JP2000316143A - Picture data transmitting device and picture receiving device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a picture data transmitting device for satisfactorily transmitting a picture even when a compact picture data receiving device has a small storage capacity. SOLUTION: An instruction generating part 102 generates an instruction for forming a picture. An execution part 105 executes the generated instruction, and sets the data of a frame memory. An instruction control part 103 specifies a rectangular region including a picture to be formed according to the generated instruction, and generates region information indicating the rectangular region, and stores the region information in a control data storage part 104. A data for specifying part 107 reads the region information from the control data storing part 104, and extracts picture data in a frame memory 106 based on the region information. A data compressing part 108 compresses the region information and the extracted picture data. A transmitting and receiving part 109 transmits the compressed data to a picture data receiving device 150.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for transmitting image data when performing a remote operation or the like, and more particularly, to a case where image data is transmitted from one terminal to another terminal. The present invention relates to a device and an image data receiving device as the other terminal.

[0002]

2. Description of the Related Art Conventionally, when a group located in a place apart from each other (for example, city A and city B) conducts a remote conference using a communication network while viewing a common screen on each terminal. There is. Here, the terminal in the city A is a server device, and the terminal in the city B is a client device. Also,
The server device is executing application design CAD software for displaying graphs and graphics to be referred to from both sides, and controls the client device to display the same screen. In this case, the server device transmits a drawing command for drawing the changed portion of the screen to the client device every time the screen is changed by an operation of the user or the like. On the other hand, the client device receives the drawing command transmitted from the server device and displays it on the screen using the resource data of the client device.

[0003] Here, the "drawing command" means a command generated by the application software for drawing on the display device (these commands differ depending on the system). For example, in the case of the X Window System, "request"
XFillRectangle or the like for filling a specified rectangle. Further, “resource data” refers to data used when rendering based on a rendering command, and corresponds to, for example, font data used when rendering text characters.

FIG. 22 is a block diagram showing functions of each device when transmitting an image from a conventional server device 2200 to a client device 2250. First, the server device 2
The main control unit 2206 of the application 200 reads the execution module of the application software from the application software storage unit 2201, and issues an instruction to display a screen to the drawing instruction generation unit 2202. The drawing command generation unit 2202
In accordance with an instruction from the main control unit 2206, a drawing command necessary for displaying a screen is output to the drawing command processing unit 2203, and the input drawing command is also output to the transmission / reception unit 2205. The drawing command processing unit 2203 processes the drawing command input from the drawing command generation unit 2202, and sets data in the frame memory 2204. The transmission / reception unit 2205 converts the drawing command output from the drawing command processing unit 2203 according to the communication protocol, and converts the drawing command via the communication path to the client device 2250.
Send to

[0005] On the other hand, the transmission / reception unit 2251 of the client device 2250 decodes a drawing command from a signal received via the communication channel, and outputs the drawing command to the drawing command processing unit 2252. The drawing command processing unit 2252 executes the drawing command and sets data in the frame memory 2253. At this time, the main control unit 2257 reads data necessary for executing the drawing command (such as font data necessary for displaying text) from the resource data storage unit 2254 and supplies the data to the drawing command processing unit 2252. Also, the client device 225
The control unit 2257 of 0 receives an operation instruction from the input operation unit 2255 and transmits it to the server device 2200 via the transmission / reception unit 2251.

[0006] Accordingly, main controller 2206 of server device 2200 decodes the instruction command received via transmission / reception unit 2205, and issues an instruction to display a screen corresponding to the instruction instruction to drawing instruction generator 2202. . Here, the “instruction command” refers to a command for notifying a user's command to the application software, for example, an X Winddow System
XButtonPressEvent when the user presses the mouse button.
Is applicable.

As described above, in the conventional image data transmission system, the client device 2250 receives the drawing command transmitted from the server device 2200, and converts the image using the resource data provided in the client device 2250. By displaying, the server device 2200
Transmits the image to the client device 2250 from the client.

[0008]

Recently, an image receiving apparatus such as the above-mentioned client apparatus 2250 has been miniaturized and is portable or an information terminal used at home (for example, a personal computer such as a mobile computer having a palm size for personal use). )
There is a demand to realize this. However, in this case, there is a limit to miniaturization of the receiving device. That is, when transmitting an image via a conventional drawing command, the client device must start the same application software as the server device in order to exchange a common drawing command. Further, in order to decode the drawing command received from the server device and display an image on the display device of the client device, it is necessary to provide hardware and resource data equivalent to those of the server device. Therefore, in order to execute the application software including the resource data, the client device needs to have a storage capacity of several tens Mbytes to one hundred and several tens Mbytes capable of storing font data such as Chinese characters, bitmap data, and the like. .

However, in the above-mentioned small receiving apparatus, since there is naturally a demand for weight reduction and cost reduction, the storage capacity including the main storage is limited, and the OS of the window system is not used.
Execution of large-capacity application software such as
It is difficult to provide advanced drawing functions such as three-dimensional graphics. On the other hand, if an attempt is made to secure a sufficient storage capacity and a configuration that supports drawing commands, it is impossible to simultaneously achieve all the requirements for miniaturization, weight reduction, and cost reduction.

Therefore, the present invention has been made in view of the above-mentioned problems, and the apparatus for receiving an image is small, so that even if the apparatus has a small storage capacity or does not have a configuration that supports a drawing command or the like, It is an object of the present invention to provide an image data transmitting device and an image data receiving device that can transmit images favorably and can reduce costs.

[0011]

In order to achieve the above object, an image data transmitting apparatus according to the present invention transmits image data corresponding to the image to display the image on a display device of the image data receiving apparatus. An image data transmitting apparatus having a frame memory for storing, when receiving an instruction to update a part of the image, area information indicating an area of the image part to be updated and image data corresponding to the image part And transmission means for transmitting the generated area information and the image data to the image data receiving apparatus.

According to another aspect of the present invention, there is provided an image data receiving apparatus having a frame memory for storing image data transmitted from the image data transmitting apparatus. Receiving means for receiving the image data and image data; specifying means for specifying an area in the frame memory based on the area information; and updating means for updating the image data of the area in the specified storage means with the received image data. Prepare.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image data transmitting apparatus and an image data receiving apparatus in an image data transmission system according to the present invention will be described with reference to the drawings. (Embodiment 1) FIG. 1 shows an image data transmitting apparatus (hereinafter, referred to as an image data transmitting apparatus).
It is referred to as a “transmitting device”. 1 is a functional block diagram of a data transmission system 10 including an image data receiving device (hereinafter, referred to as a “receiving device”) 150.
When the application software is executed on the transmission device 100, the system 10 transmits the same image as the image displayed on the display device of the transmission device 100 to the reception device 150. 150 is a system for transmitting an image. In this case, the transmitting device 1
00 transmits only the changed image to the receiving device 150.

The transmitting apparatus 100 includes an application software storage unit 101, a drawing command generation unit 102, a drawing command control unit 103, a drawing control data storage unit 104, and a drawing execution unit 1.
05, frame memory 106, drawing data specifying unit 10
7, data compression section 108, transmission / reception section 109, resource data storage section 110, interrupt timer 111, input operation section 1
12, a display unit 113, and a main control unit 114.

On the other hand, the receiving device 150
1, data decompression unit 152, frame memory control unit 15
3, a frame memory 154, an input operation unit 155, a display unit 156, and a main control unit 157. The following mainly describes the drawing command control unit 103, the drawing control data storage unit 104, the drawing data specifying unit 107, and the frame memory control unit 153 that have functions unique to the present invention. Is only an overview.

First, the configuration of transmitting apparatus 100 will be described. The application software storage unit 101 stores an execution module of the application software executed on the transmission device 100. The application software in this case is, for example, an event-driven program based on the X Window System and has a function of transmitting an image.

The drawing command generator 102 includes a main controller 114
A drawing command for drawing on the display unit 113 is generated in accordance with the instruction command output from the display unit 113, and is output to the drawing command control unit 103. The drawing command in this case corresponds to, for example, a drawing command such as “XFillRectangle” generated in response to a command for “XPressButton” in the case of the X window system.

The drawing command control unit 103 receives the drawing command output from the drawing command generation unit 102 and outputs the drawing command as it is to the drawing execution unit 105, and creates a drawing information table and a queue list from the received drawing command. And stores it in the drawing control data storage unit 104. FIG. 2 is a diagram showing more detailed functional blocks of the drawing command control unit 103. The drawing command control unit 103 includes a drawing information table control unit 201, a queue list control unit 202, and a drawing command decoding unit 203.

The drawing information table control unit 201 receives a drawing command and area information output from the drawing command decoding unit 203, and creates a drawing information table based on these. At this time, the drawing information table control unit 201 determines the priority corresponding to the drawing command with reference to a drawing command registration list described later. Also, the drawing information table control unit 20
1 determines the ascending area numbers in the order in which the drawing commands are received. Further, the drawing information table control unit 201 outputs the priority and the area number to the queue list control unit 202 in the order of receiving the drawing commands.

Here, the "drawing information table" is a data table in which drawing commands and information related to the drawing commands are related and registered in the order in which the drawing commands are received. This drawing information table is used to create a queue list described later. FIG. 3 is a diagram illustrating an example of a configuration of a drawing information table created by the drawing information table control unit 201. In the drawing information table 300, a drawing command 301 and an area number 302, area information 303, a reception time 304, and a transmission identification flag 305 corresponding to the drawing command are registered in order of reception of the drawing command in the drawing command decoding unit 203. .

The area number 302 is a number assigned to each drawing command, and is an ascending number assigned by the drawing information table control unit 201 in the order in which drawing commands are received. Note that the initial value of the area number 302 is “001”. The area information 303 refers to information for representing a rectangular area including a figure drawn by a drawing command, and includes XY coordinates (hereinafter, referred to as X and Y) of a reference point at the upper left corner of the rectangular area.
The four data are the width of the rectangular area in the X direction (hereinafter, represented by W) and the height of the rectangular area in the Y direction (hereinafter, represented by H). The unit of the values of X, Y, W, and H is a pixel (the area information will be specifically described with reference to FIG. 4).

The reception time 304 corresponds to the drawing command decoding unit 203.
The time when the drawing command was received is indicated by "hour", "minute", "second"
Is the time information represented by. Data indicating this time is obtained from the main control unit 114. Also, "hour", "minute",
A value in microseconds having “second” inside the system may be used as it is. The transmission identification flag 305 is used when the drawing data specifying unit 107 outputs the area information and the image data to the data compression unit 108.
7 is a flag set to “1”. Note that the initial value of the transmission identification flag 305 is “0”.

FIG. 4 is a diagram for explaining the contents of the area information. The screen 400 illustrated in FIG.
It is composed of 80 pixels and 1024 pixels in the Y direction. Here, the origin O (0, 0) is set at the upper left corner of the screen 400.
And the coordinates of the point Z at the lower right corner are (1279, 1023). Therefore, the area information of the rectangular area 401 shown in FIG. 4 is X = 500, Y = 300, W = 100, and H = 15.
0. In FIG. 4, “P401” represents a reference point of the rectangular area 401.

As described above, the drawing information table control unit 2
01 is a drawing command 301 from the drawing command decoding unit 203;
Area information 303 and reception time 3 corresponding to this drawing command
04, the area number 302 and the transmission identification flag 305 are added, and these data are registered in the drawing information table. The queue list control unit 202 receives the priority and the region number output from the drawing information table control unit 201, and registers the region number in the queue list. In this case, the area number is registered for each priority.

Here, the “queue list” is a list for controlling the transmission order of the area information and image data transmitted from the transmitting device 100 to the receiving device 150 based on the drawing information table. Mainly, area information and an area number capable of specifying image data are registered. As shown in the drawing information table 300 of FIG. 3, the area numbers correspond one-to-one with the drawing commands 301.

FIG. 5 is a diagram showing an example of a queue list created by the queue list control unit 202.
The queue list 500 includes a first data section 510 and a second data section 520. First data section 510
Is a portion for storing header information necessary for each priority, and is composed of a priority storage area, a lower priority pointer, and an area number pointer. Also, the second data section 520
Is a portion for storing an area number for each priority, and is composed of an area number storage area and an area number pointer.

In the priority storage areas 511 to 513 in the first data section 510, numerical values indicating the priority are stored. The lower priority pointers 514 to 516 are pointers indicating storage locations of lower priorities. For example, the lower priority pointer 514 of the priority “1” indicates the priority “2”.
Storage area 512 is indicated. The area number pointers 517 to 519 are pointers indicating storage areas of the earliest area number in each priority. For example, when the earliest area number at the priority “1” is “006”, the area number pointer 517 points to the area number storage area 521.

The area numbers are stored in area number storage areas 521 to 525 in the second data section 520. The area number pointers 526 to 530 are pointers indicating storage locations of subsequent area numbers. For example, the area number pointer 526 of the area number “006” is
The storage area 523 of the area number “008” is indicated.

Here, the “priority” means the transmitting device 100
Indicates the degree of importance of the area information and the image data to be transmitted to the receiving apparatus 150, and indicates that the smaller the value of the priority is, the more the area information and the image data are transmitted to the receiving apparatus 150 preferentially. I have. The priority is data defined in advance by the user for each drawing command.

FIG. 6 shows an example of a drawing command registration list including priorities defined by the user in advance. As shown in FIG. 6, the drawing command and the priority are defined in advance for each type of drawing command. In the example of FIG. 6, a drawing command used in the X Window System is shown as an example of the drawing command.
"Bitmap".

If there is an area number that exceeds the storage valid time after the reception time, the queue list control unit 202 deletes this area number from the queue list. More specifically, the queue list control unit 202 specifies the reception time corresponding to the area number using the drawing information table, and specifies the type of the drawing command corresponding to the area number using the drawing command registration list. Further, the queue list control unit 202
Specifies the accumulation effective time corresponding to the type of the drawing command using the accumulation effective time registration list, and obtains the current time from the main control unit 114. Through the above procedure, the queue list control unit 202 determines whether or not the area number has exceeded the storage valid time.

Here, the "accumulation effective time" refers to the time during which the area number registered in the queue list continues to be registered as valid data. For example, when a moving image such as an animation is displayed in a certain window, a small value (for example, 1 [second]) is set as the accumulation effective time of the drawing command for the window. This is because, in the case of a moving image, drawing is performed frequently, and it is meaningless to register for a long time. Note that this accumulation effective time is
This is data defined in advance by the user for each drawing command.

FIG. 7 is a diagram showing an example of an accumulation effective time registration list defined in advance by a user. In the example of FIG.
The area number corresponding to the drawing command whose drawing command type is “text” indicates that the drawing command is deleted from the queue list 10 seconds after registration in the queue list 500.
Next, a procedure in which the queue list control unit 202 generates or modifies a queue list will be described with reference to FIG. Here, “generation” mainly means registering an area number in the queue list, and “correction” mainly means deleting the area number from the queue list.

First, the queue list control unit 202
When the first priority and the area number are received from the drawing information table control unit 201, the second priority corresponding to the priority value is received.
The area number is stored in the area number storage area of the data section 520, and the area number pointer of the first data section is set to indicate the area number storage area storing the area number. For example, when data of priority “1” and area number “006” is received from the drawing information table control unit 201, the queue list control unit 202 stores “006” in the area number storage area 521. . Also, the queue list control unit 202 sets the area number pointer 517 of the first data unit 510 so as to point to the storage area 521 of the area number storing the area number “006”.

Next, when the queue list control unit 202 receives the next priority and area number from the drawing information table control unit 201, the queue list control unit 202 stores the next priority and area number in the storage area of the area number corresponding to the priority value as described above. The area number is stored and the area number pointer is set. At this time, if there is an already stored area number in the storage area of the area number corresponding to the reception priority, the received area number is stored after being linked to the area number, and an area number pointer is set. . For example, as the next data, the drawing information table control unit 201
, The queue list control unit 202 stores “008” in the area number storage area 523 and sets the area number pointer 526 to the area number. Is set so as to point to the storage area 523. Similarly, the area number is stored and an area number pointer is set.

On the other hand, when the queue list control unit 202 modifies the queue list, the following procedure is performed. The queue list control unit 202 periodically (for example, every 5 seconds)
In the meantime, all area numbers registered in the queue list 500 are detected in order of priority, a drawing command and a reception time corresponding to the detected area number are specified with reference to the drawing information table, and the storage effective time is specified. The storage validity period corresponding to the specified drawing command is specified with reference to the registration list. Further, the queue list control unit 202 obtains the current time from the control unit 114, and determines whether the sum of the specified reception time and the accumulation valid time has passed the current time.
If the time has elapsed, the queue list control unit 202 changes the destination pointed to by the area number pointer.

For example, the storage area 5 of the detected area number
If the sum of the reception time of the drawing command corresponding to the area number “006” and the accumulation effective time exceeds the current time, the queue list control unit 202
The area number pointer 517 is set to the area number storage area 523.
And delete the corresponding list in the drawing information table. As a result, the area number “0”
06 "has been deleted from the queue list.
In the same way, it is periodically determined whether or not all the area numbers registered in the queue list have exceeded the storage valid time. The timing for making this determination periodically is obtained from the main control unit 114.

As described above, the queue list control unit 20
2 registers an area number for each priority, periodically determines whether or not there is an area number in the queue list that exceeds the storage effective time, and deletes the area number pointer to delete the excess area number. Change settings. The drawing command decoding unit 203 outputs the drawing command received from the drawing command generation unit 102 to the drawing execution unit 105 as it is, decodes the received drawing command, and stores a rectangular area including an image drawn by the drawing command. Information is generated and output to the drawing information table control unit 201.

Here, a method in which the drawing command decoding unit 203 generates the area information from the received drawing command will be described. This method is roughly divided into two methods. 1
First, if the drawing instruction itself contains area information,
In this method, the area information is generated by extracting the area information from the drawing command. The other is a method in which the drawing command itself does not include all the region information, and calculates and generates the region information based on the drawing command.

FIGS. 8 (a) and 8 (b) show examples of a drawing command which includes area information itself and a drawing command which does not include all area information itself. The drawing command 801 (XFillRectangle (d, w, gc, Xa, Ya,
Wa, Ha);) are instructions for painting the inside of the rectangle designated by Xa, Ya, Wa, and Ha black. FIG.
The drawing instruction 811 (XDrawString (d, w, gc,
Xb, Y0, S, L);) is an instruction for displaying a character string having the number of characters indicated by L among the character strings indicated by the pointer of S from the coordinate position designated by Xb, Y0. In addition,
8 (a) and 8 (b), d, w and gc are arguments unique to each drawing command. Regarding the above two drawing instructions, see "X Window Handbook" (edited by Toru Nishimura,
The details are described in ASCII Publishing Bureau).

In the case of the drawing command 801 shown in FIG. 8A, the drawing command itself includes arguments 805 to 808 (Xa, Ya, Wa, Ha) corresponding to the four pieces of information of the area information 303. Extract these values. On the other hand, FIG.
In the case of the drawing command 811 shown in FIG.
And Y0 are defined as arguments Xb and Y0,
Arguments corresponding to W and H in the area information are not included.
Therefore, it is necessary to separately generate values corresponding to W and H of the area information. For example, when the character string to be drawn by the drawing command 811 is “Graph 1” and the width of each character is 9 pixels and the height (H) is 15 pixels, the entire character string “Graph 1” The area information Wb is 36 pixels and Hb is 9 pixels. In the drawing command 811 of FIG. 8B, when the value of Y0 indicates the Y value of the lower left corner of the first character in the character string, for example, a correction such as "Yb = Y0-8" is required. is there.

The drawing control data storage unit 104 stores the above-described drawing command registration list and storage valid time registration list, as well as the drawing information table and queue list created by the drawing command control unit 103. Drawing execution unit 105
Executes the drawing command output from the drawing command control unit 103, and stores the frame memory 10 corresponding to the drawn image.
6 is updated. In this case, the drawing execution unit 105
Uses the resource data supplied from the resource data storage unit 110 via the main control unit 114 when executing the drawing command.

The frame memory 106 is a storage device composed of a RAM or the like, and stores image data corresponding to individual pixels. At this time, the image data is stored for each pixel in a row unit. Therefore, X = 0, Y =
The image data corresponding to the pixel at the position 1 is 1
281st is stored. The drawing data specifying unit 107 specifies the area information and the image data to be transmitted first by using the drawing information table and the queue list of the drawing control data storage unit 104.

FIG. 9 is a diagram showing more detailed functional blocks of the drawing data specifying unit 107. The drawing data specifying unit 107 includes an area information specifying unit 901, an image data specifying unit 902, and a drawing data combining unit 903.
The area information specifying unit 901 detects an area number in the queue list in order from the priority “1” based on the area number pointer. If the priority area number pointer is not defined (indicated by “-” as in the area number pointer 519 in FIG. 5), the priority is shifted to the lower priority, that is, the priority “2”. Similarly, an attempt is made to detect the area number.
When the area number is detected, the area information specifying unit 901
It is determined whether or not the transmission identification flag corresponding to the detected area number is “0” with reference to the drawing information table. If the transmission identification flag is “0”, the area information corresponding to the area number is specified, and the specified area information is stored in the image data specifying unit 90.
Output to 2. In this case, the area number specifying unit 901 changes the transmission identification flag in the drawing information table corresponding to the detected area number to “1”.

On the other hand, when the transmission identification flag corresponding to the detected area number is “1”, the area information specifying unit 901
Attempt to detect the next area number. Image data specifying unit 902
Has a buffer for storing image data therein, and reads out image data in a rectangular area specified by the area information from the image data in the frame memory 106 into the internal buffer.

The drawing data synthesizing section 903 generates drawing data based on the area information specified by the area information specifying section 901 and the image data specified by the image data specifying section 902, and sends the generated data to the data compression section 108. Output. FIG. 10 shows an example of the drawing data generated by the drawing data synthesis unit 903 and output to the data compression unit 108. As shown in FIG. 10, drawing data 1
000 is a header 1001, X1002, Y1003,
W1004, H1005, number of bytes of image data 100
6. It is composed of image data 1007.

The header 1001 is data for identifying the start of drawing data, and stores, for example, hexadecimal data FFH. X1002, Y1003, W
1004 and H1005 are the area information 30 as described above.
3, four data. 100 bytes of image data
Numeral 6 is a numerical value expressing the size of the image data by the number of bytes. The image data 1007 is stored in the image data specifying unit 902
Is the actual image data specified from the frame memory 106 by the

The data compression unit 108 compresses the image data and transmits the compressed data together with the area information to the transmission / reception unit 10.
9 is output. The transmission / reception unit 109 includes a data compression unit 108
Receiving the compressed data output from the
Send to 50. The resource data storage unit 110 stores data used when rendering based on a rendering command, and stores, for example, font data used when rendering text characters.

The interrupt timer 111 is a timer that is started by the main control unit 114, measures the current time, the elapsed time of the accumulation valid time, and provides the result to the main control unit. The input operation unit 112 receives an instruction from an operator using a keyboard, a mouse, or the like. The display unit 113 displays the drawn contents by executing application software or the like.

The main control unit 114 controls the entire transmission apparatus 100 and issues an instruction to the drawing instruction generation unit 102 based on the instruction output from the input operation unit 112.
Further, the main control unit 114 instructs the transmission / reception unit 109 to transmit the compressed image data. Further, the interrupt timer 111 is started to obtain the current time, the elapsed time of the accumulation effective time, and the like.

Next, the configuration of the receiving device 150 will be described. The transmission / reception unit 151 receives the data transmitted from the transmission device 100, decodes the data, and outputs the decoded data to the frame memory control unit 153. The data decompression unit 152 decompresses the image data output from the frame memory control unit 153 and outputs the data to the frame memory 154.

The frame memory control section 153 receives the data output from the transmission / reception section 151 and identifies the area information and the image data. In this case, the frame memory control unit 153 controls the header 10 in the drawing data 1000.
The area information is identified such that the second to ninth bytes counted from the beginning of 01 are the area information, and the 13th byte and subsequent bytes counted from the beginning of the header 1001 are the image data.
Further, the frame memory control unit 153 specifies the location of the frame memory 154 to be updated based on the identified area information, and rewrites the content of the specified location by expanding the image data 1007 with the data expansion unit 152. For example, in the case of the rectangular area 401 shown in FIG.
With the address 0 × Y (ie, 300) + X (ie, 500)) as the start address, the image data for W (ie, 100) pixels is rewritten H (ie, 150) times every 1280.

The input operation unit 155 receives an instruction from an operator using a keyboard, a mouse, or the like. Display 156
Displays the same content as the display unit 113 of the transmission device 100. The main control unit 157 is a part that controls the entire receiving device 150, and issues an instruction to the transmission / reception unit 151 and the data decompression unit. Next, the operation in the present embodiment will be described with reference to FIG.
This will be described with reference to FIGS. 11 and 12
Shows a state where the display content of the screen is changed by the operation of the user on the transmission device 100 side.

When the user on the transmitting apparatus 100 presses the select 1 button 1101 on the screen of FIG. 11, the select 1 button 1101
The state changes to a pressed state as indicated by 201. Further, the bar graph 1101 and the display 1103 of “Graph 1” are partially blacked out like the bar graph 1202 in FIG.

Further, on the screen of FIG.
When the user on the 00 side performs an operation of lowering the scroll bar 1111 downward, the display of the scroll bar changes downward as shown in FIG.
The position of the list content displayed in 12 moves downward.
FIG. 13 illustrates a pressing operation of the selection 1 button 1101 and a scroll bar 11 input by the user of the transmitting apparatus 100 side.
11 lowers the drawing command generator 102
Command decoding unit 203 based on the drawing command generated in
Indicates a rectangular area specified by.

The rectangular areas 001 and 002 are
A rectangular area that is newly blacked out to represent a shadow of the selection 1 button 1101 based on a drawing command generated by a pressing operation of the selection 1 button 1101 by the user on the 00 side is shown. On the other hand, rectangular areas 003 and 004 indicate rectangular areas in which drawing for restoring the shadow of the selection 1 button 1101 is performed based on a drawing command similarly generated by pressing the selection 1 button 1101.

Further, the rectangular area 005 is
The rectangular area that is newly blacked out in the bar graph 1202 when the user 1 presses the select 1 button 1101 is shown. Further, a rectangular area 006 indicates a rectangular area for drawing a character “Graph 1” inverted by the operation of pressing the select 1 button 1101. Furthermore,
The rectangular area 007 indicates a rectangular area including the scroll bar that has been moved by the operation of lowering the scroll bar 1111 by the user on the transmission device 100 side. A rectangular area 008 indicates a rectangular area for drawing a list widget whose display area has been moved downward by the same operation of lowering the scroll bar 1111 below.

FIG. 14 is a flowchart showing the flow of processing relating to the generation of the drawing information table 300 and the queue list 500 in this embodiment. First, the main control unit 114 starts application software and outputs an instruction command to the drawing command generation unit 102 to display an initial screen (S1401, S1402). Thereafter, the main control unit 114 transmits the image data relating to the initial screen to the receiving device 15.
0 to the transmission / reception unit 109 (S140).
3). Further, the main control unit 114 outputs an instruction command to the drawing command generation unit 102 every time an operation or the like by the user of the transmission device 100 is received.

Next, the drawing command generator 102 determines whether there is an instruction command from the main controller 114 (S140).
4) If there is an instruction command, decode the instruction command (S
1405), a drawing command corresponding to the instruction command is generated and output to the drawing command control unit 103 (S1406). Accordingly, the drawing command control unit 103 decodes the drawing command (S1).
407), a drawing information table and a queue list are created based on the drawing command (S1408, S140).
9). Here, the drawing command control unit 103 registers information on each drawing command in the drawing information table with respect to all drawing commands output from the drawing command generation unit 102, and stores an area number corresponding to each drawing command. (S1407 to S1)
410).

Each time the drawing command generation unit 102 receives a command from the main control unit 114, it repeats the process of decoding the command and generating the drawing command (S1405, S1405).
1406, S1411). Finally, the main control unit 114
Until the application software ends, the transmission device 1
The standby of the operation or the like by the user on the 00 side is continued (S
1412).

FIG. 15 is a flowchart showing a more detailed processing flow of the subroutine "queue list creation / correction processing (S1409)" in FIG.
First, the queue list control unit 202 performs, as initialization processing, the first data unit 51 serving as header information for each priority.
0 is created (S1501). Next, the queue list control unit 202 receives the priority and the area number output from the drawing information table control unit 201 (S1502),
Register the area number for each priority in the queue list (S1
503).

Further, the queue list control unit 202
For each area number in the queue list, it is periodically checked whether or not the storage effective time has been exceeded, and the excess area number is deleted from the queue list (S1504 to S1504).
S1513). At this time, the queue list control unit 202
Shows the procedure for deleting the area number from the queue list.

(1) The presence / absence of an area number of priority “1” is sequentially searched, and a drawing command and a reception time of the detected area number are specified using a drawing information table (S1505, S15).
06). (2) Referring to the drawing command registration list, the “drawing command type” is specified from the specified drawing commands (S1507).

(3) Referring to the storage valid time registration list,
The storage validity time is specified from the type of the specified drawing command (S1508). (4) Compare the current time with the specified reception time, and delete from the queue list the area number that has been registered over the storage valid time corresponding to the area number (S1509 to S1512). .

Thereafter, when the above processing is completed for all the area numbers in the queue list (S151)
3) Return to the original processing. FIG. 16 shows the drawing data in the present embodiment, and the drawing data is received by the receiving device 15.
7 is a flowchart illustrating a flow of processing until transmission to 0 is performed. First, the area information specifying unit 901 detects the earliest area number from the queue list in order of priority (S1601,
S1602), the area information corresponding to the detected area number is read from the drawing information table (S1603).

Next, the image data specifying unit 902 extracts image data based on the read area information (S1).
604), the image data is stored in a buffer for storing the image data. Further, the image data specifying unit 902 calculates the number of bytes of the extracted image data (S1605). As a result, the drawing data synthesizing unit 903 sets the area information specifying unit 9
01 and the image data specifying unit 902
Then, the image data identified by the above and the number of bytes of the image data are combined and output to the data compression unit 108. Data compression unit 1
08 compresses the data output from the drawing data synthesis unit 903 and outputs the compressed data to the transmission / reception unit 109 (S160)
6). The transmission / reception unit 109 transmits the compressed data to the reception device 150 (S1607).

Finally, the main control unit 114 repeats the above processing until the application software ends (S
1601 to S1608). As described above, according to the image data transmitting apparatus and the image data receiving apparatus according to the present embodiment, of the images displayed on the image data transmitting apparatus, the rectangular area including the changed image and the image data in the rectangular area And transmits the image data to the image data receiving device.Therefore, even if the image data receiving device does not have a configuration for supporting a drawing command or the like, or if the storage capacity for resource data and the like is small, the image is Can be sent appropriately,
Cost reduction can be achieved.

In this embodiment, the queue list control unit 202 is configured to determine whether or not the storage effective time has been exceeded for the area number registered in the queue list. When detecting the area number from the queue list, the area information specifying unit 901 determines whether or not the area number has exceeded the storage valid time, discards the excess area number, and You may comprise so that a number may be detected. (Embodiment 2) In the present embodiment, while the embodiment 1 registers the area numbers in the queue list for each priority, the area numbers are registered by dividing the area numbers at certain time intervals. Is different.

More specifically, in this embodiment,
By dividing the area numbers to be registered in the queue list at fixed time intervals, and identifying and transmitting the image data corresponding to the area numbers divided at each of the fixed time intervals, it becomes meaningful because time has elapsed. The transmission of the lost image data to the receiving device 150 is excluded. For example, when transmitting a moving image that changes every moment, such as a moving image of a television phone, it is necessary to secure a certain degree of synchronism between the transmitting side and the receiving side, and image data that lacks synchronism significantly Cannot communicate with each other, resulting in meaningless image data. Therefore, in the present embodiment, in order to ensure a certain degree of synchronism between the transmitting side and the receiving side, the area numbers are divided at certain time intervals, registered in a queue list, and specified image data to be transmitted. Also, when searching for an area number from the queue list, the search is performed for each section of this fixed time interval.

The components in the present embodiment are the drawing information table control unit 201 in FIG. 2 of the first embodiment.
And the function of the queue list control unit 202, the configuration of the queue list 500 in FIG. 5, and the function of the area information specifying unit 901 in FIG. The following description focuses on the differences.

The drawing information table control unit (not shown) according to the present embodiment is configured such that the drawing information table control unit 201 according to the first embodiment sends the priority and area number corresponding to the drawing command to the queue list control unit. The output is the same, but the output of the priority and the area number is collectively performed at fixed time intervals (for example, at intervals of 5 seconds). At this time, the drawing information table control unit according to the present embodiment adds time data indicating the timing of collective output before the priority and the area number, and outputs the data to the queue list control unit. In addition,
The interval time is a time set in advance by the user.

The details of the function of the drawing information table control unit in this embodiment will be described below with reference to the drawing information table 300 in FIG. The drawing information table control unit outputs the time data, the priority, and the region number to the queue list control unit at preset intervals of 5 seconds. Therefore, in the case of FIG. 3, since eight drawing commands are received during the reception time “09:00:00 to 09:00:00”, “time data (09,00, 00), priority (1), area number (006), priority (1), area number (008), priority (2), area number (001), priority (2), area number (002) , Priority (2), area number (003), priority (2), area number (004), priority (2), area number (005), priority (2), area number (007) '' -Output the data having the structure (1) to the queue list control unit.

The queue list control unit (not shown) in the present embodiment generates a queue list to which time data has been added based on the time data, priority and area number received from the drawing information table control unit. create.
FIG. 17 illustrates an example of a configuration of a queue list to which time data is added, which is created by the queue list control unit according to the second embodiment.

In the first embodiment, the queue list 5
00, the first data section 510 includes a priority storage area, a lower priority pointer, and an area number pointer.
The data section 1710 includes time data storage areas 1701 to 1703, time data pointers 1704 to 1706, and priority pointers 1707 to 1707 as higher-order header information.
1709 is added.

Time data storage areas 1701 to 1703
Stores a numerical value indicating the time output from the drawing information table control unit. Time data pointers 1704 to 17
06 is a pointer indicating the storage area for the next time data. For example, the time data pointer 1704 in FIG.
Indicates a time data storage area 1702.
The priority pointers 1707 to 1709 are pointers indicating storage areas of the priority “1” corresponding to the respective time data.

Next, a procedure for the queue list control unit in this embodiment to create a queue list to which time data has been added will be described with reference to FIGS. In the following, a description of a part common to the procedure in which the queue list control unit 202 in the first embodiment creates the queue list 500 will be omitted. First, when the queue list control unit receives time data and one or more sets of priority and area number data from the drawing information table control unit, the queue list control unit stores the time data in the time data storage area, and sets the priority pointer. The setting is made so as to indicate the storage area of the priority “1”. For example, when the data of the above (1) is received from the drawing information table control unit, the queue list control unit stores the time data (09,00,00) in the time data storage area 1701 and stores the priority pointer 1707
Is set to indicate the storage area 1711 of the priority “1”. Further, the queue list creating unit sequentially registers the area numbers based on the received priority and the area numbers. The procedure for registering and correcting the area number is the same as the procedure in the first embodiment.

Next, when the queue list control unit receives the next time data and one or more sets of priority and area number data from the drawing information table control unit, the queue list control unit stores the time data in the next time data storage area. At the same time, the time data pointer is set so as to point to the storage area of the next time data. Further, the queue list control unit sets the priority pointer corresponding to the next received time data so as to point to the storage area having the priority “1”. For example,
From the drawing information table control unit, `` Time data (09,00,05), priority (2), area number (009), priority (2) area number (010), priority (2), area number (011), priority (2), area number (012) ”... (2), the queue list control unit stores the time data (0
9,00,05) and the time data pointer 170
4 is set to indicate the storage area 1702 for the next time data. In addition, the queue list control unit sets the priority pointer 1708 so as to point to the storage area 1712 having the priority “1”.

Thereafter, each time time data and one or more sets of priorities and area numbers are received from the drawing information table control unit, the same processing as described above is performed. As described above, the queue list control unit according to the present embodiment registers the area number in the queue list at regular time intervals based on the time data, priority, and area number received from the drawing information table control unit. I do.

The area information specifying section (not shown) in the present embodiment is the area information specifying section 9 in the first embodiment.
Compared with 01, a timer for specifying area information is newly provided. Further, the area information identification unit identifies the first time data with reference to the queue list, and starts a timer for area information identification in accordance with the time of the time data. further,
The area information specifying unit searches the area number sequentially from the priority “1” with reference to the queue list, specifies the area information corresponding to the detected area number, and specifies the image data specifying unit 902.
Output to At this time, the area information identification unit always compares the next time data in the queue list with the time of the area information identification timer, and the time of the area information identification timer matches the time of the next time data. In this case, the detection target is shifted to the area number registered as the next time data section.

The details of the function of the area information specifying unit will be described below with reference to FIG. First, the area information specifying unit identifies the earliest time data 1701, and activates the area information specifying timer in accordance with “09, 00, 00”. Next, the area information specifying unit sets the priority pointer 1
Area number pointer 1721 of priority “1” indicated by reference numeral 707
Is specified as the area number “006”. Further, the area information specifying unit specifies the area information based on the detected area number, and transmits the specified area information to the image data specifying unit 902, similarly to the area information specifying unit 901 of the first embodiment.

Further, when the time has elapsed, the time measured by the area information specifying timer is changed to the next time data storage area 1.
If the time coincides with the time “09, 00, 05” indicated by the time data 702,
Even if there is an area number that has not been detected yet among the area numbers classified by “0000”, the detection target is forcibly shifted to the area number classified by the time data “09, 00, 05”. .

As described above, according to the image data transmitting apparatus and the image data receiving apparatus according to the present embodiment, when registering the area numbers in the queue list, the area numbers are divided at regular time intervals. register. Further, when searching for an area number from the queue list, the image data that has become meaningless due to the lapse of time is transmitted to the receiving device 150 because the search is performed by shifting to the next section at regular time intervals. Can be eliminated. (Embodiment 3) In this embodiment, the image data corresponding to each drawing command is individually transmitted in the first embodiment, but when the images to be drawn overlap, these image data are collectively collected. Is different.

More specifically, in this embodiment,
If the rectangular area specified by the low-priority area number is included in the rectangular area specified by the high-priority area number, the image data of the rectangular area specified by the high-priority area number includes The image data is transmitted to the receiving device 150 including the image data of the rectangular area specified by the area number having the lower priority. Here, “inclusion” refers to a case where one rectangular area completely includes the other rectangular area.

The components in the present embodiment include:
Queue list control unit 202 in FIG. 2 of the first embodiment
However, since the other components are the same, the description of the same points will be omitted, and the description will focus on the queue list control unit having different functions. The queue list control unit (not shown) according to the present embodiment includes the area information specified by the priority newly received from the drawing information table control unit and the newly received area number, and the queue list already stored in the queue list. Based on the priority and area information specified from the registered area number, the inclusion relation is checked for each rectangular area, and the rectangular area corresponding to the high priority area number corresponds to the low priority area number If a rectangular area is included, a low priority area number is not registered in the queue list or deleted from the queue list. The above-mentioned "processing of checking whether or not there is an inclusion relationship from the two area information and not registering the area number corresponding to the included rectangular area in the queue list or deleting it from the queue list" This is referred to as "determination processing." Details of the inclusion determination processing will be specifically described with reference to FIG.

FIGS. 18A and 18B are diagrams for explaining the inclusion judgment processing of the queue list control unit in the third embodiment. FIG. 18A is a diagram showing an example of three types of area numbers and area information corresponding to each of the information registered in the drawing information table. Note that FIG.
Area numbers 1801 to 1803 and area information 1 in (a)
811 to 1813 correspond to the drawing information table 30 in FIG.
An example of an area number 302 and area information 303 at 0 is extracted and shown. The priority of the area number 1801 in FIG. 18A is higher than the priority of the area number 1802, and the priority of the area number 1801 and the priority of the area number 1803 are the same.

FIG. 18B is a diagram showing a rectangular area formed based on the area information of FIG. 18A on the screen.
For example, the rectangular area 1801 is a rectangular area configured based on the area information corresponding to the area number 1801. As shown in FIG. 8B, the rectangular area 1802 is the rectangular area 1
801 and are in the above-mentioned "included" relationship.

Therefore, in the case of FIGS. 18A and 18B, since the rectangular area 1802 is included in the rectangular area 1801 and the priority of the area number 1802 is lower than the priority of the area number 1801, the queue list The control unit changes the area number pointer as described above to delete the area number 1802 from the queue list. On the other hand, the rectangular area 180
No. 3 is not included in the rectangular area 1801 and does not have the above-mentioned “inclusion” relationship. Therefore, the queue list control unit:
The area number 1803 in the queue list is left as it is.

Next, the inclusion determining process in the queue list control unit of the present embodiment will be described with reference to the flowchart of FIG. FIG. 19 is a flowchart illustrating the flow of the inclusion determination process in the queue list control unit according to the present embodiment. First, when the queue list control unit according to the present embodiment newly receives a priority and an area number from the drawing information table control unit, the queue list control unit of the earliest area number registered in the queue list as initialization processing. The identification is performed (S1901 to S1903). here,
“I” is an identifier indicating the newly received area number. "Variable j" is a variable indicating the detection order of the area numbers already registered in the queue list.

Next, the queue list control unit specifies area information corresponding to the newly received area number and priority and area information corresponding to the j-th detected area number using the drawing information table. (S1904). further,
The queue list control unit determines that the newly received priority is j
If it is determined that the priority is higher or equal to the priority corresponding to the region number detected at the jth, the rectangle corresponding to the region number newly detected is added to the rectangle corresponding to the region number detected at the jth position. It is determined whether the area is included (S1906 to S1909). If it is determined that the area number is included, the queue list control unit deletes the j-th detected area number from the queue list (S1910).

On the other hand, if the priority corresponding to the j-th detected area number is higher than the newly received priority, the new reception is performed in the rectangular area corresponding to the j-th detected area number. It is determined whether or not a rectangular area corresponding to the area number is included (S1911 to S1914).
If it is determined that the area number is included, the queue list control unit does not register the newly accepted area number in the queue list (S1915).

The above processing is executed for all area numbers registered in the queue list (S1902 to S1902).
1916). As described above, when registering the area number in the queue list, the queue list control unit in the present embodiment has already registered the rectangular area corresponding to the newly accepted area number and the queue area. Determine the inclusion relationship with the rectangular area corresponding to the area number, and if the rectangular area is the included rectangular area and the priority is low, do not register the area number corresponding to this rectangular area in the queue list Is included in the queue list. Thus, after transmitting the image data corresponding to the high-priority rectangular area, the image data corresponding to the low-priority rectangular area is transmitted again despite being included in the high-priority rectangular area. Thus, transmission of redundant area information and image data can be avoided.

As described above, in the present embodiment, by adding the inclusion determination processing to the queue list control unit, the image data transmitting apparatus 100 can transmit the image data receiving apparatus 150.
When transmitting the area information and the image data to be transmitted, the transmission of the duplicated area information and the image data is eliminated, and the image can be transmitted efficiently. (Embodiment 4) In the present embodiment, the image data corresponding to each drawing command is individually transmitted in the first embodiment, but when the images to be drawn are close to each other, the image data is collectively collected. Sending is different.

More specifically, in the third embodiment,
When transmitting image data of two rectangular areas that are close to each other, it is possible to enlarge the rectangular area and transmit image data of two nearby rectangular areas at one time. More specifically, when a rectangular area specified by a low priority area number exists near a rectangular area specified by a high priority area number, the rectangular area is specified by a high priority area number. The rectangular area specified by the high-priority area number is corrected so that the rectangular area includes the rectangular area specified by the low-priority area number, and image data specified by the corrected rectangular area is received. Transmit to the device 150. Where "nearby"
"It means that one rectangular area and the other rectangular area exist at a certain distance.

The components of this embodiment differ in the function of the queue list control unit 202 in FIG. 2 of the first embodiment, but the other components are the same. The following description focuses on the queue list control units having different functions. The queue list control unit (not shown) according to the present embodiment includes the area information specified by the priority and the area number newly received from the drawing information table control unit, and the area registered in the queue list. It is checked whether or not there is a neighborhood relation based on the priority and the area information specified from the number (that is, whether or not the rectangular area specified from each area information has a neighborhood relation). In the case of the relationship, the rectangular area specified by the high-priority area number is modified so that the rectangular area corresponding to the high-priority area number includes the rectangular area corresponding to the low-priority area number. The area number having a lower priority in the neighborhood relation is not registered in the queue list or is deleted from the queue list. In addition, the queue list control unit corrects the area information so as to correspond to the corrected rectangular area in the drawing information table. The above-described process of “examining a neighborhood relationship from two region information and not registering a region number having a low priority in the neighborhood relationship in the queue list or deleting it from the queue list” is referred to as “neighborhood determination process”. Name. The details of the proximity determination process will be specifically described with reference to FIG.

FIGS. 20A to 20C are diagrams for explaining the neighborhood judging process of the queue list control unit in the fourth embodiment. FIG. 20A shows two of the drawing information tables.
It is a figure showing an example of a kind of area number and area information corresponding to each. FIG. 20B is a diagram showing a rectangular area configured based on the area information 2011 and 2012 of FIG. 20A on a screen. In this case, the priority of the area number 2001 is higher than the priority of the area number 2002. Further, in the present embodiment, when the mutual rectangular area exists within 20 pixels, the “nearby”
It is determined that the relationship is satisfied.

As shown in FIG. 20B, the rectangular area 200
1 and the rectangular area 2002 exist at a distance of 15 pixels, and have the above “neighborhood” relationship. Since the priority of the area number 2001 is higher than the priority of the area number 2002, the queue list control unit corrects the area information corresponding to the rectangular area 2001 in the drawing information table so as to include the rectangular area 2002. . In addition, the queue list control unit deletes the area number 2002 from the queue list.

FIG. 20 (c) shows the “neighborhood determination process”
The corrected area information 2013 corresponding to the corrected rectangular area 2001 is shown. As shown in the figure, the area information 2013 includes the X, Y,
The values of W and H are shown. Next, the proximity determination processing in the queue list control unit of the present embodiment will be described with reference to the flowchart in FIG.

First, upon receiving a new priority and area number from the drawing information table control unit, the queue list control unit in this embodiment specifies the earliest area number registered in the queue list. (S2101 to S210)
2103). Here, “i” is an identifier indicating a newly received area number. "Variable j" is a variable indicating the detection order of the area numbers already registered in the queue list.

Next, the queue list control unit specifies area information corresponding to the newly received area number and priority and area information corresponding to the j-th detected area number using the drawing information table. (S2104). further,
The queue list control unit determines that the newly received priority is j
When it is determined that the priority is higher or equal to the priority corresponding to the area number detected at the second time (S2111), the rectangular area corresponding to the newly received area number and the area number at the j-th time are determined as the area number. It is determined whether or not there is a neighborhood relationship with the corresponding rectangular area. If it is determined that there is a neighborhood relationship, the queue list control unit corrects the area information corresponding to the newly received area number so as to include the rectangular area corresponding to the j-th detected area number. The area number detected the third time is deleted from the queue list (S21).
05 to S2113).

On the other hand, if the priority corresponding to the j-th detected area number is higher than the newly received priority (S2111), the area information corresponding to the j-th detected area number is set as follows. It is corrected to include the rectangular area corresponding to the newly received area number, and the newly received area number is not registered in the queue list (S2114,
S2115).

The above processing is performed for all the area numbers registered in the queue list (S2102 to S2).
2116). Note that the equation “Xi 数 式 Xj” in FIG.
Represents the smaller value of Xi and Xj. The expression “(Xi + Wi−XT) ▽ (Xj + Wj−XT)” is calculated as (Xi + Wi
−XT) and (Xj + Wj−XT), whichever is greater.

As described above, when registering the area number in the queue list, the queue list control unit in the present embodiment registers the rectangular area corresponding to the newly received area number and the rectangular area already registered in the queue list. A rectangular relationship corresponding to a region number having a high priority is determined so as to include a rectangular region having a low priority among the two rectangular regions determined to be close to each other. There is provided a neighborhood determination process in which an area is corrected and a low priority area number is not registered in the queue list or deleted from the queue list.

As described above, in the present embodiment, the “neighborhood judgment processing” provided in the queue list control unit modifies the high-priority rectangular areas so as to include the low-priority rectangular areas. Since the image data corresponding to the specified rectangular area is transmitted, the number of transmissions of the area information and the image data transmitted from the image data transmitting apparatus to the image data receiving apparatus can be reduced.

In the above embodiment, the storage effective time for each type of drawing command is registered in the storage effective time registration list, and when it is determined whether or not the area number exceeds the storage effective time, the storage time is determined. Although the configuration is such that the storage valid time registration list is referred to each time, when registering the area number in the queue list, the storage valid time is associated with each area number and registered, and the above-described excess is determined. In such a case, a configuration may be adopted in which the registered effective storage time is referred to. Specifically, the data of the second data section 520 shown in FIG. 5 is configured as “area number + storage effective time + area number pointer”.

In the above embodiment, the functions are shared between the image data transmitting apparatus and the image data receiving apparatus. However, each of them has an image data transmitting function and an image data receiving function. You may. Further, in the above embodiment, the image data receiving apparatus 150 generates and transmits an instruction command so that the user of the image data receiving apparatus 150 can remotely control the image data transmitting apparatus 100. To generate a drawing command.

Finally, it goes without saying that the image data transmitting method and the image data receiving method according to the present invention can be realized as a program executed on a general-purpose computer system. Therefore, the image data transmitting method and the image data receiving method according to the present invention can be stored in a recording medium such as a CD-ROM and distributed.

[0107]

As is apparent from the above description, the image data transmitting apparatus according to the present invention has a frame for storing image data corresponding to the image in order to display the image on the display device of the image data receiving apparatus. An image data transmitting apparatus having a memory, wherein, when receiving an instruction to update a part of the image, the apparatus generates area information indicating an area of the image part to be updated and image data corresponding to the image part And transmitting means for transmitting the generated area information and the image data to the image data receiving apparatus.

Thus, when a part of the image is updated in the image data transmitting apparatus, the area information indicating the area of the image and the image data corresponding to the area are transmitted to the receiving side. The image can be easily reproduced based on the image data, and even if the image data receiving apparatus does not have a small storage capacity and does not have a configuration that supports a drawing command or the like, the image can be transmitted appropriately. Cost reduction can be achieved.

The generating means includes: a command receiving unit for receiving a drawing command for updating image data of a part of the frame memory;
A generating unit that generates region information of the image portion; an updating unit that executes a drawing command to update image data in the frame memory; and image data corresponding to the generated region information in the updated frame memory. And an extraction unit for extracting the information.

As a result, the region information for specifying the image data of the image portion to be updated is generated based on the drawing command for updating the portion of the image. It can be specified appropriately. Further, the generating unit generates by extracting area information indicating a rectangular area from the drawing command,
Or, it is generated by calculating area information indicating a rectangular area from the drawing command, and the extracting unit extracts image data in the extracted or calculated rectangular area in the updated frame memory. You may comprise.

Thus, based on the drawing command, the area information of the rectangular area for specifying the image data to be updated is extracted or generated, so that the area information indicating a suitable rectangular area corresponding to the drawing command is specified. be able to. The image data transmitting apparatus may further include: a priority determining unit that determines a priority indicating the importance of the drawing command for each drawing command; and identifies an order in which the drawing commands are received, and the drawing commands are received in ascending order. A number determination unit that determines the area number of the image data, a table section having a storage section for storing the drawing command, the area number, and the area information in association with each other, and a storage section for storing the priority and the area number in association with each other. A list section, the received drawing command, the determined area number,
A table control unit for storing the generated area information in association with the table unit, and a list for storing in the list unit the priority determined for the accepted drawing command and the determined area number in association with each other A control unit, wherein the extraction unit, from the list unit, a number identification unit that identifies an area number according to priority, based on the identified area number, an information reading unit that reads out area information from the table unit. ,
The updated frame memory may include a data extracting unit that extracts image data in a rectangular area indicated by the area information read according to the priority.

As a result, the area number corresponding to the drawing command on a one-to-one basis is specified in accordance with the priority, and the image data is specified based on the specified area number. The image data can be transmitted to the image data receiving apparatus. Further, the image data transmitting device includes a time specifying unit that specifies a reception time indicating a time at which the drawing command was received, and a timer unit that measures a current time, and the table unit further displays the reception time. The table control unit further stores a drawing command and a reception time in the table unit in association with each other, and the list control unit further includes: A number reading unit that reads an area number from the list unit in accordance with the priority, a table reading unit that reads a drawing command and a reception time from a table unit based on the read region number, and a drawing command that effectively exists. A time determining unit that determines the accumulation effective time indicating the continuation time for the read drawing command, and obtains the current time from the timer unit, and reads the received reception time and the read drawing command. A determination unit that determines whether the sum of the storage valid time determined by the above is greater than the current time, and, when it is determined that the current time is exceeded, reading from the list unit related to the determination. And a correction unit that deletes the set area number.

As a result, since the area number corresponding to the rendering command which has become meaningless after the lapse of the storage effective time is deleted from the queue list, it is possible to avoid specifying the meaningless area number. It is possible to avoid transmitting lost image data to the image data receiving device. Furthermore, the image data transmitting device further includes a time specifying unit that specifies a reception time indicating a time at which the drawing command was received, and a timer unit that measures the current time, and the table unit further includes a drawing command A storage section for storing the reception time in association with the reception time; the table control unit further stores the received drawing instruction and the specified reception time in the table unit in association with each other; A temporary reading unit for temporarily reading an area number from the list unit in accordance with the priority; and a table reading unit for reading a drawing instruction and a reception time from a table unit based on the temporarily read area number. For the read drawing command, a time determination unit that determines an accumulation valid time indicating a time during which the drawing command continues to exist effectively, and a current time obtained from the timer unit, A determination unit for determining whether or not the sum of the time and the determined storage effective time has exceeded the current time, and when it is determined that the time has not exceeded, the area number temporarily read is determined. It may be specified.

In this way, when specifying the image data of the image portion to be updated, it is determined whether or not the area number corresponds to a drawing command that has become meaningless due to the passage of time. It is possible to avoid transmitting image data corresponding to the region number that has disappeared to the image data receiving device. In addition, the image data transmitting device determines, for each drawing command, a time specifying unit that specifies a reception time indicating a time when the drawing command is received, and a storage valid time that indicates a time during which the drawing command continues to exist effectively. A time determination unit, comprising a timer unit that measures the current time, the table unit further has a storage column of the reception time to store the reception time in association with the drawing command, the table control unit, Further, the table unit stores the received drawing command and the reception time in association with each other, and the list unit further stores a storage effective time storage column for storing the storage effective time in association with the area number. The list control unit further stores, in the list unit, the area number determined for the accepted drawing command and the storage effective time in association with each other. A list reading unit that reads an area number according to a priority and an accumulation valid time corresponding to the area number; a time reading unit that reads a reception time from a table unit based on the read area number; A determination unit that determines whether the sum of the read reception time and the read accumulation valid time exceeds the current time, and determines that the sum has exceeded In such a case, a configuration may be provided in which a correction unit that deletes the area number and the accumulation valid time related to the determination from the list unit is provided.

As a result, the effective storage time is described in the queue list together with the effective storage time and registered for each area number, so that the effective storage time corresponding to each area number can be specified in a short time. Further, the image data transmission device, a time specifying unit that specifies a reception time indicating a time when the drawing command was received,
A time determining unit that determines an accumulation effective time indicating a time during which the drawing command continues to exist effectively, for each drawing command, and a timer unit that counts the current time; and the table unit further sets a reception time. The table control unit further includes a storage column for a reception time to be stored in association with the drawing instruction, wherein the table control unit further stores the received drawing instruction and the reception time in the table unit in association with each other, and the list unit includes ,
Further, it has a storage column of the storage effective time to store the area number and the storage effective time in association with each other, the list control unit,
Further, an area number determined for the accepted drawing command and an accumulation effective time are stored in association with each other in the list section, and the number specifying section temporarily reads the area number from the list section in accordance with the priority. A number temporary reading unit, a time reading unit for reading a storage effective time corresponding to a temporarily read area number, a time reading unit for reading a reception time from a table unit based on the temporarily read area number, and a timer And a determination unit that obtains the current time from the unit, determines whether or not the sum of the read accumulation valid time and the read reception time is greater than the current time. If it is determined, the temporarily read area number may be specified.

As a result, the storage effective time is described in the queue list together with the area number and registered for each area number, and when the image data of the image portion to be updated is specified, the drawing which has become meaningless due to the lapse of time has become meaningless. Since it is determined whether or not the area number is related to the command, it is possible to avoid transmitting meaningless image data to the image data receiving device, as in the above case.

Further, the image data transmitting device further identifies a priority indicating the importance of the rendering command for each rendering command, and identifies the order in which the rendering commands are received, and A number determining unit that determines an ascending area number in the order of reception, a time specifying unit that specifies a reception time indicating a time at which the drawing command was received,
A table unit having an interval determining unit that determines a time interval for grouping received drawing commands according to respective reception times, and a storage column that stores drawing commands, area numbers, and area information in association with each other. And a list section having a storage section for storing the time indicating the start of the time interval, the priority and the area number in association with each of the time intervals determined by the interval determination section, and the received drawing command. ,
A table control unit that stores the determined area number, the generated area information, and the specified reception time in a table unit in association with each other, and reception of a drawing instruction first received within one time interval The time is stored in the time storage column indicating the start of one time interval, and the determined priority and the determined area number of the drawing command received within the one time interval are stored in one time interval. A list control unit that stores the number in the list unit in association with the time indicating the start, wherein the extraction unit specifies the area number from the list unit in accordance with the priority for each time interval determined by the interval determination unit A number specifying unit, an information reading unit that reads out region information from the table unit based on the specified region number, and a region information read out in the updated frame memory in accordance with the priority at each time interval. It may be configured to include a data extracting unit for extracting image data of a rectangular region indicated by.

In this way, the area numbers registered in the queue list are grouped at regular time intervals, and when specifying the image data of the image portion to be updated, the area numbers are divided every time the constant time elapses. Therefore, it is possible to avoid transmitting image data that has become meaningless due to the passage of time to the image data receiving apparatus.

Further, the list control section includes a number specifying section for specifying an area number from the list section in accordance with a priority, and an information reading section for reading area information from a table section based on the specified area number. A rectangle specifying unit that specifies each rectangular region from region information generated based on the received drawing command and region information read based on the specified region number; When the priority determined for the specified drawing command is set as the first priority and the priority corresponding to the specified area number is set as the second priority, the priority for determining the magnitude relation of these priorities is determined. A degree determination unit that determines, based on the read area information, that when the first priority value is determined to be equal to or smaller than the second priority value, Rectangle Is included in the rectangular area specified by the generated area information, and a first inclusion determination unit that determines whether the first priority value is larger than the second priority value A second inclusion determination unit configured to determine whether the rectangular area specified by the generated area information is included in the rectangular area specified by the read area information. If the first inclusion determination unit determines that the information is included, the area number corresponding to the read area information is deleted from the list unit, and if the second inclusion determination unit determines that the information is included. And a storage control unit that excludes an area number corresponding to the generated area information from targets to be stored in the list unit.

Thus, it is determined whether or not one rectangular area is included in the other rectangular area. If it is determined that the rectangular area is included, the area information corresponding to the other rectangular area and the one rectangular area are included. Since the image data including the image data is transmitted, the transmission of the duplicated area information and the image data is eliminated,
Efficient image transmission becomes possible. Furthermore, the list control unit, from the list unit, a number specifying unit that specifies an area number according to priority, based on the specified area number, an information reading unit that reads area information from the table unit, From the area information generated based on the received drawing command and the area information read based on the specified area number, a rectangle specifying unit that specifies each rectangular area; When the priority determined for the drawing command is set as the first priority and the priority corresponding to the specified area number is set as the second priority, a priority determination for determining a magnitude relationship between these priorities And when the first priority value is determined to be equal to or less than the second priority value, the first priority value is specified by the read area information. Rectangular area A first neighborhood determining unit that determines whether or not the rectangular area specified by the generated area information is at a predetermined distance, and wherein the first priority value is greater than the second priority value. When it is determined that the area is large, a determination is made as to whether or not the rectangular area specified by the generated area information is at a predetermined distance from the rectangular area specified by the read area information. (2) When the first neighborhood determination unit determines that the distance is a predetermined distance, the content of the generated region information includes a rectangular region specified by the read region information. The area number corresponding to the read area information is deleted from the list section, and when the second neighborhood determining section determines that the area information is at a predetermined distance, the read area information is deleted. The contents of the above generated A storage control unit that corrects the area number corresponding to the generated area information to exclude the area number corresponding to the generated area information from the list area. You may.

Thus, it is determined whether or not one rectangular area and the other rectangular area are near each other. Since the image data is transmitted, the area information and the number of times of image data transmitted from the image data transmitting apparatus to the image data receiving apparatus can be reduced. Further, the image data receiving device according to the present invention is an image data receiving device having a frame memory for storing image data transmitted from the image data transmitting device, receiving means for receiving the area information and the image data, There is provided a specifying unit for specifying a region in the frame memory based on the region information, and an updating unit for updating image data of the specified region in the storage unit with the received image data.

Thus, the image data receiving device can easily specify the image data to be updated in the frame memory based on the area information and the image data received from the image data transmitting device. Further, the image data receiving device may further include a display unit that reads out the image data from the frame memory and displays the image data on a display device. Accordingly, the image data receiving device can appropriately reproduce the image updated in the image data transmitting device by displaying the image data in the frame memory on the display device.

A recording medium on which an image data transmission program according to the present invention is recorded has an image memory having a frame memory for storing image data corresponding to the image in order to display the image on a display device of the image data receiving apparatus. A computer-readable recording medium storing an image data transmission program for a data transmission device, wherein, when a part of the image is updated, area information indicating an area of the updated image part in the image and an image part And a transmitting step of transmitting the generated area information and the image data to the image data receiving apparatus.

Thus, the image data transmitting apparatus transmits, to the image data receiving apparatus, the area information which can easily specify the image data of the changed image in the frame memory and the image data corresponding to the area. Even if the image data receiving device that receives the area information and the image data has a small storage capacity and does not have a configuration that supports a drawing command or the like, it is possible to preferably transmit the changed image and reduce the cost. Can be planned.

Further, the recording medium on which the image data receiving program according to the present invention is recorded stores an image data receiving program for an image data receiving apparatus having a frame memory for storing image data transmitted from the image data transmitting apparatus. A computer-readable recording medium, a receiving step of receiving area information and image data, a specifying step of specifying an area in a frame memory based on the area information, and an image data of the area in the specified storage means. And updating the received image data with the received image data.

Accordingly, the image data receiving apparatus reproduces the image changed based on the area information received from the image data transmitting apparatus and the image data corresponding to the area. Even if it is not provided with a configuration that supports the above, the changed image can be preferably reproduced, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a functional block diagram of a data transmission system 10 including an image data transmitting device 100 and an image data receiving device 150.

FIG. 2 is a more detailed functional block diagram of a drawing command control unit 103 in the image data transmitting apparatus 100.

FIG. 3 is a diagram illustrating an example of a configuration of a drawing information table created by a drawing information table control unit 201;

FIG. 4 is a diagram for explaining the contents of area information.

FIG. 5 is a diagram illustrating an example of a queue list created by a queue list control unit 202;

FIG. 6 is an example of a drawing command registration list including priorities defined by a user in advance.

FIG. 7 is a diagram showing an example of an accumulation effective time registration list defined by a user in advance.

FIG. 8A is a diagram illustrating an example of a drawing command including region information itself. (b) is a diagram showing an example of a drawing command which does not include all the area information itself.

FIG. 9 is a diagram showing more detailed functional blocks of a drawing data specifying unit 107;

10 shows an example of drawing data generated by the drawing data synthesizing unit 903 and output to the data compression unit 108. FIG.

FIG. 11 is a diagram showing a state before display contents of a screen are changed by an operation of a user on the transmission device 100 side.

FIG. 12 is a diagram illustrating a state after display content of a screen is changed by an operation of a user on the transmission device 100 side.

FIG. 13 is a diagram illustrating a rectangular area specified by a drawing command decoding unit based on a drawing command generated by a drawing command generation unit in response to an operation input by a user of the transmission apparatus.

FIG. 14 is a drawing information table 300 according to the first embodiment.
6 is a flowchart showing a flow of processing related to generation of a queue list 500.

FIG. 15 is a flowchart showing a more detailed processing flow of a subroutine “queue list creation / modification processing (S1409)” in FIG. 14;

FIG. 16 is a flowchart illustrating a flow of processing until the drawing data is specified and the drawing data is transmitted to the receiving device 150 according to the present embodiment.

FIG. 17 illustrates an example of a configuration of a queue list to which time data is added, created by a queue list control unit according to the second embodiment.

FIG. 18A is a diagram showing an example of three types of area numbers 1801 to 1803 in the drawing information table and area information corresponding to each of them. FIG. 2B is a diagram showing a rectangular area formed on the screen based on the area information of FIG.

FIG. 19 is a flowchart illustrating a flow of an inclusion determination process in a queue list control unit according to the third embodiment.

FIG. 20A is a diagram showing an example of three types of area numbers 2001 and 2002 in the drawing information table and area information corresponding to each of them. FIG. 2B is a diagram showing a rectangular area formed on the screen based on the area information of FIG. (c) is a diagram showing an example of area information representing a corrected rectangular area.

FIG. 21 is a flowchart illustrating a flow of a proximity determination process in a queue list control unit according to the fourth embodiment.

FIG. 22 is a block diagram showing functions of each device when transmitting an image from a conventional server device 2200 to a client device 2250.

[Explanation of symbols]

 Reference Signs List 10 data transmission system 100 image data transmission device 101 application software storage unit 102 drawing command generation unit 103 drawing command control unit 104 drawing control data storage unit 105 drawing execution unit 106 frame memory 107 drawing data specification unit 108 data compression unit 109 transmission / reception unit 110 Resource data storage unit 111 Interrupt timer 112 Input operation unit 113 Display unit 114 Main control unit 150 Image data receiving device 151 Transmission / reception unit 152 Data decompression unit 153 Frame memory control unit 154 Frame memory 155 Input operation unit 156 Display unit 157 Main control unit 201 drawing information table control unit 202 queue list control unit 203 drawing command decoding unit 901 area information specifying unit 902 image data specifying unit 903 drawing data synthesizing unit 2200 server device 2201 application software storage unit 2202 drawing command generation unit 2203 drawing command processing unit 2204 frame memory 2205 transmission / reception unit 2206 main control unit 2250 client device 2251 transmission / reception unit 2252 drawing command processing unit 2253 frame memory 2254 resource data storage unit 2255 input operation unit 2256 display Unit 2257 main control unit

 ──────────────────────────────────────────────────続 き Continued on the front page F-term (reference)

Claims (15)

[Claims] 1. An image data transmitting apparatus having a frame memory for storing image data corresponding to an image for displaying the image on a display device of the image data receiving apparatus, the command updating a part of the image. Means for generating area information indicating an area of the image portion to be updated in the image and image data corresponding to the image portion, and transmitting the generated area information and image data to the image data receiving apparatus. Transmitting means for transmitting image data to the image data transmitting apparatus. 2. A generating unit, comprising: a command receiving unit that receives a drawing command for updating image data of a part of the frame memory; and a generating unit that generates region information of the image portion based on the received drawing command. An update unit that executes a drawing command to update image data in the frame memory; and an extraction unit that extracts image data corresponding to the generated area information in the updated frame memory. The image data transmitting apparatus according to claim 1, wherein 3. The method according to claim 1, wherein the generating unit generates the area information by extracting area information indicating a rectangular area from the drawing command, or generates the area information indicating a rectangular area from the drawing command. The image data transmitting apparatus according to claim 2, wherein the unit extracts the extracted or calculated image data in the rectangular area in the updated frame memory. 4. The image data transmitting apparatus further includes: a priority determining unit that determines a priority indicating the importance of the drawing command for each drawing command; and identifies an order in which the drawing command is received. A number determining unit that determines the ascending order of the area number, a table unit having a storage column for storing the drawing command, the area number, and the area information in a corresponding manner, and storing the priority and the area number in a corresponding manner. A list section having a storage column to be stored, a table control section for storing the received drawing command, the determined area number, and the generated area information in a table section in association with each other; A list control unit that stores the determined priority of the instruction and the determined area number in the list unit in association with each other; A number specifying unit that specifies an area number by using the specified area number, an information reading unit that reads area information from the table unit based on the specified area number, and an area that is read in accordance with the priority in the updated frame memory. The image data transmitting apparatus according to claim 3, further comprising a data extracting unit that extracts image data in a rectangular area indicated by the information. 5. The image data transmitting apparatus further includes: a time specifying unit that specifies a reception time indicating a time at which a drawing command has been received; and a timer unit that measures a current time. A table for storing a reception time in correspondence with a drawing command, wherein the table control unit further stores a drawing command and a reception time in a table unit in association with each other; A number reading unit that reads an area number from the list unit in accordance with a priority; a table reading unit that reads a drawing command and a reception time from a table unit based on the read region number; A time determining unit that determines the effective storage time indicating the time during which the data remains valid for the read drawing command, and the current time obtained from the timer unit and the read reception time A determining unit that determines whether the sum of the storage valid time determined by the read drawing command has exceeded the current time; and, if it is determined that the total time has exceeded, the list unit. The image data transmitting apparatus according to claim 4, further comprising: a correction unit that deletes the read area number according to the determination. 6. The image data transmitting apparatus further includes: a time specifying unit that specifies a reception time indicating a time at which a drawing command has been received; and a timer unit that measures a current time. A table for storing the drawing command and the reception time in association with each other, wherein the table control unit further stores the received drawing command and the specified reception time in the table unit in association with each other. The number identification unit reads a drawing command and a reception time from the table unit based on the temporarily read area number from the list unit. A table reading unit, a time determining unit for determining a storage effective time indicating a time during which the drawing command is kept valid for the read drawing command, and obtaining a current time from the timer unit. A determination unit for determining whether the sum of the read reception time and the determined storage valid time exceeds the current time; The image data transmitting apparatus according to claim 4, wherein the specified area number is specified. 7. The image data transmitting apparatus further includes: a time specifying unit that specifies a reception time indicating a time at which a drawing command is received; and a storage valid time that indicates a time during which the drawing command continues to exist effectively. A time determination unit that determines a drawing command; and a timer unit that measures a current time.The table unit further includes a reception time storage column that stores the reception time in association with the drawing command. The table control unit further stores the received drawing command and the reception time in the table unit in association with each other, and the list unit further stores the storage valid time and the area number in association with each other. The list control unit further includes a time storage column, wherein the list control unit further stores, in the list unit, the area number determined for the accepted drawing command and the accumulation valid time in association with each other. And a list reading unit for reading out the area number in accordance with the priority from the list unit and the storage valid time corresponding to the area number, and a time for reading the reception time from the table unit based on the read area number. A reading unit, a determination unit that obtains the current time from the timer unit, and determines whether the time based on the read reception time and the read accumulation valid time exceeds the current time. 5. The image data transmitting apparatus according to claim 4, further comprising: a correction unit that deletes, when it is determined that the number has exceeded, the area number and the accumulation valid time related to the determination from the list unit. 8. The image data transmitting apparatus further includes: a time specifying unit that specifies a reception time indicating a time at which the drawing command is received; and an accumulation valid time indicating a time during which the drawing command continues to exist effectively. A time determination unit that determines an instruction; and a timer unit that measures a current time. The table unit further includes a storage column for a reception time that stores the reception time in association with the drawing instruction. The control unit further stores, in the table unit, the received drawing command and the reception time in association with each other, and the list unit further stores the area number and the storage effective time in association with each other. The list control unit further stores, in the list unit, the area number determined for the accepted drawing command and the accumulation valid time in association with each other, A number temporary reading unit that temporarily reads an area number from the list unit in accordance with a priority; a time reading unit that reads an accumulation effective time corresponding to the temporarily read area number; A time reading unit that reads the reception time from the table unit based on the area number that has been read, and a current time that is obtained from the timer unit. 5. The image data transmitting apparatus according to claim 4, wherein the determination unit determines whether the time has passed, and when it is determined that the time has not passed, the area number temporarily read is specified. 9. The image data transmitting apparatus further includes: a priority determining unit that determines a priority indicating the importance of the drawing command for each drawing command; and identifies an order in which the drawing command is received. A number determination unit that determines the ascending order of the area numbers, a time identification unit that identifies a reception time indicating the time at which the drawing instruction was received, and a grouping of the received drawing instruction according to each reception time Determining unit for determining a time interval for performing the drawing, a table unit having a storage column for storing a drawing command, an area number, and area information in association with each other; and a time interval for each time interval determined by the interval determining unit. A time indicating the start of the list, a list section having a storage column for storing the priority and the area number in association with each other, the accepted drawing command, and the determined area number. A table control unit that stores the generated area information and the specified reception time in a table unit in association with each other; and a storage column for storing the reception time of the received drawing command, indicating the start of one time interval. A list control unit that stores the determined priority and the determined area number in the list unit in association with the time indicating the start of the time interval, for the drawing command received within the time interval. The extracting unit, from the list unit, a number specifying unit that specifies an area number according to the priority for each time interval determined by the interval determining unit, based on the specified area number, from the table unit An information reading unit for reading area information; and in the updated frame memory, a rectangular area indicated by the area information read in accordance with the priority at each of the determined time intervals. Image data transmitting apparatus according to claim 3, characterized in that it comprises a data extraction unit for extracting image data. 10. A list control unit, comprising: a number specifying unit that specifies an area number in accordance with a priority from the list unit; and an information reading unit that reads area information from a table unit based on the specified area number. A rectangle specifying unit that specifies each rectangular region from the region information generated based on the received drawing command and the region information read based on the specified region number; When the priority determined for the specified drawing command is set as the first priority and the priority corresponding to the specified area number is set as the second priority, the priority for determining the magnitude relation of these priorities is determined. And a degree determination unit, when it is determined that the first priority value is equal to or smaller than the second priority value, the first priority value is specified by the read area information. Rectangle area A first inclusion determining unit that determines whether or not the area is included in the rectangular area specified by the generated area information; and determines that the value of the first priority is greater than the value of the second priority. In the case where the rectangular area specified by the generated area information is included in the rectangular area specified by the read area information, a second inclusion determining unit that determines whether the rectangular area specified by the generated area information is included in the rectangular area. When it is determined by the first inclusion determination unit that the content is included,
An area number corresponding to the read area information is deleted from the list section, and if it is determined that the area information is included in the second inclusion determination section, an area number corresponding to the generated area information is deleted from the list section. 5. The image data transmitting apparatus according to claim 4, further comprising: a storage control unit configured to exclude the image data from the storage target. 11. A list control unit, comprising: a number specifying unit that specifies an area number in accordance with a priority from the list unit; and an information reading unit that reads area information from a table unit based on the specified area number. A rectangle specifying unit that specifies each rectangular region from the region information generated based on the received drawing command and the region information read based on the specified region number; When the priority determined for the specified drawing command is set as the first priority and the priority corresponding to the specified area number is set as the second priority, the priority for determining the magnitude relation of these priorities is determined. A degree determination unit, when the first priority value is determined to be equal to or smaller than the second priority value, the first priority value is specified by the read area information. Rectangle A first proximity determining unit that determines whether the area is at a predetermined distance from the rectangular area specified by the generated area information; and a first priority value corresponding to the second priority. When it is determined that the value is larger than the value, it is determined whether the rectangular area specified by the generated area information is at a predetermined distance from the rectangular area specified by the read area information. A second neighborhood determining unit that determines the content of the generated area information when the first neighborhood determining unit determines that the area is at a predetermined distance. The area number corresponding to the read area information is deleted from the list section, and when the second proximity determination section determines that the area number is at a predetermined distance, the area number corresponding to the read area information is deleted. The contents of the area information A storage control unit that corrects to include a rectangular area specified by the generated area information and excludes an area number corresponding to the generated area information from targets to be stored in the list unit. 5. The image data transmitting device according to claim 4, wherein: 12. An image data receiving apparatus having a frame memory for storing image data transmitted from an image data transmitting apparatus, comprising: receiving means for receiving area information and image data; An image data receiving apparatus comprising: a specifying unit that specifies an area in a memory; and an updating unit that updates image data of an area in the specified storage unit with received image data. 13. The image data receiving apparatus according to claim 1, further comprising display means for reading out the image data from the frame memory and displaying the image data on a display device.
2. The image data receiving device according to 2. 14. An image data transmission program for an image data transmission device having a frame memory for storing image data corresponding to the image in order to display an image on a display device of the image data reception device. Generating a region information indicating a region in the image of the updated image portion and image data corresponding to the image portion, when the portion of the image is updated. A recording medium storing an image data transmission program for causing a computer to execute a transmitting step of transmitting the area information and the image data to the image data receiving apparatus. 15. A computer-readable recording medium storing an image data receiving program for an image data receiving device having a frame memory for storing image data transmitted from the image data transmitting device, comprising: area information and image data. Executing a receiving step of receiving the information, an identifying step of identifying an area in the frame memory based on the area information, and an updating step of updating image data of the identified area in the storage unit with the received image data. Recording medium for storing an image data receiving program for causing the image data to be received.