KR20050023004A - Apparatus and Method for simulating Oriental Painting - Google Patents

Abstract

PURPOSE: A device and a method for simulating an Oriental painting on a graphic computer are provided to draw characteristic brush touch of the Oriental painting in real-time by controlling a pattern change drawn on a screen according to pressure of tablet and speed of a pen mouse. CONSTITUTION: A selection block(60) is provided on a screen of a monitor as a GUI(Graphic User Interface) and allows selection of parameters such as a brush sort/shape, transparency, run, water volume, color, and ink-stick color enabled on a computer system. The selection block includes a color selector(61), a transparency selector(62), a run selector(63), an ink-stick selector(64), a water volume selector(65), an ink-stick palette(66), a brush selector(67), a brush shape selector(68), and a paper selector(69).

Description

Apparatus and Method for simulating Oriental Painting

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus and method for oriental painting simulation, and more particularly, to the development of an oriental painting tool capable of drawing oriental calligraphy or writing calligraphy on a computer screen.

Recently, it is being studied in China, Taiwan and domestic academia, but it has not been developed by commercialization yet. Recently, the Oriental painting, which has been developed in academia, studies the technique of generating images by modeling the tools used in Oriental painting by using the Non Photorealistic Rendering (NPR) method or the study of the input device (HapTic) to obtain more precise brush input values. And expression methods.

However, these academic studies are centered on the theory and theory of mathematical modeling development, using complex physical input devices or high-end computers. Therefore, we are focusing on developing the texture of expression rather than the possibility of commercialization.

Japanese Patent Laid-Open No. 2002-56594 discloses a technique of "a method of forming an ink painting graphic authoring tool." In the present invention, the black color is configured differently according to the inclination of the brush, and the left and right movements of the mouse indicate the shape of the brush tip, and the thickness of the brush is adjusted by the up and down movement.

The purpose of the present invention is to solve the problems of the prior arts by controlling the pattern change of the brush marks depicted on the screen according to the pressure of the tablet and the speed of the pen mouse by the pen mouse in real time, the characteristic brush of oriental painting To provide an apparatus and method for simulating oriental paintings in which a touch is depicted.

It is another object of the present invention to provide a paper-making algorithm which can apply the mixed color of a specific area obtained by adjusting the light and shade to be colored.

Another object of the present invention is to provide a new spreading algorithm that can describe the spreading effect of Hanji in response to the pressure and speed of the brush.

It is another object of the present invention to provide a new watering algorithm for painting by painting water on a brush.

 In order to achieve the above object, the apparatus of the present invention comprises: a paper selector for selecting a paper to be displayed on the screen to simulate an oriental effect on a graphic computer having a rendering tool for selectively identifying position pixels on a screen; A brush shape selection unit for selecting a brush shape centered on the cursor position pixel; A color and function selection unit for selecting ink color, smearing and watering; And color effect generation that generates color effects as a function of the selected oriental paper, brush shape, ink color, bleeding, and watering depending on the pressure and speed of the brush at each cursor position pixel as the cursor position moves across the screen. It is characterized by having a part.

In the present invention, the color effect generation unit comprises a first output unit for repeatedly calculating a corresponding brush thickness pattern among a plurality of brush thickness patterns predetermined according to the pressure of the brush at each cursor position pixel during the stroke of the brush; A second output unit for calculating the stroke width of the brush according to the speed of the brush for each unit length during the stroke, and the ink color of each brush-shaped pixel centered on the cursor position pixel; And a third calculation unit that calculates as a function of the black color previously present at the position of the watering and the calculated pixel.

In the present invention, the brush shape is selected from a plurality of brush stroke patterns optimized for description according to the type of oriental painting.

In the present invention, the black color may be selected from a color palette that uses a gray tone having a high brightness as a basic color and calculates a color according to the radius of the brush by varying the color parameter according to the pressure of the brush.

In the present invention, the bleeding is defined by the first layer portion defining the texture of the selected paper as the first layer, and the second layer as a function of pixel transparency, black color, brush pressure, and stroke path of the brush at the cursor position pixel. A second layer unit, a calculation unit for calculating the third layer by merging the first layer and the second layer, and a brush shape radius and pixel transparency at regular intervals before the brush starts to move at the cursor position pixel. An update unit for updating the second layer as a pseudo-approximation function of pixel transparency, black color, pressure of the brush, stroke stroke of the brush, and repeatedly updating the second layer and calculating the summation to display the third layer on the screen. It includes a control unit.

In the present invention, the water spray includes a selection unit for selecting the amount of water in the brush, a logic end unit for logically multiplying the color value of the cursor position pixel and the gray value having transparency according to the selected amount of water, the logical product value and the neighboring pixel. A filter unit for low-pass filtering the color value of, and the updating unit for updating the low-pass filtered value to the value of the watered cursor position pixel.

The method of the present invention is a method for simulating oriental effect on a graphics computer having a depiction tool for selectively identifying cursor position pixels on a screen.

a) selecting an oriental paper to be displayed on the screen;

b) selecting a brush shape centered on the cursor position pixel;

c) selecting black color, smearing and watering; And

d) generating a color effect that is a function of the selected oriental paper, brush shape, ink color, color bleeding and watering, depending on the pressure and speed of the brush at each cursor position pixel as the cursor position moves across the screen. Characterized in that provided.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

1 shows a computer device for performing the oriental painting tool according to the present invention. The simulated oriental paintings are depicted on the monitor 30 of the computer body 10 by the control of the keyboard 26 and the xy coordinate input device 20 consisting of the pen mouse 22 and the tablet 24. The computer body 10 typically includes a graphics board 12, a controller 14 including a central processing unit (CPU), and a storage unit 16. The graphics board 12 transmits the image information depicted on the monitor 30 to the monitor 30. The controller 14 calculates the pixels to be depicted in the monitor 30. The storage unit 16 may include a semiconductor memory device such as a ROM, a RAM, a flash memory, and a disk storage device such as a hard disk, an optical disk, or a magnetic disk. If the image displayed on the monitor 30 satisfies the artist, it can be printed out through the printer 40 or stored in the storage unit 16, or transmitted to another computer or mobile terminal as an e-mail or image file through the computer communication network 50. Can be.

2 shows a selection block 60 of the oriental simulation apparatus according to the present invention. The selection block 60 is provided on the screen of the monitor 30 in a graphical user interface. The selection block enables selection of parameters such as brush type, brush shape, clarity, degree of bleeding, amount of water, color, black color, etc. which are enabled in the computer system. The selection block 60 includes a color selection unit 61, a transparency selection unit 62, a bleeding degree selection unit 63, a dark color selection unit 64, a water selection unit 65, an ink palette 66, a brush A selection unit 67, a brush shape selection unit 68, and a paper selection unit 69 are included.

The color selection unit 61 is a well-known matrix color selection window provided by a conventional painting tool. In the present invention, 5 × 16 80 basic color blocks 61a and brightness of the selected basic color are displayed. A brightness bar 61b and a display window 61c displaying the currently selected color are included. The basic color blocks 61a include 10 blocks 61a1 in which 10 grays are displayed between white and light gray, and 10 blocks 61a2 in which 10 grays are displayed between dark gray and black. Therefore, in the present invention, the achromatic series is subdivided and displayed in 20 steps to expand the selection of oriental colors.

The transparency selector 62 includes seven levels of transparency selection buttons 62a and a display window 62b for displaying the percentage of transparency. Therefore, transparency can be selected from seven levels: 0%, 33%, 41%, 51%, 51%, 61%, 65%.

The spreading degree selecting unit 63 includes five spreading degree selecting buttons 63a from the spreading step 0 to the spreading step 4 in total.

The dark color selection unit 64 includes a dark color brightness bar 64a and a display window 64b indicating the selected brightness.

The amount of water selector 65 includes a watering selection icon 65a and selection buttons 65b for selecting the amount of water in four steps to adjust the light and shade of ink. Ink tint expresses various effects by controlling the water content. Even the tip of the brush is soaked with water and used for coloring. It applies the water as a coloring element to adjust the color tone. By using the effect of moisture in this way by painting over the image already drawn by absorbing the water in the lower layer can produce the same effect as the spreading effect. This makes the blending effect quite realistic even if many colors are drawn on the lower layer, not just one. This effect reads the color around one pixel of the underlying layer and adds it to it with moisture.

The color palette 66 includes a palette plate 66a and selection icons 66b for selecting the amount of water in four steps, a return button 66c, and an erase button 66d. The pallet plate 66a shows light gray as the base base and the colors are mixed thereon. When the mixed color is selected on the palette plate 66a, the selected color is selected as the brush color. Therefore, colors that are not in the color selection section 61 can also be obtained by mixing them in the palette.

In other words, the color of the ink to produce a variety of colors according to the dog's food (조 法). Five kinds of charcoal, dark, medium, thin, and clear are classified as basic black colors, but complex jokes, not one color, should appear in a single stroke in the operation of the brush. To achieve this color pattern, a color palette is provided that allows you to mix colors and draw a specific color.

The brush selection unit 67 includes a calculation brush 67a, a flat brush 67b, a pattern brush 67c, a pamu brush 67d, a pencil 67e and an eraser 67f.

The calculation brush 67a calculates the real-time pressure to adjust the radius and the width of the spread. The flat brush 67b is a brush which takes a pattern of the brush which has a wide shape on one side, and calculates. The pattern brush 67c deforms and processes various shapes. The pamu ink brush 67d shows a pressed brush or a distorted pattern.

The calculation brush 67a is a calculated brush by a mathematical equation, and is particularly effective in changing the thickness according to the pressure of the brush. It is especially suitable for fast-flowing calligraphic typefaces.

For the brush thickness change according to the pressure of the brush, first, the point of the screen recognized by the computer in the brush drawing is memorized, and the mouse pressure is sensed during the interval, and the brush thickness is calculated according to the pressure.

Equation 1 is a case where the radius of the brush decreases and Equation 2 is an increase. d is the degree of increase or decrease of the radius of the brush, which is related to the pressure and speed of the pen mouse point.

The brush stroke that connects at least two points that the Pen Mouse recognizes This is done recursively from the start point to the end point. In Equation 4 Is the minute interval shifted between recursions.

The brush shape selection unit 68 may include a display window 68a for displaying the thickness of the brush so as to select a plurality of brush shapes according to the selected brush type, an adjustment bar 68b for adjusting the thickness of the brush, and the selected brush type. Various brush shaped icons 68c are included.

Thus, the brush icons 68c change according to the type of the selected brush.

That is, at the time of selecting the calculation brush 67a, three kinds of brush shapes having different diameters can be selected. The thickness of the brush is calculated and displayed by calculating the pressure and velocity from the selected basic diameter. When the flat brush 67b is selected, five kinds of different brush shapes may be selected to describe a flat pattern of the brush tip. At the time of selecting the pattern brush 67c, five kinds of brush shapes having different patterns of brush tips can be selected. Unlike the calculation brush 67a, the pattern brush 67c displays a pattern having a corresponding diameter according to the pressure of the brush while pre-patterning the diameter of the brush shape of a specific pattern, for example, in 12 steps. The pamu ink brush 67d can select three kinds of brush shapes with different patterns in order to show the effect that the brush tip was scattered.

The various brush shapes such as the speed, pressure, and direction according to the movement of the brush to make the shape of the stroke line to reveal a specific method.

This brush pattern application can be provided independently of software. Therefore, the scalability is considerable because it can be provided as a plug-in to a program. Each brush pattern is formed of a boot stroke corresponding to a specific effect when generating oriental paintings. For example, when drawing landscape paintings, the brush strokes were optimized in advance so that the strokes were applied to the pressure of the mouse. In addition, custom-made pattern brush strokes for fine line drawing like eggs were produced and selected for use in creating oriental paintings. It can also provide pattern strokes for various flowers, objects and animals, so it is designed to create various oriental paintings easily and conveniently.

The paper selector 69 can select five types of paper such as window paper and line paper.

Representative algorithms of the oriental painting of the present invention are as follows.

1. The ability to apply the pattern change of the brush according to the pressure and speed of the brush.

When painting with a pressure-sensitive input device such as a pen mouse, there are methods of creating a brush pattern image by calculating a distribution function based on real-time input values and utilizing a pattern image that has already been created.

In the present invention, a method of making a brush pattern, as shown in Figure 3, when the pressure value is small, use a pattern that is relatively light circular, and the larger the pressure value, the darker the darker color, the brush brush is arranged in a distorted pattern The change of coloring pattern according to this enables more realistic expression.

Therefore, the small radius and light color at low pressure and the deep color at high pressure can be treated to increase the effect of fine drawing and coloring, and the calculation time can be saved, thereby real-time processing.

2. The ability to adjust the color of the mix and apply the color of the specific area to the coloring.

In the present invention, a gray tone with high brightness is designated as a base color, and a palating palette is implemented using a method of adjusting a radius of operation according to a kernel size and a pressure value of a low pass filter.

(a) First, the color of the palate palette is set to light gray tones as the base color. This is a way to get rid of the difference in the sum of colors due to the combination of the background color when mixing the black color and to obtain a natural black color.

(b) The RGB value of the first pixel P1 of the brush region of the mouse point is read from the palette and stored in the memory space A as a value of (R1, G1, B1).

(c) R, G, and B values of the pixel P2 adjacent to the first pixel P1 are read and stored in the memory space B as (R2, G2, B2) values.

(d) A low pass filtering operation is performed with R2 read from the pixel P2 adjacent to R1 to generate R12.

(e) G12 is generated by performing a low pass filtering operation and the G2 value read from the pixel adjacent to G1.

(f) Generate B12 by performing the B2 value and the low pass filtering operation read from the pixel adjacent to B1.

(g) Update the RGB value of the first pixel with the generated R12, G12, and B12.

(h) In this way, the RGB values of all the pixels corresponding to the radial region of the brush pattern according to the pressure value of the pen mouse are repeatedly updated by the steps (b) to (g).

(i) Then, iterate over each pixel corresponding to the brush area of the moved mouse point in the same manner as above.

(j) And the kernel specification for low pass filtering is changed according to the pressure of the brush, so the mixing width is adjusted according to the radius of the brush.

The low pass filtering of the present invention described above uses a convolution operation as an image processing algorithm. A convolution operation is an operation that multiplies a pixel to be processed and surrounding pixels with certain weights and adds the respective results to a new pixel value. These weights are called convolution kernels.

Figure 4 shows the type of lowpass filter convolution kernel according to the present invention.

In FIG. 4, as the filter size of the convolution increases, the degree of blurring increases. The more water added, the larger the matrix size of the kernel. By adjusting the size of the kernel, it shows the effect of water addition. The paint radius of the brush is determined according to the pressure value of the pen mouse, and the range of calculation is applied in accordance with the change of the area radius.

Program coding of a preferred embodiment of low pass filtering according to the present invention is as follows.

3. The ability to express smear, which is the main feature of Hanji.

Set the background paper of Oriental painting such as Hanji (window paper) and Chinese paper as the base layer image applied to the calculation, reflect the texture of the background paper to the degree of bleeding, and save the image drawn while the pen mouse is moving in the memory space as a layer. By sequentially changing the value to the background paper color, the merge operation is repeated to implement the bleeding effect.

(a) The image of the Korean paper and the Japanese paper is stored in the memory space as the base layer, that is, the first layer, and the texture of the corresponding paper is applied to the arithmetic processing in response to the selection of the paper.

(b) While the pen mouse is moving, the location of each point, the radius of the brush, the transparency and color corresponding to each pixel are set as the second layer and stored in the memory space.

(c) Merge the first and second layers of the base sheet.

(d) Adjust the location of each point, the radius of the brush, the transparency, color, etc. corresponding to each pixel to a similar approximation value and store it in the memory space as a third layer.

(e) A merge operation is performed in the third layer on the base image merged into the second layer.

(f) The layer is sequentially processed by increasing the radius of the brush at the point and increasing the transparency of the RGB values of each pixel until the new brush coloring (mouse dragging) starts.

(g) Repeat steps (b)-(f) above at predetermined time intervals, eg at 0.2 second intervals.

(h) Apply the movement speed of the brush to the degree of bleeding. If the moving speed is slow, the smear increases, and if the moving speed is fast, the smear decreases.

The coding of the merge operation program of the present invention described above is as follows.

4. Brush painting function

The implementation of the water painting effect reads the RGB value of the first pixel of the brush point of the mouse point from the drawing paper image and stores it in the specified memory. Then, the RGB value of the pixel adjacent to the first pixel is extracted to perform an AND operation with light gray with high transparency to have a watery color, and then the low pass filtering operation described above is performed while enlarging to the surrounding area.

(a) The first pixel R1, G1, B1 value of the brush area of the mouse point is read and stored in the designated memory.

(b) The R2, G2, and B2 values of the pixel neighboring the first pixel are read and stored in the specified memory.

(c) To give the effect of painting, logical operation is performed on each RGB value with light gray RGB value with high transparency.

(d) Performs a low pass filtering operation with R2 read from a pixel adjacent to R1.

(e) Performs low pass filtering operation with G2 read from the pixel adjacent to G1.

(f) Performs a low pass filtering operation with B2 read from the pixel adjacent to B1.

(g) Update the low pass filtered RGB value to the RGB value of the first pixel of the brush region.

(h) As described above, steps (b) to (g) are repeated with respect to the RGB value of the pixel corresponding to the radius of the brush according to the pressure value of the pen mouse.

(i) Then, each pixel corresponding to the brush region of the moved mouse point is continued in the manner described above.

As described above, in the present invention, effects such as the thickness of the brush, the line width, the density of the dark blue color, and the smear can be more realistically expressed in response to the pressure and speed of the pen mouse.

In addition, it can be used in real time because it can reduce the calculation processing time compared to the method applying the conventional calculation algorithm by the function by patterning the brush shape and reading the corresponding pattern in response to the pressure.

BRIEF DESCRIPTION OF THE DRAWINGS The figure for demonstrating the structure of the computer system in which the oriental painting simulation tool by this invention was installed.

FIG. 2 illustrates a preferred embodiment of a graphical user interface screen configuration of the present invention displayed on the monitor screen of FIG.

Figure 3 is a view showing a brush mark radius and black color, the shape change of the brush according to the pressure of the brush pattern according to the present invention.

4 is a view for explaining the type of convolution kernel of low pass filtering of the present invention.

5 to 7 is a view showing the painting examples drawn by the oriental artist with the oriental painting tool according to the present invention.

Claims (12)

1. An apparatus for simulating oriental effects on a graphics computer having a depiction tool for selectively identifying cursor position pixels on a screen, the apparatus comprising: Means for selecting a sheet of paper displayed on the screen; Means for selecting a brush shape centered on the cursor position pixel; Means for selecting dark blue, bleeding and watering; And Means for generating a color effect as a function of the selected oriental paper, brush shape, ink color, bleeding and watering, depending on the pressure and speed of the brush at each cursor position pixel as the cursor position moves across the screen. Oriental painting simulation apparatus, characterized in that. The method of claim 1, wherein the color effect generating means Means for iteratively calculating, during the stroke of the brush, a corresponding brush thickness pattern among a plurality of predetermined brush thickness patterns according to the pressure of the brush at each cursor position pixel; Means for calculating the stroke width of the brush according to the speed of the brush for every unit length during the stroke of the brush; And And a means for calculating the ink color of each brush-shaped pixel centered on the cursor position pixel as a function of the paper, the ink color of the brush, the smearing, the water color, and the ink colors pre-existing at the calculated pixel position. Orientalization simulation apparatus. The method of claim 1, wherein the brush shape Oriental painting simulation apparatus, characterized in that any one of a plurality of brush stroke patterns optimized for description according to the type of oriental painting. The method of claim 1, wherein the black color An oriental painting simulation apparatus, characterized in that it is selected from an ink painting palette that uses a high-brightness gray tone as a basic color and calculates a ink color according to the radius of the brush by varying the ink painting parameters according to the pressure of the brush. The method of claim 1, wherein the water bleeding Means for defining a texture of the selected paper as a first layer; Means for defining a second layer as a function of pixel transparency, black color, brush pressure, brush stroke path at the cursor position pixel; Means for merging the first layer and the second layer to calculate a third layer; Update the second layer as a pseudo-approximation function of pixel transparency, black color, brush pressure, and stroke stroke of the brush by increasing the radius of the brush shape and pixel transparency at regular intervals before the brush starts to move at the cursor position pixel. Means for doing so; And And means for displaying the third layer on the screen by repeatedly updating the second layer and calculating the summation. The method of claim 1, wherein the water spray Means for selecting the amount of water in the brush; Means for logically multiplying a color value of the cursor position pixel with a gray value having transparency in accordance with the selected amount of water; Means for low pass filtering the logical product value and the color value of a neighboring pixel; And means for updating the low pass filtered value to the value of the watered cursor position pixel. CLAIMS 1. A method for simulating oriental effect on a graphics computer having a depiction tool for selectively identifying cursor position pixels on a screen, the method comprising: a) selecting an oriental paper to be displayed on the screen; b) selecting a brush shape centered on the cursor position pixel; c) selecting black color, smearing and watering; And d) generating a color effect that is a function of the selected oriental paper, brush shape, ink color, color bleeding and watering, depending on the pressure and speed of the brush at each cursor position pixel as the cursor position moves across the screen. Oriental painting simulation method characterized in that provided. The method of claim 7, wherein the color effect generation step Repeatedly calculating, during the stroke of the brush, a corresponding brush thickness pattern among a plurality of predetermined brush thickness patterns according to the pressure of the brush at each cursor position pixel; Calculating the stroke width of the brush according to the speed of the brush for every unit length during the stroke of the brush; And Calculating the ink color of each pixel of the brush shape centered on the cursor position pixel as a function of the paper, the ink color of the brush, the smearing, the water color, and the ink colors pre-existing at the calculated position of the pixel. Orientalization simulation method. The method of claim 7, wherein the brush shape Oriental painting simulation method, characterized in that any one of a plurality of brush stroke patterns optimized for description according to the type of oriental painting. The method of claim 7, wherein the black color A method of simulating oriental painting, characterized in that it is selected as a basic color based on a gray tone having a high brightness, and is selected from an ink palette to vary the ink parameters according to the pressure of the brush to calculate the ink color according to the radius of the brush. The method of claim 7, wherein the water bleeding Defining a texture of the selected paper as a first layer; Defining a second layer as a function of pixel transparency, black color, brush pressure, stroke stroke of the brush at the cursor position pixel; Calculating a third layer by merging the first layer and the second layer; Update the second layer as a pseudo approximation function of pixel transparency, black color, brush pressure, and stroke stroke of the brush by increasing the radius of the brush shape and pixel transparency at regular intervals before the brush starts to move at the cursor position pixel. Doing; And And repeating the second layer update and merge calculation to display a third layer on the screen. The method of claim 7, wherein the water spray Selecting the amount of water in the brush; Logically multiplying a color value of the cursor position pixel by a gray value having transparency according to the selected amount of water; Lowpass filtering the AND value and the color values of neighboring pixels; And And updating the low pass filtered value to the value of the watered cursor position pixel.