KR20090116989A - Method for encoding and decoding image, apparatus for displaying image and recording medium thereof - Google Patents

Abstract

PURPOSE: A method for encoding and decoding an image, an apparatus for displaying an image and a recording medium thereof are provided to use one tuner not several tuners according to a single bit stream and use a single decoder not several decoders, thereby simplifying system configuration. CONSTITUTION: A method for encoding an image comprises the following steps. A plurality of images are mapped on respective slice groups(S210). Encoding is performed according to a slice group(S220). At least one parameter set corresponding to a slice group is encoded. The parameter set comprises a sequence parameter set and a picture parameter set.

Description

Image encoding method, decoding method, video display device and recording medium therefor {Method for encoding and decoding image, apparatus for displaying image and recording medium}

The present invention relates to a video encoding method, a decoding method, a video display device and a recording medium thereof, and more particularly, to a video encoding method, a decoding method, and a recording medium for mapping and encoding a plurality of images to slice groups. It is about.

Technology development and discussion on Digital Cinema and Ultra-High Definition Television (UHDTV), which are digital imaging technologies that surpass the current 1920x1080, 2K-class High Definition broadcasting It is becoming. Digital cinema has a maximum image resolution of 4096x2096, 4K, and ultra-high definition TV has a resolution of up to 7680x4320, 8K at 4K resolution.

Since the ultra high resolution video contains more image information than the existing video, it is an important element to realize the realistic broadcasting that digital broadcasting ultimately seeks to make viewers feel more realistic.

Since such ultra-high resolution video has a throughput of 3 to 8 Gbps per second without data compression and 100 to 600 Mbps during compression, data compression is indispensable for processing, transmitting, and storing images.

With the recent development of communication technology, electronic products such as mobile phones, PDAs, digital TVs, and DMBs have been developed. Data used in such electronic products include audio, still images, video, etc. Among them, the amount of data of the video is very large as described above.

Therefore, video compression standards have been developed to reduce the size of data, starting with H.261, VC-1, the standard of the Society of Motion Picture and Television Engineers (SMPTE), and ITU-T and ISO / IEC. Much progress has been made to H.264 / AVC.

1 is a diagram illustrating a conventional multiple image receiving and decoding system.

FIG. 1A transmits two video signals to different frequency bands, receives them separately from the tuners 101 and 102, and decodes each bitstream from each decoder 105 and 106 before displaying them on the video signal processor 110. Here is an example of doing the necessary processing for the display:

FIG. 1B illustrates that after the image signal having a single modulation frequency is received by the tuner unit 103, the demultiplexer 104 demultiplexes the corresponding bitstream and transmits the respective bitstreams to the respective decoders 105 and 106 to decode the image. As shown in FIG. 1A, a system for sending a reconstructed image signal to the image signal processor 110 and processing the same is illustrated.

In the related art, as illustrated in FIG. 1A, a plurality of tuners have to be provided in order to transmit multiple image contents having independent contents through a plurality of channels. In addition, as shown in Figure 1b, when transmitting through a single frequency without using a plurality of tuners, after receiving the multiplexed independent bitstreams and extracting the individual bitstreams output by demultiplexing, it is necessary to restore through each decoder. In addition, a plurality of decoders must be provided, and additionally, information on a relationship between the plurality of images is transmitted or difficult to estimate.

An object of the present invention is to provide a video encoding method, a decoding method, a video display device, and a recording medium thereof, in which a single bitstream is formed, which enables efficient encoding and decoding.

According to an embodiment of the present invention, an image encoding method includes mapping a plurality of images to slice groups and encoding each slice group.

According to an aspect of the present invention, there is provided a method of extracting a plurality of encoded slice groups from an input bitstream, decoding the extracted slice groups, and mapping the slice groups. Extracting the image.

An image display apparatus according to an embodiment of the present invention for achieving the above object, the display unit for displaying a predetermined image, and extract a plurality of slice groups from a single bit stream input, decoding operation for each extracted slice group And a decoder to extract an image mapped to each slice group, and an image signal processor to synthesize the extracted plurality of images into a single image.

On the other hand, the recording medium according to the embodiment of the present invention is a recording medium that can be read by a processor that records a program for executing the above-described video encoding method on the processor.

On the other hand, a recording medium according to an embodiment of the present invention is a recording medium that can be read by a processor that records a program for executing the above-described image decoding method on a processor.

According to the present invention, since encoding and decoding are performed by mapping a plurality of images to slice groups, a single bitstream is formed and efficient encoding and decoding are possible. In addition, it is possible to use one tuner instead of a plurality of tuners according to a single bitstream, and also to use a single decoder instead of a plurality of decoders, thereby simplifying the system configuration.

This method can minimize the modification of an already configured system through the addition or correction of syntax from an image standard point of view, and has the advantage of supporting the use of information on surrounding divided images within the image compression standard.

In addition, the video display device can increase the user convenience by assigning a number corresponding to a plurality of videos to display the video. In addition, an unselected, i.e., non-displayed, image among the plurality of images does not need to be decoded by the decoder, thereby reducing power consumption.

Hereinafter, with reference to the accompanying drawings looks at a preferred embodiment according to the present invention.

2 is a flowchart illustrating an image encoding method according to an embodiment of the present invention, FIG. 3 is a diagram for explaining the image encoding method of FIG. 2, FIG. 4 is a diagram illustrating an example of a slice group, and FIG. 5 is FIG. 11 is a diagram illustrating syntax for position information of a slice group in a type 2 among slice groups. FIG.

Referring to the drawings, a plurality of images are mapped to slice groups, respectively (S210).

Here, the plurality of images may be separate content images related to movies, dramas, sports, shopping, and the like, as shown in FIG. 3A. That is, the plurality of images may be independent images. Meanwhile, the plurality of images may be images of different views as shown in FIG. 3B.

Meanwhile, in FIG. 3A and FIG. 3B, a plurality of images are divided into four high resolution images (high resolution images 0 to 3 and 310), but the number is not limited thereto and various embodiments are possible.

Hereinafter, the slice group will be described with reference to FIG. 4.

H.264 / AVC, an image compression standard, introduced the concept of a slice group that can include a plurality of slices. That is, one sequence may be divided into a plurality of pictures, and each individual picture may be composed of a plurality of slice groups.

4 shows an example of a slice group in H.264 / AVC. Type 0 is interleaved, type 1 is dispersed, type 2 is foreground / leftover, type 3 is box-out, type 4 is raster, Type 5 represents the wipe type. On the other hand, although not shown in the figure, type 6 (type 6) represents an explicit format for representing an arbitrary constituent slice by sending a map of slice groups to a decoder.

In H.264 / AVC, a slice group was originally proposed as an error reconstruction method for reconstructing an image when an error occurs due to transmission of an image or other causes. Used as a unit to process by mapping to.

FIG. 3 may be referred to as mapping a plurality of images to a slice group using type 2 of the slice types shown in FIG. 4. In other words, the high resolution images (high resolution images 0 to 3) are mapped to slice groups (slice groups 0 to 3), respectively.

Accordingly, "top_left" of FIG. 5, which is a syntax element of type 2 (type 2) among slice types, indicates left and top position information of each slice group, and "bottom_right" represents right and bottom positions of each slice group. Represent information. Such "top_left" corresponds to MBA0T, MBA1T, MBA2T, and MBA3T of each slice group of FIG. 3, and "bottom_right" corresponds to MBA0B, MBA1B, MBA2B, and MBA3B of each slice group of FIG.

Next, each slice group is encoded (S220).

Encoding per slice group includes frequency transform for frequency transforming an image signal, quantization for quantizing the transformed signal, entropy encoding and deblocking filtering of the quantized signal, and the like. Of course, it may also include motion estimation and compensation according to the motion vector. Here, frequency conversion and quantization may be performed through one process.

As a result, by mapping a plurality of images to slice groups, each of the plurality of images may be encoded into a single bitstream simply by using an existing syntax element without a separate syntax element.

Conventionally, a plurality of tuners or a demultiplexer are required as in FIG. 1A. However, in the present invention, since a single bitstream is formed, there is no need for multiplexing and a plurality of processors are not required.

Meanwhile, a single bitstream in which a plurality of high resolution images 310 and 315 are encoded for each slice group may constitute an ultra high resolution image 320 or 325 as shown in FIG. 3. The ultra high resolution images 320 and 325 may have a resolution of 4K of 4096x2096 to 8K of 7680x4320. The ultra high resolution images 320 and 325 may be extracted and displayed for each of the high resolution images 310 and 315.

Meanwhile, in the encoding for each slice group (S220), at least one parameter set corresponding to the slice group may be further encoded.

Referring to FIG. 3A, the high resolution images 310 constituting the ultra high resolution image 320 are different kinds of contents. In order to generate different types of content into a single bitstream, the high resolution images 310 are converted into a raw format instead of a compressed state, and then the high resolution images 310 are synthesized into an ultra high resolution image and all the images are identical. You must encode to have a parameter set. Here, the parameter set may include a sequence parameter set (SPS) and a picture parameter set (PPS).

However, this method does not properly reflect the characteristics of each component image, and if each of the high resolution images 310 is compressed, it is necessary to decode the encoded image to have the same parameter set after restoring the image. There is a hassle.

Accordingly, in the present invention, when the high resolution images 310 mapped to one slice group are independent bitstreams encoded individually as shown in FIG. 3A, each slice group shares a parameter set with another slice group or a different parameter set. For reference. In other words, the minimum number of parameter sets used to decode one picture of one super high resolution image is available from one to the maximum number of slice groups constituting the image.

The correspondence between the parameter set and the slice group will be described later with reference to FIGS. 6 to 8.

6 is a view showing an example of the correspondence between the slice group and the parameter set in the context of the present invention.

Referring to the drawings, each parameter set may correspond to each slice group.

For example, as illustrated in FIG. 3A, independent images 310 having different contents may have parameter sets corresponding to configuration images according to characteristics of each image, a provider of the image, and a contents provider. . Therefore, as shown in FIG. 6, slice groups corresponding to the configuration images may refer to individual parameter sets.

Meanwhile, although FIG. 6 illustrates a case where each component image is composed of different contents and has different parameter sets, the number of parameter sets constituting the ultra-high resolution image 320 may vary according to the characteristics of the image and the parameter set.

On the other hand, each parameter set must be transmitted before being used in the slice group. In addition, although the order of the slice groups is arranged in order from 1 to 4 in FIG. 6, the order of transmission of the parameter sets need not be performed in order and only needs to be transmitted and decoded before use.

The slice groups constituting the ultra-high resolution image point to an ID of a picture parameter set (PPS) that they refer to in each header, such as H.264 / AVC. ) Can also specify a sequence parameter set (SPS).

6, slice group # 1 points to PPS # 1 and PPS # 1 points to SPS # 1, so that slice group # 1 can refer to both SPS # 1 and PPS # 1. Of course, it is also possible that the slice group # 1 simultaneously points to the PPS # 1 and the SPS # 1.

On the other hand, as shown in Fig. 6, in the case of referring to the independent individual parameter sets (SPS # 1 to SP # 4, PPS # 1 to PPS # 4) for each slice group, it is added to configure the whole slice group, that is, the entire image. Information is required. This is called a synthesis parameter set in the present invention, which will be described with reference to FIG. 7.

7 is a view showing another example of the correspondence relationship between a slice group and a parameter set according to the present invention.

Referring to the drawings, FIG. 7 is similar to FIG. 6 in that each slice group corresponds to an individual parameter set (SPS # 1 to SPS # 4 and PPS # 1 to PPS # 4). However, the entire image, That is, the difference is that it further includes an additional parameter set for configuring the entire slice group. That is, in FIG. 7, SPS # 0 and PPS # 0 are further added as a synthesis parameter set for controlling the entire image, that is, the ultra high resolution image.

Slice groups mapped to each high resolution image may refer to individual sequence parameter sets SPS # 1 to SPS # 4 corresponding to individual picture parameter sets PPS # 1 to PPS # 4 corresponding to decoding images. Since the individual sequence parameter sets (SPS # 1 to SPS # 4) corresponding to the individual picture parameter sets (PPS # 1 to PPS # 4) referred to by each slice group are only for the slice group, the slice groups are synthesized. Therefore, there is insufficient information to construct an ultra high resolution image. Therefore, in the synthesis parameter sets SPS # 0 and PPS # 0, information for controlling the super high resolution image is included and is not referred to by the slice group.

On the other hand, the synthesis sequence parameter set (SPS # 0) of the synthesis parameter set may include a variety of information, among which the size of the super-resolution image coded, for example, the number of macro blocks in the horizontal direction and the number of macro blocks in the vertical direction It may include information indicating.

Information indicating the number of macroblocks in the horizontal direction may be referred to as "pic_width_in_mbs_minus1", and information indicating the number of macroblocks in the vertical direction may be referred to as "pic_height_in_map_units_minus1".

For example, if the ultra high resolution image is a progressive encoded image with a resolution of 3840x2176, and the size of the macro block is 16X16, "pic_width_in_mbs_minus1" and "pic_height_in_map_units_minus1" in the synthesis sequence parameter set (SPS # 0) are May have 239 and 135, respectively.

On the other hand, if the ultra-high resolution image is divided into high-resolution images of the same size in the horizontal and vertical directions, and the angles are mapped to the slice groups, as shown in FIG. "pic_height_in_map_units_minus1" has values of 59 and 33, respectively.

That is, the sum of "pic_width_in_mbs_minus1" + 1 in each individual sequence parameter set (SPS # 1-SPS # 4) of the high resolution image is equal to "pic_width_in_mbs_minus1" +1 of the super high resolution image in the composite sequence parameter set (SPS # 0). The sum of "pic_height_in_map_units_minus1" + 1 in each individual sequence parameter set (SPS # 1 to SP # 4) of the high resolution image is equal to "pic_height_in_map_units_minus1" +1 of the super high resolution image in the composite sequence parameter set (SPS # 0). Becomes the same.

That is, the synthesis sequence parameter set SPS # 0 may include information necessary for controlling the ultra high resolution image, for example, information about the size of the image in the horizontal and vertical directions. Accordingly, it is possible to know how many slice groups the corresponding super resolution image is composed of.

Meanwhile, in FIG. 7, each partial picture is individually referred to from an individual picture parameter set (PPS # 1 to PPS # 4), but other parameter information of the synthesized picture parameter set (PPS # 0) is used for each individual picture parameter set. Not used in conjunction with (PPS # 1 ~ PPS # 4). This is because the slice group information among the information in each individual picture parameter set (PPS # 1 to PPS # 4) is already divided into slice groups in the synthesized picture parameter set (PPS # 0).

On the other hand, as shown in FIG. 3A, since a plurality of images, that is, high resolution images, are independent entities, coordinate information and motion vectors of macroblocks encoded therein are also information of high resolution images, not an ultra high resolution region.

Therefore, when reconstructing an ultra-high resolution image composed of independent images, the partial images refer to the composite parameter sets (SPS # 0, PPS # 0) of the ultra-high resolution image or individual parameter sets (SPS # 1 to SPS # 4, It is desirable to examine whether the PPS # 1 to PPS # 4) are referred to, and to manage or integrate the parameter information and the reference pictures for decoding.

On the other hand, the relationship between the slice group and the parameter set of FIG. 6 or 7 described above, as well as the video content of the independent content as shown in FIG. 3A, as well as the synchronization between the respective partial images as shown in FIG. It is also possible to apply the case of an encoded multiview image. That is, separate parameter sets may be used for a plurality of slice groups.

8 is a view showing another example of the correspondence relationship between a slice group and a parameter set according to the present invention.

Referring to the drawings, a difference is shown in FIG. 7 in that a parameter set corresponds to each slice group in common. That is, the slice groups all correspond to the common picture parameter set PPS # 1, and the common picture parameter set PPS # 1 corresponds to the common slice picture parameter SPS # 1.

As shown in FIG. 3, if a super high resolution image is composed of a plurality of images but is compressed by being synthesized at an ultra high resolution in an uncompressed raw image stage, as shown in the drawing, a single reference parameter (SPS # 1, PPS # 1) is shown. It is preferable to have. In this case, since the position of the super resolution image can be known from the entire image through the start and end addresses of the macroblocks of each slice group, the configuration of the super resolution image shown in FIG. The synthesis parameter sets SPS # 0 and PPS # 0 are not needed separately.

FIG. 9 is a diagram illustrating an example of arrangement of partial images constituting an ultra high resolution image according to the present invention. FIG.

Referring to the drawings, MBH and MBV indicate the number of macro blocks in the horizontal and vertical directions for each image. In particular, MBH0 represents the number of macro blocks in the horizontal direction of the super high resolution image, and MBV0 represents the number of macro blocks in the vertical direction of the ultra high resolution image.

The ultra high resolution image may include a plurality of partial images. In the drawing, eight partial images are included from partial image 0 to partial image 7. FIG. As described above, the partial images 0 to 7 are sequentially mapped to each slice group.

For display of the ultra high resolution image, it is preferable to arrange each partial image from left to right and from top to bottom according to the number of slice groups. In addition, it is preferable to arrange each partial image so that the sum of the number of macroblocks in the horizontal direction of each slice group is equal to the number of macroblocks of the super high resolution image. In addition, it is preferable to arrange each partial image so that the sum of the number of macroblocks in the horizontal direction of each slice group is equal to the number of macroblocks of the super high resolution image.

As described in FIG. 7, each slice group refers to an individual parameter set, and since there is a parameter set for representing the entire super resolution image, the partial image 0 is decoded and placed on the leftmost side of the super resolution image. .

Next, the sum of MBH2 and MBH1 in the horizontal direction of partial image 1 is examined and compared with MBH0. Since the sum of MBH2 and MBH1 is equal to MBH0, the partial image 1 is positioned in the horizontal direction of the partial image 0. FIG.

Next, the partial image 2, in which the number of macroblocks in the horizontal direction is the same as the MBH2, is placed at the bottom of the partial image 1. FIG. That is, since the number of macro blocks MBV2 in the vertical direction of the partial image 1 is smaller than the number of macro blocks in the vertical direction of the partial image 0 MBV1, the partial image 2 is positioned directly below the partial image 1.

Next, similarly, the partial image 3 is located at the bottom of the partial image 2. In this case, since the sum of the number of macro blocks in the vertical direction of the partial images 1 to 3 (MBV2 + MBV3 + MBV4) is equal to the number of the macro blocks in the vertical direction of the partial image 0 (MBV1), subsequent partial images 4 to 7 are partial. It is assumed to be located at the bottom of the video 0 and the partial video 3.

10 is a diagram illustrating syntax for determining a parameter set.

Referring to the drawings, whether a parameter set for an ultra-high resolution image or a parameter set for an individual image can be known by encoding information indicating this. This information may be named "reserved_zero_4bits". This " reserved_zero_4bits " is a value not used in H.264 / AVC. By decoding the promised value using this, it can be seen that the corresponding sequence parameter set (SPS) is not a parameter set referenced for the partial picture. Accordingly, it may be inferred that the picture parameter set (PPS) referring to the divided sequence parameter set (SPS) is also a parameter set used for constructing an ultra-high resolution image.

Meanwhile, another method may be inferred from values of parameters indicating whether a corresponding parameter set ID is referenced and the size of an image, as described with reference to FIG. 9.

11 is a flowchart illustrating an image decoding method according to an embodiment of the present invention.

Referring to the drawings, first, a plurality of encoded slice groups are extracted from an input bitstream (S1110). The input bitstream may be a single bitstream encoded by the method of FIG. 2 described above. A single bitstream may include a plurality of decoded slice groups, which are extracted for each slice group.

As described with reference to FIGS. 6 to 8, the extraction operation of the plurality of slice groups includes a parameter set corresponding to the slice group (SPS # 0 to SPS4, PPS # 0 to PPS # 4), and the parameter set of the whole slice group. It may be performed using "reserved_zero_4bits" of FIG. 9 of FIG. 10, which is information indicating whether a parameter set is for a parameter set or a parameter set for an individual slice group. To this end, the decoder 1220 preferably decodes the parameters (SPS # 0 to SPS # 4 and PPS # 0 to PPS # 4) and "reserved_zero_4bits" included in the bitstream before the slice group.

Next, the extracted slice group is decoded (S1120).

The decoding operations for each slice group include entropy decoding, inverse quantization, inverse transform and deblocking filtering, motion compensation, and the like, as well as decoding "top_left" and "bottom_right" of FIG. 5 which are position information indicating the position of the slice group. It may include. Meanwhile, inverse quantization and inverse transformation may be performed through one process.

Next, the divided image mapped to the slice group is extracted (S1130). The split image may be extracted by MBA0T, MBA1T, MBA2T, MBA3T, MBA0B, MBA1B, MBA2B, and MBA3B of each slice group of FIG. 3 with reference to the decoded "top_left", "bottom_right", and the like.

Next, although not shown in the figure, the extracted image may be synthesized into a single image. The extracted image may be an independent image having different contents (FIG. 3A) or an image having different views of the same image (FIG. 3B). The extracted plurality of images may be synthesized into a single image. In addition, a video number of each of the plurality of images may be added to a single image including the plurality of images. This will be described later with reference to FIG. 13.

12 is a block diagram schematically illustrating an image display device according to an exemplary embodiment of the present invention, and FIG. 13 is a view referred to in the description of FIG. 12.

Referring to the drawings, the video display device 1200 of FIG. 12 includes a tuner 1210, a decoder 1220, an image signal processor 1230, and a display 1240.

Tuner 1210 receives the bitstream. This bitstream may be a bitstream generated by the video encoding method of FIG. 2. That is, the plurality of images may be a single bitstream mapped to slice groups and encoded.

The decoder 1220 receives a single bitstream received from the tuner 1210, extracts a plurality of slice groups from the single bitstream, performs a decoding operation for each extracted slice group, and maps each slice group. Extracted image.

As described with reference to FIGS. 6 to 8, the extraction operation of the plurality of slice groups includes a parameter set (SPS # 0 to SPS # 4, PPS # 0 to PPS # 4) corresponding to the slice group, and the parameter set being a slice group. It may be performed using "reserved_zero_4bits" of FIG. 9 of FIG. 10 that is information indicating whether the parameter set is for the whole or for each individual slice group. To this end, the decoder 1220 preferably decodes the parameters (SPS # 0 to SPS # 4 and PPS # 0 to PPS # 4) and "reserved_zero_4bits" included in the bitstream before the slice group.

The decoding operations for each slice group include entropy decoding, inverse quantization, inverse transform and deblocking filtering, motion compensation, and the like, as well as decoding "top_left" and "bottom_right" of FIG. 5 which are position information indicating the position of the slice group. It may include. Meanwhile, inverse quantization and inverse transformation may be performed through one process.

Extraction of the divided image mapped to the slice group is performed by MBA0T, MBA1T, MBA2T, MBA3T, MBA0B, MBA1B, MBA2B, and MBA3B of each slice group of FIG. 3 with reference to the decoded "top_left", "bottom_right", and the like. can do.

For example, referring to the operation of the decoder 1220, first, a sequence parameter set (SPS) and a picture parameter set (PPS) of a single bitstream are received. When "reserved_zero_4bits" of FIG. 10 is not used, the values of "pic_width_in_mbs_minus1" and "pic_height_in_map_units_minus1" in the sequence parameter set (SPS) are compared with those of other parameter sets, so that they are for a super resolution image and for a partial image. Distinguish In the case of using "reserved_zero_4bit", a codeword of a predetermined "reserved_zero_4bit" is interpreted to discriminate whether the parameter set is for an ultra high resolution image or a partial image.

If the partial images refer to an individual parameter set, decoding is performed using the individual parameter set, and finally, when the output of the ultra high resolution image is performed, the partial images are combined using the information of the composite parameter set for the ultra high resolution image. Display on. If a plurality of partial images does not refer to an individual parameter set but only a synthesis parameter set, the partial images may be combined and displayed on the screen by using the position information of the slice group in the picture parameter.

Meanwhile, the decoder 1220 may decode the input image encoded in various methods other than the H.264 / AVC encoding method. For example, it is possible to decode an input image encoded by various coding schemes, such as the MPEG series coding scheme established by a moving picture experts group (MPEG) and the VC-1 established by the Society of Motion Picture and Television Engineers (SMPTE).

The image signal processor 1230 performs various signal processing so that the input image is displayed on the display unit. In particular, the extracted plurality of images received from the decoder 1220 may be synthesized into a single image.

To this end, the image signal processor 1230 may include a scaler (not shown), an OSD unit (not shown), a memory (not shown), an image transmitter (not shown), and a controller (not shown).

A scaler (not shown) adjusts the size of the decoded image to correspond to the screen of the display unit, and the OSD unit (not shown) displays arbitrary graphics, text information, menus, etc. on the screen of the display unit 1240. The display unit controls the display, and the memory (not shown) may store the reference picture in the decoding process of the decoder 1220, or store arbitrary graphic or character information for display on the screen of the display unit 1240, and transmit the image. The unit (not shown) processes any graphic or character information stored in the memory (not shown), and transmits the image to which the processed graphic or character information is added to the display unit, and the controller (not shown) may include an image signal processor (not shown). The overall operation in 1230 may be controlled, and the operation of the decoder 1220 may also be controlled.

The image passing through the image signal processor 1230 is displayed through the display unit 1240. The image may be a single ultra high resolution image composed of a plurality of images, that is, a single ultra high resolution image composed of a plurality of independent images as shown in FIG. 3A.

Meanwhile, instead of displaying all of the plurality of partial images constituting the ultra-high resolution image as shown in FIG. 12, only some partial images may be displayed as shown in FIG. 13.

To this end, a number of a slice group or an image number for distinguishing each image may be displayed on each of the plurality of partial images in the super high resolution image. The display of the image number 1310 may be performed through an OSD unit (not shown) in the image signal processor 1230 of FIG. 12.

When any one of the plurality of images is selected with reference to the image number 1310, the image processor 1230 controls the selected image to be displayed through the display unit 1240.

In FIG. 13, when only one of the four images is selected, the corresponding image is displayed to fit the ultra-high resolution image display unit 1240. However, the number of images that can be displayed on the display unit 1240 and the resolution to be displayed are shown. It is not limited to the examples presented.

Meanwhile, the slice group corresponding to the unselected images among the plurality of images may not be decoded by the decoder 1220. To this end, the image processor 1230 may transmit a control signal for controlling to selectively decode the decoder 1220. This has the advantage of reducing power consumption by eliminating unnecessary decoding processes.

14 is a block diagram schematically illustrating a video display device according to an embodiment of the present invention.

Referring to the drawings, the image display device 1400 of FIG. 14 is substantially similar to the image display device 1200 of FIG. 12, but the plurality of display units display images processed to be reproduced by the video signal processor 1430. The difference is that each is displayed through (1440-1 to 1440-4).

In this case, the entire super high resolution image may be initially displayed, and only the desired image may be displayed on the display unit by the user's selection. As in the above example, a part or all of the super high resolution image may be displayed on the display unit.

Meanwhile, the connection between the image signal processing units 1230 and 1430 and the display units 1240, 1440-1 to 1440-4 of FIGS. 12 and 14 may use a wired or wireless interface. In addition, it is possible to configure an on-demand multiple video system by user's order using a single ultra-resolution video bitstream. It is possible to further utilize the function of a set-top box as a home media server by ordering a plurality of high resolution images without configuring a plurality of tuners or decoders.

 Meanwhile, the video encoding method or the decoding method of the present invention may be implemented as code that can be read by a processor in a processor-readable recording medium included in the video encoding device or the picture decoding device, respectively. The processor-readable recording medium includes all kinds of recording devices that store data that can be read by the processor. Examples of the processor-readable recording medium include ROM, RAM, CD-ROM, magnetic tape, floppy disk, optical data storage device, and the like, and also include a carrier wave such as transmission through the Internet. The processor-readable recording medium can also be distributed over network coupled computer systems so that the processor-readable code is stored and executed in a distributed fashion.

In addition, although the preferred embodiment of the present invention has been shown and described above, the present invention is not limited to the specific embodiments described above, but the technical field to which the invention belongs without departing from the spirit of the invention claimed in the claims. Of course, various modifications can be made by those skilled in the art, and these modifications should not be individually understood from the technical spirit or the prospect of the present invention.

1 is a diagram illustrating a conventional multiple image receiving and decoding system.

2 is a flowchart illustrating an image encoding method according to an embodiment of the present invention.

FIG. 3 is a diagram for describing an image encoding method of FIG. 2.

4 is a diagram illustrating an example of a slice group.

FIG. 5 is a diagram illustrating syntax for location information of a slice group in a type 2 among slice groups. FIG.

FIG. 6 is a diagram illustrating an example of a correspondence relationship between a slice group and a parameter set according to the present invention. FIG.

7 is a view showing another example of the correspondence relationship between a slice group and a parameter set according to the present invention.

8 is a view showing another example of the correspondence relationship between a slice group and a parameter set according to the present invention.

FIG. 9 is a diagram illustrating an example of arrangement of partial images constituting an ultra high resolution image according to the present invention. FIG.

10 is a diagram illustrating syntax for determining a parameter set.

11 is a flowchart illustrating an image decoding method according to an embodiment of the present invention.

12 is a block diagram schematically illustrating a video display device according to an embodiment of the present invention.

13 is a diagram referred to the description of FIG. 12.

14 is a block diagram schematically illustrating a video display device according to an embodiment of the present invention.

Claims (30)

Mapping a plurality of images to slice groups, respectively; And And encoding the respective slice groups. The method of claim 1, In the encoding step, at least one parameter set corresponding to the slice group is encoded. The method of claim 2, And encoding an individual parameter set corresponding to each of the slice groups. The method of claim 3, And encoding a synthesis parameter set including information about the entire slice group. The method of claim 4, wherein And the information includes information indicating the number of macroblocks in the horizontal and vertical directions of the entire slice group. The method of claim 2, And encoding a common parameter set corresponding to each of the slice groups in common. The method of claim 2, And the parameter set comprises a sequence parameter set and a picture parameter set. The method of claim 7, wherein And the picture parameter set is encoded corresponding to the slice group, and the sequence parameter set is encoded corresponding to the picture parameter. The method of claim 2, The encoding step, And encoding information indicating whether the parameter set is a parameter set for an entire slice group or a parameter set for an individual slice group. The method of claim 2, The encoding step, And encoding the position information indicating the boundary of each slice group. The method of claim 10, The location information, Upper left position information indicating left and top boundaries of each slice group; And And right bottom position information indicating right and bottom boundaries of each slice group. The method of claim 1, And the plurality of images are independent images or images of different views. Extracting a plurality of encoded slice groups from an input bitstream; Decoding the extracted slice group; And Extracting an image mapped to the slice group. The method of claim 13, In the decoding, the at least one parameter set corresponding to the slice group is decoded. The method of claim 14, And decoding an individual parameter set corresponding to each of the slice groups. The method of claim 15, And decoding a synthesis parameter set including information about the entire slice group. The method of claim 16, And the information includes information indicating the number of macro blocks in the horizontal and vertical directions of the entire slice group. The method of claim 14, And decoding a common parameter set commonly corresponding to each of the slice groups. The method of claim 14, And the parameter set comprises a sequence parameter set and a picture parameter set. The method of claim 19, And the picture parameter set is decoded corresponding to the slice group, and the sequence parameter set is decoded corresponding to the picture parameter. The method of claim 14, The decoding step, And decoding information indicating whether the parameter set is a parameter set for an entire slice group or a parameter set for an individual slice group. The method of claim 14, The decoding step, And decoding the position information indicating the boundary of each slice group. The method of claim 22, The location information, Upper left position information indicating left and top boundaries of each slice group; And And right bottom position information indicating right and bottom boundaries of each slice group. A display unit which displays a predetermined image; A decoder for extracting a plurality of slice groups from a single input bit stream, performing a decoding operation for each extracted slice group, and extracting an image mapped to each slice group; And And an image signal processor for synthesizing the extracted plurality of images into a single image. The method of claim 24, And the image signal processor controls to display image numbers corresponding to the plurality of images in the single image. The method of claim 24, And when one of the plurality of images is selected, the image processor controls the selected image to be displayed on the display unit. The method of claim 26, And the image signal processor controls only the slice group corresponding to the selected image to be decoded by the decoder. The method of claim 24, Each of the plurality of images is displayed on a plurality of display units, respectively. A processor-readable recording medium having recorded thereon a program for executing the image encoding method of claim 1. A processor-readable recording medium having recorded thereon a program for executing the method of any one of claims 13 to 24 on a processor.

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