Image processing system for selectively reproducing documents

• US 5,515,451 A
• Filed: 10/07/1993
• Issued: 05/07/1996
• Est. Priority Date: 10/08/1992
• Status: Expired due to Fees

• Current Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Original Assignee: Fuji Xerox Company Limited (Fujifilm Holdings Corporation)
• Inventors: Seki, Masao, Nakaya, Fumio, Shinohara, Koichiro, Aikawa, Koji, Tsuji, Masato, Leng, Svay
• Primary Examiner(s): Boudreau, Leo
• Assistant Examiner(s): Bella, Matthew C.
• Application Number:
  US08/132,983
• Time in Patent Office: 943 Days
• Field of Search: 382/7, 382/17, 382/38, 382/62, 382/135, 382/138, 382/165, 382/164, 382/203, 902/7, 235/464, 355/201
• US Class Current: 382/135
• CPC Class Codes: G03G 21/046 by discriminating a special original, e.g. a bank note
• CPC Class Codes: G06K 7/12 using a selected wavelength, e.g. to sense red marks and ignore blue marks
• CPC Class Codes: G06K 7/14 using light without selection of wavelength, e.g. sensing reflected white light G06K7/10831 - G06K7/1097 take precedence
• CPC Class Codes: G07D 7/12 Visible light, infrared or ultraviolet radiation
• CPC Class Codes: H04N 1/00843 based on recognising a copy prohibited original, e.g. a banknote pattern authentication and markers therefor, forgery detection G06V20/95; character recognition G06V30/10; document-oriented image-based pattern recognition G06V30/40; testing paper currency or similar valuable papers for genuineness G07D7/00
• CPC Class Codes: H04N 1/00846 based on detection of a dedicated indication, e.g. marks or the like
• CPC Class Codes: H04N 1/00864 Modifying the reproduction, e.g. outputting a modified copy of a scanned original details of composing or otherwise geometrically modifying originals H04N1/387
• CPC Class Codes: H04N 1/00867 with additional data, e.g. by adding a warning message details of embedding additional information in an image H04N1/32144
• CPC Class Codes: H04N 1/0087 with hidden additional data, e.g. data invisible to the human eye
• CPC Class Codes: H04N 1/00872 by image quality reduction, e.g. distortion or blacking out
• CPC Class Codes: H04N 1/00875 Inhibiting reproduction, e.g. by disabling reading or reproduction apparatus

Abstract

An image processing system which reads, in pixel units, an image on an original document using a scanner, processes the read image data, and outputs the processed image data. The image processing system includes a system for recognizing a circular image of a specific color. The recognizing system includes a specific color detecting unit for detecting a specific color on an image on an original document; a first image detecting unit for detecting, in the image detected by the specific color detecting unit, images of the specific color at positions spaced from each other by a first distance corresponding to a diameter of a circle on a line extending in a fast scan direction; a second image detecting unit for detecting intersections of the circle having the diameter equal to the first distance and a line separated by a predetermined distance from a center of the circle in a slow scan direction when the specific color images are detected by the first image detecting unit; and a specific color image determining unit for determining that a contour containing the images of the specific color, detected by the three detecting units, is circular on the basis of the detection of a pitch line of a second distance by the second image detecting unit.

Claims

1. In an image processing system which reads, in pixel units, an image on an original document using a scanner, processes the read image data, and outputs the processed image data, said image processing system comprising a system for recognizing a circular image of a specific color, said recognizing system comprising:

specific color detecting means for detecting a specific color on an image on an original document;

first image detecting means for detecting, in the image on the original document, portions of the image of the detected specific color that are at positions spaced from each other by a first distance corresponding to a diameter of a circle on a line extending in a fast scan direction;

second image detecting means for detecting intersections of the circle having the diameter equal to the first distance and a line separated by a predetermined distance from a center of the circle in a slow scan direction when the portions of the image of the specific color are detected by said first image detecting means; and

specific color image determining means for determining that a contour containing the portions of the image of the specific color, detected by said specific color detecting means, said first image detecting means, and said second image detecting means, is circular on the basis of the detection of a pitch line of a second distance by said second image detecting means.

2. In an image processing system which reads, in pixel units, an image on an original document using a scanner, processes the read image data, and outputs the processed image data, said image processing system comprising a system for recognizing a circular image of a specific color, and said recognizing system comprising:

specific color detecting means for detecting a specific color on an image on an original document;

first image detecting means for detecting, in the image on the original document, portions of the image of the detected specific color that are at positions spaced from each other by a first distance corresponding to a diameter of a circle on a line extending in a fast scan direction;

second image detecting means for detecting intersections of the circle having the diameter equal to the first distance and a line separated by a predetermined distance from a center of the circle in a slow scan direction when the portions of the image of the specific color are detected by said first image detecting means; and

specific color image determining means for determining that a contour containing the portions of the image of the specific color, detected by said specific color detecting means, said first image detecting means, and said second image detecting means, is circular when the number of pixels within a given area defined by a set of lines detected by said second image detecting means is within a specific number of pixels previously stored in a memory means.

4. The image processing system according to claim 2, wherein said specific color is red, the following equation holds

6. The image processing system according to claim 2, wherein said recognizing system is provided an image output means to which an image signal read by an external scanner is applied.

8. The image processing system according to claim 2, further comprising a magnetic sensor, disposed within a platen cover, for sensing magnetic flux from the original document.

3. In an image processing system which reads, in pixel units, an image on an original document using a scanner, processes the read image data, and outputs the processed image data, said image processing system comprising a system for recognizing a circular image of a specific color, and said recognizing system comprising:

specific color detecting means for detecting a specific color on an image on an original document;

first image detecting means for detecting, in the image on the original document, portions of the image of the detected specific color that are at positions spaced from each other by a first distance corresponding to a diameter of a circle on a line extending in a fast scan direction;

second image detecting means for detecting intersections of the circle having the diameter equal to the first distance and a line separated a predetermined distance from a center of the circle in a slow scan direction when the portions of the image of the specific color are detected by said first image detecting means; and

specific color image determining means for determining that a contour containing the portions of the image of the specific color, detected by said specific color detecting means, said first image detecting means, and said second image detecting means, is circular when the number of changes between ON and OFF of pixels within a given area defined by a set of lines detected by said second image detecting means is within a specific number of changes between ON and OFF previously stored in a memory means.

5. The image processing system according to claim 3, wherein said specific color is red, the following equation holds

7. The image processing system according to claim 3, wherein said recognizing system is provided an image output means to which an image signal read by an external scanner is applied.