CN101031030A - Method and system for adding special effects into image - Google Patents
Method and system for adding special effects into image Download PDFInfo
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- CN101031030A CN101031030A CN 200710098411 CN200710098411A CN101031030A CN 101031030 A CN101031030 A CN 101031030A CN 200710098411 CN200710098411 CN 200710098411 CN 200710098411 A CN200710098411 A CN 200710098411A CN 101031030 A CN101031030 A CN 101031030A
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Abstract
The method comprises: a) if variance ratio between the coordinator of the area in current frame to be processed and the coordinator of the area in reference frame to be processed doesn't reach a threshold, then entering step b; b) determining the reference area in the area of current frame to be processed and the area of reference area to be processed; the difference of pixel values in said two reference areas reaches the preset threshold, the according to the coordinator of the area of current frame, adding the specific effects.
Description
Technical field
The present invention relates to image processing techniques, relate in particular to the method and system that image is added special efficacy.
Background technology
At present, image detection and tracking technique, especially people's face detect with tracking technique more and more ripe, use also more and more widely.In video production, can for example, can add special efficacys such as mosaic to detecting and following the tracks of resulting human face region interpolation special efficacy.
In the method for existing interpolation special efficacy, a kind of method is directly to utilize the coordinate of following the tracks of the image-region that obtains to add special efficacy.But, in or the human face region that obtains relatively poor when picture quality activities (as the action in the zone of eye, mouth) is arranged the time, can among a small circle, shake according to detecting with the resulting human face region of tracking, thereby cause human face region reality not take place under the situation of mass motion, the special efficacy of adding at human face region produces the problem of shake.Another kind method is at the setting coordinate threshold value, if with reference to picture element in the changes in coordinates of present frame and previous frame in the scope of setting, think that then mass motion does not take place human face region, be used to realize that the coordinate of special efficacy does not change.But if preset threshold is less, then when the shake of regional area, system thinks to have mass motion possibly and the special efficacy that causes adding at human face region produces shake; If preset threshold is excessive, can make again that in that human face region is actual when moving the phenomenon that lags behind appears in the special efficacy of interpolation.
Summary of the invention
The invention provides and a kind of image is added the method and system of special efficacy, solving not moving when pending regional integration of existing in the prior art, and under the situation of local motion, the jitter problem of the special efficacy that image is added.
The invention provides a kind of method to image interpolation special efficacy, this method comprises:
A, if the rate of change between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame does not reach threshold value, then carry out B;
B, determine the reference zone in pending zone of described present frame and the pending zone of reference frame, if the difference of the pixel value of the picture element that comprises respectively in two described reference zones reaches set point, then the coordinate according to the pending zone of described present frame adds special efficacy.
If the difference of the pixel value of the picture element that comprises respectively in two reference zones described in the step B does not reach set point, then the coordinate according to the pending zone of described reference frame adds special efficacy.
If the rate of change described in the steps A between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame reaches threshold value, then the coordinate according to the pending zone of described present frame adds special efficacy.
Described reference frame is the previous frame of described present frame, and then steps A comprises:
The coordinate in A1, the coordinate of determining the pending zone of described present frame and the pending zone of described previous frame;
A2, if the rate of change between the coordinate in the coordinate in the pending zone of described present frame and the pending zone of described previous frame does not reach threshold value, then carry out B.
Described pending zone is a human face region, and the picture element number that comprises respectively in two reference zones is identical.
Reference zone in described definite pending zone of described present frame and the pending zone of reference frame comprises:
Determine the reference zone in the pending zone of described present frame;
With the coordinate of the reference zone in the pending zone of described present frame determined coordinate as the reference zone in the pending zone of described reference frame.
The reference zone in described definite pending zone of described present frame comprises:
Determine the center point coordinate in the pending zone of described present frame;
With the zone set as described reference zone, the center point coordinate in the zone of this setting overlaps with the center point coordinate in described pending zone, and the ratio of the picture element number that comprises of the picture element number that comprises of the zone of this setting and described pending zone is not more than save value.
If described save value is 0.25, reference zone is the rectangular area, then the length of this reference zone and wide 1/3 of the pending zone that is respectively.
The pixel value of described picture element is brightness value or chromatic value.
The present invention also provides a kind of image is added the system of special efficacy, and this system comprises first judging unit, trigger element, second judging unit and adding device, wherein,
Described first judging unit is used to judge whether the rate of change between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame arrives threshold value, and first judged result is sent to described trigger element;
Described trigger element is used to receive described first judged result, does not reach threshold value if this first judged result is a rate of change between the coordinate, then triggers second judging unit;
Described second judging unit, be used for determining the reference zone in pending zone of described present frame and the pending zone of reference frame, whether the difference of judging the pixel value of the picture element that comprises respectively in two described reference zones reaches set point, and second judged result is sent to described adding device;
Described adding device is used to receive described second judged result, if the difference that this second judged result is a pixel value reaches set point, then the coordinate according to the pending zone of described present frame adds special efficacy.
Described adding device also is used for if the difference that described second judged result is a pixel value does not reach set point, and then the coordinate according to the pending zone of described reference frame adds special efficacy.
Described system also comprises operating unit, reaches threshold value if described first judged result is a rate of change between the coordinate, and then described trigger element is used to trigger described operating unit;
Described operating unit is used for adding special efficacy according to the coordinate in the pending zone of described present frame.
Described first judging unit comprises:
Determining unit is used for determining the coordinate in the pending zone of described present frame and the coordinate in the pending zone of described reference frame;
Control unit is used to judge whether the rate of change between the coordinate in the coordinate in the pending zone of described present frame and the pending zone of described reference frame reaches threshold value, and described first judged result is sent to described trigger element.
Described pending zone is a human face region, and the picture element number that comprises respectively in two reference zones is identical, and then described second judging unit comprises:
Selected cell is used for determining the reference zone in the pending zone of described present frame;
Map unit, the coordinate of reference zone that is used for the pending zone of described present frame that will determine is as the coordinate of the reference zone in the pending zone of described reference frame.
Performance element is used to judge whether the difference of pixel value of the picture element of two described reference zones reaches set point, and described second judged result is sent to described adding device.
Described selected cell comprises:
The central point determining unit is used for determining the center point coordinate in the pending zone of described present frame;
The reference zone determining unit, the zone that is used for setting is as described reference zone, the center point coordinate in the zone of this setting overlaps with the center point coordinate in described pending zone, and the ratio of the picture element number that comprises of the picture element number that comprises of the zone of this setting and described pending zone is not more than save value.
The present invention by judging the pending zone of present frame coordinate and the rate of change between the coordinate in the pending zone of reference frame do not reach threshold value, and when the difference between the pixel value of the reference zone in the pending zone of present frame and the pixel value of the reference zone in the reference frame reaches set point, add the method for special efficacy according to the coordinate in the pending zone of present frame, avoided not moving when pending regional integration, and under the situation of local motion, the phenomenon that lags behind appears in the jitter problem of the special efficacy that image is added, the special efficacy of having added when also having avoided pending regional integration to move simultaneously.
Description of drawings
Fig. 1 is a system configuration schematic diagram in the embodiment of the invention;
Fig. 2 is a method step schematic flow sheet in the embodiment of the invention;
Fig. 3 is the reference zone in the human face region of determining in the embodiment of the invention.
Embodiment
The inventive method mainly comprises: if the rate of change between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame does not reach threshold value, then determine the reference zone in pending zone of described present frame and the pending zone of reference frame, if the difference of the pixel value of the picture element that comprises respectively in two described reference zones reaches set point, then the coordinate according to the pending zone of described present frame adds special efficacy.
Describe the inventive method in detail below in conjunction with specific embodiment.
As shown in Figure 1, be system configuration schematic diagram in the embodiment of the invention, this system comprises first judging unit 11, trigger element 12, second judging unit 13 and adding device 14, wherein, first judging unit 11 is used to judge whether the rate of change between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame arrives threshold value, and first judged result is sent to described trigger element 12; Trigger element 12 is used to receive described first judged result, does not reach threshold value if this first judged result is a rate of change between the coordinate, then triggers second judging unit 13; Second judging unit 13 is used for determining the reference zone in pending zone of described present frame and the pending zone of reference frame, whether the difference of judging the pixel value of the picture element that comprises respectively in two described reference zones reaches set point, and second judged result is sent to described adding device 14; Adding device 14 is used to receive described second judged result, if the difference that this second judged result is a pixel value reaches set point, then the coordinate according to the pending zone of described present frame adds special efficacy.
Pending zone of present frame and the pending zone of reference frame all are to be positioned at coordinate that the same coordinate system is determined them, in embodiments of the present invention, this coordinate system can be regarded as the frame of reference, all coordinates of describing in follow-up system all will be based on this frame of reference, in order to repeat no more for simplicity.
Described adding device 14 also is used for not reaching set point if described second judged result is a change amount between the pixel value, and then the coordinate according to the pending zone of described reference frame adds special efficacy.
Described system also comprises operating unit 15, reaches threshold value if described first judged result is a rate of change between the coordinate, and then described trigger element 12 is used to trigger described operating unit 15; Operating unit 15 is used for adding special efficacy according to the coordinate in the pending zone of described present frame.
Described pending zone is a human face region, and the picture element number that comprises respectively in two reference zones is identical, then described second judging unit 13 comprises selected cell 21, map unit 22 and performance element 23, wherein, selected cell 21 is used for determining the reference zone in the pending zone of described present frame; Map unit 22 is used for the coordinate of reference zone in the pending zone of described present frame that will determine as the coordinate of the reference zone in the pending zone of described reference frame; Performance element 23 is used to judge whether the difference of the pixel value of two described reference zones reaches set point, and second judged result is sent to described adding device 14.
Further, described selected cell 21 comprises central point determining unit 31 and reference zone determining unit 32, and wherein, central point determining unit 31 is used for determining the center point coordinate in the pending zone of described present frame; The zone that reference zone determining unit 32 is used for setting is as described reference zone, the center point coordinate in the zone of this setting overlaps with the center point coordinate in described pending zone, and the ratio of the picture element number that comprises of the picture element number that comprises of the zone of this setting and described pending zone is not more than save value.
Described first judging unit 11 comprises determining unit 24 and control unit 25, and wherein, determining unit 24 is used for determining the coordinate in the pending zone of present frame and the coordinate in the pending zone of reference frame; Control unit 25 is used to judge whether the rate of change between the coordinate in the coordinate in the pending zone of described present frame and the pending zone of described reference frame reaches threshold value, and described first judged result is sent to described trigger element 12.
As shown in Figure 2, be method step schematic flow sheet in the embodiment of the invention, this method comprises:
Step 201: determine the coordinate in the pending zone of present frame and the coordinate in the pending zone of reference frame.
In embodiments of the present invention, setting pending zone is human face region, and reference frame is the previous frame of present frame, in the present embodiment, can certainly select other frames as the reference frame, as with preceding the 3rd frame as the reference frame, or with a certain anchor-frame as the reference frame, still, consider the accumulation that error may occur, therefore, select for use previous frame will be better than the 3rd frame as the reference frame as the reference frame, or with a certain anchor-frame as the reference frame.
At first in image, determine reference coordinate, determine then this human face region in reference coordinate coordinate and reference frame in the coordinate of human face region in reference coordinate, in embodiments of the present invention, the follow-up coordinate that relates to all is meant the coordinate in reference coordinate.Then, behind the coordinate of determining human face region, if present frame is first frame, then can be directly according to the coordinate interpolation special efficacy of the human face region of present frame; If present frame is not first frame, then will judge whether the difference of present frame human face region coordinate and previous frame coordinate reaches threshold value, and then determine that still it still is that coordinate according to the present frame human face region adds special efficacy that coordinate according to the previous frame human face region adds special efficacy by follow-up operation.
Step 202: judge whether the coordinate in the pending zone of present frame and the rate of change between the pending area coordinate of previous frame reach threshold value, if, then add special efficacy according to the pending area coordinate of present frame, otherwise, execution in step 203.
In step 201, determined the coordinate (Xlefttop of present frame human face region in reference coordinate, Ylefttop, Xrightbottom, Yrightbottom), then with coordinate in reference coordinate of the human face region of this coordinate and previous frame (Xlefttop ', Ylefttop ', Xrightbottom ', Yrightbottom ') compares, whether the coordinate change amount of judging the pending zone of these adjacent two frames reaches threshold value, promptly judge Xlefttop and Xlefttop ', Ylefttop and Ylefttop ', Xrightbottom and Xrightbottom ', whether the difference of Yrightbottom and Yrightbottom ' reaches threshold value, certainly, also can be as long as judge whether one of them or more than one difference reach threshold value, if reach, the pending zone that can determine present frame is compared with the pending zone of previous frame mass motion has been taken place, and then adds special efficacy according to the pending area coordinate of described present frame; Otherwise, illustrate that the pending zone of present frame with respect to the pending zone of previous frame mass motion does not take place, then execution in step 203.
Step 203: determine the reference zone in pending zone of present frame and the pending zone of reference frame, whether the difference of judging the pixel value of the picture element that comprises respectively in these two reference zones reaches set point, if then add special efficacy according to the pending area coordinate of present frame; Otherwise, then add special efficacy according to the pending area coordinate of previous frame.
Determine that in embodiments of the present invention present frame treats that the reference zone method in human face region and the previous frame human face region can be the reference zone of at first determining the present frame human face region, coordinate with the reference zone in the present frame human face region of determining is mapped in the previous frame human face region then, is about to the coordinate of the reference zone coordinate of definite present frame human face region as the reference zone in the previous frame human face region.
The principle of determining the reference zone in the present frame human face region is generally: have the smaller zone of pixel value rate of change of enriching details and picture element, can know according to priori, can be nasal region in human face region, this zone can artificially be determined.Definite mode of She Dinging can be the center point coordinate of at first determining the present frame human face region in the present embodiment, the zone that to set is as the reference zone of this human face region then, the center point coordinate in the zone of this setting overlaps with the center point coordinate of human face region, and the ratio of the picture element number that comprises of the picture element number that comprises of the zone of this setting and human face region is not more than save value.
As shown in Figure 3, be the reference zone in the present frame human face region of determining in the embodiment of the invention, in the present embodiment, setting described save value is 0.25.Among Fig. 3, setting the upper left angle point of human face region is the origin of coordinates, and reference axis x is being axially down for just, y axially the right side for just.As can be seen from the figure, if this reference zone is rectangle, then determine four summits of this rectangle coordinate (X1, Y1), (X2, Y2), (X3, Y3) and (X4 Y4) can realize by following formula (1).
Wherein, Wd represents the human face region width, and He represents human face region length, i.e. the length of reference zone and wide 1/3 of the human face region that is respectively.Behind four apex coordinates having determined reference zone, can easily obtain the reference zone in this human face region.Certainly, in the present invention, the mode of other definite reference zone can be arranged also, for example, utilize aforesaid way to determine reference zone in the pending zone of present frame and the reference zone in the pending zone of previous frame respectively.
When having determined in the present frame can easily to obtain the pixel value sum of all picture elements in this reference zone behind the reference zone in the human face region, in the present embodiment, this pixel value can be brightness value or chromatic value.Then, whether the difference of judging the pixel value of reference zone in the pixel value of present frame reference zone and the previous frame reaches set point.In the present embodiment, the difference of determining the pixel value of reference zone in present frame reference zone and the previous frame can realize according to formula (2).
r＝(sum(Frame(i，Zone))-sum(Frame(i-1，Zone)))/sum(Frame(i，Zone)) (2)
Wherein, r represents that pixel value gets difference; I represents the present frame frame; I-1 represents previous frame; Zone represents the reference zone coordinate figure; Sum (the pixel value sum of reference zone in Frame (i, Zone)) the expression present frame; Sum (the pixel value sum of Frame (i-1, Zone)) expression reference zone in previous frame.If r value when reaching set point, is then thought human face region generation mass motion, the coordinate of output present frame human face region, and utilize the coordinate interpolation special efficacy of this present frame human face region; Otherwise, illustrate that mass motion does not take place human face region, then add special efficacy according to previous frame human face region coordinate.
The method and system that provides by the embodiment of the invention, avoided not moving when pending regional integration, and under the situation of local motion, the jitter problem of the special efficacy that image is added, the phenomenon that lags behind appears in the special efficacy of having added when also having avoided pending regional integration to move simultaneously.
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, if of the present invention these are revised and modification belongs within the scope of claim of the present invention and equivalent technologies thereof, then the present invention also is intended to comprise these changes and modification interior.
Claims (15)
1, a kind of method to image interpolation special efficacy is characterized in that this method comprises:
A, if the rate of change between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame does not reach threshold value, then carry out B;
B, determine the reference zone in pending zone of described present frame and the pending zone of reference frame, if the difference of the pixel value of the picture element that comprises respectively in two described reference zones reaches set point, then the coordinate according to the pending zone of described present frame adds special efficacy.
2, the method for claim 1 is characterized in that, if the difference of the pixel value of the picture element that comprises respectively in two reference zones described in the step B does not reach set point, then the coordinate according to the pending zone of described reference frame adds special efficacy.
3, the method for claim 1 is characterized in that, if the rate of change between the coordinate in coordinate in the pending zone of present frame described in the steps A and the pending zone of reference frame reaches threshold value, then the coordinate according to the pending zone of described present frame adds special efficacy.
4, the method for claim 1 is characterized in that, described reference frame is the previous frame of described present frame, and then steps A comprises:
The coordinate in A1, the coordinate of determining the pending zone of described present frame and the pending zone of described previous frame;
A2, if the rate of change between the coordinate in the coordinate in the pending zone of described present frame and the pending zone of described previous frame does not reach threshold value, then carry out B.
5, method as claimed in claim 4 is characterized in that, described pending zone is a human face region, and the picture element number that comprises respectively in two reference zones is identical.
6, method as claimed in claim 5 is characterized in that, the reference zone in described definite pending zone of described present frame and the pending zone of reference frame comprises:
Determine the reference zone in the pending zone of described present frame;
With the coordinate of the reference zone in the pending zone of described present frame determined coordinate as the reference zone in the pending zone of described reference frame.
7, method as claimed in claim 6 is characterized in that, the reference zone in described definite pending zone of described present frame comprises:
Determine the center point coordinate in the pending zone of described present frame;
With the zone set as described reference zone, the center point coordinate in the zone of this setting overlaps with the center point coordinate in described pending zone, and the ratio of the picture element number that comprises of the picture element number that comprises of the zone of this setting and described pending zone is not more than save value.
8, method as claimed in claim 7 is characterized in that, if described save value is 0.25, reference zone is the rectangular area, then the length of this reference zone and wide 1/3 of the pending zone that is respectively.
9, the method for claim 1 is characterized in that, the pixel value of described picture element is brightness value or chromatic value.
10, a kind of system to image interpolation special efficacy is characterized in that this system comprises first judging unit, trigger element, second judging unit and adding device, wherein,
Described first judging unit is used to judge whether the rate of change between the coordinate in the coordinate in the pending zone of present frame and the pending zone of reference frame arrives threshold value, and first judged result is sent to described trigger element;
Described trigger element is used to receive described first judged result, does not reach threshold value if this first judged result is a rate of change between the coordinate, then triggers described second judging unit;
Described second judging unit, be used for determining the reference zone in pending zone of described present frame and the pending zone of reference frame, whether the difference of judging the pixel value of the picture element that comprises respectively in two described reference zones reaches set point, and second judged result is sent to described adding device;
Described adding device is used to receive described second judged result, if the difference that this second judged result is a pixel value reaches set point, then the coordinate according to the pending zone of described present frame adds special efficacy.
As system as described in the claim 10, it is characterized in that 11, described adding device also is used for if the difference that described second judged result is a pixel value does not reach set point, then the coordinate according to the pending zone of described reference frame adds special efficacy.
12, as system as described in the claim 10, it is characterized in that described system also comprises operating unit, reach threshold value if described first judged result is a rate of change between the coordinate, then described trigger element is used to trigger described operating unit;
Described operating unit is used for adding special efficacy according to the coordinate in the pending zone of described present frame.
13, as system as described in the claim 10, it is characterized in that described first judging unit comprises:
Determining unit is used for determining the coordinate in the pending zone of described present frame and the coordinate in the pending zone of described reference frame;
Control unit is used to judge whether the rate of change between the coordinate in the coordinate in the pending zone of described present frame and the pending zone of described reference frame reaches threshold value, and described first judged result is sent to described trigger element.
14, as system as described in the claim 10, it is characterized in that described pending zone is a human face region, and the picture element number that comprises respectively in two reference zones is identical, then described second judging unit comprises:
Selected cell is used for determining the reference zone in the pending zone of described present frame;
Map unit, the coordinate of reference zone that is used for the pending zone of described present frame that will determine is as the coordinate of the reference zone in the pending zone of described reference frame;
Performance element is used to judge whether the difference of pixel value of the picture element of two described reference zones reaches set point, and described second judged result is sent to described adding device.
15, as system as described in the claim 14, it is characterized in that described selected cell comprises:
The central point determining unit is used for determining the center point coordinate in the pending zone of described present frame;
The reference zone determining unit, the zone that is used for setting is as described reference zone, the center point coordinate in the zone of this setting overlaps with the center point coordinate in described pending zone, and the ratio of the picture element number that comprises of the picture element number that comprises of the zone of this setting and described pending zone is not more than save value.
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| CNB2007100984119A CN100464569C (en) | 2007-04-17 | 2007-04-17 | Method and system for adding special effects into image |
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| CN109474850A (en) * | 2018-11-29 | 2019-03-15 | 北京字节跳动网络技术有限公司 | Move pixel special video effect adding method, device, terminal device and storage medium |
| CN109348277A (en) * | 2018-11-29 | 2019-02-15 | 北京字节跳动网络技术有限公司 | Move pixel special video effect adding method, device, terminal device and storage medium |
| CN109474850B (en) * | 2018-11-29 | 2021-07-20 | 北京字节跳动网络技术有限公司 | Motion pixel video special effect adding method and device, terminal equipment and storage medium |
| CN114222191A (en) * | 2021-11-24 | 2022-03-22 | 星际互娱(北京)科技股份有限公司 | System for chat reloading video playing |
| CN114222191B (en) * | 2021-11-24 | 2023-09-08 | 星际数科科技股份有限公司 | Chat reloading video playing system |
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