CN109741408A - A kind of image and video caricature effect real-time rendering method - Google Patents
A kind of image and video caricature effect real-time rendering method Download PDFInfo
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Abstract
The present invention discloses a kind of image and video caricature effect real-time rendering method, belongs to caricature and technical field of image processing, comprising steps of S1, obtaining original image；S2, detection obtain the edge lines in the original image and with black display in the original image, obtain the first image；S3, the picture color in each pixel value in the first image is converted into brightness value；S4, each pixel value that the brightness value is filled in the first image each channel RGB in, obtain the second image；S5, RGB any one component in each pixel value in second image is obtained, brightness value is classified by preset threshold, changes the display that each brightness degree is presented, picture is made to show black and white caricature effect；It is a kind of quickly, efficiently, the caricature effect process scheme of highly compatible, solve the problems, such as not fast implementing on intelligent terminal at present image or video quickly generated into caricature effect.
Description
Technical field
The present invention relates to caricature and technical field of image processing, real-time more particularly to a kind of image and video caricature effect
Rendering method.
Background technique
Caricature is a kind of graphics art, frequently with gimmicks such as exaggeration, metaphor, symbols, satirizes, criticizes or eulogize certain
A little people and thing, have stronger social, also have the pure works for amusement, have stronger entertainment, recreational works are often
In the presence of the type of making laughs and personage's creation type.Direct or obscure, implicitly understanding and attitude of the expression author to the diverse and confused affairs of human life, be containing
A kind of drawing of romanticism of satire or humour.It is unique contemplated methods and performance with the main distinction of other drawing
Gimmick.It has the artistic characteristic and understanding of satire and humor, education and the social functions such as aesthetic.
Meanwhile popularizing with various digital devices, especially portable digital multimedia equipment, user can set oneself
Post-production is realized by picture software for middle preservation or with the photo that camera, mobile phone are shot, and adds special efficacy.Special efficacy is main
It include: brightness regulation, the basic effects such as saturation degree adjusting.But the special efficacy field of some Special complexes, still compare and lacks.With
People for photographic detail require be growing in the case where, these basic special efficacys have been difficult meet the needs of people.
So many complexity, the special efficacy for simulating real world is developed.For example, the image of caricature effect is imitated with unique vision
Digital Image Processing at caricature effect is also an apparent technical need by fruit.
Traditional caricature is all that caricature is usually painter by PS or drawing board Freehandhand-drawing, although the effect drawn is good, drawing
Speed is too slow, and limitation is big；On the other hand, the epoch popularized as intellectual product, when ordinary people wants some figures liked
Picture or video carry out the rendering of caricature effect when directly generating caricature on intelligent terminal, that is, to video or image, and being can not
It fast implements, this is obviously no longer satisfied the demand in intelligent epoch.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of image and video caricature effect real-time rendering method, provides
It is a kind of quickly, efficiently, the caricature effect process scheme of highly compatible, solve can not be fast implemented on intelligent terminal at present by
Image or video quickly generate the problem of caricature effect.
For this purpose, the technical solution adopted by the present invention is that:
A kind of image caricature effect real-time rendering method is provided, method includes the following steps:
S1, original image is obtained；
S2, detection obtain the edge lines in the original image and with black display in the original image, obtain
First image；
S3, the picture color in each pixel value in the first image is converted into brightness value；
S4, each pixel value that the brightness value is filled in the first image each channel RGB in, obtain second
Image；
S5, RGB any one component in each pixel value in second image is obtained, in the brightness value model of 0-1
In enclosing, brightness value is classified by presetting at least one threshold value, forms multiple brightness degrees, and set to each brightness degree
The black-white colors for determining different proportion make picture show caricature effect.
By the preset threshold within the scope of 0-1, multi-level hierarchical is carried out to brightness value, makes picture in black and white, and pass through black and white
Excessively, prominent different things, and classification is more, effect is better, but the practical level according to image, appropriate can be tested
The suitable classification of selection is just.
Further, the step S2, specifically comprises the following steps:
S21, the original image is passed through into sobel algorithm, gets the edge lines in original image, obtains lines figure
Picture；
S22, the RGB of each pixel value color in the lines image is inverted, and reversion is obtained new
The RGB of color is filled in the lines image, obtains black white image；
S23, when rgb value in the black white image < 0.5, be shown as black, it is on the contrary then show the original image
RGB, the RGB that will acquire are filled to the original image, obtain the first image.
Further, in step S22, the RGB for inverting obtained new color are as follows: newR=1-oldR；newG
=1-oldG；NewB=1-oldB, wherein newR, newG, newB indicate R, G in the RGB of new color that reversion obtains and
B value, oldR, oldG, oldB are respectively R, G and B value of lines image.
Further, in step S3, the formula of the conversion are as follows:
IntenSity=0.2125*R+0.7154*G+0.0721*B,
Wherein, IntenSity indicates brightness value, and R, G and B respectively indicate red, green and blue in single pixel value
Component.
Further, the threshold value includes multiple values between 0.5 and/or 0-0.5 in step S5, brightness value >
When 0.5 brightness degree, color is set as 100% white, and in remaining brightness degree, color is set as black, described black
The ratio of color is greater than 0 and is less than or equal to 100%, and black ratio is sequentially increased between each brightness degree with the reduction of threshold value.
Further, the threshold value is 0.5 and 0.25, when brightness value > 0.5, color is 100% white, and brightness value exists
Between 0.5 and 0.25, color be 50% black, brightness value between 0.25 and 0, color be 100% black.
Stage division and so on, the other classification of more stages may be implemented, such effect can be more preferable.
A kind of video caricature effect real-time rendering method, comprising the following steps: each frame picture of video to be processed is obtained,
And each frame picture is handled using step S2-S5, obtain the video of caricature effect.
The theoretical principle of the method for the present invention is as follows:
Common black and white caricature is analyzed, it can be deduced that, caricature effect has following 3 fundamentals:
1, integral color is in black and white；
2, personage and things have black border；
3, by the excessive of black-white colors, with the different things of protrusion.
For image domains, pixel value RGBA is to represent Red (red) Green (green) Blue (blue) and Alpha
Color space.Although it is described as a color space sometimes, it is only attached for RGB model in fact
Additional information.The color of use is RGB, may belong to any RGB color, but Catmull and Smith exist
This indispensable alpha numerical value is proposed between 1971 to 1972 years, so that alpha rendering and alpha synthesis become possible.
With alpha, to name, to be derived from used in classical linear interpolation equation α A+ (1- α) B be exactly this Greek alphabet to presenter.
To the processing of pixel value RGBA in the method for the present invention, the image as used in process is not involved with transparency
Change (A channel in RGBA), therefore A channel remains 1.
According to the 3 of caricature effects, carried out by the processing method of image according to the given threshold in range of luminance values
Brightness value classification, by the excessive of black-white colors, with the different things of protrusion.
Using the technical program the utility model has the advantages that
1, method of the invention can be faster using existing image or video compared to traditional cartoon-drawing process
Caricature effect is made, and can carry out live preview by opengl platform using camera, increase the dynamic of caricature effect.
2, inventive method of the present invention increases the classification to brightness value, the color of customized display by setting multiple threshold values
And color hierarchy, convenience and high-efficiency, and keep picture color more abundant, meet the different demands to caricature effect.
Detailed description of the invention
Fig. 1 is the flow chart of the method for the present invention；
Fig. 2 is the original image in the first embodiment of the method for the present invention；
Fig. 3 is the caricature effect picture rendered in the first embodiment of the method for the present invention；
Fig. 4 is a raw frames in the second embodiment of the method for the present invention in video；
Fig. 5 is the caricature effect picture that the threshold value rendered in the second embodiment of the method for the present invention is 0.5；
Fig. 6 is the caricature effect picture that the threshold value rendered in the 3rd embodiment of the method for the present invention is 0.5 and 0.25；
Fig. 7 is the caricature effect that the threshold value rendered in the fourth embodiment of the method for the present invention is 0.5,0.32 and 0.16
Figure；
Fig. 8 is that the caricature that the threshold value that renders is 0.5,0.4,0.3 and 0.2 in the 5th embodiment of the method for the present invention is imitated
Fruit figure.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below specific embodiment to the present invention make into
One step illustrates.
Embodiment 1:
In the present embodiment, as shown in Figures 1 to 3, a kind of image caricature effect real-time rendering method, this method includes following
Step:
S1, a RGB original image is obtained；
S21, the original image is passed through into sobel algorithm, gets the edge lines in original image, obtains lines figure
Picture；
S22, the RGB of each pixel value color in the lines image is inverted, and reversion is obtained new
The RGB of color is filled in the lines image, obtains black white image；The RGB for inverting obtained new color are as follows:
NewR=1-oldR；NewG=1-oldG；NewB=1-oldB, wherein it is new to indicate that reversion obtains by newR, newG and newB
R, G and B value in the RGB of color, oldR, oldG and oldB are respectively R, G and B value of lines image.
S23, when rgb value in the black white image < 0.5, be shown as black, it is on the contrary then show the original image
RGB, the RGB that will acquire are filled to the original image, obtain the first image.
S3, the picture color in each pixel value in the first image is converted into brightness value；
The formula of the conversion are as follows:
IntenSity=0.2125*R+0.7154*G+0.0721*B,
Wherein, IntenSity indicates brightness value, and R, G and B respectively indicate red, green and blue in single pixel value
Component.
S4, each pixel value that the brightness value is filled in the first image each channel RGB in, obtain second
Image；
S5, RGB any one component in each pixel value in second image is obtained, in the brightness value model of 0-1
In enclosing, brightness value is classified by presetting at least one threshold value, forms multiple brightness degrees, and set to each brightness degree
The black-white colors for determining different proportion make picture show caricature effect.
The method of the preset threshold are as follows: the threshold value is 0.5, and when brightness value > 0.5, color is 100% black, when
When brightness value≤0.5, color is 100% white.
Embodiment 2
In the present embodiment, as shown in Figures 4 and 5, a kind of image caricature effect real-time rendering method, this method includes following
Step:
S1, RGB original image is obtained, original image is the raw frames in video；
S21, the original image is passed through into sobel algorithm, gets the edge lines in original image, obtains lines figure
Picture；
S22, the RGB of each pixel value color in the lines image is inverted, and reversion is obtained new
The RGB of color is filled in the lines image, obtains black white image；The RGB for inverting obtained new color are as follows:
NewR=1-oldR；NewG=1-oldG；NewB=1-oldB, wherein it is new to indicate that reversion obtains by newR, newG and newB
R, G and B value in the RGB of color, oldR, oldG and oldB are respectively R, G and B value of lines image.
S23, when rgb value in the black white image < 0.5, be shown as black, it is on the contrary then show the original image
RGB, the RGB that will acquire are filled to the original image, obtain the first image.
S3, the picture color in each pixel value in the first image is converted into brightness value；
The formula of the conversion are as follows:
IntenSity=0.2125*R+0.7154*G+0.0721*B,
Wherein, IntenSity indicates brightness value, and R, G and B respectively indicate red, green and blue in single pixel value
Component.
S4, each pixel value that the brightness value is filled in the first image each channel RGB in, obtain second
Image；
S5, RGB any one component in each pixel value in second image is obtained, in the brightness value model of 0-1
In enclosing, brightness value is classified by presetting at least one threshold value, forms multiple brightness degrees, and set to each brightness degree
The black-white colors for determining different proportion make picture show caricature effect.
The method of the preset threshold are as follows: the threshold value is 0.5, and when brightness value > 0.5, color is 100% black, when
When brightness value≤0.5, color is 100% white.
Embodiment 3
In the present embodiment, as shown in figs. 4 and 6, a kind of image caricature effect real-time rendering method, this method includes following
Step:
Difference with embodiment 2 is only that, the method for the preset threshold are as follows: the threshold value is 0.5 and 0.25, brightness value
When > 0.5, color is 100% white, and brightness value is between 0.5 and 0.25, and the black that color is 50%, brightness value is in 0.25 and 0
Between, color be 100% black.
Embodiment 4
In the present embodiment, as illustrated in figures 4 and 7, a kind of image caricature effect real-time rendering method, this method includes following
Step:
Difference with embodiment 2 is only that, the method for the preset threshold are as follows: the threshold value is 0.5,0.32 and 0.16,
When brightness value > 0.5, color is 100% white, and between 0.5 and 0.32, the black that color is 33%, brightness value exists brightness value
Between 0.32 and 0.16, color be 66% black, brightness value between 0.16 and 0, color be 100% black.
Embodiment 5
In the present embodiment, as shown in figures 4 and 8, a kind of image caricature effect real-time rendering method, this method includes following
Step:
Difference with embodiment 2 is only that, the method for the preset threshold are as follows: the threshold value is 0.5,0.4,0.3 and
0.2, when brightness value > 0.5, color is 100% white, and brightness value is between 0.5 and 0.4, the black that color is 25%, brightness value
Between 0.4 and 0.3, the black that color is 50%, brightness value is between 0.3 and 0.2, the black that color is 75%, brightness value
Between 0 and 0.2, color be 100% black.
Embodiment 6
In the present embodiment, as Figures 1 and 4 shown in -8, a kind of video caricature effect real-time rendering method, including following step
It is rapid: to each frame picture of video in embodiment 2-5, each frame picture being handled using step S2-S5, obtains caricature effect
The video of fruit.
It can be seen that in different embodiments, by setting different multiple threshold values, increasing the classification to brightness value, certainly
The color and color hierarchy of display are defined, the caricature effect of display is also different, convenience and high-efficiency, and keeps picture color more rich
Richness meets the different demands to caricature effect.
The basic principles, main features and advantages of the present invention have been shown and described above.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. a kind of image caricature effect real-time rendering method, which comprises the following steps:
S1, original image is obtained；
S2, detection obtain the edge lines in the original image and with black display in the original image, obtain first
Image；
S3, the picture color in each pixel value in the first image is converted into brightness value；
S4, each pixel value that the brightness value is filled in the first image each channel RGB in, obtain the second figure
Picture；
S5, RGB any one component in each pixel value in second image is obtained, in the range of luminance values of 0-1,
Brightness value is classified by presetting at least one threshold value, forms multiple brightness degrees, and not to the setting of each brightness degree
Black-white colors in proportion make picture show caricature effect.
2. rendering method according to claim 1, which is characterized in that the step S2 specifically comprises the following steps:
S21, the original image is passed through into sobel algorithm, gets the edge lines in original image, obtains lines image；
S22, the new color for the RGB of each pixel value color in the lines image being inverted, and reversion being obtained
RGB be filled in the lines image, obtain black white image；
S23, when rgb value in the black white image < 0.5, be shown as black, RGB that is on the contrary then showing the original image will
The RGB got is filled to the original image, obtains the first image.
3. rendering method according to claim 2, which is characterized in that described to invert obtained new color in step S22
RGB are as follows: newR=1-oldR；NewG=1-oldG；NewB=1-oldB, wherein newR, newG and newB expression invert
To new color RGB in R, G and B value, oldR, oldG and oldB are respectively R, G and B value of lines image.
4. rendering method according to claim 1, which is characterized in that in step S3, the formula of the conversion are as follows:
IntenSity=0.2125*R+0.7154*G+0.0721*B,
Wherein, IntenSity indicates that brightness value, R, G and B respectively indicate red in single pixel value, green and blue component.
5. rendering method according to claim 1, which is characterized in that in step S5, the threshold value includes 0.5 and/or 0-
Multiple values between 0.5, in the brightness degree of brightness value > 0.5, color is set as 100% white, in remaining brightness degree
When, color is set as black, and the ratio of the black is greater than 0 and is less than or equal to 100%, and black ratio exists with the reduction of threshold value
It is sequentially increased between each brightness degree.
6. rendering method according to claim 5, which is characterized in that the threshold value include 0.5 and 0.25, work as brightness value >
When 0.5, color is 100% white, and brightness value is between 0.5 and 0.25, and the black that color is 50%, brightness value is in 0.25 and 0
Between, color be 100% black.
7. a kind of video caricature effect real-time rendering method based on any one of the claim 1-6 rendering method, feature
It is, comprising the following steps: obtain each frame picture of video to be processed, and each frame picture is carried out using step S2-S5
Processing, obtains the video of caricature effect.
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| US11893770B2 (en) | 2020-09-29 | 2024-02-06 | Beijing Zitiao Network Technology Co., Ltd. | Method for converting a picture into a video, device, and storage medium |
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Application publication date: 20190510 |