JP2022151109A - Dimming device - Google Patents

Abstract

To provide a dimming device which suppresses darkening in a low luminance part while adjusting a high luminance part to be dark and prevents inversion of a brightness and darkness relation for each portion.SOLUTION: A dimming device comprises: an image sensor 20; image correction means 21; a liquid crystal display 31; a liquid crystal display 32; parallax calibration means 40; transmittance control means 70; and transmittance control means 71. The parallax calibration means 40 comprises: a distance sensor 50; and a pupil sensor 60. The image sensor 20 can capture an image similar to the external field that eyeballs 11 of a user observe through the liquid crystal display 31 by imaging through the liquid crystal display 32. The parallax calibration means 40 calculates a parallax between the eyeballs of the user and the image sensor 20 to calibrate the image displayed on the liquid crystal display 31 on the basis of the calculated parallax. The distance sensor 50 detects a distance between an object 8 and the liquid crystal display 31, and the pupil sensor 60 detects a pupil position of the eyeballs 11 of the user.SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to smart sunglasses capable of adaptive light intensity adjustment for people with visual hypersensitivity.

Autism Spectrum Disorder (ASD) is one of the developmental disorders characterized by poor interpersonal relationships and strong obsessions, and is known to have atypical characteristics such as hypersensitivity. there is Among them, hypersensitivity of vision, that is, the feature of seeing things in a bright light is conspicuous.
Therefore, many people with symptoms of visual hypersensitivity wear sunglasses on a daily basis. However, general sunglasses are effective in bright places, but they become too dark in dark places, so they have to be removed, which is a problem.

Therefore, automatic dimming glasses are known that can change the transmittance of the entire lens according to the light sensor (see Non-Patent Document 1). According to the automatic dimming glasses of Non-Patent Document 1, an anti-glare effect is obtained in a bright place, and the anti-glare effect is suppressed in a dark place.
However, with the auto-dimming glasses of Non-Patent Document 1, since the auto-dimming is performed uniformly, the anti-glare effect is exhibited even in relatively dark places in the field of vision, making it difficult to see. There is

It is equipped with a liquid crystal panel that can adjust the light transmittance, a photographing device, and a light transmittance control circuit, so that the light can be adjusted not uniformly, but in the scene photographed by the photographing device. There is known a partial dimming device that extracts an appearing high-brightness portion and locally reduces the light transmittance at the location where the light path of the high-brightness portion intersects on the liquid crystal panel by a light transmittance control circuit (Patent Document 1). According to the partial dimming device of Patent Literature 1, it is possible to prevent users such as vehicle drivers from being dazzled at night or in tunnels.
However, since the partial dimming device of Patent Document 1 assumes a user such as a vehicle driver, in order to prevent dazzle from the headlights of oncoming vehicles, the light transmission of the high luminance portion on the liquid crystal panel Although the ratio can be locally reduced, it is not possible to maintain the brightness balance between high-brightness areas and other areas, and areas that are originally high-brightness appear to be lower in brightness than low-brightness areas. As a result, there is a problem that a luminance reversal phenomenon occurs.
For people with symptoms of visual hypersensitivity due to autism spectrum disorders, etc., it is necessary to maintain a normal balance between bright and dark areas, rather than simply darkening bright areas.

Also known is a device for reducing the light intensity in the field of view of the eye or optical instrument (see US Pat. The beam intensity reduction device of Patent Document 2 includes a power supply, a light sensor, a translucent lens, a user control device and a processing circuit, the processing circuit processes the generated intensity signal and, depending on the processing result, Suppose that a particular shutter element among the shutter elements is darkened so that the intensity of the rays emitted by the multiple light sources can be reduced.
However, even the light intensity reduction device of Patent Document 2 does not maintain a normal balance between bright and dark parts, so it is not suitable as a device for people with visual hypersensitivity to use in their daily lives. The problem is that it is difficult to use.

JP-A-8-122736 Japanese Patent Publication No. 11-507444

Ctrl One smart glasses auto tint to suit lighting conditions Dario Borghino July 02, 2015 (https://newatlas.com/e-tint-ctrl-one-glasses/38259/)

As described above, there has been a conventional technology for adjusting the light transmittance of a liquid crystal panel for a high-brightness portion in the field of view. However, users with visual hypersensitivity have difficulty in visually recognizing objects with high brightness, and the conventional technology does not solve the problem of overcoming these problems and increasing opportunities to go out.
In order to make the device easy to use for users with visual hypersensitivity, that is, to make the device easy to see, the high luminance portions are darkened so that they can be viewed comfortably, and the low luminance portions are not darkened and are maintained almost as they are, and , it is important that the high-low relationship of the brightness for each part is not reversed.
SUMMARY OF THE INVENTION In view of such circumstances, it is an object of the present invention to provide a light control device that darkens a high-luminance part while making it difficult for a low-luminance part to darken, and does not reverse the brightness-darkness relationship of each part.

In order to solve the above problems, a light control device of the present invention is a device for adjusting the amount of light incident on a user's eyeball from the outside world, and is a transmissive first liquid crystal display arranged in front of the user's eyeball, Based on the image sensor that captures the external world located in front of the user's eyeball and the amount of incident light for each pixel of the image sensor, the light-dark relationship for each pixel of the first liquid crystal display is not reversed, and the amount of light varies according to the amount of incident light. Transmittance control means are provided for controlling the transmittance of each pixel so as to decrease.

By providing the transmittance control means, it is possible to control the transmittance of each pixel of the first liquid crystal display based on the amount of incident light of each pixel of the image sensor. The fact that the brightness/darkness relationship for each pixel is not reversed means that the relationship between bright and dark places is not reversed by controlling the transmittance. Since the light-dark relationship of each pixel is not reversed, a more natural display becomes possible, and users with visual hypersensitivity or the like can use it comfortably without getting tired even if they use it on a daily basis.
Decreasing the amount of light according to the amount of incident light is not necessarily limited to reducing the amount of light in proportion to the amount of incident light. It is possible to control the amount of light to be reduced, and not to reduce the amount of light for slightly dark areas and dark areas.

In the light control device of the present invention, the transmittance control means maintains the transmittance of the pixels of the first liquid crystal display corresponding to the minimum amount of light or the amount of light equal to or less than a predetermined threshold among the amount of light incident on each pixel of the image sensor. It is preferable to increase the transmittance of the pixels of the first liquid crystal display corresponding to the pixels having the maximum light amount or the light amount equal to or higher than the predetermined threshold and to decrease the transmittance.
By making the transmittance of the pixels of the first liquid crystal display corresponding to the pixels with the minimum light intensity or the light intensity equal to or less than the predetermined threshold among the incident light intensity of each pixel of the image sensor unchanged or increased, dark places become darker. can be prevented and visibility is improved. In addition, by lowering the transmittance of the pixels of the first liquid crystal display corresponding to the pixels with the maximum light amount or the light amount equal to or greater than the predetermined threshold value, light can be effectively blocked in bright areas, thereby improving visibility.

In the light control device of the present invention, it is preferable that the transmittance control means calculate the transmittance using a function that satisfies the following relational expression. By calculating the transmittance using a function that satisfies the following relational expression, it is possible to adjust the brightness of the bright areas to be dark, while making it difficult for the dark areas to become dark, and to realize a well-balanced display in which the light-dark relationship of each pixel is not reversed. . In the following relational expression, E ₁ and E ₂ are pixel values of an image of the actual environment photographed through the display in a state where the first liquid crystal display is controlled to have the maximum transmittance, and satisfy E ₂ >E ₁ . E ₁ ' and E ₂ ' are pixel values of an image of the actual environment photographed through the display in a state where the first liquid crystal display is controlled to the calculated transmittance. Also, (E ₂ '/E ₂ )=(E ₁ '/E ₁ ) shall be satisfied only partially. For example, when the pixel values are in the range of 0 to 10000, all the pixel values are not controlled to have the same transmittance. consecutive pixel values are of equal transmittance, the other pixel values satisfy (E ₂ ′/E ₂ )<(E ₁ ′/E ₁ ). Note that there may be a plurality of continuous pixel values satisfying (E ₂ ′/E ₂ )=(E ₁ ′/E ₁ ).

(Number 1)
(E ₂ '/E ₂ ) ≤ (E ₁ '/E ₁ )

In the light modulation device of the present invention, a beam splitter is provided in front of the first liquid crystal display, and light from the outside world located in front of the user's eyeball is split by the beam splitter, and one of the split lights is sent to the first liquid crystal display. and an optical system in which the other split light reaches the image sensor. A half mirror can be used as the beam splitter.
A beam splitter such as a half mirror is installed in front and outside of the first liquid crystal display to split the optical path of light from the outside world. The difference between the image captured by the image sensor and the image captured by the user's eye can be reduced, and the parallax can be ignored.

Further, the light control device of the present invention includes parallax calibrating means for calculating the parallax between the user's eyeball and the image sensor, and calibrating the corresponding relationship between each pixel of the image sensor and each pixel of the first liquid crystal display based on the calculated parallax. may be further provided.
For example, if no beam splitter is provided in front of the first liquid crystal display and the image sensor is placed above the user's eyeball position, vertical parallax will occur. By providing the parallax calibrating means, even if parallax occurs between the image sensor and the eyeball of the user viewing the first liquid crystal display, the corresponding relationship between each pixel of the image sensor and each pixel of the first liquid crystal display can be calibrated. It is possible to adjust the amount of light incident on the user's eyeball from the outside world with high precision. The parallax calibrating means may perform real-time calibration when the light control device is used, or may calculate and determine an approximate parallax in advance. The parallax calibrating means can calibrate not only up and down, but also left and right, oblique directions, and front and back directions.

In the light control device of the present invention, it is preferable that the parallax calibrating means further includes a pupil sensor for detecting the position of the pupil of the user's eyeball. By providing the pupil sensor, the position of the pupil of the user's eyeball can be detected, and the parallax can be calibrated with high accuracy based on the detected information.
In the light control device of the present invention, it is preferable that the parallax calibrating means further includes a distance sensor capable of calculating the distance between an external object and the first liquid crystal display. By providing the distance sensor, the distance between an external object and the first liquid crystal display can be detected, and based on the detected information, parallax can be calibrated with high accuracy.

Preferably, the light control device of the present invention further comprises a transmissive second liquid crystal display arranged in front of the image sensor, and second transmittance control means for controlling the transmittance of each pixel of the second liquid crystal display. .
By providing the second liquid crystal display, it becomes easy to grasp the correspondence relationship between each pixel of the image sensor and each pixel of the first liquid crystal display. Also, by providing the second transmittance control means, the image sensor can capture a high dynamic range image by changing the transmittance of the second liquid crystal display.

It is preferable that the light control device of the present invention includes an image correction means for correcting blur occurring around the portion where the transmittance of the first liquid crystal display is adjusted.
When the shielding mask is generated by the first liquid crystal display and the transmittance is adjusted, the shielding mask is generated in front of the external world seen by the user through the first liquid crystal display, and therefore blurring occurs inevitably. Such a situation can be improved by providing the image correcting means. The image correcting means performs inverse calculation (inverse convolution) of the blurred portion. Specifically, a point spread function PSF that causes blurring is estimated, and a pre-corrected image is calculated by deconvolving the PSF with respect to the target transmittance-controlled image. By displaying this pre-correction image on the second liquid crystal display, a pattern close to the desired transmittance control image is captured by the image sensor as a result of the influence of the convolution of the PSF. A method using a Wiener filter or a method based on machine learning is used for deconvolution. Strictly speaking, the PSF differs for each pixel or area, so pre-correction is performed for each area and interpolated/synthesized to obtain a pre-corrected image.

In the smart sunglasses of the present invention, any one of the light control devices described above is provided in the sunglasses body, and the first liquid crystal display is arranged in front of the sunglasses body.
The sunglass body preferably has a structure similar to that of known sunglasses having ear hooks and nose hooks. It is a structure in which a light control device is provided so that the first liquid crystal display is arranged at a position corresponding to the lens portion of known sunglasses. With such a structure, it is possible for a user who has visual hypersensitivity or the like to wear it on a daily basis and effectively reduce visual stimulation.

According to the light control device of the present invention, it is possible to adjust the brightness of the high-luminance portion to be dark, while making it difficult for the low-luminance portion to become dark, and to prevent the brightness-darkness relationship of each portion from being reversed.

Functional block diagram of the light control device of Example 1 Configuration image diagram of the light control device of Example 1 Parallax image diagram Illustration of shielding mask generation Generation image diagram of shielding mask Graph showing the relationship between the amount of light before and after dimming Illustration of image correction Usage image diagram of the light control device of Example 1 Functional block diagram of the light control device of Example 2 Transmittance control flow chart Functional block diagram of the light control device of Example 3 Configuration image diagram of the light control device of Example 3

An example of an embodiment of the present invention will be described in detail below with reference to the drawings. The scope of the present invention is not limited to the following examples and illustrated examples, and many modifications and variations are possible.

FIG. 1 shows a functional block diagram of a light control device of Example 1. FIG. As shown in FIG. 1, the light control device 1 includes an image sensor 20, image correction means 21, transmissive liquid crystal displays (31, 32), parallax calibration means 40, and transmittance control means (70, 71). . The parallax calibrating means 40 also includes a distance sensor 50 and a pupil sensor 60 .
By capturing images through the liquid crystal display 32, the image sensor 20 can capture an image similar to the external world observed by the user's eyeball 11 through the liquid crystal display 31, although there is a parallax. The transmittance control means 71 can change the transmittance of the liquid crystal display 32 based on the image acquired by the image sensor 20 . This makes it possible to capture high dynamic range images.
The parallax calibrating means 40 calculates the parallax between the user's eyeball 11 and the image sensor 20, and calibrates the image displayed on the liquid crystal display 31 based on the calculated parallax. The distance sensor 50 detects the distance between the external object 8 and the liquid crystal display 31 , and the pupil sensor 60 detects the position of the pupil of the user's eyeball 11 .

The transmittance control means 70 adjusts the transmittance of the liquid crystal display 31 for each pixel by controlling the liquid crystal display 31 based on the luminance information in the image. can be adjusted to darken the Alternatively, you can brighten the more important parts of your vision and darken the less important parts.
After the parallax between the user's eyeball 11 and the image sensor 20 is calibrated by the parallax calibrating means 40, the transmittance of the image captured by the image sensor 20 is adjusted for each pixel by the transmittance control means 70. , is reflected on the liquid crystal display 31 .
The image correcting means 21 corrects the blur that occurs around the portion where the transmittance of the liquid crystal display 31 is adjusted.

FIG. 2 shows an image diagram of the configuration of the light control device of Example 1. As shown in FIG. As shown in FIG. 2, the housing 12 of the light control device 1 is provided with a scene camera 2a, a depth camera 5, a pupil detection camera 6, and liquid crystal displays (31, 32). Although not shown here, the housing 12 is further provided with a computer functioning as an image correction means 21, a parallax calibration means 40, and a transmittance control means (70, 71). , pupil detection camera 6 and liquid crystal displays (31, 32).
The scene camera 2 a functions as an image sensor 20 . The scene camera 2a and the liquid crystal display 32 are provided near the user's eyeball 11, such as the user's forehead, in order to minimize parallax with the user's eyeball 11. FIG.

The depth camera 5 is a camera with a built-in depth sensor that acquires depth information, and functions as a distance sensor 50 . A known depth camera can be used as the depth camera 5 .
The pupil detection camera 6 functions as a pupil sensor 60 . The pupil detection camera 6 detects the position of the pupil of the user's eyeball 11 and is used to calculate the vertical parallax between the scene camera 2a and the user's eyeball 11 .

3A and 3B are parallax image diagrams, where (1) shows an image captured by a scene camera and (2) shows a display image seen by a user. The object 8a in the image is a "Christmas tree" and the object 8b is a "snowman".
In the display image 9b seen from the user's eye shown in FIG. 3(2), the position 12a of the object 8a and the position 12b of the object 8b are at substantially the same height. However, since the scene camera 2a is provided at a position higher than the eyeball 11 of the user in the light adjustment device 1, the image 9a captured by the scene camera 2a shown in FIG. Also, the position 12b of the object 8b present in front is imaged at a slightly lower position.
Such parallax is calibrated using parallax calibrating means 40 .

FIG. 4 shows an explanatory diagram for generating a shielding mask. The light adjustment device 10 shown in FIG. 4 has a configuration using an eye camera 2b instead of the eyeball 11 of the user. The scene camera 2a is provided with a lens 22a and an image detector 23a, and the eye camera 2b is provided with a lens 22b and an image detector 23b.
First, as indicated by arrow 14a, the views of scene camera 2a and eye camera 2b are reliably superimposed to generate an accurate occlusion pattern. Next, as indicated by the arrow 14b, the incident light is blocked by the pixel u(u, v) of the liquid crystal display 31 so that the x(x, y) point becomes dark.

FIG. 5 is an image diagram of generation of a shielding mask, (1) is an image captured by a scene camera, (2) is a display display image before transmittance adjustment as seen by a user, (3) is a shielding mask image, ( 4) shows a display image after the transmittance adjustment as seen by the user. The shielding mask refers to a liquid crystal display whose transmittance is controlled, and the display image refers to a state in which the liquid crystal display and the background are superimposed and displayed.
As shown in FIG. 5(1), objects (8a, 8b) are captured in an image 9a captured by the scene camera 2a. Further, as shown in FIG. 5(2), objects (8a, 8b) are displayed in the display image seen by the user before the transmittance adjustment. In both FIGS. 5(1) and 5(2), the object 8a is clearly displayed, but the object 8b is too bright and difficult to see. Here, attention is focused on these two objects (8a, 8b) to explain the generation of the shielding mask.

By shooting through the liquid crystal display 32 , the scene camera 2 a can shoot an image 9 a similar to the external world observed through the liquid crystal display 31 by the user's eyeball 11 . However, as described above, since vertical parallax exists between the scene camera 2a and the user's eyeball 11, the depth camera 5 is used to detect the distance between the liquid crystal display 31 and the object (8a, 8b), and the pupil detection camera 6 is used to detect the pupil position of the user's eyeball 11, and the parallax is calibrated in real time using the parallax calibrating means 40 from the distance to the object and the pupil position.
Next, the transmittance control means 70 calculates the brightness of the objects (8a, 8b) in the calibrated image 9a and generates a shielding mask for adjusting the transmittance according to each brightness. . In the shielding mask image 9c shown in FIG. 5(3), the object 8b is shielded in substantially the same shape. On the other hand, the object 8a is not shielded. This is because the transmittance control means 70 has determined that the brightness of the object 8a in the image 9a is below a predetermined threshold. Further, if an object brighter than the object 8a and darker than the object 8b exists in the image and the brightness of the object is not determined to be below a predetermined threshold, the position of the object is also shielded. However, the transmittance is adjusted to be higher than the position corresponding to the object 8b.

A display image 9d after transmittance adjustment as seen from the user shown in FIG. As shown in FIG. 5(4), in the display image 9d, the object 8a is clearly displayed in the same way as the original image, and the object 8b is also clearly displayed by applying the shielding mask. there is

The occlusion algorithm will now be described. FIG. 6 is a graph showing the relationship between the amounts of light before and after dimming, where the vertical axis represents the target amount of light and the horizontal axis represents the original amount of light. The slope of the response curve represents the transmittance of the liquid crystal.
As shown in FIG. 6, the original image has a straight line with a gradient of 1, and the original light amount and the target light amount are the same. As the original amount of light increases, so does the target amount of light. The linear dimming is a straight line with a gradient of 0.5, and the target light amount is 1/2 (half) of the original light amount. When the original light amount increases, the target light amount increases more slowly than the original image.
In contrast, in the shading algorithm of the embodiment, as the original light amount increases, the target light amount increases parabolically. That is, it is tangent to the unmodulated function at the lowest intensity and intersects the linearly modulated function at the highest intensity. The function of the embodiment shown in FIG. 6 has a slope of 1 when the amount of light is the minimum value (0) and a transmittance of 1, and a slope of the curve when the amount of light is the maximum value (4000). 0 and a parabola with a transmittance of 1/2 is drawn.

A procedure for transmittance control will be described. FIG. 10 shows a transmittance control flow diagram. As shown in FIG. 10, first, an image before modulation is captured by the image sensor 20 (step S01). Next, in consideration of parallax, a post-transformation image (=E) is generated by transforming the photographed image into the viewpoint of the user (step S02). A target image (=E') is generated by modulating the luminance of the post-conversion image so as to satisfy the condition of the above-mentioned formula 1 (step S03). The target image is divided by the converted image to calculate the transmittance for each pixel (step S04). An input image to the liquid crystal display 31 is calculated to satisfy the calculated transmittance (step S05). The calculated input image is input to the liquid crystal display 31 (step S06).
In step S05, the relationship between the pixel value of the liquid crystal display 31 and the transmittance is obtained in advance. In this embodiment, it is measured discretely and approximated by a sigmoid function.

Next, the image correcting means will be explained. FIG. 7 is an explanatory diagram of image correction, where (1) shows a shielding mask before correction and (2) shows a shielding mask after correction.
When the user sees the outside world through the liquid crystal display 31, the liquid crystal display 31 exists in front of the outside world, so the shielding mask generated by the liquid crystal display 31 as it is has the problem that the outline of the shielding part is blurred. be. That is, as shown in FIG. 7(1), in the shielding mask image 91 before correction, a rectangular shielding portion 15a and a circular shielding portion 15b are generated. 16a and the outline 16b of the shielding portion 15b are blurred.

Therefore, the image correction means 21 is used to perform correction so that the contour of the shielded portion does not blur when viewed from the user. Specifically, the image correction means 21 estimates a point spread function PSF that causes blurring, and calculates a pre-corrected image by deconvolving the PSF with respect to the target transmittance control image. By displaying this pre-corrected image on the liquid crystal display 32, a pattern close to the desired transmittance control image is captured by the image sensor 20 as a result of the influence of the convolution of the PSF. In this embodiment, a technique using a Wiener filter is used for deconvolution. Strictly speaking, the PSF differs for each pixel or area, so pre-correction is performed for each area and interpolated/synthesized to obtain a pre-corrected image.
As a result of the correction by the image correction means 21, both the outline 16a of the shielding portion 15a and the outline 16b of the shielding portion 15b are clearly displayed in the shielding mask image 92 as shown in FIG. 7(2). there is

8A and 8B are image diagrams of the use of the light control device of Example 1, where (1) is an image captured by the scene camera, (2) is a shielding mask image, and (3) is the transmittance after adjustment as seen from the user. Display image, (4) shows a display image after transmittance adjustment by linear dimming. In both cases, the object 8c is a "dogu" and the object 8d is a "snowman".
As shown in FIG. 8(1), in the image 90a, the object 8c can be visually identified as a "dogu", but the object 8d is too bright to be identified as a "snowman". there is As shown in FIG. 8B, the shielding mask image 90c is a shielding mask generated according to the brightness of each part in the image 90a. Here, the shielding mask is generated for both the object 8c and the object 8d, but the shielding mask is generated so as to reduce the transmittance more for the object 8d than for the object 8c. there is

In the display image 90e after the transmittance is adjusted by linear dimming shown in FIG. 8(4), since the entire display is uniformly dimmed, the object 8d can be identified as a "snowman". However, on the other hand, the object 8c is too dark and cannot be identified as a "dogu".
On the other hand, in the display image 90d after the transmittance adjustment shown in FIG. 8(3), it is possible to visually recognize that the object 8c is a "dogu" and that the object 8d is also a "snowman". state. In addition, in areas other than the objects (8c, 8d), high-luminance portions are adjusted to be dark, low-luminance portions are less likely to be darkened, and a display is realized in which the light-dark relationship for each portion is not reversed.

In this way, a bright portion is extracted from an image captured by the scene camera 2a through the occlusion-ineffective liquid crystal display 32, and the light portion is darkened. By viewing the scene through this occlusion-effective liquid crystal display 31, the user can superimpose the images processed to darken the bright portions while the dark portions remain as they are.

FIG. 9 shows a functional block diagram of the light control device of the second embodiment. As shown in FIG. 9, the light control device 1a includes an image sensor 20, a transmissive liquid crystal display 31, parallax calibrating means 41, and transmittance control means .
Unlike the light modulation device 1 of the first embodiment, the image correction means 21, the liquid crystal display 32 and the transmittance control means 71 are not provided. Further, the parallax calibrating means 41 does not calibrate in real time using the distance sensor 50 and the pupil sensor 60 like the parallax calibrating means 40 of the first embodiment. Approximate parallax is calculated from the position, and predetermined calibration processing is performed in advance from the parallax.
With such a configuration, it is possible to realize a light control device that reduces visual stimulation with a relatively simple configuration.

FIG. 11 shows a functional block diagram of a light control device of Example 3. As shown in FIG. As shown in FIG. 11, the light control device 1b includes a half mirror 4, an image sensor 20, a transmissive liquid crystal display 31, and transmittance control means . Unlike the light control device 1a of the second embodiment, the half mirror 4 is provided and the parallax calibrating means 41 is not provided.

FIG. 12 shows an image diagram of the configuration of the light control device of Example 3. As shown in FIG. A scene camera 2 a shown in FIG. 12 functions as an image sensor 20 . Although the scene camera 2a is provided above the eyeball 11 of the user here, it can be provided other than above depending on the position and orientation of the half mirror 4, for example, below. Although not shown, the housing 12a of the light control device 1b is provided with a computer functioning as the transmittance control means 70, which is connected to the scene camera 2a and the liquid crystal display 31. FIG.
Of the incident light from the object 8, the light reflected by the half mirror 4 reaches the scene camera 2a, and the light transmitted through the half mirror 4 reaches the eyeball 11 of the user. Therefore, after the object 8 is imaged by the scene camera 2a, it is possible to perform transmittance control by the transmittance control means 70 without performing parallax calibration.
By adopting such a configuration, it is possible to realize a light control device that reduces visual stimulation with a simpler configuration than the light control device 1a of the second embodiment.

(Other examples)
Smart sunglasses may be produced using any one of the light control devices (1, 1a, 1b) of Examples 1 to 3. As an example of manufacturing smart sunglasses, a pair of dimming devices (1, 1a , 1b) are provided. Moreover, the structure which arrange|positions a different light control apparatus one by one on right and left among light control apparatuses (1, 1a, 1b) may be sufficient. By making smart sunglasses using the dimming device (1, 1a, 1b), a user with visual hypersensitivity can wear them on a daily basis, such as when going out, and effectively reduces visual stimulation. becomes possible.

INDUSTRIAL APPLICABILITY The present invention is useful for smart sunglasses that are worn by users with visual hypersensitivity or the like to reduce visual stimulation.

1, 1a, 1b, 10 light control device 2a scene camera 2b eye camera 4 half mirror 5 depth camera 6 pupil detection camera 8, 8a-8d object 9a, 90a image 9b, 9d, 90d, 90e display image 9c, 90c, 91, 92 shielding mask image 11 eyeball 12, 12a housing 13a, 13b position 14a, 14b arrow 15a, 15b shielding part 16a, 16b contour 20 image sensor 21 image correction means 22a, 22b lens 23a, 23b image detector 31, 32 Liquid Crystal Display 40, 41 Parallax Calibration Means 50 Distance Sensor 60 Pupil Sensor 70, 71 Transmittance Control Means

Claims (10)

A device for adjusting the amount of light incident on a user's eyeball from the outside world,
a transmissive first liquid crystal display arranged in front of the user's eyeball;
an image sensor that captures the external world positioned in front of the user's eyeball;
Based on the amount of light incident on each pixel of the image sensor, the transmittance of each pixel is controlled so that the light intensity of each pixel of the first liquid crystal display does not reverse and the amount of light decreases according to the amount of incident light. transmittance control means;
A light control device comprising: The transmittance control means maintains or increases the transmittance of the pixels of the first liquid crystal display corresponding to the pixels having the minimum light amount or the light amount equal to or less than a predetermined threshold among the incident light amount of each pixel of the image sensor, and the maximum light amount. 2. The light control device according to claim 1, wherein the transmittance of pixels of the first liquid crystal display corresponding to pixels having a light quantity equal to or greater than a predetermined threshold is reduced. The light control device according to claim 1 or 2, wherein the transmittance control means calculates the transmittance using a function that satisfies the following relational expression:
(Number 1)
(E ₂ '/E ₂ ) ≤ (E ₁ '/E ₁ )
(However, E ₁ and E ₂ are pixel values of an image of the actual environment photographed through the display in a state where the first liquid crystal display is controlled to have the maximum transmittance, and satisfy E ₂ >E ₁ . ₁ ', E ₂ ' are pixel values of an image of the actual environment photographed through the display in a state where the first liquid crystal display is controlled to the calculated transmittance, and (E ₂ '/E ₂ ) = (E ₁ '/E ₁ ) shall be satisfied only partially). A beam splitter is provided in front of the first liquid crystal display,
Light from the outside world positioned in front of the user's eyeball is split by the beam splitter, and one of the split lights enters the user's eyeball through the first liquid crystal display,
an optical system in which the other split light reaches the image sensor;
The light control device according to any one of claims 1 to 3, further comprising: Further comprising parallax calibrating means for calculating a parallax between a user's eyeball and the image sensor and calibrating a corresponding relationship between each pixel of the image sensor and each pixel of the first liquid crystal display based on the calculated parallax. The light control device according to any one of claims 1 to 4. 6. The light control device according to claim 5, wherein said parallax calibrating means further comprises a pupil sensor for detecting the pupil position of the user's eyeball. 7. The light control device according to claim 5, wherein said parallax calibrating means further comprises a distance sensor capable of calculating a distance between an external object and the first liquid crystal display. a transmissive second liquid crystal display arranged in front of the image sensor;
second transmittance control means for controlling the transmittance of each pixel of the second liquid crystal display;
The light control device according to any one of claims 1 to 7, further comprising: 9. The light control device according to claim 8, further comprising image correcting means for correcting blur that occurs around a portion where the transmittance of the first liquid crystal display is adjusted. The light control device according to any one of claims 1 to 9 is provided on the body of sunglasses,
Smart sunglasses, wherein the first liquid crystal display is arranged in front of the eye of the sunglasses body.

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