CN109325986B - Sketch drawing method and device - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
- G06T11/20—Drawing from basic elements, e.g. lines or circles
- G06T11/203—Drawing of straight lines or curves
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Abstract
The invention discloses a sketch drawing method and device, wherein the method comprises the steps of obtaining a selected image, and carrying out gray processing on the selected image to obtain a processed image; according to the gray values of the pixel points of the processed image, a gray distribution curve graph of all the pixel points of the processed image is established; dividing all pixel points of the processed image into a plurality of groups by taking each minimum value point in the graph as a dividing point; and carrying out normalization processing on the gray values of the pixel points in the same group to obtain average gray values of the groups, determining the corresponding line drawing sub-paths of the groups according to the positions of the pixel points in the groups in the processed image, and determining the drawing times of the line drawing sub-paths according to the average gray values of the groups. According to the drawing sub-paths of each group and the drawing times of each drawing sub-path, calculating the drawing total path, drawing the sketch of the selected image according to the drawing total path, and automatically carrying out sketch drawing according to the selected image to obtain the sketch of the selected image by implementing the embodiment of the invention.
Description
Technical Field
The invention relates to the field of computers, in particular to a sketch drawing method and device.
Background
The charcoal, pencil, pen, etc. are used to draw single-colour picture of light and shade, called sketch, which is a formal artistic creation, and single-colour line is used to represent things in visual world, and also can express thought, concept, attitude, emotion, illusion, symbolism and even abstract form. It does not emphasize the overall and color as colored drawings, but rather the structure and form.
However, in the existing sketch, people with a certain drawing foundation are required to author, the quality of the sketch work depends on the drawing level of the author to a great extent, and people without the drawing foundation cannot author the sketch work.
Disclosure of Invention
The embodiment of the invention provides an automatic sketch method and an automatic sketch device, which can automatically perform sketch drawing according to a selected picture to obtain a sketch map of the selected picture.
The first embodiment of the invention provides a sketch drawing method, which comprises the following steps:
acquiring a selected image, and carrying out gray processing on the selected image to obtain a processed image;
establishing a gray level distribution curve graph of all pixel points of the processed image according to the gray level value of each pixel point of the processed image;
dividing all pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray distribution curve graph as a dividing point;
carrying out normalization processing on the gray values of all pixel points positioned in the same group to obtain average gray values of all groups;
and determining the drawing times of each drawing sub-path according to the average gray value of each group.
And calculating a total line drawing path according to the line drawing sub-paths of each group and the drawing times of each line drawing sub-path, and drawing a sketch of the selected image according to the total line drawing path.
Further, the gray scale distribution graph takes a gray scale value as an X axis and the number of pixel points as a Y axis.
Further, the normalizing process is performed on the gray values of the pixels in the same group to obtain average gray values of the groups, specifically:
and calculating the gray average value of the pixels in the same group, and taking the gray average value of the pixels in the same group as the gray values of all the pixels in the same group.
Further, determining a line drawing sub-path corresponding to each group according to the position of the pixel point in each group in the processed image, specifically:
connecting adjacent pixel points positioned in the same group to form a first connecting line segment of the same group;
taking each pixel point which is positioned in the same group and has no adjacent point as a second connecting line segment of the same group;
and taking the first connecting line segment and the second connecting line segment as the drawing sub-paths of the same group.
Further, the calculating the total path of the drawing line according to the drawing sub paths of each group and the drawing times of each drawing sub path specifically includes: and arranging and combining the drawing sub-paths of each group and the drawing times of each drawing sub-path, and taking the path with the shortest drawing time as the drawing total path.
A second embodiment is correspondingly provided on the basis of the first embodiment of the invention.
The second embodiment of the invention provides a sketch drawing device which comprises an image acquisition module, a graph drawing module, a pixel point grouping module, a gray value normalization module, a sub-path calculation module and a drawing module;
the image acquisition module is used for acquiring a selected image and carrying out gray processing on the selected image to obtain a processed image;
the curve drawing module is used for establishing a gray level distribution curve graph of all pixel points of the processed image according to the gray level value of each pixel point of the processed image;
the pixel point grouping module is used for dividing all the pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray level distribution curve graph as a dividing point;
the gray value normalization module is used for carrying out normalization processing on the gray values of the pixel points in the same group to obtain average gray values of the groups;
the sub-path calculation module is used for determining the drawing sub-paths corresponding to each group according to the positions of the pixel points in each group in the processed image, and determining the drawing times of each drawing sub-path according to the average gray value of each group.
The drawing module is used for calculating a total drawing path according to the drawing sub-paths of each group and the drawing times of each drawing sub-path, and then drawing the sketch of the selected image according to the total drawing path.
Further, the gray scale distribution graph takes a gray scale value as an X axis and the number of pixel points as a Y axis.
Further, the normalizing process is performed on the gray values of the pixels in the same group to obtain average gray values of the groups, specifically:
and calculating the gray average value of the pixels in the same group, and taking the gray average value of the pixels in the same group as the gray values of all the pixels in the same group.
Further, determining a line drawing sub-path corresponding to each group according to the position of the pixel point in each group in the processed image, specifically:
connecting adjacent pixel points positioned in the same group to form a first connecting line segment of the same group;
taking each pixel point which is positioned in the same group and has no adjacent point as a second connecting line segment of the same group;
and taking the first connecting line segment and the second connecting line segment as the drawing sub-paths of the same group.
Further, the calculating the total path of the drawing line according to the drawing sub paths of each group and the drawing times of each drawing sub path specifically includes: and arranging and combining the drawing sub-paths of each group and the drawing times of each drawing sub-path, and taking the path with the shortest drawing time as the drawing total path.
By implementing the embodiment of the invention, the following beneficial effects are achieved:
the embodiment of the invention provides a sketch drawing method, which is used for carrying out gray level processing on a selected picture and extracting gray level values of all pixel points in an image. Establishing a distribution curve graph according to gray values of all pixel points, and dividing all pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray distribution curve graph as a dividing point; carrying out normalization processing on the gray values of all pixel points positioned in the same group to obtain average gray values of all groups; and determining the drawing times of each drawing sub-path according to the average gray value of each group. Calculating a line drawing total path according to the line drawing sub-paths of each group and the drawing times of each line drawing sub-path, and drawing a sketch map of the selected image according to the line drawing total path, so that sketch drawing is automatically carried out, and sketch drawing of the selected image is obtained.
Drawings
FIG. 1 is a flow chart of an automatic sketch method provided by a first embodiment of the present invention;
FIG. 2 is a schematic view of an automatic sketch device according to a second embodiment of the present invention;
reference numerals illustrate: 101. an image acquisition module; 102. a graph drawing module; 103. a pixel point grouping module; 104. a gray value normalization module; 105. a sub-path calculation module; 106. and a drawing module.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1, a sketch drawing method provided in a first embodiment of the present invention includes the steps of:
s101, acquiring a selected image, and carrying out gray processing on the selected image to obtain a processed image;
s102, establishing a gray level distribution curve graph of all pixel points of the processed image according to gray level values of all pixel points of the processed image;
s103, dividing all pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray distribution curve graph as a dividing point;
s104, carrying out normalization processing on the gray values of the pixel points in the same group to obtain average gray values of the groups;
s105, determining the corresponding line drawing sub-paths of each group according to the positions of the pixel points in each group in the processed image, and determining the drawing times of each line drawing sub-path according to the average gray value of each group.
S106, calculating the total path of the drawing lines according to the sub paths of the drawing lines of each group and the drawing times of the sub paths of the drawing lines, and drawing the sketch of the selected image according to the total path of the drawing lines.
For step S101, it is to be added that the selected image may be, but is not limited to, a picture taken on site or a picture on a network medium.
For step S102, specifically: and establishing a gray distribution curve graph of all pixels of the processed image by taking the gray value of each pixel of the processed image as an X axis and the number of the pixels corresponding to the gray value as a Y axis.
For step S103, specifically: and taking the point of each minimum value as a dividing point on the gray scale distribution curve graph, making a dividing line parallel to the Y axis through the dividing point, dividing the gray scale distribution curve graph into a plurality of areas, and dividing all pixel points positioned in the same area into the same group.
For step S104, specifically: and calculating the gray average value of the pixels in the same group, and taking the gray average value of the pixels in the same group as the gray value of all the pixels in the same group.
For step S105, determining the line drawing sub-paths corresponding to each group according to the positions of the pixel points in each group in the processed image, specifically: connecting adjacent pixel points positioned in the same group to form a first connecting line segment of the same group; each pixel point which is positioned in the same group and has no adjacent point is used as a second connecting line segment of the same group; and taking the first connecting line segment and the second connecting line segment as the same group of drawing sub-paths.
The drawing times of each drawing line sub-path are determined according to the average gray value of each group, and the drawing times are specifically as follows: the number of times of drawing lines is calculated according to the set rules by the different gray values, the number of times of drawing lines corresponding to the average gray value is determined according to the average gray value of each group, and the number of times of drawing lines is used as the number of times of drawing all the drawing line sub-paths in the group. In the drawing process, different gray values are represented by the number of drawing lines, the number of drawing lines corresponding to the higher gray value is smaller, and the light and shade and the shadow of the sketch are represented by the different number of drawing lines.
For step S106, specifically: and arranging and combining the drawing sub-paths of each group and the drawing times of each drawing sub-path, taking the path with the shortest drawing time as a drawing total path, and drawing the sketch of the selected image on drawing paper by using a mechanical arm according to the drawing total path.
It should be appreciated that the brushes used may be, but are not limited to: any one or a combination of a plurality of pencils, carbon pens, carbon pencils, silver pens, sign pens and ball-point pens. The drawing paper used may be, but is not limited to: any one or a combination of a plurality of lead drawing paper, paperboard and watercolor drawing paper.
On the basis of the first embodiment of the present invention, a second embodiment is correspondingly provided.
As shown in fig. 2: the second embodiment of the present invention provides a sketch drawing device including: the system comprises an image acquisition module, a graph drawing module, a pixel point grouping module, a gray value normalization module, a sub-path calculation module and a drawing module;
the image acquisition module is used for acquiring a selected image and carrying out gray processing on the selected image to obtain a processed image;
the curve drawing module is used for establishing a gray level distribution curve graph of all the pixel points of the processed image according to the gray level value of each pixel point of the processed image;
the pixel point grouping module is used for dividing all the pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray level distribution curve graph as a dividing point;
the gray value normalization module is used for normalizing the gray values of the pixel points in the same group to obtain average gray values of the groups;
the sub-path calculation module is used for determining the line drawing sub-paths corresponding to the groups according to the positions of the pixel points in the groups in the processed image, and determining the drawing times of the line drawing sub-paths according to the average gray values of the groups.
The drawing module is used for calculating the total drawing paths according to the drawing sub-paths of each group and the drawing times of each drawing sub-path, and then drawing the sketch of the selected image according to the total drawing paths.
It is to be appreciated that the selected image may be, but is not limited to, a live shot or a picture on a network medium.
Further, the gray value of each pixel point of the processed image is taken as an X axis, and the number of the pixel points corresponding to the gray value is taken as a Y axis to establish a gray distribution curve graph of all the pixel points of the processed image.
Further, the gray scale distribution graph is divided into a plurality of areas by making dividing lines parallel to the Y axis through the dividing points by taking the point of each minimum value as the dividing point, and all the pixel points in the same area are divided into the same group.
Further, the gray average value of the pixels in the same group is calculated, and the gray average value of the pixels in the same group is used as the gray value of all the pixels in the same group.
Further, according to the positions of the pixel points in each group in the processed image, determining the corresponding line drawing sub-paths of each group, specifically: connecting adjacent pixel points positioned in the same group to form a first connecting line segment of the same group; each pixel point which is positioned in the same group and has no adjacent point is used as a second connecting line segment of the same group; and taking the first connecting line segment and the second connecting line segment as the same group of drawing sub-paths.
Further, the number of drawing times of each drawing line sub-path is determined according to the average gray value of each group, specifically: the number of times of drawing lines is calculated according to the set rules by the different gray values, the number of times of drawing lines corresponding to the average gray value is determined according to the average gray value of each group, and the number of times of drawing lines is used as the number of times of drawing all the sub paths of drawing lines in the renter. In the drawing process, different gray values are represented by the number of drawing lines, the number of drawing lines corresponding to the higher gray value is smaller, and the light and shade and the shadow of the sketch are represented by the different number of drawing lines.
Further, the drawing sub-paths of each group and the drawing times of each drawing sub-path are arranged and combined, the path with the shortest drawing time is used as a drawing total path, and then the sketch of the selected image is drawn on the drawing paper according to the drawing total path.
It should be appreciated that the brushes used may be, but are not limited to: any one or a combination of a plurality of pencils, carbon pens, carbon pencils, silver pens, sign pens and ball-point pens. The drawing paper used may be, but is not limited to: any one or a combination of a plurality of lead drawing paper, paperboard and watercolor drawing paper.
The embodiment of the invention carries out gray level processing on the selected picture and extracts the gray level value of each pixel point in the image. Establishing a distribution curve graph according to the gray values of all the pixel points, and dividing all the pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray distribution curve graph as a dividing point; carrying out normalization processing on the gray values of all pixel points positioned in the same group to obtain average gray values of all groups; and determining the drawing times of the drawing sub-paths according to the average gray values of the groups, wherein the drawing times are used for representing key elements of sketch of brightness and shadow of the image during drawing. According to the drawing sub-paths of each group and the drawing times of each drawing sub-path, calculating a drawing total path, and then drawing a sketch of the selected image on a drawing through a mechanical arm according to the drawing total path, so that sketch drawing is automatically carried out, sketch drawing of the selected image is obtained, and automation of sketch drawing is realized.
It should be noted that the apparatus embodiments described above are merely illustrative, and the modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over multiple network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the drawings of the embodiment of the device provided by the invention, the connection relation between the modules represents that the modules have communication connection, and can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art will understand and implement the present invention without undue burden.
The foregoing is a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention and are intended to be comprehended within the scope of the present invention.
Claims (6)
1. A sketch drawing method, characterized by comprising:
acquiring a selected image, and carrying out gray processing on the selected image to obtain a processed image;
establishing a gray level distribution curve graph of all pixel points of the processed image according to the gray level value of each pixel point of the processed image;
dividing all pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray distribution curve graph as a dividing point;
carrying out normalization processing on the gray values of all pixel points positioned in the same group to obtain average gray values of all groups;
determining the corresponding line drawing sub-paths of each group according to the positions of the pixel points in each group in the processed image, and determining the drawing times of each line drawing sub-path according to the average gray value of each group;
arranging and combining the corresponding line drawing sub-paths of each group and the drawing times of each line drawing sub-path, taking the path with the shortest drawing time as a line drawing total path, and drawing a sketch of the selected image according to the line drawing total path;
the determining the line drawing sub-path corresponding to each group according to the position of the pixel point in each group in the processed image comprises the following steps:
connecting adjacent pixel points positioned in the same group to form a first connecting line segment of the same group;
taking each pixel point which is positioned in the same group and has no adjacent point as a second connecting line segment of the same group;
and taking the first connecting line segment and the second connecting line segment as the drawing sub-paths of the same group.
2. The sketch drawing method of claim 1, wherein the gray distribution graph takes a gray value as an X axis and the number of pixels as a Y axis.
3. The sketch drawing method according to claim 1, wherein the normalizing process is performed on the gray values of the pixels located in the same group to obtain average gray values of the groups, specifically:
and calculating the gray average value of the pixels in the same group, and taking the gray average value of the pixels in the same group as the gray value of all the pixels in the same group.
4. A sketch drawing device, characterized by comprising: the system comprises an image acquisition module, a graph drawing module, a pixel point grouping module, a gray value normalization module, a sub-path calculation module and a drawing module;
the image acquisition module is used for acquiring a selected image and carrying out gray processing on the selected image to obtain a processed image;
the curve drawing module is used for establishing a gray level distribution curve graph of all pixel points of the processed image according to the gray level value of each pixel point of the processed image;
the pixel point grouping module is used for dividing all the pixel points of the processed image into a plurality of groups by taking each minimum value point in the gray level distribution curve graph as a dividing point;
the gray value normalization module is used for carrying out normalization processing on the gray values of the pixel points in the same group to obtain average gray values of the groups;
the sub-path calculation module is used for determining the drawing sub-paths corresponding to each group according to the positions of the pixel points in each group in the processed image, and determining the drawing times of each drawing sub-path according to the average gray value of each group; the determining the line drawing sub-path corresponding to each group according to the position of the pixel point in each group in the processed image comprises the following steps: connecting adjacent pixel points positioned in the same group to form a first connecting line segment of the same group; taking each pixel point which is positioned in the same group and has no adjacent point as a second connecting line segment of the same group; the first connecting line segment and the second connecting line segment are used as drawing sub-paths of the same group;
the drawing module is used for arranging and combining the drawing sub-paths corresponding to the groups and the drawing times of the drawing sub-paths, taking the path with the shortest drawing time as a drawing total path, and drawing the sketch map of the selected image according to the drawing total path.
5. The sketch drawing device according to claim 4, wherein the gray distribution graph takes a gray value as an X axis and the number of pixels as a Y axis.
6. The sketch drawing device according to claim 4, wherein the normalization processing is performed on the gray values of the pixels located in the same group to obtain average gray values of the groups, specifically:
and calculating the gray average value of the pixels in the same group, and taking the gray average value of the pixels in the same group as the gray value of all the pixels in the same group.
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| CN109934896B (en) * | 2019-02-25 | 2022-11-15 | 广东智媒云图科技股份有限公司 | Drawing method and device, terminal equipment and computer readable storage medium |
| CN109993810B (en) * | 2019-03-19 | 2023-05-23 | 广东智媒云图科技股份有限公司 | Intelligent sketch drawing method and device, storage medium and terminal equipment |
| CN110349231B (en) * | 2019-05-23 | 2023-04-28 | 广东智媒云图科技股份有限公司 | Drawing method, electronic equipment and storage medium |
| CN110453395B (en) * | 2019-07-19 | 2021-04-09 | 广东智媒云图科技股份有限公司 | Intelligent robot embroidery method, electronic equipment and storage medium |
| CN110570497B (en) * | 2019-08-19 | 2023-06-13 | 广东智媒云图科技股份有限公司 | Drawing method and device based on layer superposition, terminal equipment and storage medium |
| CN111016515A (en) * | 2019-12-19 | 2020-04-17 | 广东智媒云图科技股份有限公司 | Method for automatically drawing through robot, method and device for automatically embroidering |
| CN111260759B (en) * | 2020-01-10 | 2023-02-24 | 北京金山安全软件有限公司 | Path determination method and device |
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| US6236751B1 (en) * | 1998-09-23 | 2001-05-22 | Xerox Corporation | Automatic method for determining piecewise linear transformation from an image histogram |
| JP5246067B2 (en) * | 2009-06-30 | 2013-07-24 | コニカミノルタビジネステクノロジーズ株式会社 | Image processing method and image processing apparatus |
| CN102509357B (en) * | 2011-09-28 | 2014-04-23 | 中国科学院自动化研究所 | Pencil sketch simulating and drawing system based on brush stroke |
| CN103886550B (en) * | 2012-12-24 | 2017-12-01 | 合肥市腾讯信息科技有限公司 | Sketch texture method of adjustment and system |
| TWM512162U (en) * | 2014-12-26 | 2015-11-11 | Univ Chienkuo Technology | Fully automatic image recognition sketch machine carrier |
| CN107705314B (en) * | 2017-11-01 | 2020-07-21 | 齐鲁工业大学 | Multi-object image segmentation method based on gray level distribution |
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