Method and system for banknote recognition

• US 20070253615A1
• Filed: 04/26/2006
• Published: 11/01/2007
• Est. Priority Date: 04/26/2006
• Status: Abandoned Application

• Current Assignee: Chung-Yuan Christian University
• Original Assignee: Chung-Yuan Christian University
• Inventors: Wang, Yo-Chen, Chiang, Ya-Wen, Chang, Yuan-Hsiang
• Application Number:
  US11/410,923
• Publication Number:
  US 20070253615A1
• Time in Patent Office: Days
• US Class Current: 382/135
• CPC Class Codes: G06F 18/00 Pattern recognition
• CPC Class Codes: G07D 7/20 Testing patterns thereon G07D7/004, G07D7/005 take precedence

Abstract

A system and a method for banknote recognition are provides. The connected components within a source image are detected when the source image is generated. Then the connected components are used for matching the prototypes in a database for selecting the corresponding best matched prototypes. The connected components will be determined as a first surface or a second surface for representing a banknote according to its best matched prototype. If it is determined as a first surface, the treasury seal recognition and signature recognition will be performed. Finally, the recognition of the image representing a currency value will be performed for determining whether it is a image representing a banknote or not.

Claims

1. A method for banknote recognition, comprising:

matching the feature values of a connected component of a source image with the feature values of a plurality of prototypes in a database for selecting a best matched prototype, wherein said best matched prototype is specified as a first surface or a second surface;

recognizing a treasury seal specified by the best matched prototype within said connected component when said best matched prototype is specified as a first surface;

recognizing an image presenting a currency value within said connected component.

8. A method for banknote recognition of claim 1, wherein said treasury seal recognition comprises:

sampling a sample of said connected component of said source image;

detecting said treasury seal within said sample; and

matching the location of said treasury seal, wherein said treasury seal is recognized when said treasury seal is detected and locates on a predefined location specified by said best matched prototype or an inverted location of said predefined location, wherein said connected component is inverted when said treasury seal locates on said inverted location.

9. A method for banknote recognition of claim 8, wherein said sample is the Cr values of said connected component.

10. A method for banknote recognition of claim 8, wherein said predefined location of said treasury seal and said inverted location are specified within the right side and left side of said source image separately.

11. A method for banknote recognition of claim 8, further comprising:

rotating said connected component through a 180 degree rotation when said treasury seal is on said inverted location.

12. A method for banknote recognition of claim 1, further comprising:

recognizing a signature specified by said best matched prototype within said rectangle image if said best matched prototype is specified as a first surface, wherein said signature is within the right side of said connected component.

13. A method for banknote recognition of claim 1, wherein said first surface and said second surface are a front surface and a back surface representing a banknote separately.

14. A method for banknote recognition of claim 1, wherein the process for selecting said best matched prototype comprises:

generating the sample values which are sampled from the pixels within the connected component;

multiplying the sample values by a number and rounding said sample values to integers;

counting each identical integer to be a feature value;

generating the standard deviations between the feature values of the connected component and the prototypes in the database, wherein each prototype is correspondent to a standard deviation separately; and

selecting the prototype which is correspondent to the minimum standard deviation to be the best matched prototype.

15. A method for banknote recognition of claim 14, wherein said sample values are the hue values of the connected component.

16. A method for banknote recognition of claim 1, further comprising:

outputting said source image with a mark on said connected component which has an image representing said currency value is recognized.

21. A system for banknote recognition of claim 1-7, further comprising:

rotating means for rotating said connected component through a 180 degree rotation when said connected component is inverted;

signature recognizing means for recognizing a signature specified by said best matched prototype, wherein said connected component is not an image representing a banknote when said signature can not be recognized;

marking means for outputting said source image with a mark on said connected component which is recognized as a image representing a banknote.

2. A method for banknote recognition of claim 2, further comprising:

detecting the edges within said source images;

detecting the connected components within said source image according said edges; and

selecting at least one of said connected components for matching said prototypes.

3. A method for banknote recognition of claim 2, further comprising:

generating the binary values of said selected connected component.

4. A method for banknote recognition of claim 3, further comprising:

rotating said connected component through an angle between an edge of said connected component and an axis of a two-dimension space, wherein each of said connected component specifies a rectangle region.

5. A method for banknote recognition of claim 3, wherein the threshold for generating said binary value is between 105 and 180.

6. A method for banknote recognition of claim 3, further comprising:

counting the numbers of a specific value of said binary values within a first portion and a second portion of said source image separately when said best matched prototype is specified as a second surface;

rotating said connected component through a 180 degree rotation when said comparison result between the number of said specific value within said first portion and the number of said specific value within said second portion matches the comparison result specified by the best matched prototype.

7. A method for banknote recognition of claim 6, wherein said first portion and said second portion are the upper half and the lower half of said source image separately.

17. A system for banknote recognition, comprising:

detecting means for receiving a source image and detecting the connected components within said source image;

selecting means for selecting at least one of said connected components for matching a plurality prototypes in a database,

wherein said selected connected components are sent to a matching means;

matching means for generating a set of feature values of a connected component when said connected component is received and selecting a best matched prototype from said database by matching said feature values with the feature values of said prototypes;

treasury seal recognizing means for recognizing a treasury seal specified by said best matched prototype within said connected component;

comparing means for comparing two different portions specified by said best matched prototype of said connected component for determining whether the connected component is inverted or not;

currency value recognizing means for recognizing a currency value specified by said best matched prototype, wherein said connected component is not an image representing a banknote when said currency value can not be recognized;

18. A system for banknote recognition of claim 17, wherein said matching means performs the following procedure for selecting said best matched prototype:

generating the sample values which are sampled from the pixels within the connected component;

multiplying the sample values by a number and rounding said sample values to integers;

counting each identical integer to be a feature value;

generating the standard deviations between the feature values of the connected component and the prototypes in the database; and

selecting the prototype which is correspondent to the minimum standard deviation to be the best matched prototype.

19. A system for banknote recognition of claim 17, wherein said treasury seal recognizing means perform the following procedure for recognizing said treasury seal:

sampling a sample of said connected component of said source image;

detecting said treasury seal within said sample; and

matching the location of said treasury seal, wherein said treasury seal is recognized when said treasury seal is detected and locates on a predefined location specified by said best matched prototype or an inverted location of said predefined location, wherein said connected component is inverted when said treasury seal locates on said inverted location.

20. A system for banknote recognition of claim 17, wherein said performing means perform the following procedure for recognizing said treasury seal:

generating the binary values of said connected component; and

counting the numbers of a specific value of said binary values within a first portion and a second portion of said source image separately when said best matched prototype is specified as a second surface, wherein said connected component is not inverted when said comparison result between the number of said specific value within said first portion and the number of said specific value within said second portion matches the comparison result specified by the best matched prototype.

22. A system for banknote recognition of claim 18, wherein said sample values are the hue values of the connected component.

23. A system for banknote recognition of claim 19, wherein said sample is the Cr values of said connected component.

24. A system for banknote recognition of claim 20, wherein the threshold for generating said binary value is between 105 and 180.