CN102821279A - Picture compression method keeping with alpha channel - Google Patents
Picture compression method keeping with alpha channel Download PDFInfo
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Abstract
The invention relates to a picture compression method keeping with an alpha channel. The picture compression method comprises the following steps: 1) reading picture data, scanning picture data pixel by pixel, and separating alpha channel data of each pixel; 2) combining alpha channel data of all pixels to be an alpha channel file; 3) carrying out a lossy compression on RGB (red green blue) channel data of all pixels to generate a RGB compressed file; and 4) combining the alpha channel file with the RGB compressed file in an intermediate file, and carrying out lossless compression on the intermediate file to generate compressed data. After the compression for twice, completed alpha channel file through the lossless compression and the RGB compressed file with lower compression rate through the lossy compression are kept in the compressed data, so that the alpha channel data of the picture file with ARGB (alpha red green blue) channel data can be kept, the compression rate of the picture file can be increased, and furthermore, the compression method can be used for encrypting the picture file.
Description
Technical field
The present invention relates to a kind of image processing field, be specifically related to a kind of picture compression method of the alpha of reservation passage.
Background technology
The alpha passage is one 8 a gray scale passage, and this passage comes the transparence information in the document image with 0-255 level gray scale, defines transparent, opaque and translucent area, and wherein black expression full impregnated is bright, representes opaquely in vain, and the ash expression is translucent.The scene of web game often utilizes the transparent characteristic of alpha passage to produce abundant effects in making, and with synthetic, can make in the picture certain part transparent according to different principle through the stack of alpha passage.Be about to selected color and from picture, remove, thereby make the picture of removing color partly appear background, the part of not removing color still keeps original color.
As shown in Figure 1, picture file is made up of the pixel that has the ARGB channel data, and each pixel all is ARGB (alpha, a red; Green, blue) look is divided into the alpha passage, the red passage; The green passage, the blue passage, wherein the alpha passage is a transparent channel.Pixel value comprises 32 bits, and span can be divided into alpha channel data, red channel data, green channel data, blue channel data from 0x00000000 to 0xFFFFFFFF.Wherein each channel data is 8 bits, and span is 0-255.Because it is more much bigger than common RGB picture file to have the ARGB picture file of alpha channel data; Therefore under those situation that picture quality and quantity are all had relatively high expectations, the compression ratio that improves picture file is for the storage of picture file and transmit and all have very great practical significance.
Be generally for the picture file compression method that contains the alpha passage in the prior art: one, picture file is carried out lossless compress and obtain compressed file, the initial data of the reducible alpha of comprising channel data after decompression and do not cause any distortion; But because the compression ratio of lossless compress is merely about 60% usually, make that the size of compressed file is still very big, can not satisfy the big picture file storage and the requirement of transmission.Two, picture file is carried out lossy compression method; Though the compression ratio of lossy compression method can reach about 14%; But existing lossy compression method method will be sacrificed the alpha channel data usually; The decompressing files that obtains after the decompression can't be realized the certain effects of original image with respect to the serious distortion of original picture file.Therefore, also do not have at present a kind ofly can both keep the alpha channel data, can carry out the picture compression method of lossy compression method again picture.
In order to protect the intellectual property of original Design Works, the author hopes Design Works is carried out encryption, is utilized by others in the process that on network, circulates with the Design Works of guaranteeing oneself and revises.And because the file format of picture is all fixed, if the author uses common compressed software that works are compressed and encrypts, will certainly be cracked easily by some analyzers that is directed to compressed software, the author is caused irretrievable loss.
Summary of the invention
The present invention is directed to the deficiency of prior art; Proposed a kind of in when compression both alpha channel data of the picture file of leave strip ARGB channel data; Can increase the compression ratio of picture file again, the picture compression method of the reservation alpha channel data that can also encrypt picture file.
Technical scheme of the present invention is following:
A kind of picture compression method, its step comprises:
1) reads image data, said image data is pursued the scanning of pixel, the alpha channel data of each pixel is separated;
2) the alpha channel data of all pixels is merged into alpha passage file;
3) the RGB channel data of all pixels carries out lossy compression method, generates the RGB compressed file;
4) said alpha passage file and said RGB compressed file merge in the intermediate file; Said intermediate file is carried out lossless compress, generate packed data.
Alpha channel data in the said step 1) separates through bit manipulation.
Intermediate file in the said step 4) is a binary file.
Said intermediate file comprises: picture width, sum of all pixels, alpha passage file, RGB compressed file.
The decompression step of said packed data comprises:
A) said packed data is decompressed obtain said intermediate file;
B) in said intermediate file, read said picture width and said sum of all pixels, picture height=sum of all pixels/picture width;
C) in memory, create a blank picture according to said picture height and said picture width;
D) read said alpha passage file and said RGB compressed file, said RGB compressed file is decompressed, generate RGB passage file;
E) the RGB channel data in alpha channel data in the said alpha passage file and the said RGB passage file is merged into pixel value, said pixel value is inserted in the said blank picture, be reduced into said image data.
Said lossy compression method method adopts Huffman encoding.
Said lossless compression method adopts the deflate algorithm.
Compression step carries out in server, generates said packed data, and said packed data is imported in the client through network; Said decompression step is carried out in said client, obtains image data after said packed data is decompressed.
Said image data generates user's interface displayed in client.
Technique effect of the present invention is following:
A kind of picture compression method that keeps the alpha passage of the present invention, its step comprises: 1) read image data, image data is pursued the scanning of pixel, the alpha channel data of each pixel is separated; 2) the alpha channel data of all pixels is merged into alpha passage file; 3) the RGB channel data of all pixels carries out lossy compression method, generates the RGB compressed file; 4) alpha passage file and RGB compressed file merge in the intermediate file; Intermediate file is carried out lossless compress, generate packed data.Through after above-mentioned twice compression, preserved in the packed data through lossless compress, complete alpha passage file with through lossy compression method, RGB compressed file that compression ratio is lower.Thereby both alpha channel datas of the picture file of leave strip ARGB channel data can increase the compression ratio of picture file again, and in addition, this compression method can also be used for picture file is encrypted.
Owing to after the compression alpha channel data and RGB compressed file are being merged in the intermediate file for the first time,, also can avoid two files in loading, to put upside down the risk that the loading that causes is failed because of sequencing except the complexity of the exploitation of can simplifying procedures.Further, if alpha channel data and RGB compressed file are divided into two files preservations, these two unique files can comprise file header information separately so, increase file size.And be tape file header not when alpha channel data and RGB compressed file deposited into a binary file, storage be exactly Pixel Information, and the volume of a file and compression ratio are higher.
Because binary file do not have file header, therefore with intermediate file with binary format, make packed data capacity littler through generating after the lossless compress.
Description of drawings
Fig. 1 is the picture file structural representation that has the ARGB passage
Fig. 2 is the schematic flow sheet that picture file is carried out second-compressed of the present invention
Embodiment
The present invention will be described below in conjunction with accompanying drawing.
In the following description, describing some details is that the technical staff of computer realm provides and wholely understands of the present invention.In an embodiment, show the element of realizing concrete function with the form of sketch map or block diagram, so that outstanding technological emphasis, and can aspect unnecessary details, not blur the present invention.Such as; Owing to contained about details disclosed in this areas such as network service, electromagnetic signal instruction technique, user interface or I/O technology, common-sense in those of ordinary skills' the understanding scope; Thereby omitted above-mentioned ins and outs in an embodiment to the full extent, and do not think that these details are to obtain the necessary characteristic of complete skill scheme of the present invention.
With the process to the compression and decompression of picture file in the web game is example; The system of a common web game comprises game server 1 and client 2; The compression process of picture file is carried out in game server 1; The compression back generates compressed file, and compressed file is imported in the client 2 through network; The process that decompresses is carried out in client 2, obtains decompressing files after compressed file is decompressed; Client 2 uses decompressing files to generate interface, and the user is shown.
As shown in Figure 2, the present invention splits picture file in game server 1, the alpha channel data is separated from the ARGB channel data, and the RGB channel data of remainder is carried out lossy compression method, generates the RGB compressed file.Afterwards alpha channel data and RGB compressed file are merged in the intermediate file, again this intermediate file is carried out lossless compress, generate final compressed file.Its concrete steps are following:
1) at first from the game database of game server 1, reads resource data, only keep picture file then, filter out alternative document, like configuration informations such as role's scenario A I in the recreation;
2) image data is carried out the scanning of individual element, through bit manipulation the alpha channel data of each pixel is separated from the ARGB channel data, the alpha channel data of all pixels is merged into alpha passage file;
The RGB channel data that 3) will be left all pixels is merged into RGB passage file, and adopts Huffman encoding that this RGB passage file is carried out lossy compression method, generates the RGB compressed file, and the picture quality of RGB compressed file can be adjusted according to demand;
4) with step 2) in RGB compressed file in isolated alpha passage file and the step 3) merge in the intermediate file with binary form; The content of this intermediate file comprises: the picture width is 4 bytes; Sum of all pixels is 4 bytes; Alpha passage file, the RGB compressed file;
5) intermediate file after will merging adopts the deflate algorithm to carry out lossless compress once more, generates the compressed file of picture file.
Be matched with the second-compressed in the game server 1, the present invention decompresses to compressed file in client 2:
A) use the decompression of deflate algorithm to obtain the intermediate file of forming by binary data to packed data;
B) in intermediate file, read the picture width of 4 bytes and the sum of all pixels of 4 bytes, wherein picture height=sum of all pixels/picture width;
C) in the buffer memory of client 2, create a blank picture according to picture height and picture width;
D) calculate the length of the alpha passage file of forming by the alpha channel data of all pixels according to sum of all pixels, read the data of respective length again; Remaining data are the RGB compressed file through lossy compression method, use this RGB compressed file of Huffman encoding decoding, generate RGB passage file;
E) RGB channel data corresponding in alpha channel data in the alpha passage file and the RGB passage file is merged into pixel value; Each pixel value is inserted in the blank picture that step c) created according to sequencing, generated decompressing files and use.
Should be pointed out that the above embodiment can make those skilled in the art more fully understand the invention, but do not limit the present invention in any way creation.Therefore; Although this specification has carried out detailed explanation with reference to accompanying drawing and embodiment to the invention,, those skilled in the art are to be understood that; Still can make amendment or be equal to replacement the invention; In a word, all do not break away from the technical scheme and the improvement thereof of the spirit and the scope of the invention, and it all should be encompassed in the middle of the protection range of the invention patent.
Claims (9)
1. picture compression method, its step comprises:
1) reads image data, said image data is pursued the scanning of pixel, the alpha channel data of each pixel is separated;
2) the alpha channel data of all pixels is merged into alpha passage file;
3) the RGB channel data of all pixels carries out lossy compression method, generates the RGB compressed file;
4) said alpha passage file and said RGB compressed file merge in the intermediate file; Said intermediate file is carried out lossless compress, generate packed data.
2. a kind of picture compression method as claimed in claim 1 is characterized in that: the alpha channel data in the said step 1) separates through bit manipulation.
3. a kind of picture compression method as claimed in claim 1 is characterized in that: the said intermediate file in the said step 4) is a binary file.
4. like claim 1 or 2 or 3 described a kind of picture compression methods, it is characterized in that: said intermediate file comprises: picture width, sum of all pixels, alpha passage file, RGB compressed file.
5. a kind of picture compression method as claimed in claim 4, it is characterized in that: the decompression step of said packed data comprises:
A) said packed data is decompressed obtain said intermediate file;
B) in said intermediate file, read said picture width and said sum of all pixels, picture height=sum of all pixels/picture width;
C) in memory, create a blank picture according to said picture height and said picture width;
D) read said alpha passage file and said RGB compressed file, said RGB compressed file is decompressed, generate RGB passage file;
E) the RGB channel data in alpha channel data in the said alpha passage file and the said RGB passage file is merged into pixel value, said pixel value is inserted in the said blank picture, be reduced into said image data.
6. like claim 1 or 2 or 3 or 5 described a kind of picture compression methods, it is characterized in that: said lossy compression method method adopts Huffman encoding.
7. like claim 1 or 2 or 3 or 5 described a kind of picture compression methods, it is characterized in that: said lossless compression method adopts the deflate algorithm.
8. a kind of picture compression method as claimed in claim 5, it is characterized in that: compression step carries out in server, generates said packed data, and said packed data is imported in the client through network; Said decompression step is carried out in said client, obtains image data after said packed data is decompressed.
9. a kind of picture compression method as claimed in claim 8 is characterized in that: said image data generates user's interface displayed in client.
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| CN103258167A (en) * | 2013-05-10 | 2013-08-21 | 广州杰赛科技股份有限公司 | Method for protecting png picture in handheld device |
| CN103514616A (en) * | 2013-09-02 | 2014-01-15 | 北京新学堂网络科技有限公司 | Method for reducing size of mobile electronic magazine file |
| CN103533352A (en) * | 2013-09-27 | 2014-01-22 | 桂林力港网络科技有限公司 | Compression method and device and decompression method and device for image with transparency |
| EP2892233A1 (en) * | 2014-01-06 | 2015-07-08 | Cisco Technology, Inc. | Fitting RGB and transparency information into 24 bits of just RGB |
| CN105719321A (en) * | 2016-01-22 | 2016-06-29 | 北京白鹭时代信息技术有限公司 | Texture compression method and device |
| CN105812714A (en) * | 2016-03-18 | 2016-07-27 | 浙江万朋教育科技股份有限公司 | Data compression method for shared PPT document pages |
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| CN107196660A (en) * | 2017-04-24 | 2017-09-22 | 南京数维康信息科技有限公司 | Low power consumption data compression algorithm |
| CN107507125A (en) * | 2017-08-31 | 2017-12-22 | 郑州云海信息技术有限公司 | Alpha passage palettes generation method, system and host side in a kind of WebP compression of images |
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