WO2011035658A1 - 一种透明图像的压缩和解压缩方法、装置和系统 - Google Patents

一种透明图像的压缩和解压缩方法、装置和系统 Download PDF

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Publication number
WO2011035658A1
WO2011035658A1 PCT/CN2010/075918 CN2010075918W WO2011035658A1 WO 2011035658 A1 WO2011035658 A1 WO 2011035658A1 CN 2010075918 W CN2010075918 W CN 2010075918W WO 2011035658 A1 WO2011035658 A1 WO 2011035658A1
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Prior art keywords
color channel
information
transparent
compression
image
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PCT/CN2010/075918
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English (en)
French (fr)
Inventor
谷沉沉
刘俊
何健
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腾讯科技(深圳)有限公司
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Priority to RU2012116577/08A priority Critical patent/RU2517398C2/ru
Priority to BR112012006764A priority patent/BR112012006764A2/pt
Publication of WO2011035658A1 publication Critical patent/WO2011035658A1/zh

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    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00Image coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/649Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding the transform being applied to non rectangular image segments

Definitions

  • the present invention relates to the field of digital images, and in particular, to a method, apparatus and system for compressing and decompressing transparent images. Background of the invention
  • Each pixel of these color digital images usually contains three color channel information of red (R), green (G), and blue (B), and each color channel information of each pixel generally needs to be represented by 8 bits. .
  • Transparent images are widely used in Internet web page production and games. Based on general color digital images, an 8-bit transparent color channel is added to each pixel.
  • the transparent color channel records the transparency information of the pixel, which can conveniently and flexibly realize the superposition and fusion of the image.
  • the image background can be made transparent, and the color information of the web page itself can be used instead of the transparent color, so that the image and the web page background can be well integrated.
  • image storage formats such as PNG (Por table Network Graphics), GIF (Graphics Interchange Format), etc., all support transparent color channels.
  • digital image compression methods can be divided into lossy compression and lossless compression.
  • Lossless compression does not have any information missing during compression and decompression, which can guarantee image quality without distortion, but its compression efficiency is low. Lossy compression will lose some information during compression, and sacrifice image quality to reduce data volume. , with higher compression efficiency.
  • the transparent color channel and the color channel information of the transparent image are all losslessly compressed, such as PNG, GIF and other image storage formats.
  • embodiments of the present invention provide a method, apparatus, and system for compressing and decompressing a transparent image.
  • a method for compressing a transparent image comprising:
  • Compressing the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image Compressing the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image.
  • the combining the color channel compression information and the transparent color channel compression information into compressed data comprises:
  • the compressed data format is: transparent color channel compression information length information, transparent color channel compression information, and color channel compression information, where The transparent color channel compression information length information is a preset number of bytes to represent the transparent color channel compression information length.
  • the obtaining color channel information and transparent color channel information of the original transparent image includes:
  • a method for decompressing a transparent image comprising: Obtaining a compressed transparent image, and parsing the compressed transparent image to obtain color channel compression information and transparent color channel compression information;
  • the color channel information and the transparent color channel information are combined into a target format to obtain a decompressed transparent image.
  • the parsing the compressed transparent image to obtain color channel compression information and transparent color channel compression information includes:
  • the color channel information and the transparent color channel information are combined according to the format of the target image to obtain the decompressed transparent image.
  • a compression device for a transparent image comprising:
  • An obtaining module configured to obtain color channel information and transparent color channel information of the original transparent image
  • a compression module configured to perform lossy compression on the color channel information to obtain color channel compression information, and perform lossless compression on the transparent color channel information Obtaining transparent color channel compression information
  • a data synthesizing module configured to synthesize the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image.
  • the data synthesizing module includes:
  • a data format synthesizing unit configured to compress the color channel compression information and the transparent color channel compression information according to a compressed data format, where the compressed data format is: transparent color channel compression information length information, transparent color channel compression information And the color channel compression information, wherein the transparent color channel compression information length information is a preset number of bytes to represent the transparent color channel compression information length.
  • a decompression device for a transparent image comprising:
  • a parsing module configured to acquire the compressed transparent image, and parse the compressed transparent image to obtain color channel compression information and transparent color channel compression information;
  • a decompression module configured to perform lossy decompression on the color channel compression information to obtain color channel information, and perform non-destructive decompression on the transparent color channel compression information to obtain transparent color channel information;
  • a format synthesis module configured to perform the target format synthesis on the color channel information and the transparent color channel information to obtain a decompressed transparent image.
  • the parsing module specifically includes:
  • a first acquiring unit configured to acquire channel compression information length information in the compressed transparent image
  • a second acquiring unit configured to acquire the transparent color channel compression information according to the channel compression information length information
  • a third acquiring unit configured to continue to acquire the color channel compression information after acquiring the transparent color channel compression information.
  • the format synthesis module specifically includes:
  • a fourth acquiring unit configured to acquire the color channel information and the transparent color channel information
  • a format synthesizing unit configured to synthesize the color channel information and the transparent color channel information according to a format of the target image, to obtain the Unzip the transparent image.
  • a compression system for a transparent image comprising: a compression device and a decompression device, wherein the compression device is configured to acquire color channel information and transparent color channel information of an original transparent image; Loss compression obtains color channel compression information, and performs lossless compression on the transparent color channel information to obtain transparent color channel compression information; and compresses the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image;
  • the decompressing device is configured to acquire the compressed transparent image, and parse the compressed transparent image to obtain the color channel compression information and the transparent color channel compression information; and the color channel compression information is performed Decompressing and decompressing to obtain the color channel information, performing non-destructive decompression on the transparent color channel compression information to obtain the transparent color channel information; synthesizing the color channel information and the transparent color channel information into a target format to obtain a decompression Transparent image.
  • the compression device includes
  • An obtaining module configured to obtain color channel information and transparent color channel information of the original transparent image
  • a compression module configured to perform lossy compression on the color channel information to obtain color channel compression information, and perform lossless compression on the transparent color channel information Obtaining transparent color channel compression information
  • a data synthesizing module configured to synthesize the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image.
  • the data synthesizing module includes:
  • a data format synthesizing unit configured to compress the color channel compression information and the transparent color channel compression information according to a compressed data format, where the compressed data format is: transparent color channel compression information length information, transparent color channel compression information And the color channel compression information, wherein the transparent color channel compression information length information is a preset number of bytes to represent the transparent color channel compression information length.
  • the decompression device includes
  • a parsing module configured to acquire the compressed transparent image, and parse the compressed transparent image to obtain color channel compression information and transparent color channel compression information;
  • a decompression module configured to perform lossy decompression on the color channel compression information to obtain color channel information, and perform non-destructive decompression on the transparent color channel compression information to obtain transparent color channel information;
  • a format synthesis module configured to perform the target format synthesis on the color channel information and the transparent color channel information to obtain a decompressed transparent image.
  • the parsing module specifically includes:
  • a first acquiring unit configured to acquire channel compression information length information in the compressed transparent image
  • a second acquiring unit configured to acquire the transparent color channel compression information according to the channel compression information length information
  • a third acquiring unit configured to continue to acquire the color channel compression information after acquiring the transparent color channel compression information.
  • the format synthesis module specifically includes:
  • a fourth acquiring unit configured to acquire the color channel information and the transparent color channel information
  • a format synthesizing unit configured to: use the color channel information and the transparent color channel information according to a target The format of the image is synthesized to obtain the decompressed transparent image.
  • the solution provided by the embodiment of the present invention adopts lossless compression on the transparent color channel information of the transparent image, and adopts lossy compression on each color channel information, and organizes the compressed transparent color channel information and color channel information according to a specific format to remove
  • the redundancy included in the image information improves the compression efficiency of the transparent image, thereby reducing the storage space and bandwidth resource consumption during image storage and network transmission, and the transparent color channel information is not lost during the compression process, and does not affect the image.
  • Subjective quality BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a schematic flow chart of a transparent image compression method according to Embodiment 1 of the present invention.
  • FIG. 2 is a schematic structural diagram of a transparent image compression apparatus according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic flowchart of a transparent image decompression method according to Embodiment 1 of the present invention.
  • FIG. 4 is a schematic structural diagram of a transparent image decompressing apparatus according to Embodiment 1 of the present invention.
  • FIG. 5 is a schematic flowchart of a transparent image compression and decompression method according to Embodiment 2 of the present invention
  • FIG. 6 is a schematic diagram of a compression apparatus according to Embodiment 3 of the present invention
  • FIG. 7 is a schematic diagram of a decompression device according to Embodiment 3 of the present invention.
  • FIG. 8 is a schematic structural diagram of an analysis module according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic structural diagram of a format synthesis module according to Embodiment 3 of the present invention.
  • Figure 10 is a schematic diagram of a system provided in Embodiment 4 of the present invention. Mode for carrying out the invention
  • the embodiment of the present invention provides a method for compressing a transparent image, which uses lossless compression for transparent color channel information and lossy compression for each color channel information. And organize the compressed transparent channel letter in a specific format Information and color channel information, thereby improving the compression efficiency of transparent images.
  • the compression method includes:
  • the original transparent image needs to be parsed, and the transparent color channel information and each color channel information are separated.
  • the original transparent image is parsed, and the image processing software or other forms of tools may be used, as long as the transparent color channel information can be separated.
  • the color channel information is not limited in this embodiment of the present invention.
  • the color channel information and the transparent color channel information of the original transparent image are obtained by: decompressing the original transparent image by using a decompressing format corresponding to the original transparent image compression format to obtain original transparent image information;
  • the color channel information and the transparent color channel information of the original transparent image are separated from the original transparent image information.
  • the color channel information in the embodiment of the present invention refers to three color channel information of R (red), G (green), and B (blue), and each color channel information of each pixel generally uses 8 bits. It is indicated that the transparent color channel information is generally also represented by 8 bits.
  • the lossless compression of the transparent color channel information may be performed by using the commonly used LZW compression to obtain the transparent color channel compression data, and other lossless compression formats may be used, which are not limited in the embodiment of the present invention; lossy compression such as JPEG2000 is used for each color channel information.
  • the lossy compression, the JPEG2000 compressed data is obtained, or the JPEG lossy compression is used, and the JPEG compressed data is obtained.
  • Other lossy compression formats may also be used, which are not limited in the embodiment of the present invention.
  • the color channel compression information and the transparent color channel compression information are combined into compressed data, which are:
  • the color channel compression information and the transparent color channel compression information are compressed according to the compressed data format.
  • the compressed data format is: transparent color channel compression information length information, transparent color channel compression information, and color channel compression information, wherein the transparent color channel compression information length information is a preset number of bytes to represent the transparent color channel compression information length.
  • the original transparent image is parsed in the original format, and then the LZW compression of the transparent color channel information is performed respectively to perform JEEG2000 compression on each color channel information, and the transparent color channel is compressed and JPEG2000.
  • the data is compressed and synthesized to obtain transparent image compressed data.
  • FIG. 3 is a schematic diagram of a process for implementing a transparent image decompression according to the present invention, and the specific process is as follows:
  • the decompression system of the transparent image needs to know the corresponding compressed data format in advance, or notify the compression system of the transparent image data compression format by sending a notification message during the decompression process.
  • the non-destructive decompression of the transparent color channel compressed data may be performed by using a common LZW decompression to obtain transparent color channel information, and other non-destructive decompression formats may be used, but the non-destructive decompression format adopted by the method must be used in step 102.
  • the lossless compression format is consistent, otherwise the decompression process of the compressed data of the transparent color channel cannot be realized.
  • the lossy decompression of the compressed data of each color channel can be decompressed by JPEG2000 to obtain the color channel information of the JPEG2000 format. Or use JPEG decompression to get JPEG-style color channel information.
  • the lossy decompression format of other formats can also be used, but the lossy decompression format used must be consistent with the lossy compression format used in step 102. Otherwise, the decompression process of the compressed data of each color channel cannot be realized.
  • Lossless decompression of transparent color channel compressed data and lossy compression of color channel data Decompression can be performed in parallel at the same time. It is also possible to perform lossless decompression on the transparent color channel compressed data and then lossy decompress the compressed data of each color channel, or firstly perform lossy decompression on each color channel compressed data and then transparently
  • the channel compression data is subjected to lossless decompression, and the sequence of the decompression process is not limited in the embodiment of the present invention.
  • the transparent images of each format have their own specific format.
  • the transparent image of PNG and the transparent image of G IF have different formats, so the decompressed transparent will be according to the target image format required for the actual application.
  • the color channel information and the decompressed color channel information are synthesized according to the target image format to obtain a decompressed transparent image.
  • a compressed image of a transparent image of PNG can be synthesized into a transparent image of the GI F format in accordance with the GI F format.
  • FIG. 4 is a schematic structural diagram of a transparent image decompressing apparatus of the present invention: First, the compressed image format is parsed for the transparent image compressed data, and then the LZW decompressed is performed on the transparent color channel compressed data, and the JEEG2000 decompressed the compressed data of each color channel. And combining the decompressed transparent color channel information and each color channel information into a specific format to obtain a target image.
  • the method provided by the embodiment of the present invention adopts lossless compression on the transparent color channel information of the transparent image, and adopts lossy compression on each color channel information, and organizes the compressed transparent color channel information and color channel information according to a specific format to remove
  • the redundancy included in the image information improves the compression efficiency of the transparent image, thereby reducing the storage space and bandwidth resource consumption during image storage and network transmission, and the transparent color channel information is not lost during the compression process, and does not affect the image.
  • Subjective quality Example 2
  • FIG. 5 is a schematic flow chart of the method of Embodiment 2, including compression and decompression of a transparent image: wherein 501 - 503 are compression processes of transparent images, and 504 - 506 are decompression processes of transparent images.
  • the color channel information in the embodiment of the present invention refers to three color channel information of R (red), G (green), and B (blue), and each color channel information of each pixel generally uses 8 bits. It is indicated that the transparent color channel information is generally also represented by 8 bits.
  • transparent image processing software or other processing tools are different according to the original format of each image and corresponding to different formats.
  • the commonly used transparent image format is mainly transparent image of PNG format and GIF format.
  • Transparent image for other image formats that support transparent color channel information, the original image can be parsed to separate transparent color channel information and color channel information.
  • the original transparent image in the embodiment of the present invention refers to a transparent image in a PNG format or a transparent image in a GIF format
  • a transparent image in a PNG format and a transparent image in a GIF format are themselves a lossless compressed image format, that is, PNG.
  • the transparent image of the format and the transparent image of the GIF format are already compressed image formats.
  • the original transparent image of the PNG format or the original of the GIF format is required.
  • the transparent image is subjected to lossless decompression to obtain source data of the transparent image, and then separated to obtain transparent color channel information and each color channel information.
  • the digital image compression method can be divided into lossy compression and lossless compression.
  • Lossless compression does not have any information missing during compression and decompression, which can guarantee image quality without distortion, but its compression efficiency is low. Lossy compression will lose some information during compression, and sacrifice image quality to reduce data volume. , with higher compression efficiency.
  • the still image compression standard JPEG and JPEG2000 are algorithms that use lossy compression to effectively compress the amount of image data while ensuring that the subjective quality of the image is not significantly affected.
  • JPEG2000 is the latest still image compression standard, and its compression efficiency is significantly higher than JPEG, which can achieve better visual effects at low bit rates.
  • the redundancy of image data mainly manifests as: spatial redundancy caused by correlation between adjacent pixels in the image; spectral redundancy caused by correlation of different color planes or spectral bands; human visual system for image information
  • the visual redundancy of the less sensitive part Since the color channel information between each pixel has large spatial redundancy, spectral redundancy and visual redundancy, the transparent color channel information of the image usually has a large number of consecutive equal transparent color channel pixel values, which is lossless compression.
  • the compression efficiency is high, and humans have strong visual sensitivity to the transparent color channel information, so the color channel information is lossyly compressed and the transparent color channel information is losslessly compressed.
  • the conventional LZW compression can be used to obtain the transparent color channel compression data, and other lossless compression formats can also be used, which are not limited in the embodiment of the present invention; the lossy compression is used for each color channel information, such as JPEG2 QQQ. Loss compression, JPEG2 QQQ compressed data or JPEG lossy compression is used to obtain JPEG compressed data, and other lossy compression formats may be used, which are not limited in the embodiment of the present invention.
  • Lossless compression of transparent color channel information and lossy compression of each color channel information can be performed simultaneously in parallel, or lossless compression of transparent color channel information and lossy compression of each color channel information or first color channel The information is subjected to lossy compression and then the lossless compression of the transparent color channel information.
  • the sequence of the compression process is not limited in the embodiment of the present invention.
  • 503 Compressing data on the transparent color channel and synthesizing the color channel compressed data to obtain transparent image compressed data.
  • the format of the transparent image compression data used in the embodiment of the present invention is as shown in Table 1:
  • the first is a 4-byte integer, which indicates the length of the transparent color channel compressed data, and then the transparent color channel compression data, and the color channel compression. data. For example, if the number of the first 4 bytes is 1 0, it can be known that the length of the transparent color channel compressed data is 10 bytes, then the data of the 5th to 14th bytes is the compressed data of the clear color channel. And the 15th
  • the first four bytes are used to identify the length of the transparent color channel compressed data, and other bytes, such as three bytes or six bytes, may be set according to actual needs, which is not limited in this embodiment of the present invention.
  • the transparent color channel compressed data and the color channel compressed data may be sequentially changed, that is, each color channel compressed data is compressed after the front transparent color channel is compressed. At this time, if the number of the first 4 bytes is 10, it is necessary to compress the data from the back 10 bytes to the transparent color channel, and the byte between the first 4 bytes and the last 10th byte. Compress data for each color channel.
  • the length of the transparent color channel compressed data is represented by an integer of 4 bytes instead of representing the length of the compressed data of each color channel because the length of the compressed data of each color channel is generally larger than the transparent color channel compressed data.
  • the length if it represents the length of each color channel compressed data, you need to take out more bytes, which will inevitably lead to an increase in the amount of data.
  • step 503 After obtaining the transparent image compression data, according to the compressed transparent image data format in step 503, first reading the first 4 bytes to obtain the length information of the transparent color channel compressed data, and then reading the transparent color channel compressed data according to the length information. , then read if each color channel compresses the data. For example: Read the first 4 bytes to get the length of the transparent color channel compressed data is 15 bytes, then read 15 bytes from the 5th byte, that is, read to the 19th byte, the 5th The contents of the byte to the 19th byte are the transparent color channel compressed data; the 20th byte and subsequent contents compress the data for each color channel.
  • the corresponding change in the step is to change the manner in which the transparent image is compressed. Therefore, for the decompression system of the transparent image, the data format used in the compression process of the transparent image, Must be consistent with the decompression process. If there are multiple formats, the decompression system needs to know the corresponding compressed data format in advance, or notify the decompression system to compress the transparent image data compression format by sending a notification message during the decompression process.
  • 505 performing lossless decompression on the transparent color channel compressed data and performing lossy decompression on the compressed data of each color channel, respectively, to obtain transparent color channel information and each color channel information;
  • the non-destructive decompression of the transparent color channel compressed data can be decompressed by the commonly used LZW to obtain transparent color channel information, and other non-destructive decompression formats can also be used, but the non-destructive decompression method is adopted.
  • the reduced format must be consistent with the lossless compression format used in step 502, otherwise the decompression process for the transparent color channel compressed data cannot be achieved.
  • the lossy decompression of the compressed data of each color channel can be decompressed by JPEG2000, and the color channel information of the JPEG2000 format is obtained. Or use JPEG decompression to get JPEG-style color channel information.
  • the lossy decompression format of other formats may also be used, but the lossy decompression format used must be consistent with the lossy compression format used in step 502. Otherwise, the decompression process of the compressed data of each color channel cannot be implemented.
  • Lossless decompression of transparent color channel compressed data and lossy decompression of compressed data of each color channel can be performed in parallel at the same time. It is also possible to perform lossless decompression on the transparent color channel compressed data and then damage the compressed data of each color channel. Decompressing, or performing lossy decompression on each color channel compressed data and then performing lossless decompression on the transparent color channel compressed data.
  • the sequence of the decompression process is not limited in the embodiment of the present invention.
  • the transparent images of each format have their own specific format.
  • the transparent image of PNG and the transparent image of GIF have different formats, so the decompressed transparent color should be according to the target image format required by the actual application.
  • the channel information and the decompressed color channel information are synthesized according to the target image format to obtain a decompressed transparent image.
  • a compressed image of a transparent image of a PNG can be synthesized into a transparent image of a GIF format in accordance with the GIF format.
  • the above steps 504-506 are processes for decompressing the transparent image compressed data
  • the above steps 501-506 are processes for compressing the original transparency for transmission and storage, and decompressing the compressed transparent image.
  • the method provided by the embodiment of the present invention adopts lossless compression on the transparent color channel information of the transparent image, and adopts lossy compression on each color channel information, and organizes the compressed transparent color channel information and color channel information according to a specific format to remove
  • the redundancy included in the image information improves the compression efficiency of the transparent image, thereby reducing the storage space and bandwidth resource consumption during image storage and network transmission, and the transparent color channel information is not lost during the compression process, and does not affect the image.
  • Subjective quality Example 3
  • the embodiment of the present invention provides a compression device for a transparent image.
  • the device includes: an acquisition module 601, configured to acquire color channel information and transparent color channel information of an original transparent image; and a compression module 602, configured to The channel information is subjected to lossy compression to obtain color channel compression information, and the transparent color channel information is losslessly compressed to obtain transparent color channel compression information;
  • the data synthesizing module 603 is configured to compress the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image.
  • the data synthesis module 603 includes:
  • the data format synthesizing unit is configured to compress the color channel compression information and the transparent color channel compression information according to the compressed data format, and the compressed data format is: the transparent color channel compresses the information length information, and then the transparent color channel compression information and the color channel respectively. Compressed information, wherein the transparent color channel compression information length information is a preset number of bytes to represent the length of the transparent color channel compression information.
  • the embodiment of the present invention further provides a transparent image decompression device.
  • the device further includes:
  • the parsing module 704 is configured to obtain a compressed transparent image, and parse the compressed transparent image to obtain color channel compression information and transparent color channel compression information;
  • the decompression module 705 is configured to perform lossy decompression on the color channel compression information to obtain color channel information, and perform non-destructive decompression on the transparent color channel compression information to obtain transparent color channel information;
  • the format synthesis module 706 is configured to perform color synthesis of the color channel information and the transparent color channel information to obtain a decompressed transparent image.
  • the first obtaining unit 7041 is configured to obtain channel compression information length information in the compressed transparent image;
  • the second acquiring unit 7042 is configured to obtain transparent color channel compression information according to the channel compression information length information;
  • the third obtaining unit 7043 is configured to obtain the color channel compression information after acquiring the transparent color channel compression information.
  • the fourth obtaining unit 7061 is configured to acquire the color channel information and the transparent color channel information.
  • the format synthesizing unit 7062 is configured to synthesize the color channel information and the transparent color channel information according to the format of the target image to obtain a decompressed transparent image.
  • the device provided by the embodiment of the invention adopts lossless compression on the transparent color channel information of the transparent image, adopts lossy compression on each color channel information, and organizes the compressed transparent color channel information and color channel information according to a specific format to remove
  • the redundancy included in the image information improves the compression efficiency of the transparent image, thereby reducing the storage space and bandwidth resource consumption during image storage and network transmission, and the transparent color channel information is not lost during the compression process, and does not affect the image.
  • the embodiment of the present invention further provides a transparent image compression system.
  • the system includes: a compression device 1 001 and a decompression device 1 002, wherein
  • the compression device 1 001 is configured to obtain color channel information and transparent color channel information of the original transparent image; perform lossy compression on the color channel information to obtain color channel compression information, and perform lossless compression on the transparent color channel information to obtain transparent color channel compression information; Compressing the color channel compression information and the transparent color channel compression information to obtain a compressed transparent image;
  • the decompression device 1 002 is configured to obtain a compressed transparent image, and parse the compressed transparent image to obtain color channel compression information and transparent color channel compression information; perform lossy decompression on the color channel compression information to obtain color channel information, and be transparent
  • the color channel compression information is subjected to lossless decompression to obtain transparent color channel information; the color channel information and the transparent color channel information are combined into a target format to obtain a decompressed transparent image.
  • the system provided by the embodiment of the present invention adopts lossless compression on the transparent color channel information of the transparent image, and adopts lossy compression on each color channel information, and organizes the compressed transparent color channel information and color channel information according to a specific format to remove
  • the redundancy included in the image information improves the compression efficiency of the transparent image, thereby reducing the storage space and bandwidth resource consumption during image storage and network transmission.
  • the transparent color channel information is not lost during the compression process, and does not affect the subjective quality of the image.
  • the term "receiving" in the embodiment of the present invention may be understood as actively acquiring information from other modules or receiving information sent by other modules.
  • modules in the apparatus of the embodiments may be described in the apparatus of the embodiments as described in the embodiments, and the corresponding changes may be made in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into a plurality of sub-modules.
  • Some of the steps in the embodiments of the present invention may be implemented by using software, and the corresponding software program may be stored in a readable storage medium, such as an optical disk or a hard disk.

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Description

一种透明图像的压缩和解压缩方法、 装置和系统 技术领域
本发明涉及数字图像领域, 特别涉及一种透明图像的压缩和解压缩方法、 装置和系统。 发明背景
随着互联网技术的发展和普遍应用, 网络越来越影响人们的工作以及生活 方式。 由于图片信息具有直观性强, 内容丰富等特点, 因此在网站、 网络游戏 中都采用了大量的图片。 这些彩色数字图像的每个像素点通常包含了红(R ), 绿(G ), 蓝(B )三种色彩通道信息, 而每个像素点的每种色彩通道信息一般需 要用 8比特来表示。
透明图像是在互联网网页制作和游戏中获得广泛采用的图像, 它是在一般 彩色数字图像的基础上, 对每个像素增加一个 8比特的透明色通道。 透明色通 道记录该像素点的透明度信息, 可以方便灵活地实现图片的叠加融合。 例如在 制作网页图像时, 可以把图像背景设为透明, 用网页本身的颜色信息来代替设 为透明的色彩, 这样可使图像和网页背景很好地融合。 目前比较流行的图片存 储格式, 如 PNG (Por table Network Graphics,便携网络图形)、 GIF (Graphics Interchange Format,图像互换格式)等, 均支持透明色通道。
由于数字图像的原始数据量非常庞大, 于是在存储和网络传输数字图像信 息时就需要先进行图像压缩, 去除冗余数据, 达到减少数据比特数的目的。 目 前, 数字图像压缩方法可以分为有损压缩和无损压缩两种。 无损压缩在压缩和 解压缩的过程中没有任何信息缺失, 可以保证图像质量不失真, 但是其压缩效 率较低; 而有损压缩在压缩过程中会丟失一部分信息, 牺牲一定的图像质量来 减少数据量, 具有更高的压缩效率。 目前, 对透明图像的透明色通道和各色彩 通道信息都采用无损压缩, 如 PNG , GIF等图片存储格式。
目前, 对于透明图像, 采用无损压缩方法, 不能去除图像信息中包含的空 间冗余, 视觉冗余等多余数据, 因此压缩效率远远低于 JPEG (Joint Photographic Exper t s Group,联合图像专家组), JPEG2000等常用的图像有损 压缩标准, 在图片存储和网络传输时需要消耗大量的存储空间和带宽资源; 如 果采用有损压缩方法, 则导致透明图像中的透明色通道信息在压缩过程中会丟 失, 影响了图像的质量。 发明内容
为了提高透明图像的压缩效率, 同时不明显降低图像的主观质量, 本发明 实施例提供了一种透明图像的压缩和解压缩方法、 装置和系统。 所述技术方案 :¾口下:
一种透明图像的压缩方法, 所述方法包括:
获取原始透明图像的色彩通道信息和透明色通道信息;
对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色 通道信息进行无损压缩得到透明色通道压缩信息;
将所述色彩通道压缩信息和所述透明色通道压缩信息进行压缩数据合成, 得到压缩透明图像。
所述将所述色彩通道压缩信息和所述透明色通道压缩信息进行压缩数据合 成包括:
将所述色彩通道压缩信息和所述透明色通道压缩信息按照压缩数据格式进 行压缩, 所述压缩数据格式依次为: 透明色通道压缩信息长度信息、 透明色通 道压缩信息和色彩通道压缩信息, 其中所述透明色通道压缩信息长度信息为预 设一定的字节数来表示透明色通道压缩信息长度。
所述获取原始透明图像的色彩通道信息和透明色通道信息包括:
将所述原始透明图像采用与所述原始透明图像压缩格式相对应的解压缩格 式进行解压缩, 得到所述原始透明图像信息;
分离出所述原始透明图像的所述色彩通道信息和所述透明色通道信息。 一种透明图像的解压缩方法, 所述方法包括: 获取压缩透明图像, 并对所述压缩透明图像进行解析, 得到色彩通道压缩 信息和透明色通道压缩信息;
对所述色彩通道压缩信息进行有损解压缩得到色彩通道信息, 对所述透明 色通道压缩信息进行无损解压缩得到透明色通道信息;
将所述色彩通道信息和所述透明色通道信息进行目标格式合成, 得到解压 透明图像。
所述对所述压缩透明图像进行解析, 得到色彩通道压缩信息和透明色通道 压缩信息包括:
获取所述压缩透明图像中的通道压缩信息长度信息;
根据所述通道压缩信息长度信息, 获取所述透明色通道压缩信息; 获取所述透明色通道压缩信息后, 获取所述色彩通道压缩信息。
所述将所述色彩通道信息和所述透明色通道信息进行目标格式合成, 得到 解压透明图像, 包括:
获取所述色彩通道信息和所述透明色通道信息;
将所述色彩通道信息和所述透明色通道信息按照所述目标图像的格式合 成, 得到所述解压透明图像。
一种透明图像的压缩装置, 所述装置包括:
获取模块, 用于获取原始透明图像的色彩通道信息和透明色通道信息; 压缩模块,用于对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色通道信息进行无损压缩得到透明色通道压缩信息;
数据合成模块, 用于将所述色彩通道压缩信息和所述透明色通道压缩信息 进行压缩数据合成, 得到压缩透明图像。
所述数据合成模块, 包括:
数据格式合成单元, 用于将所述色彩通道压缩信息和所述透明色通道压缩 信息按照压缩数据格式进行压缩, 所述压缩数据格式依次为: 透明色通道压缩 信息长度信息、 透明色通道压缩信息和色彩通道压缩信息, 其中所述透明色通 道压缩信息长度信息为预设一定的字节数来表示透明色通道压缩信息长度。 一种透明图像的解压缩装置, 所述装置包括:
解析模块, 用于获取所述压缩透明图像, 并对所述压缩透明图像进行解析, 得到色彩通道压缩信息和透明色通道压缩信息;
解压缩模块, 用于对所述色彩通道压缩信息进行有损解压缩得到色彩通道 信息, 对所述透明色通道压缩信息进行无损解压缩得到透明色通道信息;
格式合成模块, 用于将所述色彩通道信息和所述透明色通道信息进行目标 格式合成, 得到解压透明图像。
所述解析模块, 具体包括:
第一获取单元, 用于获取所述压缩透明图像中的通道压缩信息长度信息; 第二获取单元, 用于根据所述通道压缩信息长度信息, 获取所述透明色通 道压缩信息;
第三获取单元, 用于在获取所述透明色通道压缩信息后, 继续获取所述色 彩通道压缩信息。
所述格式合成模块, 具体包括:
第四获取单元, 用于获取所述色彩通道信息和所述透明色通道信息; 格式合成单元, 用于将所述色彩通道信息和所述透明色通道信息按照目标 图像的格式合成, 得到所述解压透明图像。
一种透明图像的压缩系统, 所述系统包括: 压缩装置和解压缩装置, 其中, 所述压缩装置,用于获取原始透明图像的色彩通道信息和透明色通道信息; 对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色通道 信息进行无损压缩得到透明色通道压缩信息; 将所述色彩通道压缩信息和所述 透明色通道压缩信息进行压缩数据合成, 得到压缩透明图像;
所述解压缩装置, 用于获取所述压缩透明图像, 并对所述压缩透明图像进 行解析, 得到所述色彩通道压缩信息和所述透明色通道压缩信息; 对所述色彩 通道压缩信息进行有损解压缩得到所述色彩通道信息, 对所述透明色通道压缩 信息进行无损解压缩得到所述透明色通道信息; 将所述色彩通道信息和所述透 明色通道信息进行目标格式合成, 得到解压透明图像。 所述压缩装置包括,
获取模块, 用于获取原始透明图像的色彩通道信息和透明色通道信息; 压缩模块,用于对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色通道信息进行无损压缩得到透明色通道压缩信息;
数据合成模块, 用于将所述色彩通道压缩信息和所述透明色通道压缩信息 进行压缩数据合成, 得到压缩透明图像。
所述数据合成模块, 包括:
数据格式合成单元, 用于将所述色彩通道压缩信息和所述透明色通道压缩 信息按照压缩数据格式进行压缩, 所述压缩数据格式依次为: 透明色通道压缩 信息长度信息、 透明色通道压缩信息和色彩通道压缩信息, 其中所述透明色通 道压缩信息长度信息为预设一定的字节数来表示透明色通道压缩信息长度。
所述解压缩装置包括,
解析模块, 用于获取所述压缩透明图像, 并对所述压缩透明图像进行解析, 得到色彩通道压缩信息和透明色通道压缩信息;
解压缩模块, 用于对所述色彩通道压缩信息进行有损解压缩得到色彩通道 信息, 对所述透明色通道压缩信息进行无损解压缩得到透明色通道信息;
格式合成模块, 用于将所述色彩通道信息和所述透明色通道信息进行目标 格式合成, 得到解压透明图像。
所述解析模块, 具体包括:
第一获取单元, 用于获取所述压缩透明图像中的通道压缩信息长度信息; 第二获取单元, 用于根据所述通道压缩信息长度信息, 获取所述透明色通 道压缩信息;
第三获取单元, 用于在获取所述透明色通道压缩信息后, 继续获取所述色 彩通道压缩信息。
所述格式合成模块, 具体包括:
第四获取单元, 用于获取所述色彩通道信息和所述透明色通道信息; 格式合成单元, 用于将所述色彩通道信息和所述透明色通道信息按照目标 图像的格式合成, 得到所述解压透明图像。
本发明实施例提供的方案, 通过对透明图像的透明色通道信息采用无损压 缩, 而对各色彩通道信息采用有损压缩, 并按照特定格式组织压缩后的透明色 通道信息和色彩通道信息, 去除图像信息中包含的冗余, 提高了透明图像的压 缩效率, 进而在图片存储和网络传输时降低了存储空间和带宽资源的消耗, 同 时透明色通道信息在压缩过程中没有损失, 从而不影响图像的主观质量。 附图简要说明
图 1是本发明实施例 1提供的透明图像压缩方法流程示意图;
图 2是本发明实施例 1提供的透明图像压缩装置结构示意图;
图 3是本发明实施例 1提供的透明图像解压缩方法流程示意图;
图 4是本发明实施例 1提供的透明图像解压缩装置结构示意图;
图 5是本发明实施例 2提供的透明图像压缩和解压缩方法流程示意图; 图 6是本发明实施例 3提供的压缩装置示意图;
图 7是本发明实施例 3提供的解压缩装置示意图;
图 8是本发明实施例 3提供的解析模块结构示意图;
图 9是本发明实施例 3提供的格式合成模块结构示意图;
图 1 0是本发明实施例 4提供的系统示意图。 实施本发明的方式
为使本发明的目的、 技术方案和优点更加清楚, 下面将结合附图对本发明 实施方式作进一步地详细描述。 实施例 1
为了提高透明图像的压缩效率, 同时不明显降低图像的主观质量, 本发明 实施例提供了一种透明图像的压缩方法, 对透明色通道信息采用无损压缩, 而 对各色彩通道信息采用有损压缩, 并按照特定格式组织压缩后的透明色通道信 息和色彩通道信息, 从而提高透明图像的压缩效率。 参见图 1 , 该压缩方法包 括:
1 01: 获取原始透明图像的色彩通道信息和透明色通道信息;
其中, 需要对原始透明图像进行解析, 分离得到透明色信道信息和各色彩 信道信息; 对原始透明图像进行解析, 可以使用图像处理软件也可以使用其他 形式的工具, 只要能够分离出透明色通道信息和各色彩通道信息即可, 对此本 发明实施例不作限制。
其中, 获取原始透明图像的色彩通道信息和透明色通道信息, 具体为: 采用与原始透明图像压缩格式相对应的解压缩格式对原始透明图像进行解 压缩, 得到原始透明图像信息;
从原始透明图像信息分离出原始透明图像的色彩通道信息和透明色通道信 息。
其中, 本发明实施例中的色彩通道信息是指 R (红)、 G (绿)、 B (蓝)三种 色彩通道信息, 而每个像素点的每种色彩通道信息一般都用 8比特来表示, 透 明色通道信息一般也用 8比特表示。
1 02: 对色彩通道信息进行有损压缩得到色彩通道压缩信息,对透明色通道 信息进行无损压缩得到透明色通道压缩信息;
其中, 对透明色通道信息进行无损压缩可以采用常用的 LZW压缩, 得到透 明色通道压缩数据, 也可以采用其他无损压缩格式, 本发明实施例不作限制; 对各色彩通道信息采用有损压缩如 JPEG2000有损压缩, 得到 JPEG2000压缩数 据或者采用 JPEG有损压缩, 得到 JPEG压缩数据, 也可以采用其他有损压缩格 式, 本发明实施例不作限制。
1 03 : 将色彩通道压缩信息和透明色通道压缩信息进行压缩数据合成,得到 压缩透明图像。
其中, 将色彩通道压缩信息和透明色通道压缩信息进行压缩数据合成, 具 体为:
将色彩通道压缩信息和透明色通道压缩信息按照压缩数据格式进行压缩, 压缩数据格式依次为: 透明色通道压缩信息长度信息、 透明色通道压缩信息和 色彩通道压缩信息, 其中透明色通道压缩信息长度信息为预设一定的字节数来 表示透明色通道压缩信息长度。
实现透明图像压缩装置结构示意图参见图 2 : 首先对原始透明图像进行原 始格式解析, 然后再分别对透明色通道信息进行 LZW压缩对各色彩通道信息进 行 JEEG2000压缩, 并将透明色通道压缩数据和 JPEG2000压缩数据进行合成, 得到透明图像压缩数据。
图 3为实现本发明透明图像解压缩流程示意图, 具体过程如下:
301: 获取透明图像压缩数据, 按照步骤 1 03中的压缩透明图像数据格式, 首先读取透明色通道压缩数据的长度信息, 并根据该长度信息读取透明色通道 压缩数据, 然后再读取紧接着的各色彩通道压缩数据;
如果步骤 1 03中的压缩透明图像数据格式不同, 则该步骤中相应的改变读 取透明图像压缩数据的方式, 因此对于透明图像的解压缩系统而言, 透明图像 的压缩过程所采用的数据格式, 必须与解压缩过程保持一致。如果有多种格式, 解压缩系统需要预先获知相应的压缩数据格式, 或者在解压缩的过程中, 通过 发送一个通知信息通知压缩系统所采用的透明图像数据压缩格式。
302:分别对透明色通道压缩数据进行无损解压缩和对各色彩通道压缩数据 进行有损解压缩, 得到透明色通道信息和各色彩通道信息;
其中,对透明色通道压缩数据进行无损解压缩可以采用常用的 LZW解压缩, 得到透明色通道信息, 也可以采用其他无损解压缩格式, 但其采用的无损解压 缩格式必须和步骤 1 02中采用的无损压缩格式一致, 否则无法实现对透明色通 道压缩数据的解压缩过程。 对各色彩通道压缩数据进行有损解压缩可以采用 JPEG2000解压缩, 得到 JPEG2000格式的各色彩通道信息。 或者采用 JPEG解压 缩,得到 JPEG式的各色彩通道信息。 当然也可以采用其他格式的有损解压缩格 式, 但其采用的有损解压缩格式必须和步骤 1 02中采用的有损压缩格式一致, 否则无法实现对各色彩通道压缩数据的解压缩过程。
对透明色通道压缩数据进行无损解压缩和对各色彩通道压缩数据进行有损 解压缩可以同时并行进行, 也可以先对透明色通道压缩数据进行无损解压缩再 对各色彩通道压缩数据进行有损解压缩, 或者先对各色彩通道压缩数据进行有 损解压缩再对透明色通道压缩数据进行无损解压缩, 对于解压缩过程的先后顺 序本发明实施例不作限制。
303:对解压缩后的透明色通道信息和解压缩后的色彩通道信息按照特定格 式进行目标格式合成, 得到解压缩后的透明图像。
其中,每种格式的透明图像都有各自的特定格式,如 PNG的透明图像与 G IF 的透明图像所具有的格式不同, 所以要根据实际应用所需的目标图像格式, 将 解压缩后的透明色通道信息和解压缩后的色彩通道信息按照目标图像格式进行 合成, 得到解压缩后的透明图像。 例如可以将 PNG的透明图像的压缩图像按照 GI F格式合成 GI F格式的透明图像。
图 4为实现本发明透明图像解压缩装置结构示意图: 首先对透明图像压缩 数据进行压缩数据格式解析, 然后再分别对透明色通道压缩数据进行 LZW解压 缩,对各色彩通道压缩数据进行 JEEG2000解压缩, 并将解压后的透明色通道信 息和各色彩通道信息进行特定格式合成, 得到目标图像。
本发明实施例提供的方法, 通过对透明图像的透明色通道信息采用无损压 缩, 而对各色彩通道信息采用有损压缩, 并按照特定格式组织压缩后的透明色 通道信息和色彩通道信息, 去除图像信息中包含的冗余, 提高了透明图像的压 缩效率, 进而在图片存储和网络传输时降低了存储空间和带宽资源的消耗, 同 时透明色通道信息在压缩过程中没有损失, 从而不影响图像的主观质量。 实施例 2
图 5是实施例 2的方法流程示意图, 包括透明图像的压缩和解压缩: 其中 501 - 503是透明图像的压缩过程, 504 - 506是透明图像的解压缩过程。
501:对原始透明图像进行解析,分离出透明色信道信息和各色彩信道信息; 其中, 对原始透明图像进行解析, 可以使用图像处理软件也可以使用其他 形式的工具, 只要能够分离出透明色通道信息和各色彩通道信息即可, 对此本 发明实施例不作限制。
其中, 本发明实施例中的色彩通道信息是指 R (红)、 G (绿)、 B (蓝)三种 色彩通道信息, 而每个像素点的每种色彩通道信息一般都用 8比特来表示, 透 明色通道信息一般也用 8比特表示。
其中, 针对不同格式的透明图像, 图像处理软件或者其他处理工具根据各 个图像的原始格式不同而对应的采用不同的格式解析, 目前常用的透明图像的 格式主要为 PNG格式的透明图像和 GIF格式的透明图像, 对于其他支持透明色 通道信息的图像格式都可以进行原始图像解析, 分离出透明色通道信息和色彩 通道信息。
其中, 本发明实施例中的原始透明图像是指 PNG格式的透明图像或 GIF格 式的透明图像, 而对于 PNG格式的透明图像和 GIF格式的透明图像其本身是采 用无损压缩的图像格式, 即 PNG格式的透明图像和 G I F格式的透明图像是已经 压缩过的图像格式, 再进行原始图像解析分离出透明色信道信息和各色彩信道 信息时, 首先需要对 PNG格式的原始透明图像或 GIF格式的原始透明图像进行 无损解压缩, 得到透明图像的源数据, 然后再进行分离得到透明色信道信息和 各色彩信道信息。
502:分别对透明色通道信息进行无损压缩和对各色彩通道信息进行有损压 缩, 得到透明色通道压缩数据和各色彩通道压缩数据;
其中, 数字图像压缩方法可以分为有损压缩和无损压缩两种。 无损压缩在 压缩和解压缩的过程中没有任何信息缺失, 可以保证图像质量不失真, 但是其 压缩效率较低; 而有损压缩在压缩过程中会丟失一部分信息, 牺牲一定的图像 质量来减少数据量, 具有更高的压缩效率。 目前广泛应用的静止图像压缩标准 JPEG和 JPEG2000就是采用有损压缩的算法, 使图像数据量得到有效的压缩, 同时又能保证图像的主观质量不受明显影响。 JPEG2000是目前最新的静止图像 压缩标准, 其压缩效率明显高于 JPEG, 在低比特率时能获得更好的视觉效果。
图像数据的冗余主要表现为:图像中相邻像素间的相关性引起的空间冗余; 不同彩色平面或频谱带的相关性引起的频谱冗余; 人类的视觉系统对图像信息 中敏感性较差部分的视觉冗余。 由于各个像素点之间的色彩通道信息存在较大 的空间冗余、 频谱冗余以及视觉冗余, 但是图像的透明色通道信息通常会出现 大量连续相等的透明色通道像素值, 采用无损压缩即可获得^艮高的压缩效率, 且人类对于透明色通道信息的视觉敏感性较强, 因此对色彩通道信息进行有损 压缩而对透明色通道信息进行无损压缩。
对透明色通道信息进行无损压缩可以采用常用的 LZW压缩, 得到透明色通 道压缩数据, 也可以采用其他无损压缩格式, 本发明实施例不作限制; 对各色 彩通道信息采用有损压缩如 JPEG2 Q Q Q有损压缩, 得到 JPEG2 Q Q Q压缩数据或者 采用 JPEG有损压缩, 得到 JPEG压缩数据, 也可以采用其他有损压缩格式, 本 发明实施例不作限制。
对透明色通道信息进行无损压缩和对各色彩通道信息进行有损压缩可以同 时并行进行, 也可以先对透明色通道信息进行无损压缩再对各色彩通道信息进 行有损压缩或者先对各色彩通道信息进行有损压缩再对透明色通道信息进行无 损压缩, 对于压缩过程的先后顺序本发明实施例不作限制。
503 : 对透明色通道压缩数据和对色彩通道压缩数据进行合成,得到透明图 像压缩数据。
其中, 本发明实施例采用的透明图像压缩数据格式如表 1所示: 首先是 4 字节的整数, 表示透明色通道压缩数据的长度, 然后依次为透明色通道压缩数 据, 以及各色彩通道压缩数据。 例如: 前 4个字节的表示的数字为 1 0 , 则可以 获知透明色通道压缩数据的长度为 1 0个字节, 那么第 5-14个字节的数据即为 明色通道压缩数据, 而第 15
表 1
压缩数据长度(4个字节) 透明色通道压缩数据 各色彩通道压缩数据
本发明实施例中设置前 4个字节用于标识透明色通道压缩数据的长度, 也 可以根据实际需要设置其他字节如 3个字节或者 6个字节, 对此本发明实施例 不作限制。 另外, 也可以将透明色通道压缩数据和各色彩通道压缩数据的顺序调换, 即各色彩通道压缩数据在前透明色通道压缩数据在后。 此时如果前 4个字节的 表示的数字为 10 , 则需要从后向前数 10个字节为透明色通道压缩数据, 前 4 个字节与倒数第 10个字节之间的字节为各色彩通道压缩数据。
本发明实施例中用 4个字节的整数来表示透明色通道压缩数据的长度而不 是来表示各色彩通道压缩数据的长度是由于一般各色彩通道压缩数据的长度远 远大于透明色通道压缩数据的长度, 如果表示各色彩通道压缩数据的长度, 需 要拿出更多的字节, 这样必然造成数据量的增加。
504: 获取透明图像压缩数据,读取 4字节的透明色通道压缩数据的长度信 息, 并根据该长度信息读取透明色通道压缩数据, 然后再读取紧接着的各色彩 通道压缩数据;
其中, 获取透明图像压缩数据后, 按照步骤 503中的压缩透明图像数据格 式, 首先读取前 4个字节获取透明色通道压缩数据的长度信息, 然后根据该长 度信息读取透明色通道压缩数据, 紧接着读取如果各色彩通道压缩数据。例如: 读取前 4个字节获取透明色通道压缩数据的长度为 15个字节,则从第 5个字节 开始顺序读取 15个字节即读到第 19字节为止,该第 5字节到第 19字节的内容 即为透明色通道压缩数据; 第 20 个字节及其以后的内容为各色彩通道压缩数 据。
如果步骤 503中的压缩透明图像数据格式不同, 则该步骤中相应的改变读 取透明图像压缩数据的方式, 因此对于透明图像的解压缩系统而言, 透明图像 的压缩过程所采用的数据格式, 必须与解压缩过程保持一致。如果有多种格式, 解压缩系统需要预先获知相应的压缩数据格式, 或者在解压缩的过程中, 通过 发送一个通知信息通知解压缩系统压缩系统所采用的透明图像数据压缩格式。
505 :分别对透明色通道压缩数据进行无损解压缩和对各色彩通道压缩数据 进行有损解压缩, 得到透明色通道信息和各色彩通道信息;
其中,对透明色通道压缩数据进行无损解压缩可以采用常用的 LZW解压缩, 得到透明色通道信息, 也可以采用其他无损解压缩格式, 但其采用的无损解压 缩格式必须和步骤 502中采用的无损压缩格式一致, 否则无法实现对透明色通 道压缩数据的解压缩过程。 对各色彩通道压缩数据进行有损解压缩可以采用 JPEG2000解压缩, 得到 JPEG2000格式的各色彩通道信息。 或者采用 JPEG解压 缩,得到 JPEG式的各色彩通道信息。 当然也可以采用其他格式的有损解压缩格 式, 但其采用的有损解压缩格式必须和步骤 502中采用的有损压缩格式一致, 否则无法实现对各色彩通道压缩数据的解压缩过程。
对透明色通道压缩数据进行无损解压缩和对各色彩通道压缩数据进行有损 解压缩可以同时并行进行, 也可以先对透明色通道压缩数据进行无损解压缩再 对各色彩通道压缩数据进行有损解压缩, 或者先对各色彩通道压缩数据进行有 损解压缩再对透明色通道压缩数据进行无损解压缩, 对于解压缩过程的先后顺 序本发明实施例不作限制。
506:对解压缩后的透明色通道信息和解压缩后的色彩通道信息按照特定格 式进行目标格式合成, 得到解压缩后的透明图像。
其中,每种格式的透明图像都有各自的特定格式,如 PNG的透明图像与 GIF 的透明图像所具有的格式不同, 所以要根据实际应用所需的目标图像格式, 将 解压缩后的透明色通道信息和解压缩后的色彩通道信息按照目标图像格式进行 合成, 得到解压缩后的透明图像。 例如可以将 PNG的透明图像的压缩图像按照 GIF格式合成 GIF格式的透明图像。
上述步骤 504-506 为对透明图像压缩数据进行解压缩的过程, 上述步骤 501-506 为对原始透明进行压缩便于传输和存储, 以及对压缩的透明图像进行 解压缩的过程。
本发明实施例提供的方法, 通过对透明图像的透明色通道信息采用无损压 缩, 而对各色彩通道信息采用有损压缩, 并按照特定格式组织压缩后的透明色 通道信息和色彩通道信息, 去除图像信息中包含的冗余, 提高了透明图像的压 缩效率, 进而在图片存储和网络传输时降低了存储空间和带宽资源的消耗, 同 时透明色通道信息在压缩过程中没有损失, 从而不影响图像的主观质量。 实施例 3
本发明实施例提供了一种透明图像的压缩装置, 参见图 6 , 该装置包括: 获取模块 601 , 用于获取原始透明图像的色彩通道信息和透明色通道信息; 压缩模块 602 , 用于对色彩通道信息进行有损压缩得到色彩通道压缩信息, 对透明色通道信息进行无损压缩得到透明色通道压缩信息;
数据合成模块 603 , 用于将色彩通道压缩信息和透明色通道压缩信息进行 压缩数据合成, 得到压缩透明图像。
其中, 数据合成模块 603 , 包括:
数据格式合成单元, 用于将色彩通道压缩信息和透明色通道压缩信息按照 压缩数据格式进行压缩,压缩数据格式依次为: 透明色通道压缩信息长度信息、 之后分别为透明色通道压缩信息和色彩通道压缩信息, 其中透明色通道压缩信 息长度信息为预设一定的字节数来表示透明色通道压缩信息长度。
本发明实施例还提供了一种透明图像的解压缩装置, 参见图 7 , 该装置还 包括:
解析模块 704 , 用于获取压缩透明图像, 并对压缩透明图像进行解析, 得 到色彩通道压缩信息和透明色通道压缩信息;
解压缩模块 705 , 用于对色彩通道压缩信息进行有损解压缩得到色彩通道 信息, 对透明色通道压缩信息进行无损解压缩得到透明色通道信息;
格式合成模块 706 , 用于将色彩通道信息和透明色通道信息进行目标格式 合成, 得到解压透明图像。
其中, 解析模块 704 , 参见图 8 , 具体包括:
第一获取单元 7041 , 用于获取压缩透明图像中的通道压缩信息长度信息; 第二获取单元 7042 , 用于根据通道压缩信息长度信息, 获取透明色通道压 缩信息;
第三获取单元 7043 , 用于获取透明色通道压缩信息后, 继续获取色彩通道 压缩信息。
其中, 格式合成模块 706 , 参见图 8 , 具体包括: 第四获取单元 7061 , 用于获取色彩通道信息和透明色通道信息; 格式合成单元 7062 , 用于将色彩通道信息和透明色通道信息按照目标图像 的格式合成, 得到解压透明图像。
本发明实施例提供的装置, 通过对透明图像的透明色通道信息采用无损压 缩, 而对各色彩通道信息采用有损压缩, 并按照特定格式组织压缩后的透明色 通道信息和色彩通道信息, 去除图像信息中包含的冗余, 提高了透明图像的压 缩效率, 进而在图片存储和网络传输时降低了存储空间和带宽资源的消耗, 同 时透明色通道信息在压缩过程中没有损失, 从而不影响图像的主观质量。 实施例 4
本发明实施例还提供了一种透明图像的压缩系统,参见图 1 0 ,该系统包括: 压缩装置 1 001和解压缩装置 1 002 , 其中,
压缩装置 1 001 , 用于获取原始透明图像的色彩通道信息和透明色通道信 息; 对色彩通道信息进行有损压缩得到色彩通道压缩信息, 对透明色通道信息 进行无损压缩得到透明色通道压缩信息; 将色彩通道压缩信息和透明色通道压 缩信息进行压缩数据合成, 得到压缩透明图像;
解压缩装置 1 002 , 用于获取压缩透明图像, 并对压缩透明图像进行解析, 得到色彩通道压缩信息和透明色通道压缩信息; 对色彩通道压缩信息进行有损 解压缩得到色彩通道信息, 对透明色通道压缩信息进行无损解压缩得到透明色 通道信息; 将色彩通道信息和透明色通道信息进行目标格式合成, 得到解压透 明图像。
其中,压缩装置 1 001的具体结构以及功能参见 501 - 503 ;解压缩装置 1 002 的具体结构以及功能参见 504 - 506。
本发明实施例提供的系统, 通过对透明图像的透明色通道信息采用无损压 缩, 而对各色彩通道信息采用有损压缩, 并按照特定格式组织压缩后的透明色 通道信息和色彩通道信息, 去除图像信息中包含的冗余, 提高了透明图像的压 缩效率, 进而在图片存储和网络传输时降低了存储空间和带宽资源的消耗, 同 时透明色通道信息在压缩过程中没有损失, 从而不影响图像的主观质量。 本发明实施例中的 "接收" 一词可以理解为主动从其他模块获取也可以是 接收其他模块发送来的信息。
本领域技术人员可以理解附图只是一个优选实施例的示意图, 附图中的模 块或流程并不一定是实施本发明所必须的。
本领域技术人员可以理解实施例中的装置中的模块可以按照实施例描述分 布于实施例的装置中, 也可以进行相应变化位于不同于本实施例的一个或多个 装置中。 上述实施例的模块可以合并为一个模块, 也可以进一步拆分成多个子 模块。
上述本发明实施例序号仅仅为了描述, 不代表实施例的优劣。
本发明实施例中的部分步骤, 可以利用软件实现, 相应的软件程序可以存 储在可读取的存储介质中, 如光盘或硬盘等。
以上所述仅为本发明的较佳实施例, 并不用以限制本发明, 凡在本发明的 精神和原则之内, 所作的任何修改、 等同替换、 改进等, 均应包含在本发明的 保护范围之内。

Claims

权利要求书
1、 一种透明图像的压缩方法, 其特征在于, 所述方法包括:
获取原始透明图像的色彩通道信息和透明色通道信息;
对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色 通道信息进行无损压缩得到透明色通道压缩信息;
将所述色彩通道压缩信息和所述透明色通道压缩信息进行压缩数据合成, 得到压缩透明图像。
2、 如权利要求 1所述的方法, 其特征在于, 所述将所述色彩通道压缩信息 和所述透明色通道压缩信息进行压缩数据合成包括:
将所述色彩通道压缩信息和所述透明色通道压缩信息按照压缩数据格式进 行压缩, 所述压缩数据格式依次为: 透明色通道压缩信息长度信息、 透明色通 道压缩信息和色彩通道压缩信息, 其中所述透明色通道压缩信息长度信息为预 设一定的字节数来表示透明色通道压缩信息长度。
3、 如权利要求 1所述的方法, 其特征在于, 所述获取原始透明图像的色彩 通道信息和透明色通道信息包括:
将所述原始透明图像采用与所述原始透明图像压缩格式相对应的解压缩格 式进行解压缩, 得到所述原始透明图像信息;
分离出所述原始透明图像的所述色彩通道信息和所述透明色通道信息。
4、 一种透明图像的解压缩方法, 其特征在于, 所述方法包括:
获取压缩透明图像, 并对所述压缩透明图像进行解析, 得到色彩通道压缩 信息和透明色通道压缩信息;
对所述色彩通道压缩信息进行有损解压缩得到色彩通道信息, 对所述透明 色通道压缩信息进行无损解压缩得到透明色通道信息;
将所述色彩通道信息和所述透明色通道信息进行目标格式合成, 得到解压 透明图像。
5、 如权利要求 4所述的方法, 其特征在于, 所述对所述压缩透明图像进行 解析, 得到色彩通道压缩信息和透明色通道压缩信息包括:
获取所述压缩透明图像中的通道压缩信息长度信息;
根据所述通道压缩信息长度信息, 获取所述透明色通道压缩信息; 获取所述透明色通道压缩信息后, 获取所述色彩通道压缩信息。
6、 如权利要求 4所述的方法, 其特征在于, 所述将所述色彩通道信息和所 述透明色通道信息进行目标格式合成, 得到解压透明图像, 包括:
获取所述色彩通道信息和所述透明色通道信息;
将所述色彩通道信息和所述透明色通道信息按照所述目标图像的格式合 成, 得到所述解压透明图像。
7、 一种透明图像的压缩装置, 其特征在于, 所述装置包括:
获取模块, 用于获取原始透明图像的色彩通道信息和透明色通道信息; 压缩模块,用于对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色通道信息进行无损压缩得到透明色通道压缩信息;
数据合成模块, 用于将所述色彩通道压缩信息和所述透明色通道压缩信息 进行压缩数据合成, 得到压缩透明图像。
8、 如权利要求 7所述的装置, 其特征在于, 所述数据合成模块, 包括: 数据格式合成单元, 用于将所述色彩通道压缩信息和所述透明色通道压缩 信息按照压缩数据格式进行压缩, 所述压缩数据格式依次为: 透明色通道压缩 信息长度信息、 透明色通道压缩信息和色彩通道压缩信息, 其中所述透明色通 道压缩信息长度信息为预设一定的字节数来表示透明色通道压缩信息长度。
9、 一种透明图像的解压缩装置, 其特征在于, 所述装置包括:
解析模块, 用于获取所述压缩透明图像, 并对所述压缩透明图像进行解析, 得到色彩通道压缩信息和透明色通道压缩信息;
解压缩模块, 用于对所述色彩通道压缩信息进行有损解压缩得到色彩通道 信息, 对所述透明色通道压缩信息进行无损解压缩得到透明色通道信息;
格式合成模块, 用于将所述色彩通道信息和所述透明色通道信息进行目标 格式合成, 得到解压透明图像。
10、 如权利要求 9所述的装置, 其特征在于, 所述解析模块, 具体包括: 第一获取单元, 用于获取所述压缩透明图像中的通道压缩信息长度信息; 第二获取单元, 用于根据所述通道压缩信息长度信息, 获取所述透明色通 道压缩信息;
第三获取单元, 用于在获取所述透明色通道压缩信息后, 继续获取所述色 彩通道压缩信息。
11、 如权利要求 9所述的装置, 其特征在于, 所述格式合成模块, 具体包 括:
第四获取单元, 用于获取所述色彩通道信息和所述透明色通道信息; 格式合成单元, 用于将所述色彩通道信息和所述透明色通道信息按照目标 图像的格式合成, 得到所述解压透明图像。
12、 一种透明图像的压缩系统, 其特征在于, 所述系统包括: 压缩装置和 解压缩装置, 其中,
所述压缩装置,用于获取原始透明图像的色彩通道信息和透明色通道信息; 对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色通道 信息进行无损压缩得到透明色通道压缩信息; 将所述色彩通道压缩信息和所述 透明色通道压缩信息进行压缩数据合成, 得到压缩透明图像;
所述解压缩装置, 用于获取所述压缩透明图像, 并对所述压缩透明图像进 行解析, 得到所述色彩通道压缩信息和所述透明色通道压缩信息; 对所述色彩 通道压缩信息进行有损解压缩得到所述色彩通道信息, 对所述透明色通道压缩 信息进行无损解压缩得到所述透明色通道信息; 将所述色彩通道信息和所述透 明色通道信息进行目标格式合成, 得到解压透明图像。
1 3、 如权利要求 12所述的系统, 其特征在于, 所述压缩装置包括, 获取模块, 用于获取原始透明图像的色彩通道信息和透明色通道信息; 压缩模块,用于对所述色彩通道信息进行有损压缩得到色彩通道压缩信息, 对所述透明色通道信息进行无损压缩得到透明色通道压缩信息;
数据合成模块, 用于将所述色彩通道压缩信息和所述透明色通道压缩信息 进行压缩数据合成, 得到压缩透明图像。
14、 如权利要求 1 3所述的系统, 其特征在于, 所述数据合成模块, 包括: 数据格式合成单元, 用于将所述色彩通道压缩信息和所述透明色通道压缩 信息按照压缩数据格式进行压缩, 所述压缩数据格式依次为: 透明色通道压缩 信息长度信息、 透明色通道压缩信息和色彩通道压缩信息, 其中所述透明色通 道压缩信息长度信息为预设一定的字节数来表示透明色通道压缩信息长度。
15、 如权利要求 12所述的系统, 其特征在于, 所述解压缩装置包括, 解析模块, 用于获取所述压缩透明图像, 并对所述压缩透明图像进行解析, 得到色彩通道压缩信息和透明色通道压缩信息;
解压缩模块, 用于对所述色彩通道压缩信息进行有损解压缩得到色彩通道 信息, 对所述透明色通道压缩信息进行无损解压缩得到透明色通道信息;
格式合成模块, 用于将所述色彩通道信息和所述透明色通道信息进行目标 格式合成, 得到解压透明图像。
16、 如权利要求 15所述的系统, 其特征在于, 所述解析模块, 具体包括: 第一获取单元, 用于获取所述压缩透明图像中的通道压缩信息长度信息; 第二获取单元, 用于根据所述通道压缩信息长度信息, 获取所述透明色通 道压缩信息;
第三获取单元, 用于在获取所述透明色通道压缩信息后, 继续获取所述色 彩通道压缩信息。
17、 如权利要求 15所述的系统, 其特征在于, 所述格式合成模块, 具体包 括:
第四获取单元, 用于获取所述色彩通道信息和所述透明色通道信息; 格式合成单元, 用于将所述色彩通道信息和所述透明色通道信息按照目标 图像的格式合成, 得到所述解压透明图像。
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