CN102905045A - Method and server for providing picture data to computing terminal - Google Patents
Method and server for providing picture data to computing terminal Download PDFInfo
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- CN102905045A CN102905045A CN201210418401XA CN201210418401A CN102905045A CN 102905045 A CN102905045 A CN 102905045A CN 201210418401X A CN201210418401X A CN 201210418401XA CN 201210418401 A CN201210418401 A CN 201210418401A CN 102905045 A CN102905045 A CN 102905045A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N1/00—Scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission; Details thereof
- H04N1/32—Circuits or arrangements for control or supervision between transmitter and receiver or between image input and image output device, e.g. between a still-image camera and its memory or between a still-image camera and a printer device
- H04N1/333—Mode signalling or mode changing; Handshaking therefor
- H04N1/33376—Mode signalling or mode changing; Handshaking therefor according to characteristics or state of one of the communicating parties, e.g. available memory capacity
Abstract
The invention discloses a method and a server for providing picture data to a computing terminal. The method comprises the following steps of: receiving a picture visit request sent by the computing terminal, wherein the picture visit request comprises picture information to be visited and the terminal type information of the computing terminal; determining the compression ratio of a picture according to the terminal type information of the computing terminal; acquiring the picture data corresponding to the picture information in the picture visit request, and carrying out compression processing on the picture data according to the determined compression ratio; and sending the picture data processed by compression to the computing terminal. The problems of low loading speed and great consumed network traffic when the picture is visited by a mobile terminal are solved. The picture can be quickly loaded by the mobile terminal, and the traffic consumed when the picture is visited is reduced.
Description
Technical field
The present invention relates to image processing field, be specifically related to a kind of method and server that image data is provided to computing terminal.
Background technology
Along with the high speed development of mobile device, type and the function of mobile device are also more and more abundanter.At present, most mobile devices all provide the picture browsing function, and therefore, increasing people comes browsing pictures by mobile device.
But because the limitation of mobile device itself, for example, hardware configuration and the network bandwidth can not show a candle to some permanent plants (for example PC), therefore, adopt the mobile device browsing pictures to be easy to occur picture and load slowly even load failed situation.And, because picture general data amount is larger, with browse literal and compare, browsing pictures need to consume more network traffics, but the network traffics of at present a lot of mobile devices all are limited, so frequent browsing pictures is easy to cause the network traffics overrun, thereby increase much extra rate for the user.
In addition, along with enriching of mobile device type, it is varied that the screen size of mobile device also becomes, but, no matter towards be the mobile device of which kind of size, the image data that network side provides all is the same usually, therefore, when the user used the mobile device browsing pictures, the image content that shows on the mobile device often can't mate fully with the size of mobile device.
Summary of the invention
In view of the above problems, the present invention has been proposed in case provide a kind of overcome the problems referred to above or address the above problem at least in part provide method and the corresponding server of image data to computing terminal.
According to one aspect of the present invention, a kind of method that image data is provided to computing terminal is provided, comprise step: receive the picture access request that computing terminal sends, picture access request comprises the pictorial information that will access and the terminal type information of computing terminal; Determine the compression ratio of picture according to the terminal type information of computing terminal; Obtain the image data corresponding with the pictorial information in the picture access request, according to determined compression ratio image data is compressed processing; And the image data after the compressed processing sent to computing terminal.
Alternatively, wherein picture access request also comprises the network type information of computing terminal; And method also comprises: the compression ratio of determining picture according to the network type information of computing terminal.
Alternatively, the terminal type information of computing terminal comprises one or more in following: portable computing device, PDA, dull and stereotyped computing equipment, smart mobile phone portable terminal, laptop computer and desktop computer.
Alternatively, the terminal type information of computing terminal comprises: the screen size of computing terminal, and/or the length-width ratio of the screen of computing terminal.
Alternatively, wherein the network type information of computing terminal comprises in following one or more: GPRS, CDMA, 3G, 4G and WIFI network.
Alternatively, picture access request is based on http protocol, and the field that is used to indicate the terminal type information of computing terminal is included in user agent's part of http protocol.
Alternatively, wherein the network type information of computing terminal is included in the picture access request with parametric form.
Alternatively, determine that according to terminal type information the step of the compression ratio of picture comprises: set in advance and the compression ratio of storage terminal type information and picture between the table of comparisons, search the table of comparisons, the compression ratio of definite picture corresponding with terminal type information; And determine that according to network type information the step of the compression ratio of picture comprises: set in advance and the compression ratio of storage networking type information and picture between the table of comparisons, search the table of comparisons, the compression ratio of definite picture corresponding with network type information.
Alternatively, according to determined compression ratio the step that image data compresses processing is comprised: color conversion, dct transform, quantification and coding wherein, quantize further to comprise: the quality factor when determining to quantize according to compression ratio; Quantize by the definite step-length that quantizes of quality factor and according to step-length.
According to a further aspect in the invention, a kind of server that image data is provided to computing terminal is provided, comprise: network interface, be suitable for receiving the picture access request that computing terminal sends, picture access request comprises the pictorial information that will access and the terminal type information of computing terminal, and the image data that server generates is transferred to computing terminal; The type decision device is suitable for obtaining the terminal type information of the computing terminal that comprises in the picture access request; The compression ratio determinant, the terminal type information that is suitable for the computing terminal that obtains according to the type decision device is determined the compression ratio of picture; Picture processor is suitable for obtaining the image data corresponding with the pictorial information in the picture access request, according to determined compression ratio image data is compressed processing, and via network interface the image data of compressed processing is transferred to computing terminal; And picture memory, be suitable for storing the corresponding image data of pictorial information.
Alternatively, wherein, picture access request also comprises the network type information of computing terminal, the type decision device also is suitable for obtaining the network type information of the computing terminal that comprises in the picture access request, and the compression ratio determinant also is suitable for determining according to the network type information of computing terminal the compression ratio of picture.
Alternatively, computing terminal comprises one or more in the following terminal type: portable computing device, PDA, dull and stereotyped computing equipment, smart mobile phone portable terminal, laptop computer and desktop computer.
Alternatively, the terminal type information of computing terminal comprises: the screen size of computing terminal, and/or the length-width ratio of the screen of computing terminal.
Alternatively, wherein the network of computing terminal comprises in the following network type one or more: GPRS, CDMA, 3G, 4G and WIFI network.
Alternatively, picture access request is based on http protocol, and the field that is used to indicate the terminal type information of computing terminal is included in user agent's part of http protocol.
Alternatively, wherein the network type information of computing terminal is included in the picture access request with parametric form.
Alternatively, the compression ratio determinant is further adapted for: set in advance and the compression ratio of storage terminal type information or network type information and picture between the table of comparisons, search the table of comparisons, the compression ratio of definite picture corresponding with terminal type or network type.
Alternatively, picture processor is further adapted for carries out color conversion, dct transform, quantification and coding to image data, wherein, quantizes further to comprise: the quality factor when determining to quantize according to compression ratio; Quantize by the definite step-length that quantizes of quality factor and according to step-length.
According to method and the corresponding server that image data is provided to computing terminal of the present invention, compression ratio in the time of can determining picture compressed according to the terminal type information of computing terminal also compresses picture according to the compression ratio of determining, the problem that loading velocity is slow and the consumption network flow is many when having solved thus the mobile terminal accessing picture, obtained portable terminal is Loaded Image rapidly, and the beneficial effect of the traffic consumes when having reduced picture access.And, provide method and the corresponding server of image data to computing terminal among the present invention, can also further determine the screen size information of computing terminal, according to the screen size of computing terminal to processing modes such as picture compress, so that the image content that shows on the computing terminal can be complementary with the size of terminal.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above and other objects of the present invention, feature and advantage can be become apparent, below especially exemplified by the specific embodiment of the present invention.
Description of drawings
By reading hereinafter detailed description of the preferred embodiment, various other advantage and benefits will become cheer and bright for those of ordinary skills.Accompanying drawing only is used for the purpose of preferred implementation is shown, and does not think limitation of the present invention.And in whole accompanying drawing, represent identical parts with identical reference symbol.In the accompanying drawings:
Fig. 1 shows the method flow diagram that image data is provided to computing terminal according to an embodiment of the invention;
Fig. 2 a to Fig. 2 c show respectively according to the method that image data is provided to computing terminal provided by the invention picture is arranged compression ratio and compress before and the display effect on the computing terminal of mobile type afterwards; And
Fig. 3 shows according to an embodiment of the invention and provides the server of image data and the computing terminal that links to each other with this server to computing terminal.
Embodiment
Exemplary embodiment of the present disclosure is described below with reference to accompanying drawings in more detail.Although shown exemplary embodiment of the present disclosure in the accompanying drawing, yet should be appreciated that and to realize the disclosure and the embodiment that should do not set forth limits here with various forms.On the contrary, it is in order to understand the disclosure more thoroughly that these embodiment are provided, and can with the scope of the present disclosure complete convey to those skilled in the art.
Fig. 1 shows the method flow diagram that image data is provided to computing terminal according to an embodiment of the invention.
As shown in Figure 1, the method starts from step S110, in step S110, receives the picture access request that computing terminal sends, and comprises the pictorial information that will access and the terminal type information of computing terminal in this picture access request.
Alternatively; step S110 can realize in the following way: when the user of computing terminal need to access picture by computing terminal; usually can click certain hyperlink or input the modes such as certain search word by the browser of installing on the computing terminal; thereby trigger computing terminal by browser and send picture access request to the equipment such as server that service is provided; at least need to comprise the pictorial information that the user will access in this picture access request; so that server can find this picture and offer the user; and the terminal type information of computing terminal, so that server is understood the terminal type of computing terminal.Alternatively, the picture access request that computing terminal sends is constructed based on http protocol, and the field that is used to indicate the terminal type information of computing terminal is included in user agent (user-agent is hereinafter to be referred as the UA) part of http protocol.That is to say, all comprise UA information in the picture access request that sends during the every less important access picture of computing terminal.
For the ease of understanding the present invention, below simply introduce first the particular content of UA information.UA is a special head of string, can comprise a series of relevant informations relevant for computing terminal in this head of string, for example, the employed operating system of computing terminal and version, cpu type, browser type and version, browser renders engine, browser language, browser plug-in etc.Generally, the reference format of UA is: the browser sign; The operating system sign; The secret grade sign; The browser language; The render engine sign; Version information, wherein, the browser sign is the word string of shape such as the mark navigator product such as Mozilla/5.0 or Opera/7.54; Common operating system sign comprises: FreeBSD, Linux, Mac, Solaris and Windows etc.; The secret grade sign is such as using " N " expression without safety encipher, the weak safety encipher of usefulness " I " expression and the strong safety encipher of " U " expression etc.; The browser language is the language of appointment in the choice of language in the conventional tags of preference of browser; Render engine for example can be the Presto render engine, and form is: Presto/ version number; The true version information of display navigation device in the browser version information, form is Version/ version number.
In above-mentioned a series of information that UA comprises, maximally related with the present invention is the information that can reflect the terminal type of computing terminal, for example, and the operating system sign.Can identify easily the terminal type of computing terminal by the operating system sign.At present, the operating system of the portable terminal of main flow generally adopts the iOS(Apple Macintosh operating system on the market) or Android(google Android operating system), therefore, if operating system is above-mentioned two types, the terminal type that then can determine computing terminal is portable terminal.For example, the UA information shape such as the Mozilla/5.0 (Linux that comprise in the picture access request that sends during Android user's accessed web page; U; Android 3.1; Zh-cn; GT-P7310 Build/HMJ37) AppleWebKit/534.13 (KHTML, like Gecko) Version/4.0 Mobile Safari/534.1, wherein, it is the Android system that " Android " field is clearly expressed the operating system that the computing terminal equipment that sends this picture access request adopts, therefore, the terminal type that represents this computing terminal is portable terminal; The UA information shape that comprises in the picture access request that sends during Iphone user's accessed web page such as Mozilla/5.0 (iPhone; CPU iPhone OS 5_0 like Mac OS X) AppleWebKit/534.46 (KHTML, like Gecko) Version/5.1Mobile/9A334 Safari/7534.48.3, wherein, what " iPhone " field expressed clearly that the computing terminal equipment that sends this picture access request adopts is iPhone equipment, its corresponding operating system is the iOS system, therefore, the terminal type that also represents this computing terminal is portable terminal.In addition, in order further to improve the type Accuracy of Judgement, can also be further combined with other information among the UA, comprehensively judge such as version information etc.
It is a kind of schematic mode that above-described employing UA information is indicated the mode of the terminal type of computing terminal, in actual conditions, can also adopt other various ways to indicate the terminal type of computing terminal, for example, also a field can be set in picture access request directly, be specifically designed to the indicating terminal type.
Execute after the above-mentioned steps S110, in step S120, need to determine according to the terminal type information of computing terminal the compression ratio of picture.
Because the software and hardware difference between the dissimilar computing terminal, the performance when causing its browsing pictures is also incomplete same.For example, the screen size less of portable terminal, resolution are relatively low, therefore, also relatively low to the susceptibility of picture quality.So, when the terminal type of computing terminal is portable terminal, the compression ratio of picture can be arranged higher a little, sacrifice to a certain extent picture quality to reduce the use of customer flow, reduce the customer flow rate, shorten the loading of picture on portable terminal consuming time.Because the screen size of fixed terminal (for example desktop PC) is larger, resolution is also relatively high, so, when the terminal type of computing terminal is fixed terminal, the compression ratio of picture can be arranged lower a little, to improve picture quality, alternatively, compression ratio that can fixed terminal is set to 1, does not namely compress, keep former figure, in order to provide the most clearly picture for the user.Particularly, in order in step S120, to determine easily picture compression ratio corresponding to various types of computing terminals, can arrange in advance and store the table of comparisons between a terminal type and the compression ratio, by searching this table of comparisons, determine the compression ratio corresponding with terminal type.
Determine after the compression ratio of picture, in step S130, obtain the image data corresponding with the pictorial information in the picture access request, according to determined compression ratio among the step S120 image data that obtains is compressed processing.
In the present embodiment, can store the corresponding image data of pictorial information by picture memory, obtain the image data corresponding with the pictorial information in the picture access request by accessing this picture memory.Wherein, this picture memory can be an independent server, is specifically designed to store picture data, also can be some station servers, every station server storage area image data.After getting access to the image data corresponding with the pictorial information in the picture access request, need to compress processing to this image data according to the compression ratio of determining among the step S120.
The below introduces in detail among the step S130 according to compression ratio with the boil down to example of the image data of jpeg format image data is compressed a kind of processing mode when processing.When being compressed, the image data of jpeg format mainly is divided into color conversion, dct transform, quantification and four steps of coding.
Paper is the color conversion step once.Because jpeg format is only supported the data structure of YUV color mode, and do not support the data structure of RGB color mode, so before colour picture is compressed, if image data is the RGB color mode, then must be converted into first the YUV color mode, thereby finish the color conversion step.
Be converted to after the YUV color mode, need to carry out dct transform.So-called dct transform refers to picture signal to isolate the processing procedure of high and low frequency information, and then the HFS (being image detail) of image is compressed, to reach the purpose of compressing image data in the enterprising line translation of frequency domain.When dct transform, usually first image is divided into a plurality of 8 * 8 matrix.Then each matrix is made dct transform, obtain a matrix of frequency coefficients after the conversion, coefficient of frequency wherein all is floating number.
Because the code book that uses in the cataloged procedure of back all is integer, therefore, executes after the dct transform, also needs the coefficient of frequency after the conversion is quantized, and is converted into integer.Because carry out after data quantize, the data in the matrix all are approximations, and difference, this difference have been arranged between the raw image data is to cause the main cause of distortion after the image compression.In this course, need to select a quality factor, choosing of this quality factor is most important: value is selected too much, can increase substantially compression ratio, but picture quality is just poor; Otherwise, quality factor less (minimum is 1), the image reconstruction quality is better, but compression ratio is lower.To this, ISO has formulated one group of criterion and quantity value for the jpeg code implementor.
In the process in front, be accomplished to coding from color conversion before, image is not further compressed, dct transform and to quantize all be to prepare for coding stage.Coding adopts two kinds of mechanism: one is the run length encoding of 0 value; The 2nd, entropy coding (Entropy Coding).In JPEG, adopt the song sequence of wandering, namely make element in " it " word arrangement matrix with the normal direction of diagonal of a matrix.The advantage of doing like this be so that near the larger arrangement of elements in the matrix upper left corner, value in the front of stroke, and the matrix element that arrange the back of stroke is essentially 0 value.Run length encoding is coded system very simple and commonly used, does not repeat them here.Coding is actually a kind of coding method based on statistical property.In JPEG, allow to adopt HUFFMAN coding or arithmetic coding.
Can see by top processing procedure, generally, in the compression process of whole JPEG picture, that can control only has quality factor Q, therefore, can be in quantizing process, the value of the quality factor Q when recently determining to quantize according to the compression of determining among the step S120 quantizes by the definite step-length that quantizes of quality factor Q and according to step-length.During specific implementation, different realization standards have different definition to the quality factor Q.For example, IJG(Independent Jpeg Group, independent Jpeg group) metric that adopts is that the 99(compressibility factor is the highest) ~ the 1(compressibility factor is minimum); Photoshop has formulated 1 ~ 12 grade of compressibility factor; Apple has defined 0 ~ 4 grade of compressibility factor; The compressibility factor of Paint Shop Pro is opposite with the compressibility factor of IJG---and the 99 expression lowest compression factors, 1 is the maximal pressure contracting factor.In the present embodiment, can adopt the quality factor of IJG as tolerance.For example, when computing terminal was portable terminal, can quality factor being set to the 60(occurrence can decide on actual conditions).
Above-described compress mode only is exemplary, and those skilled in the art can also choose flexibly other mode and according to compression ratio picture be compressed.
After compression is processed to image data, execution in step S140.In step S140, the image data after the compressed processing is sent to computing terminal.Take by computing terminal as example as portable terminal, although image data has been carried out squeeze operation, reduced the quality of picture,, the reason such as screen size little low owing to the resolution of portable terminal itself, the user can perceive the reduction of picture quality hardly.Simultaneously, because data volume reduces after the compression, therefore, greatly improved the picture loading velocity, and reduced network traffics.
Alternatively, for when picture compression being set comparing, the actual conditions that can adapt to better user's online, can further include the network type information of computing terminal in the picture access request that in the step S110 of the present embodiment, sends, correspondingly, in step S120, further comprise: the compression ratio of determining picture according to the network type information of computing terminal.
Particularly, in step S110, the network type information of computing terminal can be included in the picture access request with parametric form.For example, the browser of computing terminal can be mobile network environment or wifi network environment by the used network environment of the identification user of the ConnectivityManager parameter in the Android system, wherein, the ConnectivityManager parameter is used for the management operation relevant with network connection.When computing terminal identifies the used network environment of user and is the mobile network, in the picture access request that sends, comprise http GET[' NW ']=' MBIL ' parameter information; When computing terminal identifies the used network environment of user and is the wifi network, in the picture access request that sends, comprise http GET[' NW ']=' WIFI ' parameter information.
Determine according to picture access request after the network type of computing terminal, in step S120, when determining the compression ratio of picture according to network type information, can set in advance and store the table of comparisons between the compression ratio of a network type information and picture, search this table of comparisons, determine the compression ratio of the picture corresponding with network type information.For example, when the user was in the wifi network environment, picture compression was lower; When the user is in mobile network environment, the compression ratio of picture higher (the concrete numerical value of compression ratio can be set according to actual conditions).When the compression ratio of picture corresponding to setting network type information, mainly be to consider that network environment is on the impact of image data transmission, for example, the wifi network belongs to WLAN (wireless local area network), transmission speed is very fast, therefore, can be the lower compression ratio of computing terminal setting in the wifi network environment, so that the picture of better quality to be provided, although provide the picture of better quality need to transmit more data volume, because the transmission conditions of wifi network are better, transmission speed is fast, therefore, even transmit more data volume, can not make the user wait for the very long time yet; And the mobile network is with respect to the wifi network, and transmission speed is slightly slow, therefore, in order to reduce user's stand-by period, the picture quality of the computing terminal among the mobile network can be arranged slightly lower, that is, compression ratio arranges slightly higherly.
Arrange picture compression than the time consider according to the characteristics of user place network, to be the impact of network environment the customized more reasonably compression ratio of computing terminal, thereby to improve user's satisfaction.During specific implementation, the many factors such as signal quality, transmission bandwidth that can also consider network is set compression ratio.
Particularly, when comprising network type information in the picture access request, definite picture compression than the time, can determine separately the compression ratio of picture according to network type information, also can determine according to the combination of network type information and terminal type both information the compression ratio of picture.When determining the compression ratio of picture according to the combination of network type information and terminal type both information, the table of comparisons between the table of comparisons between the compression ratio of above-described network type information and picture and the compression ratio of terminal type information and picture can be combined in the table, in the table after combination, jointly determine the picture compression ratio according to network type information and these two information of terminal type information.For example, when network type information is the wifi network, and terminal type is when being portable terminal, and the picture compression ratio is 50.
In addition, mode as an alternative, the picture access request in the method for the present invention also can only comprise network type information, correspondingly, only determines the compression ratio of picture according to network type information in subsequent step.
In the superincumbent description, take the type of computing terminal as portable terminal or fixed terminal is described as example, in actual conditions, the type of computing terminal can be diversified, for example, the terminal type information of computing terminal can comprise one or more in following: portable computing device, PDA, dull and stereotyped computing equipment, smart mobile phone portable terminal, laptop computer and desktop computer, computing terminal for these types, can in conjunction with the software and hardware configuration of computing terminal, corresponding picture compression ratio be set respectively.
In addition, the terminal type of computing terminal can also be divided by terminal screen, and for example, the terminal type information of computing terminal can also comprise: the screen size of computing terminal, and/or the length-width ratio of the screen of computing terminal.According to the screen size of computing terminal, computing terminal can be divided into large-screen computing terminal and the small screen computing terminal, for the large-screen computing terminal, compression ratio can be arranged slightly low, to improve picture quality; For the small screen computing terminal, compression ratio can be arranged slightly high, reduce network traffics to improve loading velocity.Length-width ratio according to the screen of computing terminal can be divided into computing terminal widescreen computing terminal and non-widescreen computing terminal, according to the characteristics of widescreen and non-widescreen computing terminal, corresponding picture compression ratio is set.For example, according to size and the length-width ratio of screen, the server end of network side is compressed and cutting, by compression to picture, make picture quality be more suitable for the size of screen, by cutting, make dimension of picture be more suitable for the length-width ratio of screen, like this, when Showing Picture on the computing terminal, not only loading velocity is fast, and dimension of picture also is complementary with the size of screen.Especially for the computing terminal of widescreen, picture has passed through after the processing such as compression and cutting, just can not occur the situations such as metamorphopsic distortion when being presented on the widescreen computing terminal, thereby has improved the display effect of picture.
Simultaneously, in the superincumbent description, take network type as the mobile network or the wifi network be described as example, in actual conditions, network type may be abundanter, for example, comprises in the following network type one or more: GPRS, CDMA, 3G, 4G and WIFI network.Particularly, the factors such as frequency band range, transmission speed, transmission bandwidth, signal quality and disturbed condition that can consider diverse network for different networks are respectively diverse network different compression ratios are set, thereby seeking balance between loading velocity and picture quality, to adapt to the Internet Transmission demand, improve user satisfaction.
Fig. 2 a to Fig. 2 c show respectively according to method provided by the invention picture is arranged compression ratio and compress before and after display effect on the computing terminal of mobile type.Wherein, Fig. 2 a has shown the design sketch that directly original image of uncompressed is offered portable terminal, and the dimension of picture among Fig. 2 a is 380 * 380, and quality factor is 100, and the picture byte number is 81.9KB.Fig. 2 b has shown the picture that portable terminal provides at the wifi net environment, and the dimension of picture among Fig. 2 b is identical with Fig. 2 a, and quality factor is 80, and the picture byte number is 20.2KB.Fig. 2 c has shown the picture that portable terminal provides under mobile network environment, the dimension of picture among Fig. 2 c is also identical with Fig. 2 a, and quality factor is 60, and the picture byte number is 13.3KB.Can find out, after the picture that shows on the portable terminal is compressed, represent effect and there is no significant difference, but the picture byte number but obviously dwindle, therefore, greatly improve loading velocity, reduce network traffics.
What Fig. 3 showed that the embodiment of the invention provides provides the server of image data and the structural representation of the computing terminal that links to each other with this server to computing terminal.As shown in Figure 3, server 300 comprises: network interface 310, type decision device 320, compression ratio determinant 330, picture processor 340 and picture memory 350.
Network interface 310 receives the picture access request that computing terminal 200 sends, this picture access request comprises the pictorial information that will access and the terminal type information of computing terminal 200, and network interface 310 also is suitable for the image data that server generates is transferred to computing terminal 200.When the user of computing terminal 200 need to access picture by computing terminal 200; usually can click certain hyperlink or input the mode such as certain search word by the browser of installing on the computing terminal 200; thereby the network interface 310 that is triggered computing terminal 200 and provided in Fig. 3 by browser in the server 300 of service sends picture access request; at least server 300 needs in this picture access request to comprise the pictorial information that the user will access, so that can find this picture and offer the user.The terminal type information that also comprises computing terminal 200 in the picture access request is so that server 300 is understood the terminal type of computing terminal 200.Alternatively, the picture access request that computing terminal 200 sends is constructed based on http protocol, and the field that is used to indicate the terminal type information of computing terminal 200 is included in user agent (user-agent is hereinafter to be referred as the UA) part of http protocol.That is to say, all comprise UA information in the picture access request that sends during computing terminal 200 every less important access picture.But the particular content of relevant UA information and the description of passing through relevant portion among the method reference method embodiment of UA information indicating terminal type repeat no more herein.In addition, except adopting UA information to indicate the terminal type of computing terminal, in actual conditions, can also adopt other various ways to indicate the terminal type of computing terminal, for example, also a field can be set in picture access request directly, be specifically designed to the indicating terminal type.
The terminal type information of the computing terminal 200 that compression ratio determinant 330 obtains according to type decision device 320 is determined the compression ratio of picture.Because the software and hardware difference between the dissimilar computing terminal, the performance when causing its browsing pictures is also incomplete same.For example, the screen size less of portable terminal, resolution are relatively low, therefore, also relatively low to the susceptibility of picture quality.So, when the terminal type of computing terminal is portable terminal, the compression ratio of picture can be arranged higher a little, sacrifice to a certain extent picture quality to reduce the use of customer flow, reduce the customer flow rate, shorten the loading of picture on portable terminal consuming time.Because the screen size of fixed terminal (for example desktop PC) is larger, resolution is also relatively high, so, when the terminal type of computing terminal is fixed terminal, the compression ratio of picture can be arranged lower a little, to improve picture quality, alternatively, compression ratio that can fixed terminal is set to 1, does not namely compress, keep former figure, in order to provide the most clearly picture for the user.Particularly, can determine easily the picture compression ratio that various types of computing terminals are corresponding in order to make compression ratio determinant 330, can be at the table of comparisons that arranges in advance on the server 300 and store between a terminal type and the compression ratio, by searching this table of comparisons, determine the compression ratio corresponding with terminal type.
Particularly, picture processor 340 can be passed through the steps such as color conversion, dct transform, quantification and coding and realize when image data is compressed, and wherein, quantization step further comprises: the quality factor when determining to quantize according to compression ratio; Quantize by the definite step-length that quantizes of quality factor and according to step-length.Wherein, but the method during to the compression of the image data of jpeg format among the specific implementation reference method embodiment of each step.Perhaps, picture processor 340 also can be come according to compression ratio picture to be compressed by other means.
Image data is transferred to computing terminal 200 via network interface 310 after overcompression.Take by computing terminal as example as portable terminal, although image data has been carried out squeeze operation, reduced the quality of picture,, the reason such as screen size little low owing to the resolution of portable terminal itself, the user can perceive the reduction of picture quality hardly.Simultaneously, because data volume reduces after the compression, therefore, greatly improved the picture loading velocity, and reduced network traffics.
Alternatively, for when picture compression being set comparing, the actual conditions that can adapt to better user's online, can further include the network type information of computing terminal in the picture access request that the network interface 310 of the present embodiment receives, correspondingly, type decision device 320 is further used for determining the network type of computing terminal, and the network type of the computing terminal that compression ratio determinant 330 is further determined according to type decision device 320 is determined the compression ratio of picture.
Particularly, the network type information of computing terminal can be included in the picture access request with parametric form.For example, the browser of computing terminal can be mobile network environment or wifi network environment by the used network environment of the identification user of the ConnectivityManager parameter in the Android system, wherein, the ConnectivityManager parameter is used for the management operation relevant with network connection.When computing terminal identifies the used network environment of user and is the mobile network, in the picture access request that sends, comprise http GET[' NW ']=' MBIL ' parameter information; When computing terminal identifies the used network environment of user and is the wifi network, in the picture access request that sends, comprise http GET[' NW ']=' WIFI ' parameter information.Type decision device 320 is determined the network type of computing terminal according to the parameter in the picture access request.When compression ratio determinant 330 is determined the compression ratio of picture according to network type information, also can set in advance and store the table of comparisons between the compression ratio of a network type information and picture, search this table of comparisons, determine the compression ratio of the picture corresponding with network type information.For example, when the user was in the wifi network environment, picture compression was lower; When the user is in mobile network environment, the compression ratio of picture higher (the concrete numerical value of compression ratio can be set according to actual conditions).When the compression ratio of picture corresponding to setting network type information, mainly be to consider that network environment is on the impact of image data transmission, for example, the wifi network belongs to WLAN (wireless local area network), transmission speed is very fast, therefore, can be the lower compression ratio of computing terminal setting in the wifi network environment, so that the picture of better quality to be provided, although provide the picture of better quality need to transmit more data volume, because the transmission conditions of wifi network are better, transmission speed is fast, therefore, even transmit more data volume, can not make the user wait for the very long time yet; And the mobile network is with respect to the wifi network, and transmission speed is slightly slow, therefore, in order to reduce user's stand-by period, the picture quality of the computing terminal among the mobile network can be arranged slightly lower, that is, compression ratio arranges slightly higherly.
Arrange picture compression than the time consider according to the characteristics of user place network, to be the impact of network environment the customized more reasonably compression ratio of computing terminal, thereby to improve user's satisfaction.During specific implementation, the many factors such as signal quality, transmission bandwidth that can also consider network is set compression ratio.
Particularly, when comprising network type information in the picture access request, when compression ratio determinant 330 compares in definite picture compression, can determine separately the compression ratio of picture according to network type information, also can determine according to the combination of network type information and terminal type both information the compression ratio of picture.When determining the compression ratio of picture according to the combination of network type information and terminal type both information, the table of comparisons between the table of comparisons between the compression ratio of above-described network type information and picture and the compression ratio of terminal type information and picture can be combined in the table, in the table after combination, jointly determine the picture compression ratio according to network type information and these two information of terminal type information.For example, when network type information is the wifi network, and terminal type is when being portable terminal, and the picture compression ratio is 50.
In addition, mode as an alternative, picture access request of the present invention also can only comprise network type information, correspondingly, 330 compression ratios of determining picture according to network type information of compression ratio determinant.
In the superincumbent description, take the type of computing terminal as portable terminal or fixed terminal is described as example, in actual conditions, the type of computing terminal can be diversified, for example, the terminal type information of computing terminal can comprise one or more in following: portable computing device, PDA, dull and stereotyped computing equipment, smart mobile phone portable terminal, laptop computer and desktop computer, computing terminal for these types, can in conjunction with the software and hardware configuration of computing terminal, corresponding picture compression ratio be set respectively.
In addition, the terminal type of computing terminal can also be divided by terminal screen, and for example, the terminal type information of computing terminal can also comprise: the screen size of computing terminal, and/or the length-width ratio of the screen of computing terminal.According to the screen size of computing terminal, computing terminal can be divided into large-screen computing terminal and the small screen computing terminal, for the large-screen computing terminal, compression ratio can be arranged slightly low, to improve picture quality; For the small screen computing terminal, compression ratio can be arranged slightly high, reduce network traffics to improve loading velocity.Length-width ratio according to the screen of computing terminal can be divided into computing terminal widescreen computing terminal and non-widescreen computing terminal, according to the characteristics of widescreen and non-widescreen computing terminal, corresponding picture compression ratio is set.For example, according to size and the length-width ratio of screen, the server end of network side is compressed and cutting, by compression to picture, make picture quality be more suitable for the size of screen, by cutting, make dimension of picture be more suitable for the length-width ratio of screen, like this, when Showing Picture on the computing terminal, not only loading velocity is fast, and dimension of picture also is complementary with the size of screen.Especially for the computing terminal of widescreen, picture has passed through after the processing such as compression and cutting, just can not occur the situations such as metamorphopsic distortion when being presented on the widescreen computing terminal, thereby has improved the display effect of picture.
Simultaneously, in the superincumbent description, take network type as the mobile network or the wifi network be described as example, in actual conditions, network type may be abundanter, for example, comprises in the following network type one or more: GPRS, CDMA, 3G, 4G and WIFI network.Particularly, the factors such as frequency band range, transmission speed, transmission bandwidth, signal quality and disturbed condition that can consider diverse network for different networks are respectively diverse network different compression ratios are set, thereby seeking balance between loading velocity and picture quality, to adapt to the Internet Transmission demand, improve user satisfaction.
According to method and the corresponding server that image data is provided to computing terminal of the present invention, compression ratio in the time of can determining picture compressed according to the terminal type information of computing terminal also compresses picture according to the compression ratio of determining, the problem that loading velocity is slow and the consumption network flow is many when having solved thus the mobile terminal accessing picture, obtained portable terminal is Loaded Image rapidly, and the beneficial effect of the traffic consumes when having reduced picture access.
Intrinsic not relevant with any certain computer, virtual system or miscellaneous equipment with demonstration at this algorithm that provides.Various general-purpose systems also can be with using based on the teaching at this.According to top description, it is apparent constructing the desired structure of this type systematic.In addition, the present invention is not also for any certain programmed language.Should be understood that and to utilize various programming languages to realize content of the present invention described here, and the top description that language-specific is done is in order to disclose preferred forms of the present invention.
In the specification that provides herein, a large amount of details have been described.Yet, can understand, embodiments of the invention can be in the situation that there be these details to put into practice.In some instances, be not shown specifically known method, structure and technology, so that not fuzzy understanding of this description.
Similarly, be to be understood that, in order to simplify the disclosure and to help to understand one or more in each inventive aspect, in the description to exemplary embodiment of the present invention, each feature of the present invention is grouped together in single embodiment, figure or the description to it sometimes in the above.Yet the method for the disclosure should be construed to the following intention of reflection: namely the present invention for required protection requires the more feature of feature clearly put down in writing than institute in each claim.Or rather, as following claims reflected, inventive aspect was to be less than all features of the disclosed single embodiment in front.Therefore, follow claims of embodiment and incorporate clearly thus this embodiment into, wherein each claim itself is as independent embodiment of the present invention.
Those skilled in the art are appreciated that and can adaptively change and they are arranged in one or more equipment different from this embodiment the module in the equipment among the embodiment.Can be combined into a module or unit or assembly to the module among the embodiment or unit or assembly, and can be divided into a plurality of submodules or subelement or sub-component to them in addition.In such feature and/or process or unit at least some are mutually repelling, and can adopt any combination to disclosed all features in this specification (comprising claim, summary and the accompanying drawing followed) and so all processes or the unit of disclosed any method or equipment make up.Unless in addition clearly statement, disclosed each feature can be by providing identical, being equal to or the alternative features of similar purpose replaces in this specification (comprising claim, summary and the accompanying drawing followed).
In addition, those skilled in the art can understand, although embodiment more described herein comprise some feature rather than further feature included among other embodiment, the combination of the feature of different embodiment means and is within the scope of the present invention and forms different embodiment.For example, in the following claims, the one of any of embodiment required for protection can be used with compound mode arbitrarily.
All parts embodiment of the present invention can realize with hardware, perhaps realizes with the software module of moving at one or more processor, and perhaps the combination with them realizes.It will be understood by those of skill in the art that and to use in practice microprocessor or digital signal processor (DSP) to realize providing some or all some or repertoire of parts in the server of image data according to the embodiment of the invention to computing terminal.The present invention can also be embodied as be used to part or all equipment or the device program (for example, computer program and computer program) of carrying out method as described herein.Such realization program of the present invention can be stored on the computer-readable medium, perhaps can have the form of one or more signal.Such signal can be downloaded from internet website and obtain, and perhaps provides at carrier signal, perhaps provides with any other form.
It should be noted above-described embodiment the present invention will be described rather than limit the invention, and those skilled in the art can design alternative embodiment in the situation of the scope that does not break away from claims.In the claims, any reference symbol between bracket should be configured to limitations on claims.Word " comprises " not to be got rid of existence and is not listed in element or step in the claim.Being positioned at word " " before the element or " one " does not get rid of and has a plurality of such elements.The present invention can realize by means of the hardware that includes some different elements and by means of the computer of suitably programming.In having enumerated the unit claim of some devices, several in these devices can be to come imbody by same hardware branch.The use of word first, second and C grade does not represent any order.Can be title with these word explanations.
Claims (18)
1. method that image data is provided to computing terminal comprises step:
Receive the picture access request that computing terminal sends, described picture access request comprises the pictorial information that will access and the terminal type information of computing terminal;
Determine the compression ratio of picture according to the terminal type information of described computing terminal;
Obtain the image data corresponding with the pictorial information in the described picture access request, according to determined compression ratio described image data is compressed processing; And
Image data after the compressed processing is sent to described computing terminal.
2. the method for claim 1, wherein said picture access request also comprises the network type information of described computing terminal; And described method also comprises:
Determine the compression ratio of described picture according to the network type information of described computing terminal.
3. method as claimed in claim 1 or 2, the terminal type information of described computing terminal comprise one or more in following: portable computing device, PDA, dull and stereotyped computing equipment, smart mobile phone portable terminal, laptop computer and desktop computer.
4. method as claimed in claim 1 or 2, the terminal type information of described computing terminal comprises: the screen size of computing terminal, and/or the length-width ratio of the screen of computing terminal.
5. method as claimed in claim 2, the network type information of wherein said computing terminal comprise one or more in following: GPRS, CDMA, 3G, 4G and WIFI network.
6. such as any described method among the claim 1-5, described picture access request is based on http protocol, and the field that is used to indicate the terminal type information of computing terminal is included in user agent's part of http protocol.
7. method as claimed in claim 6, the network type information of wherein said computing terminal is included in the described picture access request with parametric form.
8. such as any described method among the claim 2-7, describedly determine that according to described terminal type information the step of the compression ratio of picture comprises:
Set in advance and store the table of comparisons between the compression ratio of described terminal type information and picture, search the described table of comparisons, determine the compression ratio of the picture corresponding with described terminal type information; And
Describedly determine that according to described network type information the step of the compression ratio of picture comprises:
Set in advance and store the table of comparisons between the compression ratio of described network type information and picture, search the described table of comparisons, determine the compression ratio of the picture corresponding with described network type information.
9. such as any described method among the claim 1-8, describedly according to determined compression ratio the step that described image data compresses processing is comprised: color conversion, dct transform, quantification and coding, wherein, described quantification further comprises:
Quality factor when determining to quantize according to described compression ratio;
Quantize by the definite step-length that quantizes of described quality factor and according to described step-length.
10. server that image data is provided to computing terminal comprises:
Network interface is suitable for receiving the picture access request that computing terminal sends, and described picture access request comprises the pictorial information that will access and the terminal type information of computing terminal, and the image data that server generates is transferred to described computing terminal;
The type decision device is suitable for obtaining the terminal type information of the described computing terminal that comprises in the described picture access request;
The compression ratio determinant, the terminal type information that is suitable for the described computing terminal that obtains according to described type decision device is determined the compression ratio of picture;
Picture processor, be suitable for obtaining the image data corresponding with the pictorial information in the described picture access request, according to determined compression ratio described image data is compressed processing, and via described network interface the image data of compressed processing is transferred to computing terminal; And
Picture memory is suitable for storing the corresponding image data of described pictorial information.
11. server as claimed in claim 10, wherein,
Described picture access request also comprises the network type information of described computing terminal,
Described type decision device also is suitable for obtaining the network type information of the described computing terminal that comprises in the described picture access request,
Described compression ratio determinant also is suitable for determining according to the network type information of described computing terminal the compression ratio of described picture.
12. such as claim 10 or 11 described servers, described computing terminal comprises one or more in the following terminal type: portable computing device, PDA, dull and stereotyped computing equipment, smart mobile phone portable terminal, laptop computer and desktop computer.
13. such as claim 10 or 11 described servers, the terminal type information of described computing terminal comprises: the screen size of computing terminal, and/or the length-width ratio of the screen of computing terminal.
14. server as claimed in claim 11, the network of wherein said computing terminal comprise in the following network type one or more: GPRS, CDMA, 3G, 4G and WIFI network.
15. such as any described server among the claim 10-14, described picture access request is based on http protocol, and the field that is used to indicate the terminal type information of computing terminal is included in user agent's part of http protocol.
16. such as the server of claim 15, the network type information of wherein said computing terminal is included in the described picture access request with parametric form.
17. such as any described server among the claim 11-16, described compression ratio determinant is further adapted for: set in advance and store the table of comparisons between the compression ratio of described terminal type information or network type information and picture, search the described table of comparisons, determine the compression ratio of the picture corresponding with described terminal type or network type.
18. such as any described server among the claim 10-17, described picture processor is further adapted for carries out color conversion, dct transform, quantification and coding to described image data, wherein, described quantification further comprises: the quality factor when determining to quantize according to described compression ratio; Quantize by the definite step-length that quantizes of described quality factor and according to described step-length.
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| PCT/CN2013/085975 WO2014063652A1 (en) | 2012-10-26 | 2013-10-25 | Method and server for providing image data to computing terminal |
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