JP2015173328A - Image display device and video display method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to display a stereoscopic video that appropriately controls a stereoscopic effect of the stereoscopic video before a viewer feels fatigue and without being influenced by an environment at the time of appreciation or a physical condition.SOLUTION: A video display device includes: stereoscopic vision training means; stereoscopic effect control means; stereoscopic effect calculation means; and stereoscopic vision video creation means. The stereoscopic vision training means obtains an evaluation value representing viewer's stereoscopic vision performance. The stereoscopic effect control means determines whether to reduce a stereoscopic degree of a display video based on an input video from the evaluation value obtained by the stereoscopic vision training means, the input video, and viewing time of a stereoscopic vision video. The stereoscopic effect calculation means calculates a stereoscopic degree in accordance with the determination result of the stereoscopic effect control means. The stereoscopic vision video creation means create a stereoscopic vision video from the input video on the basis of the stereoscopic degree calculated by the stereoscopic effect calculation means.

Description

  The present invention relates to a video display device and a video display method, and more particularly to a technique suitable for use in a video display device that displays a stereoscopic video.

  Due to advances in digital technology, practical stereoscopic video display devices are becoming popular. Examples of methods for displaying stereoscopic images include a line-of-sight barrier method, a lenticular lens method, a light shielding shutter method, and a polarizing glasses method. In any of the above-described stereoscopic video display systems, a stereoscopic effect is obtained by utilizing binocular parallax and convergence, which are factors that cause humans to recognize depth.

However, the factors that make humans feel three-dimensional are not only parallax and congestion. For example, the focus adjustment function of the eyeball is also a factor that causes a three-dimensional effect. The focus adjustment function of the eyeball changes the thickness of the crystalline lens according to the distance to the object in order to obtain a clear image of the object. From the lens thickness information, the distance to the object can be obtained, which is a clue to obtaining a three-dimensional effect.
In natural vision, the position of the object recognized by parallax or convergence matches the position of the object recognized by the focus adjustment function of the eyeball, and there is no sense of incongruity.

  However, when viewing stereoscopic images on a stereoscopic image display device, the position of the object recognized by parallax or convergence is the front or back direction with respect to the display surface, whereas the object recognized by the focus adjustment function of the eyeball The position of the object is on the display surface. Here, disagreement occurs in the position information of the object, and the user feels uncomfortable. Due to this uncomfortable feeling, viewing a stereoscopic image is more fatigued than viewing a flat image.

  Therefore, a technique for reducing fatigue caused by viewing a stereoscopic image has been proposed. Patent Document 1 discloses a technique for reducing fatigue when viewing stereoscopic video by reducing the parallax of stereoscopic video if the display time of the stereoscopic video exceeds a predetermined time.

  Patent Document 2 discloses a technique for reducing the fatigue at the time of viewing a stereoscopic video by evaluating the effect of the input video on the viewer and controlling the stereoscopic degree of the stereoscopic video based on the evaluation value. ing. And patent document 3 estimates the fatigue degree of both eyes using a viewer's biological signal, and adjusts the stereoscopic degree of a three-dimensional image based on the estimated fatigue degree, so that fatigue at the time of viewing a stereoscopic image can be reduced. Disclosure techniques are disclosed.

JP 2004-165708 A JP 11-355808 A JP 09-018894 A JP 2006-106498 A

  However, there is a case where a difference in the feeling of fatigue learned when viewing a stereoscopic image is caused by the environment and physical condition at the time of viewing. Therefore, the technique for adjusting the parallax with the display time of the stereoscopic video disclosed in Patent Document 1 may not be able to reduce fatigue when viewing the stereoscopic video.

  Similarly, the fatigue reduction technique based on the input video disclosed in Patent Document 2 may not be able to reduce the fatigue when viewing a stereoscopic video. For example, if you are not feeling well, you will feel tired in a shorter viewing time. Therefore, before adjusting the three-dimensional effect, it is impossible to deny the possibility that the tiredness will be accumulated to the extent that it cannot be appreciated.

A feeling of fatigue accumulates, resulting in a change in the viewer's biological signal. Therefore, the technique for adjusting the stereoscopic degree of a stereoscopic image based on the fatigue degree of both eyes estimated using the biological signal of the viewer disclosed in Patent Document 3 is not after the viewer feels tired. There is a problem that the stereoscopic effect cannot be adjusted.
In view of the above-described problems, the present invention can display a stereoscopic image that is not affected by the environment and physical condition at the time of viewing and that appropriately controls the stereoscopic effect of the stereoscopic image before the viewer feels tired. The purpose is to do.

  The video display device of the present invention is a video display device, and includes a stereoscopic training means, a stereoscopic effect control means, a stereoscopic effect calculation means, and a stereoscopic image creation means. An evaluation value indicating a viewer's stereoscopic vision capability is acquired, and the stereoscopic effect control unit is configured to input the input value from the evaluation value acquired by the stereoscopic training unit, an input video, and a viewing time of the stereoscopic video. It is determined whether or not the stereoscopic degree of the display video based on the video should be reduced, the stereoscopic effect calculation means calculates the stereoscopic degree according to the determination result of the stereoscopic effect control means, and the stereoscopic image creation means A stereoscopic video is generated from the input video based on the stereoscopic degree calculated by the stereoscopic effect calculating means.

  According to the present invention, it is possible to view a stereoscopic image without being affected by physical condition or environment and without always feeling tired.

It is a block diagram which shows the structural example of the video display apparatus of embodiment of this invention. It is a block diagram which shows an example of the stereoscopic effect control part concerning this invention. It is a figure which shows the relationship between the imaging position of a stereoscopic vision image, a display surface, and an eyeball. It is a figure which shows an example of the stereoscopic effect adjustment operation | movement by the stereoscopic effect control part concerning this invention. It is a figure which shows a viewing position, an imaging position, and the position of the image for left eyes, and the image for right eyes.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, it is possible to change the embodiments and details without departing from the spirit and scope of the present invention. Therefore, this embodiment is not limited to the content described below. In addition, the embodiments described below may be implemented on hardware or software unless otherwise specified. In addition, the same code | symbol is attached | subjected in principle to the member which has the same function, and the repeated description is abbreviate | omitted.

Prior to the description of the embodiment of the present invention, the positional relationship between the imaging position of a stereoscopic video (stereoscopic video) and the video display device when viewing stereoscopic video will be described.
FIG. 3 shows the positional relationship between the display surface 32, the eyeball 33, and the image formation position 34 of the stereoscopic video. FIG. 3A shows the positional relationship when parallel vision is used, and FIG. 3B shows the positional relationship when cross vision is used.

When the stereoscopic video displayed on the display surface 32 is viewed with the eyeball 33, fusion occurs in the brain, and the viewer recognizes as if the image exists at the imaging position 34. In the case of parallel viewing, the imaging position 34 exists in the back direction from the display surface 32 as shown in FIG.
On the other hand, in the case of cross-viewing, the imaging position 34 exists in front of the display surface 32 as shown in FIG.
Here, the imaging distance (im) is a distance between the display surface 32 and the imaging position 34. The imaging distance (im) is expressed as a positive number with the display surface 32 set to 0 in both cases of parallel viewing and cross viewing.

[First Embodiment]
FIG. 1 is a block diagram showing a configuration example of a video display device 10 according to the first embodiment of the present invention. The video display device 10 according to the embodiment of the present invention includes at least a stereoscopic training unit 11, a stereoscopic effect control unit 12, a stereoscopic effect calculation unit 13, and a stereoscopic image creation unit 14.

  The stereoscopic training unit 11 has a function of practicing so that the viewer gets used to stereoscopic viewing, and outputs a stereoscopic training result 101. The stereoscopic training result 101 is an evaluation value indicating the viewer's stereoscopic vision ability, which is obtained from the practice state of practice that is used to stereoscopic viewing. The value of the stereoscopic training result 101 depends on the environment and the physical condition of the viewer, and does not always become the same value every time.

  Since the present invention does not depend on the practice means used to the stereoscopic used by the stereoscopic training unit 11, it can be implemented using a known technique. For example, it is possible to use the stereoscopic assistance means disclosed in Patent Document 4 as a practice means for getting used to a solid.

  An example of the stereoscopic training result 101 is shown in Table 1. In the example shown in Table 1, the stereoscopic training result 101 has four values of 1, 2, 3, and 4. Of course, the value of the stereoscopic training result 101 is not limited to these four values. The value of the stereoscopic training result 101 is 1 when the stereoscopic viewing ability is the highest. On the other hand, a state where stereoscopic viewing is impossible is set to 4. The value of the stereoscopic training result 101 is determined as shown in Table 1 depending on the state of practice of getting used to stereoscopic viewing.

  Here, the upper limit of the number of exercises may be set arbitrarily. For example, the upper limit value of the number of exercises may be determined depending on the installation location of the video display apparatus 10 according to the present embodiment or the contents of the input video. When determining depending on the contents of the input video, an upper limit value of the number of times of practice is determined in advance by the video distribution source, and distributed as an attribute value superimposed on the input video. Of course, the means for determining the upper limit of the number of exercises and the distributing means are not limited to the aforementioned means.

  The stereoscopic effect control unit 12 calculates the degree of influence of viewing the stereoscopic video on the viewer, and determines the necessity of reducing the stereoscopic degree of the display video (stereoscopic video) based on the input video based on the calculated degree of influence. To do. Then, the stereoscopic effect control signal 102 that is a signal indicating the necessity of reducing the stereoscopic effect of the stereoscopic image is generated from the determination result. The stereoscopic effect control signal 102 takes a binary value of TRUE and FALSE. When it is determined that the stereoscopic effect of the stereoscopic video should be reduced, the value (determination result) of the stereoscopic effect control signal 102 is TRUE. On the other hand, if there is no need to reduce the stereoscopic effect of the stereoscopic image, the value (determination result) of the stereoscopic effect control signal 102 is FALSE.

  FIG. 2 shows an example of the stereoscopic effect control unit 12. The configuration example of the stereoscopic effect control unit 12 illustrated in FIG. 2 includes an imaging distance extraction unit 21, a viewing time measurement unit 22, an influence degree calculation unit 23, an influence degree accumulation unit 24, a change rate calculation comparison unit 25, an influence degree accumulation. An arithmetic value comparison unit 26 and a stereoscopic effect control signal generation unit 27 are included.

  The imaging distance extraction unit 21 extracts the imaging distance (im) 111 from the input video and outputs the extraction result. When there are a plurality of imaging positions 34 in the same frame, in this embodiment, the value of the imaging distance (im) of the imaging position 34 farthest from the display surface 32 is set as the imaging distance (im) of the frame. To do.

  When the imaging distance extraction unit 21 outputs the imaging distance (im) 111 of all frames and the stereoscopic effect control unit 12 uses all the imaging distances (im) 111, the operation accuracy of the stereoscopic effect control unit 12 is the highest. become. However, the amount of data processed by the stereoscopic effect control unit 12 is the largest. Therefore, the imaging distance extraction unit 21 may widen the output interval of the imaging position (im) 111 to be output within a range where the operation accuracy of the stereoscopic effect control unit 12 is acceptable. In this case, the imaging position (im) having the largest value among the imaging positions (im) of the frames existing in the period from the output of the previous imaging position (im) 111 to the next output is output.

  For example, when the output interval of the imaging position (im) 111 is set to every 60 frames, the imaging positions (im) of 60 frames from 0 frame to 59 frames existing in the period from the previous output to the next output. Of these, the imaging position (im) having the largest value is output.

  The viewing time measuring unit 22 measures the time during which the viewer is viewing the stereoscopic video, and outputs the viewing time (at) 112. The accuracy of measuring the viewing time (at) 112 is the same as the time interval at which the imaging position extraction unit 21 outputs the imaging position (im) 111. For example, when the input video 104 has a frame rate of 60 frames per second and the imaging position (im) 111 is output once in 60 frames, the measurement accuracy of the viewing time (at) 112 is 1 second.

  The present invention does not depend on means for measuring the time during which a viewer is viewing a stereoscopic image. Therefore, the viewing time measuring unit 22 can be implemented using a known technique. For example, it is possible to use a technique of detecting the presence of a viewer in front of the video display device using a human sensor.

The viewing time measuring unit 22 implemented using this method measures the time during which the video display device displays a stereoscopic video and the viewer is present in front of the video display device, and the measurement result is obtained. The viewing time (at) is 112. Further, in the case where the video display apparatus uses a shutter-type glasses or polarized glasses to obtain a stereoscopic view, the viewing time (at) 112 is defined and measured as follows.
The video display device 10 displays a stereoscopic video, and
Time when one or more viewers wear shutter glasses or polarized glasses.

  The influence calculation unit 23 calculates and outputs an influence (ef) 113 that the stereoscopic video has on the viewer based on the imaging distance (im) 111, the viewing time (at) 112, and the stereoscopic training result 101. To do. The time interval for calculating the degree of influence (ef) 113 is the same as the accuracy of measuring the viewing time (at) 112 by the viewing time measuring unit 22. That is, the time interval for extracting the imaging position (im) 111, the measurement accuracy of the viewing time (at) 112, and the calculation interval of the influence level (ef) 113 are equal.

  Subsequently, an example of calculating the influence degree (ef) 113 will be described. Formula 1 is an example of a calculation formula for the degree of influence (ef) 113. The lower the stereoscopic vision ability is, the more easily affected by the stereoscopic video viewing. Therefore, the coefficient p and the coefficient q in Equation 1 are set to a larger value as the stereoscopic vision ability is lower. However, when the value of the stereoscopic training result 101 is 4, that is, when stereoscopic viewing is impossible, since the stereoscopic video is not output, the coefficient p and the coefficient q are not defined, and the influence level (ef) 113 is also set. Do not calculate.

Therefore, if p (m) is the value of the coefficient p when the value of the stereoscopic training result 101 is m,
p (3)> p (2)> p (1)
There is a relationship. Similarly,
q (3)> q (2)> q (1)
It is.

  The coefficient p and the coefficient q depend on the picture making of the video display device, that is, the specification as a product. When the values of the coefficient p and the coefficient q are large, the value of the influence (ef) 113 is large, and the stereoscopic effect is adjusted at an early stage. Therefore, in the case of product specifications that do not emphasize the three-dimensional effect, the values of the coefficient p and the coefficient q are increased. Table 2 shows an example of the coefficient p and the coefficient q. Of course, the values of the coefficient p and the coefficient q are not limited to the values shown in Table 2.

  The influence degree accumulation unit 24 accumulates and holds the influence degree (ef) 113. At the same time, an influence degree accumulated value (Inf) 114, which is a value obtained by accumulating the influence degree (ef) 113, is output. The influence degree accumulation unit 24 returns the influence degree accumulation value (Inf) 114 to 0 when the stereoscopic training is performed.

  The change rate calculation / comparison unit 25 obtains a change rate (ΔInf) 115 of the influence degree accumulated value 114 by dividing the increase amount of the influence degree accumulated value 114 by time, as shown in Equation 2. Here, the value of the influence accumulated value 114 at time t is Inf (t), and the value of the influence accumulated value 114 at time t + Δt is Inf (t + Δt). Here, Δt is equal to the time interval for extracting the imaging position (im) 111, the measurement accuracy of the viewing time (at) 112, and the calculation interval of the influence degree (ef) 113.

Further, the change rate calculation / comparison unit 25 compares the change rate (ΔInf) of the influence degree accumulated value 114 with the change rate threshold (Th _rc ), and outputs a change rate comparison result (CR _RC ) 115. In this embodiment, it is assumed that the comparison result (CR _RC ) 115 of the rate of change takes a binary value of TRUE and FALSE. Based on the relationship between the rate of change (ΔInf) of the influence degree accumulated value 114 and the threshold value (Th _rc ) of the rate of change, the comparison result (CR _RC ) 115 of the rate of change takes the value shown in Equation 3. Of course, the change rate comparison result (CR _RC ) 115 is not limited to binary values.

The influence degree accumulated value comparison unit 26 compares the influence degree accumulated value (Inf) 114 with the threshold value (Th _inf ) of the influence degree accumulated value and compares the influence degree accumulated value comparison result (CR _inf ) 116. Is output. In the present embodiment, it is assumed that the comparison result (CR _inf ) 116 of the influence degree accumulated value takes a binary value of TRUE and FALSE. Based on the relationship between the influence degree accumulated value (Inf) 114 and the threshold value (Th _inf ) of the influence degree accumulated value, the comparison result (CR _inf ) 116 of the influence degree accumulated value takes the value shown in _Equation 4. Of course, the comparison result (CR _inf ) 116 of the cumulative effect value is not limited to binary.

Further, based on the relationship between the influence degree accumulated value (Inf) 114 and the influence degree accumulated value threshold value (Th _inf ), the value of the influence degree accumulated value threshold value (Th _inf ) is updated to the value shown in _Formula 5. To do. Th _inf 0 is an initial value of the threshold value.

The initial value (Th _inf 0) of the threshold value of the influence degree accumulation value is set to the influence degree accumulation value (Inf) in which nobody feels fatigue. However, if the initial value (Th _inf 0) of the threshold value of the influence degree accumulation value is too small, the stereoscopic effect is adjusted more than necessary, and the appeal effect of the stereoscopic video image may be impaired.

Therefore, in this embodiment, the initial value (Th _inf 0) of the threshold value of the influence degree accumulation value is set based on the experimental result. Hereinafter, a procedure for setting the initial value (Th _inf 0) of the threshold value of the influence degree accumulation value used in the present embodiment will be described.

Step 1 Display stereoscopic images for various subjects.
At the same time, an influence degree accumulated value (Inf) 114 is acquired.
When the subject feels tired, report by pressing a button.
Step 2 If there was a report that you first felt tired,
The influence degree accumulated value (Inf) 114 is recorded.
Step 3 Step 1 to Step 2 are repeated for various stereoscopic images.
Step 4 The minimum value of the influence accumulation value (Inf) 114 recorded in Step 2 is
Inf _min .
The initial value (Th _inf 0) of the threshold value of the influence degree accumulation value is determined by _Expression 6.
Here, FS is a coefficient, and FS> 1.

When the value of the coefficient (FS) is increased, the initial value (Th _inf 0) of the threshold value of the influence degree accumulation value is decreased, and the stereoscopic vision is adjusted at an earlier stage. Conversely, if the value of the coefficient (FS) is decreased, the initial value (Th _inf 0) of the threshold value of the influence degree accumulation value is increased, and stereoscopic adjustment is performed at a later stage. Accordingly, the value of the coefficient (FS) is determined depending on the characteristics of the video display device and the product specifications of the video display device.

The stereoscopic effect control signal generation unit 27 generates the stereoscopic effect control signal 102 from the value of the change rate comparison result (CR _RC ) 115 and the influence degree accumulated value comparison result (CR _inf ) 116. In the present embodiment, a logical sum of the comparison result (CR _RC ) 115 of the change rate and the comparison result (CR _inf ) 116 of the influence degree accumulated value is calculated to generate the stereoscopic effect control signal 102. Of course, the means for generating the stereoscopic effect control signal 102 is not limited to the logical sum.

  The stereoscopic effect calculation unit 13 calculates the stereoscopic effect (3D) 103 to be given to the output image 105 from the stereoscopic training result 101, the stereoscopic effect control signal 102, and the input image 104. In the present embodiment, the stereoscopic effect (3D) 103 is represented by the imaging distance (im) of the stereoscopic video image that takes the largest value in the frame. Of course, the value representing the stereoscopic effect (3D) 103 is not limited to the imaging distance (im) of the stereoscopic image.

Next, the operation of the stereoscopic effect calculation unit 13 will be described using Equation 7. Formula 7 is an expression showing the value of the stereoscopic effect (3D) when the amount of reduction of the stereoscopic effect (3D) is quantitative. In Equation 7, 3D (n) is the value of the stereoscopic effect (3D) 103 at the viewing time n. The viewing time n is set to 0 when the stereoscopic training is finished and the display of the stereoscopic video is started. 3D ₀ is the stereoscopic effect (3D) of the input video.

If the input image 104 is stereoscopic video, the input video 104 contains information of three-dimensional effect, determine the image formation distance (im) from the information of the three-dimensional effect, a 3D _0. On the other hand, in the case of an image display device that converts a planar image into a stereoscopic image and displays it, stereoscopic effect is given from the outside at the time of conversion. Based on the three-dimensional effect of giving from the external, obtains the imaging distance (im), and 3D _0.

  As shown in Equation 7, if the value of the stereoscopic effect control signal 102 is TRUE, the stereoscopic effect calculation unit 13 subtracts the stereoscopic effect reduction amount (Δ3D) from the current stereoscopic effect (3D) 103 value to obtain a new stereoscopic effect. (3D) The value is 103.

  Subsequently, the coefficient k and the stereoscopic effect reduction amount (Δ3D) will be described. The coefficient k and the stereoscopic effect reduction amount (Δ3D) are determined depending on the stereoscopic training result 101. Table 3 shows an example of the coefficient k and the stereoscopic effect reduction amount (Δ3D).

When the value of the stereoscopic training result 101 is 1 to 2, the viewer's stereoscopic vision capability is high. Therefore, the value of the stereoscopic effect (3D) 103 at the viewing time 0, that is, the value of 3D (0) uses the stereoscopic effect 3D ₀ of the input video. Therefore, when the value of the stereoscopic training result 101 is 1 to 2, the value of the coefficient k is 1.0. Further, in the present embodiment, the stereoscopic effect reduction value of (? 3D) and 3D _0/10. Of course, not intended to limit stereoscopic effect reduction value of (? 3D) to 3D _0/10.

On the other hand, when the value of the stereoscopic training result 101 is 3, it is necessary to practice multiple times before stereoscopic viewing becomes possible, and the viewer's stereoscopic vision capability is not high. In this case, when the three-dimensional effect (3D) is large, it is easy to learn a feeling of fatigue. Therefore, the value of 3D (0) is set to a value smaller than the stereoscopic effect 3D ₀ of the input video.

In the present embodiment, the value of 3D (0) is the half of the 3D _0. Therefore, when the value of the stereoscopic training result 101 is 3, the value of the coefficient k is 0.5. Then, the value of the stereoscopic effect reduction (? 3D), is a 3D _0/20 in the present embodiment. The value of the stereoscopic effect reduction amount (Δ3D) when the value of the stereoscopic training result 101 is 3 is the value of the stereoscopic effect reduction amount (Δ3D) when the value of the stereoscopic training result 101 is 1 or more. If it is smaller than the value, it may be set to an arbitrary value.

  Furthermore, when the value of the stereoscopic training result 101 is 4, the viewer cannot perform stereoscopic viewing. In this case, a stereoscopic image is not displayed, and a planar image is always displayed. Therefore, the value of the stereoscopic effect 3D is always 0. Therefore, the value of the coefficient k is 0, and the value of the stereoscopic effect reduction amount (Δ3D) is also 0.

Next, the operation of the stereoscopic effect calculation unit 13 when the value of the stereoscopic training result 101 is other than 4 will be further described with reference to FIG.
FIG. 4A shows the relationship between the value of the stereoscopic effect (3D) 103 and the viewing time when the value of the stereoscopic training result 101 is 1. Similarly, FIG. 4B shows the value of the stereoscopic effect (3D) 103 when the value of the stereoscopic training result 101 is 2, and FIG. 4C shows the value of the stereoscopic effect (3D) 103 when the value of the stereoscopic training result 101 is 3. And the viewing time relationship.

  4A, the value of the stereoscopic effect control signal 102 is TRUE at the viewing times t2 and t4, and the value of the stereoscopic effect control signal 102 is FALSE at other viewing times. The value of the stereoscopic effect (3D) 103 is as follows.

a) Viewing time 0
3D (0) = 3D ₀ according to Equation 7 and Table 3
b) Viewing time 0 to viewing time t2
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 3D ₀ .
c) Viewing time t2
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/10 reduced _{3D (t2) = 3D 0 -3D} 0 /10=0.9*3D 0
d) Viewing time t2 to viewing time t4
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 0.9 * 3D ₀ .
e) Viewing time t4
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/10 reduced 3D (t4) = 0.9 * 3D 0 -3D 0 /10=0.8*3D 0

Next, the operation of the stereoscopic effect calculation unit 13 when the value of the stereoscopic training result 101 is 2 will be described with reference to FIG.
The value of the stereoscopic control signal 102 is TRUE at the viewing times t1, t3, and t5, and the value of the stereoscopic control signal 102 is FALSE at other viewing times. When the value of the stereoscopic training result 101 is 2, in order to adjust the stereoscopic effect at an earlier time than when the value of the stereoscopic training result 101 is 1, viewing time t1 <viewing time t2, viewing time The relationship is t3 <viewing time t4. When the value of the stereoscopic training result 101 is 2, the value of the stereoscopic effect (3D) 103 is as follows.

a) Viewing time 0
3D (0) = 3D ₀ according to Equation 7 and Table 3
b) Viewing time 0 to viewing time t1
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 3D ₀ .
c) Viewing time t1
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/10 reduced _{3D (t1) = 3D 0 -3D} 0 /10=0.9*3D 0
d) Viewing time t1 to viewing time t3
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 0.9 * 3D ₀ .
e) Viewing time t3
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/10 reduced 3D (t3) = 0.9 * 3D 0 -3D 0 /10=0.8*3D 0
f) Viewing time t3 to viewing time t5
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 0.8 * 3D ₀ .
g) Viewing time t5
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/10 reduced 3D (t5) = 0.8 * 3D 0 -3D 0 /10=0.7*3D 0

Next, the operation of the stereoscopic effect calculation unit 13 when the value of the stereoscopic training result 101 is 3 will be described with reference to FIG.
The value of the stereoscopic control signal 102 is TRUE at the viewing times t1, t3, and t5, and the value of the stereoscopic control signal 102 is FALSE at other viewing times. The procedure for calculating the degree of influence (ef) 113 is the same when the value of the stereoscopic training result 101 is 3 and when the value of the stereoscopic training result 101 is 2.

  Therefore, the stereoscopic effect (3D) is adjusted at the same time as when the value of the stereoscopic training result 101 is 2. When the value of the stereoscopic training result 101 is 3, the value of the stereoscopic effect (3D) 103 is as follows.

a) Viewing time 0
3D depending on the number 7 and Table _{3 (0) = 3D 0/} 2
b) Viewing time 0 to viewing time t1
The value of the stereoscopic effect control signal 102 for FALSE, the no change in 3D _0/2.
c) Viewing time t1
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/20 reduced _{3D (t1) = 3D 0 /} 2-3D 0 /20=0.45*3D 0
d) Viewing time t1 to viewing time t3
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 0.45 * 3D ₀ .
e) Viewing time t3
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/20 reduced 3D (t3) = 0.45 * 3D 0 -3D 0 /20=0.40*3D 0
f) Viewing time t3 to viewing time t5
Since the value of the stereoscopic effect control signal 102 is FALSE, there is no change at 0.40 * 3D ₀ .
g) Viewing time t5
The value of the stereoscopic effect control signal 102 becomes TRUE.
The number 7 and depending on the Table 3, the value of the stereoscopic effect (3D) 103 is, 3D _0/20 reduced 3D (t5) = 0.40 * 3D 0 -3D 0 /20=0.35*3D 0

Next, the operation of the stereoscopic video creation unit 14 will be described.
The stereoscopic video creation unit 14 generates an output video 105 that gives the viewer the stereoscopic effect indicated by the stereoscopic effect (3D) 103 from the input video 104. However, when the value of the stereoscopic effect (3D) 103 is 0, the stereoscopic video creation unit 14 outputs a planar video instead of a stereoscopic video.

The output video 105 will be described with reference to FIG.
FIG. 5 shows the relationship between the stereoscopic effect (3D) 103, the viewing distance L, and the movement amount d given to the left-eye video and the right-eye video.
FIG. 5A is a diagram showing a relationship in parallel viewing, and FIG. 5B is a diagram showing a relationship in cross viewing. The viewing distance L is the distance between the display surface 32 and the eyeball 33 that is most suitable for viewing and depends on the size of the display surface 32. The distance between the eyes is 6.5 cm, which is an average value.

In the case of parallel viewing, the stereoscopic effect (3D) 103, the viewing distance L, and the movement amount d have the relationship shown in Formula 8. When the input video 104 is a stereoscopic video, the left-eye video and the right-eye video are shifted so as to give the original stereoscopic effect 3D ₀ . The left-eye video and the right-eye video are created in a direction that reduces the stereoscopic effect. Therefore, in the output video 105, the input left-eye video is moved to the right and the input right-eye video is moved to the left so that the shift amount between the left-eye video and the right-eye video is 2d. The output video 105 is created.

  When the input video 104 is a plane video, the stereoscopic video creation unit 14 creates a left-eye video and a right-eye video. In this case, a left-eye video shifted by d in the left direction from the input video 104 and a right-eye video shifted by d in the right direction are created and used as the output video 105.

  Similarly, in the case of cross-viewing, the stereoscopic effect (3D) 103, the viewing distance L, and the movement amount d have the relationship shown in Expression 8. In the cross view, the left-eye image is shifted to the right and the right-eye image is shifted to the left, contrary to the parallel view. Therefore, when the input video 104 is a stereoscopic video, the input left-eye video is to the left and the input right-eye video is to the right so that the shift amount between the left-eye video and the right-eye video is 2d. The output image 105 is created by moving in the direction. When the input video 104 is a plane video, a left-eye video shifted by d in the right direction from the input video 104 and a right-eye video shifted by d in the left direction are created and used as the output video 105.

[Second Embodiment]
Next, a second embodiment for calculating the degree of influence (ef) 113 will be described.
Equation 9 is a second embodiment of the calculation formula for the degree of influence (ef) 113. In Equation 9, the function p _n (at) and the function q _n (at) are functions having the viewing time (at) 112 as an independent variable. The subscript _n of the function _pn and the function qn indicates the value of the stereoscopic training result 101. When the value of the stereoscopic training result 101 is 4, that is, when stereoscopic viewing is impossible, since the stereoscopic video is not output, the function p4 (at) and the function q4 (at) are not defined, and the influence level (ef ) 113 is not calculated.

The longer the viewing time of the stereoscopic video, the greater the effect on the viewer. Accordingly, it is assumed that the function p _n (at) and the function q _n (at) increase as the viewing time (at) 112 increases, and the condition shown in Equation 10 holds. As shown in Equation 11, if the viewing time (at) is the same, the larger the stereoscopic training result 101, that is, the smaller the stereoscopic capability, the more the function _pn (at) and the function q _n (at) Suppose the value is large.

The function p _n (at) and the function q _n (at) depend on the picture creation of the video display device, that is, the specification as a product. Therefore, according to the product specifications, the function _pn (at) and the function q _n (at) are defined so as to satisfy the expressions 10 and 11.

[Third Embodiment]
Subsequently, a second operation example of the stereoscopic effect calculation unit 13 will be described. The stereoscopic effect calculation unit 13 of the present embodiment reduces the stereoscopic effect (3D) at an equal rate. Since the stereoscopic effect (3D) decreases at an equal rate, the amount of decrease in the stereoscopic effect (3D) decreases as the viewing time of the stereoscopic video image becomes longer. Therefore, the stereoscopic effect (3D) can be adjusted more smoothly.

  The three-dimensional effect calculation unit 13 of the present embodiment calculates the three-dimensional effect (3D) using the calculation formula shown in Equation 12. Similar to the first embodiment, 3D (n) is the value of the stereoscopic effect (3D) 103 at the viewing time n. The viewing time n is set to 0 when the stereoscopic training is finished and the display of the stereoscopic video is started.

As shown in Expression 12, if the value of the stereoscopic effect control signal 102 is TRUE, the stereoscopic effect calculation unit 13 of the present embodiment multiplies the current stereoscopic effect (3D) 103 value by the stereoscopic effect reduction rate (j). This value is subtracted from the stereoscopic effect (3D) 103 to obtain a new stereoscopic effect (3D) 103 value.
Subsequently, the coefficient k in Equation 12 will be described. The coefficient k is a coefficient used to calculate the initial value 3D (0) of the stereoscopic effect (3D). The value of the coefficient k is the same as in the first embodiment.

Subsequently, the stereoscopic effect reduction rate (j) in Equation 12 will be described.
The stereoscopic effect reduction rate (j) is determined depending on the stereoscopic training result 101. When the value of the stereoscopic training result 101 is 1 to 2, the viewer's stereoscopic vision capability is high.

On the other hand, when the value of the stereoscopic training result 101 is 3, it is necessary to practice multiple times before stereoscopic viewing becomes possible, and the viewer's stereoscopic vision capability is not high. In this case, it is better to avoid a sharp decrease in stereoscopic effect (3D). Therefore, the stereoscopic effect reduction rate (j) when the value of the stereoscopic training result 101 is 3 is made smaller than the stereoscopic effect reduction rate (j) when the value of the stereoscopic training result 101 is 1 or 2.
Note that when the value of the stereoscopic training result 101 is 4, since the stereoscopic video is not displayed and the planar video is always displayed, the stereoscopic reduction rate (j) is set to 0.

  Table 4 shows an example of the coefficient k and the stereoscopic effect reduction rate (j). Of course, the values of the coefficient k and the stereoscopic effect reduction rate (j) are not limited to the values shown in Table 4. It may be arbitrarily set as long as the condition of the coefficient k described in the first embodiment and the above-described condition of the stereoscopic effect reduction rate (j) are satisfied.

(Other embodiments)
The present invention can also be realized by executing the following processing. That is, software (computer program) that implements the functions of the above-described embodiments is supplied to a system or apparatus via a network or various computer-readable storage media. Then, the computer (or CPU, MPU, etc.) of the system or apparatus reads out and executes the program.

DESCRIPTION OF SYMBOLS 10 Video display apparatus 11 Stereoscopic training part 12 Stereoscopic control part 13 Stereoscopic calculation part 14 Stereoscopic image creation part 21 Imaging distance extraction part 22 Viewing time measurement part 23 Influence degree calculation part 24 Influence degree accumulation part 25 Change rate Calculation comparison unit 26 Influence accumulation value comparison unit 27 stereoscopic effect control signal generation unit 32 display surface 33 eyeball 34 imaging position 101 stereoscopic training result 102 stereoscopic effect control signal 103 stereoscopic effect (3D)
104 Input video 105 Output video 111 Imaging distance (im)
112 Viewing time (at)
113 Influence (ef)
114 Impact value (Inf)
115 Rate of change (Δinf)
116 Comparison result (CR _inf )

Claims (8)

A video display device,
Stereoscopic training means, stereoscopic effect control means, stereoscopic effect calculation means, and stereoscopic image creation means,
The stereoscopic training means acquires an evaluation value indicating a viewer's stereoscopic vision ability,
Whether the stereoscopic effect control means should reduce the stereoscopic degree of the display video based on the input video from the evaluation value acquired by the stereoscopic training means, the input video, and the viewing time of the stereoscopic video. Determine
The stereoscopic effect calculating means calculates a stereoscopic degree according to the determination result of the stereoscopic effect control means,
The video display apparatus, wherein the stereoscopic video creation unit generates a stereoscopic video from the input video based on the stereoscopic degree calculated by the stereoscopic effect calculation unit. The stereoscopic effect control means includes an imaging distance extraction means, a viewing time measurement means, an influence degree calculation means, an influence degree accumulation means, a change rate calculation comparison means, an influence degree accumulation value comparison means, Feeling control signal generating means,
The imaging distance extracting means extracts the distance from the display surface of the video display device to the imaging position of the stereoscopic video,
The viewing time measuring means measures a time during which the viewer is viewing the stereoscopic video,
The influence degree calculating means calculates an influence degree related to fatigue of the viewer from the evaluation value acquired by the stereoscopic training means, the extraction result of the imaging distance extracting means, and the measurement result of the viewing time measuring means. ,
The influence accumulation means accumulates the influence,
The rate-of-change calculation comparing means calculates a rate of change of the cumulative value of the degree of influence, and compares the rate of change of the degree of influence with a first threshold;
The accumulated value comparing means compares the accumulated value of the influence degree with a second threshold value,
The stereoscopic effect control signal generating means generates a stereoscopic effect control signal based on the comparison result of the change rate of the influence level and the first threshold value, and the comparison result of the accumulated value of the influence degree and the second threshold value. The video display device according to claim 1, wherein:   The stereoscopic training means has a function of practicing the viewer so that the viewer gets used to stereoscopic vision, and the evaluation value indicating the viewer's stereoscopic vision ability is obtained from the implementation status of the practice to become familiar with stereoscopic vision. The video display apparatus according to claim 1, wherein the video display apparatus outputs the result.   The stereoscopic effect calculating means calculates the stereoscopic degree to be given to the output video from the evaluation value acquired by the stereoscopic training means, the stereoscopic effect control signal generated by the stereoscopic effect control means, and the input video. The video display device according to claim 1.   The stereoscopic video creation means generates a display video that gives a viewer a stereoscopic effect from the input video according to the value of the stereoscopic degree indicated by the stereoscopic effect control signal, and when the stereoscopic degree value is 0, The image display device according to claim 2, wherein a planar image is output.   The video display apparatus according to claim 1, wherein the stereoscopic effect calculation unit calculates a reduced degree of solidity at an equal rate. An image display method,
A stereoscopic training process, a stereoscopic effect control process, a stereoscopic effect calculation process, and a stereoscopic image creation process;
The stereoscopic training step acquires an evaluation value indicating the viewer's stereoscopic vision ability,
Whether the stereoscopic effect control step should reduce the stereoscopic degree of the display video based on the input video from the evaluation value acquired in the stereoscopic training step, the input video, and the viewing time of the stereoscopic video Determine
The three-dimensional effect calculation step calculates a three-dimensional degree according to the determination result of the three-dimensional effect control step,
The stereoscopic image creation step generates a stereoscopic image from the input image based on the stereoscopic degree calculated by the stereoscopic effect calculation step. A program for causing a computer to execute a video display method,
Causing a computer to execute a stereoscopic training process, a stereoscopic control process, a stereoscopic calculation process, and a stereoscopic video creation process;
The stereoscopic training step acquires an evaluation value indicating the viewer's stereoscopic vision ability,
Whether the stereoscopic effect control step should reduce the stereoscopic degree of the display video based on the input video from the evaluation value acquired in the stereoscopic training step, the input video, and the viewing time of the stereoscopic video Determine
The three-dimensional effect calculation step calculates a three-dimensional degree according to the determination result of the three-dimensional effect control step,
The stereoscopic video creation step controls the computer to generate a stereoscopic video from the input video based on the stereoscopic degree calculated by the stereoscopic effect calculation step.

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