KR101535714B1 - Display system where the information can be seen only by the viewer wearing the special eyeglasses - Google Patents

Abstract

The present invention provides a display device and an image processing method. This image processing method comprises the steps of preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and luminance (Lr ^t , Lg ^t , Lb ^t ) of the information image and synthesizing the original image and the information image (Lr ¹ , Lg ¹ , Lb ¹ ) of the first image and the luminance (Lr ² , Lg ² , Lb ² ) of the ^second image are the same as the luminance of the original image It is a predetermined multiple.

Description

[0001] The present invention relates to a display system in which only observers wearing special glasses can view information,

The present invention relates to a display, and more particularly, to a display system that provides different images to a user who wears special glasses and a user who does not wear special glasses by utilizing a conventional spectacled 3D display.

The still image signal can be interpreted as a two-dimensional signal. The still image signal is composed of a point called a pixel, which stores data containing color information at each position. It is the still image signal that these pixel data are arranged in the horizontal and vertical directions.

The video signal indicates that the still video signal varies with time.

Monochrome uses black, white, and the gray value of its middle value. For example, in the case of a video signal representing 16 levels of contrast, 4 bits of data are required to represent one pixel.

Color images generally use 24-bit data per pixel. These 24 bits are divided into 8 bits allocated to RGB colors. Therefore, the capacity of 24 bits x 320 x 240 = 230.4KB is required to represent a 320x240 color image.

The most basic file format for representing pictures in this way is a bitmap file. In addition to these image data, the bitmap file is further supplemented with various information headers necessary for describing the file, for example, a method of displaying the size and color of the image data. JPG, GIF, TIF, and other file formats compress the bitmap data to reduce the capacity.

Each pixel consists of R, G, and B subpixels, and each subpixel is typically represented by 8 bits. Each subpixel is represented by a graylevel ranging from 0 to 255. Therefore, the color image is composed of (M x N) pixels.

Polarized 3D systems use polarization glasses to induce illusion of three-dimensional images. To display a stereoscopic image, two images having different polarizations are simultaneously projected on the same screen. Observers wear polarizing glasses that include a pair of filters with different polarizations. Each filter transmits polarized light in the same direction and blocks polarized light in the opposite direction. Thus, the left and right eyes see different images. Different pairs of images are projected to both eyes, and the viewer's brain recognizes stereoscopic images through 3D illusion.

The shutter 3D system intercepts light entering the right eye, transmits the image for the left eye, and then blocks light incident on the left eye and transmits the image for the right eye. Repeating this operation, the left eye sees only the image for the left eye, and the right eye sees only the image for the right eye. The observer's brain recognizes stereoscopic images by composing images for the right eye and images for the left eye. To this end, the shutter type 3D display periodically displays a first frame for the left eye and a second frame for the right eye at a time when the first frame is not displayed. The left shutter of the shutter type eyeglasses is synchronized with the first frame to transmit only the first frame for the left eye and the right shutter is synchronized with the second frame to transmit only the second frame for the right eye.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems occurring in the prior art.

The image processing method according to an embodiment of the present invention includes the steps of preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of an original image and luminance (Lr ^t , Lg ^t , Lb ^t ) (Lr ¹ , Lg ¹ , Lb ¹ ) of the first image and the luminance Lr ² , Lg (Lg ¹ , Lb ¹ ) of the second image by synthesizing the information image and the first image and the second image, ² , Lb ² ) is a predetermined multiple of the luminance of the original image.

In one embodiment of the present invention, the brightness of the first image and the brightness of the second image are

Where H is the luminance enhancement coefficient, Lr ¹ is the luminance of the red subpixel in the first image, Lg ¹ is the luminance of the green subpixel in the first image, Lb ¹ is the luminance of the green subpixel in the blue image in the first image, and the luminance of the sub-pixels, Lr ² are first and the luminance of the red sub-pixel in the second luminance image, Lg ² is the second in the luminance image and the luminance of the green sub-pixel, Lb ² is a luminance of the blue subpixel in the second luminance image Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, and Lb ⁰ is the luminance of the blue subpixel of the original image.

In one embodiment of the present invention, the brightness of the first image is

Where H is the luminance enhancement coefficient, Lr ¹ is the luminance of the red subpixel in the first image, Lg ¹ is the luminance of the green subpixel in the first image, Lb ¹ is the luminance of the green subpixel in the blue image in the first image, Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, Lb ⁰ is the luminance of the blue subpixel of the original image, Lr ^t Lg ^t is the luminance of the green subpixel of the information image, and Lb ^t is the luminance of the blue subpixel of the information image.

In one embodiment of the present invention, the brightness enhancement factor H may be a value between 0 and 0.4.

In one embodiment of the present invention, the brightness of the second image is

And the satisfy the condition, where H is a brightness enhancement coefficient, Lr ² is a second brightness and image brightness of the red subpixel in, Lg ² is the second in the luminance image and the luminance of the green sub-pixel, Lb ² is the second luminance Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, Lb ⁰ is the luminance of the blue subpixel of the original image, Lr ^t is the luminance of the red subpixel of the information image, Lg ^t is the luminance of the green subpixel of the information image, and Lb ^t is the luminance of the blue subpixel of the information image.

In one embodiment of the present invention, the brightness of the first image and the brightness of the second image are

, Where C may be a constant in the range of 1 to 2.

In one embodiment of the present invention, the brightness of the first image and the brightness of the second image are

Can be satisfied.

In one embodiment of the present invention, the brightness of the first image and the brightness of the second image are

, Where C may be a constant in the range of 1 to 2.

According to an embodiment of the present invention, the method may further include providing the first image as one of a left eye image and a right eye image of a 3D display; And providing the second image as any one of a left eye image and a right eye image of the 3D display.

In one embodiment of the present invention, the method may further include extracting only the first image using the special glasses on the output screen of the 3D display.

In an embodiment of the present invention, the method may further include the step of gazing at the viewer of the original image using the first image and the second image without using special glasses on the output screen of the 3D display.

In one embodiment of the present invention, the 3D display may be a shutter type.

In one embodiment of the present invention, the 3D display may be a polarization type.

In one embodiment of the present invention, the step of preparing the luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and the luminance (Lr ^t , Lg ^t , Lb ^t ) Converting the information image of the RGB format into a luminance information image represented by luminance, and converting the information image of the RGB format into a luminance information image represented by luminance.

In one embodiment of the present invention, the 3D display is a polarization type,

The 3D display uses a line by line 3D format, and at an edge where the gradation is abruptly changed in the information image, an intermediate gray level is formed along the outline of the boundary to reduce the artifact, Can be inserted.

In one embodiment of the present invention, the information image may be a menu, a subtitle, a symbol, a character, a graphic, a news, a time, a weather forecast, or another image to display irrespective of the information image.

(Lr ⁰ , Lg ⁰ , Lb ⁰ ) of an original image and the luminance (Lr ^t , Lg ^t , Lb ^t ) of an information image, and a step (Lr ¹ , Lg ¹ , Lb ¹ ) of the first image and a luminance (Lr ² ) of the second image by combining the original image and the information image to generate a first image and a second image, , Lg ^2, Lb ²⁾ is a predetermined multiple of the luminance of the original image.

According to an embodiment of the present invention, a display apparatus includes an information image unit for generating an information image; An image receiving unit for receiving an image from the outside and providing an original image of RGB format; An image processor for synthesizing the original image and the information image to generate a first image and a second image; And a 3D display unit that receives the first image from any one of a left eye image and a right eye image and receives and displays the second image from any one of a left eye image and a right eye image, Lr ¹ , Lg ¹ , and Lb ¹ ) of the first image and the luminance (Lr ² , Lg ² , Lb ² ) of the ^second image may be a predetermined multiple of the luminance of the original image.

According to an embodiment of the present invention, a display apparatus includes an information image unit for generating an information image; An original video part that generates the original video; An image processor for synthesizing the original image and the information image to generate a first image and a second image; And a 3D display unit that receives the first image from any one of a left eye image and a right eye image and receives and displays the second image from any one of a left eye image and a right eye image, Lr ¹ , Lg ¹ , and Lb ¹ ) of the first image and the luminance (Lr ² , Lg ² , Lb ² ) of the ^second image may be a predetermined multiple of the luminance of the original image.

The shutter glasses according to an embodiment of the present invention may provide a first image and a second image by synthesizing an original image and an information image that are 2D images, provide the first image as one of a left eye image and a right eye image, And a left eye shutter and a right eye shutter which are operated only when the first image is displayed while being synchronized with the first image of the shutter type 3D display providing the second image as any one of the left eye image and the right eye image.

The polarizing glasses according to an embodiment of the present invention may provide a first image and a second image by combining an original image and an information image, which are 2D images, provide the first image as one of a left eye image and a right eye image, The left and right polarizers are configured to have the same polarized light so as to obtain the first image from a polarizing type 3D display that provides the second image as any one of the left eye image and the right eye image.

2D video broadcasting, such as foreign language film broadcasting, may need to transmit subtitles along with video. Subtitles are usually produced separately from the 2D image and then added to the 2D image and then transmitted. Such separate subtitles need to be observed only by special people. When a person who speaks Korean as a mother tongue and a person who speaks English as a native language simultaneously watch TV or a movie in Korean, it is necessary that English subtitles for people who speak English as their native language are displayed on a 2D screen. However, people who speak Korean as their first language may not need English subtitles. Therefore, English subtitles need to be observed only by people whose native language is English. According to an embodiment of the present invention, only English speakers who wear special glasses can observe English subtitles. According to an embodiment of the present invention, English subtitles for people who speak English as a native language are displayed on a 2D screen, and a person who speaks Korean as a mother tongue wearing special glasses may not observe English subtitles.

In addition, according to an embodiment of the present invention, when a plurality of people watch one TV at the same time, a specific observer wearing a special glasses can display a menu or the like on the screen without disturbing another observer who does not wear the special glasses Display, word processing, Internet, and so on.

In addition, according to an embodiment of the present invention, when a plurality of people watch one TV at the same time, an observer wearing a special glasses can watch another broadcast program without disturbing other observers who do not wear the special glasses Other tasks can be performed.

In addition, according to an embodiment of the present invention, a user who wears special glasses can perform work in a state in which information that is not visible to people who are not wearing special glasses in an open space is kept secure.

In addition, according to an embodiment of the present invention, a presenter wearing a special glasses can perform presentation while viewing a special sentence displayed on a large announcement screen, but an audience who does not wear a special eyeglass can only view a screen without a special sentence have.

In addition, according to an embodiment of the present invention, a user wearing the special glasses can observe images different from those when the special glasses are removed. For example, when a user is listening to a class using an electronic book using a notepad having a touch panel, when the user takes off the special glasses, the electronic book is observed. When the user uses the special glasses, It is possible to observe an image including a note recorded on the recording medium.

In addition, according to an embodiment of the present invention, a user who wears special glasses can observe different images when removing the special glasses from the electronic blackboard. For example, when a student who does not wear the special glasses is listening to the class on the electronic board, the teacher wearing the special glasses can observe a special image from the electronic board.

There are many 3D technologies. Of these, stereoscopic TVs using special glasses are reported to account for more than 20 percent of the market in 2012. 3D movie theaters are universal, and the operating principles of 3D movie theaters are similar to those of stereoscopic systems.

As 3D displays become more popular, 3D displays need to be utilized to provide other functions in addition to providing stereoscopic images. The display technology according to an exemplary embodiment of the present invention can provide a special 2D image that is visible only to a special wearer of glasses, instead of providing a stereoscopic image by modifying the conventional 3D display device. In addition, the display technology according to an embodiment of the present invention can provide a special 2D image selectively displayed only to a special wearer while maintaining the function of the conventional 3D display device.

1 is a diagram illustrating a first image and a second image using an original image and an information image according to an embodiment of the present invention.
FIG. 2 shows the luminance enhancement coefficient H of FIG. 1 and the contrast ratio according to the luminance of the information image.
3 is a view for explaining a result of image processing according to an embodiment of the present invention.
4 is a view for explaining a result of image processing according to another embodiment of the present invention.
5 is a view for explaining a result of image processing according to another embodiment of the present invention.
6 is a view for explaining a result of image processing according to another embodiment of the present invention.
7 is a view for explaining a result of an image processing method according to an embodiment of the present invention.
FIGS. 8 to 12 are views for explaining the image processing method of FIG.
13 is a diagram illustrating a result of applying the variable contrast ratio image processing method according to an embodiment of the present invention.
14A and 14B are diagrams illustrating the concept of a system according to an embodiment of the present invention.
15A to 15C illustrate the operation principle of the present invention.
16A and 16B are diagrams illustrating a process of generating a first image and a second image.
17 illustrates the principle of operation for a stereoscopic display using polarizing glasses.
18 is an enlarged view of an input signal in which an area where the letter "u" of the subtitle "Seoul Tech "
19 shows an example of an original information image and a modified information image.
20 is a view showing first and second images generated using the modified information image.
21 is a view illustrating a display device according to an embodiment of the present invention.
22 is a block diagram of a display in accordance with an embodiment of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following drawings, like reference numerals refer to like elements, and the size of each element in the drawings may be exaggerated for clarity and convenience of explanation.

The display according to an embodiment of the present invention can provide a special 2D image only to a user wearing special eyeglasses. The display may be operated using a modified shutter eyeglass or modified polarizing eyeglasses and a stereoscopic display.

Hereinafter, the operation principle of the present invention will be described.

The 3D display of the shutter glass system sequentially displays the left eye image (first frame) and the right eye image (second frame) with a time difference of 16.7 msec (milliseconds). In the conventional shutter glass, the left shutter of the shutter glass is opened while the right shutter of the shutter glass is closed while the first frame is displayed. Accordingly, the left eye can see the first frame while the first frame is being displayed. While the second frame is displayed, the right shutter of the shutter glass is opened and the left shutter of the shutter glass is closed. Accordingly, the right eye can see the second frame while the second frame is being displayed. The image of the left eye receiving the first frame having the time difference and the image of the right eye receiving the second frame are recognized as stereoscopic images through the human brain.

Meanwhile, according to an embodiment of the present invention, a conventional method of operating a shutter glass must be changed. Specifically, while the 3D display displays the first frame, both the left shutter and the right shutter of the shutter glass are simultaneously opened. On the other hand, while the 3D display is displaying the second frame, both the left shutter and the right shutter of the shutter glass are closed at the same time. Therefore, the observer wearing the special glasses can observe only the first frame. In addition, an observer who does not wear the special glasses can observe both the first frame and the second frame with a time difference. Accordingly, the observer who does not wear the special glasses recognizes the composite image of the first frame and the second frame. Therefore, the viewer can not see the stereoscopic image regardless of wearing the special glasses, but the observer wearing the special shutter glasses can recognize the image different from the observer who does not wear the special shutter glasses. That is, an observer who does not wear a special shutter glass recognizes a conventional 2D original image, and an observer wearing a special shutter glass can observe an image different from a conventional 2D image. For this purpose, image processing of a new structure, which is not a left eye image and a right eye image, provided by a conventional 3D display is required.

The polarizing glasses type 3D display simultaneously displays the left eye image (first frame) and the right eye image (second frame). The emitted light of the first frame has a first polarized light and the emitted light of the second frame has a second polarized light that is orthogonal to the first polarized light. Typically, the odd lines of the 3D display of the polarizing glasses scheme provide a first frame having a first polarization and the even lines can provide a second frame having a second polarization. The polarizing glasses type 3D display can simultaneously provide the first frame and the second frame. Conventional polarizing glasses include a left polarizer having a first polarized light and a right polarizer having a second polarized light. The left polarizer transmits the first frame and the right polarizer transmits the second frame. An observer wearing polarized glasses simultaneously observes the first frame and the second frame, and the observer's brain recognizes a stereoscopic image.

Meanwhile, according to one embodiment of the present invention, a method of operating the conventional polarizing glasses must be changed. Specifically, the 3D display outputs a first frame that is polarized with the first polarized light and a second frame that has a second polarized light that is orthogonal to the first polarized light. An odd line of the 3D display of the polarizing glasses scheme may provide a first frame having a first polarization and an even line may provide a second frame having a second polarization. Meanwhile, the left polarizer of the special glasses according to an embodiment of the present invention has the first polarized light and the right polarizer has the first polarized light. Accordingly, both of the left polarizer and the right polarizer of the polarizing glasses transmit only the first frame having the first polarized light and completely block the second frame having the second polarized light. Therefore, the observer can not see the stereoscopic image. However, an observer wearing polarized glasses observes only the first frame, and an observer who does not wear polarized glasses can recognize a synthesized image of the first frame and the second frame. Therefore, image processing is required so that an observer who does not wear polarized glasses observes a conventional 2D image, and an observer wearing polarized glasses observes a specific image.

The display according to an embodiment of the present invention may function as a 2D display. However, the display can output two different images similar to a stereoscopic image. If the 3D display is a shutter type, the first frame and the second frame are output with a time difference. When the 3D display is a polarization type, the first and second frames having different polarizations are simultaneously output.

The display may be a smart 3D TV, or a generic 3D TV, a 3D mobile phone, or a 3D monitor, a 3D projector, or a 3D electronic blackboard. Smart 3D TV can include image processing module inside. Accordingly, an image processing algorithm according to an embodiment of the present invention can be installed. If the 3D display does not include an image processing module, an externally processed input signal may be provided to the display.

First, the 2D original image to be displayed is prepared. The 2D original image may be an image converted from a 3D image or may be a 2D image originally.

For example, a 2D original image may have 1920 x 1080 pixels. Each pixel may have R, G, and B subpixels. The original image may be combined with an information image to be displayed and converted into a first image (first frame) and a second image (second frame). The information image may include at least one of a character, a graphic, and a picture. The original image may be a still image, a moving image, or a broadcast image. The original image may be in RGB format or YCbCr format. The YCbCr format can be converted into an RGB format through color coordinate conversion.

The information image may be a menu screen of the TV, a subtitle, a character, a graphic, a news, a time, a weather forecast, or another image to be displayed. Accordingly, the observer wearing the special glasses can observe the first image reflecting the information image, and the observer who does not wear the special glasses can view the first image (first frame) and the second image (second frame) So that the original image can be mistaken.

The original image may be prepared in an RGB data format. The RGB data may be converted to luminance. The luminance may be normalized to a maximum value, with a maximum value of 1 and a minimum value of zero. Specifically, when the graylevel of the subpixel is 0, the brightness can be zero. If the gray level of the subpixel is 255, the luminance may have a value of 1. The relationship between the luminance and the gray level can be varied in various functional relationships. For example, the luminance original image can be expressed as follows using the relationship between the gray level and the luminance. x and y represent the coordinates of the pixel.

Here, Gr ⁰ represents the gray level of the red subpixel of the original image, x and y represent the pixel coordinates, and Lr ⁰ represents the brightness of the red subpixel of the luminance original image. Also,? 1 is a red gamma correction coefficient. Gg ⁰ represents the gray level of the green subpixel of the original image, and Lg ⁰ represents the brightness of the green subpixel of the brightness original image. Further,? 2 is a green gamma correction coefficient. Gb ⁰ represents the gray level of the blue subpixel of the original image, and Lb ⁰ represents the brightness of the blue subpixel of the brightness original image. Further,? 3 is a blue gamma correction coefficient. The gray level values of all the pixels of the original image may be converted to brightness.

The information image may be prepared in an RGB data format. The RGB data may be converted to luminance. The luminance may be normalized to a maximum value, with a maximum value of 1 and a minimum value of zero. Specifically, when the graylevel of the subpixel is 0, the brightness can be zero. If the gray level of the subpixel is 255, the luminance may have a value of 1. The information constituting the information image may be provided through wired communication or wireless communication in real time, or may be already stored data. The relationship between the luminance and the gradation can be variously related to the function, and the luminance information image can be expressed as follows using the relationship between the gradation and the luminance.

Here, Gr ^t represents the gray level of the red subpixel of the information image, and Lr ^t represents the brightness of the red subpixel of the brightness information image. Also, gamma 1 is a red gamma correction coefficient and can be selected to a constant value depending on the display device. Gg ^t represents the gray level of the green subpixel of the information image, and Lg ^t represents the brightness of the green subpixel of the brightness information image. Further,? 2 is a green gamma correction coefficient. Gb ^t represents the gray level of the blue subpixel of the information image, and Lb ^t represents the brightness of the blue subpixel of the brightness information image. Further,? 3 is a blue gamma correction coefficient.

[Brightness Improvement Method]

The first luminance image which is visible only to the wearer of the eyeglass can be formed as follows.

Here, H is a luminance enhancement coefficient, and may have a value of 0 to 1. Lr ¹ is the luminance of the red subpixel in the first luminance image, Lg ¹ is the luminance of the green subpixel in the first luminance image, and Lb ¹ is the luminance of the blue subpixel in the first luminance image.

The second luminance image may be formed as follows.

Here, Lr ² is the luminance of the red subpixel in the second luminance image, Lg ² is the luminance of the green subpixel in the second luminance image, and Lb ² is the luminance of the blue subpixel in the second luminance image.

The first luminance image and the second luminance image may have the following conditions. In any pixel, the sum of the luminance of the first luminance image of the subpixel and the luminance of the second luminance image of the subpixel is constant. That is, the sum of the luminance of the first luminance image and the luminance of the second image may be increased by [H + 1] times as compared with the luminance of the original image. For example, when the brightness enhancement coefficient (H) is 0.4, the brightness can be increased 1.4 times. However, as the brightness enhancement coefficient H increases, the contrast of the first brightness image may decrease.

The first luminance image can be converted into a first RGB image (first frame) using the following equation.

Gr ¹ represents the gray level of the red subpixel of the first RGB image, and Lr ¹ represents the brightness of the red subpixel of the first RGB image. Also,? 1 is a red gamma correction coefficient. Gg ¹ represents the gray level of the green subpixel of the first RGB image, and Lg ¹ represents the brightness of the green subpixel of the first RGB image. Further,? 2 is a green gamma correction coefficient. Gb ¹ represents a gray scale of the blue sub-pixel of the first RGB video, Lb ¹ represents the luminance of the first image of the RGB blue subpixels. Further,? 3 is a blue gamma correction coefficient.

The second luminance image may be converted into a second RGB image (second frame) using the following equation.

Gr ² is the second of the RGB image represents a gray scale of the red sub-pixel, Lr ² represents the luminance of the second image of the RGB red subpixels. Also,? 1 is a red gamma correction coefficient. Gg ² is the second of the RGB image represents a gray scale of the green sub-pixel, Lg ² represents the luminance of the green sub pixel in the second RGB image. Further,? 2 is a green gamma correction coefficient. Gb ^2, the second indicates the gray level of the RGB image, the blue sub-pixel, Lb ² represents the luminance of the second image of the RGB blue subpixels. Further,? 3 is a blue gamma correction coefficient.

The first RGB image and the second RGB image may be provided instead of the left eye image and the right eye image of a typical 3D display. In addition, the special glasses can operate differently from conventional stereoscopic glasses.

Specifically, in the case of the polarization type, the left and right polarizers of the special glasses may have the same first polarized light. Accordingly, the observer wearing the special glasses can transmit the first RGB image having the first polarized light and block the second RGB image having the second polarized light. The observer who does not wear the special glasses senses the composite image of the first RGB image having the first polarized light and the second RGB image having the second polarized light.

Specifically, in the case of the shutter system, the 3D display provides the first RGB image and the second RGB image with a time difference. The special glasses can provide the first RGB image to the left eye and the right eye with the left shutter and the right shutter simultaneously opened. On the other hand, the special glasses may block the second RGB image from being provided to the left eye and the right eye with the left shutter and the right shutter being closed at the same time. Accordingly, the observer wearing the special glasses can observe the first RGB image through the right eye and the left eye at a specific time. The observer who does not wear the special glasses can observe the first RGB image and the second RGB image at the same time and recognize the synthesized image of the first RGB image and the second RGB image.

1 is a diagram illustrating a first image and a second image using an original image and an information image according to an embodiment of the present invention.

FIG. 2 shows the luminance enhancement coefficient H of FIG. 1 and the contrast ratio according to the luminance of the information image.

1 and 2, the information image may be an image different from the original image. The information image and the original image may be processed to generate a first image and a second image. The first image and the second image may be displayed by a 3D display. The observer wearing the special glasses can observe the first image and the observer who does not wear the glasses can observe the composite image of the first image and the second image substantially identical to the original image.

Referring to Equation (3), when H = 0 and the information image has a black character (L ^t = 0) on a white background, the black character is displayed in black in the first image, The white background of the original image is indicated by the luminance of the original image. Thus, the contrast ratio can have infinity.

Referring to Equation (4), when H = 0 and the information image has a black character (L ^t = 0) on a white background, the black character in the second image is represented by the luminance of the original image, The white background of the information image is displayed in black.

Referring to Equation (3), when H = 0 and the information image has a gray character (L ^t = 0.2) on a white background, the gray character is grayed on the first image, The white background of the original image is indicated by the luminance of the original image. Thus, the contrast ratio can have a maximum of 5. Typically, when the contrast ratio is 10 or more, the characters of the information image can be observed clearly by the observer. Therefore, it is preferable that the luminance to be displayed in the information image is 0.2 or more.

Referring to Equation (3), when H = 0 and the information image has a gray character (L ^t = 0.8) on a white background, the gray character is grayed on the first image, The white background of the original image is indicated by the luminance of the original image. Thus, the contrast ratio can have a maximum of 1.25.

Referring to Equation (3), when H = 0.1 and the information image has a black character (L ^t = 0) on a white background, the black character is grayed in the first image, The white background of the original image is indicated by the luminance of the original image. Thus, the contrast ratio can have a maximum of 10.

Referring to Equation (3), when H = 0.2 and the information image has a black character (L ^t = 0) on a white background, the black character is grayed in the first image, The white background of the original image is indicated by the luminance of the original image. Thus, the contrast ratio can have a maximum of 5. Thus, the black character of the information image may be seen as translucent in the first image. As the brightness enhancement coefficient increases, the degree of semitransparency may increase.

Hereinafter, a specific example will be described.

Referring to equations (3) and (4), when the luminance enhancement coefficient (H) is zero, the contrast ratio is high. In this case, when the information image represents a black character, in the pixel occupied by the black character, the gray level Gr ^t of the red sub pixel is zero, the gray level Gg ^t of the green sub pixel is zero, The gradation (Gb ^t ) of the pixel is zero. Therefore, the luminance information image of a black character portion ^{(Lr t = 0, Lg t} = 0, Lb t = 0) , and the luminance information of the image of the white background region other than the character display is ^{(Lr t = 1, Lg t} = 1, Lb ^t = 1). Referring to Equations (3) and (4), the first luminance image and the second luminance image may be expressed as follows.

Black text The luminance per pixel of the first luminance image The luminance per pixel of the second luminance image Character display area (Lr ¹ = 0, Lg ¹ = 0, Lb ¹ = 0)
(Lr ² = ⁰ Lr, Lg ² = ⁰ Lg, Lb Lb = ^{2 0)}
Area other than letter display (Lr ¹ = Lr ⁰ , Lg ¹ = Lg ⁰ , Lb ¹ = Lb ⁰ ) ^{(Lr 2 = 0, Lg 2} = 0, Lb 2 = 0)

Therefore, the sum of the luminance (Lr ¹ ) of the red subpixel of the first luminance image and the luminance (Lr ² ) of the red subpixel of the second luminance image in the black character display region is the sum of the luminance Lr ⁰ of the red subpixel same. In addition, the sum of the luminance (Lg ¹ ) of the green subpixel of the first luminance image and the luminance (Lg ² ) of the green subpixel of the second luminance image in the black character display region is the sum of the luminance Lg ⁰ of the green subpixel same. In addition, the sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image in the black character display region is the sum of the luminance Lb ⁰ of the blue subpixel same.

Further, in a region other than the black character display, the sum of the luminance (Lr ¹ ) of the red subpixel of the first luminance image and the luminance (Lr ² ) of the red subpixel of the second luminance image is the luminance of the red subpixel (Lr ⁰ ). In addition, the sum of the luminance (Lg ¹ ) of the green subpixel of the first luminance image and the luminance (Lg ² ) of the green subpixel of the second luminance image in the area other than the black character display corresponds to the luminance Lg ⁰ < / RTI > In addition, the sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image in the region other than the black character display corresponds to the luminance Lb ⁰ < / RTI >

As a result, an observer who does not wear the glasses observes the original image because the 3D display provides the brightness of the original image in all areas including the black character display area and the area other than the character display area.

On the other hand, an observer wearing glasses observes only the first luminance image or the first RGB image. Thus, the first RGB image contains a black character in the black character display area. Therefore, an observer wearing glasses can observe an image in which a black character is engraved on the original image.

If the information image includes a subtitle of a movie, an observer wearing glasses can observe black subtitles. On the other hand, an observer who does not wear glasses can mistake the first RGB image and the second RBG image as the original image.

The case where the information image displays a red character is explained.

Referring to Equations (3) and (4), when the brightness enhancement coefficient (H) is zero, the contrast ratio is high. In this case, when the information image displays a red character, in the pixel occupied by the red character, the luminance (Lr ^t ) of the red subpixel is 1, the luminance (Lg ^t ) of the green subpixel is zero, The luminance (Lb ^t ) of the pixel is zero. Therefore, the luminance information image of the red character portion ^{(Lr t = 1, Lg t} = 0, Lb t = 0) , and the luminance information of the image of the red characters other than the portion ^{(Lr t = 1, Lg t} = 1, Lb t = 1). The first luminance image and the second luminance image may be displayed as follows.

Display red letters The luminance per pixel of the first luminance image The luminance per pixel of the second luminance image Red character display area (Lr ¹ = Lr ⁰ , Lg ¹ = 0, Lb ¹ = 0)
^{(Lr 2 = 0, Lg 2} = Lg 0, Lb 2 = Lb 0)
Area other than red letter display (Lr ¹ = Lr ⁰ , Lg ¹ = Lg ⁰ , Lb ¹ = Lb ⁰ ) ^{(Lr 2 = 0, Lg 2} = 0, Lb 2 = 0)

Thus, the red first luminance brightness of the red sub-pixel of an image in the character display area (Lr ¹⁾ and the sum is the luminance of the red sub-pixel of the source image of the luminance of the red sub-pixel of the second luminance image (Lr ²⁾ (Lr ⁰ ). In addition, the red first luminance brightness of the green sub-pixel of an image in the character display area (Lg ¹⁾ and the sum is the luminance of the green sub-pixels of the source image of the luminance of the green sub-pixel of the second luminance image (Lg ²⁾ (Lg ⁰ ). In addition, the luminance of the first luminance image from the red character display area blue subpixels (Lb ¹⁾ and the second luminance blue luminance of the sub-pixels of the image (Lb ²⁾ sums the luminance of the blue sub-pixel of the source image of the (Lb ⁰ ).

The sum of the luminance (Lr ¹ ) of the red subpixel of the first luminance image and the luminance (Lr ² ) of the red subpixel of the second luminance image in the region other than the red character display is the sum of the luminance (Lr ⁰ ). The sum of the luminance (Lg ¹ ) of the green subpixel of the first luminance image and the luminance (Lg ² ) of the green subpixel of the second luminance image in the area other than the red character display is the luminance Lg ⁰ ). In addition, the sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image in the region other than the red character display is the luminance of the blue subpixel Lb ⁰ ).

The case where the information image displays a green character is explained.

Referring to Equations (3) and (4), when the brightness enhancement coefficient (H) is zero, the contrast ratio is high. In this case, when the information image displays a green character, in the pixel occupied by the green character, the luminance (Lg ^t ) of the green subpixel is 1, the luminance (Lr ^t ) of the red subpixel is zero, The luminance (Lb ^t ) of the pixel is zero. Therefore, the luminance information image of a green character portion ^{(Lr t = 0, Lg t} = 1, Lb t = 0) , and the luminance information of the image of the portion other than the green characters ^{(Lr t = 1, Lg t} = 1, Lb ^t = 1). The first luminance image and the second luminance image may be displayed as follows.

Show green lettering The luminance per pixel of the first luminance image The luminance per pixel of the second luminance image Green lettering area (Lr ¹ = 0, Lg ¹ = Lg ⁰ , Lb ¹ = 0)
^{(Lr 2 = Lr 0, Lg} 2 = 0, Lb 2 = Lb 0)
Areas other than the green character display (Lr ¹ = Lr ⁰ , Lg ¹ = Lg ⁰ , Lb ¹ = Lb ⁰ ) ^{(Lr 2 = 0, Lg 2} = 0, Lb 2 = 0)

Therefore, the luminance of the first luminance image in green character display area, the red sub-pixel (Lr ¹⁾ and the sum is the luminance of the red sub-pixel of the source image of the luminance of the red sub-pixel of the second luminance image (Lr ²⁾ (Lr ⁰ ). In addition, the luminance of the green character display area, the first luminance image of the green sub-pixel (Lg ¹⁾ and the sum is the luminance of the green sub-pixels of the source image of the luminance of the green sub-pixel of the second luminance image (Lg ²⁾ (Lg ⁰ ). Also, in the green character display area The sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image is equal to the luminance (Lb ⁰ ) of the blue subpixel of the original image.

Further, in a region other than the green character display, the sum of the luminance (Lr ¹ ) of the red subpixel of the first luminance image and the luminance (Lr ² ) of the red subpixel of the second luminance image is the luminance of the red subpixel (Lr ⁰ ). In addition, the sum of the luminance (Lg ¹ ) of the green subpixel of the first luminance image and the luminance (Lg ² ) of the green subpixel of the second luminance image in the region other than the green character display corresponds to the luminance Lg ⁰ ). In addition, the sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image in the region other than the green character display is the luminance of the blue subpixel Lb ⁰ ).

Even when the information image displays a blue character, the same process as that for displaying red and green characters can be shown.

The case where the information image displays gray characters is explained.

Referring to Equations (3) and (4), when the brightness enhancement coefficient (H) is zero, the contrast ratio is high. In this case, when the information image displays gray characters, in the pixel occupied by the gray character, the luminance (Lr ^t ) of the red subpixel is 20 percent of the maximum luminance and the luminance (Lg ^t ) of the green subpixel is the maximum 20 percent of the luminance, and the luminance (Lb ^t ) of the blue subpixel may be 20 percent of the maximum luminance. Therefore, the luminance information image of a gray character portion ^{(Lr t = 0.2, Lg t} = 0.2, Lb t = 0.2) , and the luminance information of the image of the portion other than the gray character ^{(Lr t = 1, Lg t} = 1, Lb ^t = 1). The first luminance image and the second luminance image may be displayed as follows.

Show gray letters The luminance per pixel of the first luminance image The luminance per pixel of the second luminance image Gray text area (Lr ¹ = Lr ⁰ x 0.2, Lg ¹ = Lg ⁰ x 0.2, Lb ¹ = Lb ⁰ x 0.2) (Lr ² = Lr ⁰ x 0.8, Lg ² = Lg ⁰ x 0.8, Lb ² = Lb ⁰ x 0.8) Areas other than gray letters (Lr ¹ = Lr ⁰ , Lg ¹ = Lg ⁰ , Lb ¹ = Lb ⁰ ) ^{(Lr 2 = 0, Lg 2} = 0, Lb 2 = 0)

Thus, a gray first luminance brightness of the red sub-pixel of an image in the character display area (Lr ¹⁾ and the sum is the luminance of the red sub-pixel of the source image of the luminance of the red sub-pixel of the second luminance image (Lr ²⁾ (Lr ⁰ ). In addition, the luminance of a gray character display area in the first luminance image of the green sub-pixel (Lg ¹⁾ and the luminance of the green sub-pixel of the second luminance image (Lg ²⁾ sums the luminance of the green sub-pixels of the source image of the (Lg ⁰ ). In addition, the luminance of a gray character display area in a first of the luminance image blue subpixels (Lb ¹⁾ and the second luminance blue luminance of the sub-pixels of the image (Lb ²⁾ sums the luminance of the blue sub-pixel of the source image of the (Lb ⁰ ).

Further, in a region other than the gray character display, the sum of the luminance (Lr ¹ ) of the red subpixel of the first luminance image and the luminance (Lr ² ) of the red subpixel of the second luminance image is the luminance of the red subpixel (Lr ⁰ ). In addition, the sum of the luminance (Lg ¹ ) of the green subpixel of the first luminance image and the luminance (Lg ² ) of the green subpixel of the second luminance image in the region other than the gray character display corresponds to the luminance Lg ⁰ ). In addition, the sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image in the region other than the gray character display is the luminance of the blue subpixel Lb ⁰ ).

The case where the luminance enhancement coefficient H is not zero is explained.

Referring to Equations (3) and (4), when the brightness enhancement coefficient (H) is not zero, the contrast ratio decreases. When the information image represents a black character, in the pixel occupied by the black character, the luminance (Lr ^t ) of the red subpixel is zero, the luminance (Lg ^t ) of the green subpixel is zero, (Lb ^t ) is zero. Therefore, the luminance information image of the black character portion is (Lr ^t = 0, Lg ^t = 0, Lb ^t = 0). The first luminance image and the second luminance image may be displayed as follows.

Black text display The luminance per pixel of the first luminance image The luminance per pixel of the second luminance image Black text area (Lr ¹ = Lr ⁰ x H, Lg ¹ = Lg ⁰ x H, Lb ¹ = Lb ⁰ x H) (Lr ² = ⁰ Lr, Lg ² = ⁰ Lg, Lb Lb = ^{2 0)} Areas other than black lettering (Lr ¹ = Lr ⁰ , Lg ¹ = Lg ⁰ , Lb ¹ = Lb ⁰ ) Lr = Lr ^{2 0} x H, Lg ² Lg = ⁰ x H, Lb ² = Lb ⁰ x H)

Thus, the first luminance brightness of the red sub-pixel of an image in the black character display area (Lr ¹⁾ and the sum is the luminance of the red sub-pixel of the source image of the luminance of the red sub-pixel of the second luminance image (Lr ²⁾ (Lr ⁰ (1 + H) times. In addition, the first luminance green luminance of the sub-pixel of an image in the black character display area (Lg ¹⁾ and the sum is the luminance of the green sub-pixels of the source image of the luminance of the green sub-pixel of the second luminance image (Lg ²⁾ (Lg ⁰ (1 + H) times. In addition, the luminance of the first luminance image in a black character display area blue subpixels (Lb ¹⁾ and the second luminance blue luminance of the sub-pixels of the image (Lb ²⁾ sums the luminance of the blue sub-pixel of the source image of the (Lb ⁰ (1 + H) times.

Further, in a region other than the black character display, the sum of the luminance (Lr ¹ ) of the red subpixel of the first luminance image and the luminance (Lr ² ) of the red subpixel of the second luminance image is the luminance of the red subpixel (1 + H) times of Lr ⁰ . In addition, the sum of the luminance (Lg ¹ ) of the green subpixel of the first luminance image and the luminance (Lg ² ) of the green subpixel of the second luminance image in the region other than the black character display corresponds to the luminance of the green subpixel Lg < / RTI > ⁰ ). In addition, the sum of the luminance (Lb ¹ ) of the blue subpixel of the first luminance image and the luminance (Lb ² ) of the blue subpixel of the second luminance image in the region other than the black character display corresponds to the luminance of the blue subpixel Lb < / RTI > ⁰ ).

When H is 0.4 or more, the brightness of the first luminance image increases and the contrast ratio decreases, so that the visibility can be reduced.

Referring to Equations (3) and (4), when the brightness enhancement coefficient (H) is not zero, the contrast ratio decreases. When the information image displays an arbitrary color, in a pixel occupied by the information image, the luminance (Lr ^t ) of the red subpixel is a predetermined value, the luminance (Lg ^t ) of the green subpixel is a predetermined value, And the luminance (Lb ^t ) of the blue subpixel is a predetermined value. Therefore, the luminance information image of the information image is (Lr ^t , Lg ^t , Lb ^t ). The first luminance image and the second luminance image can be obtained using Equations (3) and (4).

The first RGB image corresponding to the first luminance image described above is displayed instead of the left eye image of the 3D display device and the second RGB image corresponding to the second luminance image is displayed instead of the right eye image of the 3D display device .

In the shutter 3D device, the first RGB image is displayed instead of the left eye image, and the second RGB image is displayed instead of the right eye image. The first RGB image may constitute a first frame, and the second RGB image may constitute a second frame. The first frame and the second frame may be displayed on the display alternating with a period of 16.7 msec. The shutter glasses specially designed to observe only the first frame are prepared. In the shutter glasses specially designed to observe only the first frame, while the first frame is displayed, the left shutter and the right shutter can be operated to simultaneously transmit the first frame. Further, while the second frame is displayed, the left shutter and the right shutter can simultaneously operate to block the second frame. Accordingly, an observer who does not wear the shutter glasses recognizes the combined image of the first frame and the second frame. Thus, the observer perceives an image without a caption.

On the other hand, an observer wearing the shutter glasses observes only the first frame. Accordingly, the first frame includes the first RGB image, and the first RGB image is the image obtained by adding the information image to the original image. Therefore, the viewer recognizes the image with the caption subtitle wearing the shutter glasses.

In the polarizing 3D device, the first RGB image is displayed instead of the left eye image, and the second RGB image is displayed instead of the right eye image. The first RGB image may constitute a first frame, and the second RGB image may constitute a second frame. The first frame may provide an odd line and the second frame may provide an even line. Thus, polarizing glasses specially designed to observe only the first frame are prepared. The polarized glasses specially designed to observe only the first frame transmit only the first frame to the left and right eyes. Accordingly, an observer wearing polarized glasses observes the first frame or the first RGB image. On the other hand, an observer who does not wear polarized glasses observes the first frame and the second frame at the same time, and synthesizes the first frame and the second frame to cause an optical illusion such as viewing the original image.

The original associative image may be a white image. In this case, the sum of the first image and the second image is a white image, and the first image may be generated by processing an input signal and an information image. The second image may be generated by processing an input signal and an information image. Accordingly, the observer who does not wear the glasses recognizes the white image, and the observer wearing the glasses can recognize the information image and the image processed the input signal. This method can be used for security.

3 is a view for explaining a result of image processing according to an embodiment of the present invention.

Referring to FIG. 3, an original image and an information image are prepared. The original image may be a white image, and the information image may include a black character on a white background. In this case, the first image may have a black character on a white background. Further, the second image may be generated so as to satisfy the equations (3) to (5).

The observer wearing the special glasses can observe only the first image and the observer who does not wear the special glasses can observe the composite image of the first image and the second image. The composite image may be substantially the same as the original image. Accordingly, when an observer wearing glasses wears a predetermined job using a computer, the image that the computer is intended to display may be the information image. The computer can generate the first image and the second image using the information image and the original image of the white color. Therefore, the image processing method according to an embodiment of the present invention can be used for security.

4 is a view for explaining a result of image processing according to another embodiment of the present invention.

Referring to FIG. 4, the original image may be divided into a first area including information and a second area of a white background. Also, the information image may be divided into a first area of a white background that does not contain information and a second area that includes information. The first area of the original image and the first area of the information image may coincide when overlapping. In addition, the second region of the original image and the second region of the information image may coincide with each other when overlapping. The second area of the information image may display various information such as time, caption, weather, news, or a menu icon.

Referring to Equations (3) and (4), a first image and a second image may be generated. Therefore, artifacts that may occur when the information image and the original image overlap are eliminated.

5 is a view for explaining a result of image processing according to another embodiment of the present invention.

Referring to FIG. 5, the original image may be divided into a first area including information and a second area of a white background. Further, the information image may be divided into a first area of a black background that does not contain information and a second area that includes information. The first area of the original image and the first area of the information image may coincide when overlapping. In addition, the second region of the original image and the second region of the information image may coincide with each other when overlapping. The second area of the information image may display various information such as time, caption, weather, news, image, or menu icon.

Referring to Equations (3) and (4), a first image and a second image may be generated. Therefore, artifacts that may occur when the information image and the original image overlap are eliminated.

6 is a view for explaining a result of image processing according to another embodiment of the present invention.

Referring to FIG. 6, the original image may be divided into a first area including information and a second area of a white background. Also, the information image may be divided into a first area of an hinted background that does not contain information and a second area that includes information. The first area of the original image and the first area of the information image may coincide when overlapping. In addition, the second region of the original image and the second region of the information image may coincide with each other when overlapping. The second area of the information image may display various information such as time, caption, weather, news, image, or menu icon.

Referring to Equations (3) and (4), a first image and a second image may be generated. Therefore, artifacts that may occur when the information image and the original image overlap are eliminated.

[Variable Contrast Ratio Method]

Hereinafter, an image processing method according to a modified embodiment of the present invention will be described.

Referring to Equation (5), when the original image and the information image are displayed as the first image and the second image, the observer who does not wear the special glasses observes the composite image of the first image and the second image, The luminance can be increased by 1 + H times. However, the actual luminance of the composite image is (1 + H) / 2.

Referring to Equation (5), when H = 0.1, the actual luminance of the synthesized image of the non-eyeglasses is 55% of the original image of 2D. Referring to Equation 3, the actual luminance of the first image when wearing glasses is 50 percent of the original image of 2D.

Referring to Equation (5), when H = 0.3, the actual luminance of the synthesized image of the non-eyeglasses is 65 percent of the original image of 2D. Referring to Equation 3, the actual luminance of the first image when wearing glasses is 50 percent of the original image of 2D.

Referring to Equation 5, when H = 0.5, the actual luminance of the synthesized image of the non-eyeglasses is 75 percent of the original image of 2D. Referring to Equation 3, the actual luminance of the first image when wearing glasses is 50 percent of the original image of 2D.

Therefore, it is required to increase the luminance of the synthesized image of the non-eyeglasses to 100% of the original image of 2D and increase the luminance of the first image to 100% of the original image of 2D when the spectacles are worn.

The gradation information (or brightness information) of the first image and the second image may be adjusted to be one to two times the brightness of the original image. Specifically, when the grayscale of the original image is 170 to 180 gray or less, since the luminance of the original image is smaller than 1/2 of the maximum luminance, the luminance of the first image can be doubled. Therefore, since the observer who does not wear the special glasses observes the composite image of the first image and the second image, the actual luminance of the composite image is (the luminance of the first image + the luminance of the second image) / 2, It is the same as the luminance. The fact that the actual luminance of the composite image is reduced by a factor of two is due to time division or space division of the 3D display.

The luminance of the first image ^{(Lr 1 (x, y)} , Lg 1 (x, y), Lb 1 (x, y)) and the luminance of the second image ^{(Lr 2 (x, y)} , Lg 2 (x, ^{y), Lb 2 (x,} y)) is brightness of the source image ^{(Lr 0 (x, y)} , Lg 0 (x, y), Lb 0 (x, y)) and a luminance information image (Lr ^t ( (x, y), Lg ^t (x, y), and Lb ^t (x, y).

Here, C may have a value between 1 and 2. C is a constant value, and when C = 1, it can be the same as that in the case of H = 0 in the equations (3) to (5).

The brightness of the source image ^{(Lr 0 (x, y)} , Lg 0 (x, y), Lb 0 (x, y)) and the luminance (Lr ^t (x, y of the information ^{image), Lg t (x, y} ) , Lb ^t (x, y)) it is given, if the luminance of the first image (Lr ¹ (x, y), Lg ¹ (x, y), Lb ¹ (x, y)) and the luminance of the second image ( ^{Lr 2 (x, y),} Lg 2 (x, y), Lb 2 (x, y)) may be given as follows.

Thus, the information image ^{(Lr t (x, y)} = 1, Lg t (x, y) = 1, Lb t (x, y) = 1) when is 1, the first image (Lr ¹ (x, y ), Lg ¹ (x, y) and Lb ¹ (x, y) are (C Lr ⁰ (x, y), C Lg ⁰ (x, y), C Lb ⁰ The brightness of the first image when wearing glasses is C times that of the original image of 2D. The actual luminance of the first image when wearing glasses is C / 2 times the original image of 2D.

Referring to Equation (9), the luminance of the synthesized image of the non-eyeglasses is C times the original image of the 2D image. Also, the luminance of the first image when the spectacles are worn is C times the original image of the 2D image.

However, when the gray level of the original image than the 170 to 180 gray, the luminance of the original image ^{(Lr 0 (x, y)} > 0.5, Lg 0 (x, y)> 0.5, Lb 0 (x, y)> 0.5) may exceed 0.5. In this case, the brightness (Lr ¹ (x, y)> 1, Lg ¹ (x, y)> 1, Lb ¹ (x, y) .1) of the first image may exceed one. However, the maximum value of the luminance of the first image is one. Therefore, when the luminance of the first image is saturated to 1 or the luminance of the second image is saturated to 1, the luminance of the first image and the luminance of the second image can be adjusted as follows.

If the luminance or grayscale of the original image is high, the luminance of the second image is saturated and can not be doubled. Accordingly, the brightness of the first image and the brightness of the second image are adjusted together.

When the luminance or gradation of the original image is high, the luminance of the first image is saturated and can not be doubled. Accordingly, the brightness of the first image and the brightness of the second image are adjusted together. On the other hand, some gradation information of the first image may be lost.

7 is a view for explaining a result of an image processing method according to an embodiment of the present invention.

FIGS. 8 to 12 are views for explaining the image processing method of FIG.

Referring to FIGS. 7 to 12, when C = 1, the image processing method of Equation (8) and the image processing method of Equations (3) to (5) are the same.

The variable contrast ratio image processing method according to Equations (8) to (9) can be summarized as shown in FIG.

Referring to FIG. 8, when C = 2 and the information image is a black character, an arbitrary original image includes pixels in the range of 0 to 255, and for the original image of the threshold gradation (G ⁰ th) 2 image brightness can be doubled. However, if the grayscale of the original image is ^greater than the threshold gradation (G ⁰ th), the luminance of the second image is saturated to a maximum value of 1 and can not increase any more. However, the composite image of the first image and the second image increases in brightness of the first image so as to satisfy the condition of Equation (8) in order to visualize the original image. Therefore, the control ratio of the first image in the first region below the threshold gradation may be infinite, based on the threshold gradation. On the other hand, the contrast ratio of the first image in the second region exceeding the threshold gradation may range from 1 to infinity.

According to Equation (9), the luminance of the first image or the threshold luminance (L ⁰ th) of the original image in which the luminance of the second image is 1 can be given. The threshold gradation may correspond to the threshold luminance (L ⁰ th). Since the luminance of the information image is zero, the threshold luminance may be given by the condition that the luminance of the second image is one. The contrast ratio of the first image may be changed based on the threshold gradation.

If the Referring to Figure 9, C = 2 and the information image is a gray character (L ^t = 0.2), any of the original image is less than the gray level is from 0 to 255 included in the pixel of the range, a threshold gray level (G ⁰ th) For the original image, the luminance of the first image and the luminance of the second image may be doubled. However, if the grayscale of the original image is ^greater than the threshold gradation (G ⁰ th), the luminance of the second image is saturated to a maximum value of 1 and can not increase any more. However, the composite image of the first image and the second image increases in brightness of the first image so as to satisfy the condition of Equation (8) in order to visualize the original image. Accordingly, the contrast ratio of the first image in the first region below the threshold gradation may be 5, based on the threshold gradation. On the other hand, the contrast ratio of the first image in the second region exceeding the threshold gradation may be in the range of 1 to 5.

According to Equation (9), the luminance of the first image or the threshold luminance (L ⁰ th) of the original image in which the luminance of the second image is 1 can be given. The threshold gradation may correspond to the threshold luminance (L ⁰ th). Since the luminance of the information image is zero, the threshold luminance may be given by the condition that the luminance of the second image is one.

If the Referring to Figure 10, C = 2 and the information image is a gray character (L ^t = 0.8), any of the original image is less than the gray level is from 0 to 255 included in the pixel of the range, a threshold gray level (G ⁰ th) For the original image, the luminance of the first image and the luminance of the second image may be doubled. However, if the gray level of the original image exceeds the threshold gray level (G ⁰ th), the brightness of the first image is saturated to 1, which is the maximum value, and can not increase any more. However, the combined image of the first image and the second image increases the brightness of the second image to satisfy the condition of Equation (8) in order to visually recognize the original image. Accordingly, the contrast ratio of the first image in the first region below the threshold gradation may be 1.25, based on the threshold gradation. On the other hand, the contrast ratio of the first image in the second region exceeding the threshold gradation may range from 1 to 1.25.

According to Equation (9), the luminance of the first image or the threshold luminance (L ⁰ th) of the original image in which the luminance of the second image is 1 can be given. The threshold gradation may correspond to the threshold luminance (L ⁰ th). Since the luminance of the information image is 0.8, the threshold luminance can be given by the condition that the luminance of the first image is 1.

11, the following C = 1.5 and the information image is a black character (L ^t = 0) of the case, any of the source image is a threshold gray level (G ⁰ th), and the gray level is containing the pixel in the range 0 to 255 For the original image, the luminance of the first image and the luminance of the second image may be doubled. However, if the grayscale of the original image is ^greater than the threshold gradation (G ⁰ th), the luminance of the second image is saturated to a maximum value of 1 and can not increase any more. However, the composite image of the first image and the second image increases in brightness of the first image so as to satisfy the condition of Equation (8) in order to visualize the original image. Therefore, the control ratio of the first image in the first region below the threshold gradation may be infinite, based on the threshold gradation. On the other hand, the contrast ratio of the first image in the second region exceeding the threshold gradation may range from 1 to infinity.

According to Equation (9), the luminance of the first image or the threshold luminance (L ⁰ th) of the original image in which the luminance of the second image is 1 can be given. The threshold gradation may correspond to the threshold luminance (L ⁰ th). Since the luminance of the information image is 0, the threshold luminance can be given by the condition that the luminance of the second image is 1.

12, the following C = 1.5 and the information image is a gray character (L ^t = 0.2) in the case, any of the source image is the gray level is, the threshold gray level (G ⁰ th) includes pixels ranging from 0 to 255 For the original image, the luminance of the first image and the luminance of the second image may be doubled. However, if the grayscale of the original image is ^greater than the threshold gradation (G ⁰ th), the luminance of the second image is saturated to a maximum value of 1 and can not increase any more. However, the composite image of the first image and the second image increases in brightness of the first image so as to satisfy the condition of Equation (8) in order to visualize the original image. Accordingly, the contrast ratio of the first image in the first region below the threshold gradation may be 5, based on the threshold gradation. On the other hand, the contrast ratio of the first image in the second region exceeding the threshold gradation may be in the range of 1 to 5.

According to Equation (9), the luminance of the first image or the threshold luminance (L ⁰ th) of the original image in which the luminance of the second image is 1 can be given. The threshold gradation may correspond to the threshold luminance (L ⁰ th). Since the luminance of the information image is 0, the threshold luminance can be given by the condition that the luminance of the second image is 1.

13 is a diagram illustrating a result of applying the variable contrast ratio image processing method according to an embodiment of the present invention.

Referring to FIG. 13, C = 2. The luminance of the cloud shape in the original image may be equal to or higher than the threshold luminance. Accordingly, the cloud shape in the first image can be saturated at the maximum luminance without being completely reproduced. Also, in order to express the cloud shape in the composite image, the brightness of the cloud portion in the second image is displayed as white rather than black.

14A and 14B are diagrams illustrating the concept of a system according to an embodiment of the present invention.

14A and 14B, only the person wearing the special glasses can view the caption, and a person who does not wear the special glasses can not see the caption.

When a stereoscopic display uses a shower glass, an example of the operation principle of the system according to the temporal example of the present invention is considered. The stereoscopic display using the shutter glass displays two frames corresponding to the view of the left eye and the right eye in order to derive the stereoscopic depth with a time difference of 16.7 msec do. The stereoscopic display may be a front projection type projector, a rear projection type, or a self-luminous type.

15A to 15C illustrate the operation principle of the present invention.

Referring to FIG. 15A, information on a source image and a subtitle are provided as indicated.

Referring to FIG. 15B, a first image and a second image displayed in the first frame and the second frame of the stereoscopic display are shown.

In the case of the first image of the first frame, the area where the caption is located is displayed as a black area. In the case of the second image of the second frame, the area outside the subtitle is displayed in black. Thus, each position of the active area of the stereoscopic display represents the information of the original image in the first frame or the second frame. The first frame of the first image and the second frame of the second image are sequentially repeated within 16.7 msec and an observer who does not wear the special glasses recognizes a combined image of the first frame and the second frame. Therefore, an observer who does not wear the special glasses can see a composite image substantially the same as the original image without the caption.

 Referring to FIG. 15C, shutter eyeglasses can be configured to transmit light in a first frame and block light in a second frame. As the left and right shutters of the shutter glasses transmit the same frame from the stereoscopic display, the temporal transmittance condition of the left and right shutters of the shutter glasses may be configured to be the same. If the observer wears the shutter glass, the observer can view only the first image of the first frame. Thus, the subtitles can view the first image represented by a black character.

16A and 16B are diagrams illustrating a process of generating a first image and a second image.

16A and 16B, SCENE and Mask-W correspond to the 2D original image and the information image, respectively. The first and second images were obtained by applying the above-described equations.

The subtitles are inserted into the image file of Mask-W, and the subtitles are displayed as black characters on a white background. The caption is inserted into the image file of Mask-B, and the image file of Mask-B in which the caption is displayed in white on the black background is prepared. Using the mask-W (Mask-W), an image masking process is applied to the original image. Thus, the pixel data at the position of the original image corresponding to the black region of the mask-W (Mask-W) is changed to black.

Accordingly, a first image is generated using the original image and the mask-W, and a second image is generated by mask image processing using the original image and the mask-B. The first image and the second image may be used as input signals of the first frame and the second frame, respectively. The image mask processing using Mask-W and Mask-B corresponds to an example of a method of creating the first image and the second image to display the black characters described above.

On the other hand, a similar concept can be applied to a stereoscopic display using polarizing glasses.

17 illustrates the principle of operation for a stereoscopic display using polarizing glasses.

Referring to FIG. 17, the light coming from the position of the caption and the light coming from the outside of the position of the caption are vertically polarized and provided to the polarizing glasses. The left polarizer and the right polarizer of the polarizing glasses are all polarized in the same direction. The observer who does not wear the polarized glasses can not distinguish the direction of polarization, so that the observer can not see the caption.

On the other hand, the polarizing glasses block the polarized light coming from the caption. The observer wearing the polarized glasses can view the subtitles as black characters.

A display method according to an embodiment of the present invention is applied to a stereoscopic display using polarizing glasses.

A stereoscopic display using a patterned retarder was used for the experiment to provide polarized light perpendicular to each other on horizontal even and horizontal odd lines. The pixel pitch and diagonal size of the stereoscopic display were 0.485 mm and 42 inches, respectively.

Stereoscopic displays use left-eye and right-eye images whether they use polarizing glasses or shutter glasses. Accordingly, the first image and the second image were used to prepare input signals of the left eye image and the right eye image of the stereoscopic display.

The left polarizer and the right polarizer of the polarizing glasses were made of the same circular polarizer. The stereoscopic display was observed in a state in which the polarized glasses were worn and a state in which the polarized glasses were not worn to determine the visibility of the captions.

The stereoscopic display uses a 3D format of Line-by-Line, in which horizontal even and horizontal odd lines represent information in two separate images.

 An input signal in line by line 3D format is generated from the first image and the second image. Accordingly, the horizontal odd-numbered line is composed of the first video and the horizontal even-numbered line is composed of the second video.

18 is an enlarged view of an input signal in which an area where the letter "u" of the subtitle "Seoul Tech "

The even lines of the horizontal black lines are outside the letter "u " while the odd lines of the horizontal black lines are inside the letter" u ". Thick bright lines and thick black lines of 2 pixel pitch may appear at the position where the outlines of the subtitles are in the horizontal direction.

In the enlarged portion of the input signal of Fig. 18, the outline of the letter "u" can be seen where the horizontal odd black line and the horizontal even black line meet.

If the thickness of such a black line is one pixel pitch, the outline of the letter "u" may be hardly visible to the eyes of an observer who is a few meters away. However, if a thick bright line or a thick black line is a two pixel pitch thick, it can be seen by a viewer a few meters away. These artifacts relate to the characteristics of a stereoscopic display employing a 3D technique that uses horizontal even and horizontal odd lines to represent different images, respectively.

In order to reduce such artifacts, since the artifacts occur in the region where the gradation changes abruptly, such as the boundary between the 0 gradation and the 255 gradation in the information image, lt; RTI ID = 0.0 > (intermediate gray level). < / RTI >

19 shows an example of an original information image and a modified information image.

Referring to Fig. 19, a horizontal gray line is inserted in the outline of the character "u " in the modified information image. In the image processing, the pixels of the intermediate luminance corresponding to the halftone of the character outline are displayed on the outer side of the black subtitle, so that rapid change of the luminance can be prevented.

20 is a view showing first and second images generated using the modified information image.

Referring to Fig. 20, an input signal of LbL 3D format is also displayed. In the input signal, a horizontal line of intermediate brightness may exist along the outline of the character "u " where thick bright lines and thick black lines are located. Using the modified information image, the artifact is reduced invisibly.

The subtitles are displayed in black letters. Therefore, if the subtitles are located in the dark region of the original image, the subtitles are difficult to read with a low contrast ratio compared to the case where the subtitles are located in the bright region of the original image. Thus, the position of the caption can be selected to be placed in the bright region of the original image.

The glasses used in the embodiment of the present invention are different from the glasses used in the stereoscopic display. In this technique, the left and right sides of the glasses are designed to transmit the same view from the stereoscopic display. Even in the case of a stereoscopic display using polarizing glasses, the required glasses can be provided at a low price. Even in the case of a stereoscopic display using a shutter glass, the temporal tranmittance of the left and right sides can be easily adjusted by an electric signal.

21 is a view illustrating a display device according to an embodiment of the present invention.

Referring to FIG. 21, a display device 10 includes a display 100 for displaying an image on a screen, and glasses 200 for viewing a first image including an information image. The display 100 is a kind of a 3D display device. The display 100 is a 3D display device that receives an image received from a photographing device such as a camera or a camera, edited / processed in a broadcasting station and then transmitted from a broadcasting station, And displays it on the screen. In particular, the display 100 may receive and display a 2D image or a 3D image. When the display 100 operates in the 3D mode, the left eye image and the right eye image can be displayed.

Meanwhile, the display 100 may operate in an image processing mode according to an embodiment of the present invention. The display refers to the 2D image format and processes the first image and the second image, and the processed first image is provided instead of the left eye image of the 3D display, and the second image is provided in place of the right eye image of the 3D display / RTI >

22 is a block diagram of a display in accordance with an embodiment of the present invention.

22, the display 100 according to the present embodiment includes an image receiving unit 110, an image processing unit 120, a display unit 130, a control unit 140, an information image unit 150, a storage unit 160 ), And a user command receiving unit 170. [

The image receiving unit 110 can receive and demodulate a broadcast received from a broadcasting station or satellite via a wired or wireless network. The image receiving unit 110 may be connected to an external device such as a camera and receive an input signal from an external signal input unit. External devices can be connected wirelessly or wired via interfaces such as S-Video, Component, Composite, D-Sub, DVI, and HDMI.

The image receiving unit 110 can demodulate, demultiplex, decode, and scale the input signal. Through the demultiplexing process, the subtitle signal, the audio signal, and other information can be separated from the video signal. The caption signal and the other information may be provided to the information video unit. The decoded video signal may be in various formats.

The decoded video signal may be a YCrCb format or an RBG format. If the decoded image signal is a 3D image, the decoded image may be in a side-by-side format or a top-down format. The image signal may be a left- The left eye image and the right eye image may be the same when the decoded image signal is a 2D image. Alternatively, when the decoded image signal is a 2D image, the left eye image and the right eye image may be separated, Only one of the video signal for the right eye and the right eye can be generated.

The image receiving unit 110 processes the decoded image and generates a 2D original image in RGB format and transmits the 2D original image to the image processing unit 120. [ The decoding scheme depends on the encoding scheme, and a compression scheme such as MPEG or H.264 may be used as the encoding scheme.

The image receiving unit 110 may perform signal processing such as demodulation, video decoding, format analysis, and video scaling on the received input signal. The image receiving unit 110 may generate an original image of RGB format corresponding to a size of one screen (1920 x 1080) using the format of the input image.

The image processing unit 120 may receive the original image and receive the information image from the information image unit. The image processor combines the information image and the original image to generate a first image and a second image, respectively. The operation of the image processing unit is described in Equations (1) to (6). The first image may be provided instead of the left eye image signal of the display unit. Also, the second image may be provided instead of the right eye image signal of the display unit.

The display unit 130 may display a first image and a second image using a shutter system or a first image and a second image using a polarizing glasses system. The display unit 130 operates in a similar manner to the 3D display, but does not form a stereoscopic image in the first image corresponding to the left eye image and the second image corresponding to the right eye image.

The information image unit 150 generates an information image including information that can be viewed only by the observer wearing the special glasses. The information display unit 150 may receive the caption information from the image receiver 110 to generate an information image. In addition, the information display unit 150 may generate an information image for a graphic user interface (GUI) that can be viewed only by an observer wearing special glasses. The information display unit 150 may include at least one of caption information, text information, news information, time information, GUI information, menu information, and image information.

The information image generated by the information image unit 150 is provided to the image processing unit 120. Accordingly, the image processing unit may generate the first image and the second image by combining the information image and the 2D original image. The first image and the second image are observed by an observer who does not wear the special glasses, and the observer who does not wear the special glasses can observe the first image and the second image, 2 images. ≪ / RTI >

The storage unit 160 is a storage medium storing various programs and the like, and can be implemented as a memory, a hard disk drive (HDD), or the like.

The display unit may be a glasses type 3D TV, a glasses type 3D monitor, a glasses type 3D projector, or a 3D electronic blackboard. The display unit may be an LCD, a PDP, a projector, or an OLED.

The user command receiving unit 170 transmits a user command received from an input means such as a remote controller to the controller 140.

The controller 140 controls the overall operation of the display 100 according to a user command received from the user command receiver 170. The display may operate in a 2D mode, a 3D mode, and a hyperevel mode according to an embodiment of the present invention.

In the 2D mode, an input signal is provided as a 2D image, and the image receiver decodes a 2D image. The display unit can be adjusted so that an observer who does not wear glasses can view a 2D image. For example, when the display unit is a polarizing type, the same 2D image is provided to odd rows and even rows. For example, when the display unit is the shutter type, the second frame having the time difference from the first frame provides the same 2D image.

In the 3D mode, the input signal is provided with a 3D image, and the image receiving unit decodes the 3D image. Accordingly, a left eye image and a right eye image with disparity are generated, and a left eye image and a right eye image are displayed according to a shutter system or a polarization system.

In the image processing mode according to an embodiment of the present invention, when the input signal is a 3D image, the image processing unit can receive one of the left eye image and the right eye image as an original image. Accordingly, the image processor combines the information image and the original image, and provides the first image and the second image to the display unit. For example, when the display unit operates in a shutter mode, the left eye shutter and the right eye shutter of the eyeglasses are synchronized to transmit only the first image. Meanwhile, when the display unit operates in the polarizing mode, the left-eye and right-eye polarized lights of the glasses must have the same polarization state so as to transmit only the first image.

In the case of the image processing mode according to the embodiment of the present invention, when the input signal is a 2D image, the image receiving unit provides the decoded 2D image as the original image to the image processing unit without generating the left eye image and the right eye image . The image processing unit combines the 2D original image and the information image to generate a first image and a second image.

In the case of the image processing mode according to an embodiment of the present invention, input signals processed by the first and second images encoded through the external signal input unit may be provided. In this case, the image receiver performs decoding and analyzes the format of the decoded image signal. If the decoded image is divided into a first image and a second image, the decoded image may be provided to the image processing unit. The image processing unit may provide the first image and the second image to the display unit.

In the case of the image processing mode according to an embodiment of the present invention, input signals processed by the first and second images encoded through the external signal input unit may be provided. In this case, the image receiving unit may separate the image signal into the first image and the second image and be provided to the image processing unit. The image processing unit may provide the first image and the second image to the display unit. In this case, the original image can be created from the first image and the second image. The original image thus created can be provided to the display unit in the 2D mode. When the information image is changed, the first image and the corrected second image may be processed using the original image and the information image, and the image and the modified second image may be provided to the image processing unit. The image processing unit may provide the first image and the second image to the display unit.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

100: Display
200: glasses

Claims (21)

delete delete Preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and luminance (Lr ^t , Lg ^t , Lb ^t ) of the information image;
And combining the original image and the information image to generate a first image and a second image,
Wherein the sum of the luminance of the first image (Lr ¹ , Lg ¹ , Lb ¹ ) and the luminance of the second image (Lr ² , Lg ² , Lb ² ) is a predetermined multiple of the luminance of the original image,
The brightness of the first image and the brightness of the second image are

, ≪ / RTI >
Where H is the luminance enhancement coefficient,
Lr ¹ is the luminance of the red subpixel in the first image, Lg ¹ is the luminance of the green subpixel in the first image, Lb ¹ is the luminance of the blue subpixel in the first image,
Lr ² is the luminance of the red subpixel in the second luminance image, Lg ² is the luminance of the green subpixel in the second luminance image, Lb ² is the luminance of the blue subpixel in the second luminance image,
Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, Lb ⁰ is the luminance of the blue subpixel of the original image,
The brightness of the first image is

, ≪ / RTI >
Where H is the luminance enhancement coefficient,
Lr ¹ is the luminance of the red subpixel in the first image, Lg ¹ is the luminance of the green subpixel in the first image, Lb ¹ is the luminance of the blue subpixel in the first image,
Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, Lb ⁰ is the luminance of the blue subpixel of the original image,
Lr ^t is the luminance of the red subpixel of the information image, Lg ^t is the luminance of the green subpixel of the information image, and Lb ^t is the luminance of the blue subpixel of the information image. The method of claim 3,
Wherein the luminance enhancement coefficient H is a value between 0 and 0.4. Preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and luminance (Lr ^t , Lg ^t , Lb ^t ) of the information image;
And combining the original image and the information image to generate a first image and a second image,
Wherein the sum of the luminance of the first image (Lr ¹ , Lg ¹ , Lb ¹ ) and the luminance of the second image (Lr ² , Lg ² , Lb ² ) is a predetermined multiple of the luminance of the original image,
The brightness of the first image and the brightness of the second image are

, ≪ / RTI >
Where H is the luminance enhancement coefficient,
Lr ¹ is the luminance of the red subpixel in the first image, Lg ¹ is the luminance of the green subpixel in the first image, Lb ¹ is the luminance of the blue subpixel in the first image,
Lr ² is the luminance of the red subpixel in the second luminance image, Lg ² is the luminance of the green subpixel in the second luminance image, Lb ² is the luminance of the blue subpixel in the second luminance image,
Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, Lb ⁰ is the luminance of the blue subpixel of the original image,
The brightness of the second image is

, ≪ / RTI >
Where H is the luminance enhancement coefficient,
Lr ² is the luminance of the red subpixel in the second luminance image, Lg ² is the luminance of the green subpixel in the second luminance image, Lb ² is the luminance of the blue subpixel in the second luminance image,
Lr ⁰ is the luminance of the red subpixel of the original image, Lg ⁰ is the luminance of the green subpixel of the original image, Lb ⁰ is the luminance of the blue subpixel of the original image,
Lr ^t is the luminance of the red subpixel of the information image, Lg ^t is the luminance of the green subpixel of the information image, and Lb ^t is the luminance of the blue subpixel of the information image.
delete Preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and luminance (Lr ^t , Lg ^t , Lb ^t ) of the information image;
And combining the original image and the information image to generate a first image and a second image,
Wherein the sum of the luminance of the first image (Lr ¹ , Lg ¹ , Lb ¹ ) and the luminance of the second image (Lr ² , Lg ² , Lb ² ) is a predetermined multiple of the luminance of the original image,
The brightness of the first image and the brightness of the second image are

, ≪ / RTI >
Where C is a constant in the range of 1 to 2,
The brightness of the first image and the brightness of the second image are

Of the image data. Preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and luminance (Lr ^t , Lg ^t , Lb ^t ) of the information image;
And combining the original image and the information image to generate a first image and a second image,
Wherein the sum of the luminance of the first image (Lr ¹ , Lg ¹ , Lb ¹ ) and the luminance of the second image (Lr ² , Lg ² , Lb ² ) is a predetermined multiple of the luminance of the original image,
The brightness of the first image and the brightness of the second image are

, ≪ / RTI >
Where C is a constant in the range of 1 to 2,
The brightness of the first image and the brightness of the second image are

, ≪ / RTI >
Wherein C is a constant in the range of 1-2. delete delete delete delete delete delete Preparing luminance (Lr ⁰ , Lg ⁰ , Lb ⁰ ) of the original image and luminance (Lr ^t , Lg ^t , Lb ^t ) of the information image;
And combining the original image and the information image to generate a first image and a second image,
Wherein the sum of the luminance of the first image (Lr ¹ , Lg ¹ , Lb ¹ ) and the luminance of the second image (Lr ² , Lg ² , Lb ² ) is a predetermined multiple of the luminance of the original image,
Providing the first image as either a left eye image or a right eye image of a 3D display; And
Providing the second image as any one of a left eye image or a right eye image of the 3D display,
The 3D display is a polarization type,
The 3D display uses a line by line 3D format,
Wherein an intermediate gray level region is inserted along an outline of the boundary in order to reduce an artifact at a border where the gradation is abruptly changed in the information image. delete delete delete delete delete delete

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