Method for detecting monetary banknote and performing currency type analysis operation

• US 8,094,917 B2
• Filed: 04/14/2008
• Issued: 01/10/2012
• Est. Priority Date: 04/14/2008
• Status: Expired due to Fees

• Current Assignee: Primax Electronics Limited
• Original Assignee: Primax Electronics Limited
• Inventors: Liu, Xu-Hua, Kuo, Chung-Chieh, Kwak, Young-Min, Huang, Ying-Jieh
• Primary Examiner(s): Johns, Andrew W
• Application Number:
  US12/102,030
• Publication Number:
  US 20090257641A1
• Time in Patent Office: 1,366 Days
• Field of Search: 382/100, 382/135, 382/165, 382/199, 382/203, 382/226, 382/227, 356/71, 194/207, 434/110
• US Class Current: 382/135
• CPC Class Codes: G07D 7/206 Matching template patterns

Abstract

A method for detecting an image corresponding to at least a monetary banknote is provided. The method includes selecting a detection procedure from a plurality of different detection procedures, and verifying the image according to the selected detection procedure. A method for performing a currency type analysis operation on an image corresponding to at least a monetary banknote is provided. The method includes respectively assigning a plurality of bit values to a plurality of currency types to create a currency type definition table, performing a color analysis operation on the image to generate a color analysis operation result, and determining a currency type of the monetary banknote according to the color analysis operation result and the currency type definition table.

Claims

1. A method for detecting an image corresponding to at least a monetary banknote, comprising:

selecting a detection procedure from a plurality of different detection procedures, wherein the plurality of different detection procedures comprises a low-level detection procedure for determining whether the monetary banknote is a currency or not, a middle-level detection procedure for determining a currency type of the monetary banknote, and a high-level detection procedure for determining a currency type and a currency value of the monetary banknote; and

verifying the image according to the selected detection procedure.

2. The method of claim 1, wherein the low-level detection procedure comprises:

generating a first detection result by performing a color analysis operation on the image; and

verifying the image according to the first detection result.

3. The method of claim 2, wherein the step of verifying the image according to the first detection result comprises:

when the first detection result indicates that the image corresponds to a specific monetary banknote having no boundary, obtaining a shape property of the image; and

verifying the image according to the shape property of the image.

4. The method of claim 3, wherein the specific monetary banknote comprises European currency, Chinese currency, or Taiwanese currency.

5. The method of claim 2, wherein the step of verifying the image according to the first detection result comprises:

when the first detection result indicates that the image corresponds to a specific monetary banknote having a boundary, performing a boundary detection operation on the image and then detecting a texture of the image to generate a second detection result;

when the second detection result indicates that the image corresponds to the specific monetary banknote, obtaining a shape property and a texture property of the image; and

verifying the image according to the shape property and the texture property of the image.

6. The method of claim 5, wherein the specific monetary banknote comprises American currency or Japanese currency.

7. The method of claim 1, wherein the middle-level detection procedure comprises:

generating a first detection result by performing a color analysis operation on the image;

when the first detection result indicates that the image corresponds to a specific monetary banknote having no boundary, obtaining a shape property and a texture property of the image;

verifying the image according to the shape property and the texture property of the image; and

when the image is verified to be a valid monetary banknote, performing a currency type analysis operation on the image.

8. The method of claim 7, wherein the specific monetary banknote comprises European currency, Chinese currency, or Taiwanese currency.

9. The method of claim 1, wherein the middle-level detection procedure comprises:

generating a first detection result by performing a color analysis operation on the image;

when the first detection result indicates that the image corresponds to a specific monetary banknote having a boundary, performing a boundary detection operation on the image to generate a second detection result;

when the second detection result indicates that the image corresponds to the specific monetary banknote, obtaining a shape property and a texture property of the image;

verifying the image according to the shape property and the texture property of the image; and

when the image is verified to be a valid monetary banknote, performing a currency type analysis operation on the image.

10. The method of claim 9, wherein the specific monetary banknote comprises American currency or Japanese currency.

11. The method of claim 1, wherein the high-level detection procedure comprises:

generating a first detection result by performing a color analysis operation on the image;

when the first detection result indicates that the image corresponds to a specific monetary banknote having no boundary, obtaining a shape property and a texture property of the image;

verifying the image according to the shape property and the texture property of the image;

when the image is verified to be a valid monetary banknote, performing a currency type analysis operation on the image and performing a currency value analysis operation on the image.

12. The method of claim 11, wherein the specific monetary banknote comprises European currency, Chinese currency, or Taiwanese currency.

13. The method of claim 1, wherein the high-level detection procedure comprises:

generating a first detection result by performing a color analysis operation on the image;

when the first detection result indicates that the image corresponds to a specific monetary banknote having a boundary, performing a boundary detection operation on the image to generate a second detection result;

when the second detection result indicates that the image corresponds to the specific monetary banknote, obtaining a shape property and a texture property of the image;

verifying the image according to the shape property and the texture property of the image; and

when the image is verified to be a valid monetary banknote, performing a currency type analysis operation on the image and performing a boundary detection operation on the image.

14. The method of claim 13, wherein the specific monetary banknote comprises American currency or Japanese currency.

15. The method of claim 1, further comprising:

performing a down-sampling operation on the image.