CN102244784B - Method for compressing and displaying picture including transparent information - Google Patents
Method for compressing and displaying picture including transparent information Download PDFInfo
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- CN102244784B CN102244784B CN201110153441.1A CN201110153441A CN102244784B CN 102244784 B CN102244784 B CN 102244784B CN 201110153441 A CN201110153441 A CN 201110153441A CN 102244784 B CN102244784 B CN 102244784B
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Abstract
The invention relates to a method for compressing and displaying a picture including transparent information, which can be used for well solving the problems of larger occupation space and slower drawing speed in the prior art, wherein a special decoding library and a special drawing library are established on terminal equipment firstly; then, an original picture of the picture including transparent information is compressed, stored and displayed on the terminal equipment by the following steps of: step 1, reading the original picture and decoding the original picture by the terminal equipment; step 2, newly establishing a corresponding target picture; step 3, reading alpha channel values to form an alpha channel value list; step 4, storing colour data; step 5, inputting auxiliary information of the original picture in the target picture; step 6, storing; and step 7, transferring the special decoding library and the special drawing library to display the target picture. By means of the invention, the picture including transparent information can be converted into a picture having small storage occupation space and rapid drawing speed so as to be compressed, stored and displayed.
Description
Technical field
The present invention relates to a kind of method containing transparent information picture compression and demonstration, particularly a kind of transparent information picture that contains large by taking up room, that render speed is slower is converted to less, the render speed method that picture compresses, stores, shows on various terminal equipments faster that takes up room that stores.
Background technology
At present, in various terminal equipments, the application of handheld terminal is rather extensive, in a lot of fields, there is application, such as PDA, mobile phone is all now widely used handheld terminal, but general handheld terminal has a larger problem, in order to keep portable, so equipment calculated performance of handheld terminal, memory space, transmission speed is often not as main equipments such as computers, so often comparatively waste time and energy when processing more data, aspect picture processing, this type of situation especially easily appears at while processing the large-scale image data that contains transparent information, because the picture containing transparent information must have alpha channel value, take PNG format picture as example, in PNG format picture, the data block of storage pixel point actual information is video data block IDAT (image data chunk): it stores actual data, in data flow, can comprise the video data block of a plurality of consecutive orders, wherein be used for representing that the data block of each pixel forms by two parts, a part is the RGB565 data of 24, another part is for representing 8 alpha channel value of picture transparence information degree, obviously visible, the PNG picture format that contains transparence information degree is than the picture format containing transparent information is not much bigger, so there will be data processing slow when processing PNG format picture, stand-by period that Shows Picture is long, simultaneously PNG format picture to take memory space large, even there will be mass data to process simultaneously and cause the situation of function deficiency to produce.Therefore, invent a kind of large by taking up room, render speed is slower containing transparent information picture, is converted to and stores less, the render speed of taking up room picture is necessary in various terminal equipments, particularly compression on handheld terminal, the method that stores, show faster.
Chinese patent notification number CN 1361630A, July 31 2002 day for announcing, a kind of cartoon compressing method for wireless network and radio hand-held equipment is disclosed, comprise the following steps successively: (1) take Flash file as data source, therefrom extract primitive frame, and preserve these primitive frames with the form of colored BMP image file; (2) the colored BMP picture inversion generating in step 1 is become to the BMP image of 256 gray scales; (3), according to the ratio difference of the picture element of each gray scale in frame, from convert the primitive frame of BMP image of 256 gray scales to, extract key frame; (4) key frame is carried out to difference processing and obtain difference image, and save as BMP difference image file with the naming method of appointment; (5) by generating BMP difference image file in step 4, convert PNG image file to; This PNG file is called 1_f_x_y.PNG, and wherein PNG represents file type, and f, by 1 beginning, represents that this file is to belong to which frame, and x, y represent respectively the coordinate in the upper left corner of this difference pictures in this frame; (6) PNG image file sequence has been carried out again assembled, generated a large PNG image file and relevant image data list thereof; Again this large PNG image file, data list and animation player are packed in the lump.This technical scheme discloses a kind of method of picture compression of animation form, but in this technical scheme, the picture of the PNG form of employing still has larger compression stroke, still can further do and compress, and can also improve the speed of drafting simultaneously.
Summary of the invention
The object of the invention is to solve in above-mentioned prior art while drawing containing the decoding of transparent information picture, there will be data processing slowly, the stand-by period that Shows Picture is long, simultaneously containing the problem that memory space is large that takies of transparent information picture, provide a kind of large by taking up room, render speed is slower containing transparent information picture, is converted to less, the render speed method that picture compresses, stores, shows on various terminal equipments faster that takes up room that stores.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method containing transparent information picture compression and demonstration, by by after original image decoding again compressed shape become small volume, the fast Target Photo of render speed to store, then Target Photo is decoded to draw and show, first on terminal equipment, set up the special-purpose storehouse of decoding, the special-purpose storehouse of drawing, then by following steps, the original image containing transparent information picture compressed and stores demonstration on handheld terminal:
Step 1, described terminal equipment reads original image, determines the picture format of original image, and terminal equipment is decoded original image according to the picture format of original image;
Step 2, terminal equipment is according to the Target Photo that reads the newly-built correspondence of image size of original image;
Step 3, terminal equipment calls original image decoding storehouse the alpha channel value of all pixels of original image is read, and then the alpha channel value of all pixels of original image is inputted in order to form alpha channel value table after Target Photo and store;
Step 4, terminal equipment is inputted in order Target Photo by the color data of all pixels of original image and is stored;
Step 5, terminal equipment reads the supplementary of original image, and the supplementary input Target Photo of original image is stored;
Step 6, terminal equipment is deleted original image, and terminal equipment is preserved Target Photo according to special use decoding storehouse;
Step 7, terminal equipment calls special-purpose decoding storehouse, decode Target Photo, draw, terminal equipment display-object picture in the special-purpose storehouse of drawing.
Arrange like this, by input Target Photo after the alpha channel value of original image is extracted, Target Photo is by file header data block, palette data piece, video data block and image end data piece form, wherein storing actual data is that video data block consists of two parts, first be alpha channel value table, then be the RGB565 data of each pixel, pixel interdependence due to alpha channel value, so there is higher compression ratio when compression, by preserve the file size that can effectively reduce Target Photo using alpha channel value as alpha channel value table, in processing alpha channel value, also can process general image simultaneously, solved single pixel has been carried out to the slower problem of transparent value processing speed.
As preferably, in the step 3 of the described method containing transparent information picture compression and demonstration, in alpha channel value table, add up alpha channel value and be 0 and 255 data and carry out Run-Length Coding compression algorithm, then will after alpha channel value table input Target Photo, store.Arrange like this, because in most picture, modal in alpha channel value is 0 and 255, completely transparent and completely opaque, even in a lot of images, may occur that full figure is opaque, so alpha channel value is fixed numbers, in compression, there is very high compression ratio, it is because Run-Length Coding is a kind of statistical coding that applicable Run-Length Coding is done compression, this coding belongs to lossless compression-encoding, it is the important coding method of raster data compression, particularly effective for two-value calculating compression, the basic principle of run-length encoding is: with a value of symbol or the long continuous symbol that replaces having identical value of string, make symbol lengths be less than the length of initial data, only when the code of each row or each column data changes, once record the number that this code and same code repeat, thereby realize the compression of data, take PNG format picture as example, in PNG format picture, having 25% video data block is alpha channel value, and alpha channel value has a large amount of numerical value, be 255 and 0, what PNG image adopted is that LZ77 algorithm compresses video data block, thereby LZ77 algorithm is realized compression function by using the corresponding matched data information having occurred in encoder or decoder to replace current data, in its compression process, each alpha channel value in video data block is needed to the corresponding matched data information of going coupling to occur with adjacent color data, even so in compression process alpha channel value to have a large amount of numerical value be 255 and 0, the compression ratio of picture is also still limited, and the alpha channel value extracting is adopted to Run-Length Coding algorithm, a large amount of adjacent numerical value is that 255 and 0 alpha channel value only need once record the number that this code and same code repeat, thereby realize the compression of data, its compression ratio is far longer than the compression ratio that adopts LZ77, after compression, alpha channel value table takes up space and greatly reduces, after tested, adopt method compression ratio of the present invention can improve 10% to 30% left and right.
As preferably, in the step 4 of the described method containing transparent information picture compression and demonstration, the color data of all pixels is stored after carrying out inputting Target Photo after the compression of zip algorithm.The color data of pixel is carried out inputting after the compression of zip algorithm and is carried out stored energy after Target Photo and enough further reduce.
As preferably, in the step 7 of the described method containing transparent information picture compression and demonstration, terminal equipment is decoded the alpha channel value table that first reads Target Photo, completes the calculating of the alpha channel value of all pixels, and then carries out the color data calculating of all pixels.When terminal equipment need to show SLG file, carry out special-purpose decoding storehouse, flow process is identical with the drafting of PNG file, after decode image data piece, the different colours of root pixel is drawn, and difference is to draw alpha channel value, if test the alpha value of some points, is 0, and what know neighbor is total a of 0 value one, when drawing so this pixel, directly skip, do not draw; If testing the alpha value of some points is 255, and know that adjacent pixel is total b of 255 value one, when drawing so b pixel, the direct internal memory from decoding b pixel of SLG file copy out; If testing the alpha value of some points is not 0, be not 255 yet, so with regard to the pixel of vision-mix and the pixel of screen, mixed number size wherein, the alpha value reading exactly, the render speed of Target Photo has been accelerated in setting greatly like this, after tested, adopt method of the present invention, on terminal equipment, can promote 20% to 40% picture render speed.
As preferably, in the step 5 of the described method containing transparent information picture compression and demonstration, terminal equipment replaces with the supplementary of original image to input Target Photo after blank information and store.Although picture supplementary is the non-essential optional data blocks such as physical picture element sized data piece, primary colours and white point data block to be replaced with blank information storage by supplementary and has lost partial information, but also improved accordingly compression ratio, can be used as optional step, while needing higher graphical quality, can keep this partial information, if while needing higher compression ratio, higher drafting display speed, this partial information can be deleted.
The invention has the beneficial effects as follows: the present invention can be large by taking up room, render speed is slower containing transparent information picture be converted to store take up room less, render speed faster picture on terminal equipment, compress, store and show.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described in further detail.
Embodiment 1:
A kind of method containing transparent information picture compression and demonstration, the original image of take is example as PNG file, terminal equipment as handheld terminal, and described handheld terminal can be specially mobile phone, PDA, handheld device etc. to be had and calculate and the terminal equipment of graphical display function, first, in handheld terminal, Target Photo is set as to professional format, be set as in the present embodiment SLG file, complete SLG file should consist of following part: SLG file header data block, palette data piece, alpha channel value table, video data block, ending message code and check code and optional side information block, in handheld terminal, set up special-purpose decoding storehouse, the special-purpose storehouse of drawing, special-purpose decoding storehouse, the special-purpose storehouse of drawing builds according to the formation of SLG file, handheld terminal initialization starts, call the built-in PNG decoding of handheld terminal storehouse, handheld terminal reads the file header of original image, and original image is judged, if original image is not PNG file, this flow process finishes, if original image is PNG file, handheld terminal reads PNG file data blocks, handheld terminal is resolved by the PNG storehouse of decoding, read the image size of PNG file and the capacity of PNG file data, handheld terminal is according to the capacity of the size of original image and PNG file data, and content creating is the SLG file that blank Target Photo sets up content blank, and the SLG file of its empty contains alpha channel value table, now, handheld terminal decompresses the video data block in PNG file after compression, the view data that the view data now obtaining is each pixel, the view data of each pixel consists of 48 bit data, first three 8 bit data is the RGB565 data of display pixel point color data, the 4th 8 bit data are alpha channel value, handheld terminal is sent the alpha channel value of original image into alpha channel value table after extracting alpha channel value according to the form of PNG file, now handheld terminal is according to the special use storehouse of decoding, the adjacent transparent pixels of statistics a line is the number of pixels of 0 value, the adjacent transparent pixels of statistics a line is the number of pixels of 255 values.To transparent pixels, be 0 value separately, transparent pixels is 255 pixel, carry out Run-Length Coding, described Run-Length Coding is with a value of symbol or the long continuous symbol that replaces having identical value of string, make symbol lengths be less than the length of initial data, only when the code of each row or each column data changes, once record the number that this code and same code repeat, thereby realize the compression of data, if the alpha value of certain a line pixel in PNG file is 0, 0, 0, 0, 0, 13, 255, 254, 255, 255, 255, 255, 255, 255, 0, 128, 0, after Run-Length Coding, be 0-5, 13, 255, 254, 255-6, 0, 128, 0, obviously visible this journey alpha value data volume after Run-Length Coding reduces, so alpha channel value table completes the Lossless Compression of data, then first three 8 bit data of view data of each pixel of handheld terminal extraction PNG file carry out delivering to SLG file after ZIP compression, complete the Lossless Compression of video data block, then handheld terminal reads the supplementary of PNG file, picture supplementary is physical picture element sized data piece, primary colours and white point data block, these data blocks are non-essential optional data block, handheld terminal inputs to SLG file by the supplementary of PNG file, if in order to improve compression ratio, also can select the supplementary of PNG file to delete, after supplementary has been inputted, handheld terminal comprises that by other data of PNG file toning data piece inputs to SLG file, and SLG file adds ending message code and check code, and SLG file has built, and so far completes the compression containing transparent information picture, after SLG file has built, handheld terminal stores SLG file and is that PNG file is deleted by original image, so far completes the storage containing transparent information picture, when handheld terminal needs display-object picture, handheld terminal is carried out special-purpose decoding storehouse, the special-purpose storehouse of drawing to the SLG file of corresponding original image, the flow process of drafting SLG file and the drafting of PNG file are roughly the same, after decode image data piece, the different colours of root pixel is drawn, when difference is to draw alpha channel value, if testing the alpha value of some points is 0, and what know neighbor is total a of 0 value one, when drawing so this pixel, directly skip, do not draw, if testing the Alpha value of some points is 255, and know that adjacent pixel is total b of 255 value one, when drawing so b pixel, the direct internal memory from decoding b pixel of SLG file copy out, if testing the alpha value of some points is not 0, be not 255 yet, so with regard to the pixel of vision-mix and the pixel of screen, mixed number size wherein, the alpha value reading exactly, the render speed of Target Photo has been accelerated in setting greatly like this, after tested, adopt method of the present invention, on handheld terminal, can promote 20% to 40% picture render speed, so far complete the demonstration containing transparent information picture.
Embodiment 2:
Containing a method for transparent information picture compression and demonstration, take original image as tiff file be example; Handheld terminal need to be set up special-purpose decoding storehouse and the special-purpose storehouse of drawing equally, the method that basic process and PNG format picture compress storage demonstration on handheld terminal is similar, difference is, handheld terminal is when reading tiff file, handheld terminal need to call TIFF decoding storehouse, and according to the setting in TIFF decoding storehouse, read alpha channel value and do Run-Length Coding, set up alpha channel value table.
Above-described embodiment is a kind of preferably scheme of the present invention, not the present invention is done to any pro forma restriction, also has other variant and remodeling under the prerequisite that does not exceed the technical scheme that claim records.
Claims (4)
1. the method containing transparent information picture compression and demonstration, by by after original image decoding again compressed shape become small volume, the fast Target Photo of render speed to store, then Target Photo is decoded to draw and show, it is characterized in that: first on terminal equipment, set up the special-purpose storehouse of decoding, the special-purpose storehouse of drawing, then by following steps, the original image containing transparent information picture is compressed and stores demonstration on handheld terminal:
Step 1, described terminal equipment reads original image, determines the picture format of original image, and terminal equipment is decoded original image according to the picture format of original image;
Step 2, terminal equipment is according to the Target Photo that reads the newly-built correspondence of image size of original image;
Step 3, terminal equipment calls original image decoding storehouse the alpha channel value of all pixels of original image is read, and then the alpha channel value of all pixels of original image is inputted in order to form alpha channel value table after Target Photo and store; In alpha channel value table, add up alpha channel value and be 0 and 255 data and carry out Run-Length Coding compression algorithm, then will after alpha channel value table input Target Photo, store;
Step 4, terminal equipment is inputted in order Target Photo by the color data of all pixels of original image and is stored;
Step 5, terminal equipment reads the supplementary of original image, and the supplementary input Target Photo of original image is stored;
Step 6, terminal equipment is deleted original image, and terminal equipment is preserved Target Photo according to special use decoding storehouse;
Step 7, terminal equipment calls special-purpose decoding storehouse, decode Target Photo, draw in the special-purpose storehouse of drawing, if test the alpha value of some points, is 0, and what know neighbor is total a of 0 value one, when drawing so this pixel, directly skip, do not draw; If testing the Alpha value of some points is 255, and know that adjacent pixel is total b of 255 value one, when drawing so b pixel, the direct internal memory from decoding b pixel of SLG file copy out; If testing the alpha value of some points is not 0, is not 255 yet, so with regard to the pixel of vision-mix and the pixel of screen, mixed number size wherein, the alpha value reading exactly, terminal equipment display-object picture.
2. the method containing transparent information picture compression and demonstration according to claim 1, is characterized in that: in described step 4, the color data of all pixels is stored after carrying out inputting Target Photo after the compression of zip algorithm.
3. the method containing transparent information picture compression and demonstration according to claim 1 and 2, it is characterized in that: in described step 7, terminal equipment is decoded the alpha channel value table that first reads Target Photo, complete the calculating of the alpha channel value of all pixels, and then carry out the color data calculating of all pixels.
4. the method containing transparent information picture compression and demonstration according to claim 1 and 2, is characterized in that: in described step 5, terminal equipment replaces with the supplementary of original image to input Target Photo after blank information and store.
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Families Citing this family (11)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103826028B (en) | 2012-11-19 | 2017-08-25 | 腾讯科技（深圳）有限公司 | A kind of method and apparatus of Lossless Compression picture |
| CN104239221B (en) * | 2013-06-20 | 2017-07-25 | 赛恩倍吉科技顾问（深圳）有限公司 | reader memory optimizing system and method |
| CN103514616B (en) * | 2013-09-02 | 2017-01-11 | 北京新学堂网络科技有限公司 | Method for reducing size of mobile electronic magazine file |
| CN106993144B (en) * | 2017-03-22 | 2020-02-04 | 青岛海信电器股份有限公司 | Method and device for coding and decoding alpha channel data in OSD |
| CN109348226B (en) * | 2017-04-08 | 2022-11-11 | 腾讯科技（深圳）有限公司 | Picture file processing method and intelligent terminal |
| CN109089162B (en) * | 2017-04-08 | 2021-05-28 | 腾讯科技（深圳）有限公司 | Picture file processing method and system |
| CN107105266A (en) * | 2017-05-22 | 2017-08-29 | 郑州云海信息技术有限公司 | A kind of coding/decoding method, the apparatus and system of PNG images |
| CN108447550A (en) * | 2018-03-27 | 2018-08-24 | 宁波江丰生物信息技术有限公司 | A kind of file format of image storage |
| CN109657211A (en) * | 2018-12-11 | 2019-04-19 | 万兴科技股份有限公司 | The method, apparatus and intelligent terminal of line format conversion |
| CN110619667B (en) * | 2019-09-27 | 2023-03-21 | 恒信东方文化股份有限公司 | PNG picture compression method and system |
| CN113538208A (en) * | 2020-04-20 | 2021-10-22 | 华为技术有限公司 | Picture loading method and related device |
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| CN1361630A (en) * | 2002-01-25 | 2002-07-31 | 安凯（广州）软件技术有限公司 | Cartoon compressing method for radio network and hand-held radio equipment |
| CN101742317A (en) * | 2009-12-31 | 2010-06-16 | 北京中科大洋科技发展股份有限公司 | Video compressing and encoding method with alpha transparent channel |
| CN102036059A (en) * | 2009-09-25 | 2011-04-27 | 腾讯科技（深圳）有限公司 | Method, device and system for compressing and decompressing transparent images |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US6954215B2 (en) * | 2002-06-28 | 2005-10-11 | Microsoft Corporation | System and method for employing non-alpha channel image data in an alpha-channel-aware environment |
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|---|---|---|---|---|
| CN1361630A (en) * | 2002-01-25 | 2002-07-31 | 安凯（广州）软件技术有限公司 | Cartoon compressing method for radio network and hand-held radio equipment |
| CN102036059A (en) * | 2009-09-25 | 2011-04-27 | 腾讯科技（深圳）有限公司 | Method, device and system for compressing and decompressing transparent images |
| CN101742317A (en) * | 2009-12-31 | 2010-06-16 | 北京中科大洋科技发展股份有限公司 | Video compressing and encoding method with alpha transparent channel |
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