CN102768755B - Obtain the method and apparatus of the thumbnail of picture - Google Patents
Obtain the method and apparatus of the thumbnail of picture Download PDFInfo
- Publication number
- CN102768755B CN102768755B CN201110116984.6A CN201110116984A CN102768755B CN 102768755 B CN102768755 B CN 102768755B CN 201110116984 A CN201110116984 A CN 201110116984A CN 102768755 B CN102768755 B CN 102768755B
- Authority
- CN
- China
- Prior art keywords
- picture
- source picture
- described source
- thumbnail
- gdi
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Editing Of Facsimile Originals (AREA)
Abstract
Embodiments provide a kind of method and apparatus obtaining the thumbnail of picture.The method mainly comprises: when source picture belongs to the picture format that GDI+ (Graphics Device Interface of enhancing) can decode, and when the resolution of source picture is less than the numerical value of setting, adopts GDI+ to decode to source picture; The resolution not belonging to picture format that described GDI+ can decode and/or described source picture when source picture is not less than the numerical value of setting, then judge whether described source picture is the JPG file being greater than setting figure place, if so, then GDI+ is utilized to carry out partial decoding of h to described source picture; Otherwise, adopt FreeImage to decode to described source picture.The embodiment of the present invention, by integrating the method for various available generation thumbnail, combines respective advantage, provides complete set solution.Effectively balance the picture format kind of support and compatible, various Consideration such as the generation speed of thumbnail, the thumbnail quality of generation etc.
Description
Technical field
The present invention relates to picture Processing Technique field, particularly relate to a kind of method and apparatus obtaining the thumbnail of picture.
Background technology
A kind of method obtaining the thumbnail of picture that the windows operating system of Microsoft provides mainly comprises: for the picture in current directory, operating system first reads the " Thumbs.db " file in current directory, should " Thumbs.db " file be a hidden file, represent a thumbnail data storehouse.When operating system does not read the " Thumbs.db " thumbnail of not above-mentioned picture in the thumbnail data storehouse representated by file or " Thumbs.db " file of reading in current directory, then operating system can attempt the EXIF (Exchangeableimagefileformat that obtains in above-mentioned picture, exchangeable image file) information, above-mentioned EXIF information spinner will comprise: the relevant information of the digital photograph inserted in the picture file of the multiple formats such as JPG, may comprise the thumbnail of picture in this relevant information.When not obtaining the thumbnail of picture in the EXIF information of operating system in picture, then operating system can utilize decoding algorithm to carry out complete decoding to picture, then decoded picture is generated to the thumbnail of above-mentioned picture by difference arithmetic.
Realizing in process of the present invention, inventor finds the method for the thumbnail of acquisition picture of the prior art, and at least there are the following problems: carry out complete decoding by decoding algorithm to picture, speed is slow, and the picture format that can support is insufficient, and can not be suitable for the high picture of resolution.
Summary of the invention
The embodiment provides a kind of method and apparatus obtaining the thumbnail of picture, to realize the thumbnail obtaining picture quickly and efficiently.
Obtain a method for the thumbnail of picture, comprising:
Adopt the Graphics Device Interface GDI+ strengthened to decode to source picture, obtain decoded source picture;
Convergent-divergent interpolation is carried out to described decoded source picture, obtains the thumbnail of described source picture.
Obtain a device for the thumbnail of picture, comprising:
Decoding process module, for adopting the Graphics Device Interface GDI+ of enhancing to decode to source picture, obtains decoded source picture;
Interpolation processing module, for carrying out convergent-divergent interpolation to described decoding process module decoded source picture, obtains the thumbnail of described source picture.
The technical scheme provided as can be seen from the embodiment of the invention described above, the embodiment of the present invention, by integrating the method for various available generation thumbnail, combines respective advantage, provides complete set solution.Effectively balance the picture format kind of support and compatible, various Consideration such as the generation speed of thumbnail, the thumbnail quality of generation etc.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme of the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
A kind of processing flow chart obtaining the method for the thumbnail of picture that Fig. 1 provides for the embodiment of the present invention one;
A kind of concrete structure figure obtaining the device of the thumbnail of picture that Fig. 2 provides for the embodiment of the present invention two.
Embodiment
For making the object of the embodiment of the present invention, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
For ease of the understanding to the embodiment of the present invention, be further explained explanation below in conjunction with accompanying drawing for several specific embodiment, and each embodiment does not form the restriction to the embodiment of the present invention.
Embodiment one
A kind for the treatment of scheme obtaining the method for the thumbnail of picture that the embodiment of the present invention provides as shown in Figure 1, comprises following treatment step:
Step 11, obtain the source picture needing to extract thumbnail.Above-mentioned thumbnail carries out the little picture after scale smaller for source picture in computing machine, is generally used for rapid loading or once browses several pictures.In common application scenarios, the Pixel Dimensions of thumbnail is usually at below 150*150.
Step 12, read the file header of above-mentioned source picture, from this file header, obtain the length and width information of above-mentioned source picture, and the length and width information of above-mentioned source picture is preserved.
Step 13, the EXIF information obtained in the picture of above-mentioned source, judge the thumbnail that whether there is above-mentioned source picture in this EXIF information, if so, then performs step 14; Otherwise, perform step 16.
Step 14, from the EXIF information the picture of above-mentioned source, extract the thumbnail of above-mentioned source picture, perform step 15.
Step 15, length and width information according to the source picture of above-mentioned preservation, calculate the Aspect Ratio of above-mentioned source picture, and calculate the Aspect Ratio of the thumbnail of above-mentioned source picture.Judge that whether the Aspect Ratio of the thumbnail of above-mentioned source picture is consistent with the Aspect Ratio of above-mentioned source picture, if so, then obtain the thumbnail of above-mentioned source picture, flow process terminates; Otherwise, perform step 16.
A kind of GDI (Graphics Device Interface that the windows operating system of step 16, Microsoft provides, GraphicsDeviceInterface) major function is the message exchange between responsible system and plotter program, processes the images outputting of all Windows programs.GDI+ (GDI of enhancing) is the succession for former version GDI in WindowsXP and expansion.
The most common image form of above-mentioned GDI+ enclosed inside, the picture formats such as such as BMP, JPEG, GIF, PNG, TIFF.When the resolution of picture is larger, the speed of above-mentioned GDI+ decoding picture is by slow, and the length and width size of usual picture is greater than 1200, then think that the resolution of above-mentioned picture is larger.
Judge the picture format whether above-mentioned source picture belongs to above-mentioned GDI+ and can decode, and resolution less (namely the length and width size of source picture is not more than 1200), if so, then perform step 17; Otherwise, perform step 18.
Step 17, the decoding functions provided by calling GDI+ carry out complete decoding to above-mentioned source picture, and carry out convergent-divergent interpolation to decoded source picture, obtain the thumbnail of above-mentioned source picture, above-mentioned convergent-divergent interpolation comprises the known interpolation method such as arest neighbors, bilinearity.
Flow process terminates.
Step 18, judge that whether above-mentioned source picture is the JPG file being greater than setting figure place, if so, then perform step 19; Otherwise, perform step 20.Above-mentioned setting figure place can be 24.
Step 19, determine that above-mentioned source picture is the picture that resolution is large, long limit is greater than 1200, otherwise adopts GDI+ to decode in above-mentioned steps 17 to above-mentioned source picture.So according to the characteristic of JPG picture, the decoding functions provided by calling GDI+ carries out 1/8th fast decodings to above-mentioned source picture, namely intercepts the length and wide 1/8th of above-mentioned source picture respectively, GDI+ is utilized to decode to the source picture after intercepting.
Convergent-divergent interpolation is carried out to decoded source picture, obtains the thumbnail of above-mentioned source picture.Such as, the resolution of source picture is 2400*1600, and the resolution of 1/8th decoding figure so obtained is exactly 300*200, because thumbnail is less than 150*150, so more above-mentioned 1/8th decoding figure are carried out convergent-divergent interpolation to generate thumbnail.Flow process terminates.
Step 20, FreeImage (development diagram valut) are a picture format encoding and decoding engine storehouses of increasing income, and FreeImage is a lot of very complete to picture format support.The decoding functions provided by calling FreeImage carries out complete decoding to above-mentioned source picture.
Perform step 21.
Step 21, carry out convergent-divergent interpolation to decoded source picture, obtain the thumbnail of above-mentioned source picture, flow process terminates.
Embodiment two
A kind of device obtaining the thumbnail of picture that the embodiment of the present invention also provides, its concrete structure as shown in Figure 2, comprises following module:
Decoding process module 21, for adopting the Graphics Device Interface GDI+ of enhancing to decode to source picture, obtains decoded source picture;
Interpolation processing module 22, for carrying out convergent-divergent interpolation to described decoding process module decoded source picture, obtains the thumbnail of described source picture.
Described device can also comprise:
EXIF message processing module 23, for reading the file header of described source picture, obtaining the length and width information of described source picture, calculating the Aspect Ratio of described source picture according to this length and width information from this file header; When comprising the thumbnail of described source picture in the EXIF information in the picture of described source, then from described EXIF information, extracting the thumbnail of described source picture, calculating the Aspect Ratio of the thumbnail of described source picture; Judge that whether the Aspect Ratio of the thumbnail of described source picture is consistent with the Aspect Ratio of described source picture, if so, then obtain the thumbnail of described source picture; Otherwise, adopt GDI+ to decode to described source picture.
Specifically, described decoding process module 21 can comprise:
First processing module 211, for belonging to the picture format that described GDI+ can decode when described source picture, and when the resolution of described source picture is less than the numerical value of setting, then the decoding functions that calling described GDI+ provides is decoded to described source picture.
Described decoding process module can also comprise:
Second processing module 212, the resolution not belonging to picture format that described GDI+ can decode and/or described source picture when described source picture is not less than the numerical value of setting, then judge whether described source picture is the JPG file being greater than setting figure place, if so, then the decoding functions that calling described GDI+ provides carries out partial decoding of h to described source picture; Otherwise the decoding functions that calling described development diagram valut FreeImage provides is decoded to described source picture.
One of ordinary skill in the art will appreciate that all or part of flow process realized in above-described embodiment method, that the hardware that can carry out instruction relevant by computer program has come, described program can be stored in a computer read/write memory medium, this program, when performing, can comprise the flow process of the embodiment as above-mentioned each side method.Wherein, described storage medium can be magnetic disc, CD, read-only store-memory body (Read-OnlyMemory, ROM) or random store-memory body (RandomAccessMemory, RAM) etc.
To sum up, the embodiment of the present invention is decoded to source picture by adopting GDI+, then, convergent-divergent interpolation is carried out to decoded source picture, obtain the thumbnail of described source picture, the thumbnail of picture can be obtained rapidly, and the picture format supported is also many.
For the picture with EXIF information, whether the embodiment of the present invention is consistent with the Aspect Ratio of above-mentioned source picture by the Aspect Ratio of the thumbnail judging picture, ensures the correctness of the thumbnail of the picture obtained from EXIF information.
For the picture of those not common format, the picture that resolution is large, the embodiment of the present invention carries out partial decoding of h by calling GDI+ to picture; Or, call FreeImage and picture decoded, ensure effectively to decode to picture.
The embodiment of the present invention is by integrating the method for various available generation thumbnail, combine respective advantage, provide complete set solution, effectively balance the picture format kind of support and compatible, various Consideration such as the generation speed of thumbnail, the thumbnail quality of generation etc.
The above; be only the present invention's preferably embodiment, but protection scope of the present invention is not limited thereto, is anyly familiar with those skilled in the art in the technical scope that the present invention discloses; the change that can expect easily or replacement, all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain of claim.
Claims (4)
1. obtain a method for the thumbnail of picture, it is characterized in that, comprising:
Decoding process step: when source picture belongs to the picture format that Graphics Device Interface GDI+ can decode, and when the resolution of described source picture is less than the numerical value of setting, the decoding functions that calling described GDI+ provides carries out complete decoding to described source picture, obtains decoded source picture;
When the resolution that described source picture does not belong to picture format that described GDI+ can decode and/or described source picture is not less than the numerical value of this setting, then judge whether described source picture is the JPG file being greater than setting figure place, if, GDI+ is then utilized to carry out partial decoding of h to described source picture, otherwise, then adopt development diagram valut FreeImage to decode to described source picture, obtain decoded source picture; And
Interpolation processing step: convergent-divergent interpolation is carried out to described decoded source picture, obtains the thumbnail of described source picture.
2. the method for the thumbnail of acquisition picture according to claim 1, is characterized in that, also comprises before described decoding process step:
Read the file header of described source picture, from this file header, obtain the length and width information of described source picture, calculate the Aspect Ratio of described source picture according to this length and width information;
When comprising the thumbnail of described source picture in the exchangeable image file EXIF information in the picture of described source, then from described EXIF information, extracting the thumbnail of described source picture, calculating the Aspect Ratio of the thumbnail of described source picture;
Judge that whether the Aspect Ratio of the thumbnail of described source picture is consistent with the Aspect Ratio of described source picture, if so, then obtain the thumbnail of described source picture; Otherwise, perform described decoding process step.
3. obtain a device for the thumbnail of picture, it is characterized in that, comprising:
First processing module, for belonging to the picture format that Graphics Device Interface GDI+ can decode when source picture, and when the resolution of described source picture is less than the numerical value of setting, the decoding functions that calling described GDI+ provides carries out complete decoding to described source picture, obtains decoded source picture;
Second processing module, when resolution for not belonging to picture format that described GDI+ can decode and/or described source picture when described source picture is not less than the numerical value of this setting, then judge whether described source picture is the JPG file being greater than setting figure place, if, GDI+ is then utilized to carry out partial decoding of h to described source picture, otherwise, then adopt development diagram valut FreeImage to decode to described source picture, obtain decoded source picture; And
Interpolation processing module, for carrying out convergent-divergent interpolation to described first processing module or the second processing module decoded source picture, obtains the thumbnail of described source picture.
4. the device of the thumbnail of acquisition picture according to claim 3, is characterized in that, described device also comprises:
Exchangeable image file EXIF message processing module, for reading the file header of described source picture, obtaining the length and width information of described source picture, calculating the Aspect Ratio of described source picture according to this length and width information from this file header; When comprising the thumbnail of described source picture in the EXIF information in the picture of described source, then from described EXIF information, extracting the thumbnail of described source picture, calculating the Aspect Ratio of the thumbnail of described source picture; Judge that whether the Aspect Ratio of the thumbnail of described source picture is consistent with the Aspect Ratio of described source picture, if so, then obtain the thumbnail of described source picture; Otherwise, perform described first processing module or the second processing module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110116984.6A CN102768755B (en) | 2011-05-06 | 2011-05-06 | Obtain the method and apparatus of the thumbnail of picture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110116984.6A CN102768755B (en) | 2011-05-06 | 2011-05-06 | Obtain the method and apparatus of the thumbnail of picture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102768755A CN102768755A (en) | 2012-11-07 |
| CN102768755B true CN102768755B (en) | 2016-04-06 |
Family
ID=47096148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110116984.6A Active CN102768755B (en) | 2011-05-06 | 2011-05-06 | Obtain the method and apparatus of the thumbnail of picture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102768755B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103886624B (en) * | 2012-12-24 | 2017-02-08 | 三星电子（中国）研发中心 | JPEG image thumbnail extracting method |
| CN104933184A (en) * | 2015-06-30 | 2015-09-23 | 上海玮舟微电子科技有限公司 | Picture output method and device |
| CN105447820B (en) * | 2015-12-22 | 2018-10-23 | 厦门美图移动科技有限公司 | A kind of image processing method, device and mobile terminal |
| CN111986282B (en) * | 2020-08-21 | 2024-06-07 | 上海二三四五网络科技有限公司 | Plug-in for opening HEIC format pictures, freeIMage and computer program thereof |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4719375A (en) * | 1986-05-09 | 1988-01-12 | The United States Of America As Represented By The United States Department Of Energy | High resolution digital delay timer |
| CN100515035C (en) * | 2001-09-10 | 2009-07-15 | 株式会社尼康 | Digital camera system, image storage apparatus, and digital camera |
| CN101472163A (en) * | 2007-12-25 | 2009-07-01 | 百度在线网络技术（北京）有限公司 | Method, apparatus and system for transmitting picture file |
-
2011
- 2011-05-06 CN CN201110116984.6A patent/CN102768755B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN102768755A (en) | 2012-11-07 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106030652B (en) | Method, system and composite display controller for providing output surface and computer medium | |
| CN102768755B (en) | Obtain the method and apparatus of the thumbnail of picture | |
| US8837770B2 (en) | Non-transitory computer readable storage medium, marker creating apparatus, and marker creating method | |
| CN110991310B (en) | Portrait detection method, device, electronic equipment and computer readable medium | |
| JP2007082217A (en) | Method and device for creating thumbnail of digital image | |
| CN106803959B (en) | Video image encoding method, video image decoding method, video image encoding apparatus, video image decoding apparatus, and readable storage medium | |
| CN105791952A (en) | Screen shooting method and device for streaming media video data, and electronic device | |
| JP2006050551A (en) | Image processing apparatus, image processing method, program and storage medium | |
| CN115022670B (en) | Video file storage method, video file restoration device, video file storage equipment and storage medium | |
| CN105681893A (en) | Method and device for decoding stream media video data | |
| JP2017211936A (en) | Document storage processing system | |
| CN110572713B (en) | Transcoding method and processing terminal for adaptive video bandwidth ratio | |
| CN102572207A (en) | Color space transformation method suitable for joint photographic experts group (JPEG) image | |
| CN102176205A (en) | File format for storage of chain code image sequence and decoding algorithm | |
| CN115225615B (en) | Illusion engine pixel streaming method and device | |
| JP2017192080A (en) | Image compression device, image decoding device, image compression method, and image compression program | |
| CN111246249A (en) | Image encoding method, encoding device, decoding method, decoding device and storage medium | |
| CN1231101A (en) | Image mapping device and method, and image generating device and method | |
| CN108876703B (en) | Data storage method | |
| CN104517259A (en) | Digital watermark insertion method and device in color text files | |
| CN112312043A (en) | Optimization method and device for deriving animation video | |
| EP2169616B1 (en) | Video scaling techniques | |
| CN111405200A (en) | Video shrinking device, method and system and electronic equipment thereof | |
| CN118101971B (en) | Decoding data rendering method and device, electronic equipment and storage medium | |
| CN112000400B (en) | Animation resource file generation method and device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20190812 Address after: 518057 Nanshan District science and technology zone, Guangdong, Zhejiang Province, science and technology in the Tencent Building on the 1st floor of the 35 layer Co-patentee after: Tencent cloud computing (Beijing) limited liability company Patentee after: Tencent Technology (Shenzhen) Co., Ltd. Address before: 2 East 403 room, SEG science and technology garden, Futian District, Guangdong, Shenzhen 518028, China Patentee before: Tencent Technology (Shenzhen) Co., Ltd. |