CN106651972A - Binary image coding and decoding methods and devices - Google Patents
Binary image coding and decoding methods and devices Download PDFInfo
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- CN106651972A CN106651972A CN201510740338.5A CN201510740338A CN106651972A CN 106651972 A CN106651972 A CN 106651972A CN 201510740338 A CN201510740338 A CN 201510740338A CN 106651972 A CN106651972 A CN 106651972A
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Abstract
Embodiments of the invention disclose binary image coding and decoding methods and devices and relate to the technical field of image coding and decoding. The coding method comprises steps of obtaining a to-be-coded binary image; obtaining a coding table TL corresponding to a coding length L from a preset coding table database according to the preset coding lengths L; according to a preset pixel point grouping sequence, grouping pixel points included in the to-be-coded binary image; according to the pixel values of the pixel points in each pixel point group after grouping, calculating indexes of corresponding coding elements in the coding table TL of the pixel point group; according to the indexes of the coding elements obtained by calculation, obtaining values of corresponding coding elements in the coding table TL of each pixel point group in the coding table TL; and according to the obtained values of the coding elements, generating coding data corresponding to the to-be-coded binary image. With the scheme provided by the embodiments of the invention, the binary image is coded and then the storage space of the binary image is reduced.
Description
Technical field
The present invention relates to image encoding and decoding technique field, more particularly to a kind of bi-level image coding, coding/decoding method
And device.
Background technology
Recently as the fast development of computer technology, computer vision has obtained more and more extensively applying,
And conventional computer vision application would generally be related to character recognition technologies, it is the accuracy rate for improving character recognition,
Generally need to utilize a large amount of bianry image samples to be trained the grader for character recognition.
Further, typically stored with the conventional picture format such as BMP as the bianry image of sample, with
Sample image increasing number, the quantity of bianry image sample may reach it is ten hundreds of, it is ten hundreds of
The memory space that bianry image sample takes is very big, is not easy to user's use.
The content of the invention
The embodiment of the invention discloses a kind of bi-level image coding, coding/decoding method and device, to reduce binary map
As the memory space for taking.
To reach above-mentioned purpose, the embodiment of the invention discloses a kind of bi-level image coding method, methods described
Including：
Obtain bianry image to be encoded；
According to default code length L, the code length L correspondences are obtained from default coding schedule data base
Coding schedule TL, wherein, the coding schedule TLFor recording the index of code element and the value of code element
Between corresponding relation, the coding schedule TLIn include 2LThe different code element of individual value, each code element
Value be [0,2L- 1] integer in；
According to default pixel order of packets, the pixel included by the bianry image to be encoded is carried out
Packet, wherein, after packet, included in each pixel packet, the quantity of pixel is identical, and no more than institute
State code length L；
According to the pixel value of pixel included in each pixel packet after packet, calculate the pixel and be grouped
In the coding schedule TLIn corresponding code element index；
According to the index of calculated code element, from the coding schedule TLMiddle each pixel that obtains is grouped
In the coding schedule TLIn corresponding code element value；
According to the value of the code element for being obtained, the corresponding coded data of the bianry image to be encoded is generated.
It is in a specific embodiment of the present invention, described to be wrapped in each pixel packet according to after packet
Pixel value containing pixel, calculates the pixel and is grouped in the coding schedule TLIn corresponding code element rope
Draw, including：
For arbitrary pixel is grouped G after packet, according to following formula, calculate the pixel packet G and exist
The coding schedule TLIn corresponding code element index indexG,
Wherein, t represents the order of the pixel in pixel packet G of putting in order according to default pixel
Number, itRepresent pixel value of the serial number for the pixel of t in pixel packet G.
In a specific embodiment of the present invention, the value according to the code element for being obtained is raw
Into the corresponding coded data of the bianry image to be encoded, including：
Obtain the image information of the image to be encoded；
According to the image information for being obtained and the value of the code element for being obtained, according to default information arrangement
Rule, generates the corresponding coded data of the bianry image to be encoded.
In a specific embodiment of the present invention, described according to described image information and the volume that obtained
The value of data code, according to default information arrangement rule, generates the corresponding volume of the bianry image to be encoded
After code data, also include：
The coded data for being generated is stored to default image storage file tail, wherein, the default figure
As storage file is used to store the corresponding coded data of at least one bianry image.
It is in a specific embodiment of the present invention, described according to the image information that obtained and to be obtained
The value of code element, according to default information arrangement rule, generates the bianry image to be encoded corresponding
Coded data, including：
According to following information arrangement rule, the corresponding coded data of the bianry image to be encoded is generated,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
In a specific embodiment of the present invention, the bi-level image coding method also includes：
The data modification instruction for the default image storage file is received, wherein, the data modification
At least include in instruction：The mark of bianry image to be modified, the mark of image information to be modified and to be modified
The modified values of image information；
The mark of the bianry image described to be modified included according to data modification instruction, described default
Image storage file in search the corresponding coded data of the bianry image to be modified；
The mark of image information described to be modified that included according to data modification instruction and described to be repaired
Change the modified values of image information, change the coded data for finding.
To reach above-mentioned purpose, the embodiment of the invention discloses a kind of bianry image coding/decoding method, methods described
Including：
Obtain the coded data of bianry image to be decoded；
According to default code length L, the coded data is parsed, and then obtain described to be decoded two
Each pixel of value image is grouped the value of corresponding code element, wherein, pixel is grouped into：According to
Default pixel order of packets, carries out packet to the pixel included by the bianry image to be decoded and obtains
, included in each pixel packet, the quantity of pixel is identical, and no more than described default coding length
Degree L；
According to the default code length L, the code length L is obtained from default decoding table data base
Corresponding decoding table TL', wherein, the decoding table TL' for recording the value of code element and the rope of code element
Corresponding relation between drawing, the coding schedule TL' in include 2LThe different code element of individual value, each coding unit
The value of element is [0,2L- 1] integer in；
According to the value of the code element for being obtained, from the decoding table TL' in obtain each pixel be grouped in institute
State decoding table TL' in corresponding code element index；
According to the index of the code element for being obtained, the pixel that each pixel is grouped included pixel is obtained
Value；
According to the pixel value for being obtained, the bianry image to be decoded is generated.
In a specific embodiment of the present invention, the index according to the code element for being obtained is obtained
The pixel value that each pixel is grouped included pixel is obtained, including：
For the index index of the arbitrary code element for being obtainedD, the index is obtained according to following steps
ndexDCorresponding pixel is grouped GDThe pixel value of included pixel：
Determine the index indexDBinary numeral；
According to btValue and the code length L, obtain the pixel and be grouped GDAccording to default picture
Vegetarian refreshments puts in order serial number for the pixel value i of the pixel of tt, wherein, btRepresent in the binary numeral from
Low level is designated the value of the bit of t, the index to a high position
In a specific embodiment of the present invention, the coded data for obtaining bianry image to be decoded,
Including：
According to the mark of bianry image to be decoded, described to be decoded two are obtained from default image storage file
The coded data of value image, wherein, the default image storage file is used to store at least one binary map
As corresponding coded data.
In a specific embodiment of the present invention, the coded data of the bianry image to be decoded is：Press
According to the regularly arranged coded data of following information arrangement,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
To reach above-mentioned purpose, the embodiment of the invention discloses a kind of bi-level image coding device, described device
Including：
Image obtains module, for obtaining bianry image to be encoded；
Coding schedule obtains module, for according to default code length L, obtaining from default coding schedule data base
Obtain the corresponding coding schedule T of the code length LL, wherein, the coding schedule TLFor recording the rope of code element
Draw the corresponding relation and the value of code element between, the coding schedule TLIn include 2LThe different coding of individual value
Element, the value of each code element is [0,2L- 1] integer in；
Pixel grouping module, for according to default pixel order of packets, to the binary map to be encoded
As the pixel for being included is grouped, wherein, pixel included in each pixel packet after packet
Quantity is identical, and no more than described code length L；
Index computing module, for the pixel value according to pixel included in each pixel packet after packet,
Calculate the pixel and be grouped in the coding schedule TLIn corresponding code element index；
First value obtains module, for the index according to calculated code element, from the coding schedule
TLMiddle each pixel of acquisition is grouped in the coding schedule TLIn corresponding code element value；
Coded data generation module, for the value according to the code element for being obtained, generates described to be encoded
The corresponding coded data of bianry image.
In a specific embodiment of the present invention, the index computing module, specifically for for packet
Arbitrary pixel is grouped G afterwards, according to following formula, calculates the pixel and is grouped G in the coding schedule TL
In corresponding code element index indexG,
Wherein, t represents the order of the pixel in pixel packet G of putting in order according to default pixel
Number, itRepresent pixel value of the serial number for the pixel of t in pixel packet G.
In a specific embodiment of the present invention, the coded data generation module, including：
Image information obtains submodule, for obtaining the image information of the image to be encoded；
Coded data obtains submodule, for according to the image information for being obtained and the code element for being obtained
Value, according to default information arrangement rule, generates the corresponding coded data of the bianry image to be encoded.
In a specific embodiment of the present invention, the bi-level image coding device also includes：
Coded data memory module, after generating coded data in the coded data generation module, will
The coded data for being generated is stored to default image storage file tail, wherein, the default image storage
File is used to store the corresponding coded data of at least one bianry image.
In a specific embodiment of the present invention, the coded data obtains submodule, specifically for pressing
According to following information arrangement rule, the corresponding coded data of the bianry image to be encoded is generated,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
In a specific embodiment of the present invention, the bi-level image coding device also includes：
Data modification command reception module, the data for receiving for the default image storage file are repaiied
Change instruction, wherein, at least include in the data modification instruction：It is the mark of bianry image to be modified, to be repaired
Change the modified values of the mark and image information to be modified of image information；
Coded data searching modul, for the two-value described to be modified included according to data modification instruction
The mark of image, searches the corresponding volume of the bianry image to be modified in the default image storage file
Code data；
Coded data modified module, for the image described to be modified included according to data modification instruction
The modified values of the mark of information and the image information to be modified, change the coded data for finding.
To reach above-mentioned purpose, the embodiment of the invention discloses a kind of bianry image decoding apparatus, described device
Including：
Coded data obtains module, for obtaining the coded data of bianry image to be decoded；
Second value obtains module, for according to default code length L, parsing to the coded data,
And then the value that each pixel of the bianry image to be decoded is grouped corresponding code element is obtained, wherein,
Pixel is grouped into：According to default pixel order of packets, the bianry image to be decoded is included
Pixel carries out being grouped what is obtained, and included in each pixel packet, the quantity of pixel is identical, and less
In the default code length L；
Decoding table obtains module, for according to the default code length L, from default decoding table data base
It is middle to obtain the corresponding decoding table T of the code length LL', wherein, the decoding table TL' for recording code element
Value and the index of code element between corresponding relation, the coding schedule TL' in include 2LIndividual value is different
Code element, the value of each code element is [0,2L- 1] integer in；
Index obtains module, for the value according to the code element for being obtained, from the decoding table TL' middle acquisition
Each pixel is grouped in the decoding table TL' in corresponding code element index；
Pixel value obtains module, for the index according to the code element for being obtained, obtains each pixel point
The pixel value of the included pixel of group；
Image generation module, for according to the pixel value for being obtained, generating the bianry image to be decoded.
In a specific embodiment of the present invention, the pixel value obtains module, specifically for obtaining institute
The index index of the arbitrary code element for obtainingDCorresponding pixel is grouped GDThe pixel value of included pixel；
Wherein, the pixel value obtains module, including：
Numerical value determination sub-module, for determining the index indexDBinary numeral；
Pixel value obtains submodule, for according to btValue and the code length L, obtain the pixel
Point packet GDAccording to default pixel put in order serial number be t pixel pixel value it, wherein,
btThe value of the bit of t, the index are designated in representing the binary numeral from low level to a high position
In a specific embodiment of the present invention, the coded data obtains module, specifically for basis
The mark of bianry image to be decoded, obtains the bianry image to be decoded from default image storage file
Coded data, wherein, it is corresponding that the default image storage file is used at least one bianry image of storage
Coded data.
In a specific embodiment of the present invention, the coded data of the bianry image to be decoded is：Press
According to the regularly arranged coded data of following information arrangement,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
As seen from the above, in scheme provided in an embodiment of the present invention, after obtaining bianry image to be encoded, according to
Default code length L, obtains the corresponding coding schedule T of code length L from default coding schedule data baseL,
According to default pixel order of packets, the pixel included by bianry image to be encoded is grouped, root
According to the pixel value of pixel included in each pixel packet after packet, calculate the pixel and be grouped in coding
Table TLIn corresponding code element index, according to the index of calculated code element, from coding schedule TL
Middle each pixel of acquisition is grouped in coding schedule TLIn corresponding code element value, according to the volume for being obtained
The value of data code, generates the corresponding coded data of bianry image to be encoded.As can be seen that one by more than
One code element of multiple pixel correspondences included in pixel packet, therefore, according to the embodiment of the present invention
After the scheme of offer is to bi-level image coding to be encoded, the memory space that the coded data for obtaining takes will be much
Less than the memory space that bianry image to be encoded takes.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to implementing
Example or accompanying drawing to be used needed for description of the prior art are briefly described, it should be apparent that, describe below
In accompanying drawing be only some embodiments of the present invention, for those of ordinary skill in the art, do not paying
On the premise of going out creative work, can be with according to these other accompanying drawings of accompanying drawings acquisition.
Fig. 1 is a kind of schematic flow sheet of bi-level image coding method provided in an embodiment of the present invention；
Fig. 2 is the schematic flow sheet of another kind of bi-level image coding method provided in an embodiment of the present invention；
Fig. 3 is a kind of schematic flow sheet of bianry image coding/decoding method provided in an embodiment of the present invention；
Fig. 4 is a kind of structural representation of bi-level image coding device provided in an embodiment of the present invention；
Fig. 5 is the structural representation of another kind of bi-level image coding device provided in an embodiment of the present invention；
Fig. 6 is a kind of structural representation of bianry image decoding apparatus provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of the every other embodiment that obtained, belong to the scope of protection of the invention.
Fig. 1 is a kind of schematic flow sheet of bi-level image coding method provided in an embodiment of the present invention, the method bag
Include：
S101：Obtain bianry image to be encoded.
Bianry image can be understood as the only image comprising black pixel point and white pixel point.The picture of pixel
Plain value is relevant with the variable digit for representing the variable of pixel pixel value that developer sets.
For example, if the variable digit of the variable for representing pixel pixel value is 1bit, usual black picture element
The pixel value of point is " 0 ", and to be represented in binary as " 0 ", and the pixel value of white pixel point is " 1 ", with
It is represented in binary as " 1 "；
If the variable digit of the variable for representing pixel pixel value is 8bit, the picture of usual black pixel point
Element value is " 0 ", and to be represented in binary as " 00000000 ", and the pixel value of white pixel point is " 255 ",
To be represented in binary as " 11111111 "；
The variable digit of the variable for being certainly used for representing pixel pixel value can also be other values, situation with it is upper
State situation to be similar to, will not enumerate here.
S102：According to default code length L, code length L pair is obtained from default coding schedule data base
The coding schedule T for answeringL。
Wherein, coding schedule TLFor recording the corresponding pass between the index of code element and the value of code element
System, includes 2 in the coding scheduleLThe different code element of individual value, the value of each code element is [0,2L-1]
An interior integer.
Default code length can be understood as the digit for the variable of code element in presentation code table.Tool
When encoding to bianry image to be encoded of body, can be according to the situation of bianry image to be encoded and to pressure
The factors such as the requirement of contracting ratio adjust default code length.The value of default code length L is bigger, using this
When the scheme that inventive embodiments are provided carries out picture coding, the compression ratio of the coded data for obtaining is higher.
With reference to concrete practical situations, used in development process, 8bit integer variables are more, so at this
L≤8 in a kind of bright relatively good implementation, further, it is contemplated that need in subsequent step to two-value to be encoded
The pixel of image carries out pixel packet transaction, and default code length is determined according to following formula
Value：
W/L=integers.
Based on foregoing description, the corresponding coding schedule T of default code length L are being generatedLWhen, it may be considered that it is based on
Ascii character generates the coding schedule.
S103：According to default pixel order of packets, the pixel included to bianry image to be encoded is clicked through
Row packet.
Wherein, default pixel order of packets can be according to pixel column order from left to right, according to picture
Element row order from right to left, according to pixel column order from top to bottom, according to pixel column from top to bottom suitable
Sequence etc., the application are not defined to this.
Specifically, after packet, included in each pixel packet, the quantity of pixel is identical, and on being not more than
State code length L, preferably, after packet included in the packet of each pixel the quantity of pixel be equal to it is above-mentioned
Code length L, so can obtain the compression ratio of maximum in the case where code length is fixed.
It should be understood that when being grouped to the pixel included by bianry image to be encoded, can be potentially encountered
The pixel that the quantity of the pixel included in last pixel packet is included in being grouped with other pixels
The different situation of quantity, at this moment can not carry out any process to last pixel packet, directly after
Continuous subsequent step, naturally it is also possible to which pixel is carried out to last pixel packet according to default pixel
Polishing process, for example, default pixel can be last pixel of bianry image to be encoded etc.,
Then again to the pixel supplemented during polishing is processed is abandoned during the decoding data after coding, the application is not
This is defined.
S104：According to the pixel value of pixel included in each pixel packet after packet, the pixel is calculated
Point is grouped in coding schedule TLIn corresponding code element index.
In a kind of optional implementation of the present invention, for after packet, arbitrary pixel is grouped G, can be according to
Following formula, calculates pixel and is grouped G in coding schedule TLIn corresponding code element index indexG,
Wherein, t represent according to default pixel put in order pixel packet G in pixel serial number, it
Pixel value of the serial number for the pixel of t in expression pixel packet G.
it<<T is represented itBinary numeral move to right t positions。
It is assumed that itRepresented with 1 bit, then itValue may be 0 or 1, L be equal to 3, then
It should be noted that above-mentioned itPixel value of the serial number for the pixel of t in expression pixel packet G, can
Being the pixel value of the pixel for directly reading from bianry image to be encoded, it is understood that to be according to straight
The pixel value that the pixel value conversion of the pixel for reading is obtained is connect from bianry image to be encoded, for example, directly
The pixel value of the pixel read from bianry image to be encoded is 255, and which is represented in binary as " 11111111 ",
Then now itCan, the pixel of the pixel that directly to be encoded bianry image read similar with value as 1
It is worth for 0, which is represented in binary as " 00000000 ", then now itCan be with value as 0.
In addition, above-mentioned default pixel puts in order can be and aforementioned default pixel order of packets phase
What is closed puts in order, for example, default pixel order of packets be according to pixel column order from left to right with
And the sequential packet according to pixel column from top to bottom, then put in order can be for same picture for default pixel
Pixel in plain row is arranged according to order from left to right, for the pixel between different pixels row, is pressed
According to order arrangement from top to bottom etc..
S105：According to the index of calculated code element, from coding schedule TLMiddle acquisition each pixel point
Group is in coding schedule TLIn corresponding code element value.
S106：According to the value of the code element for being obtained, the corresponding coded number of bianry image to be encoded is generated
According to.
It should be noted that the coded data generated in this step can be understood as depositing with particular file format
The coded data of storage, it is understood that for not with particular file format data storage string.
In a specific embodiment of the present invention, except obtained coding need to be considered when generating coded data
Outside the value of element, it is also contemplated that the mark of bianry image to be encoded, width, height, type, image
Whether it is effective image etc. image information, the image of these bianry images to be encoded is added in coded data
After information, the later stage is can aid in using bianry image to be encoded, the application does not limit the tool of image information
The body form of expression.
Specifically, the value according to the code element for being obtained, generates the corresponding coding of bianry image to be encoded
During data, it is possible to obtain the image information of image to be encoded, and according to the image information for being obtained and obtained
Code element value, according to default information arrangement rule, generate the corresponding volume of bianry image to be encoded
Code data.
After generating coded data in the manner described above, if being not desired to the coded data used in later stage use,
Can will represent in image information that whether image is that the flag of effective image is set to engineering noise state, and
Without the need for the coded data is deleted, when can using the coded data, then image will be represented in image information
Be whether that the flag of effective image is set to " effective " state, user is so facilitated to coded data
Management.
Optionally, according to the image information for being obtained and the value of the code element for being obtained, according to default
Information arrangement rule, when generating the corresponding coded data of bianry image to be encoded, can arrange according to following information
Row rule, generates the corresponding coded data of bianry image to be encoded,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
Optionally, Id1Can be character " $ ", Id2Can be character "@", it is of course possible to be other values, this
Application is not defined to this.
During according to the value composition data string of the code element for being obtained, simply will can be obtained in order
The code element for obtaining is arranged together.
For example, the coded data for generating in the manner described above can be with as follows：
$@ID@W@H@L@type@valid@inf:C0C1…Clen-1
Wherein, C0C1…Clen-1As above-mentioned E.
After encoding to bianry image using scheme provided in an embodiment of the present invention, its coded data is only logical
Could normally to user's exhibition after crossing the coding/decoding method decoding corresponding with coded method provided in an embodiment of the present invention
Show, therefore, the bianry image after warp knit code has higher safety.
As seen from the above, in the scheme that the present embodiment is provided, after obtaining bianry image to be encoded, according to default
Code length L, the corresponding coding schedule T of code length L are obtained from default coding schedule data baseL, according to
Default pixel order of packets, is grouped to the pixel included by bianry image to be encoded, according to point
After group included in the packet of each pixel pixel pixel value, calculate the pixel and be grouped in coding schedule TL
In corresponding code element index, according to the index of calculated code element, from coding schedule TLIn obtain
Obtain each pixel and be grouped in coding schedule TLIn corresponding code element value, according to obtained coding unit
The value of element, generates the corresponding coded data of bianry image to be encoded.As can be seen that a pixel by more than
One code element of multiple pixel correspondences included in point packet, therefore, according to the side that the present embodiment is provided
After case is to bi-level image coding to be encoded, the memory space that the coded data for obtaining takes far smaller than will be waited to compile
The memory space that code bianry image takes.
Those skilled in the art are it should be understood that the substantial amounts of bianry image sample of normal conditions is to classification
When device is trained, the quantity of bianry image sample may reach tens of thousands of or even hundreds of thousands, if these files
Store in the form of single file, for embedded system, loading these files needs to process a large amount of
I/O operation, be nearly impossible.In view of the foregoing, in a kind of relatively good implementation of the present invention,
Referring to Fig. 2, there is provided the schematic flow sheet of another kind of bi-level image coding method, compared with previous embodiment,
In the present embodiment, in the value according to image information and the code element for being obtained, arrange according to default information
Row rule, after generating the corresponding coded data of bianry image to be encoded, also includes：
S107：The coded data for being generated is stored to default image storage file tail.
Wherein, default image storage file is used to store the corresponding coded data of at least one bianry image.
The coded data for being generated is stored to the situation of default image storage file tail based on above-mentioned, at this
In a kind of specific implementation of invention, above-mentioned bi-level image coding method can also include：
The data modification instruction for default image storage file is received, wherein, in data modification instruction extremely
Include less：The mark of bianry image to be modified, the mark of image information to be modified and image information to be modified
Modified values；
The mark of the bianry image to be modified included according to data modification instruction, in default image storage text
The corresponding coded data of bianry image to be modified is searched in part；
The mark and image information to be modified of the image information to be modified included according to data modification instruction
Modified values, change the coded data for finding.
It is by description above it is recognised that various image informations can be included in coded data, not another here
One enumerates.
With image information it is below：Whether image is to illustrate as a example by effective image.
Receive mark and the mark that whether the mark comprising bianry image to be modified, image are effective image
After the data modification instruction of the modified values of knowledge, first deposited from default image according to the mark of bianry image to be modified
The coded data of the bianry image is found in storage file, then whether image is positioned from the coded data for finding
For the mark of effective image, and change the value of the mark.
In practical application, if wanting from default image storage file to delete the coded data of a certain bianry image,
Can be realized by changing the value, so without the need for the coded data for really deleting bianry image, when user sends out
When now still wanting to using the bianry image, only need to change the bianry image it is above-mentioned be whether effective image mark
Value, without the need for going again to find the view data of the bianry image elsewhere, without again toward default
Image storage file in add the coded data of the bianry image, the substantial amounts of two-value of user management can be facilitated
The coded data of image.
As seen from the above, in the scheme that the present embodiment is provided, the coded data for being generated is stored to default
Image storage file tail, and the corresponding coding of multiple bianry images in default image storage file, can be stored
Data, then when needing to load multiple files, only need to load the default image storage file, it is clear that
I/O operation is reduced to by multiple I/O operation, is needing loading many using scheme provided in an embodiment of the present invention
The number of times of I/O operation in the case of individual file, can be greatly reduced.
Corresponding with above-mentioned bi-level image coding method, the embodiment of the present invention additionally provides a kind of bianry image solution
Code method.
Fig. 3 is a kind of schematic flow sheet of bianry image coding/decoding method provided in an embodiment of the present invention, the method bag
Include：
S301：Obtain the coded data of bianry image to be decoded.
In a kind of specific implementation, can directly from the corresponding single coding file of bianry image to be decoded
Obtain the coded data of the bianry image.
In another kind of specific implementation, can be with the mark according to bianry image to be decoded, from default figure
Coded data as bianry image to be decoded is obtained in storage file, wherein, default image storage file is used
In the corresponding coded data of at least one bianry image of storage.
In this case, the corresponding coded data of multiple bianry images is stored in one file, practical application
In when needing to load multiple bianry images, only load a file, reduce the number of times of I/O operation.
S302：According to default code length L, coded data is parsed, and then obtain two-value to be decoded
Each pixel of image is grouped the value of corresponding code element.
Wherein, default code length can be understood as the position for the variable of code element in presentation code table
Number, the parameter are set in an encoding process.When specifically encoding to bianry image to be decoded,
Can be according to the default coding length of the factor such as the situation of bianry image to be decoded and the requirement to compression ratio adjustment
Degree.The value of default code length L is bigger, carries out picture coding using scheme provided in an embodiment of the present invention
When, the compression ratio of the coded data for obtaining is higher.
In addition, pixel packet is also what is carried out in an encoding process, specifically, pixel is grouped into：Press
According to default pixel order of packets, the pixel included to bianry image to be decoded carries out being grouped what is obtained,
Included in each pixel packet, the quantity of pixel is identical, and no more than default code length L.
S303：According to default code length L, code length L pair is obtained from default decoding table data base
The decoding table T for answeringL'。
Wherein, decoding table TL' be used to record the corresponding pass between the value of code element and the index of code element
System, coding schedule TL' in include 2LThe different code element of individual value, the value of each code element is [0,2L-1]
An interior integer.
It should be noted that the decoding table being related in the present embodiment is and the coding schedule being related in previous embodiment
Corresponding table, is reciprocal relation between the two.
S304：According to the value of the code element for being obtained, from the decoding table TL' middle acquisition each pixel point
Group is in the decoding table TL' in corresponding code element index.
S305：According to the index of the code element for being obtained, obtain each pixel and be grouped included pixel
Pixel value.
Specifically, in a specific embodiment of the present invention, for the arbitrary code element for being obtained
Index indexD, index index can be obtained according to following stepsDCorresponding pixel is grouped GDIncluded pixel
The pixel value of point：
It is determined that index indexDBinary numeral；
According to btValue and the code length L, obtain pixel packet GDAccording to default pixel
Pixel value i of the serial number that puts in order for the pixel of tt, wherein, btIn expression binary numeral from low level to height
Value of the bit-identify for the bit of t, index
Specifically, according to btValue and code length L, obtain pixel packet GDAccording to default picture
Vegetarian refreshments puts in order the pixel value i of the pixel for being designated ttWhen, obtain btValue value after, first according to bt
Value judge that it is stain or white point to be designated the pixel of t, if btValue be 0, then it represents that above-mentioned pixel
Point is stain, if btValue be 1, then it represents that above-mentioned pixel is white point, the then face according to the pixel
Color and code length L determine the pixel value of the pixel.
For example, it is assumed that code length L is equal to 1, then
When the pixel is stain, its pixel value is 0；
When the pixel is white point, its pixel value is 1.
Assume that code length L is equal to 8, then
When the pixel is stain, its pixel value is 0；
When the pixel is white point, its pixel value is 255.
Other situations are similar to be will not enumerate here.
It should be noted that it is assumed that binary value is " 1101 ", then from low level to it is high-order each
Value is respectively：1st, 0,1,1, from low level to high-order each mark can be：0th, 1,2,3,
Certainly, the initial value of above-mentioned mark is to start from 0 here, and its initial value can also be from the beginning of 1 certainly, this
Application is not defined to this, in addition, also may be used from low level to high-order each mark in binary numeral
To be simply interpreted as according to from low level to each corresponding serial number in the order binary numeral of a high position.
S306：According to the pixel value for being obtained, bianry image to be decoded is generated.
The coded data of bianry image to be decoded is：According to the regularly arranged coded data of following information arrangement,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
As seen from the above, in the scheme that the present embodiment is provided, the coded data for being decoded is to two-value to be decoded
The pixel included by image is grouped, according to pixel included in each pixel packet after packet
Pixel value, calculates the index that the pixel is grouped in corresponding code element in coding schedule, according to being calculated
Code element index, each pixel is obtained from coding schedule and is grouped in corresponding coding unit in coding schedule
The value of element, according to the value of the code element for being obtained, the coded data of generation.One pixel packet
In multiple pixels one code element of correspondence for including, therefore, the scheme decoding provided using the present embodiment
The memory space that takes of coded data to be far smaller than memory space that bianry image to be decoded takes.
Corresponding with above-mentioned bi-level image coding method, the embodiment of the present invention additionally provides a kind of bianry image
Code device.
Fig. 4 is a kind of structural representation of bi-level image coding device provided in an embodiment of the present invention, the device bag
Include：
Image obtains module 401, for obtaining bianry image to be encoded；
Coding schedule obtains module 402, for according to default code length L, from default coding schedule data base
It is middle to obtain the corresponding coding schedule T of the code length LL, wherein, the coding schedule TLFor recording code element
Index and the value of code element between corresponding relation, the coding schedule TLIn include 2LIndividual value is different
Code element, the value of each code element is [0,2L- 1] integer in；
Pixel grouping module 403, for according to default pixel order of packets, to the two-value to be encoded
The pixel included by image is grouped, wherein, pixel included in each pixel packet after packet
Quantity it is identical, and no more than described code length L；
Index computing module 404, for the pixel according to pixel included in each pixel packet after packet
Value, calculates the pixel and is grouped in the coding schedule TLIn corresponding code element index；
First value obtains module 405, for the index according to calculated code element, from the coding
Table TLMiddle each pixel of acquisition is grouped in the coding schedule TLIn corresponding code element value；
Coded data generation module 406, for the value according to the code element for being obtained, generate described in wait to compile
The corresponding coded data of code bianry image.
Specifically, the index computing module 404, specifically for for after packet arbitrary pixel be grouped G,
According to following formula, calculate the pixel and G is grouped in the coding schedule TLIn corresponding code element rope
Draw indexG,
Wherein, t represents the order of the pixel in pixel packet G of putting in order according to default pixel
Number, itRepresent pixel value of the serial number for the pixel of t in pixel packet G.
Specifically, the coded data generation module 406 can include：
Image information obtains submodule, for obtaining the image information of the image to be encoded；
Coded data obtains submodule, for according to the image information for being obtained and the code element for being obtained
Value, according to default information arrangement rule, generates the corresponding coded data of the bianry image to be encoded.
Specifically, the coded data obtains submodule, specifically for according to following information arrangement rule, raw
Into the corresponding coded data of the bianry image to be encoded,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
As seen from the above, in the scheme that the present embodiment is provided, after obtaining bianry image to be encoded, according to default
Code length L, the corresponding coding schedule T of code length L are obtained from default coding schedule data baseL, according to
Default pixel order of packets, is grouped to the pixel included by bianry image to be encoded, according to point
After group included in the packet of each pixel pixel pixel value, calculate the pixel and be grouped in coding schedule TL
In corresponding code element index, according to the index of calculated code element, from coding schedule TLIn obtain
Obtain each pixel and be grouped in coding schedule TLIn corresponding code element value, according to obtained coding unit
The value of element, generates the corresponding coded data of bianry image to be encoded.As can be seen that a pixel by more than
One code element of multiple pixel correspondences included in point packet, therefore, according to the side that the present embodiment is provided
After case is to bi-level image coding to be encoded, the memory space that the coded data for obtaining takes far smaller than will be waited to compile
The memory space that code bianry image takes.
In a kind of relatively good implementation of the present invention, referring to Fig. 5, there is provided another kind of bi-level image coding dress
The structural representation put, compared with previous embodiment, in the present embodiment, said apparatus also include：
Coded data memory module 407, after generating coded data in the coded data generation module,
The coded data for being generated is stored to default image storage file tail, wherein, the default image is deposited
Storage file is used to store the corresponding coded data of at least one bianry image.
Optionally, above-mentioned bi-level image coding device can also include：
Data modification command reception module, the data for receiving for the default image storage file are repaiied
Change instruction, wherein, at least include in the data modification instruction：It is the mark of bianry image to be modified, to be repaired
Change the modified values of the mark and image information to be modified of image information；
Coded data searching modul, for the two-value described to be modified included according to data modification instruction
The mark of image, searches the corresponding volume of the bianry image to be modified in the default image storage file
Code data；
Coded data modified module, for the image described to be modified included according to data modification instruction
The modified values of the mark of information and the image information to be modified, change the coded data for finding.
As seen from the above, in the scheme that the present embodiment is provided, the coded data for being generated is stored to default
Image storage file tail, and the corresponding coding of multiple bianry images in default image storage file, can be stored
Data, then when needing to load multiple files, only need to load the default image storage file, it is clear that
I/O operation is reduced to by multiple I/O operation, is needing loading many using scheme provided in an embodiment of the present invention
The number of times of I/O operation in the case of individual file, can be greatly reduced.
Corresponding with above-mentioned bianry image coding/decoding method, the embodiment of the present invention additionally provides a kind of bianry image
Decoding apparatus.
Fig. 6 is a kind of structural representation of bianry image decoding apparatus provided in an embodiment of the present invention, the device bag
Include：
Coded data obtains module 601, for obtaining the coded data of bianry image to be decoded；
Second value obtains module 602, for according to default code length L, carrying out to the coded data
Parsing, and then the value that each pixel of the bianry image to be decoded is grouped corresponding code element is obtained,
Wherein, pixel is grouped into：According to default pixel order of packets, to the bianry image institute to be decoded
Comprising pixel carry out being grouped what is obtained, included in the packet of each pixel, the quantity of pixel is identical,
And no more than described default code length L；
Decoding table obtains module 603, for according to the default code length L, from default decoding table number
According to the corresponding decoding table T of the code length L are obtained in storehouseL', wherein, the decoding table TL' encode for recording
Corresponding relation between the index of the value and code element of element, the coding schedule TL' in include 2LIndividual value is not
Same code element, the value of each code element is [0,2L- 1] integer in；
Index obtains module 604, for the value according to the code element for being obtained, from the decoding table TL' in
Obtain each pixel and be grouped in the decoding table TL' in corresponding code element index；
Pixel value obtains module 605, for the index according to the code element for being obtained, obtains each pixel
The pixel value of the included pixel of packet；
Image generation module 606, for according to the pixel value for being obtained, generating the bianry image to be decoded.
Specifically, the pixel value obtains module 605, specifically for arbitrary code element for being obtained
Index indexDCorresponding pixel is grouped GDThe pixel value of included pixel；
Wherein, the pixel value obtains module, including：
Numerical value determination sub-module, for determining the index indexDBinary numeral；
Pixel value obtains submodule, for according to btValue and the code length L, obtain the pixel
Point packet GDAccording to default pixel put in order serial number be t pixel pixel value it, wherein,
btThe value of the bit of t, the index are designated in representing the binary numeral from low level to a high position
Specifically, the coded data obtains module 601, specifically for the mark according to bianry image to be decoded,
The coded data of the bianry image to be decoded is obtained from default image storage file, wherein, it is described pre-
If image storage file be used to store the corresponding coded data of at least one bianry image.
Specifically, the coded data of the bianry image to be decoded is：It is regularly arranged according to following information arrangement
Coded data,
Id1Id2Ii1Id2Ii2…Id2Iij…Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
As seen from the above, in the scheme that the present embodiment is provided, the coded data for being decoded is to two-value to be decoded
The pixel included by image is grouped, according to pixel included in each pixel packet after packet
Pixel value, calculates the index that the pixel is grouped in corresponding code element in coding schedule, according to being calculated
Code element index, each pixel is obtained from coding schedule and is grouped in corresponding coding unit in coding schedule
The value of element, according to the value of the code element for being obtained, the coded data of generation.One pixel packet
In multiple pixels one code element of correspondence for including, therefore, the scheme decoding provided using the present embodiment
The memory space that takes of coded data to be far smaller than memory space that bianry image to be decoded takes.
For device embodiment, as which is substantially similar to embodiment of the method, so the comparison of description is simple
Single, related part is illustrated referring to the part of embodiment of the method.
It should be noted that herein, such as first and second or the like relational terms be used merely to by
One entity or operation are made a distinction with another entity or operation, and are not necessarily required or implied these
There is any this actual relation or order between entity or operation.And, term " including ", "comprising"
Or its any other variant is intended to including for nonexcludability, so that including a series of mistake of key elements
Journey, method, article or equipment not only include those key elements, but also including be not expressly set out other
Key element, or also include the key element intrinsic for this process, method, article or equipment.Do not having
In the case of more restrictions, the key element limited by sentence "including a ...", it is not excluded that wanting including described
The process of element, method, also there is other identical element in article or equipment.
One of ordinary skill in the art will appreciate that realizing all or part of step in said method embodiment
Program be can be by instruct the hardware of correlation to complete, described program can be stored in computer-readable
Take in storage medium, the storage medium for obtaining designated herein, such as：ROM/RAM, magnetic disc, CD etc..
Presently preferred embodiments of the present invention is the foregoing is only, protection scope of the present invention is not intended to limit.
All any modification, equivalent substitution and improvements made within the spirit and principles in the present invention etc., are all contained in
In protection scope of the present invention.
Claims (20)
1. a kind of bi-level image coding method, it is characterised in that methods described includes：
Obtain bianry image to be encoded；
According to default code length L, the code length L correspondences are obtained from default coding schedule data base
Coding schedule TL, wherein, the coding schedule TLFor recording the index of code element and the value of code element
Between corresponding relation, the coding schedule TLIn include 2LThe different code element of individual value, each code element
Value be [0,2L- 1] integer in；
According to default pixel order of packets, the pixel included by the bianry image to be encoded is carried out
Packet, wherein, after packet, included in each pixel packet, the quantity of pixel is identical, and no more than institute
State code length L；
According to the pixel value of pixel included in each pixel packet after packet, calculate the pixel and be grouped
In the coding schedule TLIn corresponding code element index；
According to the index of calculated code element, from the coding schedule TLMiddle each pixel that obtains is grouped
In the coding schedule TLIn corresponding code element value；
According to the value of the code element for being obtained, the corresponding coded data of the bianry image to be encoded is generated.
2. method according to claim 1, it is characterised in that described according to each pixel after packet
The pixel value of pixel included in packet, calculates the pixel and is grouped in the coding schedule TLIn corresponding volume
The index of data code, including：
For arbitrary pixel is grouped G after packet, according to following formula, calculate the pixel packet G and exist
The coding schedule TLIn corresponding code element index indexG,
Wherein, t represents the order of the pixel in pixel packet G of putting in order according to default pixel
Number, itRepresent pixel value of the serial number for the pixel of t in pixel packet G.
3. method according to claim 1, it is characterised in that described according to the code element for being obtained
Value, generate the corresponding coded data of the bianry image to be encoded, including：
Obtain the image information of the image to be encoded；
According to the image information for being obtained and the value of the code element for being obtained, according to default information arrangement
Rule, generates the corresponding coded data of the bianry image to be encoded.
4. method according to claim 3, it is characterised in that it is described according to described image information and
The value of the code element for being obtained, according to default information arrangement rule, generates the binary map to be encoded
After as corresponding coded data, also include：
The coded data for being generated is stored to default image storage file tail, wherein, the default figure
As storage file is used to store the corresponding coded data of at least one bianry image.
5. the method according to claim 3 or 4, it is characterised in that described according to the image for being obtained letter
The value of breath and the code element for being obtained, according to default information arrangement rule, generates described to be encoded two
The corresponding coded data of value image, including：
According to following information arrangement rule, the corresponding coded data of the bianry image to be encoded is generated,
Id1Id2Ii1Id2Ii2...Id2Iij...Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
6. method according to claim 4, it is characterised in that methods described also includes：
The data modification instruction for the default image storage file is received, wherein, the data modification
At least include in instruction：The mark of bianry image to be modified, the mark of image information to be modified and to be modified
The modified values of image information；
The mark of the bianry image described to be modified included according to data modification instruction, described default
Image storage file in search the corresponding coded data of the bianry image to be modified；
The mark of image information described to be modified that included according to data modification instruction and described to be repaired
Change the modified values of image information, change the coded data for finding.
7. a kind of bianry image coding/decoding method, it is characterised in that methods described includes：
Obtain the coded data of bianry image to be decoded；
According to default code length L, the coded data is parsed, and then obtain described to be decoded two
Each pixel of value image is grouped the value of corresponding code element, wherein, pixel is grouped into：According to
Default pixel order of packets, carries out packet to the pixel included by the bianry image to be decoded and obtains
, included in each pixel packet, the quantity of pixel is identical, and no more than described default coding length
Degree L；
According to the default code length L, the code length L is obtained from default decoding table data base
Corresponding decoding table T 'L, wherein, the decoding table T 'LFor recording the value of code element and the rope of code element
Corresponding relation between drawing, the coding schedule T 'LIn include 2LThe different code element of individual value, each coding unit
The value of element is [0,2L- 1] integer in；
According to the value of the code element for being obtained, from the decoding table T 'LMiddle each pixel of acquisition is grouped in institute
State decoding table T 'LIn corresponding code element index；
According to the index of the code element for being obtained, the pixel that each pixel is grouped included pixel is obtained
Value；
According to the pixel value for being obtained, the bianry image to be decoded is generated.
8. method according to claim 7, it is characterised in that described according to the code element for being obtained
Index, obtain the pixel value that each pixel is grouped included pixel, including：
For the index index of the arbitrary code element for being obtainedD, the index is obtained according to following steps
indexDCorresponding pixel is grouped GDThe pixel value of included pixel：
Determine the index indexDBinary numeral；
According to btValue and the code length L, obtain the pixel and be grouped GDAccording to default picture
Vegetarian refreshments puts in order serial number for the pixel value i of the pixel of tt, wherein, btRepresent in the binary numeral from
Low level is designated the value of the bit of t, the index to a high position
9. the method according to claim 7 or 8, it is characterised in that acquisition bianry image to be decoded
Coded data, including：
According to the mark of bianry image to be decoded, described to be decoded two are obtained from default image storage file
The coded data of value image, wherein, the default image storage file is used to store at least one binary map
As corresponding coded data.
10. method according to claim 9, it is characterised in that the coding of the bianry image to be decoded
Data are：According to the regularly arranged coded data of following information arrangement,
Id1Id2Ii1Id2Ii2...Id2Iij...Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
11. a kind of bi-level image coding devices, it is characterised in that described device includes：
Image obtains module, for obtaining bianry image to be encoded；
Coding schedule obtains module, for according to default code length L, obtaining from default coding schedule data base
Obtain the corresponding coding schedule T of the code length LL, wherein, the coding schedule TLFor recording the rope of code element
Draw the corresponding relation and the value of code element between, the coding schedule TLIn include 2LThe different coding of individual value
Element, the value of each code element is [0,2L- 1] integer in；
Pixel grouping module, for according to default pixel order of packets, to the binary map to be encoded
As the pixel for being included is grouped, wherein, pixel included in each pixel packet after packet
Quantity is identical, and no more than described code length L；
Index computing module, for the pixel value according to pixel included in each pixel packet after packet,
Calculate the pixel and be grouped in the coding schedule TLIn corresponding code element index；
First value obtains module, for the index according to calculated code element, from the coding schedule
TLMiddle each pixel of acquisition is grouped in the coding schedule TLIn corresponding code element value；
Coded data generation module, for the value according to the code element for being obtained, generates described to be encoded
The corresponding coded data of bianry image.
12. devices according to claim 11, it is characterised in that the index computing module, specifically
For for arbitrary pixel packet G after packet, according to following formula, calculate the pixel packet G and exist
The coding schedule TLIn corresponding code element index indexG,
Wherein, t represents the order of the pixel in pixel packet G of putting in order according to default pixel
Number, itRepresent pixel value of the serial number for the pixel of t in pixel packet G.
13. devices according to claim 11, it is characterised in that the coded data generation module,
Including：
Image information obtains submodule, for obtaining the image information of the image to be encoded；
Coded data obtains submodule, for according to the image information for being obtained and the code element for being obtained
Value, according to default information arrangement rule, generates the corresponding coded data of the bianry image to be encoded.
14. devices according to claim 13, it is characterised in that described device also includes：
Coded data memory module, after generating coded data in the coded data generation module, will
The coded data for being generated is stored to default image storage file tail, wherein, the default image storage
File is used to store the corresponding coded data of at least one bianry image.
15. devices according to claim 13 or 14, it is characterised in that the coded data obtains son
Module, specifically for according to following information arrangement rule, generating the corresponding coding of the bianry image to be encoded
Data,
Id1Id2Ii1Id2Ii2...Id2Iij...Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
16. devices according to claim 14, it is characterised in that described device also includes：
Data modification command reception module, the data for receiving for the default image storage file are repaiied
Change instruction, wherein, at least include in the data modification instruction：It is the mark of bianry image to be modified, to be repaired
Change the modified values of the mark and image information to be modified of image information；
Coded data searching modul, for the two-value described to be modified included according to data modification instruction
The mark of image, searches the corresponding volume of the bianry image to be modified in the default image storage file
Code data；
Coded data modified module, for the image described to be modified included according to data modification instruction
The modified values of the mark of information and the image information to be modified, change the coded data for finding.
17. a kind of bianry image decoding apparatus, it is characterised in that described device includes：
Coded data obtains module, for obtaining the coded data of bianry image to be decoded；
Second value obtains module, for according to default code length L, parsing to the coded data,
And then the value that each pixel of the bianry image to be decoded is grouped corresponding code element is obtained, wherein,
Pixel is grouped into：According to default pixel order of packets, the bianry image to be decoded is included
Pixel carries out being grouped what is obtained, and included in each pixel packet, the quantity of pixel is identical, and less
In the default code length L；
Decoding table obtains module, for according to the default code length L, from default decoding table data base
It is middle to obtain the corresponding decoding table T ' of the code length LL, wherein, the decoding table T 'LFor recording code element
Value and the index of code element between corresponding relation, the coding schedule T 'LIn include 2LIndividual value is different
Code element, the value of each code element is [0,2L- 1] integer in；
Index obtains module, for the value according to the code element for being obtained, from the decoding table T 'LMiddle acquisition
Each pixel is grouped in the decoding table T 'LIn corresponding code element index；
Pixel value obtains module, for the index according to the code element for being obtained, obtains each pixel point
The pixel value of the included pixel of group；
Image generation module, for according to the pixel value for being obtained, generating the bianry image to be decoded.
18. devices according to claim 17, it is characterised in that the pixel value obtains module, tool
Body is used for the index index of the arbitrary code element for being obtainedDCorresponding pixel is grouped GDIncluded picture
The pixel value of vegetarian refreshments；
Wherein, the pixel value obtains module, including：
Numerical value determination sub-module, for determining the index indexDBinary numeral；
Pixel value obtains submodule, for according to btValue and the code length L, obtain the pixel
Point packet GDAccording to default pixel put in order serial number be t pixel pixel value it, wherein,
btThe value of the bit of t, the index are designated in representing the binary numeral from low level to a high position
19. devices according to claim 17 or 18, it is characterised in that the coded data obtains mould
Block, specifically for the mark according to bianry image to be decoded, obtains described from default image storage file
The coded data of bianry image to be decoded, wherein, the default image storage file is used for storage at least
The corresponding coded data of individual bianry image.
20. devices according to claim 19, it is characterised in that the volume of the bianry image to be decoded
Code data be：According to the regularly arranged coded data of following information arrangement,
Id1Id2Ii1Id2Ii2...Id2Iij...Id2Iin：E,
Wherein, Id1Represent the origin identification of the corresponding coded data of default bianry image, Id2Represent default
Separation mark between the image information of bianry image, IijAn image information of bianry image is represented, E is represented
The serial data being made up of the value of the code element for being obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510740338.5A CN106651972B (en) | 2015-11-03 | 2015-11-03 | Binary image coding and decoding methods and devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510740338.5A CN106651972B (en) | 2015-11-03 | 2015-11-03 | Binary image coding and decoding methods and devices |
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| Publication Number | Publication Date |
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