CN109146759A - A kind of forming method, device, medium and the equipment of figure watermark - Google Patents
A kind of forming method, device, medium and the equipment of figure watermark Download PDFInfo
- Publication number
- CN109146759A CN109146759A CN201810810846.XA CN201810810846A CN109146759A CN 109146759 A CN109146759 A CN 109146759A CN 201810810846 A CN201810810846 A CN 201810810846A CN 109146759 A CN109146759 A CN 109146759A
- Authority
- CN
- China
- Prior art keywords
- watermark
- ciphertext
- graphic element
- information
- decoding table
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T1/00—General purpose image data processing
- G06T1/0021—Image watermarking
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/60—Editing figures and text; Combining figures or text
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T2201/00—General purpose image data processing
- G06T2201/005—Image watermarking
- G06T2201/0062—Embedding of the watermark in text images, e.g. watermarking text documents using letter skew, letter distance or row distance
Abstract
The present invention provides forming method, device, medium and the equipment of a kind of figure watermark.The method, comprising: determine the graphic element for forming figure ciphertext；Based on the decoding table pre-established, repetition and combination operation are carried out to the graphic element, form the corresponding figure ciphertext of cipher-text information；It is required according to watermark information, the figure ciphertext is arranged, form the watermark of ciphertext figure.Figure ciphertext is formed by using graphic element, further according to watermark information requirement, figure ciphertext is arranged, forms the watermark of ciphertext figure, can not only make watermark information that there is confidentiality, and watermark prompt can be played the role of；In addition, when the cipher-text information leakage in watermark, it can be according to decoding table tracing information leakage person.
Description
Technical field
The present invention relates to field of information security technology, and in particular to a kind of forming method of figure watermark, device, medium and
Equipment.
Background technique
Watermark in the prior art is mostly visible plaintext watermark, and watermark information can recognize, and watermark is obvious, is not only easy
Watermark information is revealed, and vision is be easy to cause to interfere.In addition, there are also blind watermatking, naked eyes invisible watermark, letters in the prior art
Breath holder is often unaware of the presence of watermark information, cannot effectively play the suggesting effect of watermark.
Summary of the invention
For the defects in the prior art, the present invention provides the forming method of figure watermark a kind of, device, medium and sets
It is standby, it can not only make watermark information that there is confidentiality, and watermark prompt can be played the role of.
In a first aspect, the present invention provides a kind of forming methods of figure watermark, comprising:
Determine the graphic element for forming figure ciphertext；
Based on the decoding table pre-established, repetition and combination operation are carried out to the graphic element, form cipher-text information pair
The figure ciphertext answered；
It is required according to watermark information, the figure ciphertext is arranged, form the watermark of ciphertext figure.
Optionally, the graphic element, comprising: flag bit graphic element and primary graphic element；
The flag bit graphic element is different from the graphics shape of the primary graphic element.
Optionally, based on the decoding table pre-established, the graphic element repeat and combination operation, formation are close
Before the step of literary information corresponding figure ciphertext, further includes:
Multiple primary graphic elements repeat and permutation and combination, a variety of different figures of formation combine；
A corresponding alphabetic character every kind of figure is combined, generates decoding table；Wherein, recording in the decoding table has
Flag bit graphic element.
Optionally, described based on the decoding table pre-established, repetition and combination operation are carried out to the graphic element, formed
The corresponding figure ciphertext of cipher-text information, comprising:
Based on the decoding table pre-established, repetition and combination operation, formation and ciphertext are carried out to the primary graphic element
The corresponding graph text information of information；
The flag bit graphic element is added respectively at the start-stop both ends of every information of the graph text information, forms figure
Ciphertext.
Optionally, the flag bit graphic element is the graphic element uniquely determined.
Optionally, the watermark information requirement, comprising: in watermark patterns, watermark location, watermark size and watermark color
It is one or more.
Second aspect, the present invention provide a kind of formation device of figure watermark, comprising:
Element determining module, for determining the graphic element for forming figure ciphertext；
Picture and text form module, for carrying out repeating and combining behaviour to the graphic element based on the decoding table pre-established
Make, forms the corresponding figure ciphertext of cipher-text information；
Watermark forms module and arranges for requiring according to watermark information the figure ciphertext, forms ciphertext figure
Watermark.
Optionally, the graphic element, comprising: flag bit graphic element and primary graphic element；
The flag bit graphic element is different from the graphics shape of the primary graphic element.
Optionally, described device, further includes:
Figure composite module, for carrying out repetition and permutation and combination to multiple primary graphic elements, formation is a variety of not
Same figure combination；
Decoding table generation module generates decoding table for every kind of figure combining a corresponding alphabetic character；Its
In, record has flag bit graphic element in the decoding table.
Optionally, the picture and text form module, comprising:
Graph text information forms unit, for being repeated to the primary graphic element based on the decoding table pre-established
And combination operation, form graph text information corresponding with cipher-text information；
Figure ciphertext forms unit, and the mark is added at the start-stop both ends for every information in the graph text information respectively
Will bit pattern element forms figure ciphertext.
Optionally, the flag bit graphic element is the graphic element uniquely determined.
In a specific embodiment provided by the invention, the watermark information requirement, comprising: watermark patterns, watermark bit
It sets, one of watermark size and watermark color or a variety of.
The third aspect, the present invention provide a kind of computer readable storage medium, are stored thereon with computer program, the program
The forming method of one of first aspect figure watermark is realized when being executed by processor.
Fourth aspect, the present invention provide a kind of formation equipment of figure watermark, comprising: memory, processor and are stored in
On memory and the computer program that can run on a processor, the processor are realized in first aspect when executing described program
A kind of figure watermark forming method.
The present invention provides a kind of forming method of figure watermark, forms figure ciphertext by using graphic element, further according to
Watermark information requirement, arranges figure ciphertext, forms the watermark of ciphertext figure, and watermark information can not only be made to have secrecy
Property, and watermark prompt can be played the role of；In addition, can be chased after according to decoding table when the cipher-text information leakage in watermark
Trace back information leakage person.
Formation device, a kind of computer readable storage medium and a kind of figure water of a kind of figure watermark provided by the invention
The formation equipment of print, it is having the same beneficial to effect with a kind of above-mentioned forming method of figure watermark for identical inventive concept
Fruit.
Detailed description of the invention
It, below will be to specific in order to illustrate more clearly of the specific embodiment of the invention or technical solution in the prior art
Embodiment or attached drawing needed to be used in the description of the prior art are briefly described.In all the appended drawings, similar element
Or part is generally identified by similar appended drawing reference.In attached drawing, each element or part might not be drawn according to actual ratio.
Fig. 1 is a kind of flow chart of the forming method of figure watermark provided by the invention；
Fig. 2 is a kind of schematic diagram of figure ciphertext provided by the invention；
Fig. 3 is a kind of schematic diagram of the formation device of figure watermark provided by the invention.
Specific embodiment
It is described in detail below in conjunction with embodiment of the attached drawing to technical solution of the present invention.Following embodiment is only used for
Clearly illustrate technical solution of the present invention, therefore be intended only as example, and cannot be used as a limitation and limit protection of the invention
Range.
It should be noted that unless otherwise indicated, technical term or scientific term used in this application should be this hair
The ordinary meaning that bright one of ordinary skill in the art are understood.
The present invention provides forming method, device, medium and the equipment of a kind of figure watermark.With reference to the accompanying drawing to this hair
Bright embodiment is illustrated.
Referring to FIG. 1, Fig. 1 is a kind of flow chart of the forming method for figure watermark that the specific embodiment of the invention provides,
A kind of forming method of figure watermark provided in this embodiment, comprising:
Step S101: the graphic element for forming figure ciphertext is determined.
Step S102: based on the decoding table pre-established, the graphic element repeat and combination operation, formation are close
The corresponding figure ciphertext of literary information.
Step S103: requiring according to watermark information, arranges the figure ciphertext, forms the watermark of ciphertext figure.
Figure ciphertext is formed by using graphic element, further according to watermark information requirement, figure ciphertext is arranged, shape
It at ciphertext figure watermark, can not only make watermark information that there is confidentiality, and watermark prompt can be played the role of；In addition,
It, can be according to decoding table tracing information leakage person when the cipher-text information leakage in watermark.
Wherein, graphic element may include: flag bit graphic element and primary graphic element.Wherein, flag bit pattern primitive
Element is different from the graphics shape of primary graphic element, that is to say, cannot repeat with primary graphic element.
Wherein, the unlimited shape of graphic element, pattern, size and color.
Wherein, primary graphic element can have multiple, and specific number selects on demand.Flag bit graphic element can be set into
The graphic element uniquely determined differentiates ciphertext sentence convenient for confirmation.
Cipher-text information refers to information implying in watermark, needing to transmit.For example, the telephone number of document holder, surname
Name, company name, department's information etc..
Figure ciphertext refers to the corresponding graphic element combination of cipher-text information.
Ciphertext figure watermark refers to the watermark eventually formed.
In a specific embodiment provided by the invention, based on the decoding table pre-established, to the graphic element
Before the step of repeat and combination operation, forming cipher-text information corresponding figure ciphertext, further includes: to multiple described basic
Graphic element repeat and permutation and combination, a variety of different figures of formation combine；Every kind of figure combination is one corresponding
Alphabetic character generates decoding table；Wherein, record has flag bit graphic element in the decoding table.
It before forming figure ciphertext, needs to establish decoding table, the corresponding figure of each alphabetic character is had recorded in decoding table
The specific graphic structure of shape combination and flag bit graphic element.
Wherein, flag bit graphic element is used to indicate that the beginning and termination of cipher-text information.Primary graphic element
It is used to indicate that specific cipher-text information.
Different alphabetic character information can be referred to by quantity and the permutation and combination variation of primary graphic element.
When determining that the corresponding figure of each alphabetic character combines, firstly, it is necessary to determine the corresponding figure of each alphabetic character
Shape element number；Then, the graphic element that corresponding number is selected from multiple primary graphic elements, is arranged with certain rule
Combination guarantees that different literals character corresponds to different figure combinations, wherein can have duplicate fundamental figure member in figure combination
Element；Finally, again corresponding figure combination with alphabetic character, and corresponding table is stored in decoding table.
For example, oblique line is mark bit map as shown in Fig. 2, square and four kinds of different triangles are five kinds of primary graphic elements
Shape element determines the corresponding alphabetic character of two primary graphic elements, then two primary graphic elements represent in figure ciphertext
One alphabetic character, the figure ciphertext represent three alphabetic characters altogether.
Preferably, the corresponding figure combination of each alphabetic character is made of four primary graphic elements, primary graphic element
There can be ten graphic elements, in this manner it is possible to cover more than 5,000 alphabetic characters, can satisfy the use of cipher-text information.
In a specific embodiment provided by the invention, based on the decoding table pre-established, to the graphic element into
Row repeats and combination operation, forms the corresponding figure ciphertext of cipher-text information, comprising: based on the decoding table pre-established, to described
Primary graphic element carries out repetition and combination operation, forms graph text information corresponding with cipher-text information；In the graph text information
The flag bit graphic element is added at the start-stop both ends of every information respectively, forms figure ciphertext.
Graph text information refers to the combination of the corresponding primary graphic element of cipher-text information.
Based on decoding table, the process of figure ciphertext is formed:
Firstly, obtaining cipher-text information；Then, it is corresponding to search each alphabetic character in cipher-text information one by one in decoding table
Figure combination；Further according to the figure combination of lookup, repetition and combination operation, formation and cipher-text information are carried out to primary graphic element
Corresponding graph text information；Finally, in cipher-text information the corresponding graph text information of every information beginning and end both ends, add respectively
Mark-on will bit pattern element indicates in short to terminate, and then forms figure ciphertext.
Wherein, flag bit graphic element occurs in pairs, to indicate the beginning and end of a word.
As shown in Fig. 2, oblique line is flag bit graphic element in figure ciphertext, the primary graphic element among oblique line is indicated
Cipher-text information, oblique line do not represent any alphabetic character.
In the present invention, it finally needs to arrange the figure ciphertext according to watermark information requirement, forms ciphertext graph
Shape watermark.
Wherein, watermark information requirement, may include: in watermark patterns, watermark location, watermark size, watermark color etc.
It is one or more.
If without watermark information requirement, the watermark of ciphertext figure can also be used directly.
When there is watermark information requirement, need to form corresponding pattern according to requiring to arrange figure ciphertext, be placed on
Corresponding position etc..For example, carrying out a certain number of repeated arrangements to figure ciphertext, the LOGO figure of certain enterprise is formed.In this way,
It can make ciphertext figure watermark that there is multilayer meaning.
The cipher-text information implied in the watermark of ciphertext figure in the present invention, needs decoding table that could identify, not decoding table
User sees that the watermark of ciphertext figure cannot obtain cipher-text information, not will cause unnecessary information leakage, once information leakage, it can
To trace blabber by decoding table, and then play the role of psychology fright and retrospect of divulging a secret.
More than, it is a kind of forming method of figure watermark provided by the invention.
Corresponding based on inventive concept identical with a kind of above-mentioned forming method of figure watermark, the present invention is real
It applies example and additionally provides a kind of formation device of figure watermark, as shown in Figure 3.Implement since Installation practice is substantially similar with method
Example, so describing fairly simple, the relevent part can refer to the partial explaination of embodiments of method.
A kind of formation device of figure watermark provided by the invention, comprising:
Element determining module 101, for determining the graphic element for forming figure ciphertext；
Picture and text form module 102, for based on the decoding table pre-established, the graphic element being repeated and being combined
Operation forms the corresponding figure ciphertext of cipher-text information；
Watermark forms module 103 and arranges for requiring according to watermark information the figure ciphertext, forms ciphertext
Figure watermark.
Wherein, the graphic element, comprising: flag bit graphic element and primary graphic element；
The flag bit graphic element is different from the graphics shape of the primary graphic element.
In a specific embodiment provided by the invention, described device, further includes:
Figure composite module, for carrying out repetition and permutation and combination to multiple primary graphic elements, formation is a variety of not
Same figure combination；
Decoding table generation module generates decoding table for every kind of figure combining a corresponding alphabetic character；Its
In, record has flag bit graphic element in the decoding table.
In a specific embodiment provided by the invention, the picture and text form module 102, comprising:
Graph text information forms unit, for being repeated to the primary graphic element based on the decoding table pre-established
And combination operation, form graph text information corresponding with cipher-text information；
Figure ciphertext forms unit, and the mark is added at the start-stop both ends for every information in the graph text information respectively
Will bit pattern element forms figure ciphertext.
In a specific embodiment provided by the invention, the flag bit graphic element is the pattern primitive uniquely determined
Element.
In a specific embodiment provided by the invention, the watermark information requirement, comprising: watermark patterns, watermark bit
It sets, one of watermark size and watermark color or a variety of.
More than, it is a kind of formation device of figure watermark provided by the invention.
Corresponding based on inventive concept identical with a kind of above-mentioned forming method of figure watermark, the present invention is real
It applies example and additionally provides a kind of computer readable storage medium, be stored thereon with computer program, when which is executed by processor
Realize a kind of forming method of above-mentioned figure watermark.
As shown from the above technical solution, computer readable storage medium provided in this embodiment, can be in the control of processor
Under system, figure ciphertext is formed using graphic element, is required according to watermark information, figure ciphertext is arranged, forms ciphertext graph
Shape watermark can not only make watermark information have confidentiality, and can play the role of watermark prompt；In addition, when in watermark
Cipher-text information leakage when, can be according to decoding table tracing information leakage person.
Corresponding based on inventive concept identical with a kind of above-mentioned forming method of figure watermark, the present invention is real
It applies example and additionally provides a kind of formation equipment of figure watermark, comprising: memory, processor and storage on a memory and can located
The computer program run on reason device, the processor realize a kind of formation side of above-mentioned figure watermark when executing described program
Method.
As shown from the above technical solution, the formation equipment of a kind of figure watermark provided in this embodiment, by using figure
Element forms figure ciphertext, further according to watermark information requirement, arranges figure ciphertext, forms the watermark of ciphertext figure, not only
It can make watermark information that there is confidentiality, and watermark prompt can be played the role of；In addition, the cipher-text information in watermark is let out
It, can be according to decoding table tracing information leakage person when dew.
In specification of the invention, numerous specific details are set forth.It is to be appreciated, however, that the embodiment of the present invention can be with
It practices without these specific details.In some instances, well known method, structure and skill is not been shown in detail
Art, so as not to obscure the understanding of this specification.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme should all cover within the scope of the claims and the description of the invention.
Claims (9)
1. a kind of forming method of figure watermark characterized by comprising
Determine the graphic element for forming figure ciphertext；
Based on the decoding table pre-established, the graphic element repeat and combination operation, formation cipher-text information are corresponding
Figure ciphertext；
It is required according to watermark information, the figure ciphertext is arranged, form the watermark of ciphertext figure.
2. the method according to claim 1, wherein the graphic element, comprising: flag bit graphic element and base
This graphic element；
The flag bit graphic element is different from the graphics shape of the primary graphic element.
3. according to the method described in claim 2, it is characterized in that, based on the decoding table pre-established, to the pattern primitive
Before the step of element repeat and combination operation, forms cipher-text information corresponding figure ciphertext, further includes:
Multiple primary graphic elements repeat and permutation and combination, a variety of different figures of formation combine；
A corresponding alphabetic character every kind of figure is combined, generates decoding table；Wherein, record has mark in the decoding table
Bit pattern element.
4. according to the method described in claim 2, it is characterized in that, described based on the decoding table pre-established, to the figure
Element carries out repetition and combination operation, forms the corresponding figure ciphertext of cipher-text information, comprising:
Based on the decoding table pre-established, repetition and combination operation, formation and cipher-text information are carried out to the primary graphic element
Corresponding graph text information；
The flag bit graphic element is added respectively at the start-stop both ends of every information of the graph text information, and it is close to form figure
Text.
5. according to the method described in claim 2, it is characterized in that, the flag bit graphic element is the pattern primitive uniquely determined
Element.
6. the method according to claim 1, wherein the watermark information requires, comprising: watermark patterns, watermark
One of position, watermark size and watermark color are a variety of.
7. a kind of formation device of figure watermark characterized by comprising
Element determining module, for determining the graphic element for forming figure ciphertext；
Picture and text form module, for carrying out repetition and combination operation, shape to the graphic element based on the decoding table pre-established
At the corresponding figure ciphertext of cipher-text information；
Watermark forms module and arranges for requiring according to watermark information the figure ciphertext, forms ciphertext figure water
Print.
8. a kind of computer readable storage medium, is stored thereon with computer program, which is characterized in that the program is held by processor
Method described in one of claim 1-6 is realized when row.
9. a kind of formation equipment of figure watermark, comprising: memory, processor and storage are on a memory and can be on a processor
The computer program of operation, which is characterized in that the processor is realized described in one of claim 1-6 when executing described program
Method.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810846.XA CN109146759A (en) | 2018-07-23 | 2018-07-23 | A kind of forming method, device, medium and the equipment of figure watermark |
| PCT/CN2019/094587 WO2020019957A1 (en) | 2018-07-23 | 2019-07-03 | Method for forming graphic watermark, apparatus, medium and device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810810846.XA CN109146759A (en) | 2018-07-23 | 2018-07-23 | A kind of forming method, device, medium and the equipment of figure watermark |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN109146759A true CN109146759A (en) | 2019-01-04 |
Family
ID=64801368
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810810846.XA Pending CN109146759A (en) | 2018-07-23 | 2018-07-23 | A kind of forming method, device, medium and the equipment of figure watermark |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN109146759A (en) |
| WO (1) | WO2020019957A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110069942A (en) * | 2019-03-18 | 2019-07-30 | 广州多益网络股份有限公司 | Watermark embedding method, device, equipment and computer readable storage medium |
| WO2020019957A1 (en) * | 2018-07-23 | 2020-01-30 | 深圳市联软科技股份有限公司 | Method for forming graphic watermark, apparatus, medium and device |
| CN113496451A (en) * | 2020-04-07 | 2021-10-12 | 奇安信科技集团股份有限公司 | Watermark adding method and device and screen image leakage tracking method and device |
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| US20050169498A1 (en) * | 2004-02-02 | 2005-08-04 | Samsung Electronics Co., Ltd. | Apparatus and method for watermarking digital image |
| CN107610038A (en) * | 2017-09-29 | 2018-01-19 | 新华三技术有限公司 | The display methods of watermark, apparatus and system |
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| US9299119B2 (en) * | 2014-02-24 | 2016-03-29 | Disney Enterprises, Inc. | Overlay-based watermarking for video synchronization with contextual data |
| CN103824006B (en) * | 2014-03-12 | 2016-06-29 | 中国科学院信息工程研究所 | A kind of mobile phone application software automatically generates the method and system of watermark |
| CN104517046A (en) * | 2014-12-24 | 2015-04-15 | 江苏敏捷科技股份有限公司 | Screen display data protection method |
| CN109146759A (en) * | 2018-07-23 | 2019-01-04 | 深圳市联软科技股份有限公司 | A kind of forming method, device, medium and the equipment of figure watermark |
-
2018
- 2018-07-23 CN CN201810810846.XA patent/CN109146759A/en active Pending
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2019
- 2019-07-03 WO PCT/CN2019/094587 patent/WO2020019957A1/en active Application Filing
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050169498A1 (en) * | 2004-02-02 | 2005-08-04 | Samsung Electronics Co., Ltd. | Apparatus and method for watermarking digital image |
| CN107610038A (en) * | 2017-09-29 | 2018-01-19 | 新华三技术有限公司 | The display methods of watermark, apparatus and system |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020019957A1 (en) * | 2018-07-23 | 2020-01-30 | 深圳市联软科技股份有限公司 | Method for forming graphic watermark, apparatus, medium and device |
| CN110069942A (en) * | 2019-03-18 | 2019-07-30 | 广州多益网络股份有限公司 | Watermark embedding method, device, equipment and computer readable storage medium |
| CN110069942B (en) * | 2019-03-18 | 2021-01-19 | 广州多益网络股份有限公司 | Watermark embedding method, device, equipment and computer readable storage medium |
| CN113496451A (en) * | 2020-04-07 | 2021-10-12 | 奇安信科技集团股份有限公司 | Watermark adding method and device and screen image leakage tracking method and device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2020019957A1 (en) | 2020-01-30 |
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