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KR100251449B1 - Video data transmission system for video communication - Google Patents

Video data transmission system for video communication Download PDF

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Publication number
KR100251449B1
KR100251449B1 KR1019970027067A KR19970027067A KR100251449B1 KR 100251449 B1 KR100251449 B1 KR 100251449B1 KR 1019970027067 A KR1019970027067 A KR 1019970027067A KR 19970027067 A KR19970027067 A KR 19970027067A KR 100251449 B1 KR100251449 B1 KR 100251449B1
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video
buffer
frame
block
image data
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KR19990003239A (en
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하배영
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윤종용
삼성전자주식회사
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/025—Systems for the transmission of digital non-picture data, e.g. of text during the active part of a television frame

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  • Two-Way Televisions, Distribution Of Moving Picture Or The Like (AREA)

Abstract

PURPOSE: A video data transmission system for a video communication is provided to maximize the transmission efficiency according to a block transmission by separating one frame of video data as the unit of block, and to prevent a communication error by normally forming a video frame. CONSTITUTION: A video data transmission system is composed of a server(20) which connects a plurality of video communication terminals(10-1,10-2,---10-n) with video communication terminals(10-1,10-2,---10-n). The first video communication terminal(10-1) is equipped with a control unit(12) and a video signal processing unit(14). The control unit(12) operates a video communication program operates a video communication program. The video signal processing unit(14) encodes/decodes an input video signal inputted from a camera and an output video signal outputted to a monitor. The video signal processing unit(14) is equipped with two buffers(14-1,14-2) store video data received from another video communication terminals.

Description

영상통신을 위한 영상데이타 전송시스템Video data transmission system for video communication

본 발명은 컴퓨터통신의 영상데이타 전송시스템에 관한 것으로서, 특히 영상데이타의 각 프레임을 블록으로 분할하여 블록데이타를 전송하고, 각 프레임의 블록데이타들이 올바른 순서가 되도록 수신하여 전송시 발생하는 에러를 방지할 수 있는 영상데이타 전송시스템에 관한 것이다.The present invention relates to a video data transmission system of computer communication, and in particular, each frame of video data is divided into blocks to transmit block data, and the block data of each frame is received in a correct order to prevent an error occurring during transmission. The present invention relates to a video data transmission system.

일반적으로, 통신망을 이용하여 영상통신을 하는 경우, 영상프로그램이 기동되고 기동된 영상프로그램에 따라 영상데이타를 처리한다. 처리된 영상데이타는 통신망을 통해 프레임단위로 송/수신된다.In general, in the case of video communication using a communication network, a video program is started and processes the video data according to the started video program. The processed video data is transmitted / received frame by frame through the communication network.

그러나, 이러한 통신망을 이용하여 영상통신을 할 때, 영상데이타의 전송도중 영상통신단말들간의 전송속도의 차이 및 서버의 라우팅(louting)경로의 변환 등으로 인한 프레임데이타의 전송순서가 뒤바뀌는 경우가 발생할 수 있다. 이에 따라 통신에러가 발생할 수 있고, 영상 프레임의 잘못된 구성으로 인해 정상적인 화면이 디스플레이되지 않는 경우가 발생하는 문제점이 있었다.However, when performing video communication using such a communication network, the transmission order of frame data may be reversed due to a difference in transmission speed between video communication terminals and a change in routing path of a server during transmission of video data. Can be. Accordingly, a communication error may occur, and a normal screen may not be displayed due to an incorrect configuration of an image frame.

따라서, 본 발명의 목적은 위와같은 문제점을 해결하기 위해 영상데이타의 한 프레임을 블록단위로 분할하여 전송함으로써 블록전송으로 인한 전송효율을 극대화할 수 있고, 분할된 블록데이타들이 한 프레임을 구성하는 올바른 순서가 되도록 수신하여 영상 프레임을 정상적으로 구성함으로써 통신에러를 방지할 수 있는 영상데이타 전송시스템을 제공함에 있다.Accordingly, an object of the present invention is to maximize the transmission efficiency due to block transmission by dividing and transmitting one frame of image data in units of blocks to solve the above problems, and the divided block data constitute a correct frame. The present invention provides a video data transmission system capable of preventing a communication error by receiving an order and configuring a video frame normally.

제1도는 본 발명에 따른 영상통신을 위한 영상데이타 전송시스템을 나타내는 구성도.1 is a block diagram showing a video data transmission system for video communication according to the present invention.

제2도는 본 발명의 실시예에서 영상데이타 수신단으로 동작하는 제2영상통신단말(10-2)의 동작을 설명하기 위한 동작흐름도.2 is a flowchart illustrating an operation of a second video communication terminal 10-2 operating as a video data receiving terminal according to an embodiment of the present invention.

* 도면의 주요부분에 대한 부호의 설명* Explanation of symbols for main parts of the drawings

10-1, 10-2, …, 10-n : 영상통신단말 12, 16 : 제어부10-1, 10-2,... , 10-n: video communication terminal 12, 16: control unit

14, 18 : 영상신호처리부 14-1, 18-1 : 주버퍼14, 18: video signal processor 14-1, 18-1: main buffer

14-1, 18-2 : 보조버퍼 20 : 서버14-1, 18-2: auxiliary buffer 20: server

위와같은 목적을 달성하기 위한 본 발명의 특징은 영상통신시스템에 있어서, 제1버퍼 및 제2버퍼를 구비하며, 부호화된 프레임단위 영상데이타를 일정크기의 블록으로 나누어 각 블록단위 영상데이타에 프레임번호와 프레임내 블록번호를 포함하는 프레임정보를 부가하여 전송하고, 수신할 때 수신되는 블록데이타에 실린 프레임정보를 설정된 프레임정보와 비교하여 그에 따라 상기 버퍼들중 하나에 저장한 후 복호화하여 디스플레이하도록 하는 영상신호처리부를 포함하는 개인용 통신단말, 및 다수개의 개인용 통신단말들과 연결되어 상기 개인용 통신단말로부터 입력되는 영상데이타를 해당 개인용 통신단말로 전송하는 서버를 포함하는 것을 특징으로 하는 영상통신을 위한 영상데이타 전송시스템에 있다.A feature of the present invention for achieving the above object is a video communication system, comprising a first buffer and a second buffer, by dividing the coded frame unit image data into blocks of a predetermined size frame number in each block unit image data And frame information including a block number in a frame, and transmits, and compares the frame information contained in the received block data with the received frame data, stores it in one of the buffers, and decodes the displayed frame information accordingly. Personal communication terminal comprising a video signal processing unit, and a plurality of personal communication terminals connected to the video data input from the personal communication terminal comprising a server for video communication, characterized in that it comprises a personal communication terminal; It is in a data transmission system.

이하, 첨부한 도면들을 참조하여 본 발명의 바람직한 실시예를 상세히 기술하기로 한다.Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

제1도는 본 발명에 따른 화상통신을 위한 영상데이타 전송시스템의 구성도를 나타낸다. 제1도에 나타낸 영상데이타 전송시스템은 다수개의 영상통신단말들(10-1,10-2,…,10-n)과 영상통신단말들(10-2,10-2,…,10-n)간의 접속을 가능하게 하는 서버(20)로 구성된다. 제1영상통신단말(10-1)은 영상통신이 가능하도록 영상통신 프로그램을 기동하며 서버(20)와 접속하도록 제어하는 제어부(12)와, 카메라로부터 입력되는 입력영상신호 및 모니터로 출력되는 출력영상신호를 부호화/복호화하는 영상신호처리부(14)를 구비한다. 영상신호처리부(14)는 다른 영상통신단말로부터 수신되는 영상데이타를 저장하는 2개의 버퍼들(14-1,14-2)을 구비한다. 제1도의 영상통신단말들(10-1,10-2,…,10-n)의 구성은 서로 동일하므로, 다른 단말에 대한 설명은 생략하겠다.1 is a block diagram of a video data transmission system for video communication according to the present invention. The video data transmission system shown in FIG. 1 includes a plurality of video communication terminals 10-1, 10-2, ..., 10-n and video communication terminals 10-2, 10-2, ..., 10-n. Server 20 for enabling connection between The first video communication terminal 10-1 starts a video communication program to enable video communication, and controls the control unit 12 to connect to the server 20, an input video signal input from a camera, and an output output to a monitor. And a video signal processor 14 for encoding / decoding the video signal. The video signal processor 14 includes two buffers 14-1 and 14-2 for storing video data received from other video communication terminals. Since the configurations of the video communication terminals 10-1, 10-2,..., 10-n of FIG. 1 are the same, descriptions of other terminals will be omitted.

본 발명의 실시예로, 제1도에 도시된 제1 영상통신단말(10-1)과 제2 영상통신단말(10-2)간의 영상통신과정을 상세히 설명하겠다.As an embodiment of the present invention, a video communication process between the first video communication terminal 10-1 and the second video communication terminal 10-2 shown in FIG. 1 will be described in detail.

먼저, 제1영상통신단말(10-1)은 영상프로그램을 기동한다. 즉, 제어부(12)는 영상프로그램을 수행한다. 그리고, 제어부(12)는 서버(20)를 통해 다른 통신단말과 통신을 할 수 있도록 통신프로그램을 기동한다.First, the first video communication terminal 10-1 starts a video program. That is, the controller 12 performs an image program. Then, the control unit 12 activates a communication program so as to communicate with other communication terminals through the server 20.

영상통신을 하기 위해 영상신호처리부(14)는 카메라로부터 영상신호를 입력받는다. 영상신호처리부(14)는 입력되는 영상신호를 부호화하여 제어부(12)로 출력한다. 이때, 영상신호처리부(14)는 부호화된 프레임단위 영상데이타를 일정크기의 블록으로 분할한다. 영상신호처리부(14)는 분할된 각 블록단위 영상데이타에 프레임번호와 프레임내 블록번호 등을 부가하여 출력한다. 서버(20)는 제1영상통신단말(10-1)로부터 인가되는 블록데이타들을 제2영상통신단말(10-2)로 출력한다.In order to perform video communication, the image signal processor 14 receives an image signal from a camera. The video signal processor 14 encodes an input video signal and outputs the encoded video signal to the controller 12. At this time, the image signal processor 14 divides the encoded frame-based image data into blocks having a predetermined size. The video signal processor 14 adds a frame number and an intra-frame block number to each divided block unit image data and outputs the same. The server 20 outputs block data applied from the first video communication terminal 10-1 to the second video communication terminal 10-2.

제2도는 본 발명의 실시예에서 영상데이타 수신단으로 동작하는 제2영상통신단말(10-2)의 동작을 설명하기 위한 동작흐름도이다.2 is a flowchart illustrating an operation of the second video communication terminal 10-2 operating as a video data receiving terminal in the embodiment of the present invention.

제2영상통신단말(10-2)은 서버(20)를 통해 제1영상통신단말(10-1)로부터 전송되는 블록단위 영상데이타를 수신받는다. 제2 영상통신단말(10-2)의 제어부(16)는 주버퍼(18-1)의 현재 수신 프레임번호 및 블록번호를 설정한다(제210단계), 그런 다음, 제어부(16)는 주버퍼(18-1)에 설정한 프레임번호와 수신되는 블록단위 영상데이타의 프레임번호가 일치하는 지를 비교한다(제215단계). 제215단계의 비교결과 주버퍼(18-1)에 설정한 프레임번호와 수신되는 블록단위 영상데이타의 프레임번호가 일치하지 않으면, 제어부(16)는 그 블록단위 영상데이타를 주버퍼(18-1) 대신 보조버퍼(18-2)에 저장한다(제220단계). 제어부(16)는 수신되는 블록단위 영상데이타의 프레임번호가 현재 수신할 프레임번호의 다음번호일 때만 그 블록단위 영상데이타를 보조버퍼(18-2)에 저장하고, 그 이외의 다른 프레임번호일 때는 그 블록단위 영상데이타를 버리도록 한다. 예를 들어, 주버퍼(18-1)의 수신 프레임번호가 1번으로 설정되어 있을 때, 현재 수신되는 블록데이타의 프레임번호가 2번이면, 이를 보조버퍼(18-2)에 저장한다. 그러나, 수신되는 블록데이타의 프레임번호가 3번이면 이를 버린다. 다시 제215단계에서, 주버퍼(18-1)의 프레임번호와 수신된 블록데이타의 프레임번호가 일치하면, 제어부(16)는 주버퍼(18-1)에 설정한 블록번호와 그 수신된 블록단위 영상데이타의 블록번호가 일치하는 지를 비교한다(제 225단계). 제225단계의 비교결과 주버퍼(18-1)의 블록번호와 수신된 블록데이타의 블록번호가 일치하면, 주버퍼(18-1)에 수신된 블록데이타를 저장한다(제235단계). 그러나, 주버퍼(18-1)의 블록번호와 수신된 블록데이타의 블록번호가 일치하지 않으면, 해당 블록위치를 계산하여(제230단계) 주버퍼(18-1)의 계산된 위치에 저장한다(제235단계). 그런 다음, 제어부(16)는 주버퍼(18-1)가 다 채워졌는지 판단한다(제240단계). 주버퍼(18-1)가 다 채워졌으면, 영상신호처리부(18)는 주버퍼(18-1)의 내용을 복호화하여 화면상에 디스플레이한다(제245단계). 그러나, 주버퍼(18-1)가 다 채워지지 않았으면, 보조버퍼(18-2)가 다 채워졌는지 판단한다(제250단계). 보조버퍼(18-2)가 다 채워졌으면, 주버퍼(18-1)의 내용을 삭제하고, 보조버퍼(18-2)의 내용을 디스플레이한다. 그러나, 보조버퍼(18-2)가 다 채워지지 않았으면, 제240단계로 돌아가 단계를 반복수행한다.The second video communication terminal 10-2 receives block unit image data transmitted from the first video communication terminal 10-1 through the server 20. The controller 16 of the second video communication terminal 10-2 sets the current received frame number and the block number of the main buffer 18-1 (step 210). Then, the controller 16 sets the main buffer. The frame number set in step (18-1) and the frame number of the received block unit video data are compared with each other (step 215). If the frame number set in the main buffer 18-1 and the frame number of the received block unit image data do not coincide with the comparison result in step 215, the controller 16 converts the block unit image data into the main buffer 18-1. Instead, it is stored in the auxiliary buffer 18-2 (step 220). The control unit 16 stores the block unit image data in the auxiliary buffer 18-2 only when the frame number of the received block unit image data is the next number after the currently received frame number, and when it is any other frame number. The block unit video data is discarded. For example, when the receiving frame number of the main buffer 18-1 is set to 1, and if the frame number of the currently received block data is 2, it is stored in the auxiliary buffer 18-2. However, if the frame number of the received block data is 3, it is discarded. In step 215, if the frame number of the main buffer 18-1 and the frame number of the received block data match, the controller 16 sets the block number set in the main buffer 18-1 and the received block. The block numbers of the unit video data match each other (step 225). If the block number of the main buffer 18-1 and the block number of the received block data match, the received block data is stored in the main buffer 18-1 (step 235). However, if the block number of the main buffer 18-1 and the block number of the received block data do not match, the corresponding block position is calculated (step 230) and stored in the calculated position of the main buffer 18-1. (Step 235). Then, the controller 16 determines whether the main buffer 18-1 is full (step 240). When the main buffer 18-1 is full, the image signal processing unit 18 decodes the contents of the main buffer 18-1 and displays them on the screen (step 245). However, if the main buffer 18-1 is not full, it is determined whether the auxiliary buffer 18-2 is full (step 250). When the auxiliary buffer 18-2 is full, the contents of the main buffer 18-1 are deleted, and the contents of the auxiliary buffer 18-2 are displayed. However, if the auxiliary buffer 18-2 is not full, the process returns to step 240 and repeats the steps.

상술한 바와 같이, 본 발명의 영상통신을 위한 영상데이타 전송시스템은, 영상데이타의 프레임을 블록단위로 분할하여 전송하고, 전송된 영상데이타를 블록별로 비교하여 일단 버퍼에 저장하였다가 출력함으로써 영상데이타의 전송도중 전송속도의 차이 또는 서버의 라우팅경로의 바뀜 등으로 인한 전송에러를 방지할 수 있는 효과를 제공한다.As described above, the video data transmission system for video communication according to the present invention divides and transmits the frame of video data in block units, compares the transmitted video data for each block, stores them in a buffer, and then outputs the video data. It provides the effect to prevent transmission error due to the difference of transmission speed or the change of routing path of server during transmission.

Claims (4)

영상통신시스템이 있어서, 제1버퍼 및 제2버퍼를 구비하며, 부호화된 프레임단위 영상데이타를 일정크기의 블록으로 나누어 각 블록단위 영상데이타에 프레임번호와 프레임내 블록번호를 포함하는 프레임정보를 부가하여 전송하고, 수신할 때 수신되는 블록데이타에 실린 프레임정보를 설정된 프레임정보와 비교하여 그에 따라 상기 버퍼들중 하나에 저장한 후 복호화하여 디스플레이하도록 하는 영상신호처리부를 포함하는 개인용 통신단말; 및 다수개의 개인용 통신단말들과 연결되어 상기 개인용 통신단말로부터 입력되는 영상데이타를 해당 개인용 통신단말로 전송하는 서버를 포함하는 영상통신을 위한 영상데이타 전송시스템.In a video communication system, a first buffer and a second buffer are provided, and the encoded frame unit image data is divided into blocks of a predetermined size, and frame information including a frame number and an intra frame number is added to each block unit image data. A personal communication terminal including a video signal processing unit for transmitting and receiving the received frame data in the received block data, comparing the frame information with the set frame information, and storing the information in one of the buffers and then decoding and displaying the frame information; And a server connected to a plurality of personal communication terminals to transmit image data input from the personal communication terminal to a corresponding personal communication terminal. 제1항에 있어서, 상기 개인용 통신단말은 영상데이타를 수신할 때, 상기 제1버퍼에 수신 프레임번호 및 블록번호를 설정하고, 설정된 프레임번호와 수신되는 블록단위 영상데이타의 프레임번호를 비교하여 비교결과, 두 프레임번호가 일치하면 설정된 블록번호와 수신된 블록단위 영상데이타의 블록번호를 비교하여 두 블록번호가 일치하면 그 블록단위 영상데이타를 제1버퍼에 저장하고, 블록번호가 다르면 제1버퍼내의 블록위치를 계산하여 해단 위치에 저장하며, 설정된 프레임번호의 다음 프레임번호이면 그 블록단위 영상데이타를 제2버퍼에 저장하며, 그 이외의 다른 프레임번호이면 그 블록단위 영상데이타를 버리는 것을 특징으로 하는 영상통신을 위한 영상데이타 전송시스템.The personal communication terminal of claim 1, when receiving the image data, sets a receiving frame number and a block number in the first buffer, and compares the set frame number with the frame number of the received block unit image data. As a result, if the two frame numbers match, the set block number is compared with the block number of the received block unit video data. If the two block numbers match, the block unit video data is stored in the first buffer. Calculates the block position within and saves it at the end position, and if it is the next frame number of the set frame number, the block unit video data is stored in the second buffer, and if it is another frame number, the block unit video data is discarded. Image data transmission system for video communication. 제3항에 있어서, 상기 개인용 통신단말은 영상데이타의 프레임번호의 순서가 바뀌어 전송되면, 제2버퍼에 저장을 하는 것을 특징으로 하는 화상통신을 위한 영상데이타 전송시스템.The video data transmission system for video communication according to claim 3, wherein the personal communication terminal stores the data in the second buffer when the frame numbers of the video data are reversed and transmitted. 제5항에 있어서, 상기 제2버퍼가 다 채워질때까지 제1버퍼가 채워지지 않으면 제1버퍼에 수신된 영상데이타를 삭제하고, 제1버퍼가 다 채워지면 제1버퍼의 영상데이타를 출력하는 것을 특징으로 하는 화상통신을 위한 영상데이타 전송시스템.The method of claim 5, wherein the image data received in the first buffer is deleted if the first buffer is not filled until the second buffer is filled, and the image data of the first buffer is output if the first buffer is filled. Image data transmission system for video communication, characterized in that.
KR1019970027067A 1997-06-25 1997-06-25 Video data transmission system for video communication Expired - Fee Related KR100251449B1 (en)

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