CN105469433B - Picture compression method and equipment thereof - Google Patents
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Abstract
The embodiment of the invention discloses a picture compression method and equipment thereof, wherein the method comprises the following steps: extracting scaling data information of a scalable picture when the scalable picture is compressed; compressing the scalable picture from which the scaling data information is extracted, and generating a compressed picture after the compression; and adding the scaling data information to the picture information of the compressed picture. The method can ensure that the compressed picture after the scalable picture is subjected to lossy compression is correctly exported, and ensure that the compressed picture still has the function of adaptively adjusting the size.
Description
Technical Field
The invention relates to the technical field of computers, in particular to the technical field of picture processing, and particularly relates to a picture compression method and picture compression equipment.
Background
With the continuous development and improvement of the picture processing technology, a picture format of a scalable picture, namely, a 9.png format, developed for an Android system can be adaptively adjusted in size under the Android environment, so that the picture is more intelligent and attractive.
For uploading, downloading and storing of pictures, the pictures are often required to be directly subjected to lossy compression, so that scaling data information of the pictures in the png format is lost in the compression process, the pictures have error derivation phenomenon, and the function of self-adaptive size adjustment cannot be realized in the subsequent use process.
Disclosure of Invention
Embodiments of the present invention provide a picture compression method and device, which can ensure that a compressed picture after lossy compression of a scalable picture is correctly derived, and ensure that the compressed picture still has a function of adaptively adjusting a size.
In order to solve the foregoing technical problem, a first aspect of an embodiment of the present invention provides a picture compression method, which may include:
extracting scaling data information of a scalable picture when the scalable picture is compressed;
compressing the scalable picture from which the scaling data information is extracted, and generating a compressed picture after the compression;
and adding the scaling data information to the picture information of the compressed picture.
A second aspect of an embodiment of the present invention provides a picture compression device, which may include:
an information extraction unit for extracting scaling data information of a scalable picture when the scalable picture is compressed;
a compression unit configured to compress the scalable picture from which the scaling data information is extracted, and generate a compressed picture after the compression;
an information adding unit, configured to add the scaling data information to the picture information of the compressed picture.
In the embodiment of the invention, the scaling data information of the scalable picture is extracted, the scalable picture after the scaling data information is extracted is compressed, and the scaling data information is added into the picture information of the compressed picture again, so that the compressed picture retains the scaling data information, the integrity of the picture information in the process of lossy compression of the picture is ensured, the picture is ensured to be correctly exported, and meanwhile, the picture still has the function of self-adaptive size adjustment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flowchart of a picture compression method according to an embodiment of the present invention;
FIG. 2 is a flowchart illustrating another method for compressing pictures according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating an example of scaling data information according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a picture compression device according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of an information extraction unit provided in an embodiment of the present invention;
fig. 6 is a schematic structural diagram of an information adding unit according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another picture compression device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The image compression method provided by the embodiment of the invention can be applied to the compressed scene of the image with the format of 9.png, for example: when a scalable picture is compressed, a picture compression device that compresses the scalable picture from which the scaling data information is extracted and generates a compressed picture after compression, adds the scaling data information to a scene or the like in the picture information of the compressed picture, extracts scaling data information of the scalable picture. By adding the zooming data information into the picture information of the compressed picture again, the compressed picture retains the zooming data information, the integrity of the picture information in the process of lossy compression of the picture is ensured, the picture is ensured to be exported correctly, and meanwhile, the picture still has the function of self-adaptive size adjustment.
The image compression equipment related to the embodiment of the invention can be terminal equipment such as a computer, a tablet computer, a smart phone, a notebook computer, a palm computer and mobile internet equipment (MID); the scalable picture is specifically a picture in a format of.9. png.
The following describes the picture compression method provided by the embodiment of the present invention in detail with reference to fig. 1 and fig. 2.
Referring to fig. 1, a flow chart of a picture compression method according to an embodiment of the present invention is shown. As shown in fig. 1, the method of the embodiment of the present invention may include the following steps S101 to S103.
S101, when a scalable picture is compressed, extracting scaling data information of the scalable picture;
in particular, when scalable pictures are compressed, for example: when a scalable picture needs to be compressed, a picture compression device may extract scaling data information of the scalable picture, where the scaling data information may be used to indicate a partition of the scalable picture and a scaling of the partition, and it is understood that after the scaling data information is extracted, the picture information of the scalable picture will not include the scaling data information. It should be noted that the picture information of the scalable picture further includes binary data of the scalable picture, a picture size of the scalable picture, a picture occupied space size, and the like.
S102, compressing the scalable picture with the extracted scaling data information, and generating a compressed picture after compression;
specifically, the image compression device compresses the scalable image from which the zoom data information is extracted, and generates a compressed image after the compression, and further, the image compression device may compress the scalable image from which the zoom data information is extracted by using a preset compression method, and generates a compressed image in a compression Format corresponding to the preset compression method after the compression, where the preset compression method may be a compression method in a Portable network graphics Format (PNG), and the compression Format corresponding to the preset compression method may be a Format of PNG, and thus the Format of the compressed generated compressed image is a Format of PNG.
S103, adding the zooming data information to the picture information of the compressed picture;
specifically, when the compressed picture generated after compression is acquired, the picture compression device may add previously extracted zoom data information to the picture information of the compressed picture, where the picture information of the compressed picture further includes binary data of the compressed picture, a picture size of the compressed picture, a picture occupied space size, and the like. It will be appreciated that the picture format of the compressed picture to which the scaling data information is added will be changed to the format of.9. png, so that the compressed picture to which the scaling data information is added still has the function of adaptive resizing, while the picture footprint is reduced due to the compression of the scalable picture.
In the embodiment of the invention, the scaling data information of the scalable picture is extracted, the scalable picture after the scaling data information is extracted is compressed, and the scaling data information is added into the picture information of the compressed picture again, so that the compressed picture retains the scaling data information, the integrity of the picture information in the process of lossy compression of the picture is ensured, the picture is ensured to be correctly exported, and meanwhile, the picture still has the function of self-adaptive size adjustment.
Referring to fig. 2, a schematic flow chart of another picture compression method according to an embodiment of the invention is provided. As shown in fig. 2, the method of the embodiment of the present invention may include the following steps S201 to S205.
S201, when a scalable picture is compressed, searching a scaling data block of the scalable picture in picture information of the scalable picture;
in particular, when scalable pictures are compressed, for example: when a scalable picture needs to be compressed, the picture compression apparatus may search, in the picture information of the scalable picture, a scaling data block of the scalable picture, where the scaling data block is preferably an nptc (nine Patch chunk) data block.
S202, extracting the searched zooming data information in the zooming data block and storing the zooming data information;
specifically, after finding the scaling data block, the picture compressing apparatus may extract scaling data information in the found scaling data block, where the scaling data information may be used to indicate a partition of the scalable picture and a scaling ratio of the partition, and further, please refer to fig. 3 together, providing an exemplary diagram of scaling data information for an embodiment of the present invention, as shown in fig. 3, where the scaling data information indicates that the scalable picture is divided into 4 segments in the horizontal direction and 3 segments in the vertical direction, so that the scalable picture may be divided into 12 partitions, and also indicates a scaling ratio (F represents zoom and S represents zoom) of each partition, for example, the horizontal direction of the 0 th partition is stretched according to a scale of F0, and the vertical direction is shortened according to a scale of S2, by analogy, wherein F0, F1, F2 represent the proportional values of stretching and S0, S1, S2, S3 represent the proportional values of shortening, of course, the illustration in fig. 3 is merely exemplary. The picture compression device may store the extracted scaling data information, for example: store in cache, etc.
It is to be understood that the picture information of the scalable picture will not include the scaling data information after the scaling data information is extracted, i.e., the picture compression apparatus deletes the scaling data block in the picture information of the scalable picture after the scaling data information is extracted. It should be noted that the picture information of the scalable picture further includes binary data of the scalable picture, a picture size of the scalable picture, a picture occupied space size, and the like.
S203, compressing the scalable picture with the extracted scaling data information, and generating a compressed picture after compression;
specifically, the picture compression device compresses the scalable picture from which the zoom data information is extracted, and generates a compressed picture after the compression, and further, the picture compression device may compress the scalable picture from which the zoom data information is extracted by using a preset compression method, and generate a compressed picture in a compression format corresponding to the preset compression method after the compression, where the preset compression method may be a compression method of PNG, and the compression format corresponding to the preset compression method may be a format of PNG, and therefore the format of the compressed generated compressed picture is the format of PNG.
S204, creating a scaling data block of the compressed picture in the picture information of the compressed picture;
specifically, when the compressed picture generated after compression is acquired, the picture compression device may create a scaling data block of the compressed picture in picture information of the compressed picture, where the picture information of the compressed picture further includes binary data of the compressed picture, a picture size of the compressed picture, a picture occupied space size, and the like.
S205, adding the scaling data information into a scaling data block of the compressed picture;
specifically, the picture compression device adds the saved zoom data information to the created zoom data block of the compressed picture. It will be appreciated that the picture format of the compressed picture to which the scaling data information is added will be changed to the format of.9. png, so that the compressed picture to which the scaling data information is added still has the function of adaptive resizing, while the picture footprint is reduced due to the compression of the scalable picture.
In the embodiment of the invention, the scaling data information of the scalable picture is extracted, the scalable picture after the scaling data information is extracted is compressed, and the scaling data information is added into the picture information of the compressed picture again, so that the compressed picture retains the scaling data information, the integrity of the picture information in the process of lossy compression of the picture is ensured, the picture is ensured to be correctly exported, and meanwhile, the occupied space of the picture is reduced on the basis of ensuring that the picture still has the function of self-adaptive size adjustment, and the performance of the system is further improved.
The following describes a picture compression apparatus according to an embodiment of the present invention in detail with reference to fig. 4 to 6. It should be noted that, the picture compression apparatus shown in fig. 4-6 is used for executing the method of the embodiment shown in fig. 1 and 2 of the present invention, and for convenience of description, only the portion related to the embodiment of the present invention is shown, and details of the specific technology are not disclosed, please refer to the embodiment shown in fig. 1 and 2 of the present invention.
Referring to fig. 4, a schematic structural diagram of a picture compression device according to an embodiment of the present invention is provided. As shown in fig. 4, the picture compression apparatus 1 according to an embodiment of the present invention may include: an information extraction unit 11, a compression unit 12, and an information addition unit 13.
An information extraction unit 11 for extracting scaling data information of a scalable picture when the scalable picture is compressed;
in particular implementations, when a scalable picture is compressed, for example: when a scalable picture needs to be compressed, the information extraction unit 11 may extract scaling data information of the scalable picture, where the scaling data information may be used to indicate a partition of the scalable picture and a scaling of the partition, and it is understood that after the scaling data information is extracted, the picture information of the scalable picture will not include the scaling data information. It should be noted that the picture information of the scalable picture further includes binary data of the scalable picture, a picture size of the scalable picture, a picture occupied space size, and the like.
Specifically, please refer to fig. 5, which provides a schematic structural diagram of an information extraction unit according to an embodiment of the present invention. As shown in fig. 5, the information extracting unit 11 may include:
a data block search subunit 111, configured to, when a scalable picture is compressed, search for a scaled data block of the scalable picture in picture information of the scalable picture;
in particular implementations, when a scalable picture is compressed, for example: when a scalable picture needs to be compressed, the data block searching sub-unit 111 may search for a scaling data block of the scalable picture in the picture information of the scalable picture, where the scaling data block is preferably an NPTC data block.
An information saving subunit 112, configured to extract the searched scaling data information in the scaling data block, and save the scaling data information;
in a specific implementation, after the data block searching subunit 111 finds the scaled data block, the information saving subunit 112 may extract scaled data information in the found scaled data block, where the scaled data information may be used to indicate the partition of the scalable picture and the scaling of the partition, and further, please refer to fig. 3 together, an exemplary diagram of scaled data information is provided for the embodiment of the present invention, as shown in fig. 3, where the scaled data information indicates that the scalable picture is divided into 4 segments in the horizontal direction and 3 segments in the vertical direction, so that the scalable picture may be divided into 12 partitions, and also indicates the scaling of each block (F indicates zoom and S indicates zoom), for example, the horizontal direction of the 0 th partition is stretched according to the scaling of F0, the vertical direction is shortened according to the proportion of S2, and so on, wherein F0, F1 and F2 represent the stretching proportion values, and S0, S1, S2 and S3 represent the shortening proportion values, and the illustration in FIG. 3 is only an example. The information saving subunit 112 may save the extracted scaling data information, for example: store in cache, etc.
It is to be understood that the picture information of the scalable picture will not include the scaling data information after the scaling data information is extracted, i.e., the picture compression apparatus deletes the scaling data block in the picture information of the scalable picture after the scaling data information is extracted. It should be noted that the picture information of the scalable picture further includes binary data of the scalable picture, a picture size of the scalable picture, a picture occupied space size, and the like.
A compression unit 12 for compressing the scalable picture from which the scaling data information is extracted, and generating a compressed picture after the compression;
in a specific implementation, the compressing unit 12 compresses the scalable picture from which the zoom data information is extracted, and generates a compressed picture after the compression, and further, the compressing unit 12 may compress the scalable picture from which the zoom data information is extracted by using a preset compression method, and generate a compressed picture in a compression format corresponding to the preset compression method after the compression, where the preset compression method may be a PNG compression method, and the compression format corresponding to the preset compression method may be a PNG format, and therefore the compressed generated compressed picture is in the PNG format.
An information adding unit 13 configured to add the zoom data information to the picture information of the compressed picture;
in a specific implementation, when the compressed picture generated after compression is acquired, the information adding unit 13 may add previously extracted zoom data information to the picture information of the compressed picture, where the picture information of the compressed picture further includes binary data of the compressed picture, a picture size of the compressed picture, a picture occupied space size, and the like. It will be appreciated that the picture format of the compressed picture to which the scaling data information is added will be changed to the format of.9. png, so that the compressed picture to which the scaling data information is added still has the function of adaptive resizing, while the picture footprint is reduced due to the compression of the scalable picture.
Specifically, please refer to fig. 6, which provides a schematic structural diagram of an information adding unit according to an embodiment of the present invention. As shown in fig. 6, the information adding unit 13 may include:
a data block creation subunit 131, configured to create a scaled data block of the compressed picture in picture information of the compressed picture;
in a specific implementation, when the compressed picture generated after compression is acquired, the data block creating subunit 131 may create a scaling data block of the compressed picture in picture information of the compressed picture, where the picture information of the compressed picture further includes binary data of the compressed picture, a picture size of the compressed picture, a size of a picture occupied space, and the like.
An information adding subunit 132, configured to add the scaling data information to the scaling data block of the compressed picture;
in a specific implementation, the information adding subunit 132 adds the scaling data information saved by the information saving subunit 112 to the created scaling data block of the compressed picture. It will be appreciated that the picture format of the compressed picture to which the scaling data information is added will be changed to the format of.9. png, so that the compressed picture to which the scaling data information is added still has the function of adaptive resizing, while the picture footprint is reduced due to the compression of the scalable picture.
In the embodiment of the invention, the scaling data information of the scalable picture is extracted, the scalable picture after the scaling data information is extracted is compressed, and the scaling data information is added into the picture information of the compressed picture again, so that the compressed picture retains the scaling data information, the integrity of the picture information in the process of lossy compression of the picture is ensured, the picture is ensured to be correctly exported, and meanwhile, the occupied space of the picture is reduced on the basis of ensuring that the picture still has the function of self-adaptive size adjustment, and the performance of the system is further improved.
Referring to fig. 7, a schematic structural diagram of another picture compression device according to an embodiment of the present invention is provided. As shown in fig. 7, the picture compression apparatus 1000 may include: at least one processor 1001, such as a CPU, at least one network interface 1004, a user interface 1003, memory 1005, at least one communication bus 1002. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display) and a Keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a standard wireless interface. The network interface 1004 may optionally include a standard wired interface, a wireless interface (e.g., WI-FI interface). The memory 1005 may be a high-speed RAM memory or a non-volatile memory (non-volatile memory), such as at least one disk memory. The memory 1005 may optionally be at least one memory device located remotely from the processor 1001. As shown in fig. 7, a memory 1005, which is a kind of computer storage medium, may include therein an operating system, a network communication module, a user interface module, and a picture compression application program.
In the picture compression apparatus 1000 shown in fig. 7, the user interface 1003 is mainly used as an interface for providing input for a user, and acquiring data output by the user; the processor 1001 may be configured to call the picture compression application stored in the memory 1005, and specifically perform the following steps:
extracting scaling data information of a scalable picture when the scalable picture is compressed;
compressing the scalable picture from which the scaling data information is extracted, and generating a compressed picture after the compression;
and adding the scaling data information to the picture information of the compressed picture.
In one embodiment, the processor 1001, when performing the separation processing on the scalable picture and the scaling data information of the scalable picture, specifically performs the following steps:
searching a scaling data block of the scalable picture in picture information of the scalable picture;
and extracting the searched zooming data information in the zooming data block and storing the zooming data information.
In one embodiment, when the processor 1001 performs compression on the scalable picture from which the scaling data information is extracted and generates a compressed picture after the compression, the following steps are specifically performed:
and compressing the scalable picture with the extracted scaling data information by adopting a preset compression mode, and generating a compressed picture in a compression format corresponding to the preset compression mode after compression.
In one embodiment, the preset compression mode is a compression mode of a portable network graphics format PNG.
In one embodiment, when the processor 1001 adds the scaling data information to the picture information of the compressed picture, it specifically performs the following steps:
creating a scaling data block of the compressed picture in picture information of the compressed picture;
adding the scaling data information to a scaling data block of the compressed picture.
In one embodiment, the scaling data information is used to indicate the partition of the scalable picture and the scaling of the partition.
In the embodiment of the invention, the scaling data information of the scalable picture is extracted, the scalable picture after the scaling data information is extracted is compressed, and the scaling data information is added into the picture information of the compressed picture again, so that the compressed picture retains the scaling data information, the integrity of the picture information in the process of lossy compression of the picture is ensured, the picture is ensured to be correctly exported, and meanwhile, the occupied space of the picture is reduced on the basis of ensuring that the picture still has the function of self-adaptive size adjustment, and the performance of the system is further improved.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention, and it is therefore to be understood that the invention is not limited by the scope of the appended claims.
Claims (12)
1. A picture compression method, comprising:
when a scalable picture is compressed, extracting scaling data information of the scalable picture, the scaling data information indicating a partition of the scalable picture and a scaling of the partition;
compressing the scalable picture from which the scaling data information is extracted, and generating a compressed picture after the compression;
and adding the scaling data information to the picture information of the compressed picture.
2. The method according to claim 1, wherein said extracting the scaling data information of the scalable picture performs a separation process on the scalable picture and the scaling data information of the scalable picture, comprising:
searching a scaling data block of the scalable picture in picture information of the scalable picture;
and extracting the searched zooming data information in the zooming data block and storing the zooming data information.
3. The method according to claim 1, wherein compressing the scalable picture from which the scaling data information is extracted and generating a compressed picture after the compressing comprises:
and compressing the scalable picture with the extracted scaling data information by adopting a preset compression mode, and generating a compressed picture in a compression format corresponding to the preset compression mode after compression.
4. The method of claim 3, wherein the predetermined compression mode is a compression mode of a portable network graphics format (PNG).
5. The method according to claim 1, wherein the adding the scaling data information to the picture information of the compressed picture comprises:
creating a scaling data block of the compressed picture in picture information of the compressed picture;
adding the scaling data information to a scaling data block of the compressed picture.
6. A picture compression device, comprising:
an information extraction unit configured to extract, when a scalable picture is compressed, scaling data information of the scalable picture, the scaling data information indicating a partition of the scalable picture and a scaling of the partition;
a compression unit configured to compress the scalable picture from which the scaling data information is extracted, and generate a compressed picture after the compression;
an information adding unit, configured to add the scaling data information to the picture information of the compressed picture.
7. The apparatus according to claim 6, wherein the information extraction unit comprises:
a data block search subunit operable to, when a scalable picture is compressed, search for a scalable data block of the scalable picture in picture information of the scalable picture;
and the information storage subunit is used for extracting the searched zooming data information in the zooming data block and storing the zooming data information.
8. The apparatus according to claim 6, wherein the compressing unit is specifically configured to compress the scalable picture from which the scaling data information is extracted by using a preset compression method, and generate a compressed picture in a compression format corresponding to the preset compression method after compression.
9. The apparatus of claim 8, wherein the predetermined compression is a compression of a PNG.
10. The apparatus according to claim 6, wherein the information adding unit includes:
a data block creation subunit configured to create a scaled data block of the compressed picture in picture information of the compressed picture;
an information adding subunit, configured to add the scaling data information to a scaling data block of the compressed picture.
11. An image compression apparatus comprising a processor and a memory;
the memory is configured to store a picture compression application, and the processor is configured to invoke the picture compression application stored in the memory to perform the method of any of claims 1-5.
12. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program which, when executed by a processor, performs the method according to any one of claims 1-5.
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