CN101916426A - Image positioning method and device - Google Patents
Image positioning method and device Download PDFInfo
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- CN101916426A CN101916426A CN 201010232808 CN201010232808A CN101916426A CN 101916426 A CN101916426 A CN 101916426A CN 201010232808 CN201010232808 CN 201010232808 CN 201010232808 A CN201010232808 A CN 201010232808A CN 101916426 A CN101916426 A CN 101916426A
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Abstract
The invention discloses an image positioning method and an image positioning device. The image positioning method comprises the following steps of: acquiring the format type of an image file; analyzing hexadecimal codes of the image file word by word; if an extended information identifier corresponding to the format type of the image file is analyzed, further judging whether extended information corresponding to the extended information identifier includes image positioning information or not according to a customized data identifier which is positioned behind the extended information mark; and acquiring the image positioning information if the extended information includes the image positioning information, and positioning the image according to the image positioning information. By applying the technical scheme, the positioning information is directly written in the image file, and the positioning information of the image is directly acquired and the image is positioned in the image decoding process. The positioning information written in the image file is suitable for various display environments, so the respective writing of positioning control codes for different display environments is not required.
Description
Technical field
The present invention relates to the digital image processing techniques field, particularly relate to a kind of image position method and device.
Background technology
Development of Multimedia Technology, make the expression-form horn of plenty more of information, wherein, image (Images) is a kind of application medium more widely, particularly, make image become a kind of important information-bearing form in fields such as communication, computing machine along with development of digital image.
When needs during display image, need relate to the substance of two aspects in application program: to the decoding of image and to the location of image.The former effect is to parse corresponding view data from image file, and the latter's effect then is to determine that image shows the relative position of output in the page.
In the prior art, framing generally is to be controlled by application program self, that is: with the position control parameter of image, and the source code of write-in program such as for example wide, high, horizontal, ordinate, in the process that program is carried out, image is positioned control according to the controlled variable in the source code.The limitation of this localization method is, at the image display operations under the different display environments, need write corresponding positioning control codes respectively.For example,, need write different positioning control codes, to guarantee that image can both correctly show under various resolution at different screen display resolution.In addition, use this localization method, whenever carry out image display operations one time, all need to read and carry out corresponding positioning control codes, this has also caused influence to executing efficiency.
Summary of the invention
For solving the problems of the technologies described above, the embodiment of the invention provides a kind of image position method and device, and to avoid writing respectively at different display environments the problem of positioning control codes, technical scheme is as follows:
The embodiment of the invention provides a kind of image position method, comprising:
Obtain the Format Type of image file;
Hexadecimal code to image file is word for word resolved; If be resolved to the extend information sign corresponding, then with the Format Type of described image file
Further, judge whether identify pairing extend information with described extend information comprises framing information according to being positioned at described extend information sign self-defining data sign afterwards;
If then obtain described framing information, and image positioned according to described framing information.
Preferably, described method also comprises:
The framing information of being obtained is carried out buffer memory.
Wherein, when the Format Type of described image file is GIF;
The described extend information corresponding with the GIF Format Type is designated 21FF;
Described self-defining data sign is positioned at described extend information sign the 2nd byte to the 9 bytes afterwards.
The described framing information of obtaining comprises: read described extend information sign the 14th byte to the 21 bytes afterwards, obtain framing information.
When the Format Type of described image file is PNG;
The described extend information corresponding with the PNG Format Type is designated 74 45 58 74;
Described self-defining data sign is positioned at the 1st byte to the 10 bytes after the described extend information sign.
The described framing information of obtaining comprises: read described extend information sign the 27th byte to the 34 bytes afterwards, obtain framing information.
The embodiment of the invention also provides a kind of framing device, comprising:
The Format Type acquiring unit is used to obtain the Format Type of image file;
The code analysis unit is used for the hexadecimal code of image file is word for word resolved;
Judging unit, be used for when described code analysis unit resolves identifies to the extend information corresponding with the Format Type of described image file, further, judge whether identify pairing extend information with described extend information comprises framing information according to being positioned at described extend information sign self-defining data sign afterwards;
Positioning unit is used in the judged result of described judging unit obtaining described framing information, and according to described framing information image being positioned when being.
Preferably, said apparatus can also comprise:
Buffer unit is used for the framing information of being obtained is carried out buffer memory.
When the Format Type of described image file was GIF, the described extend information corresponding with the GIF Format Type was designated 21 FF; Described self-defining data sign is positioned at described extend information sign the 2nd byte to the 9 bytes afterwards;
Described positioning unit 404 by reading described extend information sign the 14th byte to the 21 bytes afterwards, obtains framing information.
When the Format Type of described image file was PNG, the described extend information corresponding with the PNG Format Type was designated 74 45 58 74; Described self-defining data sign is positioned at the 1st byte to the 10 bytes after the described extend information sign;
Described positioning unit 404 by reading described extend information sign the 27th byte to the 34 bytes afterwards, obtains framing information.
In the technical scheme that the embodiment of the invention provided, locating information is write direct in the image file, in to the decode procedure of image, directly obtain the locating information of image and finish location image.The locating information that writes image file is applicable to various display environments, therefore need not to write positioning control codes respectively at different display environments.In addition, can also carry out buffer memory, all read and carry out corresponding positioning control codes, improve executing efficiency thereby avoid whenever carrying out an image display operations to the framing information of having obtained.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, to do to introduce simply to the accompanying drawing of required use in embodiment or the description of the Prior Art below, apparently, the accompanying drawing that describes below only is some embodiment that put down in writing among the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the process flow diagram of embodiment of the invention image position method;
Fig. 2 is an embodiment of the invention GIF format-pattern extend information synoptic diagram;
Fig. 3 is an embodiment of the invention PNG format-pattern extend information synoptic diagram;
Fig. 4 is a kind of structural representation of embodiment of the invention framing device;
Fig. 5 is the another kind of structural representation of embodiment of the invention framing device.
Embodiment
At first a kind of image position method that the embodiment of the invention provided is described,, may further comprise the steps referring to shown in Figure 1:
S101 obtains the Format Type of image file;
S102 word for word resolves the hexadecimal code of image file; If be resolved to the extend information sign corresponding, then carry out S103 with the Format Type of described image file
S103 further according to being positioned at described extend information sign self-defining data sign afterwards, judges whether identify pairing extend information with described extend information comprises framing information;
S104 is if then obtain described framing information, and according to described framing information image is positioned.
In the technical scheme that the embodiment of the invention provided, locating information is write direct in the image file, in to the decode procedure of image, directly obtain the locating information of image and finish location image.In embodiments of the present invention, the locating information that writes image file in advance can guarantee to be applicable to various display environments, therefore need not to write positioning control codes respectively at different display environments.No matter under which kind of display environment, can guarantee the correct demonstration of image, thereby reduce the complexity of programming according to the entrained locating information of image file self.
In addition, because locating information goes for various display environments, therefore for the framing information of having obtained, can also further carry out caching process, when needs show this image once more, can directly from buffer memory, read locating information, all read and carry out corresponding positioning control codes, improve executing efficiency thereby avoid whenever carrying out an image display operations.
In order to make those skilled in the art person understand technical scheme among the present invention better, below in conjunction with the accompanying drawing in the embodiment of the invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, the every other embodiment that those of ordinary skills obtained should belong to the scope of protection of the invention.
The scheme of the embodiment of the invention, mainly be applicable to the application scenarios that some need show compact image, for example, carry out the stage of background process in program, need to show that a picture cues user waits for that the type of image can be static, for example show " please wait for " printed words etc., also can be dynamic, for example show a Dynamic Schedule bar or minor clock or the like.Use for this class, locating information can be write in the image file.
Below respectively at GIF and two kinds of picture formats commonly used of PNG, the concrete scheme of the embodiment of the invention is described:
Embodiment one:
GIF (Graphics Interchange Format, GIF(Graphic Interchange format)), it is a kind of image file format based on colors list, in a gif file, can deposit several coloured images, if read and be shown on the screen by the width of cloth being stored in the multiple image data in the file, just can constitute simple animation.
Gif file inside is divided into many storage blocks, is used for storing the controll block of multiple image or the behavior of decision image appearance, in order to realize animation and interactive application.
Application extension block (application extension) is arranged among the GIF, and this piece can be used for writing locating information, and the extension blocks related pattern of GIF formatted file is as follows:
Extension blocks sign (1 byte): being used to identify this is an extension blocks, and fixed value is 21;
Application extensions label (1 byte): being used to identify this is an application extensions piece, and fixed value is FF;
Block size (1 byte): fixed value 14 (be metric 20, the content of the 8+3+1+8 byte of corresponding back);
Self-defining data sign (8 byte) is used to write customized information, and to identify the effect of this extension blocks, in embodiments of the present invention, this partial information is used for being illustrated in extend information and whether comprises framing information;
Special identifier (3 byte): keeping the position, generally is 00 00 00;
Extend information length (1 byte): fixed value 08, the 8 byte expansion information contents of corresponding back;
Extend information content (8 byte): in embodiments of the present invention, can be used to write framing information;
End mark (1 byte): fixed value 00.
Wherein, above-mentioned numerical value is all with hexadecimal representation, and per two sexadecimal numbers are equivalent to a byte.Referring to shown in Figure 2, the left side is the sexadecimal viewing area of image file code, and the right side is and the corresponding text character of hexadecimal code district.
In the present embodiment, as self-defined user ID, then Dui Ying GIF format-pattern localization method flow process is as follows with text character " common " (corresponding sexadecimal is 63 6F 6D 6D6F 6E 00 00):
S201, the Format Type that obtains image file is GIF;
S202 word for word resolves the hexadecimal code of image file; When being resolved to 21 FF, further carry out S203;
S203 judges whether the 2nd byte to the 9 bytes are 63 6F 6D 6D 6F 6E 00 00 behind 21 FF, if then carry out S204:
S204 reads the data of the 14th byte to the 21 bytes behind 21 FF, i.e. extend information content is as framing information.The extend information content is 14 00 B5 01 32 00 32 00 in the present embodiment, the horizontal ordinate x=20 (0014h) of difference presentation video top left corner pixel in the page, ordinate y=437 (01B5h), figure image width w=50 (0032h), figure image height h=50 (0032h).Then, utilize x, the y, w, the h value that are parsed, just can position image.
Need to prove, use the present embodiment technical scheme, do not need to limit for the write sequence of the content of self-defined user ID and x, y, w, h.
Embodiment two:
PNG (Portable Network Graphics, the portable network picture), be a kind of lossless data compression bga, allow to use the palette technology that is similar to the GIF form, support the true color picture, and possess alpha channel characteristics such as (translucent).
PNG has tEXt text data piece, and this piece can be used for writing locating information, and the tEXt text data piece related pattern of PNG formatted file is as follows:
Data block length (4 byte): as shown in Figure 3 00 00 00 23;
Data block type (4 byte): as shown in Figure 3 74 45 58 74, corresponding text character represents that this piece is a tEXt text data piece for " tEXt ";
Self-defining data sign (10 byte) is used to write customized information, and to identify the effect of this extension blocks, in embodiments of the present invention, this partial information is used for being illustrated in extend information and whether comprises framing information;
Null character (NUL) (1 byte): fixed value 00;
Text data piece content (8 byte): in embodiments of the present invention, can be used to write framing information;
End mark (1 byte): fixed value 00.
In the present embodiment, as self-defined user ID, then Dui Ying PNG format-pattern localization method flow process is as follows with text character " iPanelData " (corresponding sexadecimal is 69 50 61 6E 656C 44 61 74 61):
S301, the Format Type that obtains image file is PNG;
S302 word for word resolves the hexadecimal code of image file; When being resolved to 74 45 58 74, further carry out S303;
S303 judges whether 74455874 back the 1st byte to the 10 bytes are 69 50 61 6E, 65 6,C44 61 74 61, if then carry out S304:
S304 reads the data of 74455874 back the 27th byte to the 34 bytes, i.e. extend information content is as framing information.The extend information content is 44 02 2C 01 78 00 78 00 in the present embodiment, the horizontal ordinate x=580 (0244h) of difference presentation video top left corner pixel in the page, ordinate y=300 (012Ch), figure image width w=120 (0078h), figure image height w=120 (0078h).Then, utilize x, the y, w, the h value that are parsed, just can position image.
Need to prove, use the present embodiment technical scheme, do not need to limit for the write sequence of the content of self-defined user ID and x, y, w, h.
Below illustrate that at the image position method of GIF and two kinds of forms commonly used of PNG corresponding to top method embodiment, the present invention also provides a kind of framing device, referring to shown in Figure 4, comprising respectively:
Format Type acquiring unit 401 is used to obtain the Format Type of image file;
Judging unit 403, when being used for being resolved to the corresponding extend information sign of Format Type with described image file in described code analysis unit 402, further, judge whether identify pairing extend information with described extend information comprises framing information according to being positioned at described extend information sign self-defining data sign afterwards;
Referring to shown in Figure 5, said apparatus can also comprise:
Buffer unit 405 is used for the framing information of being obtained is carried out buffer memory.
Wherein, when the Format Type of described image file was GIF, the described extend information corresponding with the GIF Format Type was designated 21 FF; Described self-defining data sign is positioned at described extend information sign the 2nd byte to the 9 bytes afterwards;
Described positioning unit 404 by reading described extend information sign the 14th byte to the 21 bytes afterwards, obtains framing information.
When the Format Type of described image file was PNG, the described extend information corresponding with the PNG Format Type was designated 74 45 58 74; Described self-defining data sign is positioned at the 1st byte to the 10 bytes after the described extend information sign;
Described positioning unit 404 by reading described extend information sign the 27th byte to the 34 bytes afterwards, obtains framing information.
For the convenience of describing, be divided into various unit with function when describing above the device and describe respectively.Certainly, when enforcement is of the present invention, can in same or a plurality of softwares and/or hardware, realize the function of each unit.
As seen through the above description of the embodiments, those skilled in the art can be well understood to the present invention and can realize by the mode that software adds essential general hardware platform.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product can be stored in the storage medium, as ROM/RAM, magnetic disc, CD etc., comprise that some instructions are with so that a computer equipment (can be a personal computer, server, the perhaps network equipment etc.) carry out the described method of some part of each embodiment of the present invention or embodiment.
Each embodiment in this instructions all adopts the mode of going forward one by one to describe, and identical similar part is mutually referring to getting final product between each embodiment, and each embodiment stresses all is difference with other embodiment.Especially, for device embodiment, because it is substantially similar in appearance to method embodiment, so describe fairly simplely, relevant part gets final product referring to the part explanation of method embodiment.Device embodiment described above only is schematic, wherein said unit as the separating component explanation can or can not be physically to separate also, the parts that show as the unit can be or can not be physical locations also, promptly can be positioned at a place, perhaps also can be distributed on a plurality of network element.Can select wherein some or all of module to realize the purpose of present embodiment scheme according to the actual needs.Those of ordinary skills promptly can understand and implement under the situation of not paying creative work.
The present invention can be used in numerous general or special purpose computingasystem environment or the configuration.For example: personal computer, server computer, handheld device or portable set, plate equipment, multicomputer system, the system based on microprocessor, set top box, programmable consumer-elcetronics devices, network PC, small-size computer, mainframe computer, comprise distributed computing environment of above any system or equipment or the like.
The present invention can describe in the general context of the computer executable instructions of being carried out by computing machine, for example program module.Usually, program module comprises the routine carrying out particular task or realize particular abstract, program, object, assembly, data structure or the like.Also can in distributed computing environment, put into practice the present invention, in these distributed computing environment, by by communication network connected teleprocessing equipment execute the task.In distributed computing environment, program module can be arranged in the local and remote computer-readable storage medium that comprises memory device.
The above only is the specific embodiment of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (10)
1. an image position method is characterized in that, comprising:
Obtain the Format Type of image file;
Hexadecimal code to image file is word for word resolved; If be resolved to the extend information sign corresponding, then with the Format Type of described image file
Further, judge whether identify pairing extend information with described extend information comprises framing information according to being positioned at described extend information sign self-defining data sign afterwards;
If then obtain described framing information, and image positioned according to described framing information.
2. method according to claim 1 is characterized in that, also comprises:
The framing information of being obtained is carried out buffer memory.
3. method according to claim 1 and 2 is characterized in that,
The Format Type of described image file is GIF;
The described extend information corresponding with the GIF Format Type is designated 21 FF;
Described self-defining data sign is positioned at described extend information sign the 2nd byte to the 9 bytes afterwards.
4. method according to claim 3 is characterized in that, the described framing information of obtaining comprises:
Read described extend information sign the 14th byte to the 21 bytes afterwards, obtain framing information.
5. method according to claim 1 and 2 is characterized in that,
The Format Type of described image file is PNG;
The described extend information corresponding with the PNG Format Type is designated 74 45 58 74;
Described self-defining data sign is positioned at the 1st byte to the 10 bytes after the described extend information sign.
6. method according to claim 3 is characterized in that, the described framing information of obtaining comprises:
Read described extend information sign the 27th byte to the 34 bytes afterwards, obtain framing information.
7. a framing device is characterized in that, comprising:
The Format Type acquiring unit is used to obtain the Format Type of image file;
The code analysis unit is used for the hexadecimal code of image file is word for word resolved;
Judging unit, be used for when described code analysis unit resolves identifies to the extend information corresponding with the Format Type of described image file, further, judge whether identify pairing extend information with described extend information comprises framing information according to being positioned at described extend information sign self-defining data sign afterwards;
Positioning unit is used in the judged result of described judging unit obtaining described framing information, and according to described framing information image being positioned when being.
8. device according to claim 7 is characterized in that, also comprises:
Buffer unit is used for the framing information of being obtained is carried out buffer memory.
9. according to claim 7 or 8 described devices, it is characterized in that,
The Format Type of described image file is GIF; The described extend information corresponding with the GIF Format Type is designated 21 FF; Described self-defining data sign is positioned at described extend information sign the 2nd byte to the 9 bytes afterwards;
Described positioning unit by reading described extend information sign the 14th byte to the 21 bytes afterwards, obtains framing information.
10. according to claim 7 or 8 described devices, it is characterized in that,
The Format Type of described image file is PNG; The described extend information corresponding with the PNG Format Type is designated 74 45 58 74; Described self-defining data sign is positioned at the 1st byte to the 10 bytes after the described extend information sign;
Described positioning unit by reading described extend information sign the 27th byte to the 34 bytes afterwards, obtains framing information.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102328084A CN101916426B (en) | 2010-07-16 | 2010-07-16 | Image positioning method and device |
| HK11104662.6A HK1150676A1 (en) | 2010-07-16 | 2011-05-12 | A method and device of image location |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN2010102328084A CN101916426B (en) | 2010-07-16 | 2010-07-16 | Image positioning method and device |
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| CN101916426A true CN101916426A (en) | 2010-12-15 |
| CN101916426B CN101916426B (en) | 2012-07-25 |
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| CN2010102328084A Active CN101916426B (en) | 2010-07-16 | 2010-07-16 | Image positioning method and device |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1230072A (en) * | 1998-01-13 | 1999-09-29 | 松下电器产业株式会社 | Image information processing device and image information processing method |
| US20030219071A1 (en) * | 2002-05-23 | 2003-11-27 | Realtek Semiconductor Corp. | Method and a device for processing digital image |
| US20060072783A1 (en) * | 2001-03-05 | 2006-04-06 | Rhoads Geoffrey B | Geographically watermarked imagery and methods |
| CN101609458A (en) * | 2009-07-08 | 2009-12-23 | 北京农业信息技术研究中心 | A kind of digital photo automatic space identification and indexing means |
-
2010
- 2010-07-16 CN CN2010102328084A patent/CN101916426B/en active Active
-
2011
- 2011-05-12 HK HK11104662.6A patent/HK1150676A1/en unknown
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1230072A (en) * | 1998-01-13 | 1999-09-29 | 松下电器产业株式会社 | Image information processing device and image information processing method |
| US20060072783A1 (en) * | 2001-03-05 | 2006-04-06 | Rhoads Geoffrey B | Geographically watermarked imagery and methods |
| US20030219071A1 (en) * | 2002-05-23 | 2003-11-27 | Realtek Semiconductor Corp. | Method and a device for processing digital image |
| CN101609458A (en) * | 2009-07-08 | 2009-12-23 | 北京农业信息技术研究中心 | A kind of digital photo automatic space identification and indexing means |
Non-Patent Citations (1)
| Title |
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| 《CSDN博客》 20100319 hiliton2008 给JPEG添加Exif图片说明信息的简单方法 全文 1-10 , 2 * |
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| Publication number | Publication date |
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| HK1150676A1 (en) | 2012-01-06 |
| CN101916426B (en) | 2012-07-25 |
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