JPH11112569A - Data transfer system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To keep reception data rate constant by dividing information so that duplicate information are not included, generating plural pieces of partial data, giving identifiers corresponding to the data and transmitting them while keeping transmission rate for every partial data constant and permitting a data reception device to input the acquirement object range within a desired range and to give an instruction for receiving the identifier within the range by a packet transmission/reception means. SOLUTION: A data input means 101 receives the input of data stream. A data division means 103 converts data if need in accordance with data division reference, divides information so that overlapped information are not contained, divides them into plural pieces of partial data and outputs them. The data division means 103 executes hierarchy division for generating basic data being data of lowest resolution, first differential data being a difference between basic data and data of second resolution and data to N-differential data as partial data by using a hierarchy division means 102. An acquirement object instruction means 208 instructs the reception of the identifier in the acquirement object range to a packet transmission/reception means 202.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to multimedia data in which a multimedia data stream is transferred over a network and a plurality of terminals output the multimedia data stream at a desired frame rate, resolution, importance, or screen area. The present invention relates to a stream transfer system.

[0002]

2. Description of the Related Art As a technique for distributing data to a plurality of terminals at different resolutions and importance levels, an information transfer method disclosed in JP-A-8-251178 is known as a conventional technique (1). In this method, the transmitting apparatus decomposes information to be transmitted into high-priority main information and differential information for restoring the original information from the main information, and transmits each with a different identification number. Depending on the processing capacity of the device and the load on the network, the receiving device can limit the type of identification number of the received packet to reduce the number of packets received, or send the packet to the transmitting device Is instructed to reduce the number of packets to be transmitted by limiting the type of the identification number. FIG. 14 shows a configuration diagram in which this information transmission method operates. 400 is a transmitting terminal, 500 is a receiving terminal, 600 is a network connecting the transmitting terminal and the receiving terminal, 401 is a virtual channel for transferring main information, 402
Is a virtual channel for transferring the difference information, 501 is a traffic measuring unit for detecting the traffic amount of the received information and the load state of the receiving terminal, and 502 is a control signal for instructing to stop receiving the difference information. The transmission terminal 400 divides the information to be transmitted into difference information between the main information and the rest,
The transmission is carried on a packet having a different identification number, and the receiving terminal 500 restricts the type of the identification number of the packet to be received in accordance with the current processing capacity according to the measurement result of the traffic measurement unit 501 to suppress the amount of information, If necessary, difference information is created by complementing the main information, enabling real-time information transfer. With this configuration, information transfer can be performed in real time and processing such as display can be performed on the receiving terminal even when network traffic or the processing capability of the receiving terminal changes.

A method of dividing image data into main information and difference information so that image data can be transmitted and received at a low resolution and a high resolution in the prior art (1) will be described with reference to FIG. The circles in FIG. 15 indicate pixels, and one black circle pixel 151 for every four pixels is main information, and two hatched circle pixels 152 and 153 are four pieces of difference information (high priority) for every four pixels. And one white circle pixel 154 for every four pixels is transmitted as difference information (low priority). The receiving terminal can receive a low-resolution image by receiving only the main information, and can receive a high-resolution image by receiving the main information and the difference information.

Further, as a conventional technique (2), 1991
IEICE Autumn Meeting B-330 “B-ISDN”
Hierarchical Coding for Comprehensive Information Services "
As for the “layering on the space axis” and the “layering on the time axis”, there is a method in which “the upper layer includes only the incremental information of the lower layer”. "Hierarchy on the spatial axis" is a conventional technology (1)
The image data is divided into main information and difference information so that the image data can be transmitted and received at a low resolution and a high resolution.
The “layering on the time axis” corresponds to the layering of the frame rate, which is a method of layering the main information and the difference information in frame units. The frame rate in each layer is such that it is easy to receive frames at equal intervals, for example, receiving one frame out of two frames or receiving one frame out of three frames. Also, it is desirable that the load of the receiving process can be averaged. The layering of the frame rate will be described with reference to FIG. FIG. 16 shows 30 frames per second as shown in FIG. 16A and the first frame as identification number 1 as shown in FIG.
The sixteenth frame is identified by identification number 2,
The 26th frame is transferred with the identification number 3 and the remaining frames are transferred with the identification number 4. This enables reception at four types of frame rates by setting the identification number to be received as described below.

Receiving identification number 1: 1 sheet per second (1 sheet for every 30) Receiving identification numbers 1 and 2: 2 sheets per second (1 sheet for every 15 sheets) Receiving identification numbers 1, 2 and 3: 6 per second Number of sheets (one for every five) Receives identification numbers 1, 2, 3, and 4: 30 frames per second When hierarchizing 30 frames per second, other 1, 2, 10, 30 frames per second, Or 1,5 per second
The correspondence between frames and identification numbers can be determined so that four types of frame rates such as 15, 30 frames can be obtained.

Next, the data rates in transmission and reception will be described. The data rate is the amount of data per unit time. This will be described with reference to FIG. In this example, the time from time t1 to time t5 is defined as T time, and the period T
The four frames included in each frame are hierarchically divided as the first as the basic data 173, the third as the first difference data 174, and the second and fourth as the second difference data 175,
Transmission is performed using different identifiers, and reception is possible at three frame rates. The data transmission speed is such that frame data V1, V2, V3,
.. Are input at times t1, t2, t3,... Before the next frame is input, as shown at 172, so that the data rate becomes a constant value R.
In this case, the transmission data rate to the network is constant, and when the data receiving apparatus receives the data of the highest frame rate, the packet reception timing becomes 172 and the reception data rate becomes a constant value R. Become.
However, when receiving at a low frame rate,
The data reception speed is not constant. For example, when receiving at the lowest frame rate, the average data rate is R /
4, but the data rate during the first T / 4 hour of the cycle T is R, and at other times it is 0. In such a case, even a data receiving device that receives data at a low frame rate requires R for the data receiving capability.

[0007]

In the prior arts (1) and (2) described above, first, the timing of transmitting the main data and the packet of the difference data is not described. When receiving low-resolution or high-priority data, there has been a problem that the reception data rate is not constant. For example, when hierarchization is performed at the frame rate, the reception data rate at the lowest frame rate is lower than the reception data rate at the highest frame rate in a long-term average, but is instantaneously reduced to the reception data rate at the highest frame rate. Will be equal. In such a data transmission method, there is a problem that a terminal having a low capacity cannot receive even data having the lowest frame rate.

[0008] Second, in the frame rate hierarchization method for performing hierarchies such that "the upper layer includes only the lower layer incremental information" described in the prior art (2), the types of frame rates that can be received are different. There was a problem that there was little. For example, when 30 frames per second are hierarchized, four types of frame rates can be supported, but it is not possible to support various frame rates.

Third, in the conventional techniques (1) and (2),
If only a part of the screen of the image data is to be displayed, the entire screen must be received, cut out and displayed, and there is a problem that a large amount of data must be received.

[0010] In order to solve these problems, the present invention firstly proposes a method for multimedia data so that the reception data rate is kept constant even in a terminal receiving data of high importance or low resolution. It is an object of the present invention to provide a multimedia data transfer system capable of transmitting a multimedia data.

Second, in the transmission of moving picture data, multimedia data that can be transmitted at a frame rate of M types by transmitting N frames having a period T with N identifiers, which are a submultiple of N, are transmitted. It is intended to provide a transfer system.

Third, it is an object of the present invention to provide a multimedia data transfer system capable of transmitting image data so as to reduce the amount of data to be received when a part of a screen is desired.

[0013]

In order to achieve the above object, the present invention firstly provides a data transfer system in which a data transmitting device and a data receiving device are connected to a network, wherein the data transmitting device comprises: Input means and part-
An identifier correspondence unit, a data division unit, a data transmission control unit, and a packet transmission / reception unit, wherein the data input unit inputs multimedia data, and the data division unit divides the input data by data division. According to the standard, if necessary, conversion is performed, and a plurality of partial data are generated by dividing so as not to include duplicate information.
The identifier correspondence means gives an identifier corresponding to each of the partial data generated by the data dividing means, and the data transmission control means sends the packet transmission / reception means to the packet transmitting / receiving means so that the transmission data rate for each partial data is constant. A constant-speed transmission control unit for instructing transmission is provided, a packet is generated by dividing each of the partial data output by the data dividing unit, and an identifier corresponding to each of the partial data is obtained from the partial-identifier correspondence unit. And using the identifier to instruct the packet transmission / reception unit to transmit a packet. The packet transmission / reception unit transmits / receives a packet to / from the network, and the packet generated by the data transmission control unit includes The transmission is performed by adding the specified identifier, and the data receiving apparatus includes:
A range-identifier correspondence unit, a packet transmission / reception unit, an acquisition target range instruction unit, a data reception control unit, a data synthesis unit, and a data output unit, wherein the acquisition target range instruction unit is an apparatus or a user. From the receiving side destination, a desired range, which is a desired range, is input, an identifier for receiving data of the range to be obtained is obtained from the range-identifier correspondence unit, and is received by the packet transmitting / receiving unit. And the range-identifier correspondence unit gives an identifier corresponding to an arbitrary target range, the packet transmission / reception unit transmits / receives a packet to / from the network, and the identifier specified by the acquisition target range designation unit And the data reception control means generates and outputs partial data from the packet received by the packet transmission / reception means. The data synthesizing unit synthesizes and outputs the data of the acquisition target range from the partial data output by the data reception control unit, and the data output unit outputs the synthesized multimedia data to a receiving side destination Output to

Thus, a multimedia data transfer system that can transmit multimedia data so that the reception data rate is constant even if the terminal is receiving data with high importance or low resolution is obtained.

Secondly, in the data transmission device according to the first invention, instead of or in addition to the constant-speed transmission control means, the data division means further includes a multi-frame rate division means, For a certain media having a moving image composed of frames, the multi-frame rate dividing means can be used to receive N frames included in a certain period T at a frame rate corresponding to a divisor of N. In the data receiving apparatus, the acquisition target range instructing means performs a multi-frame rate division for classifying the data into M types and generating M partial data. A frame rate is input, and an identifier corresponding to a frame necessary to obtain a frame rate of the acquisition target range is entered in the range-identifier correspondence method. The range-identifier correspondence means gives the identifier corresponding to the designated frame rate to the medium which performs the multi-frame rate division, and gives the data synthesis means the multi-frame rate division For the media that performs the above, the frames of the partial data are synthesized in time series to generate moving image data having a frame rate in the acquisition target range.

Thus, in the transmission of moving image data,
A multimedia data transfer system can be obtained in which N identifiers are added to N frames with a period T and transmitted, and reception is possible at M frame rates corresponding to a divisor of N.

According to a third aspect of the present invention, in the first aspect of the invention, in the first aspect of the invention, in the data transmission device, the data dividing means comprises:
The apparatus further includes a screen region dividing unit, and divides a screen into a plurality of regions by using the screen region dividing unit with respect to a certain medium including a screen such as a moving image or a still image in the input multimedia data. The screen receiving area is divided to generate partial data, and in the data receiving apparatus, the acquisition target range instructing means inputs a screen area as an acquisition target range for the medium on which the screen area is divided, and An identifier for receiving the partial data constituting the screen area is obtained from the range-identifier correspondence means, and instructed to be received by the packet transmission / reception means. The
An identifier corresponding to an arbitrary screen area is given, and the data synthesizing means further includes a screen area synthesizing means. Then, the data of the screen area in the acquisition target range is generated by combining the obtained areas.

Thus, a multimedia data transfer system capable of transmitting image data so as to reduce the amount of data to be received when a part of the screen is desired is obtained.

[0019]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The present invention is not limited to these embodiments at all, and can be implemented in various modes without departing from the gist thereof.

(Embodiment 1) According to the first invention,
The first embodiment will be described with reference to FIGS. FIG. 1 is a configuration diagram of the first embodiment.

As shown in FIG. 1, in this system, a data transmitting apparatus 100 and a plurality of data receiving apparatuses 200 are connected via a network 300. Data transmission device 1
00 is a data input unit 101 and a hierarchical division unit 10
2; a data transmission control means 105 having a constant speed transmission control means 104; a packet transmission / reception means 107; and a partial-identifier correspondence means 106.

The data receiving apparatus 200 includes a packet transmitting / receiving means 202 having a reception identifier limiting means 201, a data reception control means 203, a data synthesizing means 205 having a hierarchical synthesizing means 204, a data output means 206,
It comprises an acquisition target range designating unit 208 and a range-identifier correspondence unit 207.

The operation of the data transmission device 100 will be described.
The data input unit 101 receives an input of a data stream. Next, the data division unit 103 performs conversion if necessary according to the data division criterion, divides the data so as not to include redundant information, and divides the data into a plurality of partial data to output. In the present embodiment, the data dividing means 103 uses the hierarchical dividing means 102 included in the data dividing means 103 to convert the basic data which is the lowest resolution data and the first difference data which is the difference between the basic data and the data having the second resolution. And the second and third
Second difference data which is a difference between the data of the second resolution,
Similarly, hierarchical division is performed to generate up to the N-th difference data as partial data.

Next, an example of hierarchical division is shown in FIG. FIG. 2 shows an example in which the video media data stream 20 is divided into layers. The video media data stream 20 is divided into a video basic data stream 21, a video first difference data stream 22, and a video second difference data stream 23. Here, hierarchization is performed on the time axis, and division is performed so that the frame rate can be variably received in three stages. The data transmission control means 105 divides the partial data received from the data dividing means 103 into a plurality of packets, and adds information indicating the type of the partial data and the order in the partial data to each packet. Next, an identifier corresponding to each of the partial data is obtained from the partial-identifier correspondence means 106, and the packet transmission means 10
7 and instructs the packet to be transmitted using the corresponding identifier.

FIG. 3 is a diagram showing an example of the correspondence between the partial data and the identifier. As shown in FIG.
Give the identifiers corresponding to the two partial data. The packet transmission / reception unit 107 transmits the packet passed from the data transmission control unit 105 to the network 300 using the specified identifier.

Further, in the embodiment of the present invention, the transmission speed of each partial data is made constant by using the constant speed transmission control means 104. This operation will be described with reference to FIG. In this figure, the data is divided into layers according to the frame rate, and the frame data V1, V2, V3,.
Times t1, t2, t3,.
, And a period T from time t1 to t5 is set as a cycle, and the first frame in four frames included in each cycle T
The third is the basic data 41 and the third is the first difference data 4
The second, the fourth and the fourth are divided into layers in the second difference data 43, transmitted using different identifiers, and can be received at three frame rates. Assuming that the average data rate when all data is transmitted is R, the basic data 41 and the first differential data 42 have a data rate of R / R so that the data rate of each partial data is constant.
4. The second difference data 43 is set to the data rate R / 2. By keeping the transmission data rate of each partial data constant in this way, the reception data rate can be averaged to the following values.

Frame rate 1 / T (basic data): R / 4 Frame rate 2 / T (basic data + first difference): R / 2 Frame rate 4 / T (all data received): R By making the transmission speed of each partial data constant by using the high-speed transmission control means 104, the reception performance becomes R
Data receiving device with a frame rate of 4 /
T, video data having a frame rate of 2 / T can be received.

Next, the operation of the data receiving apparatus 200 will be described. The acquisition target range instructing unit 208 receives an acquisition target range, which is a range to be received, from a user on the receiving side or a receiving destination, which is an output destination device, and responds to the acquisition target range from the range-identifier correspondence unit 207. After obtaining the identifier, it instructs the packet transmitting / receiving means 202 to receive the packet of the identifier corresponding to the acquisition target range.

The range-identifier correspondence unit 207 stores a correspondence between an acquisition target range (here, resolution) and an identifier as shown in FIG. The packet transmission / reception unit 202 receives the instruction of the identifier received from the acquisition target range instruction unit 208,
It is passed to the reception identifier restricting means 201. The reception identifier limiting unit 201 controls the packet transmission / reception unit 202 to receive a packet having the specified identifier in addition to the packet addressed to the own address. Data reception control means 203
Receives the packet from the packet transmitting / receiving means 202, combines the partial data according to the type of the partial data included in the attribute information of the packet, and the order information, generates and outputs the original partial data. Data synthesis means 205
Receives the partial data from the data reception control means 203 and combines them using the hierarchical composition means 204. The hierarchical composition means 204 composes data at a predetermined stage from the basic data and the difference data.

FIG. 6 shows an example of multimedia data stream generation. In this example, the reception resolution is the video second resolution. Video basic data stream 61 and video first
A data stream 60 of the video second resolution is synthesized from the difference data stream 62. The data output means 205
The multimedia data generated by the media synthesizing unit 205 is output to the receiving destination. The output destination is a decoder, a storage device, or the like, and the decoder may be realized only by software, or may be hardware and driver software.

As a network, LAN, ATM,
IEEE1394 or the like can be used. For example, when IP is used as a network protocol, IP multicast can be used as a multicast means, and a multicast address using a class D of an IP address corresponds to an identifier. Such as devices and software.

Network: Ethernet Packet transmission / reception means: Ethernet communication board, driver software, and IP protocol stack A function corresponding to reception identifier restriction means for controlling reception of a packet having a plurality of designated IP multicast addresses as destinations. . In addition, AT
When M is used, the identifier corresponds to VCI and VPI, and when IEEE1394 is used for the network, the identifier corresponds to the channel number.

The multimedia data stream may be composed of a plurality of videos and audios, and may be composed of texts, images, display positions and display timings of respective media in addition to audios and videos. . As an example of hierarchical division, in the case of MPEG video,
I-frame data is divided into a basic data stream, P-frame data is divided into a first differential data stream, and B-frame data is divided into a second differential data stream. "2 from audio with a sampling rate of 11 KHz
Difference data from audio at 2 kHz sampling rate ”,“ 4
4KHz sampling rate differential data to audio "
Or "monaural sound", "differential data for converting monaural sound into stereo sound", "8-bit sound", "from 8-bit sound to 16-bit sound". Differential data ”,“ Differential data from 16-bit audio to 32-bit audio ”, segmentation like pitch, sound quality, text (text)
In the case of data, it can be divided into headings, texts, and annotations.

The following hierarchical division may be combined. For example, “22 KHz · 16 bits”, “22 KHz · 16 bits to 22 KHz · 32 bits”
Difference to bits "," 22KHz, 16 bits to 44
Difference to KHz · 16 bits ”,“ ｛22 KHz · 16
Difference from bit to 22KHz / 32 bit｝ to ｛4
By generating “difference from ・ from 4 KHz · 16 bits to 44 KHz · 32 bits｝”, “22 KHz
16 bits, 44 KHz 16 bits, 22 bits
KHz 32 bits "and" 44 KHz 32 bits "can be received.

In the present system, the input source of the multimedia data of the data transmitting apparatus may be any one that outputs multimedia data such as a video camera, a video tape player, a storage means such as a hard disk, and a data reading mechanism. The output destination of the multimedia data of the data receiving device is provided with a mechanism for decoding video and audio and a display and a speaker as a display / playback destination, which are provided to the user or stored in a storage means such as a hard disk. Any device that receives multimedia data may be used, and the designation of the acquisition target in the acquisition target range means may be specified from the keyboard by the user on the receiving side,
If there is a designation from the device to which the multimedia data is output, or if there is no designation, the operation may be performed in some fixed acquisition target range. The data transmitting device and the multimedia data input source (or the data receiving device and the multimedia data output destination) may be realized by different devices connected via a network, or may be realized as one device such as a personal computer. .

As described above, in the present embodiment, the data transmission apparatus 100 is provided with the constant-speed transmission control means 104 in the data transmission control means 105, and the data transmission for each of the partial data is set to a constant speed. Multimedia data can be transmitted so that even low-performance terminals or basic data with low resolution can be received by terminals with low capabilities.
Its practical effect is great.

(Embodiment 2) Next, a second embodiment corresponding to the second invention will be described with reference to FIGS. FIG. 7 is a configuration diagram of the second embodiment.

As shown in FIG. 7, in this system, a data transmitting apparatus 100 and a plurality of data receiving apparatuses 200 are connected to a network 300. Data transmission device 100
Includes a data input unit 101, a data division unit 103 having a multi-frame rate division unit 108, a data transmission control unit 105, a packet transmission / reception unit 107,
It comprises a part-identifier correspondence means 106. The data receiving device 200 includes a packet transmitting / receiving unit 202 having a reception identifier limiting unit 201 and a data receiving control unit 203
, Data synthesizing means 205 and data output means 206
And an acquisition target range designating unit 208 and a range-identifier correspondence unit 207.

In the present embodiment, in the transmission of video data, the data transmitting device transmits N frames with a period T
By providing M identifiers corresponding to a divisor of N and transmitting the data, the data receiving apparatus can receive data at M kinds of frame rates during the period T.

The operation of data transmitting apparatus 100 is the same as that of the first embodiment except for the operation of data dividing means 103.
The data dividing means 103 divides the N pieces of frame data for each cycle T into M types by using the multi-frame rate Performs multi-frame rate division to divide into data.

The operation of data receiving apparatus 200 is the same as that of the first embodiment. However, the acquisition target range instructing unit 208 inputs the frame rate as the acquisition target range for a medium to be subjected to multi-frame rate division. In addition, the range-identifier correspondence unit 207 gives an identifier corresponding to the frame rate to the medium that performs the multi-frame rate division. When N = 12, the range-identifier correspondence unit 207 stores the correspondence between the frame rate and the identifier as shown in FIG.

Next, multi-frame rate division will be described.
I will explain in detail. Multi-frame rate dividing means 1
08, N frames of period T (frame numbers in order)
No. 1 to N), the divisor of N is R = ｛r₁,
r_Two, ..., r _MIf there are M pieces of｝, there are M types of frames
And generate partial data. Frame number n frame
Is the largest element among the elements of R contained in the divisor of n
To r_kThen, it is divided into the k-th type. In this embodiment
Is obtained by the part-identifier correspondence means 106 as described above.
The identifier corresponding to the frame number is stored.

The case where N = 12 will be described as an example. here,
It is assumed that the k-th type of partial data is transmitted using the identifier k. Since the divisor R of N = 12 is R = {1, 2, 3, 4, 6, 12}, r ₁ = 1, r ₂ = 2, r ₃ = 3, r ₄ = 4, r
₅ = 6 and r ₆ = 12. For example, in the frame of frame number 10, the divisor of n = 10 is {1, 2, 5, 10} where R is {r ₁ = 1, r ₂ = 2}, so the largest element is r ₂ = 2 , And is transmitted using the identifier 2 because it is the second element of R. Hereinafter, identifiers of frame numbers 1 to 12 are as follows. (Frame number n, divisor of n, element r _k of maximum R including, identifier k) 1: {1}: r ₁ = 1 k = 1 2: {1,2}: r ₂ = 2 k = 2 3: {1,3}: r ₃ = 3 k = 3 4: {1,2,4}: r ₄ = 4 k = 4 5: {1,5}: r ₁ = 1 k = 1 6: ｛ _{1,2,3,6}: r 5 = 6 k} = 5 7: {1,7}: r 1 = 1 k = 1 8: {1,2,4,8}: r 4 = 4 k = 4 _{9: {1,3,9}: r 3} = 3 k = 3 10: {1,2,5,10}: r 2 = 2 k = 2 11: {1,11}: r 1 = 1 k = 1 12: {1,2,3,4,6,12}: r ₆ = 12 k = 6 FIG. 9A shows the correspondence between the above-mentioned frames and identifiers.

The data divided at the multi-frame rate as described above has a period T
Can be received at a frame rate of an arbitrary number S of frames. The identifier corresponds to the j-th type identifier for all r _j that are divisors of S. Correspondence of frame rate and identifier determined in this manner Range-identifier correspondence means 2 of data receiving apparatus 200
07 is stored.

The case where N = 12 will be described as an example. N = 12
Are {1, 2, 3, 4, 6, 12}, so that reception at six types of frame rates is possible. If the frame rate is S = 6 frames during the period T, the divisor of S is {1, 2, 3, 6},
The corresponding rj is ｛r ₁ = 1, r ₂ = 2, r ₃ = 3, r ₅ =
6}, which corresponds to the first, second, third and fifth elements of R, and the received identifier is {1, 2, 3, 5}. Hereinafter, identifiers corresponding to the six types of frame rates are as follows. (Frame rate S / T, divisor of S,
R elements rk, identifier k) 1 / T: {1 }: r 1: 1 2 / T: {1,2}: r 1, r 2: 1,2 3 / T: {1,3}: r ₁ , r ₃ : 1,3 4 / T: {1,2,4}: r ₁ , r ₂ , r ₄ : 1,2,4 6 / T: {1,2,3,6}: r ₁ , r ₂ , r ₃ , r ₅ : 1,2,3,5 12 / T: {1,2,3,4,6,12}: r ₁ , r ₂ , r ₃ , r ₄ , r ₅ , r ₆ : 1,2,3,4,5,6 The correspondence between the above frame rates and identifiers is shown in FIG.

As described above, in the present embodiment, in the transfer of moving image data, the data transmitting apparatus transfers data frames to N frames of the period T without overlapping, thereby reducing the load on the network. To reduce
In addition, the data receiving apparatus can combine a plurality of data to receive a transfer rate corresponding to a divisor of the transfer rate, which has a large practical effect. In this embodiment, the data transfer is divided into multi-channels. However, in the case of outputting from a file storing video information,
The same effect can be obtained by dividing into files in which the frame rate to be stored is specified by the above-mentioned dividing method.

(Embodiment 3) Finally, a third embodiment corresponding to the third invention will be described with reference to FIGS.
This will be described with reference to FIG. FIG. 10 is a configuration diagram of a third embodiment of the present system.

As shown in FIG. 10, in this system, a data transmitting apparatus 100 and a plurality of data receiving apparatuses 200 are connected to a network 300. Data transmission device 100
Are data input means 101 and screen area dividing means 109
, A data transmission control means 105, a packet transmission / reception means 107, and a part-identifier correspondence means 106.

Data receiving apparatus 200 includes packet transmitting / receiving means 202 having reception identifier limiting means 201, data reception control means 203, data combining means 205 having screen area combining means 209, and data output means 206.
And an acquisition target range designating unit 208 and a range-identifier correspondence unit 207.

In the present embodiment, when transferring video data and still image data, the data transmitting apparatus 100
By dividing the screen into regions and sending the divided regions using different identifiers, the data receiving device can transmit video data of a desired region,
Still image data can be received.

Next, the operation of the present system will be described. The operation of the data transmitting apparatus 100 is performed by
Operations other than 03 are the same as those in the first embodiment. The data dividing unit 103 divides a screen into a plurality of regions by using a screen region dividing unit 109 for media of video data and still image data to generate partial data. For example, the screen area is divided into N equally in the vertical direction, M equally in the horizontal direction, and N × M
It is assumed to be divided into a plurality of regions. Packet transmitting / receiving means 1
Reference numeral 07 sends the partial data divided by the area division using different identifiers as in the first embodiment. FIG.
= 6, M = 6, indicating that the screen is divided into 36 equal parts and transmitted with 36 identifiers A1 to A36.

The operation of the data receiving apparatus 200 is the same as that of the first embodiment except for the operation of the data synthesizing means 205.
However, the acquisition target range instructing means 208 inputs a screen area as an acquisition target range, obtains an identifier for receiving the designated area from the range-identifier correspondence means 207, and instructs the packet transmitting / receiving means 202. . Here, the range-identifier correspondence unit 207 gives a correspondence which identifier should be received in order to receive which part of the screen. For example, in FIG.
Is input, the received identifiers are A1, A
2, A3, A4, A7, A8, A9, A10, A13,
A14, A15, A16, A19, A20, A21, A
The number of data becomes 22 and the 16 data is received.

Next, the data synthesizing means 205 performs the screen area using the screen area synthesizing means 209 when synthesizing the data of the divided media. In the example of FIG. 12, 16 pieces of partial data are screen-synthesized, and video data or still image data of the acquisition target range 120 is output.

In this embodiment, the screen is equally divided into N × M rectangles. However, the screen may be divided into a plurality of regions having different areas in different shapes, and one partial data may be divided into two regions. It may be composed of one or more regions. For example, as in a second example of the division of the screen area in FIG.
The region may be divided into a central region 1, a region 2 surrounding the region 1, and a region 3 surrounding the region 2. The format of the screen data may be an arbitrary format such as a bitmap format, MPEG, or DV.

In the present embodiment, the screen area synthesizing means synthesizes and outputs the screen of the area specified as the acquisition target range, but may synthesize and output all the received areas.

By using the present embodiment, it is possible to construct a system that transmits video data and allows a plurality of terminals to simultaneously perform pan / tilt / zoom operations. For example, a video camera is connected to the input source of the data transmission device. It is desirable to use a wide-angle lens for the video camera. In the data transmitting apparatus, for example, as described above, the video data from the video camera is divided into N × M areas and transmitted using different identifiers. The data receiving device decodes the video data at the output destination and displays it on the display. In addition, the pan / tilt / tele / wide operation from the user is accepted from the user,
User interface means for inputting to the acquisition range input means is provided. At first, the central part of the screen is input to the acquisition target range means as an acquisition target range, and pan /
When a tilt operation is received, the acquisition target range is changed to up, down, left, and right, and when a tele-wide operation is received, reduction and enlargement of the acquisition target range are instructed. By doing so, it is possible to provide an image to the user as if the user were performing a pan / tilt / tele / wide operation without actually moving the video camera. It is also possible for users of a plurality of terminals to perform different operations at the same time.

As described above, in the present embodiment, when transferring video data and still image data, the data transmitting device divides the screen into regions and transmits the divided regions using different identifiers. The data receiving device can receive and output video data and still image data of a desired area,
Its practical effect is great.

[0058]

As described above, according to the first aspect, even a terminal receiving data with high importance or low resolution can transmit multimedia data so that the reception data rate is constant. A multimedia data transfer system that can be provided.

According to the second aspect of the present invention, in the transmission of moving image data, multimedia which can be transmitted with N identifiers satisfying M <N added to N frames having a period T and transmitted at M frame rates A data transfer system can be provided.

According to the third aspect of the present invention, it is possible to provide a multimedia data transfer system capable of transmitting image data so as to reduce the amount of received data when a part of a screen is desired.

[Brief description of the drawings]

FIG. 1 is a configuration diagram illustrating an example of a data transfer system according to a first embodiment of the present invention;

FIG. 2 is a diagram showing an example of a data hierarchical division according to the first embodiment;

FIG. 3 is a diagram showing an example of a correspondence between partial data and an identifier;

FIG. 4 is a diagram showing an example of a mechanism in which the transmission speed of each partial data is constant.

FIG. 5 is a diagram showing an example of a correspondence between an acquisition target range and an identifier;

FIG. 6 shows an example of multimedia data stream generation.

FIG. 7 is a configuration diagram illustrating an example of a data transfer system according to a second embodiment of the present invention;

FIG. 8 is a diagram showing an example of a correspondence between a reception frame rate and a corresponding identifier;

FIG. 9 is a diagram illustrating an example of a correspondence between a frame rate, a transmission identifier, and a corresponding frame;

FIG. 10 is a configuration diagram illustrating an example of a data transfer system according to a third embodiment of the present invention.

FIG. 11 is a diagram showing an example of correspondence between partial data, which is a divided screen area, and its identifier;

FIG. 12 is a diagram illustrating an example of designation of a screen area when synthesizing data;

13 is a diagram showing an example other than the example of dividing the screen area shown in FIG. 11;

FIG. 14 is a diagram showing a configuration of a conventional information transmission.

FIG. 15 is a diagram showing a conventional division of main information and difference information.

FIG. 16 is a diagram showing a conventional frame rate hierarchy.

FIG. 17 is a diagram showing conventional frame data and its data speed.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 data transmission device 101 data input means 102 hierarchical division means 103 data division means 104 constant-speed transmission control means 105 data transmission control means 106 partial-identifier correspondence means 107 packet transmission / reception means 108 multi-frame rate division means 109 image area division means 200 Data receiving device 201 Reception identifier limiting means 202 Packet transmitting / receiving means 203 Data reception controlling means 204 Hierarchical combining means 205 Data combining means 206 Data output means 207 Range-identifier correspondence means 208 Acquisition target range designating means 300 Network

Claims (4)

[Claims] 1. A data transmitting device and a data receiving device, which can communicate with each other via a network or the like, wherein the data transmitting device includes a data input unit, a part-identifier correspondence unit, and a data division unit. Data transmission control means having constant-speed transmission control means, and a packet transmission / reception means, wherein the data input means inputs data, and the data division means does not include duplicate information of the input data. The partial-identifier correspondence means gives an identifier corresponding to each of the partial data generated by the data division means, and the data transmission control means Generating a packet by dividing each of the partial data output by the means;
Obtaining an identifier corresponding to each of the partial data from the partial-identifier correspondence means, instructing the packet transmission / reception means to transmit a packet using the identifier, and controlling the constant-speed transmission control means of the data transmission control means Instructs the packet transmission / reception means to transmit a packet so that the transmission data rate for each partial data becomes constant, the packet transmission / reception means transmits / receives a packet to / from the network, and the data transmission control means generates the packet. The packet is provided with the specified identifier and transmitted. The data receiving device includes a range-identifier corresponding unit, a packet transmitting / receiving unit, an acquisition target range indicating unit, a data reception control unit, and a data receiving unit. A combination unit and a data output unit, wherein the acquisition target range designating unit is a device or a user From the side use destination, input the acquisition range which is a desired range, instruct the packet transmission / reception unit to receive an identifier for receiving the data of the acquisition range from the range-identifier correspondence unit and receive the identifier. The range-identifier correspondence unit gives an identifier corresponding to an arbitrary target range, the packet transmission / reception unit transmits / receives a packet to / from the network, and transmits the packet of the identifier designated by the acquisition target range designation unit. Receiving, the data reception control means generates and outputs partial data from the packet received by the packet transmission / reception means, and the data synthesizing means obtains the acquired data from the partial data output by the data reception control means. The data in the target range is combined and output, and the data output means outputs the combined data to a receiving destination. To enter data in the data transmission apparatus, and transfers through the network,
A data transfer system, wherein the data receiving device receives at a constant speed. 2. A data transmission device and a data reception device, which can communicate with each other via a network or the like, wherein the data transmission device includes a data input unit, a partial-identifier correspondence unit, a data division unit. And a data transmission control means, and a packet transmission / reception means, wherein the data input means inputs data, and the data division means,
When the input data is a medium composed of frames, N frames included in a certain period T (in the order of frame numbers 1 to N) are represented by a positive divisor of N = R =
{R ₁ , r ₂ ,..., R _M } are classified into M types, and each frame is represented by a frame number n (1 ≦ n ≦
When the largest one of the Rs included in the divisor of N) is r _k , the data is divided into the k-th type to generate a plurality of partial data. The data transmission control unit divides each of the partial data output by the data division unit to generate a packet, and generates a packet from the partial-identifier correspondence unit. Obtaining an identifier corresponding to the partial data, instructing the packet transmission / reception means to transmit a packet using the identifier, the packet transmission / reception means transmitting / receiving a packet to / from the network, The packet generated by the control means is provided with the specified identifier and transmitted, and the data receiving apparatus includes a range-identifier Response means, packet transmission / reception means, acquisition target range indicating means, data reception control means, data synthesizing means, and data output means, wherein the acquisition target range indicating means performs a multi-frame rate division. In response, a frame rate is input as an acquisition target range, an identifier corresponding to a frame required to obtain the frame rate of the acquisition target range is obtained from the range-identifier correspondence unit, and transmitted to a packet transmitting / receiving unit, The range-identifier correspondence unit holds the correspondence of the transmission identifier to the frame rate, the packet transmission / reception unit transmits / receives a packet to / from the network, and receives the packet of the identifier designated by the acquisition target range designation unit. , The data reception control means,
From the packet received by the packet transmitting and receiving means, generates and outputs partial data, the data combining means generates moving image data having a frame rate of the acquisition target range by combining frames of the partial data in time series, The data output means outputs the combined data to a receiving destination.
A data transfer system, characterized in that: 3. In a data receiving apparatus, for a reception frame rate of S frames (S is a divisor of N) in a period T, a range-identifier correspondence unit performs a process for all r _j that are divisors of S. 3. The data transfer system according to claim 2, wherein an identifier of the j-th kind is associated. 4. A data transmission device and a data reception device, which can communicate with each other via a network or the like, wherein the data transmission device includes a data input unit, a part-identifier correspondence unit, and a data division unit. , A data transmission control unit, and a packet transmission / reception unit, wherein the data input unit inputs data, and the data division unit divides the input data so as not to include redundant information, and Generate partial data, for a certain media composed of a screen such as a moving image or a still image out of the input multimedia data, to generate a partial data by performing screen area division to divide the screen into a plurality of areas, The part-identifier correspondence means gives an identifier corresponding to each of the partial data generated by the data division means, and the data transmission control means Each of the partial data output by the data dividing means is divided to generate a packet, an identifier corresponding to each of the partial data is obtained from the partial-identifier correspondence means, and the packet transmission / reception means is used by using the identifier. The packet transmission / reception unit transmits / receives a packet to / from the network, and transmits the packet generated by the data transmission control unit by attaching the specified identifier to the packet. The data receiving apparatus includes a range-identifier correspondence unit, a packet transmission / reception unit, an acquisition target range instruction unit, a data reception control unit, a data synthesis unit, and a data output unit, and the acquisition target range Instructing means inputs a screen area as an acquisition target range for the medium for which the screen area is to be divided, and An identifier for receiving the partial data constituting the screen area of the range is obtained from the range-identifier correspondence means and instructed to be received by the packet transmission / reception means, and the range-identifier correspondence means is a medium for performing the screen area division. In response, an identifier corresponding to an arbitrary screen area is given, and the packet transmitting / receiving unit transmits / receives a packet to / from the network, and receives a packet of the identifier specified by the acquisition target range specifying unit. The packet transmission / reception unit is controlled, the data reception control unit generates and outputs partial data from the packet received by the packet transmission / reception unit, and the data combining unit transmits the partial data to the medium for performing the screen area division. Is
Data obtained by synthesizing the divided areas of the partial data to generate data of a screen area in the acquisition target range, wherein the data output means outputs the synthesized data to a destination on the receiving side. Transfer system.