CN102682459A - Method for interpolating keyframe animation curve - Google Patents
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Abstract
The invention discloses a method for interpolating a keyframe animation curve, comprising a constant interpolation, a linear extrapolation and a keyframe linear extrapolation. The constant interpolation is carried out by directly using the numerical value of the keyframe when the interpolation mode marking amount of the keyframe is judged to be constant interpolation. The constant interpolation can be used for solving the problem that the numerical value of the previous keyframe needs to be maintained between two keyframes during practical application. The linear extrapolation is carried out by obtaining coordinates of first/final keyframes and front/rear control points and calculating a linear equation when the extrapolation mode marking amount of the keyframe is judged to be linear interpolation. The keyframe linear extrapolation is carried out by obtaining the coordinates of the first and the second keyframes or coordinates of the last two keyframes and calculating a linear equation. The linear extrapolation and the keyframe linear extrapolation overcome the defect that the conventional extrapolation method has only one constant extrapolation, thereby bringing more choices for users and better meeting the requirement during the practical application.
Description
Technical field
The present invention relates to compile montage software and look audio frequency later stage special effect processing and composite software field, be specifically related to the interpolation method of key-frame animation curve.
Background technology
Any animation will show motion or change, and front and back will provide two different key states at least, and the variation of intermediateness and linking computer can be accomplished automatically.Frame is the single width image frame of least unit in the animation, is equivalent to each the lattice camera lens on the cinefilm, and frame shows as lattice or a mark on the time shaft of animation software.The frame of expression key state is called key frame.The parameter of influential picture image all can become the parameter of key frame, like parameter of position, rotation angle, texture etc.The key frame technology is a most basic and utilization method the most widely in the computer animation.
Utilizing non-linear volume montage software and looking audio frequency later stage special effect processing and composite software, preparing advertising, in the process of film clips, film etc., often need to regulate parameters, key frame is being set, thereby forms the effect of a variation in time.Therefore the key-frame animation curve is a kind of regulating measure important and commonly used.Whether convenient and swift directly the having influence on of key-frame animation curve adjustment looked the efficient that audio frequency is made.
Article one, the key-frame animation curve is made up of each key frame and the curve between them; Form curve according to certain interpolation method between the key frame; Curve between the key frame can be divided three classes: Bezier; Linearity curve and constant curve, by the interpolation method decision of key frame, the curve outside the head and the tail key frame is determined by the extrapolation mode.The interpolation method of the key-frame animation curve of existing software generally has two kinds in Bezier and linear straight line.But in practical application, need between two key frames, keep the numerical value of previous key frame sometimes, at this moment the interpolation of Bezier and linear straight line can not be satisfied the demand.For the extrapolation mode, existing software generally only has the constant interpolation a kind of, can not satisfy the needs of practical application.
Summary of the invention
To the defective of prior art and the needs of practical application, the object of the present invention is to provide the interpolation method of key-frame animation curve, realize inserting in the key-frame animation curve variation with the extrapolation mode, better meet the needs of practical application.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is following:
The interpolation method of key-frame animation curve comprises the interpolating method of key-frame animation curve and the extrapolation method of key-frame animation curve, it is characterized in that:
Said interpolating method is meant in the constant and inserts; Its concrete grammar is: when timeline is played between certain key frame and its next key frame; Obtain the interpolating method sign amount of this key frame; If be judged as the constant interpolation through this sign amount, then obtain the coordinate figure of this key frame, directly use the numerical value of this key frame to carry out the constant interpolation;
Said extrapolation method comprises linear extrapolation and key frame linear extrapolation; The concrete mode of carrying out extrapolation is: during regional outside timeline is in two key frames of head and the tail; Obtain the extrapolation mode sign amount of key frame; If be judged as linear interpolation through this sign amount; Then obtain head/tail key frame and its preceding/back to the coordinate at reference mark, calculate linear equation, carry out linear interpolation; If be judged as the key frame linear interpolation, then obtain the coordinate of first key frame and second key frame or the coordinate of tail key frame and penult key frame, calculate linear equation, carry out the key frame linear interpolation.
Further, aforesaid interpolation method, the horizontal ordinate of said key-frame animation curve is the time, ordinate is the parameter value of stunt parameter.
Further, aforesaid interpolation method, said forward direction reference mark is meant the reference mark, front and back that is used for controlling the key frame of the plots changes of key frame end points both sides in the key-frame animation curve with the back to the reference mark.
Further, aforesaid interpolation method when carrying out linear extrapolation, when timeline during less than the time value of first key frame, then obtains the coordinate at first key frame and its forward direction reference mark, calculates linear equation, carries out linear interpolation; When timeline during greater than the time value of tail key frame, then obtain tail key frame and its back coordinate to the reference mark, calculate linear equation, carry out linear interpolation.
Further, aforesaid interpolation method when carrying out the key frame linear interpolation, when timeline during less than the time value of first key frame, then obtains the coordinate of first key frame and second key frame, calculates linear equation, carries out the key frame linear interpolation; When timeline during greater than the time value of tail key frame, obtain the coordinate of tail key frame and penult key frame, calculate linear equation, carry out the key frame linear interpolation.
Further again, aforesaid interpolation method, when carrying out linear extrapolation, when the time value at key frame and its reference mark was identical, the numerical value of linear extrapolation equated with the numerical value of key frame.
Further; Aforesaid interpolation method; When carrying out the key frame linear extrapolation; If when the coordinate of first key frame and second key frame or the time value of the tail key frame and the coordinate of penult key frame were identical, the value of key frame linear extrapolation equated with the numerical value of first key frame or tail key frame.
Effect of the present invention is: the present invention inserts in existing key-frame animation curve on the basis with extrapolation, has proposed new interior inserting and extrapolation method, promptly inserts in the constant, linear extrapolation and key frame linear extrapolation.The needs that need between two key frames, keep the numerical value of previous key frame in the practical application have been solved through inserting in the constant; Linear extrapolation and key frame linear extrapolation have overcome the single defective of only a kind of constant extrapolation of existing extrapolation method, for the user provides more choices, have better met the needs of practical application.
Description of drawings
Fig. 1 is the process flow diagram of slotting in carrying out through interpolation method according to the invention and extrapolation;
Fig. 2 is the process flow diagram of existing interpolating method;
Fig. 3 is the process flow diagram of existing extrapolation method;
Fig. 4 utilizes the method for the invention to carry out the synoptic diagram of linear extrapolation;
Fig. 5 utilizes the method for the invention to carry out the synoptic diagram of key frame linear extrapolation.
Embodiment
Through accompanying drawing and specific embodiment the present invention is done further description below.
Key frame key-frame animation curve is the curve that is formed according to certain interpolation method by key frame; Curve between the key frame can be divided three classes: Bezier; Linearity curve and constant curve, by the interpolation method decision of key frame, and the curve outside the head and the tail key frame is determined by the extrapolation mode.
In the interpolation method of existing key-frame animation curve, in be inserted with two kinds of Bei Saier curve and linear linear interpolations, extrapolation only has the constant interpolation a kind of.The key frame interpolation method of system default is the Bezier interpolation, and the extrapolation mode of the key-frame animation curve of system default is the constant interpolation
Fig. 2 shows the process flow diagram of interpolating method in the prior art, when carrying out key-frame animation curve interior slotting, all has the sign amount of an interpolation method on the interface of each key frame, the mode of inserting in showing.When timeline is played between certain key frame and its next key frame; System can at first obtain the interpolation method sign amount of this key frame, judges its interpolation method, if be judged as the Bezier interpolation; Then obtain this key frame and its forward direction reference mark coordinate; And next key frame back to the reference mark coordinate with it, calculate the equation of three Beziers, carry out the interpolation of Bezier; If be judged as linear interpolation, then obtain the coordinate of this key frame and next key frame, calculate both linear equations, carry out linear interpolation.Wherein, the reference mark is the notion in three Beziers, and promptly three Beziers are by an end points, the forward direction reference mark of this end points, second end points, second end points back to the reference mark, the determining positions of totally four points.So before and after end points is total to totally two reference mark.In the present invention, a key frame is exactly an end points, and it has front and back to two reference mark.
Fig. 3 shows the process flow diagram of extrapolation method in the prior art; When extrapolation is carried out in the zone outside timeline is in two key frames of head and the tail; If timeline is less than the time value of first key frame; Then read the first key frame coordinate of key-frame animation curve, the parameter values of timeline place time is identical with the numerical value of first key frame, remains unchanged; If timeline during greater than the time value of tail key frame, then reads the tail key frame coordinate of key-frame animation curve, the parameter values of timeline place time is identical with the numerical value of tail key frame, remains unchanged.
Be to realize inserting in the key-frame animation curve variation with the extrapolation mode, better meet the needs of practical application, the invention provides the interpolation method of key-frame animation curve, comprise in the constant insert, linear extrapolation and key frame linear extrapolation.Fig. 1 shows interpolation method through key-frame animation curve of the present invention and inserts the process flow diagram with extrapolation in carrying out.When in carrying out, inserting,, then read the coordinate of key frame, directly use the coordinate figure of key frame to carry out interpolation if be judged as in the constant and insert through reading key frame interpolation method sign amount.Selected the constant interpolation for certain key frame like this, then the parameter values between this key frame and its next key frame will remain unchanged.The constant interpolation is actually and has produced a kind of step signal, when timeline is played to next key frame, should be as the criterion with the numerical value of this key frame, at this moment will produce the saltus step of numerical value.
When carrying out extrapolation; At first through reading key frame extrapolation mode sign amount, if be judged as linear extrapolation, when carrying out linear extrapolation through this sign amount; When timeline during less than the time value of first key frame; Then obtain the coordinate at first key frame and its forward direction reference mark, calculate linear equation, carry out linear interpolation; When timeline during greater than the time value of tail key frame, then obtain tail key frame and its back coordinate to the reference mark, calculate linear equation, carry out linear interpolation.Fig. 4 shows and utilizes this method to carry out the synoptic diagram of linear extrapolation.By can finding out among the figure, during less than the time value of first key frame, obtain the coordinate of first key frame A and its forward direction reference mark B at timeline, just can calculate linear equation, carry out interpolation; At timeline during, then be retrieved as key frame C and its back coordinate to reference mark D carries out interpolation greater than the time value of tail key frame.Wherein, For first key frame is to overlap with the end points of key frame to the reference mark thereafter; The forward direction reference mark of tail key frame is to overlap with the end points of key frame, and the back of promptly first key frame A is the end points of key frame A to the reference mark, and the forward direction reference mark of tail key frame C is the end points of key frame C.For before the key frame/affirmation of back to the position, reference mark is existing known technology, repeat no more at this.
In linear extrapolation procedure, when the time value at key frame and its reference mark was identical, the slope of the linear equation that their are set up was with infinity, and for this special circumstances, system will make the numerical value of extrapolation equate with the numerical value of key frame.
If be judged as the key frame linear extrapolation through extrapolation mode sign amount; When carrying out the key frame linear extrapolation,, then obtain the coordinate of first key frame and second key frame when timeline during less than the time value of first key frame; Calculate linear equation, carry out the key frame linear interpolation; When timeline during greater than the time value of tail key frame, then obtain the coordinate of tail key frame and penult key frame, calculate linear equation, carry out the key frame linear interpolation.Fig. 5 shows and utilizes this method to carry out the synoptic diagram of key frame linear extrapolation.By can finding out among the figure, during less than the time value of first key frame,, just can calculate linear equation at timeline through obtaining the coordinate of first key frame E and second key frame F, carry out interpolation; During greater than the time value of tail key frame, then obtain the coordinate of tail key frame G and key frame H second from the bottom at timeline, carry out the key frame linear interpolation.
Equally, in the key frame linear extrapolation, when the time value of two key frames was identical, the slope of the linear equation that their are set up was with infinity, and for this special circumstances, system will make the numerical value of extrapolation equate with the numerical value of head (tail) key frame.
Wherein, it is an enumeration type variable that inside/outside is inserted mode sign amount, just can distinguish type through this enumerated variable, and the realization of this sign amount can have multiple mode.
For through calculating linear equation, carry out the linear extrapolation of linear extrapolation and key frame, linear equation is a prior art, is defined as y=f (x), f has following characteristic:
f(x+y)＝f(x)+f(y)；
F (ax)=af (x); Wherein, a is an arbitrary constant.
For the present invention, during less than the time value of first key frame, obtain the coordinate at first key frame and its forward direction reference mark with timeline, calculate linear equation, carrying out the first key frame of linear interpolation is example, and its accounting equation is (y
1-y
0)/(x
1-x
0)=(y
0-y
2)/(x
0-x
2);
Wherein, for linear interpolation x
0, y
0The horizontal ordinate of key frame respectively, x
1, y
1The horizontal ordinate at the forward direction reference mark of key frame respectively, x
2, y
2Be respectively the horizontal ordinate of extrapolation point;
For key frame linear interpolation x
0, y
0The horizontal ordinate of key frame respectively, x
1, y
1Be respectively the horizontal ordinate of second key frame, x
2, y
2Be respectively the horizontal ordinate of extrapolation point.
Obviously, those skilled in the art can carry out various changes and modification to the present invention and not break away from the spirit and scope of the present invention.Like this, belong within the scope of claim of the present invention and equivalent technology thereof if of the present invention these are revised with modification, then the present invention also is intended to comprise these changes and modification interior.
Claims (7)
1. the interpolation method of key-frame animation curve comprises the interpolating method of key-frame animation curve and the extrapolation method of key-frame animation curve, it is characterized in that:
Said interpolating method is meant in the constant and inserts; Its concrete grammar is: when timeline is played between certain key frame and its next key frame; Obtain the interpolation method sign amount of this key frame; If be judged as the constant interpolation through this sign amount, then obtain the coordinate figure of this key frame, directly use the coordinate figure of this key frame to carry out the constant interpolation;
Said extrapolation method comprises linear extrapolation and key frame linear extrapolation; The concrete mode of carrying out extrapolation is: during regional outside timeline is in two key frames of head and the tail; Obtain the extrapolation mode sign amount of key frame; If be judged as linear interpolation through this sign amount; Then obtain head/tail key frame and its preceding/back to the coordinate at reference mark, calculate linear equation, carry out linear interpolation; If be judged as the key frame linear interpolation, then obtain the coordinate of first key frame and second key frame or the coordinate of tail key frame and penult key frame, calculate linear equation, carry out the key frame linear interpolation.
2. interpolation method as claimed in claim 1 is characterized in that: the horizontal ordinate of said key-frame animation curve is the time, and ordinate is the parameter value of stunt parameter.
3. interpolation method as claimed in claim 1 is characterized in that: said forward direction reference mark is meant the reference mark, front and back that is used for controlling the key frame of the plots changes of key frame end points both sides in the key-frame animation curve with the back to the reference mark.
4. interpolation method as claimed in claim 1 is characterized in that: when carrying out linear extrapolation, when timeline during less than the time value of first key frame, then obtain the coordinate at first key frame and its forward direction reference mark, calculate linear equation, carry out linear interpolation; When timeline during greater than the time value of tail key frame, then obtain tail key frame and its back coordinate to the reference mark, calculate linear equation, carry out linear interpolation.
5. interpolation method as claimed in claim 1; It is characterized in that: when carrying out the key frame linear interpolation,, then obtain the coordinate of first key frame and second key frame when timeline during less than the time value of first key frame; Calculate linear equation, carry out the key frame linear interpolation; When timeline during greater than the time value of tail key frame, then obtain the coordinate of tail key frame and penult key frame, calculate linear equation, carry out the key frame linear interpolation.
6. according to claim 1 or claim 2 interpolation method is characterized in that: when carrying out linear extrapolation, when the time value at key frame and its reference mark was identical, the numerical value of linear extrapolation equated with the numerical value of key frame.
7. like claim 1 or 3 described interpolation methods; It is characterized in that: when carrying out the key frame linear extrapolation; If when the coordinate of first key frame and second key frame or the time value of the tail key frame and the coordinate of penult key frame were identical, the value of key frame linear extrapolation equated with the numerical value of first key frame or tail key frame.
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| CN201110061534.1A CN102682459B (en) | 2011-03-15 | The interpolation method of key-frame animation curve |
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| CN201110061534.1A CN102682459B (en) | 2011-03-15 | The interpolation method of key-frame animation curve |
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| CN102682459A true CN102682459A (en) | 2012-09-19 |
| CN102682459B CN102682459B (en) | 2016-12-14 |
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| CN105578184A (en) * | 2016-01-27 | 2016-05-11 | 努比亚技术有限公司 | Key-frame animation generation apparatus and method |
| CN105719330A (en) * | 2014-12-05 | 2016-06-29 | 腾讯科技（北京）有限公司 | Animation curve generation method and device |
| CN108449409A (en) * | 2018-03-16 | 2018-08-24 | 五八有限公司 | Animation method for pushing, device, equipment and storage medium |
| CN108665518A (en) * | 2017-04-01 | 2018-10-16 | Tcl集团股份有限公司 | A kind of control method and system adjusting animation speed |
| CN109275013A (en) * | 2018-09-13 | 2019-01-25 | 广州酷狗计算机科技有限公司 | Method, apparatus, equipment and the storage medium that virtual objects are shown |
| CN111815737A (en) * | 2019-04-26 | 2020-10-23 | 厦门雅基软件有限公司 | Interpolation data processing method, device and equipment and computer readable storage medium |
| CN112634409A (en) * | 2020-12-28 | 2021-04-09 | 稿定（厦门）科技有限公司 | Custom animation curve generation method and device |
| CN113626903A (en) * | 2021-08-18 | 2021-11-09 | 北京赛目科技有限公司 | Road curve setting method and device, electronic equipment and storage medium |
| WO2021254443A1 (en) * | 2020-06-19 | 2021-12-23 | 北京字节跳动网络技术有限公司 | Video variable-speed playing method and apparatus, and electronic device and computer-readable medium |
| CN113992977A (en) * | 2021-10-21 | 2022-01-28 | 郑州阿帕斯数云信息科技有限公司 | Video data processing method and device |
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| CN105719330A (en) * | 2014-12-05 | 2016-06-29 | 腾讯科技（北京）有限公司 | Animation curve generation method and device |
| WO2017128893A1 (en) * | 2016-01-27 | 2017-08-03 | 努比亚技术有限公司 | Keyframe animation creation device and method |
| CN105578184B (en) * | 2016-01-27 | 2018-11-20 | 努比亚技术有限公司 | The generating means and method of key-frame animation |
| CN105578184A (en) * | 2016-01-27 | 2016-05-11 | 努比亚技术有限公司 | Key-frame animation generation apparatus and method |
| CN108665518A (en) * | 2017-04-01 | 2018-10-16 | Tcl集团股份有限公司 | A kind of control method and system adjusting animation speed |
| CN108665518B (en) * | 2017-04-01 | 2021-10-22 | Tcl科技集团股份有限公司 | Control method and system for adjusting animation speed |
| CN108449409B (en) * | 2018-03-16 | 2022-03-25 | 五八有限公司 | Animation pushing method, device, equipment and storage medium |
| CN108449409A (en) * | 2018-03-16 | 2018-08-24 | 五八有限公司 | Animation method for pushing, device, equipment and storage medium |
| CN109275013A (en) * | 2018-09-13 | 2019-01-25 | 广州酷狗计算机科技有限公司 | Method, apparatus, equipment and the storage medium that virtual objects are shown |
| CN111815737A (en) * | 2019-04-26 | 2020-10-23 | 厦门雅基软件有限公司 | Interpolation data processing method, device and equipment and computer readable storage medium |
| CN111815737B (en) * | 2019-04-26 | 2023-03-28 | 厦门雅基软件有限公司 | Interpolation data processing method, device and equipment and computer readable storage medium |
| WO2021254443A1 (en) * | 2020-06-19 | 2021-12-23 | 北京字节跳动网络技术有限公司 | Video variable-speed playing method and apparatus, and electronic device and computer-readable medium |
| CN112634409A (en) * | 2020-12-28 | 2021-04-09 | 稿定（厦门）科技有限公司 | Custom animation curve generation method and device |
| CN112634409B (en) * | 2020-12-28 | 2022-04-19 | 稿定（厦门）科技有限公司 | Custom animation curve generation method and device |
| WO2022142081A1 (en) * | 2020-12-28 | 2022-07-07 | 稿定（厦门）科技有限公司 | Self-defined animation curve generation method and apparatus |
| CN113626903A (en) * | 2021-08-18 | 2021-11-09 | 北京赛目科技有限公司 | Road curve setting method and device, electronic equipment and storage medium |
| CN113626903B (en) * | 2021-08-18 | 2024-03-12 | 北京赛目科技股份有限公司 | Road curve setting method and device, electronic equipment and storage medium |
| CN113992977A (en) * | 2021-10-21 | 2022-01-28 | 郑州阿帕斯数云信息科技有限公司 | Video data processing method and device |
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