the mapping table according to the comparison difference.
Optionally, the step of obtaining the projection image of the blocking object in the projection area imaged by the optical machine when the projector is in operation includes:
the image acquisition device is arranged close to the optical machine, the position of an image acquisition area of the image acquisition device is adjusted so that the image acquisition area covers a projection area of the optical machine, and an image of the projection area is acquired through the image acquisition device;
and acquiring a projection image of the obstruction in the projection area according to the image of the projection area.
The present invention also provides a projector, including: the projector safety working method comprises the following steps of:
acquiring a projection image P of a barrier in a projection area imaged by an optical machine when the projector works;
acquiring an area A1 of the projection image in the first risk area, a weight coefficient a of the first risk area, an area B1 of the projection image in the second risk area, and a weight coefficient B of the second risk area;
acquiring the shielding rate M of the shielding object according to the area A1 of the first risk area, the weight coefficient a of the first risk area, the area B1 of the second risk area, the weight coefficient B of the second risk area and the total area F of the projection area; wherein a is greater than or equal to b;
and determining that the shielding rate M of the shielding object is greater than or equal to the preset shielding rate E, and turning off the light source of the optical machine.
In the technical scheme of the invention, a projection area N for imaging by an optical machine is set to comprise a first risk area A and a second risk area B, wherein the first risk area is arranged around the central position of the optical machine in the projection area, the second risk area comprises the rest area of the projection area, and the area of the projection area N is F; firstly, acquiring a projection image P of a barrier in a projection area imaged by an optical machine when the projector works; then obtaining the area A1 of the projection image in the first risk area, the weight coefficient a of the first risk area, the area B1 of the second risk area and the weight coefficient B of the second risk area; then obtaining the shielding rate M of the shielding object according to the area A1 of the first risk area, the weight coefficient a of the first risk area, the area B1 of the second risk area, the weight coefficient B of the second risk area and the total area F of the projection area; wherein a is greater than b; and then determining that the shielding rate M of the shielding object is greater than or equal to the preset shielding rate E, and turning off the light source of the optical machine, so that the shielding object can be ignited at high temperature when the effective area shielded by the shielding object is greater than the preset area, and the light source of the optical machine is turned off in time to avoid the shielding object from being ignited, thereby enabling the use of the projector to be safe and reliable, and being beneficial to the use of the projector by a user.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for safely operating a projector according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a projector according to an embodiment of the invention;
FIG. 3 is a schematic view of the working principle of the projector according to the present invention without a shielding in front of the carriage;
FIG. 4 is a schematic diagram of the working principle of the projector according to the present invention under the condition that a shielding object is in front of the optical engine;
FIG. 5 is a schematic view of an embodiment of a projection area of a projector according to the present invention with a mask in front of the carriage;
FIG. 6 is a schematic view of another embodiment of a projection area of the projector according to the present invention with a shield in front of the carriage;
fig. 7 is a schematic circuit diagram of a projector according to an embodiment of the invention.
The reference numbers illustrate:
10 projector, 20 barrier;
100 master control circuits and 200 optical machines;
300 camera, 510 speaker;
520 indicator light, 600 memory;
700 temperature sensor, 800 timer;
900 distance sensor, a first risk area;
b, a second risk area and C, a third risk area;
d, a fourth risk area and an N projection area;
p projects an image.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.
In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, "and/or" in the whole text includes three schemes, taking a and/or B as an example, including a technical scheme, and a technical scheme that a and B meet simultaneously; in addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention mainly provides a safe working method of a projector, which is mainly applied to the projector 10 to improve the safety of the use of the projector 10.
The following will mainly describe the details of the safe operation method of the projector.
Referring to fig. 1 to 7, in the embodiment of the present invention, the projector 10 includes an optical engine 200, and a projection area N imaged by the optical engine 200 includes a first risk area a and a second risk area B, where the first risk area a is disposed around the optical engine 200 at a central position of the projection area, the second risk area B includes a remaining area of the projection area N, and an area of the projection area N is F;
the safe working method of the projector comprises the following steps:
s10, acquiring a projection image P of the projection area N imaged by the mask 20 in the optical engine 200 when the projector 10 is in operation;
s20, acquiring an area A1 of the projection image P in the first risk area A, a weight coefficient a of the first risk area A, an area B1 of the projection image P in the second risk area B, and a weight coefficient B of the projection image P in the second risk area B;
s30, acquiring the shielding rate M of the shielding object 20 according to the area A1 of the first risk area A, the weight coefficient a of the first risk area A, the area B1 of the second risk area B, the weight coefficient B of the second risk area B and the total area F of the projection area N; wherein a is greater than b;
and determining that the shielding rate M of the shielding object 20 is greater than or equal to the preset shielding rate E, and turning off the light source of the optical machine 200.
Specifically, in the present embodiment, when the projector 10 is in operation, a projection area N imaged by the optical engine 200 is formed on a wall or a curtain, and the content to be played by the projector 10 is displayed in the projection area N. The shape of the projection area N may be various, such as rectangular, square, and circular. Taking the shape of the projection area N as a rectangle as an example, the projection area N is divided into a first risk area a and a second risk area B, and the first risk area a covers the central position of the optical engine 200 in the projection area, so that the temperature of the first risk area a is higher than that of the second risk area B. The shape of the first risk area a may be many, such as circular, square, triangular, etc., and is exemplified by a circle. There are many ways to obtain the shape of the projection area and the way in which the obstruction 20 projects the image P, such as by an image capture device. The image acquisition device is arranged close to the optical machine 200, the position of the image acquisition region of the image acquisition device is adjusted so that the image acquisition region covers the projection region N of the optical machine 200, the projection image P of the barrier 20 in the projection region N is acquired through the image acquisition device, and the position of the projection image P in the projection region N and the area covering the projection region N are obtained. Therefore, the image acquisition device can completely acquire the projection image P of the projection area N, and the accuracy of acquiring the projection image P is improved. The image acquisition device may include a camera device 300, and the camera device 300 performs shooting, analyzes the shot image, and confirms the shape of the projection region N, the position of the projection image P in the projection region N, and the area covering the projection region N. Of course, in some embodiments, the detection may be performed by a light sensor, a plurality of light sensors may be disposed to cover the projection area N, and the shape, area and position of the projected image P may be determined according to the light intensity sensed by each light sensor.
The following describes an embodiment of the method for acquiring the projected image P by image processing.
And the camera captures the image in the projection area N for identification. The process of identifying the projected image P is as follows: firstly, a gray image is captured from a camera, and then Gaussian filtering is carried out on the gray image. And processing the gray level image after Gaussian filtering to obtain a gray level histogram, extracting a threshold value, and then performing binarization processing. And finally, extracting the contour of the binarized image. Thereby obtaining the contour of the projected image P.
After the projection image P of the projection area N is determined, the area a1 of the projection image P in the first risk area a, the weight coefficient a of the first risk area a, and the area B1 of the projection image P in the second risk area B, the weight coefficient B of the second risk area B are obtained. An area a1 of the projected image P in the first risk region a and an area B1 of the projected image P in the second risk region B are determined according to the position of the projected image P in the projection region N. The position, shape and total area of the projected image P compared with the projected area N are determined, and the parts of the projected image P located in the first risk area a and the second risk area B are determined according to the position of the projected image P, so as to obtain the area a1 of the projected image P in the first risk area a and the area B1 of the projected image P in the second risk area B, respectively.
Acquiring the shielding rate M of the shielding object 20 according to the area A1 of the first risk area A, the weight coefficient a of the first risk area A, the area B1 of the second risk area B, the weight coefficient B of the second risk area B and the total area F of the projection area N; wherein a is greater than or equal to b; the shielding rate M of the shelter 20 can be obtained in many ways, such as by formula calculation, and can also be obtained by a more pre-stored mapping table, wherein the mapping table is a mapping table between M and A1, a, B1, B, and F. Overall, the larger the area a1 of the first risk zone a and the area B1 of the second risk zone B, the greater the occlusion rate M and the greater the risk; since the weight coefficient a of the first risk region a is greater than the weight coefficient B of the second risk region B, the larger the area a1 of the first risk region a (the closer the projected image P is to the middle position of the projection region N), the larger the occlusion rate M; of course, the larger the total area F is, the less the total area F is easily shielded, and the smaller the shielding rate M is; that is, M is inversely related to F, and M is positively related to A1, a, B1, B.
After the occlusion rate M is obtained, it is compared with a preset occlusion rate E. And determining that the shielding rate M of the shielding object 20 is greater than or equal to the preset shielding rate E, and turning off the light source of the optical machine 200. At this time, the area covered by the shelter 20 is beyond the range allowed by the preset safe operation, and the power of the optical engine 200 needs to be turned off. Determining that the shielding rate M of the shielding object 20 is smaller than the preset shielding rate E, which indicates that the shielding ratio is within the range allowed by the safe operation, and temporarily not turning off the light source. The preset shielding rate can be 20% -50%, when the preset shielding rate is lower, the set safety factor is higher, and when the shielding object 20 exists, the power supply is easily turned off, so that the lowest preset shielding rate is set to be 20%, and if the preset shielding rate is lower, the normal use of a user is influenced. When the preset shielding rate is higher, the set safety factor is lower, and when the shielding object 20 exists, safety accidents are easy to happen, so that the highest preset shielding rate is set to be 50%, and if the preset shielding rate is higher, potential safety hazards exist, and the safe use of a user is not facilitated.
In this embodiment, the projection region N imaged by the optical engine 200 is set to include a first risk region a and a second risk region B, where the first risk region a is set around the optical engine 200 at the center of the projection region, the second risk region B includes the remaining region of the projection region N, and the area of the projection region N is F; firstly, acquiring a projection image P of a projection area N imaged by a barrier 20 in an optical machine 200 when a projector 10 works; then obtaining the area A1 of the projection image P in the first risk area A, the weight coefficient a of the first risk area A, and the area B1 of the projection image P in the second risk area B, and the weight coefficient B of the projection image P in the second risk area B; then obtaining the shielding rate M of the shielding object 20 according to the area A1 of the first risk area A, the weight coefficient a of the first risk area A, the area B1 of the second risk area B, the weight coefficient B of the second risk area B and the total area F of the projection area N; wherein a is greater than b; then, it is determined that the shielding rate M of the shielding object 20 is greater than or equal to the preset shielding rate E, and the light source of the optical machine 200 is turned off, so that when the effective area shielded by the shielding object 20 is greater than the preset area, the shielding object 20 may be ignited at a high temperature, the light source of the optical machine 200 is turned off in time, and the shielding object 20 is prevented from being ignited, so that the use of the projector 10 becomes safe and reliable, and the use of the projector 10 by a user is facilitated.
In some embodiments, for more accurately calculating the occlusion rate M, the occlusion rate M of the occlusion object 20 is obtained according to the area a1 of the first risk zone a, the weight coefficient a of the first risk zone a, the area B1 of the second risk zone B, the weight coefficient B of the second risk zone B, and the total area F of the projection zone N by: m = (aA 1+ bB 1)/F.
Specifically, in the present embodiment, the product of the area a1 of the first risk region a and the weight coefficient a of the first risk region a is the effective area or equivalent area of the projected image P of the shutter 20 in the first risk region a. Wherein, the weight coefficient a of the first risk area A can be 0.7-1.8. The product of the area B1 of the second risk region B and the weighting factor B of the second risk region B is the effective or equivalent area of the projected image P of the obstruction 20 in the second risk region B. Wherein, the weight coefficient B of the second risk area B can be 0.4-0.7. The shielding rate M is obtained by firstly calculating the equivalent area of the projection image P in the projection region N and then dividing the equivalent area by the total area of the projection region N.
In some embodiments, in order to improve the accuracy of the equivalent area of the projection image P as much as possible, the first risk area a is a circle whose center is the center of the optical engine 200 in the projection area, and the circumference of the first risk area a is tangent to the side line of the projection area N. In this embodiment, the optical engine 200 is located at the center of the projection area as a circle center, and the radius extends to the side line of the projection area. Therefore, the first risk area A scientifically contains the part with higher temperature on the projection area N, and a higher weight coefficient is given to the area, so that the accuracy of the equivalent area is improved. Taking the shape of the projection area N as a rectangle as an example, the center of the optical machine 200 in the projection area N is the intersection of two diagonal lines of the rectangle, the circle of the first risk area a is tangent to the long side of the rectangle, and the area of the rectangle excluding the circle is the second risk area B.
In some embodiments, in order to further improve the calculation accuracy of the equivalent area to improve the calculation progress of the occlusion rate, the area a1 of the first risk region a includes a third risk region C and a fourth risk region D, wherein the third risk region C is disposed around the optical engine 200 at the center of the projection region, and the fourth risk region D includes the remaining region of the first risk region a;
the step of obtaining the occlusion rate M of the obstruction 20 according to the area A1 of the first risk zone A, the weight coefficient a of the first risk zone A, the area B1 of the second risk zone B, the weight coefficient B of the second risk zone B, and the total area F of the projection zone N includes:
acquiring an area C1 and a third weight coefficient C of the projected image P in the third risk region C, and an area D1 and a fourth weight coefficient D of the projected image P in the fourth risk region D; wherein c is greater than or equal to d, d is greater than or equal to b; the manner of obtaining the shielding rate M of the shielding object 20 is: m = (dD 1+ cC1+ bB 1)/F.
Specifically, in this embodiment, the first risk area a is divided into two areas, namely a third risk area C and a fourth risk area D, where the third risk area C includes the center of the optical engine 200 in the projection area. It should be noted that, in other embodiments, in order to obtain higher accuracy, the first risk area a or the second risk area B may be divided into more areas, such as a fifth risk area, a sixth risk area, and so on, and different areas have different weight coefficients, and the closer the distance from the optical engine 200 to the center of the projection area, the higher the weight coefficient is, and the farther the distance is, the lower the weight coefficient is.
The product of the area C1 of the third risk zone C and the weight coefficient C of the third risk zone C is the effective or equivalent area of the projected image P of the obstruction 20 in the third risk zone C. The weight coefficient C of the third risk area C may be 1.2-1.8, for example, 1.5. The product of the area D1 of the fourth risk region D and the weighting factor D of the fourth risk region D is the effective area or equivalent area of the projected image P of the obstruction 20 in the fourth risk region D. The weight coefficient D of the fourth risk area D may be 0.7-1.2, taking 1 as an example. The shielding rate M is obtained by firstly calculating the equivalent area of the projection image P in the projection region N and then dividing the equivalent area by the total area of the projection region N. As an example of calculation, M = (1 × D1+1.5 × C1+0.5 × B1)/F.
In some embodiments, in order to improve the accuracy of the equivalent area of the projected image P as much as possible, the third risk region C is a circle whose center is the center of the optical engine 200 in the projection region, and the circumference radius of the third risk region C is half of the circumference radius of the first risk region a. In this embodiment, the optical engine 200 is centered on the projection area, and one half of the circumferential radius of the first risk area a is used as the radius. In this way, the third risk region C scientifically divides the high-temperature part of the projection region N, and gives a high weight coefficient to this region, which is beneficial to improving the accuracy of the equivalent area. Taking the shape of the projection area N as a rectangle as an example, the center of the optical machine 200 in the projection area N is the intersection of two diagonal lines of the rectangle, the circle of the third risk area C is located in the middle of the circle of the fourth risk area D, and the edge of the fourth risk area D coincides with the edge of the first risk area a.
In some embodiments, in order to minimize the influence on the user, and improve the accuracy and the practicability of the determination, before the step of turning off the light source of the optical machine 200, the method further includes: acquiring the maintaining time length that the shielding rate M of the shielding object 20 is greater than or equal to the preset shielding rate E; and when the maintaining time length is determined to be greater than or equal to the preset time length, the light source of the optical machine 200 is turned off. In this embodiment, if the time for the shielding object 20 to shield the optical machine 200 is short, it is considered that the light source of the optical machine 200 is not enough to make the shielding object 20 reach the ignition point in the short time. That is, instead of immediately turning off the light source of the optical engine 200 when the presence of the shielding object 20 is detected, a timer or other methods are used to calculate the time duration for maintaining the current position of the shielding object 20, that is, the time duration for maintaining the shielding rate M of the shielding object 20 to be greater than or equal to the preset shielding rate E. When the maintenance duration of the shielding rate M of the shielding object 20 being greater than or equal to the preset shielding rate E is greater than or equal to the preset duration, it is considered that the shielding object 20 has a risk of reaching the ignition point. At this time, the light source of the optical machine 200 should be turned off to avoid safety accidents. The duration of the time for obtaining the shielding rate M of the shielding object 20 greater than or equal to the preset shielding rate E may be timed by a timer, or may be calculated by an external timing device.
In some embodiments, before the step of turning off the light source of the light engine 200 when the maintaining time period is determined to be greater than or equal to the preset time period, the method further includes:
obtaining a comparison difference value of comparison difference values between a shielding rate M of the shielding object 20 and a preset shielding rate E; and acquiring the preset time length according to the comparison difference, wherein the absolute value of the comparison difference is inversely related to the length of the preset time length.
Specifically, in this embodiment, the preset time length is not a fixed value, but the corresponding preset time length is selected according to a comparison difference between the currently obtained shielding rate M of the shielding object 20 and the preset shielding rate E. When the comparison difference value calculated at present is larger, it indicates that the shielded part of the light machine 200 is larger, that is, the equivalent area is larger, and at this time, the preset time that can be given is shorter (more shielding is provided, and the shielding object 20 is easy to burn); when the comparison difference obtained currently is smaller, it indicates that the part of the current optical machine 200 which is shielded is smaller, and at this time, the preset time duration can be given to be slightly longer (the shielding is less, and the shielding object 20 is not easy to burn).
Specifically, first, a comparison difference between the shielding rate M of the shielding object 20 and the preset shielding rate E is obtained, and since it has been previously determined that the current shielding rate M is greater than or equal to the preset shielding rate E, the comparison difference means that the current shielding rate M is greater than the preset shielding rate E. The larger the amplitude larger than the preset shielding rate E is, the larger the shielding rate E is, the more the optical machine 200 is shielded by the shielding object 20 at this time, the easier the combustion is, and the obtained preset time is shorter; the smaller the amplitude larger than the preset shielding rate E is, the smaller the shielding object 20 shields the optical machine 200, the burning is not easy, and the obtained preset duration is longer. For example, the preset duration obtained when the magnitude of the shielding rate M is 5% greater than the preset shielding rate E is greater than the preset duration obtained when the magnitude of the shielding rate M is 10% greater than the preset shielding rate E.
There are many ways how to obtain the preset time length according to the absolute value of the comparison difference, and several embodiments are described below.
Through the form of a mapping table, the step of obtaining the preset time length according to the comparison difference value comprises the following steps: acquiring a mapping table between the comparison difference and a preset time length; and acquiring corresponding preset time length from the mapping table according to the comparison difference. In this embodiment, a mapping table of the comparison difference and the preset time length is stored in the storage device of the projector 10, different comparison differences correspond to different preset time lengths, the larger the comparison difference is, the shorter the preset time length is, and the smaller the comparison difference is, the longer the preset time length is. And acquiring the corresponding preset time length from the mapping table through the currently calculated comparison difference value. The method is convenient to obtain, has small calculation amount and can effectively improve the reaction speed.
Calculating according to a preset functional relation, wherein the step of obtaining the preset duration according to the comparison difference comprises the following steps: acquiring a functional relation between the comparison difference and a preset time length; and calculating the preset time length according to the comparison difference and the functional relation. In this embodiment, the functional relationship may be a binary primary function, such as a downward-sloping straight line equation, or a quadratic function, such as a part of a parabola, or the like. The specific function can be determined according to the specific actual situation.
In some embodiments, to further improve the accuracy of the detection and judgment, before the step of turning off the light source of the optical machine 200, the method further includes:
acquiring the current temperature of the shade 20;
determining that the current temperature of the covering 20 is above the preset safe temperature, the light source of the light engine 200 is turned off.
Specifically, in this embodiment, in order not to affect the use of the projector 10, the temperature of the shielding object 20 in front of the projector 10 is detected, and if the current temperature of the shielding object 20 is less than or equal to the preset safe temperature, it indicates that the temperature of the shielding object 20 is not high, and will not burn, and is still in a safe state, and it is not necessary to turn off the optical engine 200. When the current temperature of the shade 20 is higher than the preset safe temperature, it indicates that the temperature of the shade 20 is higher, and there is a safety hazard of burning, and the light source of the optical engine 200 should be turned off. The preset safe temperature can be 90-110 ℃, for example 100 ℃. There are many ways to obtain the temperature, such as by a temperature sensor. The temperature sensor can be an infrared temperature measurement sensor module, and the highest temperature measurement range can meet the requirement at 110 ℃.
In some embodiments, in order to prompt the user in time, after the step of determining that the shape parameter is outside the preset shape parameter range, the method further includes:
and sending out prompt information.
The prompting message can be in many forms, such as short message, light message, sound message, vibration message, etc., and the voice prompt is taken as an example. Of course, in some embodiments, in order to prompt the user more effectively, a combination of the above prompting manners may be used, such as voice broadcasting and indicator light flashing prompting. The voice prompt can be performed through a loudspeaker, and the played content is stored in the memory.
In some embodiments, in order to quickly bring the projector 10 into use after the shutter 20 is removed, the step of turning off the light source of the light engine 200 further includes:
and when the shielding rate M of the shielding object 20 is determined to be smaller than the preset shielding rate E, the light source of the optical machine 200 is turned on again.
Comparing the shielding rate M of the shielding object 20 with the preset shielding rate E, when the shielding rate M of the shielding object 20 is smaller than the preset shielding rate E, the shielding object 20 is considered to have been removed, and the projector 10 can work normally and safely. At this time, the projector 10 is turned back on. Of course, in some embodiments, to improve safety, the switch may be turned on after a certain period of time.
The invention further provides a projector, which includes a memory, a processor and an over-temperature protection program stored in the memory and operable on the processor, wherein the over-temperature protection program for switching on and off the projection light source is executed by the processor to implement the steps of the safe operation method of the projector as claimed above. The specific scheme of the safe working method of the projector refers to the above embodiments, and since the projector adopts all the technical schemes of all the above embodiments, the projector at least has all the beneficial effects brought by the technical schemes of the above embodiments, and details are not repeated herein.
The invention further proposes a projector 10, the projector 10 comprising:
a light engine 200, the light engine 200 comprising a light source;
the camera device 300 is arranged close to the optical machine 200, and a shooting area of the camera device 300 covers a projection area imaged by the optical machine 200; the image capturing device 300 captures a projected image of a projection area;
the main control circuit 100 is electrically connected to the optical engine 200 and the camera device 300, and turns on or off a light source of the optical engine according to parameters of a projected image of a projection area photographed by the camera device 300.
Specifically, in this embodiment, the image capturing device 300 and the temperature sensor 700 are arranged along the circumference of the optical machine 200 and are both disposed close to the optical machine 200. The temperature sensor 700 and the camera device 300 are both disposed on the housing of the projector 10, so that the temperature of the object in front of the optical engine 200 can be directly detected, and the projected image of the projection area of the optical engine 200 can be collected. The temperature sensor 700 converts the detected data into a current or a voltage of different intensity. The camera device obtains parameters of the projected image of the projection area through shooting, and the parameters are input to the main control circuit in the form of current or voltage. The main control circuit 100 receives the parameters sent by the camera 300 and the temperature sensor 700, that is, receives the currents or voltages with different intensities. When the current or voltage sent by the camera device 300 triggers the main control circuit 100, the comparison circuit of the main control circuit 100 compares the received current and voltage with a preset current or voltage range, and when the current and voltage exceed the preset current or voltage range, triggers the switch circuit of the optical machine and turns off the power supply of the optical machine; when the current and the voltage are within the preset current or voltage range, the switch circuit of the optical machine is triggered, and the power supply of the optical machine is started.
In some embodiments, for more accurate control, when the current and the voltage received by the comparison circuit exceed the preset current or voltage range, the switching circuit of the optical machine is not directly triggered, but the temperature sensor is triggered to work. The temperature sensor may be directly electrically connected to the switch circuit of the optical machine, or may be electrically connected to the switch circuit of the optical machine through the main control circuit 10. The main control circuit 100 receives the detection parameter sent by the temperature sensor 700, and when the current or voltage intensity reaches a preset intensity, the main control circuit 100 is triggered to control the optical machine 200 to turn on or turn off the light source. Specifically, how to control can be referred to the above embodiments, and details are not described herein.
It should be noted that, in some embodiments, the number of the image capturing devices may be set according to requirements in order to improve the accuracy of capturing the projection images. For example, two image capturing devices are provided, specifically, the image capturing devices include two image capturing devices, one of the two image capturing devices is provided on the upper side or the lower side of the optical machine, and the other image capturing device is provided on the left side or the right side of the optical machine. In the two camera devices, the focal length of one of the two camera devices is larger than that of the other camera device, so that the projection pattern with higher quality can be obtained. In some embodiments, one of the two cameras is a color camera and the other is a black-and-white camera, which can be selected and invoked according to different working conditions.
In some embodiments, in order to improve the accuracy of turning on and off the light source of the optical engine 200, the projector 10 further includes a timer 800, the timer 800 is electrically connected to the main control circuit 100, and the timer 800 is used for calculating the time period for which the projected image of the projection area of the optical engine 200 maintains the current shape.
In some embodiments, in order to timely remind the user of paying attention to the working state of the projector 10, the projector 10 further includes a speaker 510 and a memory 600, the speaker 510 and the memory 600 are connected to the main control circuit 100, the speaker 510 is used for voice broadcast, and the memory 600 is used for storing data of the voice broadcast. In order to facilitate the user to hear the voice content broadcasted by the speaker 510, the projector 10 includes a housing, and the speaker 510 is disposed on the housing.
In some embodiments, in order to timely remind the user of the working state of the projector 10, the projector 10 further includes an indicator lamp 520, and the indicator lamp 520 is electrically connected to the main control circuit 100. In order to facilitate the user to notice the projector 10 in time, the projector 10 includes a housing, and the indicator light 520 is disposed on a surface of the housing, which is adjacent to or opposite to a surface of the light engine 200 emitting light. In this manner, the indicator light 520 is advantageously visible to the user.
In some embodiments, in order to timely remind the user of paying attention to the working state of the projector 10, the projector 10 further includes an information sending device and a memory 600, the information sending device and the memory 600 are connected to the main control circuit 100, the information sending device is configured to send out information, and the memory 600 is configured to store data of the information. The information sending device can send information to a specified mobile terminal, such as a mobile phone, and can also send the information to terminal equipment, such as a display screen.
In some embodiments, the projector further includes a temperature sensor, the temperature sensor is electrically connected to the main control circuit, and the camera device and the temperature sensor are arranged along the circumferential direction of the optical machine. The camera device is arranged in the edge area of the upper side or the edge area of the lower side of the optical machine, and the center of the camera device and the center of the optical machine are on the same vertical line. Or the camera device is arranged at the edge area of the left side or the right side of the optical machine, and the center of the camera device and the center of the optical machine are on the same horizontal straight line.
Since the projection area of the projector is equivalent to an upward inclined projection area in the horizontal direction, the camera device 300 is arranged on the upper side of the light machine, and then the camera device 300 can be arranged to detect the front of the light machine. Then, when the parameters of the projected image acquired by the camera 300 are not within the preset graphic parameter range, it can be considered that the optical machine is shielded by the shielding object, so that the camera 300 can be used to perform simple one-time distance measurement on the shielding object right in front of the optical machine. When the projection area is arranged right below the optical machine, the projection area of the optical machine can be covered by the shooting area of the camera device only by slightly adjusting the deflection angle upwards. It is worth mentioning that, when the center of the camera device and the center of the optical machine are on the same horizontal straight line or the same vertical straight line, under the condition that the image acquisition direction of the camera device is consistent with the projection direction of the optical machine, the distance between the camera device and the projection area of the optical machine is equivalent to the distance between the optical machine and the projection area, thereby being beneficial to the camera device to better acquire the image of the projection area of the optical machine.
In some embodiments, for better focusing of the image pickup device, the projector further comprises a distance detection device electrically connected with the main control circuit; the center of the distance sensor 900 is on the same vertical or horizontal straight line as the center of the camera. Through distance sensor 900's setting, can be swift acquire distance between distance sensor 900 and the camera shooting region, because distance sensor 900 is located same vertical plane with camera device for the distance is equivalent between the two distance and the parallel camera shooting region (projection area) of vertical plane, is favorable to the quick preliminary location of camera device. Of course, in some embodiments, in order to obtain a more accurate distance between the image capturing device and the image capturing area, the distance between the image capturing device and the image capturing area may be calculated by obtaining a deflection angle of the distance sensor 900, and taking the distance between the distance sensor 900 and the image capturing area as a hypotenuse, where the distance between the image capturing device and the image capturing area is a square edge corresponding to the deflection angle of the distance sensor 900, that is, the length of the square edge is a product of the length of the bevel and a sine value of the deflection angle.
In some embodiments, the temperature sensor 700 is disposed in an upper edge region of the optical machine 200, and a center of the temperature sensor 700 and a center of the optical machine 200 are on the same horizontal vertical line, under normal circumstances, a light ray at the center of the optical machine is stronger, and then, a temperature at the center is higher than that at a side, so that the temperature sensor 700 can detect a temperature right in front of the optical machine, which can reduce a detection range of the temperature sensor 700, and can obtain a maximum temperature of a shielding object to a certain extent, thereby facilitating timely processing.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (4)
1. A projector safe working method is disclosed, the projector comprises an optical machine, and the projector is characterized in that a projection area N imaged by the optical machine comprises a first risk area A and a second risk area B, wherein the first risk area is arranged around the optical machine at the center of the projection area, the second risk area comprises the rest area of the projection area except the first risk area, and the area of the projection area N is F;
the safe working method of the projector comprises the following steps:
acquiring a projection image P of a barrier in a projection area imaged by an optical machine when the projector works;
acquiring an area A1 of the projected image in the first risk zone, a weight coefficient a of the first risk zone, and an area B1 of the projected image in the second risk zone, a weight coefficient B of the second risk zone;
acquiring the shielding rate M of the shielding object according to the area A1 of the first risk zone, the weight coefficient a of the first risk zone, the area B1 of the second risk zone, the weight coefficient B of the second risk zone and the total area F of the projection zone; wherein a is greater than or equal to b;
determining that the shielding rate M of the shielding object is greater than or equal to a preset shielding rate E, and turning off a light source of the optical machine;
wherein, before the step of turning off the light source of the optical machine, further comprising:
obtaining the maintaining time length that the shielding rate M of the shielding object is greater than or equal to the preset shielding rate E;
determining that the maintaining time length is greater than or equal to a preset time length, and turning off a light source of the optical machine;
wherein, confirm that the duration of maintenance is greater than or equal to when predetermineeing the duration, still include before the step of the light source of closing the ray apparatus:
obtaining a comparison difference value between the shielding rate M of the shielding object and a preset shielding rate E;
obtaining a preset time length according to the comparison difference, wherein the size of the comparison difference is inversely related to the length of the preset time length;
wherein the first risk zone comprises a third risk zone C and a fourth risk zone D, wherein the third risk zone is arranged around the light machine in the center of the projection zone, and the fourth risk zone comprises the remaining area of the first risk zone except the third risk zone;
the step of obtaining the shielding rate M of the shielding object according to the area A1 of the first risk zone, the weight coefficient a of the first risk zone, the area B1 of the second risk zone, the weight coefficient B of the second risk zone and the total area F of the projection area comprises the following steps:
acquiring the area C1 and the third weight coefficient C of the projected image in the third risk zone, and the area D1 and the fourth weight coefficient D of the projected image in the fourth risk zone; wherein c is greater than or equal to d, d is greater than or equal to b;
the method for obtaining the shielding rate M of the shielding object comprises the following steps:
M=（dD1+cC1+bB1）/F；
the first risk area A is circular, the circle center of the first risk area A is the center of the optical machine in the projection area, and the circumference of the first risk area is tangent to the side line of the projection area;
the third risk area C is circular, the center of the circle is the center of the optical machine in the projection area, and the circumference radius of the third risk area is one half of the circumference radius of the first risk area a.
2. The method as claimed in claim 1, wherein the step of obtaining the preset duration according to the comparison difference comprises:
acquiring a mapping table between the comparison difference and a preset time length;
and acquiring corresponding preset time length from the mapping table according to the comparison difference.
3. The method according to claim 1, wherein the shape of the projection area and the projection image P of the obstruction are acquired by an image acquisition device, and the step of acquiring the projection image of the obstruction in the projection area imaged by the optical engine during the operation of the projector comprises:
the image acquisition device is arranged close to the optical machine, the position of an image acquisition area of the image acquisition device is adjusted so that the image acquisition area covers a projection area of the optical machine, and an image of the projection area is acquired through the image acquisition device;
and acquiring a projection image of the obstruction in the projection area according to the image of the projection area.
4. A projector, characterized in that the projector comprises: a memory, a processor and an over-temperature protection program of the switching projection light source stored on the memory and operable on the processor, wherein the over-temperature protection program of the switching projection light source, when executed by the processor, implements the steps of the method for safely operating a projector according to any one of claims 1 to 3.
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| CN202011030662.5A CN111935469B (en) | 2020-09-27 | 2020-09-27 | Projector safe working method and projector |
| CN202110221068.2A CN112995627B (en) | 2020-09-27 | 2020-09-27 | Projector safety working method and projector |
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| WO2008155771A2 (en) * | 2007-06-21 | 2008-12-24 | Maradin Technologies Ltd. | Image projection system with feedback |
| US20090147272A1 (en) * | 2007-12-05 | 2009-06-11 | Microvision, Inc. | Proximity detection for control of an imaging device |
| CN105791784A (en) * | 2016-01-21 | 2016-07-20 | 天津大学 | Projector capable of identifying front barrier and correcting output images |
| CN108989774A (en) * | 2017-06-05 | 2018-12-11 | 北京互动文博科技有限公司 | A kind of image interactive display systems and method |
| CN107102502B (en) * | 2017-06-28 | 2019-12-06 | 山东万恒电子通讯设备有限公司 | Projection equipment control method and device |
| CN107295320A (en) * | 2017-08-07 | 2017-10-24 | 上海青橙实业有限公司 | The control method and device of projection terminal |
| US11367305B2 (en) * | 2018-09-28 | 2022-06-21 | Apple Inc. | Obstruction detection during facial recognition processes |
| CN111366244B (en) * | 2020-03-02 | 2021-08-10 | 北京迈格威科技有限公司 | Temperature measuring method and device, electronic equipment and computer readable storage medium |
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