JPH0723205A - Synthesized pattern generating method - Google Patents

Abstract

PURPOSE:To prevent deterioration in a video quality due to synthesis by applying synthesis processing to a coded video signal while being compressed. CONSTITUTION:A signal unit being the object of synthesis is extracted (121, 122) from plural video signals as a unit for synthesizing a larger signal unit not giving effect onto coding even through division and position information of each signal unit is adjusted to match a display, desired position and a synthesized video signal is generated (140). When one pattern is not finished by the extracted signal unit, the deficient signal unit is added by using a header corresponding to the signal unit as a dummy to make one pattern complete.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is based on CCITT Recommendation H.264. Two
The present invention relates to a composite screen creating method for processing a video signal coded by a coding device compliant with 61 in the state of the coded signal as it is, and synthesizing a plurality of video parts to create one video.

[0002]

2. Description of the Related Art When a part of an image is combined with another image by a conventional method, the image signal is bit-mapped, the part of the image signal to be combined is extracted, the address is changed, etc. It was done to replace the part of the same address of the other video.

[0003]

In the conventional method, since the video signal is processed by the bit map, the signal compressed by the encoding device cannot be combined as it is, and it is decoded once and the data is decompressed. Had to do.
It is necessary to re-encode the combined video signal when sending it to another, but the image quality deteriorates when the decoding and coding processes are performed, so the post-composition video is the video that has not been processed. There is a drawback in that the image quality is deteriorated when compared with.

The present invention has been made in order to solve this drawback, and is one in which a coded video signal is subjected to a synthesizing process as a data-compressed video signal.

[0005]

According to the present invention, a screen is divided by a predetermined division unit, and the video portion of the division unit is encoded by an encoding method so that the video portion is composed of a predetermined number of pixels. A video signal, which is encoded by the encoding method, is composed of a small signal unit for encoding and a large signal unit that bundles them, and which signal unit is each signal unit? Alternatively, the processing is performed by noting that the header is composed of the header including the position information indicating the display position when displayed and the content of the signal unit. That is, in the invention according to claim 1,
A large signal unit that does not affect the coding even if divided is used as a unit for combining, the signal units to be combined are extracted from multiple video signals, and the position information of each signal unit is displayed at the desired display position. Adjust to match and create a composite video signal. In the invention according to claim 2, the extracted signal unit is 1
This is an invention in the case where the screen is not completed, and the insufficient signal unit is added with a header corresponding to the signal unit as a dummy to complete one screen.

FIG. 1 is a schematic explanatory view of the present invention. The video signals of the screens 101 and 102 to be combined are respectively C
CITT Recommendation H.264 It is encoded by an encoding device or the like conforming to H.261 (processing 111, 112). Screen 101, 10
, X1, X2, ..., Y1, Y2, ... in 2 are screen division units that are units of data compression. Each division unit is extracted from the encoded video signal (processing 121,
122). Next, the position information in the extracted header information of the division unit is adjusted so as to represent the desired display position of the screen to be combined (process 131, 132). These video signals are combined to create a composite video signal (process 14).
0). By displaying the composite video signal, a screen such as the composite screen 150 in which the screen 101 and the screen 102 are composited can be obtained. In the combining process 140, when the number of division units is less than the predetermined number, a dummy signal is added to complete the combined screen 150.

[0007]

Since the signal units extracted from a plurality of video signals have the same format, if they are adjusted and combined so that the position information of the header does not overlap, they can be present as a new one-screen video signal. In the present invention, the signal unit to be combined is extracted, and the position information of the header portion is adjusted and combined according to the display position without changing the video data, so that the content of the displayed video does not change at all. , A new video signal whose display position is changed according to the adjustment result of the position information is obtained. Further, according to the invention of claim 2, only the header is transmitted when there is no video data. When a single screen cannot be constructed with only the extracted signal units, a header corresponding to the lacking part is added as a dummy of the lacking part to complete the video signal.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention is based on CCITT Recommendation H.264. The screen is divided like a video signal encoded in accordance with H.261,
A video signal is a signal of a method of compressing data in units of the signals corresponding to the divided screens, and a video signal for which a plurality of methods are prepared for the number of screen divisions is targeted.

Prior to the description of the embodiments of the present invention, H. 26
The features of the video signal encoded by the 1-compliant encoder will be briefly described. H. In H.261, the video signal is CI
It is encoded in a format called F or QCIF. FIG. 12 shows an outline of the structure of a signal encoded by CIF or QCIF. This signal is composed of encoded video data and a header for transmitting various information.

In FIG. 12, reference numeral 31 denotes a header added for each screen division, which is called a frame header (or picture header). PT in frame header 31
Information called YPE (type information) has a flag called a source format for identifying CIF or QCIF. The part of the frame 32 following the frame header 31 is a division unit of the screen.
(Group of Blocks). GOB3
2 includes a GOB header 33 and an MB (macroblock) 34 which is a smaller screen division unit. GO
The B header 33 includes GN (GOB number) which is information for identifying which GOB. MB
34 comprises an MB header 35 and a block 36 which is a smaller screen division unit. Encoding is performed in block units. In the MB header 35, the MB is GOB
MBA which is information for identifying which MB in the MB
(Macroblock address) and information for distinguishing whether the coding of the block in the MB is coding with motion compensation or coding without motion compensation is included. When there is no motion compensation, the coding of the image information in the MB is independent for each block, but when there is the motion compensation, it is coded based on the relation with the image information of the adjacent MB. The MB existing at the outermost periphery of the image has a feature that the outside does not affect each other with respect to motion compensation.

When coded by CIF, there are 12 GOBs 32 constituting one screen.
GN of 1 to 12 is given to. Further, when encoded by QCIF, one screen is composed of three GOBs 32, and GNs of 1, 3, and 5 are given to these GOBs 32.

FIG. 13 shows G when coded by CIF.
How to divide the screen by OB unit and G at each position on the screen
It is a figure which shows GN of OB. In FIG. 13, 37 represents the entire screen, and 38 represents GOBs corresponding to respective positions on the screen.
FIG. 14 is a diagram showing how to divide a screen by GOB unit and GN of GOB at each position on the screen when encoded by QCIF. In FIG. 14, 37 indicates the entire screen, and 39 indicates GOB corresponding to each position on the screen. Figure 1
3, as is clear from FIG. 14, the number of GOBs of the signal coded by QCIF is G of the signal coded by CIF.
It is 1/4 of the number of OBs.

FIG. 15 shows how each GOB is divided into MBs. In FIG. 15, 40 is a portion excluding the GOB header of each GOB, and 41 is an MB corresponding to each position on the screen in the GOB. Even when encoded with CIF, QC
Even when coded by IF, the number of MBs 41 forming the GOB is the same, and the number is 33. Therefore, QCI
The number of pixels of the signal encoded by F is 1/4 of the number of pixels of the signal encoded by CIF.

According to the present invention, signals are extracted from a plurality of video signals in units of GOB or MB, and in the case of GOB units, G is extracted.
The same GO in MB units so that N does not overlap
In B, the MBAs are adjusted and combined so that they do not overlap to create one video signal. Hereinafter, the present invention will be described in detail according to examples.

FIG. 2 is a relationship diagram between GOB and display position for explaining the embodiment of the present invention. An example in which one video signal is created by synthesizing a part of another video signal with another video signal will be described with reference to FIG. 1 is the entire screen when the video signal A is displayed, 2 is the entire screen when the video signal B is displayed, 3 is each GO when the video signal A is displayed
B indicates the display position and display content, and 4 indicates the display position and display content of each GOB when the video signal B is displayed. Each GOB
The characters and numbers of A1 to A12 and B1 to B12 in parentheses for distinguishing the display contents of each GOB of each video signal. Since this is an example of the case of being encoded by CIF, one screen of both video signals A and B is composed of 12 GOBs.

For example, when the upper half of the screen 1 and the lower half of the screen 2 are combined, the video signals A to GN of 6 from 1 to 6 are used.
6 Gs with 7 to 12 GNs from GOB and video signal B
OBs are extracted and combined to form one new video signal. FIG. 3 is a diagram showing how a composite image is displayed. Reference numeral 5 denotes the entire screen of the composite video, the upper half of which is the same as the upper half of the screen 1 and the lower half is the same as the lower half of the screen 2.

In addition, for example, when the upper half of the screen 1 and the upper half of the screen 2 are combined, six GOBs having GNs 1 to 6 of the video signal B are extracted, and then those GNs 7 to 12 are extracted. To the six GOBs of the video signal A of 1 to 6 or the six GOs of which the GN of the video signal A is 1 to 6
After extracting B, the GNs thereof are changed to 7 to 12 and combined with 6 GOBs of 1 to 6 of the video signal B to form one new video signal. FIG. 4 is a diagram showing how the composite video is displayed. 6 or 7 is the whole screen of the composite video, the upper half is the same as the upper half of screen 1 and the lower half is the same as the upper half of screen 2, or the upper half is the same as the upper half of screen 2, The lower half is the same as the upper half of screen 1.

In the above, six GOBs are provided from each video signal.
Although the example of extracting and combining is described, if the number of GOBs extracted from both video signals is 12, the combination of any number of GOBs at any position is possible.

An example of a processing procedure for extracting and combining six GOBs from each video signal will be described with reference to the flowchart of FIG. (a) Encode the first video with CIF.

(B) The encoded first video signal is extracted in GOB units. (c) Similarly, the second video is encoded by CIF. (d) The encoded second video signal is extracted in GOB units.

(E) Next, each GOB number (GN) of the first video signal does not overlap with each GOB number (GN) of the second video signal, and the number of GOBs is 12. To combine GOBs.

(F) The 12 combined GOBs are used as a combined video signal. (g) Display the composite video signal on the screen. (h) As a result, a composite screen is created from the first video and the second video.

FIG. 6 is a diagram for explaining an embodiment in which four images are combined. Reference numerals 8, 9, 10, and 11 respectively represent one screen when the video signals C, E, D, and F are displayed. Reference numerals 12, 13, 14, and 15 represent GOBs forming the video signals C, E, D, and F, respectively. Also, each GO
C1 to C12, D1 to D12, E in parentheses attached to B
The letters and numbers 1 to E12 and F1 to F12 are for distinguishing the display contents of each GOB of each video signal.

For example, the upper left 1/4 of the screen 8, the upper right 1/4 of the screen 9, the lower left 1/4 of the screen 10, the lower right 1 / of the screen 11
In the case of synthesizing the portion of 4, the video signals C to GN are three GOBs of 1, 3 and 5, and the video signals D to GN of 2,
Three GOBs 4, 6 and GN from video signals E to 7,
Three GOBs 9 and 11, GN from video signal F is 8, 1
Three GOBs 0 and 12 are extracted, and these are combined to create one video signal. FIG. 7 is a diagram showing how the composite video is displayed. 16 represents the entire screen of the composite video, and the upper left 1/4 is the same as the upper left 1/4 of the screen 8,
The upper right 1/4 is the same as the upper right 1/4 of the screen 9, and the lower left 1/4
Is the same as the lower left quarter of the screen 10, and the lower right quarter is the screen 1
It is the same as the lower right quarter of 1.

Further, for example, in the case of combining one upper left quarter portion of each of the screens 8 to 11 to form one screen, the GNs of the video signals C to F have GOBs of 1, 3 and 5 respectively.
G of GOB extracted from video signal D
G of GOB extracted from video signal E with N set to 2, 4, 6
N is changed to 7, 9, 11 and GN of GOB extracted from the video signal F is changed to 8, 10, 12, and these are combined to create one video signal. FIG. 8 is a diagram showing how the composite video is displayed. Reference numeral 17 represents the entire screen of the composite video, the upper left 1/4 is the same as the upper left 1/4 of the screen 8, the upper right 1/4 is the same as the upper left 1/4 of the screen 9, and the lower left 1/4 is the screen 10. Same as upper left quarter, lower right quarter is screen 11
It is the same as the upper left quarter of.

In the above description with reference to FIG. 6, an example in which four GOBs are extracted from each video signal and combined is explained, but extraction is performed so that the number of GOBs extracted from all video signals is 12. If so, it is possible to combine any number of GOBs at any position.

In the above, G from 2 or 4 video signals is used.
Although an example in which OBs are extracted and combined is shown, a total of 12 GOBs may be extracted from 3 or 5 or more video signals and combined in the same manner as described above.

When the number of extracted GOBs is less than 12, the condition of the video signal encoded by CIF is not satisfied, so that the video signal cannot be received by the decoding device. In the present invention, in this case, only the GOB header is reproduced for the missing GOB. An embodiment in this case will be described with reference to FIG.

For example, the upper left 1 of each of the screens 8-10
In the case of constructing one screen by combining / 4 parts, GOBs having GNs of video signals C, D, and E of 1, 3, and 5 are respectively extracted, and GNs of GOBs extracted from the video signal D are extracted.
GN of GOB extracted from video signal E to 2, 4 and 6
To 7, 9, and 11. The portion corresponding to the lower right quarter of the screen is, for example, 3 when the GN of the video signal C is 8, 10, or 12.
The GOB header of each GOB is extracted and the GN is 8, 10,
Twelve GOB dummy signals are used. These signals are combined to create one video signal.

FIG. 9 is a diagram showing how a composite image is displayed when a dummy signal is used. Reference numeral 18 represents the entire screen of the composite video. In the upper left 1/4, the same video as the upper left 1/4 of the screen 8, in the upper right 1/4, the same video as the upper left 1/4 of the screen 9, and in the lower left 1 The same image as the upper left quarter of the screen 10 is displayed on / 4. There is no display in the lower right quarter.

An example of the processing procedure for combining the upper left quarter of each of the above three screens will be described with reference to the flowchart of FIG. (a) Encode the first, second and third images by CIF.

(B) For the encoded first, second and third video signals, the GOB number (GN) is 1.3.5.
Extract OB. (c) GOB of the first video signal and GOB number is 1
It is assumed that the GOB of the video signal to be synthesized is 3.5 and the GOB number of the GOB is 3.5.

(D) GOB of the second video signal, which is GO
G number of the video signal to be combined with B number 1.35.
It is assumed that the OB has a GOB number of 2,4,6. (e) GOB of the third video signal and GOB number is 1
The GOB of the video signal to be synthesized is 3.5, and the GOB number of the GOB is 7.9.11.

(F) With respect to the first video signal, the GOB header of the GOB whose GOB number is 8.10.12 is extracted. (g) GOB of the first video signal and GOB number is 8
The GOB header of the GOB of 10.12 is the GOB of the video signal to be combined and the GOB number is 8.10.12.
The dummy signal of

(H) 12 of the video signals to be synthesized by the above
There will be one GOB. (i) Display the composite video signal on the screen. (j) As a result, a combined screen in which the upper left quadrant of each of the first, second and third video signals is combined is created.

In the above description, when the GN is displayed at a position different from the original position in the composite screen, the GN is changed to the GN corresponding to the new position, but the GOB header and the contents of the GOB are separated. It is also possible to obtain a composite signal without modification processing by the method of extracting into. For example, in the case of creating the composite screen shown in FIG. 8, GOBs having GNs of 1, 3, and 5 are extracted from the video signal C, and the video signals D to G are extracted.
GOB header with N = 2,4,6 and G with GN = 1,3,5
OB content is extracted and GN is 7, 9, 1 from video signal E
The contents of the GOB header of 1 and the GOB of GN of 1, 3, 5 are extracted, and the GOB of GN of 8, 10, 12 from the video signal F is extracted.
The contents of the GOB whose header and GN are 1, 3 and 5 are extracted, and these are combined to create one video signal.

Although the method of synthesizing in GOB units has been described above, it is also possible to synthesize in MB units. In this case as well, the same idea as in the case of combining in GOB units is used.
The contents of each header and MB are extracted and combined so as to correspond to the display position after combining the B header and MB header, and one video signal is obtained.

Although the video signal coded by CIF has been described above, the video signal coded by QCIF can be combined in GOB unit or MB unit as in the case of CIF.

FIG. 11 is a block diagram of an example of an apparatus for carrying out the method of the present invention described above. The header detection unit 19 receives the CIF or QC input from the input end 20.
The video signal encoded by the IF is received, the frame header and GOB header are detected, and timing signals at the head of the frame header and the head and tail of the GOB header are generated. Reference numeral 21 denotes a frame memory, which receives the video signal input from the input terminal 20 via the delay unit 22 and temporarily stores it under the control of the control unit 23. Various headers and video data are stored in predetermined positions on the frame memory 21. Since the header is not fixed length, prepare the maximum expected capacity for the part that stores the header.

The control unit 23 receives the timing signal from the header detection unit 19, and detects the start of the frame header, G
Each timing of the head of the OB header and the head of the content following the GOB header is identified, and the delay time of the delay unit 22 and the writing of the frame memory 21 are controlled based on the identified timing. The delay time of the delay unit 22 is controlled so that the input timing of the video signal to be write-controlled to the frame memory 21 matches the write control timing of the control unit 23 to the frame memory 21.
A first-in first-out register (FIFO) can be used for the delay unit 22, for example.

When there are n video signals to be combined, n sets of header detection section 19, frame memory 21, and delay section 22 are prepared. In the case of FIG. 11, four sets of examples are shown. In the following, it is assumed that the video signal C is input to the input terminal 20 ₁ , the video signal D is input to the input terminal 20 ₂ , the video signal E is input to the input terminal 20 ₃ , and the video signal F is input to the input terminal 20 ₄ .

Reference numeral 24 denotes a video composition information generating section. For example, in the case of composing the upper left ¼ portion of each of the screens 8 to 11, the GN of the video signals C to F is 1, 3, 3.
GOB of No. 5 is designated as a synthesis target, and the video signal C
GN is 1, 3, 5, GN is 2, 4, 6 for video signal D, GN is 7, 9, 11, for video signal E,
GN is 8, 10, 12 for the video signal F
It is designated as the display position of the OB and is used as the video composition information. These pieces of video composition information can be stored in advance in a memory such as a ROM in the video composition information generating unit 24, can be input using a keyboard, or can be generated by a method such as specification by switching a switch. it can.

These pieces of video composition information are sent to the control unit 23.
And is stored in the memory 25 attached to the control unit 23.
It The control unit 23 controls the composite information stored in the memory 25.
According to the report, the read control of the frame memory 21 is performed.
In the case of the example given here, for example, the frame memory
21₁First, GOB with frame header and GN = 1
And GN read GOB header 2 and then frame
Memory 21₂To the contents of GOB with GN of 1 and frame
Mori 21₁To GOB with GN of 3 and GOB with GN of 4
Frame memory 21₂To GOB with GN of 3
Y, frame memory 21₁To GN 5 GOB and GN
GOB header of 6 and frame memory 21 ₂To GN
5 GOB contents, frame memory 21₁To GN 7
GOB header and frame memory 21₃To 1 for GN
Contents of GOB, frame memory 21 ₁To G with an GN of 8
OB header, frame memory 21_FourTo GO with 1 GN
Contents of B, frame memory 21₁To GOB with GN of 9
Header, frame memory 21 ₃From GOB with a GN of 3
Contents, frame memory 21₁To GOB with GN of 10
Frame memory 21_FourTo GOB with GN of 3
Y, frame memory 21₁To 11 GOB heads with GN
Frame memory 21₃To GOB with GN of 5
Y, frame memory 21₁To 12 GOB heads
Frame memory 21_FourTo the content of GOB with GN of 5
Read in the order of, and then read these repeatedly in the same order.
To stick out. The video signal created by the result of this reading
When the number is displayed, the screen shown in FIG. 8 is displayed.

When the number of GOBs to be combined is less than 12, it is sufficient to read only the GOB headers from the frame memory 21 ₁ for insufficient GOBs. In the above, GO
The B header may be read from a frame memory other than the frame memory 21 ₁ . Also, GN and G of GOB header
When the GN of the OB content is different, the GOB header may be read from the same frame memory or from different frame memories. If the headers of the video signals to be combined are matched in advance, there is no problem with signal consistency.

Also in the case of synthesizing in MB units, similarly, each header and the contents attached to the header are appropriately combined and sequentially read from each frame memory 21, so that a synthesized video signal can be obtained. In this case, it is necessary to use the header detection unit 19 to detect the timing of the beginning and end of the MB header.

With respect to the QCIF video signal, the composite video signal can be created by writing and reading the frame memory 21 by the same method. If the frame memory 21 is a memory capable of writing and reading at the same time, it is sufficient if each has a capacity of one screen, but if a memory that cannot perform writing and reading at the same time is used, it has two screens each. Or, the capacity for 3 screens is required.

The above-described screen synthesis can be performed on an arbitrary video signal for a video signal encoded without motion compensation, but a video image encoded with motion compensation is used. In the case of a signal, it is generally difficult because the relationship of motion compensation does not match between MBs that are in contact with each other at the boundary of the combined portion. The case where the present invention is effective even when there is motion compensation will be described below.

As is clear from the description given prior to the description of the embodiments of the present invention, the video signal coded by QCIF has a GOB of 1/4 of the video signal coded by CIF.
And the GN of the GOB that composes the video signal encoded by QCIF is the same as the GN of the GOB in the upper left quarter of the screen of the GOB that composes the video signal encoded by CIF. .

By utilizing this feature, the source format of the video signal coded by QCIF is changed to the information corresponding to CIF, so that the video signal whose vertical and horizontal dimensions are reduced to 1/2 can be obtained. This video signal has a GN of 1, 3, 5
Since there is a signal only in the GOB of the above, the signal is not completed as a CIF, but G is insufficient for the GOB.
A completed CIF video signal can be obtained by adding the OB header and the MB header as dummy signals.

The CIF video signal thus obtained becomes a video signal which can be reduced and displayed in the upper left ¼ portion of the screen, but is ¼ of the screen where the video data exists. Since the part is originally a video signal encoded by QCIF, the outermost MB is motion compensated so as not to affect the outside. That is, there is no relationship of motion compensation between the upper right ¼ video part and the lower left ¼ video part. Furthermore, the GN of the reduced video signal obtained by changing the source format is changed from 1, 3, 5 to
For example, if you change to 2, 4, 6 and move or copy to the upper right quarter, the upper left quarter and lower right 1
Since there is no motion compensation relationship with the / 4 part, no abnormality occurs. Upper right 1 created by moving or copying the reduced video signal obtained by changing the source format and the reduced video signal obtained by changing the source format
/ 4, lower left 1/4, lower right 1/4, even if a combined screen is created by combining the video signals corresponding to each part, each 1
At the boundary of the / 4 portion, independent video signals having no mutual motion compensation relationship are present, and no abnormality occurs.

If the video data amount increases and exceeds the specified value only by combining, the control unit 23 decreases the number of frames and reads from the frame memory 21 so that the data amount becomes equal to or less than the specified value. Take control.

In the above, CCITT Recommendation H.264. 26
Although the present invention has been described in the context of a video signal encoded by an H.1-compliant encoder, H.264. The present invention can be applied to other methods as long as the method is such that the screen is divided in the same manner as 261 and the information for identifying the position of the division unit is added. In that case, CIF, QC
Terms such as IF, GOB, and MB may be read as the corresponding terms in the system and applied.

[0053]

As is apparent from the above description, in the method of the present invention, it is not necessary to perform decoding in order to synthesize the video signals encoded by the encoding device, and the processing of the video data itself is performed. It doesn't need anything at all, it just changes the ordering information in the header. Therefore, there is an advantage that the quality of the image does not deteriorate due to the combination. Since the combined signal is in a coded state, there is also an advantage that no equipment for re-encoding is required when transmitting the combined signal to a remote place. Further, since the combined signal can be obtained by simply changing the order of the signals, the present invention can be easily implemented.

[Brief description of drawings]

FIG. 1 is a schematic explanatory diagram of the present invention.

FIG. 2 is a relationship diagram of a screen position and GOB for explaining an embodiment of the present invention.

FIG. 3 is a diagram showing an example of a screen combined by the composite screen creating method of the present invention.

FIG. 4 is a diagram showing an example of a screen combined by the composite screen creating method of the present invention.

FIG. 5 is a flowchart showing an example of a processing procedure of extracting and combining six GOBs from each video signal.

FIG. 6 is a diagram showing the relationship between the screen position and GOB for explaining the embodiment of the present invention.

FIG. 7 is a diagram showing an example of a screen combined by the composite screen creating method of the present invention.

FIG. 8 is a diagram showing an example of a screen combined by the composite screen creating method of the present invention.

FIG. 9 is a diagram showing an example of a screen combined by the composite screen creating method of the present invention.

FIG. 10 is a flowchart showing an example of a processing procedure for composing one screen by combining upper left quarters of three screens.

FIG. 11 is a block diagram of an example of an apparatus for implementing the composite screen creation method of the present invention.

FIG. 12 CCITT Recommendation H.264. It is a frame block diagram of the signal encoded by the H.261 compliant codec.

FIG. 13 is a diagram showing how a screen is divided in the case of CIF.

FIG. 14 is a diagram showing how a screen is divided in the case of QCIF.

FIG. 15 is a diagram showing how GOB is divided into MBs.

[Explanation of symbols]

 101,102 Screens to be combined 111,112 Encoding processing 121,122 Division unit extraction processing 131,132 Display position adjustment processing 140 Combining processing 150 Combining screens X1, X2, ..., Y1, Y2, ... Division unit

Claims (2)

[Claims] 1. A plurality of video signals are encoded by an encoding method in which a screen is divided by a predetermined division unit and an image portion of the division unit is encoded so that it is composed of a predetermined number of pixels. A single or a plurality of division units are extracted from each one of the video signals, and the position information in the header information of the division units is adjusted so as to represent the desired display position of the screen to be combined. A method for creating a composite screen, characterized in that the division units extracted for each one of the signals are combined and arranged in the order of the position information to create one video signal. 2. A plurality of video signals are encoded by an encoding method in which a screen is divided by a predetermined division unit and an image portion of the division unit is encoded so that it is composed of a predetermined number of pixels. A single or a plurality of division units are extracted from each one of the video signals, and the position information in the header information of the division units is adjusted so as to represent the desired display position of the screen to be combined. The division units extracted for each one of the signals are combined, and when the number of the extracted division units is less than the predetermined number, the insufficient division units are added by a dummy signal to obtain the position information. A synthetic screen creating method characterized by arranging in order to create one video signal.