CN113610951A - Automatic tracing method and device - Google Patents
Automatic tracing method and device Download PDFInfo
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- CN113610951A CN113610951A CN202110927883.0A CN202110927883A CN113610951A CN 113610951 A CN113610951 A CN 113610951A CN 202110927883 A CN202110927883 A CN 202110927883A CN 113610951 A CN113610951 A CN 113610951A
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T13/00—Animation
- G06T13/80—2D [Two Dimensional] animation, e.g. using sprites
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- G06T—IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
- G06T11/00—2D [Two Dimensional] image generation
Abstract
The invention provides an automatic tracing method and a device, and the method comprises the steps of scanning a paper freehand line draft into an image file in an electronic format through scanning equipment; analyzing the gray level of each pixel of the image file, and filtering out the pixels with the gray level lower than a preset value to obtain a binary image with bright lines; calculating the coordinates of the central point of each line in the binary image through a subdivision algorithm; collecting coordinates of the central point of each line to form a coordinate set of the central point of each line; popping up a parameter setting panel to the user side so as to enable the user to set image line parameters; and after the user sets the line parameters of the image, redrawing the lines according to the coordinate set of the central point of each line to obtain a vector line draft. The invention has the beneficial effects that: the method has the advantages that the effect that the hand-drawing line draft is automatically converted into the vector line draft in the animation software is realized, both hands of an animator are liberated, and the development efficiency of the outline tracing of the two-dimensional animation product is greatly improved.
Description
Technical Field
The present invention relates to the field of image rendering technologies, and in particular, to an automatic image rendering method and apparatus.
Background
Two-dimensional animation is formed by continuously playing a plurality of still pictures, the common frame rate is 12 frames/second and 24 frames/second, taking 12 frames/second as an example, that is, 12 pictures are required to be made per second, and characters and scenes in each picture are composed of a large number of lines and color filling. In the process of making these lines, the animator needs to refer to the hand drawing manuscript of the original animator, and the drawing is manually performed in the animation software by using a drawing tool. For example, for a ten-minute animation, the frame rate is 12 frames, the required number of pictures is 7200, the manual production of lines in each picture takes a long time, and the quality of the drawn lines is affected by human factors and is uneven.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides an automatic tracing method, aiming at improving the production efficiency of animation works.
In order to solve the technical problems, the invention adopts the technical scheme that: an automatic tracing method comprises the following steps,
s10, scanning the paper hand-drawing line draft into an image file in an electronic format through scanning equipment;
s20, analyzing the gray level of each pixel of the image file, filtering out pixels with gray levels lower than a preset value, and obtaining a binary image with bright lines;
s30, calculating the coordinates of the center point of each line in the binary image through a subdivision algorithm;
s40, collecting coordinates of the central point of each line to form a coordinate set of the central point of each line;
s50, popping up a parameter setting panel to the user side for the user to set the image line parameters;
and S60, after the user sets the line parameters of the image, redrawing the lines according to the coordinate set of the central point of each line to obtain a vector line draft.
Further, step S60 specifically includes,
s61, after the user sets the line parameters of the image, taking the image file in the original electronic format as a bottom image layer, and creating a new line drawing layer on the bottom image layer;
and S62, redrawing the lines on the line drawing layer according to the coordinate set of the central point of each line and the line parameters set by the user to obtain a vector line draft.
Further, step S30 specifically includes calculating coordinates of a center point of each line in the binary image by a subdivision algorithm, and eliminating black pixels of each line except the center point.
Further, in step S10, the format of the image file includes, but is not limited to, jpg format, png format, and bmp format.
Further, in step S50, the line parameters include the color of the line, the thickness of the line, and the smoothing factor of the line.
The invention also provides an automatic tracing device, which comprises,
the picture pixel analysis module is used for scanning the paper hand-drawing line draft into an image file in an electronic format through scanning equipment;
the pixel filtering module is used for analyzing the gray level of each pixel of the image file, filtering out the pixels with the gray level lower than a preset value, and obtaining a binary image with bright lines;
the pixel coordinate analysis module is used for calculating the coordinates of the central point of each line in the binary image through a subdivision algorithm;
the key coordinate collection module is used for collecting the coordinates of the central point of each line to form a coordinate set of the central point of each line;
the parameter setting module is used for popping up a parameter setting panel to the user side so as to enable the user to set the image line parameters;
and the line drawing module is used for redrawing the lines according to the coordinate set of the central point of each line after the line parameters of the image are set by the user, so as to obtain the vector line draft.
Furthermore, the line drawing module specifically comprises,
the image layer establishing unit is used for taking an image file in an original electronic format as a bottom image layer after a user finishes setting line parameters of an image, and newly building a line drawing image layer on the bottom image layer;
and the redrawing unit is used for redrawing the lines on the line drawing layer according to the coordinate set of the central point of each line and the line parameters set by the user to obtain the vector line draft.
Further, the pixel coordinate analysis module is specifically configured to calculate coordinates of a center point of each line in the binary image through a subdivision algorithm, and eliminate black pixels of each line except the center point.
Further, in the picture pixel analysis module, the format of the image file includes, but is not limited to, jpg format, png format, and bmp format.
Further, in the parameter setting module, the line parameters include a color of the line, a thickness of the line, and a smoothing coefficient of the line.
The invention has the beneficial effects that: according to the method, the coordinates of the central point of each line in the binary image are calculated through a subdivision algorithm, the coordinates of the central point of each line are collected to form the coordinate set of the central point of each line, the lines are redrawn according to the coordinate set of the central point of each line to obtain the vector line draft, the effect that the hand-drawn line draft is automatically converted into the vector line draft in the animation software is achieved, the hands of an animator are liberated, and the development efficiency of the two-dimensional animation product outline tracing is greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the mechanisms shown in the drawings without creative efforts.
FIG. 1 is a flow chart of an automated tracing method of an embodiment of the present invention;
fig. 2 is a block diagram of an automatic tracing apparatus according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the description of the invention relating to "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying any relative importance or implicit indication of the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
Referring to fig. 1, a first embodiment of the present invention is: an automatic tracing method includes the following steps that S10, paper hand-drawing line manuscripts are scanned into image files in an electronic format through scanning equipment;
in step S10, the image file format includes, but is not limited to, jpg format, png format, and bmp format.
S20, analyzing the gray level of each pixel of the image file, filtering out pixels with gray levels lower than a preset value, and obtaining a binary image with bright lines;
in this step, the shadow gray scale generated in some scanning or hand-drawing modification processes in the image is low, and the mottle is removed by filtering the pixels with low gray scale, so as to obtain a binary image with clear lines, i.e. an image only retaining two colors of black and white.
S30, calculating the coordinates of the center point of each line in the binary image through a subdivision algorithm;
step S30 specifically includes calculating coordinates of a center point of each line in the binary image by a subdivision algorithm, and eliminating black pixels of each line except the center point.
S40, collecting coordinates of the central point of each line to form a coordinate set of the central point of each line;
although the coordinates of each black pixel can be obtained in steps S30-S40, since the hand-drawn lines are fine and inconsistent, a subdivision algorithm is required to obtain the coordinates of the center point of each line, the subdivision algorithm continuously eliminates the black pixels at the outermost periphery of the line by cycling, only the black pixels at the center of the bottom line are finally retained, and then the coordinates of all the black pixels in the picture are collected, so that the coordinate set of the center point of each line can be obtained.
S50, popping up a parameter setting panel to the user side for the user to set the image line parameters;
in step S50, the line parameters include the color of the line, the thickness of the line, and the smoothing coefficient of the line.
And S60, after the user sets the line parameters of the image, redrawing the lines according to the coordinate set of the central point of each line to obtain a vector line draft.
Wherein, the step S60 specifically includes,
s61, after the user sets the line parameters of the image, taking the image file in the original electronic format as a bottom image layer, and creating a new line drawing layer on the bottom image layer;
and S62, redrawing the lines on the line drawing layer according to the coordinate set of the central point of each line and the line parameters set by the user to obtain a vector line draft.
In step S60, after the user confirms the line parameters, automatically placing the electronic format image file of the line drawing draft on the bottom layer of the animation software, then creating a new line drawing layer, and driving the animation software to complete the drawing of the lines by combining the coordinate set of the center point of each line obtained before, so as to replace manual line-by-line drawing, and simultaneously, the finished product also maintains the format and standard of the hand drawing, so that the next element creating and coloring operation can be performed seamlessly.
In the embodiment, the work of processing the hand-drawn manuscript into the vector line manuscript in the animation software frequently occurs in the two-dimensional animation production process, the coordinate of the central point of each line in the binary image is calculated through a subdivision algorithm, the coordinate of the central point of each line is collected to form the coordinate set of the central point of each line, the lines are redrawn according to the coordinate set of the central point of each line to obtain the vector line manuscript, the hand-drawn line manuscript is automatically converted into the vector line manuscript in the animation production software, the hands of an animator are liberated, and the development efficiency of the two-dimensional animation product outline sketch is greatly improved.
Another embodiment of the present invention, as shown in fig. 2, is an automatic tracing apparatus, comprising,
the picture pixel analysis module 10 is used for scanning the paper hand-drawing line draft into an image file in an electronic format through scanning equipment;
in the picture pixel analysis module 10, the format of the image file includes, but is not limited to, jpg format, png format, and bmp format.
The pixel filtering module 20 is configured to analyze the gray level of each pixel of the image file, and filter out pixels with gray values lower than a preset value to obtain a binary image with bright lines;
the pixel coordinate analysis module 30 is used for calculating the coordinates of the central point of each line in the binary image through a subdivision algorithm;
the pixel coordinate analysis module 30 is specifically configured to calculate coordinates of a central point of each line in the binary image through a subdivision algorithm, and eliminate black pixels of each line except the central point.
The key coordinate collection module 40 is used for collecting the coordinates of the central point of each line to form a coordinate set of the central point of each line;
the parameter setting module 50 is used for popping up a parameter setting panel to the user side so as to enable the user to set the image line parameters;
in the parameter setting module 50, the line parameters include the color of the line, the thickness of the line, and the smoothing coefficient of the line.
And the line drawing module 60 is configured to redraw the lines according to the coordinate set of the central point of each line after the user sets the line parameters of the image, so as to obtain a vector line draft.
Wherein, the line drawing module 60 specifically includes,
the image layer establishing unit is used for taking an image file in an original electronic format as a bottom image layer after a user finishes setting line parameters of an image, and newly building a line drawing image layer on the bottom image layer;
and the redrawing unit is used for redrawing the lines on the line drawing layer according to the coordinate set of the central point of each line and the line parameters set by the user to obtain the vector line draft.
It should be noted that, as can be clearly understood by those skilled in the art, the specific implementation process of the automatic drawing apparatus may refer to the corresponding description in the foregoing method embodiment, and for convenience and brevity of description, no further description is provided herein.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An automatic tracing method is characterized in that: comprises the following steps of (a) carrying out,
s10, scanning the paper hand-drawing line draft into an image file in an electronic format through scanning equipment;
s20, analyzing the gray level of each pixel of the image file, filtering out pixels with gray levels lower than a preset value, and obtaining a binary image with bright lines;
s30, calculating the coordinates of the center point of each line in the binary image through a subdivision algorithm;
s40, collecting coordinates of the central point of each line to form a coordinate set of the central point of each line;
s50, popping up a parameter setting panel to the user side for the user to set the image line parameters;
and S60, after the user sets the line parameters of the image, redrawing the lines according to the coordinate set of the central point of each line to obtain a vector line draft.
2. The automatic tracing method of claim 1, wherein: the step S60 specifically includes the steps of,
s61, after the user sets the line parameters of the image, taking the image file in the original electronic format as a bottom image layer, and creating a new line drawing layer on the bottom image layer;
and S62, redrawing the lines on the line drawing layer according to the coordinate set of the central point of each line and the line parameters set by the user to obtain a vector line draft.
3. The automatic tracing method of claim 1, wherein: step S30 specifically includes calculating coordinates of a center point of each line in the binary image by a subdivision algorithm, and eliminating black pixels of each line except the center point.
4. The automatic tracing method of claim 1, wherein: in step S10, the format of the image file includes, but is not limited to, jpg format, png format, and bmp format.
5. The automatic tracing method of claim 1, wherein: in step S50, the line parameters include the color of the line, the thickness of the line, and the smoothing coefficient of the line.
6. An automatic tracing device, characterized in that: comprises the steps of (a) preparing a mixture of a plurality of raw materials,
the picture pixel analysis module is used for scanning the paper hand-drawing line draft into an image file in an electronic format through scanning equipment;
the pixel filtering module is used for analyzing the gray level of each pixel of the image file, filtering out the pixels with the gray level lower than a preset value, and obtaining a binary image with bright lines;
the pixel coordinate analysis module is used for calculating the coordinates of the central point of each line in the binary image through a subdivision algorithm;
the key coordinate collection module is used for collecting the coordinates of the central point of each line to form a coordinate set of the central point of each line;
the parameter setting module is used for popping up a parameter setting panel to the user side so as to enable the user to set the image line parameters;
and the line drawing module is used for redrawing the lines according to the coordinate set of the central point of each line after the line parameters of the image are set by the user, so as to obtain the vector line draft.
7. The automatic tracing apparatus of claim 6, wherein: the line drawing module specifically comprises a line drawing module,
the image layer establishing unit is used for taking an image file in an original electronic format as a bottom image layer after a user finishes setting line parameters of an image, and newly building a line drawing image layer on the bottom image layer;
and the redrawing unit is used for redrawing the lines on the line drawing layer according to the coordinate set of the central point of each line and the line parameters set by the user to obtain the vector line draft.
8. The automatic tracing apparatus of claim 6, wherein: the pixel coordinate analysis module is specifically used for calculating the coordinates of the central point of each line in the binary image through a subdivision algorithm and eliminating black pixels of each line except the central point.
9. The automatic tracing apparatus of claim 6, wherein: in the picture pixel analysis module, the format of the image file includes, but is not limited to, jpg format, png format, and bmp format.
10. The automatic tracing apparatus of claim 6, wherein: in the parameter setting module, the line parameters comprise the color of the line, the thickness of the line and the smooth coefficient of the line.
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| US20200186672A1 (en) * | 2016-04-28 | 2020-06-11 | Dalian Czur Tech Co., Ltd. | Method for Flattening Laser-based Image of Curved Book Page |
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