JP5901945B2 - Screen transfer device - Google Patents

Description

Embodiments described herein relate generally to a screen transfer apparatus .

  In a conventional thin client system using screen transfer, as disclosed in Patent Document 1, a relay device is interposed between an application server and a client terminal, and time information calculated in the device is transferred to the terminal side. To display the information on the terminal side (see, for example, Patent Document 1).

  In addition, there is a type that manages the traffic generated in the thin client system in a two-state system of data flow related to character information such as keyboard / mouse events and data flow related to screen information and separates the TCP connection of both data flows (for example, Non-Patent Document 1).

JP 2004-349965 A (page 17, FIG. 1) Yukio Ogawa and two others: “Delay Analysis and TCP Layer Optimization for Performance Improvement of Thin Client Traffic”, IEICE Technical Report, vol. 108, no. 204, IN 2008-56, September 2008, pp. 75-80

  However, the method of Patent Document 1 considers the screen drawing time on the terminal side, and adjusts the timing for transmitting a screen acquisition request so that acquisition of the next drawing screen is completed when drawing is completed. The screen on the server side and the screen on the server side do not extremely shift, and regular screen changes cannot be reproduced on the terminal side in accordance with the original rules generated on the server side. Further, since the non-patent document 1 does not pay attention to the characteristics relating to the screen information, it is necessary to minimize only the delay of specific screen information and reproduce the regular screen change according to the original rule. Not available.

  As described above, the conventional screen cannot reproduce the regular screen change generated on the server side in accordance with the original rule on the terminal side.

An object of the present invention is to provide a screen transfer apparatus capable of reproducing regular screen changes that have occurred on the transmission side in accordance with rules that have occurred on the reception side as well.

The screen change detection unit of the screen transfer device according to the embodiment of the present invention detects a screen change that occurs in the server device that transmits screen information to the client device. Priority transmission detector detects a scene change to be transmitted screen change there is regularity among the screen change detected by the scene change detection unit preferentially to the client device. The priority transmission control unit controls to preferentially transmit the screen change detected by the priority transmission detection unit to the client device. The screen information transmission unit transmits the screen change to the client device according to the transmission method controlled by the priority transmission control unit.

1 is a simplified diagram showing a screen transfer system to which a screen transfer device according to a first embodiment of the present invention is applied. 1 is a block diagram of an example of a screen transfer device according to a first embodiment. 6 is a flowchart showing the operation of the screen transfer apparatus 1 according to the first embodiment. Explanatory drawing of the detection reference | standard at the time of the priority transmission detection part which concerns on 1st Embodiment detecting automatically the screen change which should be transmitted preferentially based on the past screen change. Explanatory drawing of an example which thins and transmits the screen change which the priority transmission control part which concerns on 1st Embodiment transmits non-priorally. Explanatory drawing of an example at the time of adjusting a transmission schedule so that the priority transmission control part which concerns on 1st Embodiment can transmit the screen change which should be transmitted preferentially. The block diagram of the screen transfer apparatus which the screen information transmission part 14 which concerns on 1st Embodiment has only one screen information transmission means 14a. FIG. 3 is a block diagram of a screen transfer apparatus in which the screen information transmission unit according to the first embodiment has four screen information transmission units. The block diagram of an example of the screen transfer apparatus which concerns on 2nd Embodiment. The flowchart which shows an example of the processing content of the screen transfer apparatus 1 in 2nd Embodiment. The flowchart of the processing content at the time of starting a process with the timer of the screen transfer apparatus which concerns on 2nd Embodiment of this invention. Explanatory drawing of an example of the processing content which the priority transmission screen change correction | amendment part which concerns on 2nd Embodiment correct | amends according to the rule hold | maintained by the priority transmission screen change information holding part. Explanatory drawing of the other example of the processing content correct | amended according to the rule which the priority transmission screen change correction part which concerns on 2nd Embodiment hold | maintained in the priority transmission screen change information holding part.

  Hereinafter, embodiments of the present invention will be described.

(First embodiment)
FIG. 1 is a simplified diagram showing a screen transfer system according to the first embodiment of the present invention. In this screen transfer system, a screen transfer device 1 and a client device 2 are connected via a network 3. The network 3 here is a LAN connection or an Internet connection.

  In the screen transfer apparatus 1, an application is activated. In the first embodiment, a screen transmission function is incorporated in the screen transfer device 1, and regular screen changes can be reproduced by the receiving terminal with correct rules for the screen information generated by the application on the screen transfer device 1. After processing, the data is transmitted to the client device 2 via the network 3.

  In the screen transfer system according to the first embodiment, the screen transfer device 1 transmits screen data to the client device 2 using a push-type screen transfer protocol. The push type is a method of transmitting screen data from the screen data transmission side to the screen data reception side without requiring a screen data acquisition request from the screen data reception side.

  In other words, in the first embodiment, screen data is not transferred from the screen transfer device 1 on which the server software is running to the client device 2 without requiring a screen data acquisition request from the client device 2 on which the client software is running. Send.

  However, the screen transfer method is not limited to the push type, and may be a pull type. The pull type is a method in which screen data is transmitted from the screen transfer device 1 on the screen data transmission side to the screen data reception side in response to a screen data acquisition request from the client device 2 on the screen data reception side.

  As described above, in the screen transfer system of the first embodiment, the screen generated by the screen transfer device 1 is transferred to the client device 2 and displayed on the client device 2. The client device 2 receives the screen information from the screen transfer device 1 and generates and draws a screen to be displayed on a display unit (not shown) of the client device 2 from the received screen information.

  FIG. 2 is a block diagram of an example of the screen transfer apparatus 1 according to the first embodiment of the present invention. FIG. 2 shows a functional configuration according to the present invention. The screen transfer apparatus 1 according to the first embodiment includes a screen change detection unit 11, a priority transmission detection unit 12, a priority transmission control unit 13, and a screen information transmission unit 14. The screen information transmission unit 14 transmits the first screen information. Means 14a and second screen information transmission means 14b are provided.

  The screen change detection unit 11 detects a screen change that has occurred in the screen transfer apparatus 1. When a screen change occurs in the screen transfer apparatus 1, the contents of the change are drawn in a frame buffer (not shown) that generates screen information of the screen transfer apparatus 1. That is, the picture generated by the screen change is drawn in the area where the change has occurred.

  The screen change detection unit 11 may detect the content itself written in the frame buffer or take a difference from a screen change that has occurred before and eliminate the screen change in which the pixel value does not actually change. Thus, the processing may be made more efficient. The difference from the previous screen change is the difference from the content held in the frame buffer before the current screen change is drawn in the frame buffer.

  The priority transmission detection unit 12 detects a screen change to be preferentially transmitted to the client device 2 from the screen changes detected by the screen change detection unit 11. For example, when designating that a screen change that has occurred in advance for a specific area is preferentially transmitted to the client device 2, the occurrence of a screen change for the area is detected from the screen changes detected by the screen change detection unit 11. To do. In addition to this, there is a method of learning past screen changes and detecting a screen change to be transmitted with priority from the learned screen changes. This will be described later.

  The priority transmission control unit 13 controls to preferentially transmit the screen change detected by the priority transmission detection unit 12 to the client device 2. For example, in the first embodiment, the screen information transmission unit 14 includes two screen information transmission units, a first screen information transmission unit 14a and a second screen information transmission unit 14b.

  At this time, depending on whether or not there is a screen change to be preferentially transmitted such that a screen change to be preferentially transmitted is transmitted by the first screen information transmitting unit 14a and other screen changes are transmitted by the second screen information transmitting unit 14b. By controlling the transmission method to the client device 2, the screen change to be preferentially transmitted is prevented from arriving at the client device 2 due to other screen changes.

  In addition to this, it is possible to preferentially transmit screen changes that should be sent preferentially by thinning out screen changes that should be sent preferentially and screen changes that were not detected (screen changes that should not be sent preferentially). Control as follows. Further, the transmission schedule is adjusted so that the screen change to be transmitted with priority can be transmitted with priority. These will be described later.

  As described above, the first screen information transmission unit 14 a and the second screen information transmission unit 14 b transmit the screen information detected by the screen change detection unit 11 to the client device 2. As to how to use the first screen information transmission unit 14a and the second screen information transmission unit 14b properly, as described above, the screen change that should be preferentially transmitted by one of the screen information transmission units, Send screen changes.

  In the first embodiment, the first screen information transmission unit 14a and the second screen information transmission unit 14b transmit screen information to the client device 2 using a push-type screen transfer protocol. On the client device 2 side, a screen is generated and drawn based on the screen information received from the two screen information transmitting means 14.

  Further, the first screen information transmission unit 14a and the second screen information transmission unit 14b are realized by a method in which two TCP connections for connecting the screen transfer apparatus 1 and the client apparatus 2 are prepared and each connection is used properly. Alternatively, the screen transfer apparatus 1 may have two NICs (Network Interface Cards), and each NIC may be used properly. Furthermore, the connection method for connecting the screen transfer device 1 and the client device 2 is not limited to one. Therefore, for example, the screen transfer device 1 and the client device 2 are connected by a plurality of connection methods, such as one wireless LAN and the other Bluetooth (registered trademark), and the first screen information according to each connection method. A method of using the transmission unit 14a and the second screen information transmission unit 14b properly may be used.

  FIG. 3 is a flowchart showing the processing in the screen transfer apparatus 1 according to the first embodiment of the present invention. First, when screen transfer is started (step S100), the screen change detection unit 11 detects a screen change area generated in the screen transfer device 1 (step S101). Next, the priority transmission detection unit 12 detects whether the generated screen change is a screen change to be transmitted with priority (step S102), and the priority transmission control unit 13 determines which connection the screen change should be transmitted to. Select (step S103). The screen information transmission unit 14 transmits the screen change through the selected connection. That is, when the screen change is to be preferentially transmitted, it is transmitted by the first screen information transmitting unit 14a (step S104), and when it is a screen change that does not require priority transmission, it is transmitted by the second screen information transmitting unit 14b (step S104). S105). The above processing is repeated until the screen transfer is completed.

  FIG. 4 is an explanatory diagram of detection criteria used when the priority transmission detection unit 12 automatically detects a screen change to be preferentially transmitted based on past screen changes. The priority transmission detection unit 12 learns the screen change detected by the screen change detection unit 11 for a certain finite time T, and among the three rules (a), (b), and (c) shown in FIG. When it is determined that there is a screen change constituted by one or a plurality of combinations, these screen changes are automatically detected as screen changes to be transmitted with priority (regular screen changes).

  FIG. 4A shows an example in which the screen is changed many times in the same area during the finite time T, for example, random flashing. At this time, there may be no rule for the type of screen to be changed and the interval to be changed.

  FIG. 4B shows an example in which the screen changes many times at the same time interval during the finite time T, for example, random drawing that becomes a screen saver or the like. At this time, there may be no rule for the type of screen to be changed and the position (region) to be changed.

  FIG. 4C shows an example in which the same type of screen changes many times during a finite time T, for example, mouse movement. At this time, there may be no rule for the changing interval and the changing position (region).

  FIG. 5 is an explanatory diagram of an example in which the priority transmission control unit performs transmission by thinning out screen changes transmitted non-prioritizedly. The priority transmission control unit 13 performs control so as to preferentially transmit a screen change to be preferentially transmitted by thinning out a screen change to be preferentially transmitted and a screen change that has not been detected.

  FIG. 5A shows an example of a screen change on the screen transfer apparatus 1. A screen change (A) that should be preferentially transmitted is shown in the shaded shaded rectangular area in the upper left, and a screen change (B) that does not have to be preferentially sent in the white plain rectangular area in the lower right is shown. . The screen change (A) to be preferentially transmitted is a periodic blinking that changes from (I) → (II) → (I) in FIG. Here, for convenience of explanation, an example is shown in which the change in screen change (B) that may not be preferentially transmitted is also changed in the same area. In the region of good screen change (B), the screen change is merely generated in a burst manner, and is not a regular screen change.

  At this time, the actual screen change seen in time series is as shown in FIG. As shown in FIG. 5B, the screen change (A) and the screen change (B) are mixed in the actual screen change.

  Next, (c) of FIG. 5 shows the result of the screen change detection detected by the screen change detector 11. As shown in FIG. 5C, although the screen change (A) actually changes at regular time intervals, the screen change (A) occurs because the screen change (B) occurs in a burst manner. As a result, it was found that the detection could not be performed at regular time intervals.

FIG. 5D shows the result of thinning out part of the screen change (B) at this time.

  If the screen change (B) is a screen change occurring in a burst in the same area, even if only the latest screen is transmitted at the timing of detecting the screen change, the screen change is displayed on the client device 2. Think that there will be no big difference. For this reason, the priority transmission control unit 13 performs control so that a part of the screen change (B) is thinned out and the screen change (A) can be transmitted at regular timing.

  FIG. 6 is an explanatory diagram of an example when the transmission schedule is adjusted so that the priority transmission control unit 13 can preferentially transmit a screen change to be transmitted with priority. FIGS. 6A to 6C show the same signals as those in FIGS. 5A to 5C. As a result of the screen change detection shown in (c) of FIG. 6, when the timing at which the screen change (A) should be transmitted does not become a regular timing, the timing for transmitting the screen change (B) is adjusted by scheduling to change the screen change. Control (A) so that it can be sent at regular timing.

  FIG. 6D shows a method for adjusting the timing. When it becomes clear that the transmission timing of the screen change (A) cannot be transmitted regularly due to the screen change (B) generated in a burst manner, the priority transmission control unit 13 changes the order of transmission from the screen information transmission unit 14 so that the screen change (A) is sent first and the screen change (B) is sent later.

  The operation of the priority transmission control unit 13 shown in FIG. 5 and FIG. 6 is as follows. As shown in FIG. 2, the screen information transmission unit 14 is changed into two first screen information transmission units 14a and second screen information transmission unit 14b. A separate implementation method may be used, or as shown in FIG. 7, the screen information transmission unit 14 may have only one screen information transmission unit 14a. FIG. 7 is a block diagram of the screen transfer apparatus 1 that the screen information transmission unit 14 has only one screen information transmission unit 14a.

  Conversely, the screen information transmission unit 14 is not limited to one or two. For example, an implementation method having three or more may be used. FIG. 8 is a block diagram of the screen transfer apparatus 1 in which the screen information transmission unit 14 has four screen information transmission means 14. As shown in FIG. 8, a third screen information transmission unit 14c and a fourth screen information transmission unit 14d are provided for the screen information transmission unit 14 of FIG.

  In FIG. 8, for example, a plurality of areas (for example, three areas) are designated in advance as “screen areas to be preferentially transmitted” detected by the priority transmission detection unit 12, and the screen change for the designated areas is performed. If any of the first screen information transmission unit 14a, the second screen information transmission unit 14b, and the third screen information transmission unit 14c is detected, the screen is displayed in an area other than the designated area to be transmitted with priority. When a change is detected, the fourth screen information transmission unit 14d is used to transfer to the client device 2. As for how to use the screen information transmission means of each screen information transmission unit 14, in addition to the above description, there may be a method in which several priorities are given to screen changes to be transmitted with priority and used in the order of priority. Absent.

  As described above, according to the screen transfer device 1 according to the first embodiment, the screen change to be transmitted with priority is detected and controlled to be transmitted with priority. Transfer can be performed preferentially.

(Second Embodiment)
FIG. 9 is a block diagram of an example of the screen transfer apparatus 1 according to the second embodiment of the present invention. The screen transfer apparatus 1 according to the second embodiment includes a priority transmission screen change monitoring unit 21, a priority transmission screen change correction unit 22, and a priority transmission screen change information holding unit 23, compared to the first embodiment shown in FIG. It is added.

  The priority transmission screen change monitoring unit 21 monitors whether or not a screen change to be transmitted preferentially held in the priority transmission screen information holding unit 23 is generated from the screen change detected by the screen change detection unit 11. Further, in addition to monitoring the screen change actually generated in the screen transfer apparatus 1, whether or not a screen change has occurred is separately monitored in accordance with the rules held in the priority transmission screen change information holding unit 23. In the second embodiment, an example in which a screen change that changes at a certain time interval is used as a rule is shown. A timer 15 that cuts at a time interval held by the priority transmission screen change information holding unit 23 is prepared. As a result, whether or not a screen change that should be transmitted preferentially occurs is monitored.

  The priority transmission screen change correction unit 22 is generated in accordance with a rule in which a screen change to be preferentially transmitted occurs as a result of monitoring whether or not a screen change to be preferentially transmitted is monitored by the priority transmission screen change monitoring unit 21. If not, the screen information to be transmitted to the client device 2 is corrected according to the rule based on the information held by the priority transmission screen change information holding unit 23. This correction will be described later.

  The priority transmission screen change information holding unit 23 holds the screen change information detected as a screen change to be transmitted with priority by the priority transmission detection unit 12 as a rule. For example, for a certain rectangular area, when a screen change in which x types of screens change at the time interval d is held as a rule, (i) screen region information that changes, (ii) screens that make up the screen change (x types) Min), (iii) Three information of changing time intervals are held together. Note that some rules are implemented by one or a combination of a plurality of the three types described in FIG. 4, and therefore, the number of rules that are implemented is retained. The rule in the second embodiment will be described for a rule that combines all three types.

  The screen transfer apparatus 1 according to the second embodiment has two triggers for starting the process indicated by the priority transmission screen change monitoring unit 21. The first is an opportunity to “start processing by detecting a screen change occurring in the screen transfer apparatus 1”, and the second is an opportunity to “start processing by the timer 15”. Processing according to each opportunity will be described with reference to FIGS. 10 and 11.

  FIG. 10 is a flowchart illustrating an example of processing contents of the screen transfer apparatus 1 according to the second embodiment of the present invention. The processing contents shown in FIG. 10 are for a case where the processing is started by detecting a screen change occurring in the screen transfer apparatus 1, and the processing when the processing is started by the timer 15. Details are omitted.

  First, when screen transfer is started (step S200), the priority transmission detection unit 11 detects a screen change area generated in the screen transfer device 1 (step S201), and when the screen transmission is detected by the priority transmission detection unit 11. The priority transmission screen change monitoring unit 21 checks whether the generated screen change is held in the priority transmission screen change information holding unit 23 as “screen change to be preferentially transmitted” (step S202). At the start of the screen transfer process (initial state), there is no screen change being held, so the process follows no. Next, the priority transmission detection unit 12 detects whether or not the screen change to be processed is “screen change to be preferentially transmitted” (step S203). When a screen change to be transmitted with priority is detected, the detected screen change information (rule information) is registered in the priority transmission screen change information holding unit 23 (step S204). If the rule registered in step S204 is related to time, the timer 15 for monitoring whether or not a screen change occurs according to the rule is set (step S205).

  On the other hand, when the screen change to be processed in step S202 is held in the priority transmission screen change information holding unit 23 (when the process proceeds to yes in step S202), the screen change is changed to the priority transmission screen change information holding unit. It is checked whether or not the screen changes in accordance with the rule held at 23 (step S206).

  For example, it is determined whether or not the screen change based on the time interval shown in FIG. 4 changes at regular time intervals. If it is determined in step S206 that the screen change is not in accordance with the rules (if no), the priority transmission screen change correction unit 22 holds the screen change to be processed in the priority transmission screen change information holding unit 23. Correction is made so that the screen changes in accordance with the rule (step S207). For example, when the time interval for changing the screen is regular, but the type of the changing screen is different, correction is made so that the screen changes with the correct type. This correction process will be described later.

  When the above processing is completed, the priority transmission control unit 13 selects which connection to transmit the screen change (step S208). The screen information transmission unit 14 transmits the screen change through the selected connection. That is, when the screen change is to be preferentially transmitted, it is transmitted by the first screen information transmitting unit 14a (step S209), and when it is a screen change that does not require priority transmission, it is transmitted by the second screen information transmitting unit 14b (step S209). S210). The above processing is repeated until the screen transfer is completed.

  FIG. 11 is a flowchart of processing contents when the processing is started by the timer 15 of the screen transfer apparatus 1 according to the second embodiment of the present invention. This flowchart is for the case where the process is started by the timer 15, and is not a process flowchart from the start of the screen transfer process, but a process after the timer 15 is set by step S205 in FIG. It turns out that.

  First, when the timer is set in step S205 in FIG. 10 (step S300), the process waits for the timer 15 to be disconnected (step S301). When the timer 15 is disconnected, the priority transmission screen change monitoring unit 21 checks whether or not a screen change according to the rules held by the priority transmission screen change information holding unit 23 occurs according to the rules (step S302). . That is, it is checked whether a screen change occurs at regular time intervals.

  When there is no screen change according to the rule, that is, when there is screen change information that does not change the screen according to the rule among the held rule information, the priority transmission screen change correction unit 22 Then, the screen change is corrected in accordance with the rules held by the priority transmission screen change information holding unit 23 (step S303).

  Thereafter, based on the corrected screen information, the priority transmission control unit 13 selects which connection should transmit the screen change (step S304). The screen information transmission unit 14 transmits the screen change through the selected connection. That is, when the screen change is to be preferentially transmitted, it is transmitted by the first screen information transmitting unit 14a (step S305), and when it is a screen change that does not require priority transmission, it is transmitted by the second screen information transmitting unit 14b (step S305). S306).

  On the other hand, in step S302, if all the screen changes that have been held are changing according to the rule information, the process proceeds to no and only the timer 15 is set again.

  FIG. 12 is an explanatory diagram illustrating an example of the processing content that the priority transmission screen change correction unit 22 according to the second embodiment corrects in accordance with the rules held by the priority transmission screen change information holding unit 23. FIG. 12 shows a case where the screen change is corrected by taking as an example a case where the combination of the two types of rules (b) and (c) in FIG. 4 is satisfied.

  FIG. 12A shows an actual screen change in the screen transfer apparatus 1 by representing frame buffer changes in time series. This screen change shows a screen change in which the screen (A) moves in the horizontal direction by x [pixel] at a time interval t0 (t0 <T) smaller than the rule detection time T.

  FIG. 12B shows a screen change detected by the screen change detection unit 11 when the screen change of FIG. 12A occurs. Here, an example in which only an area (regular change area) in which the pixel value has actually changed is extracted (an example that does not include the background) is shown. In FIG. 12B, the time interval until the third screen change is shown. Although the change area can be detected at the timing of t0, the case where the change area cannot be detected in the fourth screen change at the arrow point is shown. This shows a case where an image is not detected at a position x [pixel] away from the previous screen change at the timing of the fourth screen change at the arrow location.

  At this time, using the flowchart of FIG. 11 (the flowchart of starting the process of the priority transmission screen change monitoring unit 21 by the timer 15), it is determined whether there is a screen change that does not comply with the rules at the time interval t0 ( Step S302). FIG. 12B shows a case where it is detected that the fourth screen change has not occurred.

  (C) in FIG. 12 is based on the rule held in the priority transmission screen change information holding unit 23 based on the result of detecting that the screen change in accordance with the rule does not occur according to the rule in FIG. 12 (b). 3 shows a state in which a screen change is corrected by the priority transmission screen change correction unit 22. In FIG. 12C, the fourth screen change at the arrow is compensated by using the correct screen at the correct timing. That is, the image is corrected to a position that is x [pixel] away from the previous screen change at the timing of the fourth screen change at the arrow location.

  FIG. 13 is an explanatory diagram of another example of processing contents that the priority transmission screen change correction unit 22 corrects in accordance with the rules held by the priority transmission screen change information holding unit 23. FIG. The case where the screen change is corrected is shown taking as an example the case where all of the three types of rules (a), (b), and (c) are satisfied.

  FIG. 13A shows an actual screen change in the screen transfer apparatus 1 by representing frame buffer changes in time series. This screen change shows a state of screen change in which two types of screens (A) and (B) are alternately displayed in the same rectangular area at the timing of the time interval t0.

FIG. 13B shows a screen change detected by the screen change detection unit 11 when the screen change of FIG. 13A occurs. Here, an example is shown in which only the region where the pixel value has actually changed is extracted, and in FIG. 13B, it can be detected that a screen change according to the rule has occurred until the third screen change. However, it shows a case where the fourth screen change at the arrow location could not be detected.

  FIG. 13C shows the rule held by the priority transmission screen change information holding unit 23 based on the result of detecting that the screen change according to the rule did not occur according to the rule in FIG. As a rule, it shows how the screen changes are corrected. Here, the fourth screen change at the arrow location is compensated for in the correct area with the correct screen at the correct timing.

  12 and 13 show an example of a method for monitoring and correcting a screen change to be preferentially transmitted. However, the preferential transmission detecting unit 12 described with reference to FIG. Needless to say, the method for correcting the screen change is not limited to the combinations shown in FIGS.

  As described above, according to the screen transfer apparatus 1 according to the second embodiment, the regularity of the screen change to be transmitted with priority is detected, and the transmission is performed with priority by correcting the screen change in accordance with the rule. It is possible to guarantee the regularity of the screen change.

  The screen transfer apparatus 1 can also be realized by using, for example, a general-purpose computer apparatus as basic hardware. That is, it can be realized by causing a processor mounted on the computer apparatus to execute a screen transfer program. At this time, it may be realized by installing the above program in a computer in advance, or it may be stored in a storage medium such as a CD-ROM or distributed through the network, and this program may be distributed to the computer. You may implement | achieve by installing in an apparatus suitably. Further, it can be realized by appropriately using a memory, a hard disk, or a storage medium such as a CD-R, a CD-RW, a DVD-RAM, a DVD-R, or the like that is built in or externally attached to the computer.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1 ... Screen transfer apparatus, 2 ... Client apparatus, 3 ... Network, 11 ... Screen change detection part, 12 ... Priority transmission detection part, 13 ... Priority transmission control part, 14 ... Screen information transmission part, 15 ... Timer, 21 ... Priority Transmission screen change monitoring unit, 22 ... Priority transmission screen change correction unit, 23 ... Priority transmission screen change information holding unit

Claims (6)

A screen change detecting unit for detecting a screen change occurring in the server device that transmits screen information to the client device, and a regular screen change among the screen changes detected by the screen change detecting unit is given priority to the client device. a priority transmission detector for detecting a scene change to be transmitted to the priority transmission control unit for controlling to transmit the screen changes detected by the priority transmission detecting unit preferentially to the client device, at the priority transmission control unit A screen transfer device comprising: a screen information transmission unit that transmits a screen change to a client device according to a controlled transmission method.   A priority transmission screen change information holding unit that holds information of a screen change detected by the priority transmission detection unit, and a priority transmission held in the priority transmission screen information holding unit from a screen change detected by the screen change detection unit As a result of monitoring by the priority transmission screen change monitoring unit that monitors whether or not a screen change should be generated and the priority transmission screen change monitoring unit, a screen change that should be preferentially transmitted is predicted from past screen changes. A priority transmission screen change correction unit that corrects screen information to be transmitted to the client device based on information held by the priority transmission screen change information holding unit when the position or timing does not occur. The screen transfer apparatus according to claim 1.   The priority transmission detection unit learns the screen change detected by the screen change detection unit, and as a result, detects that a screen change to the same region occurs many times during a certain finite time. The screen transfer apparatus according to claim 2, wherein:   The priority transmission detection unit learns the screen change detected by the screen change detection unit, and as a result, detects that the screen change occurs repeatedly at the same time interval during a certain finite time. The screen transfer apparatus according to claim 2, wherein the screen transfer apparatus is a screen transfer apparatus.   The priority transmission detection unit learns the screen change detected by the screen change detection unit, and as a result, detects that a screen change of the same type occurs many times during a certain finite time. The screen transfer apparatus according to claim 2, wherein:   The priority transmission detection unit learns the screen change detected by the screen change detection unit, and as a result, the screen change to the same region occurs many times during a certain finite time, at the same time interval. 4. The method according to claim 2, wherein a combination of at least two of the occurrence of screen changes many times and the occurrence of screen changes of the same type is detected as a rule. Screen transfer device.

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