Smart glasses equipped with lenses that can control light transmittance

Abstract

To provide a smart glass which is a see-through type attachable to a field of vision of a user and controls optical transmittance of a lens according to a circumferential situation.SOLUTION: A smart glass includes: a lens 10 capable of controlling optical transmittance and having a display function of showing display information in a field of view of a user; and a controller 11 for controlling the optical transmittance of a lens according to presence or absence of appearance of display information on the lens. The control unit controls the lens so that the optical transmittance will be reduced when display information is shown in the lens and also controls the lens so that the optical transmittance will return to the initial optical transmittance after the display information is shown and a predetermined time necessary for a user to read the information passes. The smart glass includes: a camera 12 for taking a picture of the field of vision of a user; and an object recognition unit 15 for recognizing a predetermined object from the picture, and controls the optical transmittance of the lens when recognizing a predetermined object.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to smart glasses technology, and more particularly to see-through smart glasses as an augmented reality wearable computer. [Background technology]

[0002] Smart glasses are worn like eyeglasses in front of the user's (wearer's) field of vision and are equipped with a projection-type display on the lenses. Unlike virtual reality, which displays an unreal space, smart glasses display information superimposed on the wearer's field of vision in real space.

[0003] In recent years, the decline in the quality of nursing care services at elderly care facilities and medical institutions has become a social issue due to an increase in the number of people receiving care and a shortage of caregivers. In particular, caregivers need to respond differently to each care recipient. However, in facilities with many care recipients, it is natural that caregivers cannot remember all of the personal information of each care recipient (such as information on symptoms that are necessary for care).

[0004] In response to this, there is a technology in which the caregiver wears smart glasses and displays the care recipient's personal information on the lenses in a hands-free manner (see, for example, Non-Patent Document 1). With this technology, the care recipient can be identified from a facial image of the care recipient captured by the smart glasses' camera, and the care recipient's personal information can be immediately displayed on the lenses. Therefore, the care recipient does not need to wear a wireless tag or marker for personal identification.

[0005] FIG. 1 is an explanatory diagram showing the field of view through smart glasses.

[0006] For example, suppose a caregiver is wearing smart glasses 1 in a nursing home. At this time, the caregiver can see the person receiving care through the lenses of smart glasses 1, and at the same time, can see the "personal information" of the person receiving care that is projected on the lenses. This allows the caregiver to carry out care work while reading the personal information of the person receiving care hands-free.

[0007] The smart glasses 1 may be configured to store personal information in advance for each care recipient ID (standalone type), or may be configured to access a server via a network and download the information (server-client type). Examples of personal information of care recipients include the following: (basic information) Name, age, level of care required, date of birth, room number, care plan, etc. (Behavioral information) Wake-up time, meals (done / not yet), hydration (done / not yet), medication (done / not yet), excretion (yes / no), bathing (done / not yet), etc. (Transfer information) Health condition, body temperature, blood pressure (high and low), pulse, treatment information, symptoms, medical information, number of days without excretion, excretion time, abnormal excretion (yes / no), breakfast / lunch / supper time, amount of breakfast / lunch / supper amount, time of hydration, amount of fluid, time of taking medication, time of bathing, abnormal bathing (yes / no), etc.

[0008] However, as shown in Figure 1, there is a problem in that the information displayed on the lenses is very difficult to see from the perspective of the wearer (caregiver) of the smart glasses 1. Because they are see-through, black text information in particular is visually very faded. According to the technology described in Non-Patent Document 1, sunglasses are used as the lenses of the smart glasses 1.

[0009] Figure 2 is an explanatory diagram showing the field of view through smart sunglasses.

[0010] According to Figure 2, the display information projected on the lenses appears bright to the wearer (caregiver) of the smart glasses 1. This makes it easier for the caregiver wearing the smart glasses 1 to read the personal information of the care recipient. In other words, by using lenses with low light transmittance, such as sunglasses (dark), the wearer's visibility of the displayed information can be improved. [Prior art documents] [Non-patent literature]

[0011] [Non-Patent Document 1] KDDI Research, Inc. and Zenkokai Press Release "KDDI Research, Inc. and Zenkokai Develop Hands-Free Nursing Care Work Support System Using AR Glasses" (February 2, 2021), [online], [Retrieved August 30, 2021], Internet<URL:https: / / www.kddi-research.jp / newsrelease / 2021 / 020201.html> [Non-patent document 2] Ryota Tsukawaki et al., "The Effect of Wearing Glasses on Interpersonal Impressions," Hiroshima University Psychology Research, Vol. 10, 2010, [online], [Retrieved August 30, 2021], Internet <URL: https: / / ir.lib.hiroshima-u.ac.jp / files / public / 3 / 31326 / 20141016181135840232 / HPR_10_321.pdf> [Non-patent document 3] LCD light control film, [online], [searched August 30, 2021], Internet<URL:https: / / www.toppan.co.jp / electronics / new_products / lc_magic / > [Non-patent document 4] Instant photochromic sunglasses, [online], [searched August 30, 2021], Internet<URL:https: / / eshades.visionup.jp / > [Non-Patent Document 5] 0.1-second instant photochromic sunglasses, [online], [searched August 30, 2021], Internet<URL:https: / / www.wicue.jp / product / wicue01 / > Summary of the Invention [Problem to be solved by the invention]

[0012] In the case of the above-mentioned Non-Patent Document 1 (FIG. 2), from the perspective of the care recipient, the caregiver (wearer) appears to be wearing sunglasses. However, some academic papers have suggested that sunglasses "reduce social desirability and gentleness" in terms of interpersonal impressions (see, for example, Non-Patent Document 2). In particular, in nursing care facilities, care recipients may have an uneasy interpersonal impression (a sense of resistance or dislike) of caregivers wearing smart glasses, thinking, "They look scary, like they're wearing black sunglasses." One reason for this is that it is difficult for care recipients to see the caregiver's "eyes" and "gaze."

[0013] In response to this, the inventors of the present application wondered whether it would be possible to control the brightness of the lenses in accordance with the surrounding conditions of the smart glasses. That is, they wondered whether it would be possible to control the light transmittance of the lenses in the smart glasses when it is necessary to ensure that the wearer of the smart glasses can read the displayed information reliably or when it is necessary to avoid creating an uncomfortable impression on others.

[0014] Therefore, an object of the present invention is to provide smart glasses that can control the light transmittance of the lenses depending on the surrounding conditions of the smart glasses. [Means for solving the problem]

[0015] According to the present invention, there is provided a see-through smart glass that can be worn in a user's field of vision, a lens whose light transmittance can be controlled by a light control film and which has a display function of projecting display information into the user's field of vision; an integrated or externally connected camera that captures an image of the user's field of view; an object recognition means for recognizing a predetermined object from the video; Display information for the lens When a predetermined object is recognized, the light transmittance of the light control film of the lens is reduced, and when a predetermined object is recognized, the light transmittance of the light control film of the lens is increased. Control means for controlling The present invention is characterized by having the following.

[0016] According to another embodiment of the smart glasses of the present invention, The control means changes the light transmittance to a light transmittance lower than the current light transmittance when display information is projected onto the lens. 、 lens Light control film Control It is also preferred that the

[0017] According to another embodiment of the smart glasses of the present invention, The control means controls the lens to return to the original current light transmittance when a predetermined time that is readable by a user has elapsed after the display information is projected onto the lens. 、 lens Light control film Control It is also preferable.

[0019] According to another embodiment of the smart glasses of the present invention, The object recognition means detects an image area of ​​a predetermined object from the video; The control means controls the lens when the size of the image area exceeds a predetermined range. Light-control film Controlling light transmittance It is also preferable.

[0020] According to another embodiment of the smart glasses of the present invention, The object recognition means detects an image area of ​​a predetermined object from the video; The control means changes the light transmittance to a higher or lower light transmittance than the current light transmittance when the size of the image area becomes equal to or larger than a predetermined range. 、 lens Light control film Control It is also preferable.

[0021] According to another embodiment of the smart glasses of the present invention, The object recognition means recognizes a human face area as an image area. The control means changes the light transmittance to a light transmittance higher than the current light transmittance when the size of the face area becomes equal to or larger than a predetermined range. 、 lens Light control film Control It is also preferable.

[0022] According to another embodiment of the smart glasses of the present invention, The control means controls the lens so as to return the light transmittance to the original current light transmittance when the size of the face area is no longer within the predetermined range. Light control film Control It is also preferable.

[0024] According to another embodiment of the smart glasses of the present invention, Further, the device has a wireless communication means for communicating with an external device, The control means controls the light transmittance of the light control film of the lens when a predetermined signal is received from an external device. It is also preferable. In addition, as an embodiment that does not depend on the present invention described above, See-through smart glasses that can be worn in a user's field of vision, a lens whose light transmittance can be controlled; a wireless communication means capable of communicating with an external device; a control means for controlling the light transmittance of the lens when a predetermined signal is received from an external device; The present invention is characterized by having the following.

[0025] According to another embodiment of the smart glasses of the present invention, The wireless communication means receives radio waves from a wireless tag as an external device, or communicates with a wireless base station or an access point; The control means changes the light transmittance to a higher or lower light transmittance than the current light transmittance when a predetermined signal including a predetermined address or ID is received. 、 lens Light control film Control It is also preferable.

[0026] According to another embodiment of the smart glasses of the present invention, Further comprising a positioning means for detecting a current position, The control means controls the light transmittance of the light control film of the lens when the current position stays within a predetermined position range. It is also preferable. In addition, as an embodiment that does not depend on the present invention described above,See-through smart glasses that can be worn in a user's field of vision, a lens whose light transmittance can be controlled; a positioning means for detecting a current location; a control means for controlling the light transmittance of the lens when the current position stays within a predetermined position range; The present invention is characterized by having the following.

[0027] According to another embodiment of the smart glasses of the present invention, The control means controls the light transmittance of the light control film of the lens when the current time falls into a predetermined time zone. It is also preferable. In addition, as an embodiment that does not depend on the present invention described above, See-through smart glasses that can be worn in a user's field of vision, a lens whose light transmittance can be controlled; a control means for controlling the light transmittance of the lens when the current time is in a predetermined time zone; The present invention is characterized by having the following. [Effects of the Invention]

[0028] According to the smart glasses of the present invention, the light transmittance of the lenses can be controlled according to the surrounding conditions of the smart glasses. [Brief explanation of the drawings]

[0029] [Figure 1] FIG. 1 is an explanatory diagram showing the field of view through smart glasses. [Figure 2] This is an explanatory diagram showing the field of view through smart sunglasses. [Figure 3] FIG. 1 is a diagram showing the external hardware configuration of smart glasses according to the present invention. [Figure 4] FIG. 1 is a diagram illustrating a software functional configuration of smart glasses according to the present invention. [Figure 5] 10 is an explanatory diagram illustrating how the light transmittance of a lens is controlled depending on whether or not display information is displayed. FIG. [Figure 6] FIG. 10 is an explanatory diagram illustrating how the light transmittance of a lens is controlled depending on the size of a face area photographed by a camera. [Figure 7] FIG. 10 is an explanatory diagram illustrating control of the light transmittance of a lens by receiving a predetermined signal from the outside. [Figure 8] FIG. 10 is an explanatory diagram illustrating how the light transmittance of the lens is controlled depending on the position where the lens is positioned. [Figure 9] FIG. 10 is an explanatory diagram illustrating control of the light transmittance of a lens depending on the time of day. DETAILED DESCRIPTION OF THE INVENTION

[0030] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

[0031] FIG. 3 is a diagram showing the external hardware configuration of smart glasses according to the present invention. FIG. 4 is a diagram showing the software functional configuration of the smart glasses according to the present invention.

[0032] The smart glasses 1 are see-through glasses that can be worn in the user's field of vision. As shown in FIG. 3, the smart glasses 1 are equipped with a lens 10, a camera 12, a wireless communication unit 13, and a positioning unit 14 as hardware. 4, the smart glasses 1 have, as software, a control unit 11 and an object recognition unit 15. These functional components are realized by executing a program that causes a computer installed in the smart glasses to function.

[0033] [Lens 10] The lens 10 has controllable light transmittance. The lens 10 uses, for example, a liquid crystal light control film, and can increase (make transparent) or decrease (make dark) the light transmittance (see, for example, Non-Patent Documents 3 to 5). The lens 10 can change the light transmittance in accordance with a control current output from the control unit 11. The lens 10 also has a display function that projects display information into the field of view of the wearer of the smart glasses 1. This allows the wearer to visually recognize the display information. The specific range of high and low light transmittance (control range) may be separately set by the wearer of the smart glasses 1 themselves.

[0034] [Control unit 11] The control unit 11 projects display information onto the lens 10. The display information is pre-stored according to predetermined conditions and may be text, images, or video. The display information may be received and stored in advance from an external device connected to the network via the wireless communication unit 13. Furthermore, when the control unit 11 receives the display information via the wireless communication unit 13, it may project the display information onto the lens 10. According to the present invention, the control unit 11 controls the light transmittance of the lens 10 depending on whether or not display information is projected onto the lens 10.

[0035] FIG. 5 is an explanatory diagram showing how the light transmittance of the lens is controlled depending on whether or not display information is displayed.

[0036] (S1) Under normal circumstances, the lenses 10 of the smart glasses 1 have high light transmittance (transparent). The eyes and gaze of the wearer of the smart glasses 1 can be seen by other people, and the impression is not unnatural. (S2) Now, suppose that a trigger (timing) occurs to display display information on the lens 10 of the smart glasses 1. When projecting display information onto the lens 10, the control unit 11 controls the lens 10 to have a light transmittance lower than the current light transmittance. In other words, the lens 10 of the smart glasses 1 is darkened like sunglasses. Although the eyes and line of sight of the wearer of the smart glasses 1 become difficult for other people to see, it is important to enhance the visibility of the display information for the wearer for a certain period of time. (S3) After the display information is projected onto the lens 10, a predetermined time period during which the information is readable by the user has elapsed. Specifically, this is set to, for example, about 5 seconds. In other words, by minimizing the time during which the lens 10 is darkened, the uncomfortable impression on the user is reduced even if only slightly. (S4) Then, the control unit 11 controls the lens 10 to return to the original current light transmittance. The lens 10 of the smart glasses 1 is again set to high light transmittance (transparent), so that the eyes and line of sight of the wearer of the smart glasses 1 are visible to other people. Also, the display information that would have been visible to the wearer is hidden.

[0037] FIG. 6 is an explanatory diagram showing how the light transmittance of the lens is controlled depending on the size of the face area photographed by the camera.

[0038] [Camera 12] The camera 12 may be integrated with the smart glasses 1, or may be externally connected to the smart glasses 1. The camera 12 captures video of the wearer's field of vision. The video may include a person (e.g., a care recipient) or may include only an object such as facility equipment. The camera 12 constantly outputs the captured video to the object recognition unit 15.

[0039] [Object recognition unit 15] The object recognition unit 15 recognizes a predetermined object from the image captured by the camera 12. The object recognition unit 15 is a general machine learning engine that is applied to image classification and face recognition based on deep learning. It recognizes specific classes (categories such as people and objects) that appear in the video.

[0040] The object recognition unit 15 has an "image area detection function" for detecting an image area of ​​an object, and an "object detection function" for detecting an object in that image area.

[0041] <Image area detection function> The image region detection function detects the image region of a specific object from a video. This involves extracting the object region (e.g., a bounding box) from the image of the video frame. Specifically, it uses R-CNN (Regions with Convolutional Neural Networks) and SSD (Single Shot Multibox Detector). R-CNN combines rectangular object regions with convolutional neural network features to find a subset of object regions (region proposals). It then extracts CNN features from the region proposals and refines the bounding boxes of the region proposals using a support vector machine pre-trained with the CNN features. SSD is a general object detection algorithm that uses machine learning to determine rectangular bounding boxes called default boxes. Multiple default boxes of different sizes are overlaid on an image, and a predicted value is calculated for each box. For each default box, it is possible to predict its position, based on how far it is from the object and how much its size differs.

[0042] <Object detection function> The object detection function detects a predetermined object from an image area. The predetermined object may be a human body or a face, or may be an object such as a book. As an embodiment of the present invention is assumed to be used in a care setting, the object detection function recognizes a human face area from an image and identifies a user ID (identifier) ​​from the face area. The object detection function stores in advance feature amounts of the facial image of the actual user to be identified. For example, feature amounts of the facial image of a care recipient are stored as the user. The object detection function then converts the facial region, which is the extracted image area, into 128-, 256-, or 512-dimensional features (Euclidean distance) using a facial recognition model. Specifically, the Google® Facenet® algorithm can be used as the facial recognition model. This allows the facial region to be converted into a multidimensional vector feature. Then, the object recognition unit 15 compares the collected data with a set of features of the user's face, and identifies the user ID with the feature that has the shortest distance or is equal to or smaller than a predetermined threshold.

[0043] <Functions of the control unit 11 based on the object recognition unit 15> When a predetermined object is recognized by the object recognition unit 15, the control unit 11 controls the light transmittance of the lens 10 to a value higher or lower than the current light transmittance. Here, the predetermined object is assumed to be a human face.

[0044] In the case of a face area, the size of the face area reflected in the image is proportional to the distance. When the size of the face area exceeds a predetermined range, the control unit 11 controls the lens 10 to have a higher (transparent) light transmittance than the current light transmittance.

[0045] (S1) The smaller the size of the face area, the greater the distance between the subject user and the wearer. If the size of the face area is smaller than a predetermined range, the control unit 11 determines that the distance to the subject user (care recipient) is far. Even in this case, the object detection function is used to identify the user ID of the subject user from the face area. Then, display information (personal information) corresponding to the user ID is displayed in advance on the lens 10. At this time, because the distance between the subject user and the wearer is far, the light transmittance of the lens 10 may be low (dark). The wearer can read the subject user's personal information before approaching the subject user.

[0046] (S2) The larger the size of the face area, the closer the distance between the subject user and the wearer. When the size of the face area is equal to or larger than a predetermined range, the control unit 11 determines that the distance to the photographed user (care recipient) is close. In this case, the control unit 11 controls the lens 10 to have a higher light transmittance than the current light transmittance. The lens 10 of the smart glasses 1 becomes transparent (high light transmittance). In this case, when the caregiver (wearer) and the care recipient (photographed user) face each other closely, the lens 10 of the smart glasses 1 worn by the caregiver has a high light transmittance (transparent), allowing the care recipient to see the caregiver's eyes. This prevents the care recipient from feeling uncomfortable about the caregiver's interpersonal impression, as would be the case if the caregiver were wearing sunglasses.

[0047] Furthermore, when the control unit 11 determines that the distance to an object such as a book (subject) is short, it may control the lens 10 to have a higher light transmittance (transparent) than the current light transmittance. This can prevent the lens 10 from being too dark and difficult to read when reading a book, as is the case with sunglasses.

[0048] (S3) After that, when the size of the face area is no longer within the predetermined range (when the distance becomes farther), the control unit 11 controls the lens 10 to return to the original current light transmittance. When the distance to the person in the wearer's field of vision becomes farther, the smart glasses 1 may become dark like sunglasses.

[0049] In another embodiment, the display information displayed on the lens 10 of the smart glasses 1 may be information about an “object” that appears in the image captured by the camera 12.

[0050] The object recognition unit 15 has a lightweight learning model so that it can be implemented in small IoT devices. The amount of calculation is significantly reduced by selecting intermediate layer features of the trained model (deleting layers) and replacing them with a lightweight architecture. Specifically, by using a C++ Native library, it is possible to identify 10,000 people in one second, even on a small device such as smart glasses.

[0051] FIG. 7 is an explanatory diagram showing how the light transmittance of the lens is controlled by receiving a predetermined signal from the outside.

[0052] [Wireless Communication Section 13] The wireless communication unit 13 may be an interface for short-distance wireless communication, short-range wireless communication, and / or mobile phone communication, which is capable of communicating with an external device. The control unit 11 controls the lens 10 to change the light transmittance to a value higher or lower than the current light transmittance when a predetermined signal is received from an external device via the wireless communication unit 13. Here, the predetermined signal from the external device may be transmitted by a third party operating the external device.

[0053] The short-range wireless communication interface may be, for example, one that receives a wireless signal transmitted from a Bluetooth Low Energy (BLE) tag (wireless tag). The BLE tag is pre-placed at various locations within the facility where the wearer moves. For example, the wireless tag can be pre-placed at a location where the light transmittance of the lens 10 of the smart glasses 1 should be controlled.

[0054] The interface for short-range wireless communication may be one that receives wireless signals from a wireless LAN access point. A MAC (Media Access Control) address or an IP address is assigned to packets received from the access point. The predetermined signal may be a predetermined address of a data packet. The access points are assumed to be pre-installed at various locations within the facility where the wearer moves.

[0055] Furthermore, the short-range wireless communication interface may receive a predetermined signal from an external device via an access point, an access network, and the Internet. At that time, the control unit 11 controls the lens 10 to have a higher or lower light transmittance than the current light transmittance. The predetermined signal is a specific data packet sent from a terminal or server connected to the Internet.

[0056] Furthermore, the mobile phone communication interface may be one that receives push messages from a center. If the smart glasses 1 also have a telephone function like an existing smartphone, the center can send a push message to that phone number. At that point, the control unit 11 controls the lens 10 to have a higher or lower light transmittance than the current light transmittance.

[0057] Incidentally, display information may be received from a terminal or center, which is an external device connected to a mobile phone network or the Internet, via wireless communication unit 13. The received display information may be stored in control unit 11, or may be displayed on lens 10. When display information is displayed on lens 10, the present invention essentially involves control unit 11 controlling lens 10 to have a light transmittance higher or lower than the current light transmittance.

[0058] FIG. 8 is an explanatory diagram showing how the light transmittance of the lens is controlled depending on the position where the lens is positioned.

[0059] [Positioning Unit 14] The positioning unit 14 detects the current location. For example, it may receive radio waves from a GPS (Global Positioning System) to determine the position, or it may determine the position from the reception strength of radio waves from base stations and access points. In response to this, the control unit 11 controls the light transmittance of the lens when the current position stays within a predetermined position range.

[0060] In both the wireless communication unit 13 in Fig. 7 and the positioning unit 14 in Fig. 8, the control unit 11 can darken or clear the lenses 10 when the smart glasses 1 are in a predetermined position. For example, in a dark surrounding area, the lenses 10 can be forced to be clear, and in a bright surrounding area, the lenses 10 can be forced to be dark like sunglasses.

[0061] FIG. 9 is an explanatory diagram showing how the light transmittance of the lens is controlled depending on the time of day.

[0062] 9, the control unit 11 controls the light transmittance of the lens when the current time falls within a predetermined time period, thereby forcing the lens 10 to become transparent, for example, during the nighttime hours.

[0063] As described above in detail, the smart glasses of the present invention can control the light transmittance of the lenses depending on the surrounding conditions of the smart glasses. In particular, the light transmittance of the lenses in the smart glasses can be controlled when it is necessary to ensure that the wearer of the smart glasses can read displayed information reliably or when it is necessary to avoid creating an uncomfortable interpersonal impression.

[0064] Furthermore, this will, for example, "reduce the sense of discomfort felt by caregivers when wearing smart glasses," which will contribute to Goal 3 of the United Nations-led Sustainable Development Goals (SDGs), which is to "Ensure healthy lives and promote well-being for all at all ages."

[0065] With respect to the various embodiments of the present invention described above, various changes, modifications, and omissions that fall within the scope of the technical spirit and aspects of the present invention may be easily made by those skilled in the art. The above description is merely illustrative and is not intended to be limiting in any way. The present invention is limited only by the claims and their equivalents. [Explanation of symbols]

[0066] 1. Smart Glasses 10 Lenses 11 Control section 12 Camera 13 Radio Communication Department 14 Positioning unit 15 Object recognition section

Claims

1. See-through smart glasses that can be worn in a user's field of vision, a lens whose light transmittance can be controlled by a light control film and which has a display function of projecting display information into the user's field of vision; an integrated or externally connected camera that captures an image of the user's field of view; an object recognition means for recognizing a predetermined object from the video; a control means for controlling the light transmittance of the light control film of the lens to be low when display information is displayed on the lens, and to be high when a predetermined object is recognized; Smart glasses characterized by having:

2. The control means controls the light control film of the lens to have a light transmittance lower than the current light transmittance when display information is projected onto the lens. The smart glasses according to claim 1 .

3. The control means controls the light-control film of the lens so that the light transmittance is restored to the original current light transmittance when a predetermined time that is readable by the user has elapsed after the display information is projected onto the lens. The smart glasses according to claim 2 .

4. The object recognition means detects an image area of ​​a predetermined object from the video; The control means controls the light transmittance of the light control film of the lens when the size of the image area is equal to or larger than a predetermined range. The smart glasses according to any one of claims 1 to 3.

5. The object recognition means detects an image area of ​​a predetermined object from the video; The control means controls the light control film of the lens to a light transmittance higher or lower than the current light transmittance when the size of the image area exceeds a predetermined range. The smart glasses according to claim 4 .

6. The object recognition means recognizes a human face area as the image area; The control means controls the light control film of the lens to a light transmittance higher than the current light transmittance when the size of the face area is equal to or larger than a predetermined range.

6. The smart glasses according to claim 5.

7. The control means controls the light control film of the lens so that the light transmittance is restored to the original current light transmittance when the size of the face area is no longer within the predetermined range. The smart glasses according to claim 6 .

8. Further, the device has a wireless communication means for communicating with an external device, The control means controls the light transmittance of the light control film of the lens when a predetermined signal is received from an external device. The smart glasses according to any one of claims 1 to 7.

9. The wireless communication means receives radio waves from a wireless tag as an external device, or communicates with a wireless base station or an access point; The control means controls the light control film of the lens to a light transmittance higher or lower than the current light transmittance when it receives a predetermined signal including a predetermined address or ID. The smart glasses according to claim 8 .

10. Further comprising a positioning means for detecting a current position, The control means controls the light transmittance of the light control film of the lens when the current position stays within a predetermined position range.

10. Smart glasses according to any one of claims 1 to 9.

11. The control means controls the light transmittance of the light control film of the lens when the current time falls into a predetermined time zone. The smart glasses according to any one of claims 1 to 10, characterized in that

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