JPH11239347A - Image data coder and image data coding method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use an HDTV(high definition television) image data compression coding section capable of conducting SDTV(standard television) compression coding processing for SDTV of a plurality of systems by making variable the window size and its position of a plurality of image data area fetch sections that receive part of input images as a window. SOLUTION: In the case of selecting HDTV data by image data changeover selection sections 1-4, received image data S1 are given to image area fetch sections 5-8 and signals S10-S13 divided into four areas are compressed by image data compression coding sections 9-12 to obtain data S14-S17. Time information addition sections 14-17 add the same time information S18 to the data S14-S17 to obtain data S19-S12, which are outputted via a multiplexer section 18. Furthermore, in the case of selecting an SDTV signal, SDTV image data S2-S5 are used as four independent image data and an entire image or a valid pixel area is given to the fetch sections 5-8 and the result is given to coding sections 9-12 as received image data S10-S13, and time information S18 is added similarly to the case with HDTV, a multiplexer section is multiplexes the data to provide an output of coded data S23.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for compressing and encoding image data, and transmitting, storing and recording the image data.
The present invention relates to a device that selects one of image signals having different resolutions such as (high definition television) and SDTV (standard television) and performs compression encoding processing by sharing the same compression encoding device.

[0002]

2. Description of the Related Art The video information of HDTV (High Definition Television High Definition Television) is several times larger than the number of effective pixels of SDTV when compared with the number of effective pixels of a screen. For example, if the number of effective pixels of an HDTV is 1152 × 1024 and the SDTV
When the number of effective pixels of (Standard Definition TV) is 704 × 480, it has about 3.5 times as much information. Therefore, when compressing and encoding HDTV video data using a compression method such as MPEG while maintaining the resolution, SDTV (standard television signal)
Is required for the image data compression encoding unit.

For this reason, a method of preparing a plurality of image data compression encoding sections and operating them in parallel is generally adopted. A proposal for sharing the SDTV and the HDTV has been described in Japanese Patent Application Laid-Open No. Hei 7-107466. However, since it is intended for hierarchical encoding, a single image data encoding apparatus can be used to provide one HDTV system or SDTV
And the HDTV image data compression and encoding unit itself has the ability to process a plurality of SDTV video data, but does not use its hardware resources effectively. there were.

[0004]

As described above, the HDT
The HDTV image data compression encoding unit itself of the V image data encoding device is not effectively used, despite having the ability to compress and encode SDTV video data in a plurality of systems. . Therefore, the present invention provides an SD
H having an arithmetic processing configuration capable of also performing TV compression encoding processing
The DTV image data compression / encoding unit is provided with a plurality of SDTs.
It is an object of the present invention to enable use as a V image data compression encoding unit.

[0005]

In order to achieve the above object, in an image data encoding apparatus which divides the same screen and performs image data compression processing in parallel, the first image data S1 supplied and the A plurality of image data switching selectors (1 to 4) for switching and selecting a plurality of second image data (S2 to S5) having a lower resolution than one image data; A plurality of image data area capturing units (5 to 8) for capturing at least a part of the input image data as windows, and a plurality of image data compression codes for compressing and encoding the image data of each image area capturing unit. Multiplexing sections (9 to 12), and a multiplexing section 18 that collectively converts the compressed data from the plurality of image data compression / encoding sections into one coded data. That win The Usaizu and window position was variably.

In the image data encoding apparatus, the image data area capturing units (5 to 8) include a memory to which the input image data is supplied, and a signal S26 indicating a window size and a window position in the memory. And a writing window generating unit for supplying the data. Further, in the image data encoding device, the compressed encoded data (S14 to S14) from the image data compression encoding unit (9 to 12) is transmitted.
S17) is provided with a time information generating unit 13 for adding the same time information S18 to each of them.

Further, in the image data encoding method for dividing the same screen and performing image data compression processing in parallel, the first image data supplied and a plurality of second image data having a lower resolution than the first image data are supplied. A plurality of image data switching selection steps for switching and selecting image data; and a plurality of image data area capturing steps for capturing at least a part of the input image data as a window from the input image data selected in each of the image data switching selection steps. A plurality of image data compression / encoding steps for compressing / encoding the image data in each of the image area capturing steps; and converting the compressed data from the plurality of image data compression / encoding steps into one encoded data. A multiplexing step, wherein each of the image area capturing steps includes a window size and a window position. Possible and the.

(Operation) When high-resolution image data is selected as input image data, the same screen is divided and encoded by a plurality of video encoding units in parallel, multiplexed to form one code. When low-resolution image data is switched and selected as the input image data, a plurality of the low-resolution image data are individually encoded to generate encoded data. I did it.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of an image signal encoding apparatus according to the present invention. The image signal encoding device shown in FIG.
4, image area capturing units 5 to 8, image data compression encoding unit 9
To 12, a time information generating unit 13, a time information adding unit 14 to 1
7 and a multiplexing unit 18.

First, when the input image data is an HDTV (High D
In the case of efinition TV (high-definition television), a sampling section (not shown) arranged in the preceding stage of the present invention is used, and the information amount is about four times that of SDTV (Standard Definition TV standard television). The input image data is sampled at such a sampling frequency, and the sampled input image data is defined as S1. For example, the sampling frequency of SDTV is 13.5
MHz, whereas the sampling frequency of HDTV is 4
Set to 4.55MHz.

[0011] The image data switching selection units 1 to 4 use an HDTV
When the signal is selected, the input image data S1 is supplied to all of the image area capturing units 5 to 8. As shown in FIG. 2, the input image data S1
Is decomposed into four horizontal and vertical regions (regions 1 to 4), and the image region capturing units 5 to 8 capture different regions of a 1/4 screen. For example, the area 1 is the image capturing unit 5,
The area 2 is the image capturing section 6, the area 3 is the image capturing section 7, the area 4
Is an image capturing unit 8 and the like.

The signals in the area are supplied as S10 to S13 to the following image data compression and encoding units 9 to 12, respectively.
The compression encoding units 9 to 12 compression-encode the input area signal. A method such as MPEG is used for compression encoding.

The encoded data S14 to S17 generated by the compression encoders 9 to 12 are added to the same time information S18 generated by the time information generator 13 by the time information adders 14 to 17, and the time information is added. It generates encoded data S19 to S22 including the data. The generated data S19 to S22 are multiplexed by the multiplexing unit 18 to generate one encoded data S23. The generated data S23 is data to be recorded on a recording medium or transmitted. Although not described here, on the receiving side, it is possible to synchronize the four image data based on the time information and completely reproduce it as one image data.

The image data switching selection units 1 to 4 use the SDTV
When the signals (SDTV1 to SDTV4) are selected, the four image data E6 to E9 shown in FIG. 3 are taken as four independent image data from the SDTV image data S2 to the SDTV image data S5, and each image area is captured. Captured in parts 5-8. The area to be captured is the entire screen or an area of effective pixels, for example, one frame 70
Capture an area of 4 x 480 pixels. The captured image data S1
0 to S13 are connected image data compression / encoding units 9-1.
2 is input. The compression encoding units 9 to 12 compression-encode the input area signal. Similarly, M
A method such as PEG is used.

In the case of SDTV, the encoded data S14 to
In S17, the same time information S18 generated by the time information generating unit 13 is added by time information adding units 14 to 17 to generate encoded data S19 to S22 including the time information. The receiving side need not use this information to synchronize the image data S2 to S5.

In addition, in the image data areas E6 to E9, image data that does not need to be actually recorded or transmitted on a recording medium is not subjected to compression encoding, and a code amount is allocated to other compressed data accordingly. May be used to improve the image quality of recording or transmission. Encoded data
The multiplexing unit 18 multiplexes S19 to S22 to generate one encoded data S23. The encoded data S23 is data to be recorded on a recording medium or transmitted. Although not described here, on the receiving side, the image data is decoded by an independent decoding unit, and the image data is reproduced on an independent SDTV monitor TV.

Next, the image area capturing units 5 to 8 forming the present invention will be described below with reference to FIG. In the image area capturing units 5 to 8, the divided screen is gated as a window and recorded in the memory 19. It is assumed that the position and size of the image to be gated can be selected from arbitrary or set several values.

The operation of the image capturing unit 5 will be described with reference to FIG. 4, but the operation of the image capturing units 6 to 8 is the same. In FIG. 4, the image mode control signal S25 is a control signal for selecting either HDTV or SDTV as the input image data.

When HDTV is selected by the image mode control signal S25, one of the image data of the four areas E2 to E5 in FIG. 2 divided by the capture area selection signal S24 is selected. FIG. 5 shows a case where the image data area E2 is selected. The capture area selection signal S24 is input to the horizontal position setting unit 20 and the vertical position setting unit 21 shown in FIG. 4, respectively, and the window horizontal start indicating the position of the window for recording in the memory 19 for the input image data S6. position
Hs, the window horizontal end position He, the window vertical start position Vs, and the window vertical end position Ve are sent to the writing window generating unit 22.

The write window generating section 22 shown in FIG. 4 gates the input image data S6 which is continuously input, and stores only the rectangular image data area E2 specified by S26.
It is stored in the memory 19. The image area to be recorded is read by the supplied common synchronizing signal S27, and the captured image data S10
Is supplied to the compression encoding unit 9 shown in FIG.
Receives compression encoding processing.

Next, the image mode control signal S25 outputs the SDT
When V is selected, the window horizontal start position signal Hs indicating the position of the window for recording in the memory 19 and the window horizontal start position signal Hs for the input image data S6 regardless of the state of the capture area selection signal S24. The horizontal end position signal He, the window vertical start position signal Vs, and the window vertical end position signal Ve are sent to the write window generator 22.

That is, in the case of SDTV as shown in FIG. 6, the gate of S26 is opened instead of the window area as a result, and all the data of the image data area E6 may be stored in the memory 19 at any time. Image data area E1 in FIG.
As shown in FIG.
9 may be stored. As in the case of HDTV, the data of the image area to be recorded is read out by the common synchronizing signal S27, supplied to the compression encoding section 9 shown in FIG. 1 as captured image data S10, and subjected to compression encoding processing. .

[0023]

As described above, the image signal encoding apparatus according to the present invention divides the same screen into a plurality of video signals when high-resolution image data is selected as input image data. The unit performs encoding in parallel, multiplexes to generate one encoded data, and when low-resolution image data is switched and selected as the input image data, a plurality of the low-resolution image data Are independently encoded to generate encoded data,
It is possible to provide a device that selects one of image signals having different resolutions, such as HDTV (high definition television) and SDTV (standard television), and performs compression encoding processing. INDUSTRIAL APPLICABILITY The image signal encoding apparatus according to the present invention can share a part of a circuit and a device, and has good utilization efficiency.

[Brief description of the drawings]

FIG. 1 shows a configuration diagram of an embodiment of an image signal encoding apparatus according to the present invention.

FIG. 2 Split HDTV (High Definition Television)
FIG. 3 is a diagram for explaining the image of FIG.

FIG. 3 is a diagram showing images of a plurality of SDTV (standard television) inputs.

FIG. 4 is a diagram illustrating a configuration of an image capturing unit of an embodiment of an image signal encoding apparatus according to the present invention.

FIG. 5 is a diagram showing an example of a capture area in the case of HDTV.

FIG. 6 is a diagram showing an example of a capture area in the case of SDTV.

FIG. 7 is a diagram showing an example of a capture area in the case of SDTV.

[Explanation of symbols]

 1-4 Image data switching and selecting section 5-8 Screen area capturing section 9-12 Compression encoding section 13 Time information generating section 14-17 Time information adding section 18 Multiplexing section 19 Memory 20 Horizontal position setting section 21 Vertical position setting Unit 22 Write window generating unit E1 to E10 Image (data) area He window horizontal end position signal Hs window horizontal start position signal S1 image data (first image data, HDTV) S2 to S5 image data (second image data, SDTV) S10 to S13 Captured image data S14 to S17, S19 to S22, S23 Encoded data S18 Time information S24 Capture area selection signal S25 Image mode control signal S27 Common synchronization signal Ve Window vertical end position signal Vs Window vertical start position signal

Claims (4)

[Claims] An image data encoding apparatus for dividing the same screen and performing image data compression processing in parallel, wherein the supplied first image data and a plurality of second image data having a lower resolution than the first image data are provided. A plurality of image data switching selecting units for switching and selecting image data; and a plurality of image data area capturing units for capturing at least a part of the input image data as a window from the input image data selected by each of the image data switching selecting units. A plurality of image data compression encoding units for compressing and encoding the image data of the image area capturing units; and a multiplexing unit for converting outputs of the plurality of image data compression encoding units into one encoded data. An image data encoding device, wherein each of the image area capturing units is capable of changing its window size and window position. 2. The image data encoding device according to claim 1, wherein the image data area capturing unit includes a memory to which the input image data is supplied, and a signal indicating a window size and a window position in the memory. And a writing window generator for supplying the image data. 3. The image data encoding device according to claim 1, further comprising: a time information generating unit that adds time information to each of the compressed data from the image data compression encoding unit. Image data encoding device. 4. An image data encoding method for dividing the same screen and performing image data compression processing in parallel, wherein the supplied first image data and a plurality of second image data having a lower resolution than the first image data are provided. A plurality of image data switching selection steps for switching and selecting image data; and a plurality of image data area capturing steps for capturing at least a part of the input image data as a window from the input image data selected in each of the image data switching selection steps. A plurality of image data compression / encoding steps for compressing / encoding the image data in each of the image area capturing steps; and converting the compressed data from the plurality of image data compression / encoding steps into one encoded data. A multiplexing step, wherein each image area capturing step is capable of changing its window size and window position. An image data encoding method, characterized in that: