TWI745867B - Method for adjusting blue light components and head-mounted display - Google Patents

Abstract

The invention provides a method for adjusting blue light components and a head-mounted display. The method includes: capturing an eye image of a wearer of the head-mounted display; detecting a pupil size of the wearer of the head-mounted display based on the eye image; adjusting a blue light component of a visual content displayed to the wearer by the head-mounted display according to a variation of the pupil size.

Description

Method for adjusting blue light component and head-mounted display

The present invention relates to a visual content adjustment technology, and particularly relates to a method for adjusting blue light components and a head-mounted display.

With the development of technology, experiencing various audio-visual services (such as virtual reality (VR)) through a head mounted display (HMD) has become one of the common leisure and entertainment for modern people.

However, when the user wears the HMD, since the HMD is very close to the eyes of the user, after receiving high-intensity blue light from the HMD for a long time, it may cause a certain degree of damage to the eyes of the user.

Therefore, for those skilled in the art, how to reduce the damage of the blue light of the HMD to the eyes of the wearer is really an important issue.

In view of this, the present invention provides a method for adjusting blue light components and a head-mounted display, which can be used to solve the above technical problems.

The present invention provides a method for adjusting blue light components suitable for a head-mounted display. The method includes: capturing an eye image of a wearer of the head-mounted display; and detecting the head-mounted display based on the eye image. A pupil size of the wearer; the blue light component of a visual content displayed to the wearer by the head-mounted display is adjusted according to the change of pupil size.

The invention provides a head-mounted display, which includes an image capture circuit and a processor. The image capturing circuit captures an eye image of a wearer of the head mounted display. The processor is coupled to the image capture circuit and is configured to: detect a pupil size of the wearer of the head-mounted display according to the eye image; adjust the vision displayed by the head-mounted display to the wearer according to changes in the pupil size The blue light component of the content.

Based on the foregoing, the method for adjusting the blue light component and the head-mounted display of the present invention can reduce the damage to the wearer's eyes by the blue light component of the visual content without affecting the viewing experience of the wearer.

100: Head-mounted display

102: Image capture circuit

104: processor

S210~S220: steps

FIG. 1 is a schematic diagram of a head-mounted display according to an embodiment of the present invention.

FIG. 2 is a flowchart of a method for adjusting blue light components according to an embodiment of the present invention.

Please refer to FIG. 1, which is a schematic diagram of a head-mounted display according to an embodiment of the present invention. In different embodiments, the head-mounted display 100 is, for example, a device that can be used to provide visual content (such as various images, videos, VR content, augmented reality (AR) content, etc.) for the wearer to watch. . In addition, in different embodiments, the aforementioned visual content may be provided to the head-mounted display 100 by a computer device (such as a personal computer) connected to the head-mounted display 100 for playback for the wearer to watch.

As shown in FIG. 1, the head-mounted display 100 includes an image capturing circuit 102 and a processor 104. The image capturing circuit 102 can be any camera with a charge coupled device (CCD) lens and a complementary metal oxide semiconductor transistors (CMOS) lens.

The processor 104 can be coupled to the image capture circuit 102, and can be a general purpose processor, a special purpose processor, a traditional processor, a digital signal processor, multiple microprocessors, or a combination of one or more Digital signal processor core microprocessors, controllers, microcontrollers, Application Specific Integrated Circuit (ASIC), Field Programmable Gate Array (Field Programmable Gate Array, FPGA), any other types of products Body circuits, state machines, processors based on Advanced RISC Machine (ARM) and similar products.

In the embodiment of the present invention, the processor 104 can implement the method for adjusting the blue light component proposed by the present invention by loading a specific software module and/or program code. It will be further explained below.

Please refer to FIG. 2, which is a flowchart of a method for adjusting blue light components according to an embodiment of the present invention. The method of this embodiment can be executed by the head-mounted display 100 in FIG.

First, in step S210, the image capturing circuit 102 can capture the eye image of the wearer of the head mounted display 100.

Then, in step S220, the processor 104 may detect the pupil size of the wearer of the head mounted display 100 according to the eye image. In different embodiments, the processor 104 can detect the pupil size in the eye image based on any existing image processing technology.

After that, in step S230, the processor 104 may adjust the blue light component of the visual content displayed to the wearer by the head mounted display 100 according to the change of the pupil size.

Generally speaking, when the human eye faces a bright environment, the pupil size will shrink, while in a dark environment the pupil will enlarge. Therefore, when the visual content of the head-mounted device 100 is a high-brightness scene (for example, an outdoor daytime scene), the damage to the wearer's eyes by the brightness of the blue light at this time will be correspondingly greater. In this case, if the blue light component of the visual content can be appropriately reduced, the damage to the wearer's eyes from the blue light of the visual content can be reduced. Moreover, since the context of high-brightness visual content is considered, a moderate reduction in the blue light component will not make too many significant changes to the visual content. In other words, the above approach should be able to achieve the effect of protecting the eyes without excessively affecting the wearer's viewing experience.

Therefore, in the first embodiment, in response to detecting that the wearer's pupil size is reduced, the processor 104 can obtain the current blue light intensity of the visual content of the head mounted display 100. After that, the processor 104 can determine whether the current blue light intensity is higher than a blue light intensity lower limit, if so, the blue light component of the visual content is reduced, otherwise, the blue light component of the visual content may not be adjusted.

Specifically, if the blue light component of the visual content is excessively reduced, the visual content may appear too yellowish tones, which may affect the viewing experience of the wearer. Therefore, the designer can predetermine a blue light intensity lower limit value, which can be understood as the lowest blue light intensity value without affecting the wearer's viewing experience. That is, the processor 104 can reduce the blue light component of the visual content only when the current blue light intensity of the visual content is higher than the lower limit of the blue light intensity, so as to prevent the adjusted visual content from being too yellow and affecting the viewing experience of the wearer.

In the first embodiment, when reducing the blue light component of the visual content, the processor 104 can obtain the reduction range of the blue light component. In different embodiments, the designer can determine the aforementioned reduction range (indicated by x) according to requirements, such as 5-10, etc., but it is not limited to this. After that, the processor 104 can call an application programming interface (API) of the display card to modify the look up table (LUT) corresponding to the gamma ramp of the display card of the computer device according to the aforementioned reduction range. In the first embodiment, assuming that the RGB values of a pixel in the visual content are (r, g, b), after the blue light component of the visual content is reduced, the RGB value of this pixel can be changed to (r, g, bx), but the present invention may not be limited to this.

After that, the computer device can display the adjusted visual content through the head-mounted display The display device 100 is provided for the wearer to watch. In this way, the damage to the wearer's eyes caused by the blue light of the visual content can be reduced without affecting the wearer's viewing experience.

In other embodiments, when the visual content displayed by the head-mounted display 100 is a low-brightness scene (for example, a dark scene in the middle of the night), the damage to the eyes caused by the brightness of the blue light at this time is relatively small. Therefore, even if the blue light component is normally output in this situation, it will not cause too much burden on the wearer's eyes, and the user can fully experience the details of the dark. In addition, human eyes are more sensitive to color changes with low brightness, so the normal output of blue light in a low-brightness situation will not notice significant color distortion.

Therefore, in the second embodiment, in response to detecting that the wearer's pupil size is enlarged, the processor 104 can obtain the current blue light intensity of the visual content. After that, the processor 104 can determine whether the current light intensity is lower than the preset blue light intensity, where the preset blue light intensity may be the original blue light intensity of the visual content, but is not limited thereto. If it is determined that the current blue light intensity is lower than the preset blue light intensity, the processor 104 may increase the blue light component of the visual content, and vice versa, the blue light component of the visual content may not be adjusted. In short, the processor 104 can only increase the blue light component of the visual content to the preset blue light intensity (ie, the original blue light intensity of the visual content), so as to avoid distortion of the adjusted visual content and affect the wearer’s viewing experience. .

In the second embodiment, when adding the blue light component of the visual content, the processor 104 may first obtain the increase range of the blue light component. In different embodiments, the designer can determine the above-mentioned increase range (indicated by y) according to requirements, such as 5-10, etc., but it is not limited to this. After that, the processor 104 can call the graphics card API to modify the gamma slope look-up table corresponding to the graphics card of the computer device according to the increase range. In the second implementation In the example, assuming that the RGB value of a pixel in the visual content is (r, g, b), after the blue light component of the visual content is increased, the RGB value of this pixel can be changed to (r, g, b+y) , But the present invention may not be limited to this. After that, the computer device can provide the adjusted visual content through the head-mounted display 100 for the wearer to watch.

In other embodiments, the processor 104 may periodically perform steps S210 and S220 to dynamically adjust the blue light component of the visual content according to the pupil size detected each time, but the present invention may not be limited thereto.

In summary, the method for adjusting the blue light component and the head-mounted display of the present invention can reduce the blue light component of the visual content when the wearer's pupil size is detected to decrease, or when the wearer's pupil size is detected to be enlarged Time, increase the blue light component of the visual content. In this way, the damage to the wearer's eyes caused by the blue light component of the visual content can be reduced without affecting the wearer's viewing experience.

S210~S230: steps

Claims (6)

A method for adjusting the blue light component is suitable for a head-mounted display. The method includes: capturing an eye image of a wearer of the head-mounted display; A pupil size of the wearer; adjusting the blue light component of a visual content displayed to the wearer by the head-mounted display according to the change of the pupil size, including: obtaining the visual content in response to detecting that the pupil size is reduced In response to determining that the current blue light intensity is higher than a lower limit of blue light intensity, the blue light component of the visual content is reduced; in response to detecting that the pupil size is enlarged, a current blue light of the visual content is obtained Intensity, and in response to determining that the current blue light intensity is lower than a preset blue light intensity of the visual content, the blue light component of the visual content is increased. The method according to claim 1, wherein the visual content is provided by a computer device connected to the head-mounted display, and the step of reducing the blue light component of the visual content includes: obtaining a reduction range of the blue light component; invoking A display card application program interface is used to modify a gamma slope look-up table corresponding to a display card of the computer device according to the decrease range. The method according to claim 1, wherein the visual content is provided by a computer device connected to the head-mounted display, and the step of increasing the blue light component of the visual content includes: obtaining an increase range of the blue light component; invoking A display card application program interface is used to modify a gamma slope look-up table corresponding to a display card of the computer device according to the increase range. A head-mounted display includes: an image capture circuit that captures an eye image of a wearer of the head-mounted display; a processor coupled to the image capture circuit and configured to: Detecting a pupil size of the wearer of the head-mounted display based on the eye image; adjusting the blue light component of a visual content displayed by the head-mounted display to the wearer according to the change of the pupil size, including: reaction Upon detecting that the pupil size is reduced, obtain a current blue light intensity of the visual content, and in response to determining that the current blue light intensity is higher than a lower limit of blue light intensity, reduce the blue component of the visual content; The pupil size is enlarged to obtain a current blue light intensity of the visual content, and in response to determining that the current blue light intensity is lower than a preset blue light intensity of the visual content, the blue light component of the visual content is increased. The head-mounted display according to claim 4, wherein the visual content is provided by a computer device connected to the head-mounted display, and the processor is configured to: obtain a reduction range of the blue light component; and call a display The card application program interface modifies a gamma slope look-up table corresponding to a display card of the computer device according to the decrease range. The head-mounted display according to claim 4, wherein the visual content is provided by a computer device connected to the head-mounted display, and the processor is configured to: obtain an increase in the blue light component; call a display The card application program interface modifies a gamma slope look-up table corresponding to a display card of the computer device according to the increase range.

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