WO2021139502A1 - Procédé de protection de l'œil humain pour projecteur et projecteur - Google Patents

Procédé de protection de l'œil humain pour projecteur et projecteur Download PDF

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Publication number
WO2021139502A1
WO2021139502A1 PCT/CN2020/137105 CN2020137105W WO2021139502A1 WO 2021139502 A1 WO2021139502 A1 WO 2021139502A1 CN 2020137105 W CN2020137105 W CN 2020137105W WO 2021139502 A1 WO2021139502 A1 WO 2021139502A1
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WO
WIPO (PCT)
Prior art keywords
projector
image
dark field
image information
matrix
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Application number
PCT/CN2020/137105
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English (en)
Chinese (zh)
Inventor
宋起涛
李艳波
Original Assignee
深圳光峰科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2021139502A1 publication Critical patent/WO2021139502A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T7/00—Image analysis
    • 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]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N9/00—Details of colour television systems
    • H04N9/12—Picture reproducers
    • H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
    • H04N9/3179—Video signal processing therefor
    • H04N9/3182—Colour adjustment, e.g. white balance, shading or gamut

Definitions

  • This application relates to the technical field of projectors, and in particular to a method for protecting eyes of a projector and a projector.
  • a projector also known as a projector, is a device that can project images or videos onto a screen. At present, it has been extremely widely used in various occasions, such as various meeting places, classrooms, and so on.
  • the inventor of the present application found that the current beam emitted by the projector is likely to cause damage to the user’s vision. Specifically, when the user walks into the projection area, the user’s eyes will be stabbed by the beam emitted by the projector, even if the user walks out behind. The projection area is also difficult to restore vision in a short time.
  • the existing common practice is to turn off the light source of the projector when it detects that there is an obstruction in the projection field of the projector.
  • this approach also has the following defects: when the obstruction is not the user , Turning off the light source of the projector will affect the display effect and reduce the user experience.
  • the main technical problem to be solved by this application is to provide a method for protecting eyes of a projector and the projector, which can protect the eyesight of the viewer without affecting the projection effect.
  • a technical solution adopted in this application is to provide a method for protecting eyes of a projector, the method for protecting eyes includes: acquiring first image information output by the projector at the same time and The second image information projected and displayed on the projection screen corresponding to the projector; compare the first image information and the second image information to determine a dark field area; receive the projector according to the dark field area Dark field processing is performed on the image of, so that the brightness of the portion corresponding to the dark field area in the image output by the projector is less than the brightness threshold.
  • a projector including a communication circuit and a processor coupled to it, the communication circuit being used to obtain the first image output by the projector at the same time Information and the second image information projected and displayed on the projection screen corresponding to the projector, the processor is used to compare the first image information and the second image information to determine the dark field area, and further according to the The dark field area performs dark field processing on the image received by the projector, so that the brightness of the part corresponding to the dark field area in the image output by the projector is less than a brightness threshold.
  • the beneficial effect of the present application is that the eye protection method used for the projector of the present application first obtains the first image information output by the projector at the same time and the second image information projected and displayed on the projection screen, and then compares the first image information and the second image information. 2. Determine the dark field area based on the image information, and finally perform dark field processing on the image received by the projector according to the dark field area, so that the brightness of the corresponding dark field area in the image output by the projector is less than the first brightness threshold.
  • the The method can ensure that the brightness of the image finally projected on the obstruction is less than the first brightness threshold by performing dark field processing on the image received by the projector, so that when the obstruction is the user, the light emitted by the projector can prevent the user from damaging his vision.
  • Fig. 1 is a schematic diagram of the structure of a projection system in the prior art
  • FIG. 2 is a schematic flowchart of an embodiment of the human eye protection method for a projector according to the present application
  • Fig. 3 is a schematic structural diagram of an embodiment of a projector according to the present application.
  • FIG. 4 is a schematic structural diagram of another embodiment of the projector of the present application.
  • Fig. 5 is a schematic structural diagram of an embodiment of the computer-readable storage medium of the present application.
  • the projection system 100 includes a projector 110 and a corresponding projection screen 120.
  • the projector 110 will receive an image or video from a playback source. It is projected onto the corresponding projection screen 120, and the rear projection screen 120 displays.
  • the eye protection method for projectors in this application can be used on any type of projector 110 in the prior art, such as CRT (Cathode Ray Tube, cathode ray tube) projectors, LCD (Liquid Crystal Display, Liquid crystal display) projector, DLP (Digital Light Processing, digital light processing technology) projector, or LCOS (Liquid Crystal On Silicon, liquid crystal on silicon) projector, etc.
  • CRT Cathode Ray Tube, cathode ray tube
  • LCD Liquid Crystal Display, Liquid crystal display
  • DLP Digital Light Processing, digital light processing technology
  • LCOS Liquid Crystal On Silicon, liquid crystal on silicon
  • the eye protection method for a projector includes:
  • S110 Obtain the first image information output by the projector 110 and the second image information projected and displayed on the projection screen 120 corresponding to the projector 110 at the same time.
  • the executor of the human eye protection method for a projector in this embodiment is the projector 110.
  • the first image information and the second image information are respectively the image information of the image output by the projector 110 and the image information of the image projected and displayed on the projection screen 120 at the same time.
  • the projector 110 includes a camera, and the second image projected and displayed on the projection screen 120 is captured by the camera to obtain the second image information.
  • S120 Compare the first image information and the second image information to determine a dark field area.
  • the first image output by the projector 110 is exactly the same as the second image projected and displayed on the projection screen 120, so the acquired first image information is the same as the first image.
  • the two image information is exactly the same; and when there is an obstruction in the projection field of the projector 110, at the same moment, due to the obstruction of the obstruction, the second image has a dark field area compared to the first image. It can be understood that, The dark field area is the projection of the obstruction on the projection screen 120. At this time, the dark field area can be determined by comparing the first image information and the second image information.
  • S130 Perform dark field processing on the image received by the projector 110 according to the dark field area, so that the brightness of the portion of the image output by the projector 110 corresponding to the dark field area is less than the brightness threshold.
  • the final image output by the projector 110 and the image received by the projector 110 are the same image, that is, when the dark field processing is not performed, the projector 110 finally The output image is the image corresponding to the first image information.
  • Performing dark field processing on the image received by the projector 110 according to the dark field area refers to reducing the brightness of the portion of the image received by the projector 110 corresponding to the dark field area, so that the brightness at the corresponding dark field area is less than the brightness threshold, so that the projector
  • the brightness of the part corresponding to the dark field area of the 110 output image will be less than the brightness threshold, so the brightness of the image projected on the obstruction will be less than the brightness threshold.
  • the obstruction is the user, it can prevent the light emitted by the projector from damaging it. vision.
  • the image displayed by the projection screen 120 will have a shadow corresponding to the dark field area, so the image received by the projector 110 is processed
  • the dark field processing does not adversely affect the content of the normal projection, that is, the method of the present application can protect the eyesight of the user without affecting the projection effect.
  • step S130 performing dark field processing on the image received by the projector 110 refers to performing dark field processing on the image originally output by the projector 110 at the next moment. It can be understood that the image received by the projector 110 at the next moment is originally to be output. The image is determined by the playback source, and may be the same image as the previously output image, or it may be different.
  • the brightness threshold can be preset by the designer. For example, the designer can obtain a brightness threshold according to a large number of experiments in advance. When the brightness of the image projected to the user's eyes does not exceed the brightness threshold, the user has no obvious feeling, and when it exceeds At this brightness threshold, the user feels dazzling and glare.
  • the color of the image output by the projector 110 corresponding to the dark field area is gray or black.
  • the premise of obtaining the first image information and the second image information in step S110 is that there are obstructions in the projection field of the projector 110.
  • detection will be performed before step S110. It is measured whether there is an obstruction in the projection field of view of the projector 110. If it is detected that there is an obstruction in the projection view of the projector 110, step S110 is executed; otherwise, dark field processing is not performed on the image received by the projector 110.
  • an infrared sensor is used to detect whether there is an obstruction in the projection field of view of the projector 110.
  • the projector 110 also includes an infrared sensor.
  • step S110 may be to obtain the first image information and the second image information in real time, or to obtain the first image information and the second image information at a certain time interval, for example, the time interval is 30 seconds, 1 minute, or 2 minutes. Wait.
  • step S110 when it is detected that there is a occlusion in the projection field of the projector 110, it is immediately determined whether the occlusion is a human face, and only when the occlusion is a human face, step S110 is executed.
  • step S130 After determining the dark field area, it is possible to determine whether the occluder is a human face. Only when the occluder is a human face, step S130 is executed. In short, this application only needs to determine the occlusion before performing dark field processing on the image received by the projector 110. Whether the object is a human face is sufficient, and the specific timing of the judgment is not limited.
  • the step of determining whether the obstruction is a human face includes:
  • A1 Use the image edge detection technology to process the second image information projected and displayed on the projection screen 120 to determine whether the obstructing object is a human head.
  • A2 When it is determined that the obstruction is a human head, image feature extraction and recognition technology is used to process the second image information displayed on the projection screen 120 to further determine whether the obstruction is a human face.
  • the image edge detection technology is used to extract the outline of the obstruction from the second image projected and displayed on the projection screen 120, and according to the outline, it can be determined whether the obstruction is a human head; when it is determined that the obstruction is a human head, the image feature extraction and Recognition technology recognizes whether the obstruction is a human face.
  • the occluder may be determined to be a human face. That is to say, in the process of determining whether the occluder is a human face, only the image edge detection technology may be used. There is no need for subsequent image feature extraction and recognition technology processing.
  • the first image information is a first image matrix
  • the second image information is a second image matrix
  • step S120 specifically includes:
  • B1 Calculate the difference between the second image matrix and the first image matrix to obtain the dark field matrix.
  • Step S130 specifically includes:
  • C1 Set the data whose value is less than the numerical threshold value in the dark field matrix to 0, and set the data whose value is greater than or equal to the numerical threshold value to 1, and then obtain the normalized dark field matrix.
  • C2 Perform an AND operation on the image matrix of the image received by the projector 110 and the normalized dark field matrix to implement dark field processing on the image received by the projector 110.
  • the first image matrix I 1 of the first image output by the projector 110 and the second image matrix I 2 of the second image projected and displayed on the projection screen 120 are acquired.
  • the distribution of non-zero values in the dark field matrix M can be calculated to determine whether the obstruction is a human face.
  • the projector 300 includes a communication circuit board 310 and a processor 320 coupled to it.
  • the communication circuit 310 is used to obtain the first image information output by the projector 300 and the second image information projected and displayed on the projection screen corresponding to the projector 300 at the same time; the processor 320 is used to compare the first image information and the second image information To determine the dark field area, the processor 320 is further configured to perform dark field processing on the image received by the projector 300 according to the dark field area, so that the brightness of the corresponding dark field area in the image output by the projector 300 is less than the brightness threshold.
  • the projector 300 includes a camera 330, which is coupled to the communication circuit 310, and the camera 330 is used to photograph the projection screen, so that the communication circuit 310 obtains the second projected display on the projection screen. 2. Image information.
  • the projector 300 further includes: an infrared sensor 340.
  • the infrared sensor 340 is coupled with the communication circuit 310 for detecting whether there is an obstruction in the projection field of the projector 300, and the communication circuit 310 is further used for when the infrared sensor 340 detects that there is an obstruction in the projection field of the projector 300, The first image information output by the projector 300 and the second image information projected and displayed on the projection screen at the same time are acquired.
  • the processor 320 is also used to determine whether the obstruction is a human face, and if the determination result is yes, the processor 320 performs dark field processing on the image received by the projector 300 according to the dark field area.
  • the processor 320 is also configured to use image edge detection technology to process the second image information projected and displayed on the projection screen to determine whether the obstruction is a human head. At the same time, when it is determined that the obstruction is a human head, the processor 320 uses The image feature extraction and recognition technology processes the second image information displayed on the projection screen to further determine whether the obstruction is a human face.
  • the first image information is a first image matrix
  • the second image information is a second image matrix
  • the processor 320 is configured to calculate the difference between the second image matrix and the first image matrix to obtain the dark field matrix, Then the data in the dark field matrix whose value is less than the numerical threshold is set to 0, and the data whose value is greater than or equal to the numerical threshold is set to 1, and then the normalized dark field matrix is obtained.
  • the image matrix of the image received by the projector 300 Performing an AND operation with the normalized dark field matrix realizes dark field processing on the image received by the projector 300.
  • the projector 300 in this embodiment executes the steps in the human eye protection method in any one of the above embodiments.
  • the detailed method please refer to the above embodiment, which will not be repeated here.
  • FIG. 4 is a schematic structural diagram of another embodiment of a projector 400 of the present application.
  • the projector 400 includes an image acquisition module 410, a dark field calculation module 420, and a dark field processing module 430.
  • the image acquisition module 410 is configured to acquire the first image information output by the projector 400 and the second image information projected and displayed on the projection screen corresponding to the projector 400 at the same time.
  • the dark field calculation module 420 is coupled to the image acquisition module 410, and is used to compare the first image information and the second image information to determine the dark field area.
  • the dark field processing module 430 is coupled to the dark field calculation module 420, and is used to perform dark field processing on the image received by the projector 400 according to the dark field area, so that the brightness of the corresponding dark field area in the image output by the projector 400 is less than the brightness Threshold.
  • the image acquisition module 410 includes a camera for shooting a projection screen, so as to acquire the second image information projected and displayed on the projection screen.
  • the projector 400 further includes an infrared detection module 440.
  • the infrared detection module 440 is coupled to the image acquisition module 410 for detecting whether there is an obstruction in the projection field of the projector 400; when the infrared detection module 440 detects that there is an obstruction in the projection field of the projector 400, the image is acquired
  • the module 410 obtains the first image information output by the projector 400 and the second image information projected and displayed on the projection screen corresponding to the projector 400 at the same time.
  • the projector 400 further includes a face detection module 450.
  • the face detection module 450 is coupled to the infrared detection module 440, and is used to determine whether the obstruction is a face; when the face detection module 450 determines that the obstruction is a face, the dark field processing module 430 receives the information from the projector 400 according to the dark field area. The image undergoes dark field processing.
  • the face detection module 450 is specifically configured to use image edge detection technology to process the second image information projected and displayed on the projection screen, and then determine whether the obstructing object is a human head;
  • image feature extraction and recognition technology is used to process the second image information displayed on the projection screen to further determine whether the obstructing object is a human face.
  • the first image information is a first image matrix
  • the second image information is a second image matrix
  • the dark field calculation module 420 calculates the difference between the second image matrix and the first image matrix to obtain the dark field matrix
  • the dark field processing module 430 sets the data in the dark field matrix whose value is less than the numerical threshold value to 0, and sets the data whose value is greater than or equal to the numerical threshold value to 1, thereby obtaining the normalized dark field matrix; at the same time, the dark field processing module 430
  • the image matrix of the image received by the projector 400 and the normalized dark field matrix are ANDed to implement dark field processing on the image received by the projector 400.
  • the projector 400 in this embodiment executes the steps in the human eye protection method in any one of the above embodiments. For details, please refer to the above embodiment, which will not be repeated here.
  • FIG. 5 is a schematic structural diagram of an embodiment of the computer-readable storage medium of the present application.
  • the computer-readable storage medium 500 includes instructions 510.
  • the instructions 510 are executed on a computer, the computer executes any of the above-mentioned methods. For detailed methods, please refer to the above-mentioned embodiments, which will not be repeated here.
  • the computer-readable storage medium 500 may be various devices such as a server, a USB flash drive, a mobile hard disk, a read-only memory (ROM, Random Access Memory), a random access memory (RAM), a magnetic disk, or an optical disk.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Transforming Electric Information Into Light Information (AREA)
  • Controls And Circuits For Display Device (AREA)

Abstract

L'invention divulgue un procédé de protection de l'œil humain pour un projecteur et un projecteur. Le procédé de protection de l'œil humain consiste à : acquérir des premières informations d'image qui sont délivrées par un projecteur et des secondes informations d'image qui sont projetées et affichées sur un écran de projection correspondant au projecteur au même moment ; comparer les premières informations d'image aux secondes informations d'image de façon à déterminer une région de champ sombre ; procéder, en fonction de la région de champ sombre, au traitement de champ sombre sur une image reçue par le projecteur, de telle sorte que la luminosité d'une partie, correspondant à la région de champ sombre, dans une image émise par le projecteur soit inférieure à une valeur seuil de luminosité. Selon le procédé de protection de l'œil humain pour un projecteur de la présente demande, la vue d'un utilisateur peut être protégée sans affecter un effet de projection.
PCT/CN2020/137105 2020-01-08 2020-12-17 Procédé de protection de l'œil humain pour projecteur et projecteur WO2021139502A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010018884.9 2020-01-08
CN202010018884.9A CN113099194A (zh) 2020-01-08 2020-01-08 用于投影仪的人眼保护方法以及投影仪

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WO2021139502A1 true WO2021139502A1 (fr) 2021-07-15

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Publication number Priority date Publication date Assignee Title
CN114697627B (zh) * 2022-06-01 2022-08-26 深圳市美特乐光电科技有限公司 用于投影仪的人眼保护方法以及投影仪

Citations (6)

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Publication number Priority date Publication date Assignee Title
JP3140252U (ja) * 2007-11-20 2008-03-21 光峰科技股▲ふん▼有限公司 目を保護する投影装置
CN104618698A (zh) * 2013-11-04 2015-05-13 中国移动通信集团公司 一种终端操控方法及装置
CN105959659A (zh) * 2016-04-28 2016-09-21 乐视控股（北京）有限公司 一种实现投影仪自适应调整的方法及投影仪
CN106709954A (zh) * 2016-12-27 2017-05-24 上海唱风信息科技有限公司 在投影区域遮罩人脸的方法
WO2017201927A1 (fr) * 2016-05-23 2017-11-30 中兴通讯股份有限公司 Dispositif et procédé anti-éblouissement, et appareil de projection
CN108600715A (zh) * 2018-04-26 2018-09-28 广东小天才科技有限公司 一种投影控制方法及投影设备

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3140252U (ja) * 2007-11-20 2008-03-21 光峰科技股▲ふん▼有限公司 目を保護する投影装置
CN104618698A (zh) * 2013-11-04 2015-05-13 中国移动通信集团公司 一种终端操控方法及装置
CN105959659A (zh) * 2016-04-28 2016-09-21 乐视控股（北京）有限公司 一种实现投影仪自适应调整的方法及投影仪
WO2017201927A1 (fr) * 2016-05-23 2017-11-30 中兴通讯股份有限公司 Dispositif et procédé anti-éblouissement, et appareil de projection
CN106709954A (zh) * 2016-12-27 2017-05-24 上海唱风信息科技有限公司 在投影区域遮罩人脸的方法
CN108600715A (zh) * 2018-04-26 2018-09-28 广东小天才科技有限公司 一种投影控制方法及投影设备

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