CN104463847A - Ink and wash painting characteristic rendering method - Google Patents
Ink and wash painting characteristic rendering method Download PDFInfo
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- CN104463847A CN104463847A CN201410614969.8A CN201410614969A CN104463847A CN 104463847 A CN104463847 A CN 104463847A CN 201410614969 A CN201410614969 A CN 201410614969A CN 104463847 A CN104463847 A CN 104463847A
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- 238000009877 rendering Methods 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000010422 painting Methods 0.000 title abstract 8
- 238000009792 diffusion process Methods 0.000 claims abstract description 38
- 230000000694 effects Effects 0.000 claims abstract description 28
- 238000000605 extraction Methods 0.000 claims abstract description 7
- 241000209094 Oryza Species 0.000 claims description 49
- 235000007164 Oryza sativa Nutrition 0.000 claims description 49
- 235000009566 rice Nutrition 0.000 claims description 49
- 238000000465 moulding Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 238000009499 grossing Methods 0.000 claims description 8
- 235000013339 cereals Nutrition 0.000 claims description 3
- 238000004891 communication Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 abstract description 2
- 238000003786 synthesis reaction Methods 0.000 abstract description 2
- 238000001914 filtration Methods 0.000 description 4
- 230000002452 interceptive effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000003706 image smoothing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
Classifications
-
- G06T3/04—
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T7/00—Image analysis
- G06T7/10—Segmentation; Edge detection
- G06T7/13—Edge detection
Abstract
The invention provides an ink and wash painting characteristic rendering method. The ink and wash painting characteristic rendering method is characterized by including the following steps: (1) carrying out feature extraction, wherein main line features and luminance features of objects in an original image are extracted and serve as input of ink and wash painting characteristic diffusion; (2) carrying out the ink and wash painting characteristic diffusion, wherein the main line features and the luminance features in the step (1) serve as the input, pixel value information at the main shape portions of the objects are spread to adjacent areas by solving a weighted least square estimate formula, and therefore the ink and wash painting characteristic diffusing effect is generated; (3) generating a Chinese art paper background, wherein the image background with the Chinese art paper grain characteristics is generated in the rendered image; (4) carrying out image synthesis, wherein the Chinese art paper background extracted in the step (3) and the ink and wash painting characteristic diffusing effect in the step (2) are synthesized, and a final ink and wash painting characteristic rendering image is obtained.
Description
Technical field
The invention belongs to image recognition and process field, particularly relate to a kind of ink and wash characteristic rendering intent.
Background technology
Ink and wash is a kind of important oriental traditional artistic expression, and the artistic style of its uniqueness is subject to liking of many people.Ink and wash characteristic Rendering has practical application in many aspects such as planar design, cartoon making and digital entertainments.
At present, the technology major part that ink and wash characteristic is played up is the method based on paintbrush, user to the paintbrush assigned address built and parameters, fictionalizes the ink diffusion effect similar to real world by interactive interface in a computer, thus realizes ink and wash characteristic and play up.But, the method based on paintbrush generally needs hand drawing to specify paintbrush position exactly, for the domestic consumer lacking drawing professional knowledge, differs and realizes well surely.In addition, the interactive mode of hand drawing generally needs the more running time, uses and inconvenience for more complicated image.
To this, the ink and wash characteristic rendering intent based on image directly can generate ink and wash characteristic rendering effect according to true picture, from the angle of ease for use, have more advantage.But owing to simplifying the operation of user, the user profile that can utilize in render process can be less, therefore utilize the method based on image to realize ink and wash characteristic and play up and also have more challenge.Wherein, the generation of the simulation and ink and wash style that realize ink diffusion is two difficult points, and does not also have good solution based on the Rendering of image at present.
Summary of the invention
The object of the invention is to propose a kind of ink and wash characteristic Rendering, true picture can not only be directly utilized to produce the image with ink and wash style, simplify the user operation in render process, improve efficiency and the ease for use of ink and wash Rendering, and by proposing a kind of ink and wash characteristic diffusion technique based on image newly, produce the ink diffusion effect with different level of abstraction, range of scatter and dispersal pattern, improve the operability of ink and wash Rendering and enriched the rendering effect of ink and wash.
Technical scheme of the present invention is as follows:
(1) feature extraction: the principal moulding characteristic sum brightness extracting object in original image, and in this, as the input that ink and wash characteristic spreads;
(2) ink and wash characteristic diffusion: with the principal moulding characteristic sum brightness of step (1) for input, by solving a weighted least-squares formula, the pixel value Information Communication of object principal shape position to its adjacent domain, thus produce the effect of ink and wash characteristic diffusion;
(3) rice paper Background generation: produce the image background with rice paper texture feature in rendering image;
(4) Images uniting: the ink and wash diffusion effect in the rice paper background generated in step (3) and step (2) is synthesized, obtains final ink and wash characteristic rendering image.
In technique scheme, described step (1) feature extraction concrete steps are as follows:
(1-1) original image from RGB color space conversion to CIELAB color space, image is made up of a luminance channel and two Color Channels;
(1-2) use edge preserving smooth filter device to the smoothing process of luminance channel, sharpening result is image brightness properties;
(1-3) with edge detector, edge extracting is carried out to the luminance channel after edge preserving smoothing process, obtain the principal moulding feature of original image.
The concrete steps of described step (2) ink and wash characteristic diffusion are as follows:
(2-1) initial value spread using the principal moulding feature of original image as ink characteristic
;
(2-2) guidance feature spread using the image brightness properties extracted as ink and wash characteristic
, to produce different diffusion effects at different regional areas;
(2-3) image with ink and wash characteristic diffusion effect is produced by solving following weighted least-squares formula
:
Wherein:
represent P for making functional
obtain function during minimum value, z represents spatial domain,
represent the influence degree that pixel exports image, its span is 0 to 1,
the ink and wash characteristic diffusion effect image that representative exports,
the initial value of the ink characteristic diffusion of representative input, symbol
with
representative function P couple respectively
with the partial derivative to y direction, symbol
with
representative function G is to right respectively
with the partial derivative to y direction, parameter
get a little and non-vanishing number, its typical value is 0.0001, be used for avoiding denominator be 0 situation, parameter
for positive number, be used for balancing the ratio of smooth item and data item, parameter
span be generally [1.2,2.0].
The concrete steps of described step (3) rice paper Background generation are as follows:
(3-1) obtain the rice paper texture image with rice paper texture feature, this image from RGB color space conversion to CIELAB color space, obtain rice paper texture image and be made up of a luminance channel and two Color Channels;
(3-2) with the smoothing process of the luminance channel of edge preserving smooth filter device to rice paper texture image, sharpening result is the brightness layer of rice paper texture image;
(3-3) deduct brightness layer by the luminance channel of rice paper texture image, namely obtain the rice paper background image with rice paper grain details.
The concrete steps of described step (4) Images uniting are as follows:
(4-1) with the image with ink and wash characteristic diffusion effect
be added with rice paper background image, obtain the luminance channel of composograph;
(4-2) using the Color Channel at CIELAB color space of two of rice paper texture image Color Channels as composograph;
(4-3) Color Channel of composograph is superposed with luminance channel, obtain composograph and play up output at CIELAB color space;
(4-4) be rgb space the results conversion of CIELAB color space, obtain final ink and wash characteristic rendering image.
Beneficial effect of the present invention and advantage comprise following some:
1. the present invention has wide practical use in professional domain and daily life, as Graphic Advertisement Design, photo post-processed, social networks application and digital entertainment etc.;
2. the present invention is without the need to special interactive device, the rendering effect of the Computer image genration ink and wash characteristic that can directly utilize common camera to obtain, the scope of application that tool is wider;
3. the present invention can automatically utilize true picture to produce ink and wash characteristic effect, without the need to the hand drawing of user, simple to operation;
4. ink and wash characteristic diffusion energy of the present invention produces the ink diffusion effect with different level of abstraction, range of scatter and dispersal pattern, improves the operability of ink and wash Rendering;
5. the present invention produces different ink and wash styles by different ink diffusion effect and the combination of rice paper background, has abundant ink and wash rendering effect.
Accompanying drawing explanation
Fig. 1 is system architecture diagram of the present invention;
Fig. 2 is in ink and wash characteristic diffusion (P), guidance feature
the initial value of ink characteristic diffusion
with ink and wash characteristic diffusion image
design sketch; Wherein a1, a2 are original image, and b1, b2 are guidance feature, and c1, c2 are the initial value of ink characteristic diffusion, and d1, d2 are ink and wash characteristic diffusion image;
Fig. 3 is in rice paper Background generation (B), the design sketch of the luminance channel of rice paper texture image and the rice paper background image of brightness layer and generation; Wherein a is the luminance channel of rice paper texture image, and b is the brightness layer of rice paper texture image, and c is rice paper background image;
Fig. 4 is the design sketch that the rendering with water and ink of Images uniting (C) exports, and a is that the rendering with water and ink of object exports, and b is that the rendering with water and ink of face exports.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described further.
As shown in Figure 1, its concrete steps are as follows for system architecture diagram of the present invention:
(1) feature extraction (F): the principal moulding characteristic sum brightness extracting object in original image, and in this, as the input that ink and wash characteristic spreads;
(2) ink and wash characteristic diffusion (P): with the principal moulding characteristic sum brightness of step (1) for input, by solving a weighted least-squares formula, the pixel value Information Communication of object principal shape position to its adjacent domain, thus produce the effect of ink and wash characteristic diffusion;
(3) rice paper Background generation (B): produce the image background with rice paper texture feature in rendering image;
(4) Images uniting (C): the ink and wash diffusion effect in the rice paper background generated in step (3) and step (2) is synthesized, obtains final ink and wash characteristic rendering image.
The concrete steps of feature extraction of the present invention (F) are as follows:
(F-1) original image from RGB color space conversion to CIELAB color space, image is made up of a luminance channel and two Color Channels;
(F-2) use edge preserving smooth filter device to luminance channel
smoothing process, sharpening result
for image brightness properties, for two-sided filter, have:
，
Wherein, filtering core is
,
for pixel in image
field pixel, parameter (
) be used for controlling corresponding gaussian kernel size in filtering core;
(F-3) with Canny edge detector, edge extracting is carried out to the luminance channel after edge preserving smoothing process, obtain the principal moulding feature of original image.
The concrete steps of ink and wash characteristic diffusion (P) of the present invention are as follows:
(P-1) initial value spread using the principal moulding feature of original image as ink characteristic
; (as referring to fig. 2 c);
(P-2) guidance feature spread using the image brightness properties extracted as ink and wash characteristic
(as shown in accompanying drawing 2b), to produce different diffusion effects at different regional areas;
(P-3) image with ink and wash characteristic diffusion effect is produced by solving following weighted least-squares formula
(as shown in accompanying drawing 2d):
Wherein:
represent P for making functional
obtain function during minimum value, z represents spatial domain,
represent the influence degree that pixel exports image, its span is 0 to 1,
the ink and wash characteristic diffusion effect image that representative exports,
the initial value of the ink characteristic diffusion of representative input, symbol
with
representative function P couple respectively
with the partial derivative to y direction, symbol
with
representative function G is to right respectively
with the partial derivative to y direction, parameter
get a little and non-vanishing number, its typical value is 0.0001, be used for avoiding denominator be 0 situation, parameter
for positive number, be used for balancing the ratio of smooth item and data item, parameter
span be generally [1.2,2.0], as desirable
;
(P-4) for the weighted least-squares problem of step (P-3), according to the mathematical characteristic of model, can being converted into a matrix equation
solve problems, wherein:
And
.Here, subscript
in representative image
with
individual pixel,
represent pixel
4 neighborhoods;
(P-5) for the matrix equation in step (P-4), available conventional numerical computation method solves, and carries out successive ignition to solve as utilized conjugate gradient decent.
The concrete steps of rice paper Background generation (B) of the present invention are as follows:
(B-1) by directly taking real rice paper or obtaining rice paper texture image with algorithm synthesis
, it from RGB color space conversion to CIELAB color space, make rice paper texture image by a luminance channel
(as depicted in figure 3 a) and two Color Channels
with
composition;
(B-2) use edge preserving smooth filter device to the luminance channel of rice paper texture image
smoothing process, sharpening result is rice paper texture image
brightness layer
(as shown in fig. 3b), for two-sided filter, have:
，
Wherein, filtering core is
,
for pixel in image
field pixel, parameter (
) be used for controlling corresponding gaussian kernel size in filtering core;
(B-3) by the luminance channel of rice paper texture image
deduct brightness layer
, namely obtain the rice paper background image with rice paper grain details
, namely
(as shown in accompanying drawing 3c).
The concrete steps of Images uniting of the present invention (C) are as follows:
(C-1) with the image with ink and wash characteristic diffusion effect
with rice paper background image
be added, obtain the luminance channel of composograph
, namely
;
(C-2) two of rice paper texture image Color Channels
with
as the Color Channel at CIELAB color space of composograph, namely
with
;
(C-3) the Color Channel of composograph
with
with with luminance channel
superpose, obtain the output of CIELAB color space;
(C-4) be rgb space the results conversion of CIELAB color space, obtain final ink and wash characteristic rendering image
, as shown in Figure 4.
Claims (5)
1. an ink and wash characteristic rendering intent, is characterized in that comprising following steps:
Feature extraction: the principal moulding characteristic sum brightness extracting object in original image, and in this, as the input that ink and wash characteristic spreads;
Ink and wash characteristic spreads: with the principal moulding characteristic sum brightness of step (1) for input, by solving a weighted least-squares formula, the pixel value Information Communication of object principal shape position to its adjacent domain, thus produce the effect of ink and wash characteristic diffusion;
Rice paper Background generation: produce the image background with rice paper texture feature in rendering image;
Images uniting: the ink and wash diffusion effect in the rice paper background generated in step (3) and step (2) is synthesized, obtains final ink and wash characteristic rendering image.
2. want the ink and wash characteristic rendering intent described in 1 according to right, it is characterized in that described step (1) feature extraction concrete steps are as follows:
(1-1) original image from RGB color space conversion to CIELAB color space, image is made up of a luminance channel and two Color Channels;
(1-2) use edge preserving smooth filter device to the smoothing process of luminance channel, sharpening result is image brightness properties;
(1-3) with edge detector, edge extracting is carried out to the luminance channel after edge preserving smoothing process, obtain the principal moulding feature of original image.
3. want the ink and wash characteristic rendering intent described in 1 according to right, it is characterized in that the concrete steps that described step (2) ink and wash characteristic spreads are as follows:
(2-1) initial value spread using the principal moulding feature of original image as ink characteristic
;
(2-2) guidance feature spread using the image brightness properties extracted as ink and wash characteristic
;
(2-3) image with ink and wash characteristic diffusion effect is produced by solving following weighted least-squares formula
:
Wherein: symbol
represent P for making functional
obtain function during minimum value, z represents spatial domain,
represent the influence degree that pixel exports image, its span is 0 to 1,
the ink and wash characteristic diffusion effect image that representative exports,
the initial value of the ink characteristic diffusion of representative input, symbol
with
representative function P couple respectively
with the partial derivative to y direction, symbol
with
representative function G couple respectively
with the partial derivative to y direction, parameter
get a little and non-vanishing number, its typical value is 0.0001, be used for avoiding denominator be 0 situation, parameter
for positive number, be used for balancing the ratio of smooth item and data item, parameter
span be generally [1.2,2.0].
4. want the ink and wash characteristic rendering intent described in 1 according to right, it is characterized in that the concrete steps of described step (3) rice paper Background generation are as follows:
(3-1) obtain the rice paper texture image with rice paper texture feature, this image from RGB color space conversion to CIELAB color space, obtain rice paper texture image and be made up of a luminance channel and two Color Channels;
(3-2) with the smoothing process of the luminance channel of edge preserving smooth filter device to rice paper texture image, sharpening result is the brightness layer of rice paper texture image;
(3-3) deduct brightness layer by the luminance channel of rice paper texture image, namely obtain the rice paper background image with rice paper grain details.
5. want the ink and wash characteristic rendering intent described in 1 according to right, it is characterized in that the concrete steps of described step (4) Images uniting are as follows:
(4-1) with the image with ink and wash characteristic diffusion effect
be added with rice paper background image, obtain the luminance channel of composograph;
(4-2) using the Color Channel at CIELAB color space of two of rice paper texture image Color Channels as composograph;
(4-3) Color Channel of composograph is superposed with luminance channel, obtain composograph and play up output at CIELAB color space;
(4-4) be rgb space the results conversion of CIELAB color space, obtain final ink and wash characteristic rendering image.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820999A (en) * | 2015-04-28 | 2015-08-05 | 成都品果科技有限公司 | Method for converting natural image into ink and wash painting |
| CN107220962A (en) * | 2017-04-07 | 2017-09-29 | 北京工业大学 | A kind of image detecting method and device of tunnel crackle |
| CN109741408A (en) * | 2018-11-23 | 2019-05-10 | 成都品果科技有限公司 | A kind of image and video caricature effect real-time rendering method |
| CN113177997A (en) * | 2021-04-25 | 2021-07-27 | 上海雷鸣文化传播有限公司 | Method for realizing ink and wash effect rendering based on neural network graphic algorithm |
| CN117409127A (en) * | 2023-12-15 | 2024-01-16 | 中国美术学院 | Real-time ink fluid rendering method and device based on artificial intelligence |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104820999A (en) * | 2015-04-28 | 2015-08-05 | 成都品果科技有限公司 | Method for converting natural image into ink and wash painting |
| CN104820999B (en) * | 2015-04-28 | 2017-06-16 | 成都品果科技有限公司 | A kind of method that natural image is converted into ink and wash style image |
| CN107220962A (en) * | 2017-04-07 | 2017-09-29 | 北京工业大学 | A kind of image detecting method and device of tunnel crackle |
| CN107220962B (en) * | 2017-04-07 | 2020-04-21 | 北京工业大学 | Image detection method and device for tunnel cracks |
| CN109741408A (en) * | 2018-11-23 | 2019-05-10 | 成都品果科技有限公司 | A kind of image and video caricature effect real-time rendering method |
| CN113177997A (en) * | 2021-04-25 | 2021-07-27 | 上海雷鸣文化传播有限公司 | Method for realizing ink and wash effect rendering based on neural network graphic algorithm |
| CN117409127A (en) * | 2023-12-15 | 2024-01-16 | 中国美术学院 | Real-time ink fluid rendering method and device based on artificial intelligence |
| CN117409127B (en) * | 2023-12-15 | 2024-04-05 | 中国美术学院 | Real-time ink fluid rendering method and device based on artificial intelligence |
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