WO2018130050A1 - Eye protection method for virtual reality head display equipment - Google Patents

Abstract

Provided is an eye protection method for virtual reality head display equipment, comprising the following steps: step S1, converting a first pixel represented by RGB color space of a stereoscopic image into a second pixel represented by YUV color space; step 2, determining a color vector on the basis of the second pixel, wherein the color vector is used to reduce a blue component B of the first pixel and increase a red component R of the first pixel and/or a green component G of the first pixel so as to adjust a luminance component Y of the second pixel to Y1, Y1 being greater than or equal to αY, and less than or equal to Y, and α being a preset constant, 0<α<1; and step S3, adding the color vector to the first pixel to obtain a toned first pixel. The eye protection method of the present invention reduces the blue component of a pixel while maintaining the luminance component, thereby achieving the effect of eyesight protection.

Description

Eye protection method for virtual reality head display device Technical field

The present invention relates to the field of virtual reality technologies, and in particular, to an eye protection method for a virtual reality head display device.

Background technique

The virtual reality head display device adopts the near-eye display technology; the stereo image light is projected onto the left and right eyes of the person to form stereoscopic vision. For virtual reality head-mounted devices, it is generally not recommended to wear them for a long time, considering the damage caused by the light generated by them.

Specifically, color images are generally presented in three primary colors of red, green, and blue, with the blue component being the strongest. High-energy blue light, which is highly susceptible to damage, has a wavelength between 380 nm and 450 nm. Studies on the effects of retinal pigments have shown that cells will lose activity when exposed to wavelengths ranging from 415 nm to 450 nm. In the long run, the probability of suffering from macular degeneration will increase greatly. These all indicate that long-term exposure of the blue light to the eyes will cause great damage to the retina, and it will induce dry eye, eye fatigue, and circadian clock disorder, which may cause macular degeneration, visual impairment or even blindness. In addition, blue light also interferes with the body's secretion of melatonin, making it difficult for people to sleep. In this case, virtual reality device providers have come up with various methods to suppress blue light. However, while suppressing blue light, the brightness of the image is degraded.

Summary of the invention

The present invention is directed to the above technical problem, and proposes an eye protection method for a virtual reality head display device.

The technical solution proposed by the present invention on the technical problem is as follows:

The invention provides an eye protection method for a virtual reality head display device, comprising the following steps:

Step S1: Converting the first pixel represented by the RGB color space of the image of the stereoscopic image into the second pixel represented by the YUV color space, Y=(0.257·R)+(0.504·G)+(0.098·B)+ 16; wherein Y is a luminance component of the second pixel; R is a red component of the first pixel; G is a green component of the first pixel; and B is a blue component of the first pixel;

Step S2, determining a color vector based on the second pixel; the color vector is for reducing the blue component B of the first pixel, and increasing the red component R of the first pixel and/or the green component G of the first pixel, thereby The luminance component Y of the pixel is adjusted to Y1; wherein Y1 is greater than or equal to αY and less than or equal to Y; α is a preset constant, 0<α<1;

Step S3, adding the color vector to the first pixel, thereby obtaining the first pixel after the coloring.

In the above-described eye protection method of the present invention, in step S2, the color vector is used to adjust the blue component B of the first pixel to B·b, and the red component R of the first pixel is adjusted to R·r, and The green component G of one pixel is adjusted to G·g; wherein 0<b<1; at least one of r and g is greater than 1; b is a preset blue adjustment coefficient, r is a red adjustment coefficient, and g is a green adjustment coefficient .

In the above-mentioned eye protection method of the present invention, the step S3 further includes: performing a truncation process on the toned first pixel, the truncation function of the truncation process is:

R'=cut(R·r)

G'=cut(G·g)

B'=B·b

Where R' is the red component of the first pixel after being subjected to the coloring and truncation processing;

G' is the green component of the first pixel after being subjected to the coloring and truncation processing;

B' is the blue component of the first pixel after being subjected to the coloring and truncation processing;

R is the red component of the first pixel;

G is the green component of the first pixel;

B is the blue component of the first pixel;

r is the red adjustment factor;

g is the green adjustment factor;

b is the preset blue adjustment factor.

In the above-mentioned eye protection method of the present invention, the step S2 further includes:

Set the scale factor a, g=r·a; give the value of the red adjustment factor r in [1, r _max ];

r _max = (0.859-0.98·b) / (0.257 + 0.504 · a);

r is the red adjustment factor;

g is the green adjustment factor;

b is the preset blue adjustment factor.

In the above-mentioned eye protection method of the present invention, before the step S1, the eye protection method further comprises:

Step S101: Calculate a sum of blue light components of all the first pixels of the image of the stereoscopic image, determine whether the sum of the blue light components is smaller than a preset blue light component sum threshold, and if yes, stop performing step S1 - step S3; if not, execute step S1 -Step S3.

In the above-mentioned eye protection method of the present invention, the stereoscopic image includes a first image and a second image, and there is a parallax between the first image and the second image, and the first image and the second image are respectively projected into the left and right eyes of the user; Step S1 - Step S3 is defined as a blue suppression process. Before step S1, the eye protection method further includes:

The blue suppression process is performed only for one of the first image and the second image during the same period of time.

In the above eye protection method of the present invention, the eye protection method further comprises: performing a blue suppression process on the first image and the second image alternately.

In the above-mentioned eye protection method of the present invention, the stereoscopic image includes a first image and a second image, and there is a parallax between the first image and the second image, and the first image and the second image are respectively projected into the left and right eyes of the user; Step S1 - step S3 of preset blue adjustment coefficient b > 0.7 is defined as a blue weak suppression process, and step S1 - step S3 of preset blue adjustment coefficient b < 0.5 is defined as a blue strong suppression process; include:

The blue weak suppression process and the blue strong suppression process are alternately performed on the first image or the second image.

In the above-mentioned eye protection method of the present invention, the stereoscopic image includes a first image and a second image, and there is a parallax between the first image and the second image, and the first image and the second image are respectively projected into the left and right eyes of the user; Step S1 - Step S3 of preset blue adjustment coefficient b < 0.5 is defined as a blue strong suppression process; the eye protection method further includes:

The blue strong suppression process is performed and not performed on the first image or the second image alternately.

The eye protection method of the present invention converts a first pixel represented by an RGB color space into a second pixel represented by a YUV color space, Y = (0.257 · R) + (0.504 · G) + (0.098 · B) + 16 And then determining a color vector based on the second pixel; the color vector is for lowering the blue component B, and raising the red component R and/or the green component G, and stabilizing the luminance component Y within a certain range; then, The color vector is summed with the first pixel to obtain the first pixel after the coloring. This technical idea can reduce the blue component of the pixel while maintaining the brightness component, thereby achieving the effect of protecting vision.

DRAWINGS

The present invention will be further described below in conjunction with the accompanying drawings and embodiments, in which:

Fig. 1 is a schematic view showing a flow chart of an eye protection method according to a first embodiment of the present invention.

detailed description

The technical problem to be solved by the present invention is that existing virtual reality device providers have come up with various methods to suppress blue light, however, while suppressing blue light, the brightness of the image is degraded. The technical idea proposed by the present invention on the technical problem is to convert a first pixel represented by an RGB color space into a second pixel represented by a YUV color space, Y=(0.257·R)+(0.504·G)+( 0.098·B)+16; then, determining a color vector based on the second pixel; the color vector is for lowering the blue component B, and raising the red component R and/or the green component G, and stabilizing the luminance component Y within a certain range Then, the color vector is added to the first pixel to obtain the first pixel after the coloring. This technical idea can reduce the blue component of the pixel while maintaining the brightness component, thereby achieving the effect of protecting vision.

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

First embodiment

As shown in Fig. 1, Fig. 1 is a schematic view showing a flow chart of an eye protection method according to a first embodiment of the present invention. Specifically, the eye protection method for the virtual reality head display device provided by the embodiment includes the following steps:

Step 100: Convert a first pixel represented by an RGB color space of the image of the stereoscopic image into a second pixel represented by a YUV color space, where Y=(0.257·R)+(0.504·G)+(0.098·B +16; wherein Y is a luminance component of the second pixel; R is a red component of the first pixel; G is a green component of the first pixel; and B is a blue component of the first pixel;

Step 200: Determine a color vector based on the second pixel; the color vector is used to reduce the blue component B of the first pixel, and increase the red component R of the first pixel and/or the green component G of the first pixel, thereby The luminance component Y of the pixel is adjusted to Y1; wherein Y1 is greater than or equal to αY and less than or equal to Y; α is a preset constant, 0 < α < 1; preferably, α can take a value within [0.8, 1).

Step 300, summing the color vector with the first pixel, thereby obtaining the first pixel after the coloring.

In the above embodiment, by setting the Y1 between αY and Y by the color vector, it is possible to stabilize the luminance of the image of the stereoscopic image within a certain range while suppressing the blue component.

Further, in step 200, the color vector is used to adjust the blue component B of the first pixel to B·b, the red component R of the first pixel to R·r, and the green component G of the first pixel. Adjusted to G·g, where 0<b<1; at least one of r and g is greater than 1; b is the preset blue adjustment coefficient, r is the red adjustment coefficient, and g is the green adjustment coefficient.

The step 300 further includes: performing a truncation process on the toned first pixel, the truncation function of the truncation process is:

R'=cut(R·r)

G'=cut(G·g)

B'=B·b

Where R' is the red component of the first pixel after being subjected to the coloring and truncation processing;

G' is the green component of the first pixel after being subjected to the coloring and truncation processing;

B' is the blue component of the first pixel after being subjected to the coloring and truncation processing;

R is the red component of the first pixel;

G is the green component of the first pixel;

B is the blue component of the first pixel;

r is the red adjustment factor;

g is the green adjustment factor;

b is the preset blue adjustment factor.

By the truncation process, the red component and the green component of the first pixel after the toning and truncation processing are not more than 255.

Further, the step 300 further includes: displaying the first pixel after the toning and truncation processing by using the virtual reality head display device.

Further, the step 200 further includes: setting a proportional coefficient a, g=r·a; in the embodiment, taking a=1, such that g=r; thus, when the blue component is suppressed, the red component and the green The light component is synchronously compensated for the luminance component; in other embodiments, if the pixel tone is desired to be greenish, a>1 may be taken; if the pixel tone is desired to be reddish, a<1 may be taken.

Further, in the embodiment, since Y1 is less than or equal to Y, there are:

(0.257·R·r)+(0.504·G·r·a)+(0.098·B·b)≤(0.257·R)+(0.504·G)+(0.098·B)

Take a white palette to adjust the brightness, that is, let R = G = B, then:

(0.257·r)+(0.504·r·a)+(0.098·b)≤0.257+0.504+0.098

R≤(0.859-0.98·b)/(0.257+0.504·a)

Let r _max = (0.859-0.98·b) / (0.257 + 0.504 · a), then r ≤ r _max .

Based on the above calculation result, in step 200, the red adjustment coefficient r is taken in [1, r _max ].

Further, before step 100, the eye protection method further includes:

Calculating a sum of blue light components of all the first pixels of the image of the stereo image, determining whether the sum of the blue light components is less than a preset threshold value of the preset blue light component, and if so, stopping performing steps 100 - 300; if not, performing step 100 - step 300 . With the eye protection method of the first embodiment, the overall picture of the image may be yellowish.

Second embodiment

The second embodiment is implemented based on the first embodiment. Specifically, the stereoscopic image includes a first image and a second image. There is a parallax between the first image and the second image, and the first image and the second image are used to respectively Projected into the left and right eyes of the user, so that the user can experience the stereoscopic effect of the stereoscopic image. Step 100-step 300 is defined as a blue suppression process. Before step 100, the eye protection method further includes:

The blue suppression process is performed only for one of the first image and the second image during the same period of time.

Preferably, the eye protection method further comprises: performing a blue suppression process on the first image and the second image alternately. Here, the time period during which the blue suppression process is performed on the first image and the time period in which the blue suppression process is performed on the second image may be different or the same. In this way, it is possible to suppress only the blue light of the left eye for a period of time, and only suppress the blue light of the right eye for another period of time, so that one eye can always see a blue image that is better, and the final synthesis of the binocular vision. Better color protection can be obtained, and the blue light is absorbed from the eye by the cumulative effect; in addition, the color effect of the method is better than that of the simple anti-blue light coating and the simple full-screen blue light pressing.

Third embodiment

The third embodiment is implemented based on the first embodiment. Specifically, the stereoscopic image includes a first image and a second image, and a parallax exists between the first image and the second image, and the first image and the second image are respectively projected into the left and right eyes of the user, so that the user experiences the stereo image. The stereo effect. Step 100-step 300 of preset blue adjustment coefficient b>0.7 is defined as blue weak suppression process, and step 100-step 300 of preset blue adjustment coefficient b<0.5 is defined as blue strong suppression process; eye protection method Also includes:

The blue weak suppression process and the blue strong suppression process are alternately performed on the first image or the second image.

Here, the execution time period of the blue weak suppression process and the execution time period of the blue strong suppression process may be different or the same.

Alternatively, the eye protection method further includes:

The blue strong suppression process is performed and not performed on the first image or the second image alternately.

Here, the execution time period of the blue strong suppression process and the non-execution time period of the blue strong suppression process may be different or the same.

The eye protection method of the third embodiment can improve the eye comfort of the user. The alternating frequency of the blue weak suppression process and the blue strong suppression process, or the alternating frequency of the execution and non-execution of the blue strong suppression process, the human eye does not feel the picture is beating, the overall picture will be yellowish, but the image brightness It will be brighter.

It is to be understood that those skilled in the art will be able to make modifications and changes in accordance with the above description, and all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (9)

An eye protection method for a virtual reality head display device, comprising the steps of: Step S1: Converting the first pixel represented by the RGB color space of the image of the stereoscopic image into the second pixel represented by the YUV color space, Y=(0.257·R)+(0.504·G)+(0.098·B)+ 16; wherein Y is a luminance component of the second pixel; R is a red component of the first pixel; G is a green component of the first pixel; and B is a blue component of the first pixel; Step S2, determining a color vector based on the second pixel; the color vector is for reducing the blue component B of the first pixel, and increasing the red component R of the first pixel and/or the green component G of the first pixel, thereby The luminance component Y of the pixel is adjusted to Y1; wherein Y1 is greater than or equal to αY and less than or equal to Y; α is a preset constant, 0<α<1; Step S3, adding the color vector to the first pixel, thereby obtaining the first pixel after the coloring. The eye protection method according to claim 1, wherein in step S2, the color vector is used to adjust the blue component B of the first pixel to B·b, and the red component R of the first pixel is adjusted to R. r, and adjust the green component G of the first pixel to G·g; wherein 0<b<1; at least one of r and g is greater than 1; b is a preset blue adjustment coefficient, and r is a red adjustment coefficient , g is the green adjustment factor. The eye protection method according to claim 2, wherein the step S3 further comprises: performing a truncation process on the toned first pixel, the truncation function of the truncation process is: R'=cut(R·r) G'=cut(G·g) B'=B·b

Where R' is the red component of the first pixel after being subjected to the coloring and truncation processing; G' is the green component of the first pixel after being subjected to the coloring and truncation processing; B' is the blue component of the first pixel after being subjected to the coloring and truncation processing; R is the red component of the first pixel; G is the green component of the first pixel; B is the blue component of the first pixel; r is the red adjustment factor; g is the green adjustment factor; b is the preset blue adjustment factor. The eye protection method according to claim 2, wherein the step S2 further comprises: Set the scale factor a, g=r·a; give the value of the red adjustment factor r in [1, r _max ]; r _max = (0.859-0.98·b) / (0.257 + 0.504 · a); r is the red adjustment factor; g is the green adjustment factor; b is the preset blue adjustment factor. The eye protection method according to claim 1, wherein before the step S1, the eye protection method further comprises: Step S101: Calculate a sum of blue light components of all the first pixels of the image of the stereoscopic image, determine whether the sum of the blue light components is smaller than a preset blue light component sum threshold, and if yes, stop performing step S1 - step S3; if not, execute step S1 -Step S3. The eye protection method according to claim 1, wherein the stereoscopic image comprises a first image and a second image, and a parallax exists between the first image and the second image, and the first image and the second image are respectively used to project to In the left and right eyes of the user; step S1 - step S3 is defined as a blue suppression process, and before step S1, the eye protection method further includes: The blue suppression process is performed only for one of the first image and the second image during the same period of time. The eye protection method according to claim 6, wherein the eye protection method further comprises: performing a blue suppression process on the first image and the second image alternately. The eye protection method according to claim 2, wherein the stereoscopic image comprises a first image and a second image, and a parallax exists between the first image and the second image, and the first image and the second image are respectively projected to In the left and right eyes of the user; step S1 - step S3 in which the preset blue adjustment coefficient b > 0.7 is defined as a blue weak suppression process, and step S1 - step S3 in which the preset blue adjustment coefficient b < 0.5 is defined as blue strong suppression Process; eye protection methods also include: The blue weak suppression process and the blue strong suppression process are alternately performed on the first image or the second image. The eye protection method according to claim 2, wherein the stereoscopic image comprises a first image and a second image, and a parallax exists between the first image and the second image, and the first image and the second image are respectively projected to In the left and right eyes of the user; the step S1 - step S3 of the preset blue adjustment coefficient b < 0.5 is defined as a blue strong suppression process; the eye protection method further includes: The blue strong suppression process is performed and not performed on the first image or the second image alternately.

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