CN112995627B - Projector safety working method and projector - Google Patents
Projector safety working method and projector Download PDFInfo
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- CN112995627B CN112995627B CN202110221068.2A CN202110221068A CN112995627B CN 112995627 B CN112995627 B CN 112995627B CN 202110221068 A CN202110221068 A CN 202110221068A CN 112995627 B CN112995627 B CN 112995627B
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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
- H04N9/315—Modulator illumination systems
- H04N9/3155—Modulator illumination systems for controlling the light source
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 the area A1 of the projection image in a first risk area, a weight coefficient a of the first risk area, and the area B1 of the projection image in a second risk area, and a weight coefficient B of the second risk area; acquiring a shielding rate M of a 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 larger 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
Master case information: applicants: shenzhen City, dangzhi technologies Co., ltd; application number: 202011030662.5; filing date: 09 month 27 of 2020; patent name: a projector safe working method and a projector.
Technical Field
The invention relates to the technical field of projectors, in particular to a projector safety working method and a projector.
Background
With the improvement of living standard of people, the use of projectors is increasing. The projector is mainly an instrument using strong light source, the light source has high illumination intensity, and the temperature is high during use, especially some light machines with high power and high brightness. When dark inflammable matter is blocked in a short distance, the temperature in the area where the inflammable matter is irradiated exceeds the ignition point, and a fire disaster is caused easily.
Disclosure of Invention
The invention mainly aims to provide a safe working method of a projector, which aims to improve the use safety of the projector.
In order to achieve the above objective, the projector according to the present invention includes a light machine, a projection area N imaged by the light machine includes a first risk area a and a second risk area B, wherein the first risk area is disposed around the light machine at a central position 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 projector safe working method comprises the following steps:
acquiring a projection image P of a shielding object in a projection area imaged by an optical machine when the projector works;
acquiring the area A1 of the projection image in a first risk area, a weight coefficient a of the first risk area, and the area B1 of the projection image in a second risk area, and a weight coefficient B of the second risk area;
acquiring a shielding rate M of a 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 larger than or equal to the preset shielding rate E, and turning off the light source of the optical machine.
Optionally, the method for 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 is as follows:
M＝(aA1+bB1)/F。
optionally, the first risk area a is circular, the center of the circle is the center of the optical machine in the projection area, and the circumference of the first risk area is tangent to a side line of the projection area.
Optionally, the area A1 of the first risk area includes a third risk area C and a fourth risk area D, where the third risk area is disposed around the optical bench at the center of the projection area, and the fourth risk area includes the remaining area of the first risk area;
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 includes:
acquiring an area C1 of the projection image in a third risk area, a third weight coefficient C and an area D1 of the projection image in a fourth risk area, and a fourth weight coefficient D; wherein c is greater than or equal to d, d is greater than or equal to b;
the mode of obtaining the shielding rate M of the shielding object is as follows:
M＝(dD1+cC1+bB1)/F。
optionally, the third risk area C is circular, the center of which is the center of the optical machine in the projection area, and the radius of the circumference of the third risk area is half of the radius of the circumference of the first risk area a.
Optionally, before the step of turning off the light source of the light engine, the method further comprises:
acquiring a maintaining duration of which the shielding rate M of the shielding object is larger than or equal to a preset shielding rate E;
and when the maintenance 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, the step of turning off the light source of the optical machine further includes, when the determined maintenance time period is greater than or equal to the preset time period:
obtaining a comparison difference value between the shielding rate M of the shielding object and a preset shielding rate E;
and obtaining a preset time length according to the comparison difference value, wherein the comparison difference value is inversely related to the length of the preset time length.
Optionally, the step of obtaining the preset duration according to the comparison difference value includes:
obtaining a mapping table between the comparison difference value and a preset duration;
and obtaining corresponding preset time length from the mapping table according to the comparison difference value.
Optionally, the step of acquiring the projection image of the shielding object in the projection area imaged by the optical machine when the projector works 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 the projection image of the shielding object in the projection area according to the image of the projection area.
The invention also proposes a projector comprising: the projector comprises a memory, a processor and an overtemperature protection program of a switching projection light source, wherein the overtemperature protection program of the switching projection light source is stored in the memory and can run on the processor, and the overtemperature protection program of the switching projection light source realizes the steps of a projector safety working method when being executed by the processor, and the projector safety working method comprises the following steps:
acquiring a projection image P of a shielding object in a projection area imaged by an optical machine when the projector works;
acquiring the area A1 of the projection image in a first risk area, a weight coefficient a of the first risk area, and the area B1 of the projection image in a second risk area, and a weight coefficient B of the second risk area;
acquiring a shielding rate M of a 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 larger 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 imaged by a ray 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 ray machine at the center of 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 shielding object in a projection area imaged by an optical machine when the projector works; acquiring 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 projection image in the second risk area and the weight coefficient B of the second risk area; then, 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, the shielding rate M of the shielding object is obtained; wherein a is greater than b; then, determining that the shielding rate M of the shielding object is larger than or equal to the preset shielding rate E, and turning off the light source of the optical machine, so that when the effective area shielded by the shielding object is larger than the preset area, the shielding object can be ignited at high temperature, the light source of the optical machine is turned off timely, the shielding object is prevented from being ignited, and the projector is enabled to be safe and reliable to use, and the projector is beneficial to a user to use.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for safe operation of a projector according to an embodiment of the invention;
FIG. 2 is a schematic diagram of an embodiment of a projector according to the present invention;
FIG. 3 is a schematic diagram of the working principle of the projector according to the present invention without a barrier in front of the projector;
FIG. 4 is a schematic diagram illustrating an embodiment of a projector according to the present invention with a shutter in front of the projector;
FIG. 5 is a schematic view of an embodiment of a projection area with a shutter in front of a light engine of a projector according to the present invention;
FIG. 6 is a schematic view of another embodiment of a projection area with a shutter in front of a light engine of a projector according to the present invention;
fig. 7 is a schematic circuit diagram of an embodiment of a projector according to the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 10 | Projector with a light source | 20 | Shielding object |
| 100 | Main control circuit | 200 | Light machine |
| 300 | Image pickup apparatus | 510 | Loudspeaker |
| 520 | Indicating lamp | 600 | Memory device |
| 700 | Temperature sensor | 800 | Time-piece |
| 900 | Distance sensor | A | First risk zone |
| B | Second risk zone | C | Third risk zone |
| D | Fourth risk zone | N | Projection area |
| P | Projecting an image |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
Furthermore, the description of "first," "second," etc. in this disclosure is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, "and/or" throughout this document includes three schemes, taking a and/or B as an example, including a technical scheme, a technical scheme B, and a technical scheme that both a and B satisfy; in addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The present invention mainly provides a safe working method of a projector, which is mainly applied to the projector 10 to improve the use safety of the projector 10.
The specific contents of the projector security operation method will be mainly described below.
Referring to fig. 1 to 7, in an embodiment of the present invention, a projector 10 includes a light engine 200, a projection area N imaged by the light engine 200 includes a first risk area a and a second risk area B, wherein the first risk area a is disposed around the light 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 projector safe working method comprises the following steps:
s10, acquiring a projection image P of a projection area N imaged by the optical machine 200 of the shielding object 20 when the projector 10 works;
s20, acquiring an area A1 of the projection image P in a first risk area A, a weight coefficient a of the first risk area A, and an area B1 of the projection image P in a second risk area B, and a weight coefficient B of the second risk area B;
s30, acquiring a shielding rate M of a 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;
the light source of the light engine 200 is turned off by determining that the shielding rate M of the shielding object 20 is greater than or equal to the preset shielding rate E.
Specifically, in this embodiment, when the projector 10 is operated, a projection area N imaged by the optical engine 200 will be formed on a wall or a curtain, and the content that the projector 10 needs to play will be displayed in the projection area N. The shape of the projection area N may have many shapes such as rectangle, square, and circle. 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 bench 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 any number, such as circular, square, triangular, etc., and circular is an example. There are many ways to acquire the shape of the projection area and the projected image P of the mask 20, such as by an image acquisition device. The image acquisition device is arranged close to the optical machine 200, and the position of the image acquisition area of the image acquisition device is adjusted so that the image acquisition area covers the projection area N of the optical machine 200, the projection image P of the shielding object 20 in the projection area N is acquired through the image acquisition device, and the position of the projection image P in the projection area N and the area covering the projection area N are obtained. Therefore, the image acquisition device can be ensured to fully acquire the projection image P of the projection area N, and the accuracy of acquiring the projection image P is improved. The image pickup device may include an image pickup device 300, and the image pickup device 300 picks up an image, analyzes the picked-up image, confirms the shape of the projection area N, and positions the projection image P at the projection area N and covers the projection area N. Of course, in some embodiments, the detection may be performed by using light sensors, 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.
An embodiment will be described below as to the manner in which the projection image P is acquired by image processing.
The camera captures and identifies the image in the projection area N. The process of recognizing the projection image P is as follows: firstly, capturing a gray image from a camera, and then performing Gaussian filtering on the gray image. And processing the gray level image after Gaussian filtering to obtain a gray level histogram, extracting a threshold value, and performing binarization processing. Finally, contour extraction is carried out on the binarized image. Thereby obtaining the outline of the projection 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, the area B1 of the projection image P in the second risk area B, and the weight coefficient B of the second risk area B are acquired. The area A1 of the projection image P in the first risk area A and the area B1 of the second risk area B are determined according to the position of the projection image P in the projection area N. The method comprises the steps of firstly determining the position, the shape and the total area of a projection image P compared with a projection area N, and then determining the parts of the projection image P located in a first risk area A and a second risk area B according to the position of the projection image P to obtain the area A1 of the projection image P in the first risk area A and the area B1 of the projection image P in the second risk area B respectively.
Acquiring a shielding rate M of a 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; there are many ways to obtain the shielding rate M of the shielding object 20, for example, by calculating through a formula, and more pre-stored mapping tables may be used for obtaining, where the mapping tables are mapping tables between M and A1, a, B1, B, and F. In general, the larger the area A1 of the first risk area A and the area B1 of the second risk area B, the larger the shielding rate M, the greater the risk; since the weight coefficient a of the first risk area a is larger than the weight coefficient B of the second risk area B, the larger the area A1 of the first risk area a (the closer the projected image P is to the intermediate position of the projection area N), the larger the shielding rate M; of course, the larger the total area F, the less likely it is to be blocked, and the smaller the blocking rate M; that is, M and F are inversely related, and M and A1, a, B1, B are positively related.
After the shielding rate M is obtained, it is compared with a preset shielding rate E. The light source of the light engine 200 is turned off by determining that the shielding rate M of the shielding object 20 is greater than or equal to the preset shielding rate E. The area covered by the shielding object 20 is beyond the range allowed by the preset safe operation, and the power of the optical machine 200 needs to be turned off. The determination that the shielding rate M of the shielding object 20 is smaller than the preset shielding rate E indicates that the proportion of shielding is within the range allowed by safe operation, and the light source may be temporarily not turned off. The preset shielding rate may be 20% -50%, when the preset shielding rate is lower, the safety coefficient is correspondingly higher, and when the shielding object 20 exists, the power supply is also easier to be turned off, so that the lowest preset shielding rate is set to 20%, and if the shielding rate is lower, normal use of a user is affected. When the preset shielding rate is higher, the safety coefficient is lower, and when the shielding object 20 exists, the safety accident is easy to occur, so that the highest preset shielding rate is set to be 50%, if the highest preset shielding rate is higher, potential safety hazards exist, and the safety hazard is not beneficial to safe use of users.
In this embodiment, the projection area N imaged by the optical bench 200 is set to include a first risk area a and a second risk area B, where the first risk area a is set around the optical bench 200 at the center of the projection area, and the second risk area B includes the remaining area of the projection area N, and the area of the projection area N is F; firstly, acquiring a projection image P of a projection area N imaged by a shielding object 20 in an optical machine 200 when the projector 10 works; acquiring the area A1 of the projection image P in the first risk area A, the weight coefficient a of the first risk area A, the area B1 of the projection image P in the second risk area B and the weight coefficient B of the second risk area B; then, 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, the shielding rate M of the shielding object 20 is obtained; wherein a is greater than b; then, 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, so that when the effective area shielded by the shielding object 20 is greater than the preset area, the shielding object 20 can be ignited at a high temperature, and the light source of the optical machine 200 is turned off timely, so that the shielding object 20 is prevented from being ignited, the projector 10 becomes safe and reliable in use, and the projector 10 is beneficial to users.
In some embodiments, in order to calculate the shielding rate M more accurately, the method for 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 is as follows: m= (aa1+bb1)/F.
Specifically, in this embodiment, the product of the area A1 of the first risk area a and the weight coefficient a of the first risk area a is the effective area or equivalent area of the projected image P of the obstruction 20 in the first risk area a. The weight coefficient a of the first risk area a may be 0.7 to 1.8. The product of the area B1 of the second risk area B and the weight coefficient B of the second risk area B is the effective area or equivalent area of the projected image P of the obstacle 20 in the second risk area B. Wherein the weight coefficient B of the second risk area B may be 0.4 to 0.7. The shielding rate M is obtained by first calculating the equivalent area of the projection image P in the projection area N and dividing the equivalent area by the total area of the projection area N.
In some embodiments, in order to improve the accuracy of the equivalent area of the projected image P as much as possible, the first risk area a is circular, the center of which is the center of the optical bench 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 center of the optical bench 200 in the projection area is used as the center, and the radius extends to the edge 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 equivalent area is improved. Taking the shape of the projection area N as a rectangle as an example, the optical machine 200 is at the center of the projection area N as the intersection point 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 except the circle in the rectangle is the second risk area B.
In some embodiments, in order to further improve the calculation accuracy of the equivalent area and improve the calculation progress of the shielding rate, the area A1 of the first risk area a includes a third risk area C and a fourth risk area D, where the third risk area C is disposed around the optical machine 200 in the center of the projection area, and the fourth risk area D includes the remaining area of the first risk area a;
the step of 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 includes:
acquiring an area C1 of the projection image P in a third risk area C, a third weight coefficient C, and an area D1 of the projection image P in a fourth risk area D, a fourth weight coefficient 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 20 is: m= (dd1+cc1+bb1)/F.
Specifically, in the present 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 optical engine 200 in the center of the projection area. It should be noted that, in other embodiments, 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, where different areas have different weight coefficients, and the closer to the center of the optical bench 200 in the projection area, the higher the weight coefficient, and the further the distance, the lower the weight coefficient.
The product of the area C1 of the third risk area C and the weight coefficient C of the third risk area C is the effective area or equivalent area of the projected image P of the obstacle 20 in the third risk area C. The weight coefficient C of the third risk area C may be 1.2 to 1.8, for example, 1.5. The product of the area D1 of the fourth risk area D and the weight coefficient D of the fourth risk area D is the effective area or equivalent area of the projected image P of the obstacle 20 in the fourth risk area D. The weight coefficient D of the fourth risk area D may be 0.7 to 1.2, for example, 1. The shielding rate M is obtained by first calculating the equivalent area of the projection image P in the projection area N and dividing the equivalent area by the total area of the projection area 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 area C is circular, the center of which is the center of the optical bench 200 in the projection area, and the radius of the circumference of the third risk area C is half of the radius of the circumference of the first risk area a. In this embodiment, the center of the optical bench 200 in the projection area is used as the center, and one half of the radius of the circumference of the first risk area a is used as the radius. Therefore, the third risk area C scientifically divides the part with high temperature on the projection area N, and a high weight coefficient is given to the area, so that the accuracy of equivalent area is improved. Taking the shape of the projection area N as a rectangle as an example, the optical machine 200 is at the center of the projection area N as the intersection point 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 line of the fourth risk area D coincides with the edge line of the first risk area a.
In some embodiments, to minimize the impact on user usage and improve accuracy and practicality of the determination, before the step of turning off the light source of the optical machine 200, the method further includes: acquiring a maintenance duration of which the shielding rate M of the shielding object 20 is larger than or equal to a preset shielding rate E; and when the maintenance time period is determined to be longer than or equal to the preset time period, turning off the light source of the optical engine 200. In this embodiment, if the time for the shutter 20 to block the light machine 200 is short, the light source of the light machine 200 is considered insufficient to make the shutter 20 reach the ignition point in a short time. That is, instead of immediately turning off the light source of the light engine 200 when the obstruction 20 is detected, a timer or other means is used to calculate the duration of the obstruction 20 for maintaining the current position, that is, the duration of the period when the obstruction rate M of the obstruction 20 is greater than or equal to the preset obstruction rate E. When the maintenance time period of the shielding rate M of the shielding 20 is greater than or equal to the preset shielding rate E and is greater than or equal to the preset time period, it is considered that the shielding 20 has a risk of reaching the ignition point. At this time, the light source of the light engine 200 should be turned off to avoid safety accidents. The duration of time for obtaining the shielding rate M of the shielding object 20 greater than or equal to the preset shielding rate E may be counted by a timer, or may be calculated by an external timer device.
In some embodiments, the step of turning off the light source of the light engine 200 further comprises, prior to determining that the maintenance time period is greater than or equal to the preset time period:
obtaining a comparison difference value of a comparison difference value between the shielding rate M of the shielding object 20 and a preset shielding rate E; and acquiring a preset time length according to the comparison difference value, wherein the absolute value of the comparison difference value is inversely related to the length of the preset time length.
Specifically, in this embodiment, the preset duration is not a fixed value, but a corresponding preset duration is selected according to a comparison difference between the shielding rate M of the currently acquired shielding object 20 and the preset shielding rate E. When the currently calculated comparison difference is larger, it indicates that the shielded portion of the current optical engine 200 is larger, that is, the equivalent area is larger, and at this time, the given preset duration is shorter (the shielding is more, and the shielding object 20 is easy to burn); when the current acquired comparison difference is smaller, it indicates that the shielded portion of the current optical engine 200 is smaller, and at this time, the preset duration may be slightly longer (the shielding is less, and the shielding object 20 is not easy to burn).
Specifically, firstly, the comparison difference between the shielding rate M of the shielding object 20 and the preset shielding rate E is that the current shielding rate M is greater than or equal to the preset shielding rate E, and therefore, the comparison difference is that the current shielding rate M is greater than the preset shielding rate E. The larger the amplitude of the shielding rate E is larger, the more shielding objects 20 shield the optical machine 200, the combustion is easy, and the acquired preset duration is smaller; the smaller the amplitude larger than the preset shielding rate E, the smaller the shielding object 20 shields the optical machine 200, so that the burning is difficult, and the acquired preset time length is longer. For example, the preset time period acquired when the shielding rate M is greater than the magnitude of the preset shielding rate E by 5% is greater than the preset time period acquired when the shielding rate M is greater than the magnitude of the preset shielding rate E by 10%.
There are many ways how the preset time period can be obtained based on the absolute value of the comparison difference, and several examples will be described below.
The step of obtaining the preset duration according to the comparison difference value comprises the following steps of: obtaining a mapping table between the comparison difference value and a preset duration; and obtaining corresponding preset time length from the mapping table according to the comparison difference value. In this embodiment, a mapping table of comparison differences and preset durations is stored in the storage device of the projector 10, and different comparison differences correspond to different preset durations, and the larger the comparison differences, the shorter the preset durations, the smaller the comparison differences, and the longer the preset durations. 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 operand and can effectively improve the reaction speed.
Calculating through a preset functional relation, wherein the step of obtaining the preset duration according to the comparison difference value comprises the following steps: acquiring a functional relation between the comparison difference value and a preset duration; and calculating the preset time length according to the comparison difference and the function relation. In this embodiment, the functional relationship may be a binary primary function, such as a straight line equation inclined downward, or a secondary function, such as a portion of a parabola, or the like, which is inversely related. The specific function may be determined according to the specific situation.
In some embodiments, to further improve the accuracy of detection and determination, the method further includes, before the step of turning off the light source of the optical machine 200:
acquiring the current temperature of the shade 20;
it is determined that the current temperature of the shade 20 is higher than the preset safe temperature, and the light source of the optical machine 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 will be detected, and if the current temperature of the shielding object 20 is less than or equal to the preset safe temperature, it is indicated that the temperature of the shielding object 20 is not high, and will not burn, and is still in a safe state, and the light machine 200 does not need to be turned off. When the current temperature of the shielding object 20 is greater than the preset safe temperature, it is indicated that the temperature of the shielding object 20 is already higher, and there is a safety hazard of combustion, and the light source of the optical machine 200 should be turned off. The preset safe temperature may be 90-110 deg.c, for example 100 deg.c. There are many ways to obtain the temperature, such as by a temperature sensor. The temperature sensor can be an infrared temperature sensor module, and the highest temperature measuring range can meet the requirements at 110 ℃.
In some embodiments, to alert the user in time, after the step of determining that the determined shape parameter is outside the preset shape parameter range, further comprises:
and sending out prompt information.
The form of the prompt information can be a plurality of forms, such as short message, lamplight information, sound information, vibration information and the like, taking voice prompt as an example. Of course, in some embodiments, to more effectively prompt the user, multiple of the above multiple prompting modes may be used in combination, for example, voice broadcasting and flashing of an indicator light. The voice prompt may be content played through a speaker, and the content is stored in a memory.
In some embodiments, in order to enable the projector 10 to be quickly put into use after the shade 20 is removed, the step of turning off the light source of the light engine 200 further includes:
when it is determined that the shielding rate M of the shielding object 20 is smaller than the preset shielding rate E, the light source of the light engine 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 be moved away, and the projector 10 can work normally and safely. At this time, the projector 10 is turned back on. Of course, in some embodiments, the opening may be extended for a certain period of time to improve the security.
The invention also provides a projector, which comprises a memory, a processor and an overtemperature protection program of a switching projection light source, wherein the overtemperature protection program of the switching projection light source is stored in the memory and can run on the processor, and the overtemperature protection program of the switching projection light source realizes the steps of the projector safety working method according to the claims when being executed by the processor. The specific scheme of the projector safety working method refers to the above embodiments, and because the projector adopts all the technical schemes of all the embodiments, the projector has at least all the beneficial effects brought by the technical schemes of the embodiments, and the description is omitted herein.
The present invention further proposes a projector 10, the projector 10 comprising:
a light engine 200, the light engine 200 comprising a light source;
an imaging device 300, wherein the imaging device 300 is arranged close to the optical machine 200, and an imaging area of the imaging device 300 covers a projection area imaged by the optical machine 200; the image pickup device 300 picks up a projection image of the projection area;
the main control circuit 100 is electrically connected with the optical engine 200 and the image capturing device 300, and turns on or off the light source of the optical engine according to the projection image parameters of the projection area captured by the image capturing device 300.
Specifically, in this embodiment, the image capturing device 300 and the temperature sensor 700 are arranged along the circumferential direction of the optical machine 200, and are disposed close to the optical machine 200. The temperature sensor 700 and the image pickup device 300 are both disposed on the housing of the projector 10, so that the temperature of an object in front of the camera 200 can be directly detected, and the projected image of the projected area of the camera 200 can be collected. The temperature sensor 700 converts the detected data into a current or voltage of a different intensity. The image pickup device obtains projection image parameters 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 parameters transmitted from the image pickup device 300 and the temperature sensor 700, that is, receives different intensities of current or voltage. When the current or voltage sent by the image pickup 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, the switch circuit of the optical machine is triggered, and the power supply of the optical machine is turned off; when the current and the voltage are in a preset current or voltage range, a switching circuit of the optical machine is triggered, and a power supply of the optical machine is started.
In some embodiments, for more accurate control, when the current and voltage received by the comparison circuit exceed the preset current or voltage range, the switch circuit of the optomachine is not directly triggered, but the temperature sensor is triggered to work. The temperature sensor may be directly electrically connected to the switching circuit of the optical engine, or may be electrically connected to the switching circuit of the optical engine 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 the preset intensity, the main control circuit 100 is triggered to control the optical engine 200 to turn on or off the light source. In particular, reference may be made to the above embodiments, and details thereof are not repeated here.
It should be noted that, in some embodiments, in order to improve the accuracy of capturing the projection image, the number of the image capturing devices may be set according to the requirement. For example, two image pickup devices are provided, and in particular, the image pickup devices include two, one of which is provided on the upper side or the lower side of the optical machine and the other of which is provided on the left side or the right side of the optical machine. In the two image pick-up devices, one focal length is larger than the other focal length, so that higher-quality projection patterns are obtained. In some embodiments, one of the two image capturing devices is a color image capturing device, and the other is a black-and-white image capturing device, and the two image capturing devices can be selected and called according to different working conditions.
In some embodiments, to improve the accuracy of turning on and off the light source of the light engine 200, the projector 10 further includes a timer 800, where the timer 800 is electrically connected to the main control circuit 100, and the timer 800 is used to calculate the duration of time that the projected image of the projection area of the light engine 200 maintains the current shape.
In some embodiments, in order to prompt the user to pay attention to the working state of the projector 10 in time, the projector 10 further includes a speaker 510 and a memory 600, where the speaker 510 and the memory 600 are connected to the main control circuit 100, the speaker 510 is used for voice broadcasting, and the memory 600 is used for storing data of the voice broadcasting. Wherein, in order to facilitate the user hearing the voice content broadcast 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 prompt the user to pay attention to the operation state of the projector 10, the projector 10 further includes an indicator light 520, and the indicator light 520 is electrically connected to the main control circuit 100. Wherein, in order to facilitate the user's timely notice of the projector 10, 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 machine 200 emitting light. In this manner, the indicator light 520 is facilitated to be seen by the user.
In some embodiments, in order to prompt the user to pay attention to the working state of the projector 10, the projector 10 further includes an information sending device and a memory 600, where the information sending device and the memory 600 are connected to the main control circuit 100, the information sending device is used to send information to the outside, and the memory 600 is used to store data of the information. The information transmitting device may transmit information to a specified mobile terminal, such as a mobile phone, or may transmit information to a terminal device, such as a display screen.
In some embodiments, the projector further comprises a temperature sensor 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 upper side edge area or the lower side edge area 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 image pickup device is arranged in the left side or the right side edge area of the optical machine, and the center of the image pickup device and the center of the optical machine are on the same horizontal line.
Since the projection area of the projector corresponds to an upwardly inclined projection area in the horizontal direction, and the image pickup device 300 is disposed on the upper side of the optical machine, the image pickup device 300 may be disposed to detect the front face thereof. When the parameters of the projected image acquired by the image capturing device 300 are not within the preset graphic parameters, it can be considered that the light machine is blocked by the blocking object, so that the blocking object right in front of the image capturing device 300 can be simply and once used for ranging. When the camera is arranged right below the camera, the shooting area of the camera can cover the projection area of the optical machine only by slightly adjusting the deflection angle upwards. It should be noted that, when the center of the image capturing device and the center of the optical machine are on the same horizontal line or the same vertical line, the distance between the image capturing device and the projection surface of the optical machine is equivalent to the distance between the optical machine and the projection surface of the optical machine under the condition that the image capturing direction of the image capturing device is consistent with the projection direction of the optical machine, and therefore, the image capturing device is beneficial to better capturing the image of the projection area of the optical machine.
In some embodiments, for better focusing of the image capturing device, the projector further comprises a distance detection device, and the distance detection device is electrically connected with the main control circuit; the center of the distance sensor 900 is located on the same vertical or horizontal line as the center of the camera. Through the setting of distance sensor 900, distance between distance sensor 900 and the region of making a video recording can be swift, because distance sensor 900 and camera are located same vertical plane for the distance between the parallel region of making a video recording of two distances and vertical plane (projection area) is equivalent, is favorable to quick preliminary location of camera. 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 distance sensor 900 and the image capturing area may be used as a hypotenuse by obtaining the offset angle of the distance sensor 900, and the distance between the image capturing device and the image capturing area is a right-angle side corresponding to the offset angle of the distance sensor 900, that is, the length of the right-angle side is the product of the length of the inclined plane and the sine value of the offset angle.
In some embodiments, the temperature sensor 700 is disposed in the upper side edge area of the optical bench 200, and the center of the temperature sensor 700 and the center of the optical bench 200 are on the same horizontal and vertical line, and under normal conditions, the light of the center of the optical bench is strong, so that the temperature of the center is also higher relative to the side edge, so that the temperature sensor 700 can detect the temperature right in front of the center, thus the detection range of the temperature sensor 700 can be reduced, and meanwhile, the highest temperature of the shielding object can be obtained to a certain extent, so that the processing is convenient in time.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.
Claims (4)
1. The projector safe working method 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, and the area of the projection area N is F;
the projector safe working method comprises the following steps:
acquiring a projection image P of a shielding object in a projection area imaged by an optical machine when the projector works;
acquiring the area A1 of the projection image in a first risk area, a weight coefficient a of the first risk area, and the area B1 of the projection image in a second risk area, and a weight coefficient B of the second risk area;
acquiring a shielding rate M of a 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;
determining that the shielding rate M of the shielding object is larger than or equal to the preset shielding rate E, and turning off a light source of the optical machine;
the method for 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 is as follows:
m= (aa1+bb1)/F; the weight coefficient a is 0.7-1.8, and the weight coefficient b is 0.4-0.7;
the first risk area A is circular, the center of the circle is the center of the optical machine in the projection area, and the circumference of the first risk area A is tangent to the side line of the projection area;
before the step of turning off the light source of the light engine, further comprising:
acquiring a maintaining duration of which the shielding rate M of the shielding object is larger than or equal to a preset shielding rate E;
when the maintenance time length is determined to be longer than or equal to the preset time length, the light source of the optical machine is turned off;
and when the maintenance time length is determined to be greater than or equal to the preset time length, the step of turning off the light source of the optical machine further comprises the following steps:
obtaining a comparison difference value between the shielding rate M of the shielding object and a preset shielding rate E;
and obtaining a preset time length according to the comparison difference value, wherein the comparison difference value is inversely related to the length of the preset time length.
2. The projector security operation method of claim 1, wherein the step of obtaining the preset time period based on the comparison difference value comprises:
obtaining a mapping table between the comparison difference value and a preset duration;
and obtaining corresponding preset time length from the mapping table according to the comparison difference value.
3. The method of claim 1, wherein the step of obtaining a projected image of the projection area of the mask imaged by the optical machine when the projector is in operation 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 the projection image of the shielding object in the projection area according to the image of the projection area.
4. A projector, the projector comprising: a memory, a processor and an over-temperature protection program of a switched projection light source stored on the memory and operable on the processor, which when executed by the processor, implements the steps of the projector safety operating method according to any one of claims 1 to 3.
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| 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 |
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| 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 |
| 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 |
| 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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| WO2008155771A2 (en) * | 2007-06-21 | 2008-12-24 | Maradin Technologies Ltd. | Image projection system with feedback |
| 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 |
| CN107102502A (en) * | 2017-06-28 | 2017-08-29 | 田进 | A kind of projector equipment control method and device |
| CN110968855A (en) * | 2018-09-28 | 2020-04-07 | 苹果公司 | Occlusion detection during face recognition process |
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