Image data communicating apparatus and a communication data quantity adjusting method used in an image data communication system

• US 5,968,132 A
• Filed: 01/27/1997
• Issued: 10/19/1999
• Est. Priority Date: 02/21/1996
• Status: Expired due to Fees

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: Ishikawa, Mayumi, Matsuya, Tomoko, Tokunaga, Akira, Takimoto, Minoru
• Primary Examiner(s): Maung, Zarni
• Assistant Examiner(s): Winder, Patrice L.
• Application Number:
  US08/789,714
• Time in Patent Office: 995 Days
• Field of Search: 395/200.54, 395/200.56, 395/200.77, 395/200.62, 395/200.51, 345/131, 345/132, 345/346, 709/224, 709/226, 709/232, 709/231, 709/247
• US Class Current: 709/247
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/0852 Delays
• CPC Class Codes: H04L 43/0888 Throughput
• CPC Class Codes: H04L 47/10 Flow control; Congestion control
• CPC Class Codes: H04L 65/1101 Session protocols
• CPC Class Codes: H04L 65/80 Responding to QoS
• CPC Class Codes: H04L 69/04 Protocols for data compression, e.g. ROHC
• CPC Class Codes: H04L 69/24 Negotiation of communication capabilities
• CPC Class Codes: H04L 9/40 Network security protocols
• CPC Class Codes: H04N 21/238 Interfacing the downstream path of the transmission network, e.g. adapting the transmission rate of a video stream to network bandwidth; Processing of multiplex streams hybrid fiber coaxial [HFC] networks for downstream channel allocation for video distribution H04L12/2801; flow control in packet networks H04L47/10; real-time communication protocols in data switching networks H04L65/00; scheduling or organising the servicing of application requests H04L67/60
• CPC Class Codes: H04N 21/643 Communication protocols network streaming protocols, e.g. real-time transport protocol [RTP] or real-time control protocol [RTCP], H04L65/65

Abstract

Image data communicating apparatus and communication data quantity adjusting method in an image data communication system suitable for use when image data is transferred in a network environment. Image data is transferred in a most suitable quantity based on traffic of a network to avoid an effect on other services provided by the network. The apparatus has a data transmitting unit for transmitting image data to another image data communicating apparatus, a traffic detecting unit for detecting traffic of the network, and a communication data quantity adjusting unit for initially setting a transmittable number of image transferring frames on the basis of the detected traffic, and for automatically adjusting the quantity of data communication in the data transmitting unit on the basis of changing traffic on the network by altering the set number of frames.

Claims

1. An image data communicating apparatus for transmitting image data in an adjusted quantity to another image data communicating apparatus on a receiving end over a computer network, said image data communicating apparatus on a transmitting end comprising:

an image data transmitting unit for transmitting the image data to the receiving-end image data communicating apparatus;

traffic detecting means for detecting an end-to-end effective traffic of the computer network between said image data communicating apparatus on the transmitting end and that on the receiving end; and

a communication data quantity adjusting unit for setting a transmittable number of image frames on the basis of said end-to-end effective traffic detected by said traffic detecting unit and adjusting the quantity of the image data, which is to be transmitted by said data transmitting unit, in accordance with said set transmittable number of image frames.

2. The image data communicating apparatus according to claim 1, wherein said traffic detecting unit includes:

a survey data transmitting/receiving unit for transmitting survey data to said receiving-end image data communicating apparatus prior to transmitting the image data and receiving said survey data sent back from said receiving-end image data communicating apparatus over the computer network; and

a time measuring unit for measuring an elapsed time from when said survey data was transmitted at said survey data transmitting/receiving unit to said receiving-end image data communicating apparatus to when said survey data was returned to said survey data transmitting/receiving unit from said receiving-end image data communication apparatus, said end-to-end effective traffic being determined on the basis of said elapsed time measured by said time measuring unit.

3. The image data communicating apparatus according to claim 1, wherein said communication data quantity adjusting unit includes a table in which is stored a transmittable number of image transmitting frames in relation to said end-to-end effective traffic to set the image frame transmitting number by referring to said table on the basis of the traffic detected by said traffic detecting unit.

4. The image data communicating apparatus according to claim 1, wherein said traffic detecting unit detects end-to-end effective traffic of said network at predetermined time intervals to judge whether the image data can be transmitted in an initial quantity of communication data.

5. The image data communicating apparatus according to claim 4, wherein if said traffic detecting unit judges that the image data cannot be transferred in the initial quantity of communication data as the result of detection of said end-to-end effective traffic of said network, said communication data quantity adjusting unit re-adjusts said quantity of communication data.

6. The data communicating apparatus according to claim 4, further comprising:

a first image data compressing unit for compressing image data to be transmitted; and

a compression parameter variably controlling unit for variably controlling a compression parameter by said first image data compressing unit so as to bring a current number of frames close to said transmittable number of frames initially set by said communication data quantity adjusting unit, if said traffic detecting unit judges that the image data cannot be transmitted in an initial quantity of communication data as the result of detection of said end-to-end effective traffic.

7. The image data communicating apparatus according to claim 6, wherein said compression parameter variably controlling unit includes a table storing said compression parameter used by said first image data compressing unit in relation to said change in end-to-end effective traffic to variably control said compression parameter by referring to said table on the basis of the change in end-to-end effective traffic detected by said traffic detecting unit.

8. The image data communicating apparatus according to 4, further comprising:

a drawing size reducing unit for reducing a drawing size of image data; and

a drawing size control unit for controlling said drawing size reducing unit to reduce the drawing size to bring a current number of frames close to said number of frames initially set by said communication data quantity adjusting unit if said traffic detecting unit judges that the image data cannot be transmitted in the initial quantity of communication data as the result of detection of said end-to-end effective traffic.

9. The image data communicating apparatus according to claim 8, wherein the above drawing size control unit includes a table storing said drawing size in relation to said change in end-to-end effective traffic to control said drawing size by referring to said table on the basis of the change in end-to-end effective traffic detected by said traffic detecting unit.

10. The image data communicating apparatus according to claim 4, further comprising:

a second image data compressing unit for compressing the image data to be transmitted in a desired compressing method selected among plural compressing methods; and

a compressing method selecting unit for selecting a compressing method in said second image data compressing unit to bring a current number of frames close to the number of frames initially set by said communication data quantity adjusting unit if said traffic detecting unit judges that the image data cannot be transmitted in the initial quantity of communication data as the result of detection of said end-to-end effective traffic.

11. The image data communicating apparatus according to claim 10, wherein said compressing method selecting unit includes a table storing, said compressing methods in relation to said change in end-to-end effective traffic to select a compressing method by said second image data compressing unit by referring to said table on the basis of the change in end-to-end effective traffic detected by said traffic detecting unit.

12. An image communicating apparatus for transmitting image data in an adjusted quantity to another image data communicating apparatus on the receiving end over a computer network, said image data communicating apparatus on the transmitting end comprising:

an image data transmitting unit for transmitting said image data to the receiving-end image data communicating apparatus;

traffic detecting means for detecting end-to-end effective traffic of said network between said image data communicating apparatus on the transmitting end and that on the receiving end;

a communication data quantity adjusting unit for setting a transmittable number of image frames on the basis of end-to-end effective, traffic detected by said traffic detecting unit adjusting a quantity of the image data, which is to be transmitted by said data transmitting unit, in accordance with said set number of frames;

a first image data compressing unit for compressing image data to be transmitted;

a compression parameter variably controlling unit for variably controlling a compression parameter by said first image data compressing unit to bring a current number of frames close to said number of frames initially set by said communication data quantity adjusting unit on the basis of said end-to-end effective traffic detected by said traffic detecting unit;

a drawing size reducing unit for reducing a drawing size of image data;

a drawing size control unit for controlling to reduce the drawing size in said drawing size reducing unit so as to bring the number of frames close to said number of frames initially set by said communication data quantity adjusting unit on the basis of said end-to-end effective traffic detected by said traffic detecting unit;

a second image data compressing unit for compressing image data to be transmitted in a desired compressing method selected among plural compressing methods;

a compressing method selecting unit for selecting a compressing method by said second image data compressing unit to bring the number of frames close to the number of frames initially set by said communication data quantity adjusting unit on the basis of said end-to-end effective traffic detected by said traffic detecting unit; and

a selection controlling unit for selecting at least one data processing method among plural data processing methods by said communication data quantity adjusting unit, said first image data compressing unit, said drawing size reducing unit, and said second image data compressing unit according to said traffic, and for controlling performance of said at least one selected data processing method.

13. An image data communicating apparatus for receiving from another image data communicating apparatus on a transmitting end over a computer network image data whose quantity of communication data has been adjusted on the basis of end-to-end effective traffic on said transmitting-end image data communicating apparatus, comprising:

an image data receiving unit for receiving said image data from said transmitting-end image data communicating apparatus over said network;

an image data identifying unit for identifying a type of said image data received by said image data receiving unit; and

a display controlling unit for displaying said received image data on a displaying unit if said received image data is identified as image data as the result of identification on the type of said image data by said image data identifying unit.

14. The image data communicating apparatus on a receiving-end according to claim 13, further comprising:

a survey data controlling unit for sending back survey data to said transmitting-end image data communicating apparatus if said received image data is identified as said survey data transmitted from said transmitting-end image data communicating apparatus as the result of identification on the type of said image data by said image data identifying unit.

15. The image data communicating apparatus on a receiving end according to claim 13, further comprising:

a drawing size regenerating unit for enlarging a drawing size into an original size if said received image data is identified as image data whose drawing size has been reduced as the result of identification on the type of said image data by said image data identifying unit.

16. The image data communicating apparatus on a receiving end according to claim 13, wherein said display control unit is configured with a window display control unit for displaying said received image data in a window on the basis of a window processing system,

said receiving-end image data communicating apparatus further comprising:

a window managing unit for managing multiple windows in said window processing system; and

a transfer halt requesting unit for requesting an image data transmitting end to halt transfer of image data in a covered region if said window managing unit judges that a window displaying said image data said window managing unit is covered with another window.

17. The image data communicating apparatus on the receiving end according to claim 16, wherein if said window managing unit judges that a window displaying said image data therein is completely covered with another window, said transfer halt requesting unit requests said transmitting-end image data communicating apparatus, to temporarily halt image data transfer.

18. The image data communicating apparatus on a receiving end according to claim 13, wherein said display controlling unit is configured with a window display control unit for displaying said received image data in a window on the basis of a window processing system, said receiving-end image data communicating apparatus further comprising:

a focus state managing unit for managing a state of a focus in a window in said window processing system; and

a frame number adjusting signal outputting unit for outputting a signal instructing to adjust the number of transferring frames to an image data transmitting side according to a state of a focus in the window displaying said image data therein managed by said focus state managing unit.

19. The image data communicating apparatus according to claim 13, further comprising:

a priority-transfer region designating unit for designating an image region to be transferred by priority in a screen displayed on said displaying unit; and

a designated region notifying unit for notifying said transmitting-end image data communicating apparatus of information as to an image region designated by said preferentially transferred] priority-transfer region designating unit.

20. The image data communicating apparatus on a receiving end according to claim 13, wherein said display control unit is configured with a window display control unit for displaying said received image data in a window on the basis of a window processing system,

said receiving-end image data communicating apparatus comprising:

a pointing device position managing unit for managing a position of a pointing device in said window processing system;

a priority-transfer region designating unit for designating image data surrounding said pointing device as an image region to be transferred by priority if a position of said pointing device managed by said pointing device position managing unit is on image data displayed in a window by said window display control unit; and

a designated region notifying unit for notifying said transmitting-end image data communicating apparatus of information as to the image region designated by said priority-transfer region designating unit.

21. An image data communicating apparatus for transmitting and receiving image data to and from another image data communicating apparatus over a computer network, comprising:

transmitting means including

a data transmitting unit for transmitting said image data to said another image data communicating apparatus over said computer network,

a traffic detecting unit for detecting end-to-end effective traffic of said network between said image data communicating apparatus on a transmitting end and that on a receiving end,

a communication data quantity adjusting unit for setting a transmittable number of image frames on the basis of said end-to-end effective traffic detected by said traffic detecting unit adjusting the quantity of the image data which is to be transmitted by said transmitting unit, in accordance with said set transmittable number of image frames; and

a receiving unit including

a data receiving unit for receiving image data from said another image data communicating apparatus on said transmitting end over said network,

a data identifying unit for identifying the type of image data received by said data receiving unit, and

a display control unit for displaying image data on

a displaying unit if said received image data is identified as said image data by said data identifying unit.

22. The image data communicating apparatus according to claim 21, wherein said traffic detecting unit in said transmitting unit comprises a survey data transmitting/receiving unit for transmitting survey data to said another image data communicating apparatus on the receiving end prior to transmission of image data, and receiving said survey data sent back from said another image data communicating apparatus on the receiving end over said computer network, and a time measuring unit for measuring an elapsed time from when said survey data was transmitted at said survey data transmitting/receiving unit to said image data communicating apparatus on the receiving end to when said survey data was returned to said survey data transmitting/receiving unit from said receiving-end image data communication apparatus, said end-to-end effective traffic being determined on the basis of said elapsed time measured by said time measuring unit,

said image data communicating apparatus further comprising a survey data control unit for sending back survey data to said another image data communicating apparatus on the transmitting end if said received image data is identified as said survey data sent back from said another image data communicating apparatus as the result of identification on the type of said data by said data identifying unit, and outputting said survey data to said survey data transmitting/receiving unit if said received data is identified as said survey data transmitted from said survey data transmitting/receiving unit as the result of identification on the type of data by said data identifying unit.

23. The image data communicating apparatus according to claim 21, wherein said transmitting unit further comprises a drawing size reducing unit for reducing a drawings size of image data, and a drawing size control unit for controlling to reduce a drawing size in said drawing size reducing unit so as to bring the number of frames close to the number of frames initially set by said communication data quantity adjusting unit if said traffic detecting unit judges that the image data cannot be transferred in the initial quantity of communication data,

said receiving unit further including a drawing size regenerating unit for enlarging said drawing size of said received image data into an original size and displaying said image data if the drawing size of said received image data has been reduced.

24. The image data communicating apparatus according to claim 21, wherein said display control unit of said receiving unit is configured with a window display control unit for displaying said received image data in a window on the basis of a window processing system, said display control unit including a window managing unit for managing windows in said window processing system, and a transfer halt requesting unit for requesting said image data communicating apparatus on the transmitting-end to halt transfer of image data in a covered region if said window managing unit judges that a window displaying said image data therein is covered with another window,

said data transmitting unit in said transmitting unit being operable to halt transmission of said image data in said covered region if receiving a request to halt transfer of said image data from said image data communicating apparatus on the receiving end.

25. The image data communicating apparatus according-to claim 21,

wherein said display control unit in said receiving unit is configured with a window display control unit for displaying said received image data in a window on the basis of a window processing system, said display control unit including a focus state managing unit for managing a state of a focus in a window in said window processing system, and a frame number adjusting signal outputting unit for outputting a signal instructing to adjust the number of transferring frames to an image data transmitting side according to a state of a focus in a window displaying said image data therein managed by said focus state managing unit;

and

wherein if said data transmitting unit of said transmitting unit receives said signal instructing to adjust the number of transferring frames from said image data communicating apparatus on the receiving end, said data transmitting unit adjusts said number of frames on the basis of said signal.

26. The image data communicating apparatus according to claim 21, wherein said receiving unit has a priority-transfer region designating unit for designating an image region to be transferred by priority in a screen displayed on said displaying unit, and a designated region notifying unit for notifying said transmitting-end image data communicating apparatus of information as to said image region designated by said priority-transfer region designating unit,

said data transmitting unit of said transmitting means (unit being inputted thereto from the image data receiving side] being operable to input the information as to said designated image region from the image data receiving side so as to transfer said designated image region by priority, (and to decrease] although decreasing a frequency of transfer of image data of the remaining parts that are (not designated] undesignated.

27. The image data communicating apparatus according to claim 21, wherein said display control unit of said receiving unit is configured with a window display control unit for displaying said received image data in a window on the basis of a window processing system, said display control unit including a pointing device position managing unit for managing the position of a pointing device in said window processing system, a priority-transfer region designating unit for designating image data surrounding said pointing device as an image region (that should] to be transferred by priority if the position of said pointing device managed by said pointing device position managing unit is on image data displayed in a window by said window display control unit, and a designated region notifying unit for notifying said transmitting-end image data communicating apparatus of information (to the image data transmitting side] as to said designated image region by said priority-transfer region designating unit,

said data transmitting unit of said transmitting means being operable to input the information as to said designated image region from the image data receiving side so as to transfer said designated image region by priority, although decreasing a frequency of transfer of image data of the remaining parts that are (not designated] undesignated.

28. A communication data quantity adjusting method used in an image data communication system having plural image data communicating apparatuses for transmitting image data in an adjusted quantity to another image data communicating apparatus on a receiving end over a computer network said communication data quantity adjusting method comprising the steps of:

setting a transmittable number of image data transferring frames on a basis of traffic of said network in the image data communicating apparatus on the transmitting side and

automatically adjusting a quantity of communication data transmitted on a basis of current end-to-end effective traffic of said network.

29. The communication data quantity adjusting method according to claim 28, further comprising the steps of examining a state of the end-to-end effective traffic at predetermined time intervals in said image data communicating apparatus on the transmitting side to judge whether or not the image data can be transferred in an initial quantity of communication data.

30. The communication data quantity adjusting method according to claim 29, wherein when it is judged that said image data cannot be transferred in frames in the initial number, resetting a transmittable number of image data transferring frames for said image data on the basis of the traffic of said network to re-adjust the quantity of communication data.

31. The communication data quantity adjusting method according to claim 29, wherein when it is judged that said image data cannot be transferred in frames in the initial number, compressing said image data on the basis of a compression parameter set on the basis of the traffic of said network and transmitting said compressed image data said compression controlling to bring a currently transferable number of frames for said image data close to the initial number of frames.

32. The communication data quantity adjusting method according to claim 29, wherein when it is judged that said image data cannot be transferred in frames in the initial number, altering image size of said image data on the basis of the current traffic of said network to transmit said image data, said altering controlling to bring a currently transferable number of frames for said image data close to the initial number of frames.

33. The communication data quantity adjusting method according to claim 32, wherein when said image data communicating apparatus on the receiving side receives image data whose image size has been altered, restoring said received image data to an original size and displaying said image data.

34. The communication data quantity adjusting method according to claim 29, wherein when it is judged that said image data cannot be transferred in frames in the initial number, compressing said image data using a desired compressing system on the basis of the traffic of said network to transmit said image data, said desired compressing system controlling to bring a currently transferable number of frames for said image data close to the initial number of frames.

35. The communication data quantity adjusting method according to claim 28, preferentially transferring image data in a region designated by a user within a screen in which said image data is drawn in said image data communicating apparatus on a receiving side by said image data communicating apparatus on the transmitting side and decreasing a frequency of transfer of image data of another region.

36. A communication data quantity adjusting method used in an image data communication system having plural image data communicating apparatuses for transmitting image data in an adjusted quantity to another image data communicating apparatus on a receiving end over a computer network each of said image data communicating apparatuses displaying said received image data in a window by a window system, said communication data quantity adjusting method comprising the steps of:

setting a transmittable number of image data transferring frames on a basis of end-to-end effective traffic of said network in the image data communicating apparatus on a transmitting side, and

automatically adjusting a quantity of communication data transmitted on a basis of current end-to-end effective traffic of said network.

37. The communication data quantity adjusting method according to claim 36, wherein when said image data displayed in the window is covered with another window, comprising a further step of requesting a halt to transfer of image data in said covered region, said requesting being made of an image data transmitting side by image data transmitting apparatus on a receiving side.

38. The communication data quantity adjusting method according to claim 37, wherein when the image data communicating apparatus on the transmitting side receives the request from said image data communicating apparatus on the receiving side to halt transfer of said image data, comprising the further step of halting transmission of image data in said covered region.

39. The communication data quantity adjusting method according to claim 36, further comprising the step of varying the number of transferring frames that should be transmitted from the image data communicating apparatus on the receiving side on the basis of a state of focus in a window displaying image data therein in the image data communicating apparatus on the receiving side.

40. The communication data quantity adjusting method according to claim 36, wherein image data surrounding a pointing device within a window displaying the image data therein in the image data communicating apparatus on the receiving side is preferentially transferred from the image data communicating apparatus on the transmitting side and a frequency of transfer of image data of another part, not surrounding said pointing device, is decreased.

41. A communication data quantity adjusting method used in an image data communication system having plural image data communicating apparatuses for transmitting image data in an adjusted quantity to another image data communicating apparatus on a receiving end over a computer network said communication data quantity adjusting method comprising the steps of:

transmitting over said network survey data used to detect end-to-end effective traffic of said network along with said image data from the image data communicating apparatus on a transmitting side to the image data communicating apparatus on a receiving side;

identifying said image data and said survey data from said image data communicating apparatus on the transmitting side in the image data communicating apparatus on the receiving side, sending back said survey data to said image data communicating apparatus on the transmitting side, while displaying said image data on a displaying unit;

detecting said traffic of said network on the basis of the survey data from said image data communicating apparatus on the receiving side in said image data communicating apparatus on the transmitting side,

setting a transmittable number of image data transferring frames on the basis of said detected traffic of said network, a quantity of communication data being automatically controlled.