CN107801031A - A kind of lossless compression-encoding method to pure three primary colors image data - Google Patents
A kind of lossless compression-encoding method to pure three primary colors image data Download PDFInfo
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- CN107801031A CN107801031A CN201711099076.4A CN201711099076A CN107801031A CN 107801031 A CN107801031 A CN 107801031A CN 201711099076 A CN201711099076 A CN 201711099076A CN 107801031 A CN107801031 A CN 107801031A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/182—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a pixel
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
- H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
- H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
- H04N19/42—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation
- H04N19/423—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software implementation characterised by memory arrangements
Abstract
The present invention relates to a kind of lossless compression-encoding method to pure three primary colors image data, its by by the pixel Value Data of each pixel in picture to be compressed compared with a specified pixel value, if equal be recorded as the decimal system 1, otherwise it is recorded as the decimal system 0 and records the value of pixel, so order is relatively got off repeatedly and into a byte records by algorithm combination, recycle ratio is ultimately generated comprising the byte data and the new picture data files that have compressed of the pixel value of all storages after specified pixel value, all synthesis compared with until picture data files tail to be compressed.The lossless compression-encoding method to pure three primary colors image data of the present invention provides a kind of image data lossless compression method, and it can overcome in the prior art that picture compression compression ratio is low, compression effectiveness is insufficient and the problem of lossy compression method；Even the pixel of scattered discontinuous repetition could be used that less byte to record, image data compression ratio is improved, and keep image data intact.
Description
Technical field
The present invention relates to picture compression technical field, concretely relates to a kind of to the lossless of pure three primary colors image data
Compaction coding method.
Background technology
At present, known picture compression method has lossy compression method method and lossless compression.
Lossless compression generally has run length encoding, and its general principle is that color value identical in one scan line is adjacent
Pixel represents that first character section is a count value with two bytes, the number repeated for specified pixel；Second byte
It is the value of specific pixel.Lossless compression can preserve the quality of image better, but if it is changeable to run into picture pixels, together
The location of pixels of value is also changeable scattered, will result in the byte number of the count value of the number repeated for recording specified pixel
Quantitative change is big, and two bytes can only record a pixel so that the compression ratio of this method is than relatively low.
Lossy compression method method is typically that color space is reduced to the color commonly used in image.Selected color is defined on pressure
In the palette of contracting image head, each pixel in image represents that this method can be with trembling with color index in palette
Dynamic (en:Dithering) it is used together with fuzzy color border.Lossy compression method has following methods：
Colourity is sampled；This make use of human eye to be much larger than color change for the sensitiveness that brightness changes, and can thus incite somebody to action
It is even more more that colouring information in image reduces half.
Transition coding；First by the Fourier correlating transforms as discrete cosine transform (DCT) or wavelet transformation,
Then quantified and compressed with entropy code method.
Fractal compression (en:Fractal compression)；Search self similarity part in figure and cause compression time mistake
It is long.
Compressed using lossy compression method method and decompress the picture is incomplete that suitable speed is slower, and solution presses out, so as to limit
Some need the use of the occasion of full picture.
The content of the invention
For the deficiency of prior art, the invention provides a kind of lossless compression-encoding side to pure three primary colors image data
Method.
The concrete technical scheme of the lossless compression-encoding method to pure three primary colors image data of the present invention is as follows：
A kind of lossless compression-encoding method to pure three primary colors image data, compressed picture is treated by order from first to last
In each pixel handled；Processing step is as follows：
S1：Extract the pixel Value Data of pixel in picture to be compressed；
S2：Compared with the pixel Value Data of the pixel of extraction is carried out repeatedly with a specified pixel value；Wherein, will with it is described
The pixel value of pixel described in specified pixel value identical presses step S3 processing；Wherein, by with the specified pixel value not phase
The pixel value of the pixel presses step S4 processing；
S3：The pixel value is recorded as the decimal system 1；
S4：The pixel value is recorded as the decimal system 0 and stores the pixel value of the pixel；
S5：All decimal systems 0 of all decimal systems 1 of step S3 records and step S4 records are passed through into algorithm
And synthesize a byte and store；
S6：Judge the pixel data handled by the step S5 whether be the picture to be compressed data tail；It is if described
Pixel data is not the data tail of the picture to be compressed, then by step S7 processing；If the pixel data is described to be compressed
The data tail of picture, then by step S8 processing；
S7：Next pixel data in the picture to be compressed is handled by the method for the step S1-S6；
S8：By the specified pixel value, all byte datas after step S5 synthesis and all step S4
The pixel value of middle storage is combined into new picture pixels file, so as to realize the compression to the picture to be compressed.
The lossless compression-encoding method to pure three primary colors image data of the present invention is by by each picture in picture to be compressed
The pixel Value Data of element is recorded as compared with a specified pixel value, and by the pixel value with specified pixel value identical pixel
1, the pixel value of the pixel different from specified pixel value is recorded as 0 and records the value of pixel, so order relatively repeatedly simultaneously
Got off by algorithm combination into a byte records, value corresponding to each (bit) of this byte is specified pixel above
Value either other pixel values, recycle ratio ultimately generate the new picture that have compressed compared with until picture data files tail to be compressed
Data file, new data file include the specified pixel value, all byte datas and institute after step S5 synthesis
There is the pixel value stored in the step S4, so as to reach the purpose of the compression of image data.
Pass through above-mentioned technical proposal, the lossless compression-encoding method of the invention to pure three primary colors image data provide one
Kind image data lossless compression method, it can improve image data compression ratio, and make picture is complete lossless；It can overcome existing
Picture compression compression ratio is low in technology, compression effectiveness is insufficient and the problem of lossy compression method；Even scattered discontinuous repetition
Pixel could be used that less byte to record, and improve image data compression ratio, and keep image data intact.
According to a preferred embodiment, the specified pixel value is：It is complete by picture to be compressed described in order analogy
That most pixel value of quantity in picture to be compressed that portion's pixel obtains, described.
According to a preferred embodiment, the specified pixel value is one in decimal system 0-255.
According to a preferred embodiment, in the step S2, the pixel Value Data of the pixel of extraction and institute
The number that specified pixel value compares is stated to be total up to 8 times.
In the step S5, entered recorded by the step S3 all ten according to a preferred embodiment
8 data that all decimal systems 0 of system 1 and step S4 records form are by algorithm and one byte of synthesis and store.
According to a preferred embodiment, in the step S5, the algorithm is the institute that records the step S3
There are the decimal system 1 and all decimal systems 0 of step S4 records to be converted into multiple binary systems simultaneously with two factorization, remainder respectively
One byte storage of synthesis.
According to a preferred embodiment, the algorithm is all decimal systems 1 that will be recorded by the step S3 and institute
8 data for stating the composition of all decimal systems 0 of step S4 records are converted into 8 binary systems simultaneously with two factorization, remainder respectively
One byte storage of synthesis.
Compared with prior art, the lossless compression-encoding method of the invention to pure three primary colors image data has and had as follows
Beneficial effect：
The lossless compression-encoding method to pure three primary colors image data of the present invention is by by each picture in picture to be compressed
The pixel Value Data of element is recorded as compared with a specified pixel value, and by the pixel value with specified pixel value identical pixel
1, the pixel value of the pixel different from specified pixel value is recorded as 0 and records the value of pixel, so order relatively repeatedly simultaneously
Got off by algorithm combination into a byte records, value corresponding to each (bit) of this byte is specified pixel above
Value either other pixel values, recycle ratio ultimately generate the new picture that have compressed compared with until picture data files tail to be compressed
Data file, new data file include the specified pixel value, all byte datas and institute after step S5 synthesis
There is the pixel value stored in the step S4, so as to reach the purpose of the compression of image data.
Pass through above-mentioned technical proposal, the lossless compression-encoding method of the invention to pure three primary colors image data provide one
Kind image data lossless compression method, it can improve image data compression ratio, and make picture is complete lossless；It can overcome existing
Picture compression compression ratio is low in technology, compression effectiveness is insufficient and the problem of lossy compression method；Even scattered discontinuous repetition
Pixel could be used that less byte to record, and improve image data compression ratio, and keep image data intact.
Brief description of the drawings
Fig. 1 is the present invention to a kind of stream of preferred embodiment in the lossless compression-encoding method of pure three primary colors image data
Cheng Tu.
Embodiment
Compression of images refers to that reduction represents the data volume needed during digital picture, and why view data can be compressed, just
It is because there is redundancy in data.The redundancy of view data is mainly shown as：Correlation in image between adjacent pixel causes
Spatial redundancy；Time redundancy caused by correlation in image sequence between different frame be present；Different color planes or spectral band
Correlation caused by spectral redundancy.The purpose of data compression is exactly to represent data institute by removing these data redundancies to reduce
The bit number needed.
The lossless compression-encoding method to pure three primary colors image data of the present invention is carried out in detail below in conjunction with the accompanying drawings
Explanation.
A kind of lossless compression-encoding method to pure three primary colors image data, compressed picture is treated by order from first to last
In each pixel handled；Processing step is as follows：
S1：Extract the pixel Value Data of pixel in picture to be compressed.
S2：Compared with the pixel Value Data of the pixel of extraction is carried out repeatedly with a specified pixel value；And will with it is described
The pixel value of pixel described in specified pixel value identical presses step S3 processing；By the picture with the specified pixel value not phase
The pixel value of element presses step S4 processing；
Wherein, the specified pixel value is being obtained by picture whole pixel to be compressed described in order analogy, described treats
That most pixel value of quantity in compressed picture；It is one in decimal system 0-255；
Also, number of the pixel Value Data of the pixel of extraction compared with the specified pixel value is total up to 8 times.It is logical
Can just be formed by crossing the comparison of 8 times altogether and record by 8 of a byte.
S3：The pixel value is recorded as the decimal system 1.
S4：The pixel value is recorded as the decimal system 0 and stores the pixel value of the pixel.
S5：All decimal systems 0 of all decimal systems 1 of step S3 records and step S4 records are passed through into algorithm
And synthesize a byte and store.
Preferably, it is by all decimal systems 1 recorded by the step S3 and step S4 notes in the step S5
8 data that all decimal systems 0 of record form are by algorithm and one byte of synthesis and store.
The algorithm is all decimal systems 0 by all decimal systems 1 of step S3 records and step S4 records
It is converted into multiple binary systems with two factorization, remainder respectively and is synthesized a byte storage.
Specifically, the institute that the algorithm records for all decimal systems 1 that will be recorded by the step S3 and the step S4
8 data being made up of the decimal system 0 are converted into 8 binary systems and are synthesized a byte storage with two factorization, remainder respectively.
Such as：(D represents the decimal system, and B represents binary system)
1 turn of binary system of decimal integer：
1/2=0 mores than 1, and result is 1 (D)=00000001 (B)；
0 turn of binary system of decimal integer：
0/2=0 mores than 0, and result is 0 (D)=00000000 (B)；
8 binary systems are merged into a byte：
1→00000001(B)
2→00000000(B)
3→00000001(B)
4→00000001(B)
5→00000001(B)
6→00000000(B)
7→00000001(B)
8→00000001(B)
Sequentially 1 obtains 00000010 (B) plus sequentially 2 00000010 (B) is obtained to moving to left one, and obtained end value is again
To move to left one obtain 00000100 (B) along with order 3 obtain 00000101 (B) be moved a bit further plus order 4, so displacement
With cumulative 8 bytes for finally giving 10111011 (B) 8 bits.
S6：Judge the pixel data handled by the step S5 whether be the picture to be compressed data tail；It is if described
Pixel data is not the data tail of the picture to be compressed, then by step S7 processing；If the pixel data is described to be compressed
The data tail of picture, then by step S8 processing.
S7：Next pixel data in the picture to be compressed is handled by the method for the step S1-S6.
S8：By the specified pixel value, all byte datas after step S5 synthesis and all step S4
The pixel value of middle storage is combined into new picture pixels file, so as to realize the compression to the picture to be compressed.
The explanation present invention is to a kind of preferred in the lossless compression-encoding method of pure three primary colors image data below in conjunction with the accompanying drawings
Embodiment.
Fig. 1 shows the present invention to a kind of preferred embodiment in the lossless compression-encoding method of pure three primary colors image data
Flow chart.
As shown in figure 1, the lossless compression-encoding method specific main flow of the invention to pure three primary colors image data is such as
Under：
The first step：Program brings into operation；
Second step：Extract the pixel Value Data of picture pixels and carry out 8 comparisons with specified pixel value；
3rd step：In comparison procedure, the pixel value with pixel described in the specified pixel value identical is recorded as ten
System 1；Pixel value with the specified pixel value not pixel of phase is recorded as the decimal system 0 and stores the picture of the pixel
Element value；
4th step：By 8 decimal datas being made up of above-mentioned all decimal systems 1 and all decimal systems 0 respectively by two
Factorization, remainder are converted into 8 binary systems and synthesize a byte storage；
5th step：Judge whether image data tail；If it is judged as NO pixel value numbers of the Hui Ze to second step to next pixel
According to being handled, the 6th step is otherwise run to；
6th step：The picture pixels value of specified pixel value, the byte data synthesized more afterwards of storage and storage is combined into
New picture pixels file；
7th step：Terminate.
The lossless compression-encoding method to pure three primary colors image data of the present invention is by by each picture in picture to be compressed
The pixel Value Data of element is recorded as compared with a specified pixel value, and by the pixel value with specified pixel value identical pixel
1, the pixel value of the pixel different from specified pixel value is recorded as 0 and records the value of pixel, so order relatively repeatedly simultaneously
Got off by algorithm combination into a byte records, value corresponding to each (bit) of this byte is specified pixel above
Value either other pixel values, recycle ratio ultimately generate the new picture that have compressed compared with until picture data files tail to be compressed
Data file, new data file include the specified pixel value, all byte datas and institute after step S5 synthesis
There is the pixel value stored in the step S4, so as to reach the purpose of the compression of image data.
Pass through above-mentioned technical proposal, the lossless compression-encoding method of the invention to pure three primary colors image data provide one
Kind image data lossless compression method, it can improve image data compression ratio, and make picture is complete lossless；It can overcome existing
Picture compression compression ratio is low in technology, compression effectiveness is insufficient and the problem of lossy compression method；Even scattered discontinuous repetition
Pixel could be used that less byte to record, and improve image data compression ratio, and keep image data intact.
It should be noted that all features disclosed in this specification, or disclosed all methods or during the step of,
In addition to mutually exclusive feature and/or step, it can combine in any way.
In addition, above-mentioned specific embodiment is exemplary, those skilled in the art can opening in the disclosure of invention
Give and find out various solutions, and these solutions also belong to disclosure of the invention scope and fall into the protection of the present invention
Within the scope of.It will be understood by those skilled in the art that description of the invention and its accompanying drawing be it is illustrative and not form to power
The limitation that profit requires.Protection scope of the present invention is limited by claim and its equivalent.
Claims (7)
- A kind of 1. lossless compression-encoding method to pure three primary colors image data, it is characterised in that right by order from first to last Each pixel in picture to be compressed is handled；Processing step is as follows：S1：Extract the pixel Value Data of pixel in picture to be compressed；S2：Compared with the pixel Value Data of the pixel of extraction is carried out repeatedly with a specified pixel value；Wherein, will be specified with described The pixel value of pixel described in pixel value identical presses step S3 processing；Wherein, by with described in the specified pixel value not phase The pixel value of pixel presses step S4 processing；S3：The pixel value is recorded as the decimal system 1；S4：The pixel value is recorded as the decimal system 0 and stores the pixel value of the pixel；S5：All decimal systems 0 of all decimal systems 1 of step S3 records and step S4 records by algorithm and are closed Into a byte and store；S6：Judge the pixel data handled by the step S5 whether be the picture to be compressed data tail；If the pixel Data are not the data tails of the picture to be compressed, then by step S7 processing；If the pixel data is the picture to be compressed Data tail, then by step S8 processing；S7：Next pixel data in the picture to be compressed is handled by the method for the step S1-S6；S8：It will be deposited in the specified pixel value, all byte datas after step S5 synthesis and all step S4 The pixel value of storage is combined into new picture pixels file, so as to realize the compression to the picture to be compressed.
- A kind of 2. lossless compression-encoding method to pure three primary colors image data according to claim 1, it is characterised in that The specified pixel value is：That most picture of quantity in picture to be compressed obtained by picture whole pixel to be compressed described in order analogy, described Element value.
- A kind of 3. lossless compression-encoding method to pure three primary colors image data according to claim 2, it is characterised in that The specified pixel value is one in decimal system 0-255.
- A kind of 4. lossless compression-encoding method to pure three primary colors image data according to claim 1, it is characterised in thatIn the step S2, number of the pixel Value Data of the pixel of extraction compared with the specified pixel value is total up to 8 times.
- A kind of 5. lossless compression-encoding method to pure three primary colors image data according to claim 4, it is characterised in that It is all decimal systems 0 by all decimal systems 1 recorded by the step S3 and step S4 records in the step S5 8 data of composition are by algorithm and one byte of synthesis and store.
- 6. a kind of lossless compression-encoding method to pure three primary colors image data according to one of claim 1 to 5, it is special Sign is, in the step S5, the algorithm is to record all decimal systems 1 of step S3 records and the step S4 All decimal systems 0 respectively with two factorization, remainder is converted into multiple binary systems and synthesizes a byte storage.
- A kind of 7. lossless compression-encoding method to pure three primary colors image data according to claim 6, it is characterised in that The algorithm is form all decimal systems 1 recorded by the step S3 and the step the S4 all decimal systems 0 recorded 8 Individual data are converted into 8 binary systems and are synthesized a byte storage with two factorization, remainder respectively.
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