Apparatus and method for automatically creating a picture in a style having painting-like coloring using an image processing

• US 5,828,819 A
• Filed: 12/26/1995
• Issued: 10/27/1998
• Est. Priority Date: 12/23/1994
• Status: Expired due to Term

• Current Assignee: Electronics and Telecommunications Research Institute, Korea Telecommunication Authority
• Original Assignee: Electronics and Telecommunications Research Institute, Korea Telecommunication Authority
• Inventors: Do, Hyun Sook, Cho, Pyung Dong
• Primary Examiner(s): Nguyen, Phu K.
• Assistant Examiner(s): Vo, Cliff N.
• Application Number:
  US08/578,093
• Time in Patent Office: 1,036 Days
• Field of Search: 395/119, 395/118, 395/129, 395/130, 395/131, 395/133
• US Class Current: 345/604
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77

Abstract

The present invention has the effect that the users can automatically create a natural picture in the style of painting-like color, as if it is a photograph, by directly manufacturing a terminal of a new communication service with the spread of multi media applications and next-generation intelligence network services, and that a lot of memory is not desired in the computer graphics system having three-dimensional model to express an embossed effect by applying the style having painting-like coloring to two-dimensional model.

Claims

1. An apparatus for automatically creating a picture in a style having painting-like coloring, comprising:

a picture input means for receiving two-dimensional picture;

a ground creating means for creating a ground which is relative to complementary color for each pixel of the natural picture input from the picture input means;

a brush position determining means for calculating the gradient vectors using the Gaussian function and brilliance of the natural picture input from the picture input means, and dividing the input picture into small regions, determining the position of the brush using the calculated gradient vectors;

a color converting means for converting the value of brilliance and chroma of the input picture using the RGB value of the natural picture input from the picture input means; and

a paint layer creating means for painting a picture on a computer graphics system using the results from the ground creating means, the brush position determining means and the color converting means, and for repeatedly painting new pictures on the computer graphics system using previously painted picture as a new ground according to the small regions divided by the brush position determining means.

2. A method for automatically creating a picture in a style having painting-like coloring, comprising the steps of:

receiving a two-dimensional natural picture;

creating a ground which is relative to complementary color for each pixel of the natural picture;

calculating the gradient vectors using the Gaussian function and brilliance of the natural picture;

dividing the input picture into small regions, determining the position of the brush using the calculated gradient vectors;

converting the value of brilliance and chroma of the input picture using a color model; and

painting a picture on a computer graphics system using the created ground, the determined brush position, the converted brilliance and chroma, and the shape of the brush which is input from the outside, and repeatedly painting new pictures on the computer graphics system using previously painted picture as a new ground according to the divided small regions.

3. A method in accordance with claim 2, wherein the step of dividing the input picture and determining the position of the brush comprises the steps of:

a) dividing the input picture into small regions;

b) selecting a pixel having the maximum value of the gradient vectors in one of the divided small regions

c) determining the position of the selected pixel as the position of the brush; and

d) executing the step b) and c) with respect to all of the divided small regions.

4. A method in accordance with claim 2, wherein the color model is the HSV color model.

5. A method in accordance with claim 4, wherein the HSV color model increases the values of brilliance and chroma to emphasize a picture in a pointillist representation-like image.

6. A method in accordance with claim 4, wherein the HSV color model increases the values of brilliance and chroma in the edges between the brushes to increase an embossed effect.

7. A method in accordance with claim 4, wherein the value of brilliance has a range of 1.25×

S (S;

Chroma of the HSV color model) through 1.7×

S.

8. A method in accordance with claim 4, wherein the value of brilliance has a range of 1.2×

V (V;

brilliance of the HSV color model) through 1.5×

V.

9. An apparatus for automatically creating a picture in a style having painting-like coloring, comprising:

a picture input means for receiving a two-dimensional natural picture;

a color converting means for converting the value of brilliance and chroma using the RGB value of the natural picture input from the picture input means;

a brush direction/size determining means for dividing the input picture into small regions, and for calculating the gradient vectors for the divided small regions using the Gaussian function and brilliance of the natural picture input from the picture input means, and determining the size of the brush using the calculated gradient vectors of the pixels in each of the divided small regions, and determining the direction of the brush by calculating the angles of the gradient vectors for the x-axis in each of the divided small regions; and

a picture creating means for painting a new picture on the computer graphics system using the results from the color converting means and the brush direction/size determining means.

10. A method for automatically creating a picture in a style having painting-like coloring, comprising the steps of:

a) receiving input picture from an image scanner;

b) calculating gradient vectors using brilliance, and dividing the input picture into first regions, and sorting the divided small regions;

c) setting up second regions to be processed;

d) determining the position and size of the brush;

e) painting a new picture on the computer graphics system using a color model which converts brilliance and chroma of the input picture.

11. A method in accordance with claim 10, wherein the step of d) comprises the steps of:

1) dividing the first regions into second regions having the size to be processed;

2) calculating the angles of the gradient vectors of each pixel in the second regions for x-axis;

3) classifying the angles into a plurality of sections;

4) calculating the distribution of the angles and selecting the value of the section having the most frequency in angle;

5) determining the direction of the brush according to the value of the section having the most frequency in angle;

6) determining the size of the brush base on the sorted regions at step of b); and

7) determining the direction and size of the brush regarding all of the second regions by repeatedly performing the steps of

     1) to

     6).

12. A method in accordance with claim 10, wherein the division of the first regions is performed by the region growing method which selects the region division in the range of color 40 (0-360), chroma 0.3 (0.0-1.0), brilliance 10 (1-255).

13. A method in accordance with claim 11, wherein the angles are classified into six sections comprising:

the first section which is not less than 70 degrees or is not more than -70 degrees;

the second section which is not less than 40 degrees and is not more than 70 degrees;

the third section which is not less than 10 degrees and is not more than 40 degrees;

the fourth section which is not less than -10 degrees and is not more than 10 degrees;

the fifth section which is not less than -40 degrees and is not more than -10 degrees; and

the sixth section which is not less than -70 degrees and is not more than -40 degrees.

14. A method in accordance with claim 10, wherein the color model is the HSV color model.

15. A method in accordance with claim 14, wherein the HSV color model increases the values of brilliance and chroma to emphasize the style of oil painting.

16. A method in accordance with claim 14, wherein the HSV color model increases the values of brilliance and decreases the values of chroma to emphasize the style of water-color painting.

17. A method in accordance with claim 14, wherein the HSV color model increase the values of brilliance and chroma in the edges between the brushes to increase an embossed effect.

18. A method for automatically creating a picture in a style having painting-like coloring, comprising the steps of:

a) receiving a two-dimensional natural picture;

b) converting the value of brilliance and chroma using the RGB value of the natural picture input;

c) dividing the input picture into small regions, and for calculating the gradient vectors for the divided small regions using the Gaussian function and brilliance of the natural picture input, and determining the size of the brush using the calculated gradient vectors of the pixels in each of the divided small regions, and determining the direction of the brush by calculating the angles of the gradient vectors for the x-axis in each of the divided small regions; and

d) painting a new picture on the computer graphics system using the determined direction and size of the brush, the converted brilliance and chroma.