CN110858902A - Synchronization method of decoded tile and display position based on input geographic location and related video decoding device - Google Patents

Abstract

A method for synchronizing a decoding block with a display position is used in a video bitstream decoding device. The method comprises determining an interest region of an original image of an input bitstream according to a geographical location to extract interest block data of the interest region, wherein the interest region corresponds to an interest image; reconstructing the input bitstream according to the interest block data to generate a reconstructed bitstream; decoding the reconstructed bitstream to generate a reconstructed decoded image; and converting the reconstructed decoded image into the interest image according to the interest block data.

Description

Synchronization method of decoded tile and display position based on input geographic location and related view frequency decoding device

technical field

The present invention relates to a method for synchronizing a decoded image block with a display position and a related video decoding device, and more particularly to a method for synchronizing a decoded image block and a display position based on an input geographic location, and a related video decoding device.

Background technique

In a 360-Degree Virtual Reality (VR360 for short) application, when using the world map mode, the video decoding device (for example, a virtual reality device) will follow the geographic location (for example, longitude, latitude and correspondence) selected by the user. Viewing angle) to determine the display content of its screen. Generally speaking, virtual reality devices can download image files (eg, video bit-streams) from a world map database through a network, and temporarily store the image files in a built-in memory (eg, frame buffers) )), and then decode the image file to obtain the image to be displayed, so as to display it on the screen.

FIG. 1 is a schematic diagram of loading a field of view FOV1 from a world map E_MAP according to a geographic location L1. FIG. 2 is a schematic diagram of loading a field of view FOV2 from the world map E_MAP according to a geographic location L2. As shown in Figures 1 and 2, the world map E_MAP can be divided into a plurality of tile numbers 0 to 509 according to a plurality of longitudes and latitudes (for example, 30 longitude*17 latitude=510 tiles). Since the world map E_MAP is a flat map converted from the surface of a sphere, the size or shape of the partition image to be displayed will vary with different latitude and longitude.

For example, in FIG. 1 , when the geographic location L1 is at 0 degrees latitude (equator), the field of view FOV1 includes tile numbers 98-111, 128-141, 158-171, 188-201, 218～231, 248～261, 278～291, 308～321, 338～351, 368～381, 398～411, a total of 154 tiles; the content displayed on the screen is a Region of Interest ROI1, The region ROI1 contains 80 tiles with tile numbers 132-137, 160-169, 189-200, 219-230, 249-260, 279-290, 309-320, 340-349, 372-307 in total.

In FIG. 2, when the geographic location L2 is at 56 degrees latitude, the field of view FOV2 includes tile numbers 0-29, 30-59, 60-171, 90-201, 120-231, 150-261, 180-291 , 210~321, 240~351, 270~381, a total of 300 tiles; the display content of the screen is an area of interest ROI2, and the area of interest ROI2 includes tile numbers 0~29, 36~53, 67~82, 97 ～112, 127～142, 157～172, 188～201, 219～230, 250～252, 257～259, a total of 144 tiles.

Comparing Figures 1 and 2, it can be found that the lengths and widths of the view areas FOV1 and FOV2 are different, so the memory sizes (eg, the size of the frame buffer) required to perform partition image decoding are also different.

Currently, the panoramic virtual reality technology adopts the High Efficiency Video Coding (HEVC) standard for image encoding and decoding. However, the current hardware design can support a maximum pixel width of 4096 and a maximum pixel height of 2560. Since the pixel width 7860 of the field of view FOV2 exceeds the maximum pixel width of 4096, the existing HEVC hardware design cannot support the image decoding work of the field of view FOV2, resulting in the virtual reality device being unable to display normally.

In addition, the HEVC standard defines a motion-constrained tile set (MCTS for short), which allows tiles in the MCTS to be decoded independently without reference to other data. However, the applicant has noticed that during MCTS decoding, if the user moves the viewing angle from the geographic location L1 to the geographic location L2, the existing video decoding device does not synchronously change the target tiles to be decoded (because the tiles in the MCTS can be independent decoding without reference to other data), so that the video decoding device maps the decoded image of the region of interest ROI1 to the display position of the region of interest ROI2, resulting in the virtual reality device displaying an incorrect image.

In view of this, it is an important issue in the art how to solve the problem of reconstructing the image block and synchronizing the decoding image block with the display position so as to ensure the normal display of the virtual reality device.

SUMMARY OF THE INVENTION

Therefore, the main purpose of the present invention is to provide a method for synchronizing a decoded image block with a display position and a related video decoding device, so as to ensure that the virtual reality device can display normally.

The invention discloses a decoding picture block and display position synchronization method for a video decoding device. The method includes determining a region of interest of an original image of an input bitstream according to a geographic location, so as to extract block data of interest in the region of interest, wherein the region of interest corresponds to an image of interest; according to the block data of interest, reconstructing the input bitstream to generate a reconstructed bitstream; decoding the reconstructed bitstream to generate a reconstructed decoded image; and converting the reconstructed decoded image into the interest image according to the interest block data.

The present invention further discloses a video decoding device for an electronic device, comprising a bit stream receiving unit for receiving an input bit stream; a decoding frame buffer for temporarily storing a reconstructed decoded image of the input bit stream ; And a processor, coupled to the bit stream receiving unit and the decoded frame buffer, is used to execute a decoded image block and a display position synchronization process, wherein the decoded image block and the display position synchronization process includes the above-mentioned decoded image block and Shows all steps of the location synchronization method.

The video decoding device of the present invention can capture the relevant image decoding data belonging to the region of interest in the image frame of the input bit stream according to the geographic location input by the user; under the condition of a given decoding frame buffer size, the relevant image decoding data can be obtained according to the relevant image decoding data. to reconstruct the input bitstream to generate the reconstructed bitstream; perform image decoding on the reconstructed bitstream to generate the reconstructed decoded image and temporarily store it in the decoded frame buffer; finally reconstruct the decoded image (for example, the tiles belonging to the region of interest ) for recombination to restore and produce a decoded image. In this way, the video decoding device of the present invention can decode the relevant picture blocks belonging to the region of interest without increasing the area of the decoding frame buffer, so as to ensure that the electronic device can display the decoded image normally, and avoid increasing the video The hardware cost of the decoding device. In addition, since the reconstructed bitstream is generated according to the geographic location input by the user and the relevant image decoded data corresponding to the region of interest, it can ensure that the decoded image displayed by the electronic device can be correctly mapped to the geographic location input by the user.

Description of drawings

FIG. 1 is a schematic diagram of loading a field of view from a world map according to a geographic location.

FIG. 2 is a schematic diagram of loading another viewing area from a world map according to another geographic location.

FIG. 3 is a functional block diagram of an electronic device according to an embodiment of the present invention.

FIG. 4 is a schematic diagram of an example encoding format of an HEVC bitstream.

FIG. 5A to FIG. 5F are schematic diagrams of block grouping and padding methods according to various embodiments of the present invention.

FIG. 6 is a flowchart of a process of synchronizing a decoded picture block and a display position according to an embodiment of the present invention.

FIG. 7 is a flowchart of a bit stream encoding process according to an embodiment of the present invention.

Symbol Description

E_MAP world map

L1, L2 location

FOV1, FOV2 field of view

ROI1, ROI2 area of interest

3 Electronics

30 Video decoding device

32 Image Processor

34 Display frame buffer

300 bit stream receiving unit

301 Area of Interest Location Unit

302 bitstream reconstruction unit

303 video decoder

304 Local area filling unit

305 Decode Frame Buffer

6.7 Process

601, 602, 603, 604, 701, 702, 703, 704, 705 Steps

Detailed ways

FIG. 3 is a functional block diagram of an electronic device 3 according to an embodiment of the present invention. The electronic device 3 includes a video decoding device 30 , a graphics processing unit (GPU) 32 and a display frame buffer 34 . The electronic device 3 may be a virtual reality device or a device such as a desktop computer, a notebook computer, and a smart phone.

The video decoding device 30 includes a bitstream receiving unit 300, a region of interest (ROI) positioning unit 301, a bit-stream rewriting (Bit-stream rewriting) unit 302, a video decoder 303, a local region padding ( Partial region filling) unit 304 and a decoded frame buffer 305 . The video decoding device 30 is coupled to the image processor 32 for decoding an input bit stream (eg, a video bit stream for panoramic virtual reality) to generate a decoded image to the image processor 32; then, image processing The processor 32 may write the decoded image to the display frame buffer 34 for display on the display. In one embodiment, the resolution of the original image included in the input bitstream is 8K*4K (8192*4320) pixels, and the resolution of the reconstructed decoded image is 4K*2K (4096*2560) pixels.

The video decoding device 30 can retrieve the relevant image decoding data belonging to the region of interest in an image frame of the input bitstream according to a geographic location input by the user; under the condition of a given size of the decoded frame buffer 305, the relevant image decoding data data to reconstruct the input bitstream to generate a reconstructed bitstream; perform image decoding on the reconstructed bitstream to generate a reconstructed decoded image and temporarily store it in the decoded frame buffer 305; regions) are reorganized to restore and produce a decoded image. In this way, the video decoding device 30 of the present invention can decode the relevant image blocks belonging to the region of interest without increasing the size of the decoding frame buffer 305, so as to ensure that the electronic device 3 can display the decoded image normally, and also An increase in the hardware cost of the video decoding apparatus 30 is avoided. In addition, since the reconstructed bit stream is generated according to the geographic location input by the user and the relevant image decoded data corresponding to the region of interest, it can ensure that the decoded image displayed by the electronic device 3 can be correctly mapped to the geographic location input by the user.

In one embodiment, the input bit stream is generated according to the coding standard defined by High Efficiency Video Coding (HEVC), as shown in FIG. 4 , which is a schematic diagram illustrating an example of the coding format of the HEVC bit stream. . The HEVC bit stream is composed of multiple groups of Network Abstraction Layer unit streams (NAL unit streams), which include multiple coded video sequences. Each coded video sequence is used to display a video, which includes an Instantaneous Decoding Refresh (IDR) access unit and a plurality of access units, and each access unit can be decoded into the coded video sequence of an image frame. An access unit contains multiple syntax elements (syntax

element), such as a video parameter subset (video parameter set, VPS), a sequence parameter subset (Sequence parameter set, SPS), a picture parameter subset (Picture parameter set, PPS), a supplemental enhancement information (Supplemental enhancement information) information, SEI) and a plurality of slices, wherein each slice includes a slice header and a slice data, and each slice includes a plurality of tiles. The subsets of parameters such as VPS, SPS, PPS, and SEI are classified as Non-Video Coding Layer (Non-VCL). VPS, SPS, and PPS are used to describe the relevant parameters required for decoding the entire image frame. SEI Used to describe user defined metadata, such as the location of a collection of motion-constrained tiles. The classification of multiple clips is a video coding layer, which is used to describe the relevant parameters required for decoding the multiple tiles included in the clip.

Please refer to Figure 3 again. The bitstream receiving unit 300 is coupled to the ROI locating unit 301, and is used for analyzing the input bitstream to extract relevant parameters required for decoding an image frame. In one embodiment, the bitstream receiving unit 300 parses a plurality of non-video coding layer parameter subsets (eg, parameter subsets such as VPS, SPS, PPS, etc.) of the access unit of the input bitstream to extract the parameter subsets contained in the access unit. Related parameters required for image frame decoding.

The region of interest locating unit 301 is coupled to the bitstream receiving unit 300 and the bitstream reconstruction unit 302, and is used for decoding the input bitstream according to the geographic location, so as to extract the relevant parameters required for decoding the region of interest of the image frame. (eg interest tile data). In one embodiment, the ROI locating unit 301 can decode a plurality of segment headers of the access unit; obtain all the tile configuration information of the image frame according to the picture parameter subset (PSP); latitude and longitude coordinates) and all tile configuration information, and extract the interest tile data belonging to the region of interest from multiple segments.

In one embodiment, the area of interest positioning unit 301 can read the user-defined data described in the auxiliary enhanced information, obtain the geographic location through an android application package (APK) or through a hardware positioning module. For example, the user can input the latitude and longitude through the user interface of the electronic device 3, so that the area of interest positioning unit 301 can obtain the geographic position; or, the system application component and the hardware positioning module of the electronic device 3 can automatically detect the user operation to Determine the latitude and longitude to obtain the geographic location.

The bitstream reconstruction unit 302 is coupled to the ROI locating unit 301 and the video decoder 303, and is used for converting the input bitstream into a reconstructed bitstream. In one embodiment, the bitstream reconstruction unit 302 can rewrite multiple non-video coding layer parameter subsets (eg, VPS, Subset of parameters such as SPS, PPS, SEI, etc.), then rewrite the fragment addresses of multiple fragment headers, and finally stitch the block data of interest into the fragment of the access unit in a byte-level format (stitch) data to generate a reconstructed bitstream.

In one embodiment, the bitstream reconstruction unit 302 re-encodes the video parameter subset (VPS) to describe the video coding profile and level, and re-encodes the sequence parameter subset (SPS) to describe the picture size and ranges; and re-encoding the Picture Parameter Subset (PPS) to describe the size of single tiles and tile sets.

In one embodiment, the bitstream reconstruction unit 302 re-encodes a video usability information (VUI) to describe information such as aspect ratio, overscan, and color primaries. . Furthermore, the bitstream reconstruction unit 302 encodes a plurality of segment headers to describe entry points belonging to the tiles of interest.

In one embodiment, the bitstream reconstruction unit 302 re-encodes the auxiliary enhancement information (SEI) according to the interest tile data and the decoded length and width (eg, the length and width of the decoded frame buffer 305 ) to describe the data belonging to the interest map. Block size and location. In one embodiment, the bitstream reconstruction unit 302 encodes any dummy bit or propriety bit in the bit-stream payload according to the interest tile data to describe the interest. The size and position of the tiles.

The video decoder 303 is coupled to the bitstream reconstruction unit 302 and the decoding frame buffer 305 , and is used for decoding the reconstructed bitstream to output the interest block data of the region of interest to the decoding frame buffer 305 . In one embodiment, the bitstream reconstruction unit 302 re-encodes the input bitstream according to the HEVC specification to generate a reconstructed bitstream, so the video decoder 303 may be an HEVC decoder.

The decoded frame buffer 305 is coupled to the video decoder 303 and the local area filling unit 304, and is used for buffering the blocks of interest to generate a reconstructed decoded image. In one embodiment, the video decoder 303 may configure the cache address and hardware space of the interest image block during decoding, so as to cache the interest image block in the decoding frame buffer 305 .

The local area filling unit 304 is coupled to the decoded frame buffer 305 and the image processor 32 , and is used for converting the reconstructed decoded image into a decoded image, so as to output the decoded image to the image processor 32 and buffer it in the display frame buffer 34 . In one embodiment, the local area padding unit 304 can directly buffer the decoded image in the display frame buffer 34 without going through the image processor 32 .

In one embodiment, given the length and width of the decoded frame buffer 305, the bitstream reconstruction unit 302 may group the plurality of interest tiles belonging to the region of interest into a plurality of partial images, wherein each partial image Equivalent to a set of motion-constrained tiles (or a subset of interest tiles). Therefore, the bitstream reconstruction unit 302 may re-encode the input bitstream according to the interest tile subset data of the plurality of interest tile subsets to generate a reconstructed bitstream. In this way, after the video decoder 303 decodes the reconstructed bitstream and buffers the reconstructed decoded images into the decoded frame buffer 305, the local area filling unit 304 can fill in the plurality of local images to Display location of the world map to restore the ROI image (ie, convert the reconstructed decoded image to a decoded image).

In one embodiment, the interest tile subset data indicates the height and width of the original image of the input bitstream, the number of multiple interest tile subsets, the location where the reconstructed decoded image is buffered in the decoded frame buffer 305, the decoded image buffer The position of the frame buffer 34, the height and width of the region of interest are displayed.

Table 1 is an example of the interest area locating unit 301 obtaining the interest block data. In the HEVC specification, "user_data_unregistered" is a functional syntax used to represent auxiliary enhancement information (SEI), which is used to transmit the interest block data (or interest map block subset data);

"uuid_iso_iec_11578" is a universally unique identifier (UUID) used to indicate that the auxiliary enhancement information is used to describe the tile layout;

"ROI_window" is a function used to extract the block data of interest;

"user_data_payload_byte" is a function used to pass interest tile data.

In the embodiment of Table 1, the ROI locating unit 301 can decode the input bitstream according to the geographic location to generate interest tiles such as "org_width, org_height, number_of_position, src_x, src_y, dst_x, dst_y, pos_w, pos_h", etc. data, let the bitstream reconstruction unit 302 re-encode the input bitstream according to the above-mentioned data. During decoding, when the video decoder 303 reads the function syntax of the auxiliary enhancement information (SEI) of "user_data_unregistered", it can recognize that the "uuid_iso_iec_11578" user-defined function tag is used to describe the tile layout, and finally reveals the Pass the interest tile data to the local area filling unit 304 through the "user_data_payload_byte" function. Therefore, the local region padding unit 304 can convert the reconstructed decoded image into a decoded image according to the interest tile data.

In one embodiment, based on experimental analysis, given the location and size of the decoded frame buffer and each tile, all possible tile grouping and padding methods can be listed to buffer the tile into the decoded frame. buffer. The block grouping and padding method can be compiled into a codebook, and the bitstream reconstruction unit 302 can perform block grouping and padding according to the codebook to reconstruct the bitstream; and then let the local area padding unit 304 reconstruct the bitstream according to the codebook. The reverse operation of tile grouping and padding is performed to restore the decoded image.

FIG. 5A to FIG. 5F are schematic diagrams of block grouping and padding methods according to various embodiments of the present invention. Assume that the length (x position) of the decoded frame buffer 305 is 10 units of resolution and the width (y position) is 8 units of resolution; the display frame buffer 34 is 15 units of resolution in length and 9 units of resolution in width, and Contains display register numbers 34(0) to 34(134).

In FIGS. 5A to 5C , the regions of interest are grouped into three partial images of interest, wherein the first partial image of interest is represented by a right oblique pattern, the second partial image of interest is represented by a dot pattern, and the third partial interest image is represented by a left oblique pattern. express.

5A-5C illustrate that the user moves the horizontal viewing angle (ie, the latitude of the geographic location) so that the displayed position of the area of interest changes but the size does not change. Accordingly, the interest block data in FIG. 5A indicates that the starting points of the first, second, and third partial images of interest are the display buffers 34(0), 34(10), and 34(55), respectively; the interest block in FIG. 5B The data indicates that the starting points of the first, second, and third partial images of interest are display buffer numbers 34 (30), 34 (40), and 34 (85), respectively; the interest image block data in FIG. 5C indicates the first, second, The starting points of the third part-of-interest images are display buffer numbers 34 ( 60 ), 34 ( 70 ), and 34 ( 115 ), respectively.

In FIG. 5D and FIG. 5E , the region of interest is grouped into two partial images of interest, wherein the first partial image of interest is represented by a right oblique pattern, and the second partial image of interest is represented by a dot pattern. 5D-5E illustrate that the user moves the horizontal viewing angle (ie, the latitude of the geographic location) so that the displayed position of the area of interest changes but the size does not change. Accordingly, the interest tile data in FIG. 5D indicates that the starting points of the first and second interest partial images are the display buffers 34(0) and 34(10), respectively; the interest tile data in FIG. 5E indicates the first and second interest images. The starting points of the partial images are display buffer numbers 34 (75) and 34 (85), respectively. In this way, when the user moves the horizontal viewing angle, it can be ensured that the decoded image displayed by the electronic device 3 can be correctly mapped to the geographic location input by the user.

FIG. 5F illustrates that the user moves the vertical viewing angle (ie, the longitude of the geographic location) so that the region of interest presents discontinuous images, wherein the first partial image of interest is represented by a right diagonal pattern and the second partial image of interest is represented by a dot pattern. Accordingly, the interest block data in FIG. 5F indicates that the starting points of the first and second partial images of interest are the display buffers 34(6) and 34(0), respectively, and the partial area filling unit 304 can The tile data of decoded frame buffer numbers 305(0) to 305(8) and 305(9) are respectively buffered to display buffer numbers 34(6) to 34(14) and 34(0), and so on. In this way, when the user moves the vertical viewing angle, it can be ensured that the decoded image displayed by the electronic device 3 can be correctly mapped to the geographic location input by the user.

Taking FIG. 5A as an example, when receiving the input bit stream, the area of interest positioning unit 301 can determine that the area of interest includes tiles corresponding to display buffer numbers 34(0) to 34(74) according to the geographic location, so as to generate interest region information; the bitstream reconstruction unit 302 can reconstruct the input bitstream according to the region of interest information to generate a reconstructed bitstream; the video decoder 303 decodes the reconstructed input bitstream to cache the pictures of interest in the region of interest in the decoded frame buffer 305 (the tile layout of the first, second, and third partial images of interest as shown in FIG. 5A ); finally, the partial area filling unit 304 buffers the first partial image of interest to display buffer numbers 34(0)-34(9 ), 34(15)~34(24), 34(30)~34(39), 34(45)~34(54), 34(60)~34(69), cache the second interest partial image to Display buffer number, 34(10)~34(14), 34(25)~34(29), 34(40)~34(44), cache the third-interest partial image to display buffer number, 34( 55) to 34 (59), 34 (70) to 34 (74), and other Figures 5B to 5F can be deduced by analogy.

The operation of the video decoding device 30 can be summarized as a decoding block and display position synchronization process 6 , as shown in FIG. 6 , wherein the decoding block and display position synchronization process 6 includes the following steps.

Step 601 : Determine a region of interest in an original image of an input bitstream according to a geographic location, so as to capture block data of the region of interest, wherein the region of interest corresponds to an image of interest.

Step 602: Reconstruct the input bitstream according to the interest tile data to generate a reconstructed bitstream.

Step 603: Decode the reconstructed bitstream to generate a reconstructed decoded image.

Step 604: Convert the reconstructed decoded image into an interest image according to the interest block data.

In the decoding block and display position synchronization process 6, step 601 can be performed by the bitstream receiving unit 300 and the region of interest positioning unit 301; step 602 can be performed by the bitstream reconstruction unit 302; step 603 can be performed by the video decoder 303; Step 604 may be performed by local region padding unit 304 and decoded frame buffer 305 . For the detailed operation of the decoding block and display position synchronization process 6, reference may be made to the above description.

In step 602, the bitstream reconstruction unit 302 may perform a bitstream encoding process 7 to generate a reconstructed bitstream, as shown in FIG. 7, wherein the bitstream encoding process 7 includes the following steps.

Step 701: Receive a current tile among a plurality of tiles in the input bitstream.

Step 702: Reconstruct a tile layout of the input bitstream according to the interest tile data of the region of interest.

Step 703: Determine whether the current tile belongs to the area of interest? If yes, go to step 704; if no, go back to step 701.

Step 704: Adjust the tile address of the current tile according to the tile layout.

Step 705: Generate a reconstructed bitstream.

In the encoding process 7, in step 702, the bitstream reconstruction unit 302 performs multiple non-video coding layer parameter subsets of the access unit (such as VPS, SPS, PPS, SEI and other parameter subsets according to the interest block data of the region of interest) ) to reconstruct the tile layout of the input bitstream. In steps 703 and 704, the bitstream reconstruction unit 302 encodes a plurality of segment headers to adjust the tile address of the current tile. In step 705, the bitstream reconstruction unit 302 encodes the interest tile data into the segment data of the access unit to generate a reconstructed bitstream.

To sum up, the video decoding device of the present invention can capture the relevant image decoding data belonging to the region of interest in the image frame of the input bitstream according to the geographic location input by the user; under the condition of a given decoding frame buffer size, Reconstruct the input bit stream according to the relevant image decoding data to generate the reconstructed bit stream; perform image decoding on the reconstructed bit stream to generate the reconstructed decoded image and temporarily store it in the decoded frame buffer; finally, the reconstructed decoded image (for example, belonging to regions of interest) are reorganized to restore and produce a decoded image. In this way, the video decoding device of the present invention can decode the relevant picture blocks belonging to the region of interest without increasing the area of the decoding frame buffer, so as to ensure that the electronic device can display the decoded image normally, and avoid increasing the video The hardware cost of the decoding device. In addition, since the reconstructed bitstream is generated according to the geographic location input by the user and the relevant image decoded data corresponding to the region of interest, it can ensure that the decoded image displayed by the electronic device can be correctly mapped to the geographic location input by the user.

The above descriptions are only preferred embodiments of the present invention, and all equivalent changes and modifications made according to the scope of the patent application of the present invention shall fall within the scope of the present invention.

Claims (20)

1. A method for synchronizing decoded picture blocks and display positions for a video decoding device comprises:

judging an interest region of an original image of an input bit stream according to a geographic position to capture interest block data of the interest region, wherein the interest region corresponds to an interest image;

reconstructing the input bitstream according to the interest block data to generate a reconstructed bitstream;

decoding the reconstructed bit stream to generate a reconstructed decoded image; and

and converting the reconstructed decoded image into the interest image according to the interest block data.

2. The method of claim 1, wherein the interest block data indicates a height and a width of the original image, a number of interest block subsets of the interest region, a decoded frame buffer address of the reconstructed decoded picture, a display frame buffer address of the decoded picture, and a height and a width of the interest region.

3. The method of claim 1, wherein reconstructing the input bitstream to generate the reconstructed bitstream according to the interest block data comprises:

according to the interest block data, a first user-defined syntax element of the input bitstream is re-encoded to generate the reconstructed bitstream.

4. The method of claim 3, wherein decoding the reconstructed bitstream to generate the reconstructed decoded image comprises:

decoding a second user-defined syntax element of the reconstructed bitstream; and

and allocating a decoding frame buffer address to the reconstructed decoded picture according to the user-defined syntax element to generate the reconstructed decoded picture.

5. The method of claim 4, wherein the step of converting the reconstructed decoded image into the image of interest according to the image of interest data comprises:

adjusting the decoding frame buffer address of the reconstructed decoding image to be a display frame buffer address according to the second user-defined syntax element so as to convert the reconstructed decoding image into the interest image.

6. The method of claim 3, wherein the first and second user-defined syntax elements are an assistant enhancement information syntax element, a dummy bit or a dedicated bit of the input bitstream and the reconstructed bitstream, respectively.

7. The method as claimed in claim 1, wherein the geographic location corresponds to a longitude, a latitude and a viewing angle.

8. The method of claim 1, further comprising:

reading a user-defined data of the input bitstream to obtain the geographic location.

9. The method of claim 1, further comprising:

and executing a system application component to read the geographic position.

10. The method of claim 1, further comprising:

the geographic position is read through a hardware positioning module of the video decoding device.

11. A video decoding apparatus for an electronic device, comprising:

a bit stream receiving unit for receiving an input bit stream;

a decoding frame buffer for temporarily storing a reconstructed decoded picture of the input bitstream; and

a processor, coupled to the bitstream receiving unit and the decoded frame buffer, for performing a decoding tile and display position synchronization process, wherein the decoding tile and display position synchronization process comprises:

judging an interest region of an original image of the input bit stream according to a geographic position to capture interest block data of the interest region, wherein the interest region corresponds to an interest image;

reconstructing the input bitstream according to the interest block data to generate a reconstructed bitstream;

decoding the reconstructed bitstream to produce the reconstructed decoded image; and

and converting the reconstructed decoded image into the interest image according to the interest block data.

12. The video decoding apparatus of claim 11, wherein the interest block data indicates a height and a width of the original picture, a number of interest block subsets of the interest region, a decoded frame buffer address of the reconstructed decoded picture, a display frame buffer address of the decoded picture, and a height and a width of the interest region.

13. The video decoding apparatus of claim 11, wherein the step of reconstructing the input bitstream according to the interest block data to generate the reconstructed bitstream comprises:

according to the interest block data, a first user-defined syntax element of the input bitstream is re-encoded to generate the reconstructed bitstream.

14. The video decoding apparatus of claim 13, wherein the step of decoding the reconstructed bitstream to generate the reconstructed decoded picture comprises:

decoding a second user-defined syntax element of the reconstructed bitstream; and

and allocating a decoding frame buffer address to the reconstructed decoded picture according to the user-defined syntax element to generate the reconstructed decoded picture.

15. The video decoding apparatus of claim 14, wherein the step of converting the reconstructed decoded picture into the picture of interest according to the tile of interest data comprises:

adjusting the decoding frame buffer address of the reconstructed decoding image to be a display frame buffer address according to the second user-defined syntax element so as to convert the reconstructed decoding image into the interest image.

16. The video decoding apparatus of claim 13, wherein the first user-defined syntax element and the second user-defined syntax element are an assistant enhancement information syntax element, a dummy bit or a dedicated bit of the input bitstream and the reconstructed bitstream, respectively.

17. The video decoding apparatus of claim 11, wherein the geographic location corresponds to a longitude, a latitude, and a view angle.

18. The video decoding apparatus of claim 11, wherein the decoding tile and display position synchronization process further comprises:

reading a user-defined data of the input bitstream to obtain the geographic location.

19. The video decoding apparatus of claim 11, wherein the decoding tile and display position synchronization process further comprises:

the geographic location is read through a system application component of the electronic device.

20. The video decoding apparatus of claim 11, wherein the decoding tile and display position synchronization process further comprises:

the geographical position is read through a hardware positioning module of the electronic device.

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