CN102984151A - Method and server for providing picture data for computing terminal - Google Patents
Method and server for providing picture data for computing terminal Download PDFInfo
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Abstract
The invention discloses a method and server for providing picture data for a computing terminal. The method comprises the steps of receiving a picture access request sent by the computing terminal, wherein the picture access request comprises picture information to be accessed and terminal type information of the computing terminal; confirming whether picture format conversion is performed or not according to the terminal type information of the computing terminal; obtaining original picture data corresponding to the picture information in the picture access request when the picture format conversion is confirmed to be performed and converting the original picture data into picture data with a preset format according to a preset format conversion rule, wherein the byte number of the picture data with the preset format is smaller than the byte number of the original picture data; and sending the picture data with the preset format to the computing terminal. Therefore, the problem that the loading speed is low and consumed network flows are large due to large data amount when a mobile terminal accesses pictures, the mobile terminal can quickly load the pictures, and flow consumption in picture accessing is reduced.
Description
Technical Field
The invention relates to the field of image processing, in particular to a method and a server for providing picture data for a computing terminal.
Background
With the rapid development of mobile devices, the types and functions of mobile devices are becoming more and more abundant. Currently, most mobile devices are provided with a picture browsing function, and therefore, more and more people browse pictures through the mobile devices.
However, due to the limitations of the mobile device itself, for example, the hardware configuration and the network bandwidth are far inferior to those of some fixed devices (for example, PCs), when browsing pictures with the mobile device, especially browsing some pictures with large data volume, situations that the pictures are loaded slowly or even loaded unsuccessfully easily occur. Moreover, the data volume of the pictures is large, and the browsing of the pictures needs to consume more network traffic compared with the browsing of the characters, but the network traffic of many mobile devices is limited at present, so that the network traffic is easily exceeded by frequently browsing the pictures, and a lot of extra charges are added for users.
Disclosure of Invention
In view of the above, the present invention is proposed in order to provide a method and a corresponding server for providing picture data to a computing terminal that overcome or at least partially solve the above-mentioned problems.
According to an aspect of the present invention, there is provided a method for providing picture data to a computing terminal, comprising the steps of: receiving a picture access request sent by a computing terminal, wherein the picture access request comprises picture information to be accessed and terminal type information of the computing terminal; determining whether to perform format conversion on the picture according to the terminal type information of the computing terminal; when the format conversion of the picture is determined, obtaining original picture data corresponding to the picture information in the picture access request, and converting the original picture data into the picture data in the preset format according to a preset format conversion rule, wherein the byte number of the picture data in the preset format is smaller than the byte number of the original picture data; and sending the picture data in the preset format to the computing terminal.
Optionally, the picture access request further includes network type information of the computing terminal; and the method further comprises: and determining whether to convert the format of the picture according to the network type information of the computing terminal.
According to another aspect of the present invention, there is provided a server for providing picture data to a computing terminal, comprising: the network interface is suitable for receiving a picture access request sent by the computing terminal, wherein the picture access request comprises picture information to be accessed and terminal type information of the computing terminal, and the picture data in a preset format generated by the server is transmitted to the computing terminal; a type decider adapted to determine whether to format-convert the picture according to terminal type information of the computing terminal; the picture processor is suitable for acquiring original picture data corresponding to the picture information in the picture access request when the type determiner determines to perform format conversion on the picture, and converting the original picture data into the picture data in a preset format according to a preset format conversion rule, wherein the byte number of the picture data in the preset format is smaller than the byte number of the original picture data; and the picture memory is suitable for storing original picture data corresponding to the picture information.
Optionally, the picture access request further comprises network type information of the computing terminal, and the type decider is further adapted to determine whether to format-convert the picture according to the network type information of the computing terminal.
According to the method for providing the picture data to the computing terminal and the corresponding server, the format conversion of the picture can be determined according to the terminal type information of the computing terminal so as to reduce the byte number of the picture data, thereby solving the problems of low loading speed and high network flow consumption caused by large data volume when the mobile terminal accesses the picture, and obtaining the beneficial effects of enabling the mobile terminal to load the picture quickly and reducing the flow consumption when the picture is accessed.
In addition, according to the method and the server, the format conversion of the pictures can be determined according to the network type of the computing terminal, and when the computing terminal accesses the pictures through a low-speed network or a network with higher cost, the transmission quantity of picture data can be reduced, so that the problems that the mobile terminal is low in loading speed and large in consumed network flow when accessing the pictures are solved, the mobile terminal can load the pictures quickly, and the flow consumption when accessing the pictures is reduced.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 illustrates a flow diagram of a method of providing picture data to a computing terminal according to one embodiment of the invention;
FIG. 2 is a diagram illustrating an effect of a hundred degree logo before and after format conversion according to an embodiment of the present invention;
fig. 3 shows a schematic diagram of a server for providing picture data to a computing terminal and a computing terminal connected to the server according to the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
Fig. 1 shows a flowchart of a method of providing picture data to a computing terminal according to one embodiment of the invention.
As shown in fig. 1, the method starts in step S110, and in step S110, a picture access request sent by a computing terminal is received, where the picture access request includes picture information to be accessed and terminal type information of the computing terminal.
Alternatively, step S110 may be implemented as follows: when a user of a computing terminal needs to access a picture through the computing terminal, the browser installed on the computing terminal usually clicks a certain hyperlink or inputs a certain search term, so that the browser triggers the computing terminal to send a picture access request to a device such as a server providing a service, and the picture access request at least needs to include picture information to be accessed by the user, so that the server can find the picture and provide the picture to the user, and the terminal type information of the computing terminal is provided, so that the server can know the terminal type of the computing terminal. Alternatively, the picture access request transmitted by the computing terminal is constructed based on the HTTP protocol, and a field for indicating terminal type information of the computing terminal is included in a user-agent (UA) portion of the HTTP protocol. That is, the UA information is included in the picture access request transmitted each time the computing terminal accesses a picture.
For the convenience of understanding the present invention, the detailed contents of the UA information will be briefly described below. The UA is a special string header, which may contain a series of related information related to the computing terminal, such as the operating system and version used by the computing terminal, the CPU type, the browser type and version, the browser rendering engine, the browser language, the browser plug-in, etc. In general, the standard format of a UA is: a browser identifier; an operating system identification; encrypting the grade mark; a browser language; a rendering engine identification; version information, wherein the browser identification is a string of words in the shape of Mozilla/5.0 or Opera/7.54 that mark the browser product; common operating system identifications include: FreeBSD, Linux, Mac, Solaris, Windows, and the like; the encryption level flag indicates, for example, "N" indicates no secure encryption, "I" indicates weak secure encryption, and "U" indicates strong secure encryption, etc.; the browser language is a language specified in language options in a conventional label of the preference of the browser; the rendering engine may be, for example, a Presto rendering engine, formatted as: presto/version number; the real Version information of the browser is displayed in the browser Version information, and the format is Version/Version number.
Among the above-mentioned series of information contained in the UA, most relevant to the present invention is information that can reflect the terminal type of the computing terminal, for example, an operating system identifier. The terminal type of the computing terminal can be conveniently identified through the operating system identification. Currently, the operating system of the mobile terminal mainstream in the market generally adopts iOS (apple operating system) or Android (google Android operating system), so if the operating system is of the above two types, it can be determined that the terminal type of the computing terminal is the mobile terminal. For example, UA information contained in a picture access request sent by an Android user when accessing a webpage is Mozilla/5.0(Linux; U; Android 3.1; zh-cn; GT-P7310 Build/HMJ37) AppleWebKit/534.13(KHTML, like Gecko) Version/4.0 Mobile Safari/534.1, wherein an "Android" field explicitly indicates that an operating system adopted by a computing terminal device sending the picture access request is an Android system, and therefore indicates that the terminal type of the computing terminal is a Mobile terminal; the UA information contained in the picture access request sent by the Iphone user when accessing the web page is, for example, Mozilla/5.0(Iphone; CPU Iphone OS 5_0 like Mac OS X) apple webkit/534.46(KHTML, like Gecko) Version/5.1 Mobile/9a334 Safari/7534.48.3, where the "Iphone" field explicitly indicates that the computing terminal device sending the picture access request uses an Iphone device, and its corresponding operating system is an iOS system, and therefore, also indicates that the terminal type of the computing terminal is a Mobile terminal. In addition, in order to further improve the accuracy of type judgment, other information in the UA, for example, version information, may be further combined to perform comprehensive judgment.
The above-described manner of using UA information to indicate the terminal type of the computing terminal is only an exemplary manner, and in practical cases, other manners may be used to indicate the terminal type of the computing terminal, for example, a field may be directly set in the picture access request, and is specifically used to indicate the terminal type.
After the above step S110 is performed, in step S120, it is determined whether to format-convert the picture according to the terminal type information of the computing terminal. The main purpose of format conversion of the picture in the present embodiment is to change the number of bytes of the picture data, so as to facilitate network transmission. Moreover, due to the difference between software and hardware of different types of computing terminals, the performance of the computing terminals in browsing pictures is not completely the same, so that whether to convert the format of the pictures can be determined according to the characteristics of the terminal types of the computing terminals.
For example, the screen size of a mobile terminal is relatively small, the resolution is relatively low, and the hardware configuration and processing speed of the mobile terminal are generally not higher than those of a fixed terminal. Therefore, when the terminal type of the computing terminal is the mobile terminal, the format conversion of the picture can be determined, so that the byte number of the picture data is reduced, the flow charge of the user is reduced, and the time consumed for loading the picture on the mobile terminal is shortened. Since the screen size of a fixed terminal (e.g., a desktop PC) is large, the resolution is relatively high, and the hardware configuration and processing speed are generally good, when the terminal type of the computing terminal is a fixed terminal, it may not be necessary to perform format conversion on a picture in order to ensure picture quality. Specifically, in order to conveniently determine whether to perform format conversion for various types of computing terminals in step S120, a comparison table between a terminal type and whether to perform format conversion may be set and stored in advance, and by looking up the comparison table, it is determined whether the corresponding terminal type needs to perform format conversion.
In step S130, when it is determined that format conversion is performed on the picture, original picture data corresponding to the picture information in the picture access request is obtained, and the original picture data is converted into picture data in a predetermined format according to a predetermined format conversion rule, where the number of bytes of the picture data in the predetermined format is smaller than the number of bytes of the original picture data.
In this embodiment, the original picture data corresponding to the picture information may be stored by a picture memory, and the original picture data corresponding to the picture information in the picture access request is acquired by accessing the picture memory. The picture storage may be a single server dedicated to storing picture data, or may be a plurality of servers, each of which stores part of the picture data.
Specifically, the predetermined format conversion rule is set in advance according to the characteristics of the picture format. The purpose of setting the format conversion rule is mainly to convert the picture format with a large number of bytes into the picture format with a small number of bytes, so as to facilitate network transmission. When the format conversion rule is set, a conversion table can be set according to the characteristics of various picture formats, and when the format of original picture data corresponding to the picture information requested in the picture access request is recorded in the conversion table, the format of the converted picture data is directly determined according to the table.
After the original picture data is converted into the picture data of the predetermined format, the picture data of the predetermined format generated in step S130 is transmitted to the computing terminal in step S140.
Through the above method, the original picture data to be accessed can be subjected to certain format conversion according to the type characteristics of the computing terminal, so that the number of bytes of the original picture data is reduced, and the effects of saving the access time of a user and reducing the network flow are achieved.
The following describes in detail specific principles and implementations of format conversion for pictures in step S130.
First, the basic concept of the image will be briefly described. Images are made up of pixels, which are the smallest units of information in an image, and different color models can be used to describe the pixels, and on computer graphics, the RGB color model is one of the most commonly used color models. In the RGB color model, one pixel is described in a manner of including the numbers of red (R), green (G), and blue (B). R, G and B are called components (also called channels), and the intensity value of each channel ranges between 0 and 255. Different colors can be obtained by combining channels of different intensities. Such as: red rgb (255,0,0) or hexadecimal # FF0000, blue rgb (0, 255) or hexadecimal #0000FF, and gray shade having three identical color values, e.g., rgb (238,238,238) or hexadecimal # eeeeeeee. When using the RGB color model, more than 1600 thousands (255 x 255 or 224 can yield 16,777,216 combinations) of different colors can be used in a graph. An image format capable of supporting such a plurality of colors is generally called a true color image format, and for example, JPEG and PNG of the true color type both belong to the true color image format.
In order to save storage space, a palette image format is proposed on the basis of a true color image format. One technique used in the palette image format is to extract the unique colors in the image to create a list, often called a palette (also called an index). With this color list, the entire picture can be redrawn by re-matching the entries in the palette with each pixel.
Because the palette image format utilizes an index technology to save storage space, in the embodiment of the present invention, when the original picture data corresponding to the picture information in the picture access request sent by the user is in the true color image format, the original picture data can be converted into the data in the palette image format according to the predetermined format conversion rule, so as to achieve the purpose of reducing the number of bytes.
In addition, when the original picture data corresponding to the picture information in the picture access request sent by the user is in the format of single-frame image interchange format (GIF), the original picture data can be converted into the picture data in the format of the portable network graphics PNG8 according to a preset format conversion rule; when the original picture data corresponding to the picture information in the picture access request sent by the user is in the multi-frame GIF format, the format of the original picture data can be maintained unchanged according to a predetermined format conversion rule. The specific reason is that the PNG8 format includes almost all functions of the GIF format except that it does not support animation functions, and the PNG8 format also supports an alpha transparent format (i.e., RGBA format, where a represents alpha transparent), and more importantly, the compression ratio of the PNG8 format is usually higher than that of the GIF format, so that the number of bytes of the picture data in the GIF format is significantly reduced after the picture data in the PNG8 format is converted, and the picture quality does not change significantly.
Due to the above-described features of the PNG8 format, it can be used to process picture data in the single-frame GIF format. For the picture data in the multi-frame GIF format, since the PNG8 format does not support animation, the picture data in the multi-frame GIF format may not be converted in order to retain the animation effect of the multi-frame GIF format in the present embodiment.
Fig. 2 shows an effect diagram of hundreds of degrees of logo before and after format conversion. The left graph is the original picture data in the GIF format and has a byte count of 1630B, and the right graph is the converted picture data in the PNG8 format and has a byte count of 1431B. It can be seen that after format conversion, the number of bytes of the picture is reduced by about 12%, but the picture quality does not change significantly. Specifically, the picture format conversion may be performed by using imagemask as a processing tool, or may be completed by using other software.
The conversion of the single frame GIF format to the PNG8 format is mainly described above. For picture data in formats other than the single-frame GIF format, since colors are generally rich, usually greater than 256 colors, and the PNG8 can only support 256 colors at most, if picture data in other formats (e.g., PNG, jpg formats) is forcibly converted into the PNG8 format, significant color distortion may be caused to the picture. Therefore, in the present embodiment, conversion may not be performed for picture data in other formats. Of course, if the requirement for the picture color is not high, the picture data in other formats may be converted into the picture data in the PNG8 format.
Besides the above-described conversion method for converting the single-frame GIF format into the PNG8 format, those skilled in the art can flexibly determine other format conversion methods according to actual situations, as long as the purpose of reducing the number of bytes after conversion is achieved to facilitate network transmission.
How to determine whether a GIF file is a file in a single-frame GIF format or a file in a multi-frame GIF format is described below in conjunction with structural features of the GIF file.
The structure of a GIF File can be divided into three parts, i.e., a File Header (File Header), a GIF data stream (GIF DataStream), and a File terminator (Trailer). The header contains the GIF file Signature (Signature) and Version number (Version); the GIF data stream is composed of a control identifier, an Image Block (Image Block) and other extension blocks; the file terminator has only one character (";") with a value of 0 x 3B to indicate the end of the file. Table 1 shows the composition structure of a GIF file:
TABLE 1
The following focuses on the lower GIF data stream part: as can be seen from Table 1, the GIF data Stream part (GIFData Stream) mainly includes a Logical Screen identifier (Logical Screen Descriptor), a Global Color list (Global Color Table), and an Image identifier (Image Descriptor). The image identifier part is most closely related to the present invention, and it can be seen through this part whether the GIF file belongs to the single-frame GIF format or the multi-frame GIF format. Specifically, a GIF file may contain a plurality of images, one image ending immediately followed by an identifier of the next image, the image identifier starting with a 0 x 2C (",") character, defining the properties of the image immediately following it, including the offset of the image with respect to the logical screen boundary, the image size, and the presence or absence of local color lists and color list sizes, consisting of 10 bytes.
Table 2 shows an example of an identifier of one image:
TABLE 2
Through the image identifier portion of the GIF file, it is possible to easily check how many frames of data the GIF file contains in total, the start point and the end point of each frame of data, whereby it is possible to easily determine whether the GIF file belongs to the single-frame GIF format or the multi-frame GIF format, thereby determining whether the format conversion needs to be performed.
Optionally, in order to better adapt to the actual situation of the user accessing the internet when determining whether to perform format conversion on the picture, the picture access request sent in step S110 in this embodiment may further include network type information of the computing terminal, and accordingly, step S120 further includes: and determining whether to convert the format of the picture according to the network type information of the computing terminal.
Specifically, in step S110, the network type information of the computing terminal may be included in the picture access request in a parameter form. For example, a browser of the computing terminal may recognize whether a network environment used by a user is a mobile network environment (e.g., 2G, 3G, etc.) or a wifi network environment through a ConnectivityManager function in the android system, wherein the ConnectivityManager function is used to manage operations related to network connection. When the computing terminal identifies that the network environment used by the user is a mobile network, the transmitted picture access request contains http GET [ ' NW ' ] ═ MBIL ' parameter information; when the computing terminal identifies that the network environment used by the user is a WIFI network, the sent picture access request contains httpgET [ 'NW' ] = 'WIFI' parameter information.
After determining the network type of the computing terminal according to the picture access request, in step S120, when determining whether to perform format conversion on the picture according to the network type information, a comparison table between the network type information and whether to perform format conversion may be preset and stored, and the comparison table may be searched to determine a format conversion condition corresponding to the network type information. For example, when the user is in a wifi network environment, format conversion is not required; when the user is in a mobile network environment, format conversion is required. When a format conversion rule corresponding to the network type information is set, the influence of a network environment on picture data transmission is mainly considered, for example, a wifi network belongs to a wireless local area network and has a high transmission speed, so that format conversion operation can not be executed on original picture data, and although the original picture is directly provided and more data volume needs to be transmitted, the wifi network has a good transmission condition and a high transmission speed, so that a user can not wait for a long time even if more data volume is transmitted; and the mobile network has a slightly slower transmission speed compared to the wifi network, so in order to reduce the waiting time of the user, format conversion can be performed on the picture data in the mobile network.
The influence of the network environment is considered when determining whether to convert the format of the picture, and a more appropriate picture format can be customized for the computing terminal according to the characteristics of the network where the user is located, so that the satisfaction degree of the user is improved. In specific implementation, the picture format can be set by comprehensively considering various factors such as signal quality and transmission bandwidth of the network.
Specifically, when the picture access request includes the network type information, the determination may be made based on the network type information alone or a combination of the network type information and the terminal type information when determining whether to perform format conversion on the picture. When determining whether to format-convert the picture according to the combination of the network type information and the terminal type information, the above-described comparison table between the network type information and the picture format and the comparison table between the terminal type information and the picture format may be combined in one table, and in the combined table, whether to format-convert the picture and the converted picture format are determined according to the two items of information, i.e., the network type information and the terminal type information.
In addition, it should be noted that the method of determining whether to format-convert the picture according to the network type information is equally important as the method of determining whether to format-convert the picture according to the terminal type information. Therefore, as an alternative, the picture access request in the method of the present invention may also only include the network type information, and accordingly, in the subsequent step, it is determined whether to perform format conversion on the picture only according to the network type information.
In the above description, the type of the computing terminal is described as a mobile terminal or a fixed terminal, in practical cases, the type of the computing terminal may be various, for example, the terminal type information of the computing terminal may include one or more of the following: portable computing devices, PDAs, tablet computing devices, smart phone mobile terminals, laptop computers, and desktop computers, for which corresponding format conversion rules may be set in combination with software and hardware configurations of the computing terminals, respectively.
In addition, the terminal type of the computing terminal may be further divided by a terminal screen, for example, the terminal type information of the computing terminal may further include: calculating a screen size of the terminal, and/or calculating an aspect ratio of a screen of the terminal. According to the size of the screen of the computing terminal, the computing terminal can be divided into a large-screen computing terminal and a small-screen computing terminal, and for the large-screen computing terminal, format conversion can be not carried out on the picture so as to improve the picture quality; for a small-screen computing terminal, format conversion can be performed on pictures so as to improve loading speed and reduce network traffic. According to the length-width ratio of the screen of the computing terminal, the computing terminal can be divided into a wide-screen computing terminal and a non-wide-screen computing terminal, and corresponding format conversion rules are set according to the characteristics of the wide-screen computing terminal and the non-wide-screen computing terminal. For example, according to the size and the aspect ratio of the screen, the server side on the network side can compress and crop the picture, the picture quality is more suitable for the size of the screen through compression, and the picture size is more suitable for the aspect ratio of the screen through cropping. Especially for a wide-screen computing terminal, after the picture is compressed, cut and the like, the picture cannot be deformed, distorted and the like when being displayed on the wide-screen computing terminal, so that the display effect of the picture is improved.
Meanwhile, in the above description, the network type is described as a mobile network or a wifi network, and in a practical situation, the network type may be richer, for example, one or more of the following network types are included: GPRS, CDMA, 3G, 4G, and WIFI networks, as well as various wired link networks. Specifically, the factors such as the frequency band range, transmission speed, transmission bandwidth, signal quality, interference situation and the like of various networks can be comprehensively considered for different networks to set different format conversion rules for the various networks respectively, so that balance is sought between the loading speed and the picture quality to adapt to the network transmission requirement and improve the user satisfaction.
The method provided by the embodiment of the invention can determine whether to convert the format of the picture according to one or two factors in the characteristics and the network conditions of the computing terminal, can improve the access speed of the user in a format conversion mode when needed, saves the network bandwidth and the network flow and further saves the network expense.
Fig. 3 is a schematic structural diagram illustrating a server for providing picture data to a computing terminal and the computing terminal connected to the server according to an embodiment of the present invention. As shown in fig. 3, the server 200 includes: a network interface 210, a type determiner 220, and a picture processor 230. Optionally, a picture memory 240 is also included.
The network interface 210 receives a picture access request transmitted from the computing terminal 300, the picture access request including picture information to be accessed and terminal type information of the computing terminal 300, and the network interface 210 is further adapted to transmit picture data in a predetermined format generated by a server to the computing terminal 300. When a user of the computing terminal 300 needs to access a picture through the computing terminal 300, a browser installed on the computing terminal 300 usually clicks a certain hyperlink or inputs a certain search term, so that the browser triggers the computing terminal 300 to send a picture access request to the network interface 210 in the server 200 providing services in fig. 3, where the picture access request at least needs to include picture information that the user wants to access, so that the server 200 can find the picture and provide the picture to the user. The picture access request further includes terminal type information of the computing terminal 300, so that the server 200 can know the terminal type of the computing terminal 300. Alternatively, the picture access request transmitted by the computing terminal 300 is constructed based on the HTTP protocol, and a field for indicating the terminal type information of the computing terminal 300 is contained in a user-agent (UA) part of the HTTP protocol. That is, the UA information is included in the picture access request transmitted each time the computing terminal 300 accesses a picture. The detailed contents of the UA information and the method for indicating the terminal type through the UA information refer to the description of the relevant parts in the method embodiment, and are not described herein again. In addition, besides using the UA information to indicate the terminal type of the computing terminal, in practical cases, the terminal type of the computing terminal may also be indicated in other various manners, for example, a field may also be directly set in the picture access request, which is dedicated to indicate the terminal type.
The type decider 220 acquires the terminal type information of the computing terminal 300 included in the picture access request and determines whether to format-convert the picture according to the terminal type information of the computing terminal. Specifically, when the terminal type information is included in the UA information, the terminal type may be determined by reading a field for identifying the terminal type in the UA information of the picture access request, for example, if an "Android" field or an "iPhone" field is included, it indicates that the terminal type is a mobile terminal. The specific format of the UA information and the specific manner when the type determiner determines whether to perform format conversion on the picture may refer to the descriptions of corresponding parts in the method embodiments.
When the type determiner 220 determines to perform format conversion on the picture, the picture processor 230 obtains original picture data corresponding to the picture information in the picture access request, converts the original picture data into picture data in a predetermined format according to a predetermined format conversion rule, wherein the number of bytes of the picture data in the predetermined format is smaller than the number of bytes of the original picture data, and transmits the picture data in the predetermined format to the computing terminal 300 through the network interface 210.
In this embodiment, the original picture data corresponding to the picture information may be stored by the picture memory 240, and the picture processor 230 acquires the original picture data corresponding to the picture information in the picture access request by accessing the picture memory 240. The picture storage 240 may be a single server dedicated to storing picture data, or may be a plurality of servers, each of which stores part of the picture data.
The specific manner of format conversion of the data by the picture processor 230 may refer to the description of the corresponding parts in the method embodiments, and is not described herein again.
Optionally, in order to better adapt to the actual situation of the user accessing the internet when determining whether to perform the format conversion on the picture, the picture access request sent in this embodiment may further include network type information of the computing terminal, and accordingly, the type determiner is further adapted to determine whether to perform the format conversion on the picture according to the network type information of the computing terminal.
Specifically, the network type information of the computing terminal may be included in the picture access request in the form of a parameter. For example, a browser of the computing terminal may recognize whether a network environment used by a user is a mobile network environment or a wifi network environment through a ConnectivityManager function in the android system, wherein the ConnectivityManager function is used to manage operations related to network connection. When the computing terminal identifies that the network environment used by the user is a mobile network, the sent picture access request contains httpgET [ 'NW' ] [ 'MBIL' parameter information; when the computing terminal identifies that the network environment used by the user is a WIFI network, http GET [ ' NW ' ] ═ WIFI ' parameter information is contained in the sent picture access request.
After the network type of the computing terminal is determined according to the picture access request, when the type determiner determines whether to perform format conversion on the picture according to the network type information, a comparison table between the network type information and whether to perform format conversion can be preset and stored, the comparison table is searched, and the format conversion condition corresponding to the network type information is determined. For example, when the user is in a wifi network environment, format conversion is not required; when the user is in a mobile network environment, format conversion is required. When a format conversion rule corresponding to the network type information is set, the influence of a network environment on picture data transmission is mainly considered, for example, a wifi network belongs to a wireless local area network and has a high transmission speed, so that format conversion operation can not be executed on original picture data, and although the original picture is directly provided and more data volume needs to be transmitted, the wifi network has a good transmission condition and a high transmission speed, so that a user can not wait for a long time even if more data volume is transmitted; and the mobile network has a slightly slower transmission speed compared to the wifi network, so in order to reduce the waiting time of the user, format conversion can be performed on the picture data in the mobile network.
The influence of the network environment is considered when determining whether to convert the format of the picture, and a more appropriate picture format can be customized for the computing terminal according to the characteristics of the network where the user is located, so that the satisfaction degree of the user is improved. In specific implementation, the picture format can be set by comprehensively considering various factors such as signal quality and transmission bandwidth of the network.
Specifically, when the picture access request includes the network type information, the determination may be made based on the network type information alone or a combination of the network type information and the terminal type information when determining whether to perform format conversion on the picture. When determining whether to format-convert the picture according to the combination of the network type information and the terminal type information, the above-described comparison table between the network type information and the picture format and the comparison table between the terminal type information and the picture format may be combined in one table, and in the combined table, whether to format-convert the picture and the converted picture format are determined according to the two items of information, i.e., the network type information and the terminal type information.
In addition, it should be noted that the method of determining whether to format-convert the picture according to the network type information is equally important as the method of determining whether to format-convert the picture according to the terminal type information. Therefore, as an alternative, the picture access request in the method of the present invention may also only include the network type information, and accordingly, in the subsequent step, it is determined whether to perform format conversion on the picture only according to the network type information.
In the above description, the type of the computing terminal is described as a mobile terminal or a fixed terminal, in practical cases, the type of the computing terminal may be various, for example, the terminal type information of the computing terminal may include one or more of the following: portable computing devices, PDAs, tablet computing devices, smart phone mobile terminals, laptop computers, and desktop computers, for which corresponding format conversion rules may be set in combination with software and hardware configurations of the computing terminals, respectively.
In addition, the terminal type of the computing terminal may be further divided by a terminal screen, for example, the terminal type information of the computing terminal may further include: calculating a screen size of the terminal, and/or calculating an aspect ratio of a screen of the terminal. According to the size of the screen of the computing terminal, the computing terminal can be divided into a large-screen computing terminal and a small-screen computing terminal, and for the large-screen computing terminal, format conversion can be not carried out on the picture so as to improve the picture quality; for a small-screen computing terminal, format conversion can be performed on pictures so as to improve loading speed and reduce network traffic. According to the length-width ratio of the screen of the computing terminal, the computing terminal can be divided into a wide-screen computing terminal and a non-wide-screen computing terminal, and corresponding format conversion rules are set according to the characteristics of the wide-screen computing terminal and the non-wide-screen computing terminal. For example, according to the size and the aspect ratio of the screen, the server side on the network side can compress and crop the picture, the picture quality is more suitable for the size of the screen through compression, and the picture size is more suitable for the aspect ratio of the screen through cropping. Especially for a wide-screen computing terminal, after the picture is compressed, cut and the like, the picture cannot be deformed, distorted and the like when being displayed on the wide-screen computing terminal, so that the display effect of the picture is improved.
Meanwhile, in the above description, the network type is described as a mobile network or a wifi network, and in a practical situation, the network type may be richer, for example, one or more of the following network types are included: GPRS, CDMA, 3G, 4G, and WIFI networks, as well as various wired link networks. Specifically, the factors such as the frequency band range, transmission speed, transmission bandwidth, signal quality, interference situation and the like of various networks can be comprehensively considered for different networks to set different format conversion rules for the various networks respectively, so that balance is sought between the loading speed and the picture quality to adapt to the network transmission requirement and improve the user satisfaction.
According to the method for providing the picture data to the computing terminal and the corresponding server, the format conversion of the picture can be determined according to the terminal type information of the computing terminal so as to reduce the byte number of the picture data, thereby solving the problems of low loading speed and high network flow consumption caused by large data volume when the mobile terminal accesses the picture, and obtaining the beneficial effects of enabling the mobile terminal to load the picture quickly and reducing the flow consumption when the picture is accessed.
The algorithms and displays presented herein are not inherently related to any particular computer, virtual machine, or other apparatus. Various general purpose systems may also be used with the teachings herein. The required structure for constructing such a system will be apparent from the description above. Moreover, the present invention is not directed to any particular programming language. It is appreciated that a variety of programming languages may be used to implement the teachings of the present invention as described herein, and any descriptions of specific languages are provided above to disclose the best mode of the invention.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Similarly, it should be appreciated that in the foregoing description of exemplary embodiments of the invention, various features of the invention are sometimes grouped together in a single embodiment, figure, or description thereof for the purpose of streamlining the disclosure and aiding in the understanding of one or more of the various inventive aspects. However, the disclosed method should not be interpreted as reflecting an intention that: that the invention as claimed requires more features than are expressly recited in each claim. Rather, as the following claims reflect, inventive aspects lie in less than all features of a single foregoing disclosed embodiment. Thus, the claims following the detailed description are hereby expressly incorporated into this detailed description, with each claim standing on its own as a separate embodiment of this invention.
Those skilled in the art will appreciate that the modules in the device in an embodiment may be adaptively changed and disposed in one or more devices different from the embodiment. The modules or units or components of the embodiments may be combined into one module or unit or component, and furthermore they may be divided into a plurality of sub-modules or sub-units or sub-components. All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and all of the processes or elements of any method or apparatus so disclosed, may be combined in any combination, except combinations where at least some of such features and/or processes or elements are mutually exclusive. Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise.
Furthermore, those skilled in the art will appreciate that while some embodiments described herein include some features included in other embodiments, rather than other features, combinations of features of different embodiments are meant to be within the scope of the invention and form different embodiments. For example, in the following claims, any of the claimed embodiments may be used in any combination.
The various component embodiments of the invention may be implemented in hardware, or in software modules running on one or more processors, or in a combination thereof. It will be appreciated by those skilled in the art that a microprocessor or Digital Signal Processor (DSP) may be used in practice to implement some or all of the functions of some or all of the components of a server providing picture data to a computing terminal according to embodiments of the present invention. The present invention may also be embodied as apparatus or device programs (e.g., computer programs and computer program products) for performing a portion or all of the methods described herein. Such programs implementing the present invention may be stored on computer-readable media or may be in the form of one or more signals. Such a signal may be downloaded from an internet website or provided on a carrier signal or in any other form.
It should be noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. In the claims, any reference signs placed between parentheses shall not be construed as limiting the claim. The word "comprising" does not exclude the presence of elements or steps not listed in a claim. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The invention may be implemented by means of hardware comprising several distinct elements, and by means of a suitably programmed computer. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The usage of the words first, second and third, etcetera do not indicate any ordering. These words may be interpreted as names.
Claims (17)
1. A method of providing picture data to a computing terminal, comprising the steps of:
receiving a picture access request sent by a computing terminal, wherein the picture access request comprises picture information to be accessed and terminal type information of the computing terminal;
determining whether to perform format conversion on the picture according to the terminal type information of the computing terminal;
when determining to perform format conversion on the picture, acquiring original picture data corresponding to the picture information in the picture access request, and converting the original picture data into picture data in a preset format according to a preset format conversion rule, wherein the byte number of the picture data in the preset format is smaller than the byte number of the original picture data; and
and sending the picture data with the preset format to the computing terminal.
2. The method of claim 1, wherein the picture access request further comprises network type information of the computing terminal; and the method further comprises:
and determining whether to convert the format of the picture according to the network type information of the computing terminal.
3. The method according to claim 1 or 2, wherein the terminal type information of the computing terminal comprises one or more of the following: portable computing devices, PDAs, tablet computing devices, smartphone mobile terminals, laptop computers, and desktop computers; or,
the terminal type information of the computing terminal comprises: calculating a screen size of the terminal, and/or calculating an aspect ratio of a screen of the terminal.
4. The method of claim 2, wherein the network type information of the computing terminal includes one or more of: GPRS, CDMA, 3G, 4G, WIFI, and wired link networks.
5. The method according to any of claims 1-4, wherein the picture access request is based on the HTTP protocol, and the field for indicating terminal type information of the computing terminal is included in a user agent part of the HTTP protocol.
6. The method of claim 5, wherein the network type information of the computing terminal is included in the picture access request in a parameter form.
7. The method of any of claims 1-6, the predetermined format conversion rule comprising:
and when the data format of the original picture data is determined to be a single-frame image interchange format (GIF), converting the data format of the original picture data into picture data in a portable network graphics (PNG 8) format.
8. The method of claim 7, determining whether the GIF file is a single frame image interchange format GIF based on an image identifier in a GIF file structure.
9. A server for providing picture data to a computing terminal, comprising:
the system comprises a network interface, a server and a server, wherein the network interface is suitable for receiving a picture access request sent by a computing terminal, the picture access request comprises picture information to be accessed and terminal type information of the computing terminal, and the picture data in a preset format generated by the server is transmitted to the computing terminal;
the type decider is suitable for determining whether to convert the format of the picture according to the terminal type information of the computing terminal;
and the picture processor is suitable for acquiring original picture data corresponding to the picture information in the picture access request when the type determiner determines to perform format conversion on the picture, and converting the original picture data into picture data in a preset format according to a preset format conversion rule, wherein the byte number of the picture data in the preset format is less than the byte number of the original picture data.
10. The server of claim 9, wherein,
the picture access request further includes network type information of the computing terminal,
the type decider is further adapted to determine whether to format-convert the picture according to network type information of the computing terminal.
11. The server of claim 9 or 10, the computing terminals comprising one or more of the following terminal types: portable computing devices, PDAs, tablet computing devices, smartphone mobile terminals, laptop computers, and desktop computers; or,
the terminal type information of the computing terminal comprises: calculating a screen size of the terminal, and/or calculating an aspect ratio of a screen of the terminal.
12. The server of claim 10, wherein the network of computing terminals comprises one or more of the following network types: GPRS, CDMA, 3G, 4G, and WIFI networks and wired link networks.
13. The server according to any of claims 9-12, wherein the picture access request is based on the HTTP protocol, and the field for indicating terminal type information of the computing terminal is included in a user agent part of the HTTP protocol.
14. The server according to claim 13, wherein the network type information of the computing terminal is included in the picture access request in a parameter form.
15. The server according to any of claims 10-14, wherein the predetermined format conversion rule comprises:
and when the image processor determines that the data format of the original picture data is the single-frame image interchange format GIF, converting the data format of the original picture data into the picture data in the format of the portable network graphics PNG 8.
16. The server of claim 15, wherein the image processor determines whether the GIF file is a single frame image interchange format GIF based on an image identifier in the GIF file structure.
17. The server of any of claims 9-16, further comprising:
and the picture memory is suitable for storing original picture data corresponding to the picture information.
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