Image detecting method and system thereof

• US 8,837,772 B2
• Filed: 05/19/2009
• Issued: 09/16/2014
• Est. Priority Date: 10/22/2008
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Lin, Chih-Wei, Shih, Ming-Yu, Tang, Tsann-Tay
• Primary Examiner(s): Bella, Matthew
• Assistant Examiner(s): BROOKS, JULIAN D
• Application Number:
  US12/468,224
• Publication Number:
  US 20100098292A1
• Time in Patent Office: 1,946 Days
• Field of Search: 382/103, 382/171, 382/178, 382/199, 382/181, 382/202, 348/148, 348/154, 348/155, 348/169
• US Class Current: 382/103
• CPC Class Codes: G06V 10/462 Salient features, e.g. scale invariant feature transforms [SIFT]
• CPC Class Codes: G06V 20/52 Surveillance or monitoring of activities, e.g. for recognising suspicious objects recognising microscopic objects G06V20/69

Abstract

An image detecting method and a system thereof are provided. The image detecting method includes the following steps. An original image is captured. A moving-object image of the original image is created. An edge-straight-line image of the original image is created, wherein the edge-straight-line image comprises a plurality of edge-straight-lines. Whether the original image has a mechanical moving-object image is detected according to the length, the parallelism and the gap of the part of the edge-straight-lines corresponding to the moving-object image.

Claims

1. An image detecting method, comprising:

capturing an original image;

creating a moving-object image of the original image;

creating an edge-straight-line image of the original image, wherein the edge-straight-line image comprises a plurality of edge-straight-lines; and

detecting whether the original image has a mechanical moving-object image according to the length, the parallelism and a gap of the part of the edge-straight-lines corresponding to the moving-object image;

wherein the step of detecting comprises detecting whether the moving-object image is the mechanical moving-object according to the sum of each product of a value of a relative length and a value of a relative gap of each group of the edge-straight-lines which are parallel to each other.

2. The image detecting method according to claim 1, wherein in the step of creating the moving-object image, the moving-object image is created according to a gradient image of the original image.

3. The image detecting method according to claim 2, wherein the gradient image comprises a horizontal gradient value, a vertical gradient value and a cross gradient value.

4. The image detecting method according to claim 1, wherein the step of creating the moving-object image comprises:

creating a background model;

creating a foreground image; and

connecting the foreground image to form the moving-object image.

5. The image detecting method according to claim 1, wherein in the step of creating the edge-straight-line image, the edge-straight-line image is created according to a gradient image of the original image.

6. The image detecting method according to claim 5, wherein the gradient image comprises a horizontal gradient value and a vertical gradient value.

7. The image detecting method according to claim 1, wherein the step of creating the edge-straight-line image comprises:

creating an edge line image of the original image;

creating an edge angle image of the original image; and

cutting the edge line image and the edge angle image to form the edge-straight-line image.

8. An image detecting system, comprising:

an image capturing unit for capturing an original image;

a moving-object image creating unit for creating a moving-object image of the original image;

an edge-straight-line image creating unit for creating an edge-straight-line image of the original image, wherein the edge-straight-line image comprises a plurality of edge-straight-lines; and

a detecting unit for detecting whether the original image has a mechanical moving-object image according to the length, the parallelism and a gap of the part the edge-straight-lines corresponding to the moving-object image;

wherein the detecting unit detects whether the moving-object image is the mechanical moving-object image according to the sum of a product of a value of a relative length and a value of a relative gap of each group of the edge-straight-lines which are parallel to each other.

9. The image detecting system according to claim 8, wherein the moving-object image creating unit creates the moving-object image according to a gradient image of the original image.

10. The image detecting system according to claim 9, wherein the gradient image comprises a horizontal gradient value, a vertical gradient value and a cross gradient value.

11. The image detecting system according to claim 8, wherein the moving-object image creating unit comprises:

a background model creating unit for creating a background model;

a foreground image creating unit for creating a foreground image; and

a connecting unit for connecting the foreground image to form the moving-object image.

12. The image detecting system according to claim 8, wherein the edge-straight-line image creating unit creates the edge-straight-line image according to a gradient image of the original image.

13. The image detecting system according to claim 12, wherein the gradient image comprises a horizontal gradient value and a vertical gradient value.

14. The image detecting system according to claim 8, wherein the edge-straight-line image creating unit comprises:

an edge line image creating unit for creating an edge line image of the original image;

an edge angle image creating unit for creating an edge angle image of the original image; and

a cutting unit for cutting the edge line image and the edge angle image to form the edge-straight-line image.