Image processing apparatus and controller apparatus using thereof

• US 20040169889A1
• Filed: 02/27/2003
• Published: 09/02/2004
• Est. Priority Date: 02/27/2003
• Status: Abandoned Application

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation), Toshiba Tec Corporation (Toshiba Corporation)
• Original Assignee: Toshiba Tec Corporation (Toshiba Corporation)
• Inventors: Sawada, Takayuki
• Application Number:
  US10/373,790
• Publication Number:
  US 20040169889A1
• Time in Patent Office: Days
• US Class Current: 358/2.1
• CPC Class Codes: H04N 1/6072 adapting to different types of images, e.g. characters, graphs, black and white image portions
• CPC Class Codes: H04N 1/628 Memory colours, e.g. skin or sky

Abstract

This invention provides an image processing apparatus comprising a color distribution analyzing portion for analyzing color distribution of an inputted color image, an image content judgment portion for judging the content of a color image based on the analyzed color distribution, a color conversion parameter determining portion for determining a color conversion parameter based on the judged image content, and a color conversion portion which executes color conversion upon a color image based on this color conversion parameter.

Claims

1. An image processing apparatus comprising:

A color distribution analyzing portion for analyzing a color distribution of an inputted color image;

an image content judgment portion for judging the content of the inputted color image based on the color distribution analyzed by the color distribution analyzing portion;

a color conversion parameter determining portion for determining the color conversion parameter based on the image content judged by the image content judgment portion; and

a color conversion portion for executing color conversion upon the inputted color image based on the color conversion parameter determined by the color conversion parameter determining portion.

2. An image processing apparatus according to claim 1, wherein the image content judgment portion judges the content of the inputted color image to be at least one of human figure, natural scenery image and graphic.

3. An image processing apparatus comprising:

an image object extracting portion for extracting an image in a predetermined image object region from an inputted color image;

a color distribution analyzing portion for analyzing color distribution of the image in the image object region extracted by the image object extracting portion;

an image content judgment portion for judging the content of the image in the image object region based on the color distribution analyzed by the color distribution analyzing portion;

a color conversion parameter determining portion for determining a color conversion parameter based on the image content judged by the image content judgment portion; and

a color conversion portion for executing color conversion upon the image in the image object region based on the color conversion parameter determined by the color conversion parameter determining portion.

4. An image processing apparatus according to claim 3, wherein the image content judgment portion judges the content of an image in the image object region to be at least one of human figure, natural scenery image and graphic.

5. An image processing apparatus comprising:

a spatial feature extracting portion for extracting local spatial features from an entire range of an inputted color image;

a spatial feature judgment portion for judging the spatial features extracted by the spatial feature extracting portion;

a color conversion parameter determining portion for determining a color conversion parameter based on a judgment result of the spatial feature judgment portion; and

a color conversion portion for executing color conversion upon the inputted color image based on the color conversion parameter determined by the color conversion parameter determining portion.

6. An image processing apparatus according to claim 5, wherein the spatial feature judgment portion judges that a specific region of the inputted color image is a logo mark based on spatial features extracted by the spatial feature extracting portion.

7. An image processing apparatus comprising:

a specific color conversion table generating portion in which while a specific color of an inputted color image undergoes color conversion using a specific color conversion table, when the color conversion is executed upon a color image other than the specific color using a default color conversion table, the specific color conversion table is generated by changing values of nearby entries surrounding the color coordinate of the specific color in the default color conversion table; and

a color conversion portion which when at least part of the inputted color image is the specific color, the inputted color image undergoes color conversion based on the specific color conversion table generated by the specific color conversion table generating portion.

8. An image processing apparatus according to claim 7, wherein in the specific color conversion table generated by the specific color conversion table generating portion, the nearby entries are supplied with an equal moving amount to the moving amount of the specific color.

9. An image processing apparatus according to claim 7, wherein in the specific color conversion table generated by the specific color conversion table generating portion, the nearby entries are converted to the same color information as color information after the conversion of the specific color.

10. An image processing apparatus comprising:

a specific color conversion table generating portion in which while a specific color of an inputted color image undergoes color conversion using a specific color conversion table, when the color conversion is executed upon a color image other than the specific color using a default color conversion table, the specific color conversion table is generated by providing multiple nearby entries at equal positions from the color coordinate of the specific color and then changing values of the entries in the default color conversion table; and

a color conversion portion which when at least part of the inputted color image is the specific color, the inputted color image undergoes color conversion based on the specific color conversion table generated by the specific color conversion table generating portion.

11. An image processing apparatus according to claim 10, wherein in the specific color conversion table generated by the specific color conversion table generating portion, the nearby entries are supplied with an equal moving amount to the moving amount of the specific color.

12. An image processing apparatus according to claim 10, wherein in the specific color conversion table generated by the specific color conversion table generating portion, the nearby entries are converted to the same color information as color information after the conversion of the specific color.

13. A controller apparatus comprising:

a scanner portion for outputting a color image which is a scanner RGB signal by scanning an original image;

a PCS generating portion for converting color image which is the scanner RGB signal supplied from the scanner portion to color image which is L* a* b* signal;

a color distribution analyzing portion for analyzing color distribution of color image which is the L* a* b* signal supplied from the PCS generating portion;

an image content judgment portion for judging the content of the inputted color image based on the color distribution analyzed by the color distribution analyzing portion;

a color conversion parameter determining portion for determining color conversion parameter based on an image content judged by the image content judgment portion;

a color conversion portion for executing color conversion upon the inputted color image based on the color conversion parameter determined by the color conversion parameter determining portion; and

an RGB generating portion which receives the converted color image which is the L* a* b* signal supplied from the color conversion portion and generates and outputs standard RGB signal.

14. A controller apparatus comprising:

an RIP processing portion which receives a color image of page description language, executes PDL analysis and outputs a printer signal;

a PCS generating portion for converting to color image which is L* a* b* signal based on the printer signal from the RIP processing portion;

a color distribution analyzing portion for analyzing color distribution of color image which is the L* a* b* signal supplied from the PCS generating portion;

an image content judgment portion for judging the content of the inputted color image based on the color distribution analyzed by the color distribution analyzing portion;

a color conversion parameter determining portion for determining color conversion parameter based on an image content judged by the image content judgment portion;

a color conversion portion for executing color conversion upon the inputted color image based on the color conversion parameter determined by the color conversion parameter determining portion; and

a printer color signal generating portion which receives the converted color image which is the L* a* b* signal supplied from the color conversion portion and outputs a printer color signal.