CN104835185B - The decoding method and multi-media transmission system of a kind of three-dimension code - Google Patents
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Abstract
The invention discloses a kind of decoding method of three-dimension code and multi-media transmission system, methods described includes：Coding step：Multimedia source files are encoded and are converted to binary code stream；The binary code stream is subjected to cutting according to the capacity of Quick Response Code every described；According to cutting result, every Quick Response Code use is filled with coloured rectangle grid；Added respectively at the head and the tail both ends of the Quick Response Code of one group of Time Continuous and start frame sequence and terminate frame sequence, initial alignment figure, and the addition isolation frame between Quick Response Code described in every two frame are added before the startup frame sequence, ultimately generates the three-dimension code；Decoding step：Image rectification is carried out using the initial alignment figure；Data acquisition extraction is carried out to Quick Response Code described in every frame in the three-dimension code, obtains the original binary code stream, and decoded to obtain the multimedia source files；The present invention is greatly improved three-dimension code data capacity, and improves the security of transmission channel.
Description
Technical field
The present invention relates to information transferring method and device field, particularly relates to a kind of decoding method of three-dimension code and more matchmakers
Body Transmission system.
Background technology
Information transfer under non-physical connections has important application in information security field.In order to prevent the information of Intranet
The subjective attack of interference, monitoring, shielding into outer net transmitting procedure etc. and the influence of objective environment, it is necessary to improve the peace of channel
Quan Xing.
The content of the invention
In view of this, it is an object of the invention to propose the decoding method and multi-media transmission system of a kind of three-dimension code.
Based on a kind of above-mentioned purpose decoding method of three-dimension code provided by the invention, the three-dimension code is connected by one group of time
Continuous Quick Response Code composition, methods described include：
Coding step：
Multimedia source files are encoded and are converted to binary code stream；
The binary code stream is subjected to cutting according to the capacity of Quick Response Code every described；
According to cutting result, every Quick Response Code use is filled with coloured rectangle grid；
Added respectively at the head and the tail both ends of the Quick Response Code of one group of Time Continuous and start frame sequence and terminate frame sequence,
Initial alignment figure, and the addition isolation frame between Quick Response Code described in every two frame are added before the startup frame sequence, most throughout one's life
Into the three-dimension code；
Decoding step：
Image rectification is carried out using the initial alignment figure；
Data acquisition extraction is carried out to Quick Response Code described in every frame in the three-dimension code, obtains the original binary code
Stream, and decoded to obtain the multimedia source files.
Preferably, the Quick Response Code includes：Positioned at the image outermost dead zone of one week, positioned at the version of one apex of image
This ID, positioned at the secondary witness marker of other apexes of image, the master positioning mark positioned at image border.
Preferably, the coloured rectangle grid of the band represents eight kinds of different colors by tri- passages of R, G, B, respectively
The gray scale of passage uses 0 and 255 two extreme value.
Preferably, the initial alignment figure be a frame outermost one week be grey, the image that other parts are black.
Preferably, the startup frame sequence and termination frame sequence are one group of alternate image of black and white, for triggering image
IMAQ of the harvester to the three-dimension code.
Preferably, the isolation frame is a frame black color image.
Preferably, in the decoding step, further comprise：
To the collection image isolated described in any two between frame, pass through brightness comparative approach, extraction effective described two
Tie up code.
Preferably, the master positioning is masked as strip；In the decoding step, further comprise：
Judge whether first Quick Response Code rotates by the master positioning mark, rotation is recorded if rotating
Gyration, and the Quick Response Code afterwards is rotated by the angle, if it is not, not processing then.
Present invention also offers a kind of multi-media transmission system, the system is using the as above three-dimension code described in any one
Decoding method, including：
Server, for completing the coding step and showing the three-dimension code；
Image collecting device, for gathering the three-dimension code；
Client computer, for receiving the three-dimension code of described image harvester collection, and complete the decoding step.
Preferably, described image harvester is industrial camera；The indicator screen refreshing frequency of the server is more than
Equal to 100Hz, the time for exposure of the industrial camera and the screen-refresh time consistency of the display of the server；
When carrying out the decoding step, the industrial camera carries out white balance processing first.
From the above it can be seen that the decoding method and multi-media transmission system of three-dimension code provided by the invention, institute
The three-dimension code stated is made up of the Quick Response Code of one group of Time Continuous, realizes three dimensional stress, is greatly improved data capacity, is led to simultaneously
The addition for crossing special frames further increases laser propagation effect；For the Quick Response Code in the present invention, its by and use colouring information
Encoded, with data capacity of the conventional two-dimensional code-phase than improving single two-dimensional code image；Described multi-media transmission system
Using the decoding method of three-dimension code, i.e., using medium of the optical signal as the multimedia transmission under non-physical connections, improve and pass
The security of defeated channel.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the Quick Response Code schematic diagram of the embodiment of the present invention；
Fig. 2 is the front and rear image of the frame Quick Response Code collected in the embodiment of the present invention；
Fig. 3 is the multi-media transmission system structural representation of the embodiment of the present invention.
Embodiment
For the object, technical solutions and advantages of the present invention are more clearly understood, below in conjunction with specific embodiment, and reference
Accompanying drawing, the present invention is described in more detail.
The embodiments of the invention provide a kind of decoding method of three-dimension code, wherein, the three-dimension code is by one group of time
Continuous Quick Response Code composition composition, i.e., add time dimension in ordinary two dimensional code.Methods described includes：
Coding step：
Multimedia source files are encoded and are converted to binary code stream；
The binary code stream is subjected to cutting according to the capacity of Quick Response Code every described；
According to cutting result, every Quick Response Code use is filled with coloured rectangle grid；
Added respectively at the head and the tail both ends of the Quick Response Code of one group of Time Continuous and start frame sequence and terminate frame sequence,
Initial alignment figure, and the addition isolation frame between Quick Response Code described in every two frame are added before the startup frame sequence, most throughout one's life
Into the three-dimension code；
Decoding step：
Image rectification is carried out using the initial alignment figure；
Data acquisition extraction is carried out to Quick Response Code described in every frame in the three-dimension code, obtains the original binary code
Stream, and decoded to obtain the multimedia source files.
In the coding step of the present embodiment：
Information source is multimedia, and source file is encoded by certain coding rule, is converted to binary code stream.Two are entered
Code stream processed is multiple according to the capacity cutting of every Quick Response Code, and every Quick Response Code is filled with coloured rectangular tiles, finally
The fill rule of code stream in one Quick Response Code figure can artificially arrange.The error correction of each Quick Response Code figure, mask can be according to people
Handled for the rule of agreement.Played after addition in multiple Quick Response Code figures of generation is started into frame, isolation frame, abort frame, then
Form the three-dimension code that time shaft is the third dimension.
If setting the binary code stream after changing as M, the numeric data code capacity N of every Quick Response Code, then it is institute that M/N, which rounds up,
The number of the Quick Response Code figure needed.It is in the single two-dimensional code image Breadth Maximum that the indicator screen of server end can accommodate
nmaxPixel, then three-dimension code width caused by server end is set as nmaxPixel.Because the image on screen is after camera adopts figure,
Interfering for color is produced between two rectangle frames, therefore, in the present invention, the minimum filling square block of three-dimension code
The length of side is mminPixel (is at least 8), then the square tiles total number of single two-dimensional code figure shares (nmax/mmin)2.For holding
The rectangular tiles number of information carrying breath is (nmax/mmin)2-4(nmax/mmin- 1), for carrying frame information rectangular tiles number as 2
(nmax/mmin) -3, and be used for the rectangular tiles number for carrying data message, i.e. N=(nmax/mmin)2-6(nmax/mmin)+7-
nversion, wherein nversionIt will be stated in detail below for version information.
With reference to figure 1, for the Quick Response Code schematic diagram of the embodiment of the present invention.
To describe in detail, three-dimension code is set in the present embodiment can accommodate 4096 Quick Response Code figures, and single two-dimensional code figure accommodates
512Byte code streams, then total capacity is 2MByte code stream.Provide that the form of a Quick Response Code figure is as shown in Figure 1.In order to detailed in figure
Thin to introduce regional, spy adds horizontal, ordinate to illustrate in figure, should without display in three-dimension code figure caused by reality
Coordinate.
Firstly, for coding stream, source data can be converted to number by multimedia file according to certain rule being manually set
Word or 8-bit patterns, such as image data source, the pixel value of each of which pixel can be subjected to bit stream description with 8-bit patterns.And
Need adding different file format type designators before bit stream for different file types, such as can be in Miscellaneous Documents
24 file format type designators are added before type, as shown in table 1.
The file format type designator of table 1
If the totalframes of three-dimension code is set as Nframe, then the length of data bit flow be up to Nbit=Nframe*N.All kinds of numbers
It is as shown in table 2 according to the bit stream length calculation formula of pattern.If being 2MByte code stream according to total capacity, Various types of data pattern
Count indicator digit is also pointed out in table 2：
Bit stream length and count indicator digit table under the Various types of data pattern of table 2
For each Quick Response Code in the three-dimension code in the present embodiment, its color coding rule：Each grid in Fig. 1
Color is to carry 3bit letters to 0~7 this 8 digital expressions, i.e. each color by controlling tri- passages of R, G, B to realize
Breath.Color and the rule of correspondence of code stream can artificially provide that the corresponding relation of color and code stream in Fig. 1 is as shown in table 3.
The color of table 3 and code stream corresponding table
In single two-dimensional code figure, region below is set：
Dead zone：A wherein peripheral circle gray area is dead zone, for auxiliary positioning code graph region.Its color settings is three
The grey of passage equal 128, as shown in Figure 1.After removing dead zone, the rectangular tiles number for carrying information is to be previously mentioned
(nmax/mmin)2-4(nmax/mmin-1)。
Secondary witness marker：In Fig. 1, (1,1), (1,38), (38,1) are secondary witness marker, positioned at information data part
Three corner points, are indicated with black.
Frame ID mark regions (being main witness marker again)：In Fig. 1, (2,1)~(19,1) be frame ID 1st area, (20,1)
~(37,1) are frame ID 2nd area, and (1,2)~(1,19) is frame ID 3rd area, and (1,20)~(1,37) is frame ID 4th area.This four
Region is used for the identification of frame sequence, and master positioning mark, and the coded image of rotation is corrected.In actual applications, may be used
It is six regions, eight regions or more by this four region divisions, but when zoning increases, it is necessary to secondary witness marker
Auxiliary positioning.Because each area can represent 0~7 this 8 numerals, so scheme used in Fig. 1 can represent 0~4095 totally 4096
Frame.And it is calculated as 2026 shown in Fig. 1 for a code figure in three-dimension code, its frame ID.
Revision ID：Code figure in the block of information part lower right corner, may specify a bit of region be used for filling information source numbering or
The information such as start context, i.e., n mentioned hereinbeforeversionIndividual rectangle block number.Such as (36,38)~(38,38) are used in Fig. 1
The information such as the numbering in filling information source or start context, the Quick Response Code totem culture solid colour of the position in a three-dimension code.
After removing dead zone, secondary witness marker, frame ID and revision ID, rectangular tiles number N=(n of data message is as carriedmax/mmin
)2-6(nmax/mmin)+7-nversion。
Data area：The rest position outside above-mentioned several regions is removed in code figure to be used for representing data.In Fig. 1, due to rule
Fixed every sheet containing is 4096bit data flows, then only represents 0 and 1 with black and white in (35,38).
In the present embodiment, some special frames are also with the addition of in the three-dimension code, including：In one group of Time Continuous
Quick Response Code head and the tail both ends startup frame sequence and terminate frame sequence, it is described startup frame sequence before initial alignment figure and
Isolation frame between Quick Response Code described in every two frame.Specifically：
Initial alignment figure：The image shown before three-dimension code player, compared to Figure 1, initial alignment figure is only had time
Area, other regions are black, and an as frame outermost one week is grey, the image that other parts are black.The region is used for
Deformation caused by quadrangle in correction space.
Start frame sequence：Triggering camera adopts the enabling signal of figure, can substitute generation successively by a series of black white images.
Isolate frame：The image of a black is inserted in two frame data frames, referred to as isolates frame.Because indicator screen refreshes
There is time delay in process, therefore transition state between two field pictures be present so that camera collects the image of a two frames superposition.Isolation
Frame can avoid the superposition of two data frames as buffer strip.In addition in three-dimension code playing process, the time delay for isolating frame is smaller than
The time delay of data frame.
Terminate frame sequence：Triggering camera, which terminates, adopts figure.Can be identical with starting frame.
In the decoding step of the present embodiment：
First have to carry out initial alignment.Because angle of inclination be present in screen and camera so that rectangle is sent out in the image of collection
Raw deformation, it is therefore desirable to be corrected to image.Before three-dimension code video playback, server end display shows that one is initially determined
Bit image, first pass through camera and gather the image, a rectangle frame is drawn in gray area and surrounds central data area, this process is not
It can cross the border.Handled by the perspective transform of decoding software, perspective transformation matrix, and the data frame that will be obtained afterwards can be got
Enter line translation according to the matrix.
With reference to figure 2, for the front and rear image of the frame Quick Response Code collected in the embodiment of the present invention.
After initial alignment, then the extraction of data frame is carried out, described data frame is namely loaded with the two of valid data
Tie up code.Due to isolating the presence of frame, the front and rear situation that gradual change occurs of a data two field picture is collected, as shown in Figure 2.It is logical
Cross observation, the extraction of data frame can use brightness ratio compared with method, by searching the most bright image between two " black figures ",
Extract the data frame between two isolation frames.Wherein brightness represents using the average of gradation of image, is used in the present invention
Gray count method is：
, it is necessary to sentence to carrying out color with coloured rectangle grid in data acquisition extraction process is carried out for Quick Response Code
Disconnected, in the present embodiment, the gray scale of the 8 kinds of each passages of color used employs 0 and 255 the two limiting values.Due to collection
There is certain aberration in image, therefore when judging each channel value, fixed threshold can be set and judge the value of each passage
Out.
In the image that actual camera collects, due to the interference of other color lumps around each color lump, therefore only take every
One fritter central area N × N (3≤N≤fritter length of side -6), average is taken to each passage in the central area.If the value of passage is less than
50 judge that its value is 0, and it is 255 that its value is judged higher than 200.
In the present embodiment, the positioning of extraction and Quick Response Code for frame ID, can be according to the property because frame ID regions are bar shaped
Matter judges whether first data frame rotates, and the anglec of rotation is recorded if rotating, and data frame afterwards is pressed and is somebody's turn to do
Angle rotates；Otherwise do not process.Generally master positioning mark is only needed to be positioned, secondary witness marker can be used to
Checking.
The color value in 1,2,3,4 areas is judged for A, B, C, D, getting frame ID=A*512+B*64+C*8+D, and by acquisition
Frame ID judges whether weight frame, frame losing compared with current frame counter.Give up the data frame if weight frame, weighed if frame losing
New collection.
By above-mentioned steps, the extraction of revision ID and data area is finally carried out, the information of revision ID typically only needs one
Secondary to extract, data area then needs to extract successively.The data of every image in 2 D code can advise according to the mask of response, error correction
Then handled, obtain original binary code stream, so as to be decoded.
With reference to figure 3, for the multi-media transmission system structural representation of the embodiment of the present invention.
The embodiment of the present invention additionally provides a kind of multi-media transmission system, and the system is applied such as institute in above-mentioned embodiment
The decoding method for the three-dimension code stated, it includes：
Server 301, for completing the coding step and showing the three-dimension code；
Image collecting device 302, for gathering the three-dimension code；
Client computer 303, for receiving the three-dimension code of described image harvester collection, and complete the decoding step
Suddenly.
Wherein, server 301 includes processor and Performance Monitor, and processor, which is used to handle, completes above-mentioned coding step
Suddenly, the three-dimension code is generated, and display is then used to be shown the three-dimension code, it is preferred that indicator screen refreshes frequency
Rate is more than or equal to 100Hz.
Image collecting device 302, preferably industrial camera, set when, by the time for exposure of the industrial camera with
The screen-refresh time of the display of the server 301 is arranged to consistent.Further, camera is initially opened, in three-dimension code
, it is necessary to make white balance processing before the broadcasting of video, to reduce the aberration of the image collected.
Client computer 303 can enter row data communication with image collecting device 302, receive described image harvester 302 and adopt
The three-dimension code of collection, and the decoding step is completed, finally obtain the multimedia information source being transmitted.
Based on described in above-described embodiment, the present invention specifically has following beneficial effect：
(1) medium of the optical signal as the multimedia transmission under non-physical connections is used, improves the security of transmission channel,
And encoded using colouring information, with data capacity of the conventional two-dimensional code-phase than improving single two-dimensional code image；Frame ID exists
Both ID is can recognize that in three-dimension code, also can be as the location information of Quick Response Code；
(2) major-minor witness marker is proposed, when frame ID region divisions are less, it is only necessary to master positioning mark, if frame ID
Region division is more, and secondary witness marker can complete auxiliary positioning；
(3) presence of initial alignment figure only needs one-time positioning, can correct the shape of two-dimension code area in remainder data frame
Distortion；
(4) gray scale of the 8 kinds of each passages of color used employs 0 and 255 the two limiting values, from a little aberration of generation
It is rapider to recover original color lump in collection image；
(5) special isolation frame is inserted during coding transmission, solves display brightness regression phenomenon to receiving terminal image
Frame alignment interference problem, guarantee is provided to be correctly decoded in next step.
Those of ordinary skills in the art should understand that：The specific embodiment of the present invention is the foregoing is only, and
The limitation present invention is not used in, within the spirit and principles of the invention, any modification, equivalent substitution and improvements done etc.,
It should be included within protection scope of the present invention.
Claims (6)
- A kind of 1. decoding method of three-dimension code, it is characterised in that the three-dimension code is made up of the Quick Response Code of one group of Time Continuous, Methods described includes：Coding step：Multimedia source files are encoded and are converted to binary code stream；The binary code stream is subjected to cutting according to the capacity of Quick Response Code every described；According to cutting result, every Quick Response Code use is filled with coloured rectangle grid；Added respectively at the head and the tail both ends of the Quick Response Code of one group of Time Continuous and start frame sequence and terminate frame sequence, described Initial alignment figure, and the addition isolation frame between Quick Response Code described in every two frame are added before starting frame sequence, ultimately generates institute State three-dimension code；Wherein, the startup frame sequence and termination frame sequence are one group of alternate image of black and white, are adopted for triggering image IMAQ of the acquisition means to the three-dimension code；The initial alignment figure be a frame outermost one week be grey, other parts be The image of black；The isolation frame is a frame black color image；Decoding step：Image rectification is carried out using the initial alignment figure；Data acquisition extraction is carried out to Quick Response Code described in every frame in the three-dimension code, to isolating described in any two between frame Image is gathered, by brightness comparative approach, the effective Quick Response Code is extracted, obtains the original binary code stream, go forward side by side Row decoding obtains the multimedia source files.
- 2. according to the method for claim 1, it is characterised in that the Quick Response Code includes：Positioned at image outermost one week Dead zone, positioned at the revision ID of one apex of image, positioned at the secondary witness marker of other apexes of image, positioned at image border Master positioning mark.
- 3. according to the method for claim 1, it is characterised in that the coloured rectangle grid of band passes through R, G, B tri- Passage represents eight kinds of different colors, and the gray scale of each passage uses 0 and 255 two extreme value.
- 4. according to the method for claim 2, it is characterised in that the master positioning is masked as strip；In the decoding step In rapid, further comprise：Judge whether first Quick Response Code rotates by the master positioning mark, the anglec of rotation is recorded if rotating Degree, and the Quick Response Code afterwards is rotated by the angle, if it is not, not processing then.
- 5. a kind of multi-media transmission system, it is characterised in that the system is applied as described in Claims 1-4 any one The decoding method of three-dimension code, including：Server, for completing the coding step and showing the three-dimension code；Image collecting device, for gathering the three-dimension code；Client computer, for receiving the three-dimension code of described image harvester collection, and complete the decoding step.
- 6. system according to claim 5, it is characterised in that described image harvester is industrial camera；The service The indicator screen refreshing frequency of device is more than or equal to 100Hz, the time for exposure of the industrial camera and the display of the server The screen-refresh time consistency of device；When carrying out the decoding step, the industrial camera carries out white balance processing first.
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| CN108234065B (en) * | 2016-12-15 | 2021-04-30 | 中国电信股份有限公司 | Augmented reality content transmission method and system |
| CN110225027B (en) * | 2019-06-06 | 2021-11-26 | 贵州华云创谷科技有限公司 | Method and system for unidirectional data ferry between isolation networks based on three-dimensional code technology |
| CN114998454B (en) * | 2022-05-09 | 2023-05-16 | 西南交通大学 | Dynamic multi-color code generation and analysis method |
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