Image processing apparatus using pattern generating circuits to process a color image

• US 5,652,626 A
• Filed: 09/02/1994
• Issued: 07/29/1997
• Est. Priority Date: 09/03/1993
• Status: Expired due to Term

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Kawakami, Haruko, Yamamoto, Naofumi, Sekizawa, Hidekazu
• Primary Examiner(s): Peng, John K.
• Assistant Examiner(s): Flynn, Nathan J.
• Application Number:
  US08/299,970
• Time in Patent Office: 1,061 Days
• Field of Search: 348/461, 348/463, 348/465, 348/467, 348/473, 358/500, 358/540, 358/530, 380/55, 380/54, 355/201, 355/202, 355/326 R, 355/133
• US Class Current: 348/463
• CPC Class Codes: G06T 1/0028 Adaptive watermarking, e.g. Human Visual System [HVS]-based watermarking
• CPC Class Codes: G06T 2201/0051 Embedding of the watermark in the spatial domain
• CPC Class Codes: H04N 1/32208 involving changing the magnitude of selected pixels, e.g. overlay of information or super-imposition H04N1/32219, H04N1/32224 take precedence
• CPC Class Codes: H04N 1/32309 in colour image data
• CPC Class Codes: H04N 1/46 Colour picture communication systems
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes
• CPC Class Codes: H04N 2201/3271 Printing or stamping
• CPC Class Codes: H04N 2201/3278 Transmission

Abstract

In the apparatus for processing a color image, a data signal representing another information differs from the color image is generated by a generating means. The another information is embedded into the color image by varying one of a color difference and a chroma of the color image in accordance with the data signal by an image processing means.

Claims

1. An apparatus for processing a color image, comprising:

means for generating a pattern image based on a data signal to be embedded in the color image; and

image processing means for varying at least one of a color difference signal and a chroma signal of the color image in accordance with the pattern image while keeping a sum of three color component signals of the color image constant so that the color image includes the data signal.

2. The apparatus according to claim 1, wherein said three color component signals are primaries of substructive mixture.

3. The apparatus according to claim 1, wherein said three color component signals are primaries of additive mixture.

4. The apparatus for processing a color image, comprising:

means for generating a pattern image based on information to be embedded in the color image; and

image processing means for varying at least one of a color difference signal and a chroma signal of the color image in accordance with the pattern image so that the color image includes the information, wherein said image processing means includes;

means for converting three color component signals into a luminance signal, and a first and second color difference signals, and

means for embedding the information into the second color difference signal.

5. The apparatus according to claim 4, wherein said first color difference signal is a red-green color difference signal and said second color difference signal is a yellow-blue color difference signal.

6. The apparatus for processing a color image, comprising:

means for generating a pattern image based on information to be embedded in the color image; and

image processing means for varying at least one of a color difference signal and a chroma signal of the color image in accordance with the pattern image so that the color image includes the information, wherein said image processing means includes;

means for converting three color component signals into a luminance signal, and a first and second color difference signals, and

means for embedding the information into the first and second color difference signals.

7. The apparatus according to claim 6, wherein said first color difference signal is a red-green color difference signal and said second color difference signal is a yellow-blue color difference signal.