JP2009076995A - Web page data transmission apparatus and its operation control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the picture quality of an image to be compressed in a Web page. <P>SOLUTION: Among all contents constituting a Web page 10 to be displayed on a portable terminal, the data amount of total contents is computed, except images 13-15 to be compressed. A margin capacity is computed by subtracting the computed data amount from the memory capacity of a receiving memory built in the portable terminal. The images 13-15 are compressed so that the resultant data amount is the data amount of the computed margin capacity. Contents showing the compressed images 13-15 and the compressed Web page 10 are transmitted to the portable terminal, and the Web page 10 is displayed on a display screen of the portable terminal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a web page data transmission apparatus and an operation control method thereof.

Web page data is transmitted to a portable information terminal such as a mobile phone or PDA (Personal Digital Assistant), so that the user of the portable information terminal can display the web page represented by the web page data. Can be browsed. Such portable information terminals often have a smaller reception memory capacity for receiving and temporarily storing web page data than so-called personal computer devices. For this reason, it is considered that the web content is divided into units called cards and the cards are combined and transmitted (Patent Document 1).
JP 2003-58414 JP

In addition, there is also one that disassembles content into screen element units and transmits the disassembled content within the capacity of a reception memory included in a terminal device to be transmitted (Patent Document 2). Further, there is a technique that determines a display restriction of a terminal device that has requested transmission, and corrects content according to the display restriction (Patent Document 3).
Japanese Patent Laid-Open No. 2003-141022 JP 2001-571211 A

  However, in either case, content or the like that fits in the capacity of the reception memory included in the terminal device to be transmitted is transmitted, but the capacity of the reception memory included in the terminal device to be transmitted is utilized to the maximum. It is not considered to be used as effectively as possible.

  An object of the present invention is to make maximum use of the capacity of a reception memory included in a terminal device to be transmitted.

  According to the present invention, there is provided a web page data transmitting apparatus that receives the web page represented by web page data temporarily stored in a built-in reception memory on a display screen. Subtraction to calculate the margin capacity of the reception memory by subtracting the total capacity of the contents of the web page displayed on the display screen of the portable terminal device excluding the compression target image from the memory capacity of the memory. Means, compression means for compressing image data representing the image to be compressed so that the amount of compressed image data after compression of the image to be compressed becomes the marginal capacity, content excluding the image to be compressed and the compression The image processing apparatus includes a transmission unit that transmits the image data compressed by the unit to the portable terminal device.

  The present invention also provides an operation control method suitable for the web page data transmitting apparatus. That is, in this method, the subtracting means displays the web page represented by the web page data temporarily stored in the built-in reception memory on the display screen of the portable terminal device. Subtracting the total capacity of the contents excluding the image to be compressed from the contents constituting the web page displayed on the display screen of the portable terminal device from the memory capacity to calculate a margin capacity of the reception memory, and compression means However, the image data representing the image to be compressed is compressed so that the data amount of the compressed image data after compression of the image to be compressed becomes the marginal capacity, and the transmission means includes the content excluding the image to be compressed and the content The image data compressed by the compression means is transmitted to the portable terminal device.

  According to the present invention, the total capacity of the content excluding the compression target image among the contents constituting the web page displayed on the display screen of the portable terminal device from the memory capacity of the reception memory included in the portable terminal device. Is subtracted, the marginal capacity of the reception memory included in the portable terminal device is calculated. The image data representing the compression target image is compressed so that the data amount of the compressed image data after compression of the compression target image becomes the calculated marginal capacity. The compressed image data and the content excluding the compression target image are transmitted to the portable terminal device. The image data representing the image to be compressed is compressed so as to have the maximum amount of data that can be received by the portable terminal device. For this reason, the compressed image has a relatively high image quality. Moreover, since the total amount of data transmitted to the portable terminal device can be received by the portable terminal device, it is possible to prevent malfunctions such as errors.

  In the case where there are a plurality of compression target images, the data compression means, for example, the amount of compressed image data after compression of the compression target images of each of the plurality of compression target images exceeds the margin capacity. The ratio of the compressed image data after compression of the plurality of compression target images corresponds to the predetermined ratio of the data amount of the compression target image data. Is.

  The data compression means may further comprise a determination means for determining whether the data amount of the compressed image data is greater than or equal to a data amount that is predetermined according to the size of the image. In this case, when the data amount of the compressed image data is determined to be greater than or equal to a predetermined data amount according to the size of the image by the determination means, the predetermined data amount is less than or equal to the predetermined data amount. The image data will be compressed as follows.

  FIG. 1 shows an embodiment of the present invention and is an outline of a web page transmission system.

  The web page transmission system includes a portable terminal device (mobile phone, PDA: Personal Digital Assistants) 1 and a web page transmission device 6 that can communicate with each other.

  The web page transmission device 6 includes a content transmission server 2 and a conversion server 4 that can communicate with each other. The content transmission server 2 and the conversion server 4 can communicate with the portable terminal device 1. A content database 3 is connected to the content transmission server 2. The content database 3 stores content such as HTML (HyperText Markup Language) files, image (still image) files, and moving image files that constitute web pages. A terminal database 5 is connected to the conversion server 4. The terminal database 5 stores data representing the specifications of the portable terminal device 1.

  The portable terminal device 1 incorporates a display device, a communication device for communicating with the content transmission server 2 and the conversion server 4, a CPU, a reception memory (all not shown), and the like. A web page represented by the web page data temporarily stored in the built-in reception memory is displayed on the display screen of the display device.

  The conversion server 4 includes a communication device for communicating with the portable terminal device 1 and the content transmission server 2, a CPU for performing data amount calculation processing, data compression processing, and the like, which will be described later, and for temporarily storing data. A memory, a keyboard for inputting commands, a display device (both not shown), and the like are incorporated. The content transmission server 2 has the same configuration as the conversion server 4.

  A request for a web page is made from the portable terminal device 1 to the content transmission server 2 of the web page data transmission device 6. Then, content (web page data) excluding the image to be compressed among the images included in the web page is transmitted from the content transmission server 2 to the portable terminal device 1. The content is temporarily stored in a reception memory built in the portable terminal device 1.

  An image to be compressed is requested from the portable terminal device 1 to the conversion server 4. Then, the specifications of the portable terminal device 1 are read from the terminal database 5. Further, all the contents constituting the web page requested by the portable terminal device 1 are requested from the conversion server 4 to the content transmission server 2. All the contents constituting the web page are transmitted from the content transmission server 2 to the conversion server 4. In the conversion server 4, the compressed image after compression of the compression target image so that all the contents constituting the web page including the compressed content of the compression target image fit within the memory capacity of the reception memory of the portable terminal device 1. The amount of data is calculated. The compression target image is compressed so as to have the calculated compressed image data amount. The compressed image data (web page data) is transmitted from the conversion server 4 to the portable terminal device 1. Details will be clear from the following explanation.

  FIG. 2 is an example of a web page requested by the portable terminal device 1.

  The web page 10 has a URL (Uniform Resource Locator) of http://zzz.aaa.com/abc.html. The web page 10 includes a first gif image 11 and a second gif image 12 represented by a GIF (GraphicsInterchangeFormat) file, and first jpeg images 14, 15 and 16 represented by a JPEG (JointPhotographicCodingExpertsGroup) file. As well as a video 16 represented by a video file.

  The layout, text, etc. of the web page 10 are defined by the HTML file for this web page.

  FIG. 3 is an example of a terminal specification table stored in the terminal database 5.

  The terminal specification table stores specifications for each model of portable terminal device.

  The specifications include screen size, playback format, reception memory capacity, thumbnail image size, thumbnail image data amount, main image size, main image data amount, and the like. The screen size is the size of the display screen provided in the portable terminal device 1. The playback format is a still image playback format. The reception memory capacity is the memory capacity of the reception memory built in the portable terminal device 1. The thumbnail image size is the image size when the thumbnail image is displayed, and the thumbnail image data amount is the data amount of the thumbnail image when the thumbnail image is displayed. The main image size is an image size when a main image (an image larger in size than a thumbnail image other than a thumbnail image) is displayed, and the main image data amount is the data amount of the main image.

  FIG. 4 is a flowchart showing a processing procedure of the web page transmission system. In this processing procedure, the portable terminal device 1 requests content for displaying the web page 10 shown in FIG. 2 from the web page data transmission device 6 (the content transmission server 2 and the conversion server 4). is there.

  Referring mainly to FIG. 1 and FIG. 4, the mobile terminal device 1 requests the web page 10 having the URL of http://zzz.aaa.com/abc.html from the content transmission server 2 (step 21). ). Then, of the contents constituting the web page 10, the contents excluding the image to be compressed are read from the contents database 3, and the read contents are transmitted from the contents transmission server 2 to the portable terminal device 1 ( Step 31). In the web page 10 shown in FIG. 2, it is assumed that the compression target images are the first JPEG image 13, the second JPEG image 14, and the third JPEG image 15. Whether an image is a compression target image is predetermined for each web page. Contents excluding JPEG images 13, 14 and 15 which are compression target images (HTML file of web page 10, image file representing first GIF image 11 and second GIF image, and movie file representing movie 16) The content is transmitted from the content transmission server 2 to the portable terminal device 1.

  Since the content transmitted from the content transmission server 2 does not include an image file to be compressed, the compression target image is requested from the portable terminal device 1 to the conversion server 4 (step 22). This request includes a URL indicating the storage location of the requested compression target image: http://xxx.yyy.com/img.001.jpg?url= http://zzz.aaa.com/abc.html It is. It goes without saying that the URL indicating the storage location of the requested compression target image is described in the HTML document represented by the HTML file transmitted from the content transmission server 2 to the portable terminal device 1 as described above. http://xxx.yyy.com/img.001.jpg indicates the storage location of the first JPEG image 13 of the web page 10 (the file name of the first JPEG image 13 is 001.jpg) http://xxx.yyy.com/img.001.jpg?url= http://zzz.aaa.com/abc.html is the first image 13 in this storage location http: // zzz. It is displayed on the web page 10 of aaa.com/abc.html. Similarly to the first JPEG image 13, the second JPEG image 14 and the third JPEG image 15 are also requested from the portable terminal device 1 to the conversion server 4.

  When there is a request for an image to be compressed from the portable terminal device 1 to the conversion server 4, the specifications of the requested portable terminal device 1 are read from the terminal database 5 (step 41). Further, since the web page 10 requested by the portable terminal device 1 is known from the request for the compression target image from the portable terminal device 1, the web requested by the portable terminal device 1 from the conversion server 4 to the content transmission server 2 is obtained. -All the content which comprises the page 10 is requested | required of the content transmission server 2 from the conversion server 4 (step 42). All the contents requested from the conversion server 4 are transmitted from the content transmission server 2 to the conversion server 4 (step 32).

  The conversion server 4 knows the memory capacity of the reception memory of the portable terminal device 1 and the data amounts of all the contents constituting the web page 10. For this reason, the total capacity of the contents excluding the image to be compressed among all the contents constituting the web page 10 is subtracted from the memory capacity of the reception memory of the portable terminal device 1 so that the margin capacity of the reception memory is obtained. Calculated. The compressed image data amount of the compression target image is calculated so that the data amount after compression of the compression target image becomes the calculated marginal capacity (step 43). Since the amount of compressed image data is increased according to the capacity of the receiving memory, a relatively high-quality compressed image can be obtained. This calculation process will be described in detail later. The compression target image is compressed in the conversion server 4 so as to be the calculated (allocated) data amount (step 44). The compressed image data is transmitted from the conversion server 4 to the portable terminal device 1 (step 45).

  By transmitting the compressed image data from the conversion server 4, the portable terminal device 1 has all the contents constituting the web page 10. As a result, the web page 10 shown in FIG. 2 is displayed on the display screen of the portable terminal device 1 (step 23).

  FIG. 5 is a flowchart showing the compressed data amount calculation process (the process of step 43 in FIG. 4).

  First, the total data amount of the contents excluding the compression target image among all the contents constituting the web page is calculated (step 51).

  FIG. 6 shows the relationship between content and data amount.

  The amount of data of the HTML file constituting the web page 10 is 10 KB, the amount of data of the image file representing the first GIF image 11 and the amount of data of the image file representing the second GIF image 12 are each 3 KB, and the movie 16 is represented. It is assumed that the data amount of the movie file is 20KB. Then, the total data amount of the content excluding the compression target image is 10 + 3 + 3 + 20 = 36 KB.

  Returning to FIG. 5, the marginal capacity of the reception memory is calculated by subtracting the calculated total data amount of the content excluding the compression target image from the memory capacity of the reception memory of the portable terminal device 1 ( Step 52). It is assumed that the memory capacity of the reception memory of the portable terminal device 1 is 100 KB. Then, the surplus capacity that represents the amount of data that can be used for the compression target image is 100−36 = 64 KB. Thereafter, the amount of data allocated to the compressed image data is calculated (step 53).

  The first allocation of image data is to equalize according to the number of compression target images.

  FIG. 7 is an example of a data amount allocation table.

  In the web page 10 shown in FIG. 2, the compression target images are three frames of a first JPEG image 13, a second JPEG image 14, and a third JPEG image 15. By dividing the surplus capacity by 3, the data amount after compression of each of the compressed images 13, 14 and 15 is calculated. That is, since the surplus capacity is 64 KB, when the surplus capacity 64 KB is divided by 3, the data amount after compression of each of the compressed images 13, 14 and 15 is 64/3 = 21.3 KB.

  The second allocation of image data is determined in proportion to the predetermined thumbnail image data amount and main image data amount in the portable terminal device 1.

  As shown in FIG. 3, the data amount of an image (thumbnail image) having a size of 50 × 50 is 2 KB, and the data amount of an image (main image) having a size of 120 pixels × 40 pixels is 10 KB. Therefore, the data amount of 50 × 50 size and the data amount of 120 × 40 size are in a ratio of 1: 5. Since the first JPEG image 13 and the second JPEG image 14 have a size of 50 × 50 and the third JPEG image 15 has a size of 120 × 40, the first JPEG image 13 and the second JPEG image The ratio of the compressed image data between 14 and the third JPEG image 15 is 2: 2: 10. The data amount of the compressed image data is calculated according to this ratio. The first JPEG image 13 and the second JPEG image 14 are both {64 / (2 + 2 + 10)} × 2 = 9.14 KB. The third JPEG image 15 is {64 / (2 + 2 + 10)} × 10 = 45.7 KB. As shown in FIG. 8, the amount of image data after compression of the image to be compressed is determined.

  The compression target image is compressed so that the image data amount allocated in this way is obtained. The compressed image has a relatively high image quality.

  9 to 11 show modifications.

  FIG. 9 corresponds to FIG. 5 and is a flowchart showing a compressed data amount calculation processing procedure. In this figure, the same processes as those shown in FIG.

  In this modification, the amount of image data after compression is limited for each image size. If the calculated data amount of the image data exceeds the limit data amount (YES in step 54), the image data is corrected to be within the limit data amount (step 55). The data amount of image data transmitted to the portable terminal device 1 can be suppressed.

  FIG. 10 is an example of a limited data amount table.

  The limited data amount is determined according to the image size. The image sizes of 50 × 50 or less, 51 × 51 to 100 × 100, and 101 × 101 to 150 × 150 are 10 KB, 40 KB, and 90 KB, respectively. When the aspect ratio of the image size does not apply to the image size of the limited data amount table, it is determined which size is included based on the number of pixels of the image size. For example, if the number of pixels of the image size is 50 × 50 = 2500 pixels or less, the limit data amount is 40 KB, and if the number of pixels of the image size is 51 × 51 = 2601 pixels to 100 × 100 = 10000 pixels, the limit is If the data size is 40 KB and the number of pixels of the image size is from 101 × 101 = 10201 pixels to 150 × 150 = 2500 pixels, the limit data amount will be 90 KB.

  FIG. 11 is an example of a corrected data amount allocation table.

  When the data amount is allocated as shown in FIG. 7, the data amount of the first JPEG image 13 and the second JPEG image 14 is 21.3 KB, respectively, which exceeds the limit data amount of 10 KB. For this reason, the limit data amount is corrected to 10 KB.

1 shows an overview of a web page transmission system. It is an example of a web page. It is an example of a terminal specification table. It is a flowchart which shows the process sequence of a web page transmission system. It is a flowchart which shows the compression data amount calculation processing procedure. It is an example of a content / data amount table. It is an example of a data amount allocation table. It is an example of a data amount allocation table. It is a flowchart which shows the compression data amount calculation processing procedure. It is an example of a limit data amount table. It is an example of a data amount allocation table.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Portable terminal device 2 Content transmission server 3 Conversion server 6 Web page data transmission device
10 Web pages
13-15 Image to be compressed

Claims (4)

From the memory capacity of the reception memory of the portable terminal device that displays the web page represented by the web page data temporarily stored in the built-in reception memory on the display screen, the portable terminal device Subtracting means for subtracting the total capacity of the contents excluding the compression target image from the contents constituting the web page to be displayed on the display screen, and calculating a margin capacity of the reception memory;
The compression means for compressing the image data representing the compression target image, the content excluding the compression target image, and the compression means so that the data amount of the compressed image data after compression of the compression target image becomes the margin capacity Transmitting means for transmitting the compressed image data to the portable terminal device;
A web page data transmission device comprising: There are multiple images to be compressed,
In the data compression means, the data amount of the compressed image data after compression of the compression target image of each of the plurality of compression target images is a capacity obtained by dividing the margin capacity by the plurality, or a plurality of the above The ratio of the data amount of the compressed image data after the compression of the compression target image corresponds to the predetermined ratio of the data amount of the image data of the compression target image.
The web page data transmission apparatus according to claim 1. The data compression means is
A determination means for determining whether or not the data amount of the compressed image data is greater than or equal to a predetermined data amount according to the size of the image;
When the data amount of the compressed image data is determined to be equal to or greater than the predetermined data amount according to the size of the image, the predetermined data amount is equal to or less than the predetermined data amount. Compresses image data,
The web page data transmission apparatus according to claim 2. From the memory capacity of the reception memory of the portable terminal device that displays on the display screen the web page represented by the web page data temporarily stored in the built-in reception memory, the subtracting means Subtracting the total capacity of the content excluding the image to be compressed from the contents of the web page displayed on the display screen of the type terminal device to calculate the margin capacity of the reception memory,
A compression unit compresses the image data representing the compression target image so that the data amount of the compressed image data after the compression of the compression target image becomes the marginal capacity;
A transmission unit that transmits the content excluding the compression target image and the image data compressed by the compression unit to the portable terminal device;
An operation control method for a web page data transmission apparatus.

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