KR20110135053A - Method for approving image quality of 3 dimensional image and digital broadcast receiver thereof - Google Patents

Abstract

PURPOSE: A method for improving the quality of a 3D image and a digital broadcasting receiver are provided to display an optimum 3D image to an individual user by considering the eyesight of the user. CONSTITUTION: A digital broadcasting receiver receives a 3D video signal(410). The digital broadcasting receiver controls an image quality setting value suitable for the eyesight of an individual user(420). The image quality setting value is applied to left and right images in the 3D image signal. The digital broadcasting receiver applies the controlled image quality setting value to the received 3D image signal(430). The digital broadcasting receiver displays the 3D image signal(440).

Description

Method for Improving 3D Image Quality and Its Digital Broadcast Receiver {METHOD FOR APPROVING IMAGE QUALITY OF 3 DIMENSIONAL IMAGE AND DIGITAL BROADCAST RECEIVER THEREOF}

The present invention relates to a method for improving image quality of a 3D image and a digital broadcast receiver according to the above, and more particularly, to a method for improving image quality of a 3D image that can optimize the image quality of a 3D image signal according to a user's vision and A digital broadcast receiver.

Currently, the broadcasting environment is rapidly changing from analog broadcasting to digital broadcasting. Accordingly, the amount of content for digital broadcasting is increasing rapidly. In addition to the content for displaying a two-dimensional (2D) video signal as a two-dimensional image as a content for digital broadcasting, content that displays a three-dimensional (3D) video signal as a three-dimensional image is produced and It is planned. Hereinafter, content displaying a 3D image signal as a 3D image is referred to as 3D content.

According to the production and planning of three-dimensional content, a display apparatus capable of viewing three-dimensional content is provided, and the production and planning of three-dimensional content continues to increase.

Accordingly, there is a need for a method capable of displaying three-dimensional images with high image quality and a digital broadcast receiver accordingly.

An object of the present invention is to provide a method for improving image quality of a 3D image capable of displaying a 3D image having an image quality optimized for an individual user in consideration of the eyesight of the individual user, and a digital broadcast receiver accordingly.

According to an embodiment of the present invention, a method for improving image quality of a 3D image includes: receiving a 3D image signal; Adjusting an image quality setting value of each of the left and right images included in the 3D image signal according to an individual user's eyesight; And outputting the adjusted 3D image signal by applying the adjusted image quality setting value.

Preferably, the adjusting of the image quality setting to the visual acuity of the individual user may include color, brightness, sharpness, contrast, or chroma of each of the left and right images. Adjusting at least one of the at least one of the eyes according to the individual user.

Preferably, the method for improving the quality of a 3D image according to an embodiment of the present invention may further include measuring the visual acuity of the individual user.

Preferably, measuring the visual acuity of the individual user comprises displaying a visual acuity table as a two-dimensional image; And measuring the visual acuity of the individual user by using the displayed visual acuity chart.

Preferably, the step of measuring the visual acuity of the individual user by using the eye test table to measure the left eye of the individual user by opening only the left shutter of the shutter glasses, and by opening only the right shutter of the shutter glasses of the individual user And measuring right eye vision.

Preferably, adjusting the image quality setting value according to the visual acuity of the individual user may include automatically adjusting the image quality setting value of each of the left and right images according to the measured visual acuity of the individual user.

Preferably, the adjusting to the visual acuity of the individual user may include displaying a plurality of three-dimensional images having different image quality setting values simultaneously or at predetermined time intervals; Selecting a 3D image corresponding to the left eye or right eye vision of the individual user from the plurality of 3D images; And applying an image quality setting value of the selected 3D image to the left or right image included in the received 3D image signal.

Preferably, the adjusting to the visual acuity of the individual user may include: outputting OSD (On Screen Display) data including an adjustment bar for switching a screen between a plurality of three-dimensional images having different image quality setting values; Selecting a three-dimensional image among the plurality of three-dimensional images corresponding to the left or right eye vision of the individual user; And applying an image quality setting value of the selected 3D image to the left or right image included in the received 3D image signal.

Preferably, the method for improving image quality of a 3D image according to an embodiment of the present invention may further include receiving visual information of the individual user through a user interface. The adjusting to the visual acuity of the individual user may include adjusting the image quality setting value according to the visual acuity information of the individual user.

Preferably, the image quality improvement method of the 3D image according to an embodiment of the present invention may further include displaying the 3D image signal to which the adjusted image quality setting value is applied as a 3D image.

Preferably, the method of improving the quality of a 3D image according to an embodiment of the present invention may further include storing an image quality setting value corresponding to vision information.

A digital broadcast receiver according to an embodiment of the present invention includes a signal input unit for receiving a 3D video signal; And a control unit adjusting the image quality setting values of the left and right images included in the 3D image signal according to the visual acuity of the individual user, and controlling the output of the received 3D image signal by applying the adjusted image quality setting values. It includes.

Preferably, the digital broadcasting receiver according to an embodiment of the present invention may further include a scaler for applying the adjusted image quality setting value to the received 3D image signal and outputting the received 3D image signal in response to the control of the controller.

Preferably, the digital broadcast receiver according to an embodiment of the present invention may further include a display unit for displaying the left image or the right image. Herein, the controller may control the left or right shutters of the shutter glasses that are externally provided in the digital broadcast receiver to be selectively opened or closed in response to the display of the left or right image.

According to an embodiment of the present invention, a method for improving image quality of a 3D image and a digital broadcast receiver according to the present invention may display a 3D image having an optimized image quality for an individual user in consideration of the eyesight of the individual user.

According to an embodiment of the present invention, a method for improving image quality of a 3D image and a digital broadcast receiver according to the present invention can minimize the occurrence of image screen distortion that may occur due to a difference in binocular vision of an individual user when viewing 3D content. . Accordingly, individual users can be more comfortably watched three-dimensional content.

1 is a diagram for describing single video stream formats among transmission formats of a 3D video signal.
FIG. 2 is a diagram for describing multi video stream formats among transmission formats of a 3D video signal.
3 is a block diagram illustrating a digital broadcast receiver according to an embodiment of the present invention.
4 is a flowchart illustrating a method of improving image quality of a 3D image according to an embodiment of the present invention.
FIG. 5 is a diagram for describing an operation of measuring an eyesight of an individual user using shutter glasses.
FIG. 6 is a diagram for describing an operation of measuring an eyesight of an individual user using shutter glasses.
7 is a diagram illustrating a screen configuration displayed in the image quality improving method according to an embodiment of the present invention.
FIG. 8 is a diagram for describing an operation of adjusting one image quality setting value in step 420 of FIG. 4.
9 is a view for explaining another image quality setting value adjusting operation in step 420 of FIG.
FIG. 10 is a diagram for describing another image quality setting value adjusting operation in step 420 of FIG. 4.
FIG. 11 is a diagram for describing an image quality setting value adjusting operation in step 420 of FIG. 4.
FIG. 12 is a diagram for describing an operation of adjusting image quality setting values in step 420 of FIG. 4.
FIG. 13 is a diagram illustrating a method of improving image quality of a 3D image according to an embodiment of the present invention and a database of visual quality setting values for each visual acuity that can be used in a digital broadcast receiver.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention that can specifically realize the above object will be described. At this time, the configuration and operation of the present invention shown in the drawings and described by it will be described as at least one embodiment, by which the technical spirit of the present invention and its core configuration and operation is not limited.

The terms used in the present invention have been selected as general terms widely used as possible in consideration of the functions in the present invention, but may vary according to the intention or custom of a person skilled in the art or the emergence of a new technology. In addition, in certain cases, there is also a term arbitrarily selected by the applicant, in which case the meaning will be described in detail in the description of the invention. Therefore, it is intended that the terms used in the present invention should be defined based on the meanings of the terms and the general contents of the present invention rather than the names of the simple terms.

The present invention provides a method for improving image quality of a 3D image and automatically adjusting the image quality setting value according to the visual acuity of an individual user in the process of displaying a 3D image (hereinafter referred to as '3D') and a digital broadcast receiver accordingly. I would like to.

Hereinafter, in describing the technical idea of the present invention, for convenience of description, a digital broadcasting receiver capable of processing a 3D image, which is a 3D image, sequentially shows a left image and a right image as an example. Will be explained.

In connection with the present invention, the following briefly describes the three-dimensional image.

Three-dimensional images include stereo (or stereoscopic) images considering two viewpoints and multi-view images considering three or more viewpoints. The stereo image refers to a pair of left and right images obtained by photographing the same subject with a left camera and a right camera spaced apart from each other by a certain distance. The multi-view image refers to three or more images obtained by photographing the same subject with three or more cameras having a constant distance or angle.

The stereo video transmission formats include a single video stream format and a multi video stream format.

The single video stream format and the multi video stream formats are described in detail with reference to FIGS. 1 and 2.

1 is a diagram for describing single video stream formats among transmission formats of a 3D video.

Single video stream formats include side by side, top / down, interlaced, frame sequential, checker board, or anaglyph. Etc.

Referring to FIG. 1A, FIG. 1A shows a side by side format. In the side-by-side format, the left image and the right image are each subsampled in the horizontal direction by 1/2, and the sampled left image is placed on the left side and the sampled right image is placed on the right side to make one stereo image.

Referring to FIG. 1B, FIG. 1B shows a top / down format. The top / down format is a case where one stereo image is created by sub-sampling the left image and the right image in the vertical direction, and placing the sampled left image at the top and the sampled right image at the bottom.

Referring to FIG. 1C, FIG. 1C shows an interlaced format. In the interlaced format, the left image and the right image are 1/2 subsampled in the vertical direction, respectively, and a stereo image is generated by alternately placing pixels of the sampled left image and pixels of the right image for each line. Alternatively, the left image and the right image are each 1/2 subsampled in the horizontal direction, and the pixels of the sampled left image and the pixel of the right image are alternately positioned one pixel to create a stereo image.

Referring to FIG. 1D, FIG. 1D shows a frame sequential format. The frame sequential format does not subsample the left image and the right image, but creates a stereo image by sequentially displaying the left image and the right image as one frame.

Referring to FIG. 1E, FIG. 1E illustrates a checker board format. The checker board format creates a stereo image by sub-sampling the left image and the right image 1/2 in the vertical and horizontal directions, and positioning the pixels of the sampled left image and the pixels of the right image alternately one pixel.

FIG. 2 is a diagram for describing multi video stream formats among transmission formats of a 3D video signal.

The multi video stream format includes full left / right, full left / half right, or 2D video / depth.

Referring to FIG. 2A, FIG. 2A shows a full left / right format. The full left and right formats sequentially transmit left and right images, respectively.

Referring to FIG. 2B, FIG. 2B shows a full left / half right format. In the full left / half right format, the left image is left as it is, and the right image is 1/2 subsampled and transmitted in the vertical or horizontal direction.

Referring to FIG. 2C, FIG. 2C shows a 2D video / depth format. The 2D video / depth format transmits depth information for generating one image of the left image and the right image and the other image.

Stereo images or multi-view images are compressed and encoded by MPEG or various methods and transmitted to a receiving system. The receiving system may be a digital broadcast receiver.

For example, a stereo image such as a side by side format, a top / down format, an interlaced format, a checker board, and the like may be compressed and transmitted by H.264 / AVC. In this case, a 3D image may be obtained by decoding the stereo image in the inverse of the H.264 / AVC coding scheme in the reception system.

In addition, one of a left image or a multiview image of a full left / half right format is assigned to a base layer image, and the other image is assigned to an enhanced layer image, and then the base layer image is mono. Encoding is performed in the same manner as the scopic video, and an upper layer video may be encoded and transmitted only with respect to correlation information between a base layer and an upper layer.

As an example of the compression encoding scheme for the image of the base layer, a JPEG, MPEG-1, MPEG-2, MPEG-4, H.264 / AVC scheme may be used. In addition, a compression encoding scheme for an upper layer video may use a H.264 / MVC (Multi-view Video Coding) scheme. In this case, the stereo image is allocated to the base layer image and one higher layer image, but the multiview image is allocated to the base layer image and the plurality of higher layer images. The criterion for dividing the multiview image into an image of the base layer and an image of one or more higher layers may be determined according to the position of the camera or may be determined according to the arrangement of the cameras. Or may be arbitrarily determined without following special criteria.

In general, a 3D image (or 3D image) is based on a stereo vision principle of two eyes. The binocular parallax is an important factor in making the stereoscopic sense, and when the planar image of the left and right eyes are respectively connected, the brain can fuse these two different images to reproduce the depth and reality of the 3D image. Here, binocular disparity refers to the disparity of two eyes, and means the difference between the left and right eyes visible according to the distance between the two eyes that are about 65mm apart.

The 3D image display is largely divided into a stereoscopic method, a volumetric method, and a holographic method. For example, a digital broadcast receiver capable of displaying a 3D video signal using stereoscopic technology adds depth information to a 2D image, and the viewer can feel stereoscopic liveness and reality using the depth information. It is a video display device.

In addition, there are two methods of displaying three-dimensional images, a method of wearing glasses and a glasses-free method of not wearing glasses. The way of wearing the glasses is divided into passive and active methods.

In this case, the passive method distinguishes between the left image and the right image using a polarization filter. In other words, the passive method is to wear blue and red sunglasses on both eyes. The active method distinguishes left and right eyes using a liquid crystal shutter, and distinguishes between a left image and a right image by sequentially covering the left eye (left eye) and the right eye (right eye) in time. That is, the active method is a method of wearing and viewing glasses with an electronic shutter that is periodically repeated and synchronized with the time-divided screen, and may also be referred to as a time split type or shuttered glass method. Hereinafter, the glasses driven by the shuttered glass method are referred to as shutter glasses.

Representative examples of glasses-free glasses-free methods include a lenticular method in which a lenticular lens plate in which a cylindrical lens array is arranged vertically is installed in front of the image panel, and a barrier layer having a periodic slit on the image panel. There is a parallax barrier (parallax barrier) method having a.

In the following specification, in order to more easily describe the technical idea of the present invention, a stereoscopic method of a stereoscopic display method is taken as an example, and an active method of the stereoscopic method is described as an example. However, hereinafter, the shutter glasses will be described as an example of the active type media, but the present invention is not limited thereto, and the present invention can be applied to other media as described below.

As described above, in the case of the active method, when the image for the left eye is displayed through the digital broadcast receiver, the left shutter of the shutter glasses is opened, and the image for the right eye is displayed through the digital broadcast receiver. In this case, open the right shutter.

3 is a block diagram illustrating a digital broadcast receiver according to an embodiment of the present invention.

Referring to FIG. 3, the digital broadcast receiver 300 according to the present invention includes a signal input and processing unit 310, a formatter 330, an infrared emitter (IR emitter: Infra-Red emitter) 335, and a controller. And a controller 350, a user interface unit 360, and a display unit 370. Digital broadcast receivers include digital televisions or set-top boxes. In addition, the digital broadcast receiver 300 may further include shutter glasses 340. In addition, the shutter glasses 340 may be provided separately from the digital broadcast receiver 300.

In addition, the signal input and processing unit 310 may include a signal input unit (for example, a tuner 311), a demodulator 313, a demultiplexer 315, and a decoder and scaler ( 320). The decoder and scaler 320 may include a video decoder 321, an audio decoder 323, a scaler 325, and a video processor 327. Can be.

In addition, the digital broadcast receiver 300 may further include other necessary components in addition to the configuration shown in FIG. 1.

3 illustrates a tuner 311 as a signal input unit for receiving an image signal to be displayed as an example. The tuner 311 selectively receives a broadcast signal including predetermined content transmitted in the form of a radio frequency (RF) signal through a channel of a predetermined frequency band. That is, the tuner 311 selectively receives a broadcast signal transmitted from a content producer such as a broadcast station. Also, the signal input unit for receiving an image signal to be displayed may be a network interface unit (not shown) that receives content from a content provider (CP).

The demodulator 313 demodulates the broadcast signal input from the tuner 311.

The demultiplexer 315 demultiplexes an audio signal, a video signal, and additional information from the demodulated broadcast signal. Here, the additional information may be SI (System Information) information such as PSI / PSIP (Program Specific Information / Program and System Information Protocol).

The demultiplexer 315 outputs the demultiplexed audio signal and the video signal to the decoder and the scaler 320, and outputs additional information to an additional information processor (not shown).

The video decoder 321 and the audio decoder 323 respectively receive and process the demultiplexed audio signal and the video signal.

The scaler 325 scales the signal processed by the decoder 321 and the audio decoder 323 into a signal of an appropriate size for output through the display unit 370 or the speaker unit (not shown).

In addition, the scaler 325 applies the image quality setting values applied to display the 3D image to the left and right images according to the 3D image signal to be displayed, respectively. Here, the image quality setting value may be specifically adjusted or set by the control unit 350, and the scaler 325 may be left and right according to a 3D image signal to display a predetermined image quality setting value under the control of the control unit 350. Each output is applied to an image. In this case, an operation of applying a predetermined image quality setting value to the left and right images according to the 3D image signal to be displayed may be performed by the formatter 330 instead of the scaler 325.

The formatter 330 converts the video and audio signals output from the decoder and the scaler 320 according to the output format of the display unit 370. Here, when displaying the 2D content, the formatter 330 passes the received signal without performing the conversion function. When the 3D content is displayed, the 3D content may be operated as a 3D formatter that processes the 3D content according to the format of the 3D content and the output frequency of the display unit 370 under the control of the controller 350.

The formatter 330 outputs the converted image signal to the display unit 370 to implement the 3D stereoscopic image, generates a vertical synchronization signal Vsync for the output 3D image signal, and outputs the infrared output unit 335. Will output Here, the vertical synchronization signal Vsync is a signal for synchronizing the display time of the left image or the right image according to the 3D image signal with the opening and closing time of the left eye lens or the right eye lens of the shutter glasses 340.

The infrared output unit 335 receives a vertical synchronization signal output from the formatter 330 and transmits the vertical synchronization signal to a light receiving unit (not shown) in the shutter glasses 340.

The shutter glasses 340 adjusts the shutter open period according to the vertical synchronization signal Vsync received through an internal light receiving unit (not shown).

The shutter glasses 340 include a left eye shutter liquid crystal panel (left eye lens) and a right eye shutter liquid crystal panel (right eye lens). The shutter liquid crystal panels perform a function of simply passing or blocking light according to source driving voltages supplied to both electrodes of the liquid crystal panel.

When a left image is displayed on the display surface of the digital broadcast receiver, the left eye shutter liquid crystal panel passes light and the right eye shutter liquid crystal panel blocks light transmission. Accordingly, the left image is transmitted only to the left eye of the spectacles user. When the right image is displayed on the display surface of the digital broadcast receiver, the left eye shutter liquid crystal panel blocks light transmission, and the right eye shutter liquid crystal panel passes light. Accordingly, the right image is delivered only to the user's right eye.

In this process, the infrared receiver (not shown) provided internally of the shutter glasses 340 converts an infrared signal transmitted from the infrared output unit 335 into an electrical signal, and a controller provided internally of the shutter glasses 340. (Not shown) controls the left eye shutter liquid crystal panel and the right eye shutter liquid crystal panel to be turned on and off alternately according to the converted infrared signal.

The controller 350 controls the overall operation of the digital broadcast receiver 300. In detail, a broadcast signal including predetermined content may be displayed on an image screen.

In detail, the control unit 350 may receive visual information of each of the left and right eyes of each user input through the user interface unit 360, and adjust the image quality setting value of the 3D image signal according to the visual acuity information. The adjusted image quality setting value may be applied to the 3D image signal to be displayed and output.

In addition, the control unit 350 allows the eye test table to be displayed on the display screen of the display unit 370 and receives eye test data of the individual user input corresponding to the displayed eye test table through the user interface unit 360. Can be. The visual acuity of the individual user may be measured according to the received visual acuity test data, and the image quality setting values of the left and right images of the 3D image signal to be displayed may be adjusted according to the visual acuity. Accordingly, the adjusted image quality setting value may be applied to the 3D image signal to be displayed and output.

Here, the eye test table may be displayed as a 2D image for accurate eye test. In addition, the controller 350 outputs OSD (On Screen Display) data including a message (eg, 'keep 2m away from the display screen', 'enter the displayed number', etc.) necessary for the vision test. Can be controlled. Then, the OSD generator 335 generates predetermined OSD data under the control of the controller 360 and outputs the OSD data to the display unit 370. The display unit 370 displays the output OSD data in a predetermined area of the display screen. can do.

The OSD generator 355 generates predetermined OSD data and outputs the same to the display unit 370. In detail, the OSD generation unit 355 generates OSD (On Screen Display) data for adjusting the quality setting value of the 3D image signal displayed under the control of the control unit 350. In addition, various types of information to be provided to the user may be generated in the form of OSD data. The generated OSD data may be directly transmitted to the display unit 370 to be displayed as a 2D image, or may be transmitted to the formatter 330 and converted into a 3D image to be displayed as a 3D image.

The user interface 360 generates and outputs data to be provided to the user, or receives a predetermined request or predetermined information from the user. In detail, the user interface 360 may output OSD data or an image screen for adjusting the image quality setting value of the 3D image signal, and receive the user's vision information from the user.

The display unit 370 displays a 3D image signal transmitted through the formatter 330 as a 3D image. In addition, the 2D image signal output by the decoder and the scaler 320 may be displayed by simply passing through the formatter 330 or without passing through the formatter 330.

The storage unit 380 may store various pieces of information necessary for a display operation.

The digital broadcast receiver 300 according to an embodiment of the present invention has the same technical spirit as the method of improving the quality of a 3D image, which will be described below with reference to FIGS. 4 to 13. Therefore, detailed operations of the digital broadcast receiver 300 will be described in detail below.

4 is a flowchart illustrating a method of improving image quality of a 3D image according to an embodiment of the present invention.

Referring to FIG. 4, in a method of improving image quality of a 3D image according to an embodiment of the present invention, a 3D image signal is received (step 410). The 3D image signal may be received through the tuner 311.

The image quality setting values applied to each of the left and right images included in the 3D image signal are adjusted according to the visual acuity of the individual user (step 420).

If the left eye and the right eye view the same image at the same time, even if there is a difference in left and right vision, the user's brain corrects the image with the average value of the image received by the left and right eyes. That is, in the case of a two-dimensional image in which the left eye and the right eye simultaneously recognize the image without a predetermined time interval, even though there is a difference in left and right eyesight, the user finally recognizes the image corrected by the average value in the brain. Distortion does not occur in the image to be recognized.

When viewing the 3D image displayed according to the active method of the stereoscopic method through the shutter glasses, the user visually recognizes the left image through the left eye, and the predetermined time interval (for example, the left image and the right image are 60 Hz, respectively). If it is displayed as a signal of, visually perceive the right image into the right after 1/60 second intervals.

In the case of such a 3D image, when a difference in visual acuity occurs in the left and right sides of the user, the left image and the right image received independently in time are finally recognized by the user without correction. Therefore, a user who has a difference in vision between the left eye and the right eye finally recognizes an image in which distortion occurs. The distortion of an image caused by a difference in visual acuity includes a screen overlapping phenomenon that may be caused by a focal length mismatch between the left and right eyes.

According to an embodiment of the present invention, a method for improving image quality of a 3D image by optimizing and adjusting the image quality setting values applied to each of the left image and the right image according to the eyesight of an individual user watching the 3D image, The phenomenon can be reduced or eliminated.

In addition, even if there is no difference in visual acuity between the left and right eyes of the individual user, when the visual acuity of the user is low, an image with low sharpness is recognized. In this case, the method of improving the quality of a 3D image according to an embodiment of the present invention enables the user to recognize a high quality 3D image by readjusting image quality setting values such as sharpness according to an individual user's eyesight.

Here, the image quality setting value is a setting value of all the image quality elements applied to the 3D image, and the setting values such as color, brightness, sharpness, contrast, or saturation are used. It may include.

For example, when the left eye of an individual user viewing a 3D image according to the corresponding content is lower than the right eye of the user, the sharpness of the left image is increased compared to the sharpness of the right image. The left and right images each having the same sharpness can be recognized.

Operation of adjusting the image quality setting value in step 420 will be described in detail with reference to FIGS. 5 to 12.

The method of improving the quality of a 3D video signal according to an embodiment of the present invention may further include measuring an eye of an individual user (not shown). In addition, the step of measuring the eyesight of the individual user may be disposed before step 420, displaying the eyesight test table as a two-dimensional image (not shown), and measuring the eyesight of the individual user by using the displayed eyesight table. It may include a step (not shown). In addition, prior to the step of measuring the eyesight of the individual user, the step of outputting the OSD (On Screen Display) data for selecting whether to measure the eyesight of the individual user and the vision measurement request input corresponding to the OSD data The method may further include receiving an input through the interface unit 360.

Here, the OSD data may be generated by the OSD generator 355 and displayed on the display screen as a 3D image or a 2D image.

Selection of whether to measure the eyesight may be made by a user's remote controller (not shown) or a user input unit (not shown). Here, the remote controller is a device for remotely controlling the digital broadcast receiver 300 and may transmit and receive a signal wirelessly with the digital broadcast receiver 300. In addition, the user input unit (not shown) is provided internally of the digital broadcast receiver 300, and the user may input predetermined information or a command to the digital broadcast receiver through the user input unit. The user input unit transmits the received information or command to the control unit 350 so that an operation or command requested by the user can be performed.

In addition, the displaying of the eye test table as a two-dimensional image may output a warning document such as 'keeping a distance of 2 m during visual inspection' on the display screen as OSD (On Screen Display) data. The visual acuity chart displayed is a visual acuity chart satisfying standardized visual acuity standards.

Measuring the visual acuity of the individual user will be described in detail with reference to FIG. 5 below.

5 is a view for explaining the measurement of the eyesight of the individual user using the shutter glasses.

Referring to FIG. 5, when the eyesight of the left eye is measured first, an eyesight test table is displayed as a two-dimensional image on the screen 510, and the left eye shutter liquid crystal panel 341 of the shutter glasses 340 transmits light. The right eye shutter liquid crystal panel 343 blocks light. The user sees an eye examination table with the left eye shutter liquid crystal panel 341 through which light is transmitted, and inputs a number or symbol activated (not shown) on the eye examination table into the digital broadcasting receiver 300 through a remote control device. Can be measured. Light passing or blocking adjustment of the shutter glasses 340 may be performed by a controller in the shutter glasses 340 according to a control command output from the digital broadcast receiver 300.

In addition, when measuring the visual acuity of the right eye, the visual inspection table is displayed as a two-dimensional image on the screen 520, and the left eye shutter liquid crystal panel 341 of the shutter glasses 340 blocks light, and the right eye shutter liquid crystal panel (343) allows light to pass through.

Measuring the visual acuity of the individual user may be performed by using the eye test table and the shutter glasses 340 displayed on the display unit 370 under the control of the controller 350 of the digital broadcast receiver 300. .

In step 420, the image quality settings optimized according to the visual acuity of each of the left and right eyes of an individual user can be obtained experimentally or in software, and vary greatly with different image quality settings according to the specifications or product model of the digital broadcasting receiver. Can be calculated. The optimized image quality setting value for each of the left and right eyes may be stored in the storage unit 380 in the form of a database and used in step 420. That is, when an individual user obtains or inputs vision information of each of the left eye and the right eye, the controller 350 reads the image quality setting value corresponding to the predetermined vision by using the database stored in the storage unit 380, and sets the read image quality. According to the value, the image quality setting value of each of the left and right images included in the 3D video signal to be displayed is adjusted.

The image quality setting value adjusting operation of step 420 may be automatically performed when the vision measurement in FIG. 5 is completed.

The database of the image quality setting values will be described in detail later with reference to FIG. 13.

In step 420, a plurality of three-dimensional images having different image quality settings are simultaneously or sequentially displayed (not shown). Among the displayed plurality of three-dimensional images, an image corresponding to each of the left and right eyesight of the individual user is displayed. Selecting (not shown), and applying the image quality setting value of the selected image to the left or right image included in the 3D video signal (step 420). The operation of the steps will be described in detail with reference to FIGS. 6 to 10 below.

FIG. 6 is a diagram for describing a step of sequentially displaying three-dimensional images having different image quality setting values.

7 is a diagram illustrating a screen configuration displayed in the image quality improving method according to an embodiment of the present invention.

FIG. 8 is a diagram for describing an operation of adjusting one image quality setting value in step 420 of FIG. 4.

9 is a view for explaining another image quality setting value adjusting operation in step 420 of FIG.

FIG. 10 is a diagram for describing another image quality setting value adjusting operation in step 420 of FIG. 4.

Referring to FIG. 6, in the step of simultaneously or sequentially displaying a plurality of three-dimensional images having different image quality setting values, the left eye visual acuity as described with reference to FIG. The left image 610 is displayed when selecting an image corresponding to, and the right image 620 is displayed when selecting an image corresponding to the right eye's vision. When the left image 610 is displayed, the left eye shutter liquid crystal panel 341 of the shutter glasses 340 passes through the light, and the right eye shutter liquid crystal panel 343 blocks the light. In addition, when displaying the right image 620, the left eye shutter liquid crystal panel 341 of the shutter glasses 340 blocks the light, and the right eye shutter liquid crystal panel 343 passes the light.

FIG. 6 illustrates an example in which a left image is displayed in an even field and a right image is displayed in an odd field according to the interlaced method described with reference to FIG.

In addition, prior to or simultaneously with the simultaneous or sequential display of a plurality of three-dimensional images having different image quality setting values, whether to set to an individual setting mode that adjusts the image quality setting value in consideration of the user's vision or the user's vision The method may further include outputting the OSD data 720 for selecting whether to set to a general setting mode that does not take into consideration.

Referring to FIG. 7, the OSD data 720 may be displayed on a predetermined area of the display screen 710 and may include a selection control key 730. The user or the like may operate the selection control key 730 of the OSD data 720 to select one of the individual setting mode and the general setting mode. The selected mode is input to the digital broadcast receiver 300 through the user interface 360.

Referring to FIG. 7B, when the individual setting mode is selected, adjustable image quality setting values (for example, color, brightness, sharpness, contrast, or saturation). outputting OSD data on the display screen 750 to select which image quality setting value to start adjusting. Referring to FIG. 7B, the OSD data 760 may list and include adjustable image quality setting values, and may select to adjust a predetermined image quality setting value using the selection cursor 770.

When a predetermined image quality adjustment value (for example, black level adjustment of brightness) is selected in the individual setting mode using the screen illustrated in FIG. 7B, a plurality of images having different image quality setting values mentioned above are selected. Displaying three three-dimensional images simultaneously or sequentially proceeds.

In addition, the step of outputting the aforementioned OSD data 720 and 760 may be provided before step 420 described with reference to FIG. 4. That is, when the individual setting mode is selected and the predetermined quality setting adjustment is continuously selected, step 420 is performed.

Referring to FIG. 8A, a plurality of three-dimensional images having different image quality setting values may be simultaneously displayed on a predetermined area of the display screen or as a whole of the display screen in a predetermined area 820 of the display screen 810. have. FIG. 8A illustrates an example in which a black level setting value is adjusted as the image quality setting value, and three-dimensional images 831, 833, which have three different blackness levels are illustrated. The case where 835 is simultaneously displayed on a predetermined area of the display screen is shown as an example.

If the image quality setting value of the left image according to the left eye of the individual user is first adjusted, the plurality of 3D images 831, 833, and 835 become left images. The selection cursor 830 is positioned on an image (eg, 831) corresponding to the left eye of the individual user among the plurality of three-dimensional images 831, 833, and 835, and the 831 image is operated by operating a selection key such as a remote controller. Select. Accordingly, among the plurality of displayed three-dimensional images 831, 833, and 835, an image corresponding to the left eye of the individual user, which is an image that the individual user can recognize as the highest quality screen, may be performed. Can be.

Here, the 3D image 831 in which the selection cursor 830 is positioned may be displayed on the full screen 825. The user may more easily select an image having an image quality setting value suitable for an individual user's vision by referring to the 3D image 831 displayed on the full screen 825.

Simultaneously or sequentially displaying a plurality of three-dimensional images having different image quality setting values as described above, selecting an image corresponding to each of the left and right eyesight of an individual user from among the plurality of displayed three-dimensional images The step (not shown), and the step of applying the image quality setting value of the selected image to the left or right image included in the 3D image signal may include a plurality of 3D images 831 and 833 displayed through the display unit 370. 835 selects an image as a remote controller (not shown), receives selection information through the user interface 360, and receives the input from the control unit 350 to receive a 3D image of the content to be displayed. This can be done by adjusting the image quality setting of the signal.

In addition, referring to FIG. 8B, three-dimensional images having different image quality setting values may be individually displayed on a predetermined area 860 of the display screen 850. In FIG. 8B, as shown in FIG. 8A, an example in which a black level value is adjusted among brightness is illustrated as an example.

Referring to FIG. 8B, a 3D image having a 'Low' setting value among black levels is displayed, and 3 having another setting value (for example, 'recommended' or 'High'). In order to select the dimensional image, the moving cursors 871 and 873 are manipulated to display a 3D image having different setting values, and then the corresponding 3D image may be selected using the selection cursor 870. In addition, the 3D images having different setting values may be automatically displayed at predetermined time intervals set by the digital broadcasting receiver 300 or set by the user. In addition, an accurate setting value of the black level of the 3D image being displayed on the screen may be separately displayed in the predetermined area 880.

Referring to FIG. 9, a case in which a color setting value is adjusted using an image quality setting value is illustrated. 9 illustrates an example in which three three-dimensional images 931, 933, and 935 having different color settings are displayed on a predetermined area 920 on the display screen 910. 940 may be moved to select a predetermined three-dimensional image. Since other configurations and operations are the same as those of FIGS. 8A and 8B, detailed descriptions thereof will be omitted.

Referring to FIG. 10, a case of adjusting a sharpness setting value with an image quality setting value is illustrated. FIG. 10 illustrates an example in which three three-dimensional images 1031, 1033, and 1035 having different sharpness settings are displayed on a predetermined area 1020 on the display screen 1010. The cursor 1040 may be moved to select a predetermined 3D image. Since other configurations and operations are the same as those of FIGS. 8A and 8B, detailed descriptions thereof will be omitted.

FIG. 11 is a diagram for describing an image quality setting value adjusting operation in step 420 of FIG. 4.

In step 420, outputting OSD (On Screen Display) data including an adjustment bar for switching a screen between a plurality of 3D images having different image quality setting values (not shown), and the plurality of 3D images. Selecting a 3D image corresponding to each of the left and right eyesight of the individual user (not shown), and setting the image quality setting value of the selected 3D image in the received 3D image signal; And applying to a right image (not shown).

Referring to FIG. 11, OSD data 1120 including an adjustment bar 1130 is displayed on the display screen 1110. The plurality of 3D images having different image quality setting values, which are switched between screens by the adjustment bar 1130, may be screens in which detailed image quality setting values are adjusted as shown in FIGS. The screens may be formed by combining all the set values and mapping the heights of the eyesight. FIG. 11 illustrates an example in which switching between screens formed by combining all the detailed image quality setting values and mapping the heights of eyesight is performed as an example. The combination of all of the detailed image quality setting values and the mapping of the visual acuity by height will be described in detail with reference to FIG. 13.

Referring to FIG. 11, a user or the like shifts the position of the adjustment bar 1130 to switch 3D images having different image quality setting values, and corresponds to each of the left and right eyesight of an individual user among the converted images. You can select a three-dimensional image.

FIG. 12 is a diagram for describing an operation of adjusting image quality setting values in step 420 of FIG. 4.

The method of improving the quality of a 3D image according to an embodiment of the present invention may further include a step (not shown) of receiving vision information of an individual user through a user interface.

Referring to FIG. 12, under the control of the controller 350, the OSD data 1220 for receiving vision information of an individual user is displayed in a predetermined area on the display screen 1210. The OSD data 1220 for inputting vision information may include a vision unit selection window 1230 and a vision input window 1240. The digital broadcast receiver 300 receives vision information of an individual user in response to the displayed OSD data 1220. The user may input whether the left eye is right or the right eye by manipulating the left and right selection keys 1250, and may input the detailed vision value into the input window 1260.

Then, in step 420, the quality setting value of each of the left and right images included in the received 3D image signal may be adjusted according to the received visual acuity information of the individual user.

In operation 430, the image quality setting adjusted in operation 420 is applied to the received 3D image signal and output. Operation 430 may be performed by the scaler 325 according to the controller of the controller 350. That is, the scaler 325 applies the adjusted image quality setting value to the 3D image signal to be displayed and outputs the same. In addition, operation 430 may be performed by the formatter 330.

The method for improving image quality of a 3D image according to an embodiment of the present invention may further include displaying a 3D image signal output in step 430 (not shown). The operation of the display step is performed by the display unit 370 under the control of the controller 350.

FIG. 13 is a diagram illustrating a method of improving image quality of a 3D image according to an embodiment of the present invention and a database of image quality setting values for each vision that can be used in the digital broadcast receiver.

Referring to FIG. 13, a method for improving image quality of a 3D image and a digital broadcast receiver according to an embodiment of the present invention combines all of the detailed image quality setting values and maps the visual quality setting values for each sight level The information 1300 may be stored and used in the storage unit 380 provided in the digital broadcast receiver 300.

Referring to FIG. 13, a database in which visual acuity is represented by glasses frequency values (1.0, 0.9, 0.8, etc.), and detailed values of image quality setting values are mapped for each visual acuity is illustrated. The database of FIG. 13 may experimentally obtain an optimized value by considering a model, a specification, etc. of a digital broadcasting receiver.

The image quality setting values for each visual acuity shown in FIG. 13 may be image quality setting values among a plurality of 3D images to be displayed in FIG. 11. In addition, as described with reference to FIG. 12, the stored database 1300 may be used to adjust the image quality setting value according to the visual acuity value input by the user.

On the other hand, the terms used in the present invention (terminology) are terms defined in consideration of functions in the present invention, which may vary according to the intention or custom of the skilled person in the relevant field, the definitions of which are used throughout the present invention. It should be based on.

The present invention is not limited to the above-described embodiments and may be variously modified and changed by those skilled in the art, which are included in the spirit and scope of the present invention as defined in the appended claims.

300: digital broadcast receiver
310: signal input and processing unit
311: tuner
313: demodulator
315: demultiplexer
320: decoder and scaler
321: video decoder
323: audio decoder
325: scaler
327 video processor
330: formatter
335: infrared output unit
340: shutter glasses
350: controller
355: OSD generator
360: user interface part
370: display unit
380: storage unit

Claims (19)

In the method of improving the image quality of the 3D image provided through the digital broadcast receiver,
Receiving a 3D video signal;
Adjusting an image quality setting value of each of the left and right images included in the 3D image signal according to an individual user's eyesight; And
And applying the adjusted image quality setting value to the 3D image signal and outputting the adjusted image quality setting value. The method of claim 1, wherein the adjusting of the image quality setting value to the visual acuity of the individual user is performed.
Adjusting at least one or more of color, brightness, sharpness, contrast, or chroma of each of the left and right images to the individual user's vision; The quality improvement method of the three-dimensional image, characterized in that. The method of claim 1,
And measuring the visual acuity of the individual user. The method of claim 3, wherein measuring the visual acuity of the individual user
Displaying an eye test table as a two-dimensional image; And
And measuring the visual acuity of the individual user by using the displayed visual acuity test table. The method of claim 4, wherein measuring the visual acuity of the individual user using the visual acuity chart
And measuring only the left eye of the individual user by opening only the left shutter of the shutter glasses, and measuring the right eye of the individual user by opening only the right shutter of the shutter glasses. Way. The method of claim 3, wherein the adjusting of the image quality setting value to the visual acuity of the individual user is performed.
And adjusting the image quality setting value of each of the left and right images automatically in accordance with the measured visual acuity of the individual user. The method of claim 1, wherein the adjusting to the vision of the individual user is performed.
Displaying a plurality of three-dimensional images having different image quality setting values simultaneously or at predetermined time intervals;
Selecting a 3D image corresponding to the left eye or right eye vision of the individual user from the plurality of 3D images; And
And applying the image quality setting value of the selected 3D image to the left or right image included in the received 3D image signal. The method of claim 1, wherein the adjusting to the vision of the individual user is performed.
Outputting OSD (On Screen Display) data including an adjustment bar for switching a screen between a plurality of 3D images having different image quality setting values;
Selecting a three-dimensional image among the plurality of three-dimensional images corresponding to the left or right eye vision of the individual user; And
And applying the image quality setting value of the selected 3D image to the left or right image included in the 3D image signal. The method of claim 1,
Receiving the vision information of the individual user through a user interface;
Adjusting according to the eyesight of the individual user
And adjusting the image quality setting value according to the received visual acuity information of the individual user. The method of claim 1,
And displaying the three-dimensional image signal to which the adjusted image quality setting value is applied, as a three-dimensional image. The method of claim 1,
And storing image quality setting values corresponding to the visual acuity information. A signal input unit for receiving a 3D image signal; And
A control unit for adjusting the image quality setting values of the left and right images included in the 3D image signal according to the visual acuity of the individual user, and controlling the image quality setting value to be applied to the received 3D image signal and outputting the adjusted image quality setting value. Digital broadcast receiver comprising a. The method of claim 12,
And a scaler configured to output the adjusted 3D image signal by applying the adjusted image quality setting value to the received 3D image signal in response to the control of the controller. The method of claim 12,
Further comprising a display unit for displaying the left image or the right image,
The control unit
And controlling the left or right shutters of the shutter glasses provided externally of the digital broadcast receiver to be selectively opened or closed in correspondence to the display of the left or right image. The method of claim 12, wherein the control unit
Adjusting image quality settings of at least one of color, brightness, sharpness, contrast, or chroma of each of the left and right images according to the visual acuity of the individual user. Featuring digital broadcast receivers. The method of claim 12, wherein the control unit
And measuring visual acuity of the individual user and automatically adjusting image quality setting values of each of the left and right images according to the measured visual acuity of the individual user. The method of claim 12, wherein the control unit
Control to display a plurality of three-dimensional images having different image quality setting values at the same time or at predetermined time intervals,
Among the plurality of 3D images, controlling the image quality setting value of the 3D image selected according to the left eye or right eye vision of the individual user to be applied to the left or right image included in the received 3D image signal. Digital broadcast receiver characterized. The method of claim 12, wherein the control unit
Controls to output OSD (On Screen Display) data including an adjustment bar for switching a screen between a plurality of 3D images having different image quality setting values,
Among the plurality of 3D images, controlling the image quality setting value of the 3D image selected according to the left eye or right eye vision of the individual user to be applied to the left or right image included in the received 3D image signal. Digital broadcast receiver characterized. The method of claim 12,
The apparatus may further include a storage configured to store image quality setting values corresponding to vision information.
The control unit
Receiving the visual acuity information of the individual user and reading a corresponding image quality setting value from the storage unit to control the read image quality setting value to be applied to the left and right images included in the received 3D image signal. Digital broadcast receiver characterized.

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