CN108958687A - A kind of picture transmission method based on electronic whiteboard - Google Patents
A kind of picture transmission method based on electronic whiteboard Download PDFInfo
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- CN108958687A CN108958687A CN201810814591.4A CN201810814591A CN108958687A CN 108958687 A CN108958687 A CN 108958687A CN 201810814591 A CN201810814591 A CN 201810814591A CN 108958687 A CN108958687 A CN 108958687A
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- value
- line segment
- electronic whiteboard
- picture
- point
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/14—Digital output to display device ; Cooperation and interconnection of the display device with other functional units
- G06F3/1454—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay
- G06F3/1462—Digital output to display device ; Cooperation and interconnection of the display device with other functional units involving copying of the display data of a local workstation or window to a remote workstation or window so that an actual copy of the data is displayed simultaneously on two or more displays, e.g. teledisplay with means for detecting differences between the image stored in the host and the images displayed on the remote displays
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- Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Compression Of Band Width Or Redundancy In Fax (AREA)
Abstract
The invention discloses a kind of picture transmission methods based on electronic whiteboard, the present invention is in order to improve efficiency of transmission, allow both sides that can faster receive the information of other side, originally needed the picture transmitted by intercept method be modified as transmission flag data, it is big that picture volume can thus be reduced, avoid the too long problem of transmission time, in this way, when both sides are connected to another party's data, continuation is drawn in original image using flag data, for data, through overcompression, data volume can also greatly reduce, when drawing one section of irregular mark line, data volume a little is reduced by the way of matched curve.
Description
Technical field
The invention belongs to field of information interaction, and in particular to a kind of picture transmission method based on electronic whiteboard.
Background technique
Traditional label picture transmission method is that the picture marked is issued an other side by a side, in the excessive feelings of picture
Under condition, efficiency of transmission will be relatively slow.
Summary of the invention
The purpose of the present invention is to overcome the above shortcomings and to provide a kind of picture transmission methods based on electronic whiteboard, can
Picture is transmitted rapidly and efficiently.
In order to achieve the above object, the present invention the following steps are included:
Step 1 determines the consistency of the picture between different electronic whiteboards, such as identical, then carries out in next step；Such as difference,
Then unify the picture between each electronic whiteboard；
Step 2, the drawing image on the electronic whiteboard of transmitting terminal；
The image of drafting is truncated step 3, and if define do, line segment is split by intercept method, really
Determine the line segment length and angle between consecutive points；
Line segment length between consecutive points is sent on the electronic whiteboard of receiving end by step 4 with angle；
Step 5 carries out on picture after the electronic whiteboard of receiving end receives line segment length and angle between consecutive points
Positioning, and line segment is recombinated by matched curve method, draw out image；
Step 6, after all electronic whiteboards complete drawing image, return step one.
In step 3, split to line segment by intercept method is to calculate truncation with rule by the statistics to point, to phase
Adjacent each point is calculated and is classified, and using classification method, is calculated between adjacent two o'clock or 3 points and multiple spot, specifically
Method is as follows:
The first step, using clustering algorithm classification point, the x value and y value put, the point in a classification calculates separately more
A curve matching；
Second step, if x value is identical between two o'clock, y value is not identical, then the disengaged position between curve and curve, according to
Disengaged position obtains line segment length and angle between consecutive points.
X value is identical, and the different situation of y value is divided into two kinds:
The first, for x value error within two pixels, then it is identical to be considered as x value, and calculation formula is | x2-x1|≤2
Second, x value is error free, then x value is identical.
In step 5, recombinated that specific step is as follows to line segment by matched curve method:
The first step, curve matching are a variety of curve forms, and polynomial expression is,
Pn(x)=anxn+an-1xn-1+…+a1x+a0
The polynomial expression is obtained by constant and independent variable x by limited times multiplication and add operation, wherein works as n
It is linear function y=kx+b when=1, is quadratic function y=ax as n=22+ bx+c, and so on, it obtains primary
Function, quadratic function and cubic function；
Second step is fitted evaluation function:
Wherein, w is the coefficient in multinomial, and t is actual point y value；
Linear function, quadratic function and cubic function are fitted respectively, calculate error using fitting evaluation function, and
Threshold value；
Line segment length between the consecutive points received is brought into fitting evaluation function with angle and calculates error, if error is small
In threshold value, then it is fitted to curve, if error is greater than threshold value, cancels fitting, graphical pointv.
Compared with prior art, the present invention allows both sides that can faster receive the letter of other side to improve efficiency of transmission
Breath, originally needing the picture transmitted to be modified as transmitting flag data by intercept method, it is big thus to reduce picture volume, keeps away
The too long problem of transmission time is exempted from, in this way, when both sides are connected to another party's data, continuation makes in original image
It is drawn with flag data, for data, through overcompression, data volume can also greatly reduce, irregular in one section of picture
When mark line, data volume a little is reduced by the way of matched curve.
Detailed description of the invention
Fig. 1 is the schematic diagram of intercept method in the present invention.
Specific embodiment
The present invention will be further described with reference to the accompanying drawing.
The present invention the following steps are included:
Step 1 determines the consistency of the picture between different electronic whiteboards, such as identical, then carries out in next step；Such as difference,
Then unify the picture between each electronic whiteboard；
Step 2, the drawing image on the electronic whiteboard of transmitting terminal；
The image of drafting is truncated step 3, and if define do, line segment is split by intercept method, really
Determine the line segment length and angle between consecutive points；
Line segment length between consecutive points is sent on the electronic whiteboard of receiving end by step 4 with angle；
Step 5 carries out on picture after the electronic whiteboard of receiving end receives line segment length and angle between consecutive points
Positioning, and line segment is recombinated by matched curve method, draw out image；
Step 6, after all electronic whiteboards complete drawing image, return step one.
In step 3, split to line segment by intercept method is to calculate truncation with rule by the statistics to point, to phase
Adjacent each point is calculated and is classified, and using classification method, is calculated between adjacent two o'clock or 3 points and multiple spot, specifically
Method is as follows:
The first step, using clustering algorithm classification point, the x value and y value put, the point in a classification calculates separately more
A curve matching；
Second step, if x value is identical between two o'clock, y value is not identical, then the disengaged position between curve and curve, according to
Disengaged position obtains line segment length and angle between consecutive points.
X value is identical, and the different situation of y value is divided into two kinds:
The first, for x value error within two pixels, then it is identical to be considered as x value, and calculation formula is | x2-x1|≤2
Second, x value is error free, then x value is identical.
In step 5, recombinated that specific step is as follows to line segment by matched curve method:
The first step, curve matching are a variety of curve forms, and polynomial expression is,
Pn(x)=anxn+an-1xn-1+…+a1x+a0
The polynomial expression is obtained by constant and independent variable x by limited times multiplication and add operation, wherein works as n
It is linear function y=kx+b when=1, is quadratic function y=ax as n=22+ bx+c, and so on, it obtains primary
Function, quadratic function and cubic function；
Second step is fitted evaluation function:
Wherein, w is the coefficient in multinomial, and t is actual point y value.
Linear function, quadratic function and cubic function are fitted respectively, calculate error using fitting evaluation function, and
Threshold value；Line segment length between the consecutive points received is brought into fitting evaluation function with angle and calculates error, if error
Less than threshold value, then it is fitted to curve, if error is greater than threshold value, cancels fitting, graphical pointv.
Referring to Fig. 1, when b point to all data of i point requires transmission, intercept method can be used, matched curve method, every three
A point can determine two lines section, and an angle, such as point h, point i and point p have determined line segment ih, line segment ip and an angle a, worked as angle
A is greater than 10 degree, and line segment ip length is greater than 4px, is truncated from point i, and b point to i point can omit b point to i point with matched curve method
Intermediate data, transmit two points and which omits point fitting algorithm, the data volume that such opposite receives will subtract significantly
It is few.
Claims (4)
1. a kind of picture transmission method based on electronic whiteboard, which comprises the following steps:
Step 1 determines the consistency of the picture between different electronic whiteboards, such as identical, then carries out in next step；Such as difference, then unite
Picture between one each electronic whiteboard；
Step 2, the drawing image on the electronic whiteboard of transmitting terminal；
The image of drafting is truncated step 3, and if define do, line segment is split by intercept method, determines phase
Line segment length and angle between adjoint point；
Line segment length between consecutive points is sent on the electronic whiteboard of receiving end by step 4 with angle；
Step 5 is positioned on picture after the electronic whiteboard of receiving end receives line segment length and angle between consecutive points,
And line segment is recombinated by matched curve method, draw out image；
Step 6, after all electronic whiteboards complete drawing image, return step one.
2. a kind of picture transmission method based on electronic whiteboard according to claim 1, which is characterized in that in step 3,
Split to line segment by intercept method is to calculate truncation by statistics to point and rule, adjacent each point calculate and
Classification, using classification method, is calculated, the specific method is as follows between adjacent two o'clock or 3 points and multiple spot:
The first step, using clustering algorithm classification point, the x value and y value put, the point in a classification calculate separately multiple songs
Line fitting；
Second step, if x value is identical between two o'clock, y value is not identical, then the disengaged position between curve and curve, according to separation
Position obtains line segment length and angle between consecutive points.
3. a kind of picture transmission method based on electronic whiteboard according to claim 2, which is characterized in that x value is identical, y
It is worth different situations and is divided into two kinds:
The first, for x value error within two pixels, then it is identical to be considered as x value, and calculation formula is | x2-x1|≤2
Second, x value is error free, then x value is identical.
4. a kind of picture transmission method based on electronic whiteboard according to claim 1, which is characterized in that in step 5,
Recombinated that specific step is as follows to line segment by matched curve method:
The first step, curve matching are a variety of curve forms, and polynomial expression is,
Pn(x)=anxn+an-1xn-1+…+a1x+a0
The polynomial expression is obtained by constant and independent variable x by limited times multiplication and add operation, wherein works as n=1
When, it is linear function y=kx+b, is quadratic function y=ax as n=22+ bx+c, and so on, obtain a letter
Number, quadratic function and cubic function；
Second step is fitted evaluation function:
Wherein, t is actual point y value；
Linear function, quadratic function and cubic function are fitted respectively, calculate error using fitting evaluation function, and determine
Threshold value；
Line segment length between the consecutive points received is brought into fitting evaluation function with angle and calculates error, if error is less than threshold
Value, then be fitted to curve, if error is greater than threshold value, cancels fitting, graphical pointv.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810814591.4A CN108958687A (en) | 2018-07-23 | 2018-07-23 | A kind of picture transmission method based on electronic whiteboard |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810814591.4A CN108958687A (en) | 2018-07-23 | 2018-07-23 | A kind of picture transmission method based on electronic whiteboard |
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| CN108958687A true CN108958687A (en) | 2018-12-07 |
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| CN201810814591.4A Pending CN108958687A (en) | 2018-07-23 | 2018-07-23 | A kind of picture transmission method based on electronic whiteboard |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109971A (en) * | 2010-12-14 | 2011-06-29 | 桂林电子科技大学 | Slide projector showing system capable of wirelessly transmitting plotting information |
| CN102170442A (en) * | 2011-04-25 | 2011-08-31 | 苏州阔地网络科技有限公司 | Safe synchronization method and system for electronic whiteboard based on community platform |
| CN105468208A (en) * | 2014-09-09 | 2016-04-06 | 深圳市鸿合创新信息技术有限责任公司 | Electronic whiteboard trace tracking method and apparatus |
| WO2017142690A1 (en) * | 2016-02-16 | 2017-08-24 | Arris Enterprises Llc | Statistical multiplexing with heterogeneous encoder pool |
-
2018
- 2018-07-23 CN CN201810814591.4A patent/CN108958687A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102109971A (en) * | 2010-12-14 | 2011-06-29 | 桂林电子科技大学 | Slide projector showing system capable of wirelessly transmitting plotting information |
| CN102170442A (en) * | 2011-04-25 | 2011-08-31 | 苏州阔地网络科技有限公司 | Safe synchronization method and system for electronic whiteboard based on community platform |
| CN105468208A (en) * | 2014-09-09 | 2016-04-06 | 深圳市鸿合创新信息技术有限责任公司 | Electronic whiteboard trace tracking method and apparatus |
| WO2017142690A1 (en) * | 2016-02-16 | 2017-08-24 | Arris Enterprises Llc | Statistical multiplexing with heterogeneous encoder pool |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20181207 |
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| RJ01 | Rejection of invention patent application after publication |