Image recognition method and device and copier and scanner employing same

• US 6,188,787 B1
• Filed: 04/07/1997
• Issued: 02/13/2001
• Est. Priority Date: 04/05/1996
• Status: Expired due to Term

• Current Assignee: Hanger Solutions, LLC (IP Investments Group LLC)
• Original Assignee: Omron Corporation
• Inventors: Kinoshita, Ikuo, Nakamura, Hitoshi, Sonoda, Shinya, Hiraishi, Junji, Ohmae, Kouichi
• Primary Examiner(s): Chang, Jon
• Application Number:
  US08/826,701
• Time in Patent Office: 1,408 Days
• Field of Search: 382/162, 382/165, 382/317, 382/135, 382/100, 380/5, 399/366, 283/72, 283/901
• US Class Current: 382/165
• CPC Class Codes: G03G 21/046 by discriminating a special original, e.g. a bank note
• CPC Class Codes: G07D 7/20 Testing patterns thereon G07D7/004, G07D7/005 take precedence
• CPC Class Codes: H04N 1/00846 based on detection of a dedicated indication, e.g. marks or the like
• CPC Class Codes: H04N 1/00875 Inhibiting reproduction, e.g. by disabling reading or reproduction apparatus

Abstract

An image recognition method and device detects an object mark reliably even when the mark is defaced with a different color. RGB signals are transmitted to color extraction unit. The color extraction unit has a characteristic color extraction block to extract the characteristic color of the object mark. A binary image is generated from the extracted pixels which are the color of the mark and stored in storage device. A mark detection unit detects the location of the mark in the stored image data and an image extraction unit extracts the region where the mark is located and obtains a feature count. A matching unit compares the feature count with a reference pattern and finds the goodness of fit. A control unit subjects the goodness of fit value to threshold value processing to determine whether this is a nonreproducible document. If the mark has been defaced with black ink, the pixels constituting the mark are extracted by a likely color extraction block. A binary image is generated and stored in storage device. Thus, the defaced mark can undergo the same recognition processing as the normal mark, and both can be recognized.

Claims

1. An image recognition method for recognizing an object mark in scanned object image data which is on an original nonreproducible document, comprising the steps of:

scanning an image to obtain object image data which includes said object mark;

detecting a presence of a first color in said scanned object image data which is identical to an object color of said object mark on said original nonreproducible document by analyzing three color components, said first color being detected when all of said three color components are respectively identical to a corresponding predetermined color density;

detecting a presence of a second color in said scanned object image data which is a different color from an object color of said object mark on said original nonreproducible document by analyzing three color components, said second color being detected when all of said three color components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color; and

providing an output signal if either said first or second colors are detected in said scanned object image data, wherein said detecting steps are performed in parallel.

2. An image recognition method according to claim 1, wherein said second color which is a different color from said object color is detected when one of said three color components in said scanned object image data is different from a corresponding color component of said object color, and two of said three color components are identical to the corresponding color components.

3. An image recognition method according to claim 1, wherein said second color which is a different color from said object color is detected when two of said three color components in said scanned object image data are different from corresponding color components of said object color, and one of said three color components is identical to the corresponding color component.

4. An image recognition method according to claim 1, wherein said second color in said scanned object image data is black.

5. An image recognition device to recognize an object mark in object image data which is in an original nonreproducible document, comprising:

a first color detection means to detect a presence of a first color in said scanned object image data which is identical to an object color of said object mark on said original nonreproducible document by analyzing three color components, said first color being detected when all of said three color components are respectively identical to a corresponding predetermined color density, said first color detection means having a first detection output; and

a second color detection means to detect a presence of a second color in said scanned object image data which is a different color from an object color of said object mark on said original nonreproducible document by analyzing three color components, said second color being detected when all of said three color components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color, said second color detection means having a second detection output,

wherein a logical sum of said first and second detection outputs is used to provide an output signal if either said first or second colors are detected in said scanned object image data.

6. An image recognition device according to claim 5, wherein said second color which is a different color from said object color is detected when one of said three color components in said scanned object image data is different from a corresponding color component of said object color, and two of said three color components are identical to the corresponding color components.

7. An image recognition device according to claim 5, wherein said second color which is a different color from said object color is detected when two of said three color components in said scanned object image data are different from corresponding color components of said object color, and one of said three color components is identical to the corresponding color component.

8. An image recognition device according to claim 5, wherein said second color detection means detects a color of black in said object image data.

9. A copy machine to copy object image data, comprising:

an image recognition device to recognize an object mark in scanned object image data which is in an original nonreproducible document,

a first color detection means to detect a presence of a first color in said scanned object image data which is identical to an object color of said object mark on said original nonreproducible document by analyzing three color components, said first color being detected when all of said three color components are respectively identical to a corresponding predetermined color density, said first color detection means having a first detection output; and

a second color detection means to detect a presence of a second color in said scanned object image data which is a different color from an object color of said object mark on said original nonreproducible document by analyzing three color components, said second color being detected when all of said three color components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color, said second color detection means having a second detection output,

wherein a logical sum of said first and second detection outputs is used to provide an output signal if either said first or second colors are detected in said scanned object image data.

10. A copy machine according to claim 9, wherein said output signal controls a copy process.

11. A scanner to scan an object image data comprising:

an image recognition device to recognize an object mark in scanned object image data which is in an original nonreproducible document;

a first color detection means to detect a presence of a first color in said scanned object image data which is identical to an object color of said object mark on said original nonreproducible document by analyzing three color components, said first color being detected when all of said three color components are respectively identical to a corresponding predetermined color density, said first color detection means having a first detection output; and

a second color detection means to detect a presence of a second color in said scanned object image data which is a different color from an object color of said object mark on said original nonreproducible document by analyzing three color components, said second color being detected when all of said three color components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color, said second color detection means having a second detection output,

wherein a logical sum of said first and second detection outputs is used to provide an output signal if either said first or second colors are detected in said scanned object image data.

12. A scanner according to claim 11, wherein said output signal controls reproduction of the object mark.

13. An image recognition method for recognizing an object mark in scanned object image data which is on an original nonreproducible document, comprising the steps of:

scanning an image to obtain object image data which includes said object mark;

detecting a presence of a first reference color in said scanned object image data of said object mark by analyzing three color components, said first reference color being identical to an object color of said object mark and being detected when all of said three components are respectively identical to a corresponding predetermined color density;

detecting a presence of a second reference color in said scanned object image data which is different from said first reference color by analyzing three color components, said second reference color being detected when all of said three components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color; and

providing an output signal if said first or second reference colors are detected in said scanned object image data, wherein said detecting steps are performed in parallel.

14. An image recognition device to recognize an object mark in scanned object image data which is in an original nonreproducible document, comprising:

a first color detection means for detecting a presence of a first reference color in said scanned object image data of said object mark by analyzing three color components, said first reference color being identical to an object color of said object mark and being detected when all of said three components are respectively identical to a corresponding predetermined color density, said first color detection means having a first detection output; and

a second color detection means for detecting a presence of a second different reference color in said scanned object image data of said object mark by analyzing three color components, said second reference color being detected when all of said three components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color, said second color detection means having a second detection output,

wherein a logical sum of said first and second detection outputs is used to provide an output signal if either said first or second reference colors are detected in said scanned object image data.

15. A copy machine to copy object image data, comprising:

an image recognition device to recognize an object mark in scanned object image data which is in an original nonreproducible document,

a first color detection means for detecting a presence of a first reference color in said scanned object image data of said object mark by analyzing three color components, said first reference color being identical to an object color of said object mark and being detected when all of said three components are respectively identical to a corresponding predetermined color density, said first color detection means having a first detection output, and

a second color detection means for detecting a presence of a second different reference color in said scanned object image data of said object mark by analyzing three color components, said second reference color being detected when all of said three components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color, said second color detection means having a second detection output,

wherein a logical sum of said first and second detection outputs is used to provide an output signal if either said first or second reference colors are detected in said scanned object image data.

16. A scanner to scan an object image data comprising:

an image recognition device to recognize an object mark in scanned object image data which is in an original nonreproducible document,

a first color detection means for detecting a presence of a first reference color in said scanned object image data of said object mark by analyzing three color components, said first reference color being identical to an object color of said object mark and being detected when all of said three components are respectively identical to a corresponding predetermined color density, said first color detection means having a first detection output, and

a second color detection means for detecting a presence of a second different reference color in said scanned object image data of said object mark by analyzing three color components, said second reference color being detected when all of said three components are respectively within a corresponding predetermined color density range, each predetermined color density range representing a range of predictable color alterations of said object color, said second color detection means having a second detection output,

wherein a logical sum of said first and second detection outputs is used to provide an output signal if either said first or second reference colors are detected in said scanned object image data.