Method for Handling Static Text and Logos in Stabilized Images

• US 20090214078A1
• Filed: 02/26/2008
• Published: 08/27/2009
• Est. Priority Date: 02/26/2008
• Status: Active Grant

• Current Assignee: Cyberlink Corporation
• Original Assignee: Cyberlink Corporation
• Inventors: Kuo, Chia-Chen
• Granted Patent: US 8,121,409 B2
• Time in Patent Office: Days
• US Class Current: 382/103
• CPC Class Codes: H04N 21/44008 involving operations for analysing video streams, e.g. detecting features or characteristics in the video stream arrangements characterised by components specially adapted for monitoring, identification or recognition of video in broadcast systems H04H60/59
• CPC Class Codes: H04N 21/4882 for displaying messages, e.g. warnings, reminders arrangements for providing short real-time information to substation in data switching networks H04L12/1895
• CPC Class Codes: H04N 5/44504 Circuit details of the additional information generator, e.g. details of the character or graphics signal generator, overlay mixing circuits

Abstract

To handle static text and logos in stabilized images without destabilizing the static text and logos, a method of handling overlay subpictures in stabilized images includes detecting an overlay subpicture in an input image, separating the overlay subpicture from the input image, stabilizing the input image to form a stabilized image, and merging the overlay subpicture with the stabilized image to obtain an output image.

Claims

1. A method of handling overlay subpictures in stabilized images comprising:

detecting an overlay subpicture in an input image;

stabilizing the input image to form a stabilized image; and

merging the overlay subpicture with the stabilized image to obtain an output image.

2. The method of claim 1, further comprising:

utilizing the input image and a plurality of images to determine a static region of the input image corresponding to the overlay subpicture.

3. The method of claim 2, wherein determining the static region is determining a region with matching size common to the input image and the plurality of images.

4. The method of claim 2, wherein determining the static region is determining a region with matching shape common to the input image and the plurality of images.

5. The method of claim 2, wherein determining the static region is determining a region with matching position common to the input image and the plurality of images.

6. The method of claim 2, wherein determining the static region of the input image corresponding to the overlay subpicture comprises:

utilizing the input image and the plurality of images to calculate a motion vector matching a predetermined criterion.

7. The method of claim 2, wherein determining the static region of the input image corresponding to the overlay subpicture comprises:

utilizing the input image and the plurality of images to calculate a luminance variation matching a predetermined criterion.

8. The method of claim 2, wherein determining the static region of the input image corresponding to the overlay subpicture comprises:

utilizing the input image and the plurality of images to calculate a chrominance variation matching a predetermined criterion.

9. The method of claim 1, wherein merging the overlay subpicture with the stabilized image to obtain the output image comprises:

processing a region the overlay subpicture is located in; and

setting the overlay subpicture separated from the input image on the stabilized image.

10. The method of claim 9, wherein processing the region the overlay subpicture is located in comprises:

replacing the region the overlay subpicture is located in with image data from a second region of the stabilized image.

11. The method of claim 9, wherein processing the region the overlay subpicture is located in comprises:

replacing the region the overlay subpicture is located in with image data from a second region of at least one image of the plurality of images.

12. The method of claim 9, wherein merging the overlay subpicture with the stabilized image to obtain the output image further comprises:

smoothing a border region of the overlay subpicture and the stabilized image.

13. The method of claim 1, wherein detecting the overlay subpicture comprises detecting subtitles.

14. The method of claim 1, wherein detecting the overlay subpicture comprises detecting a logo.

15. The method of claim 1, wherein detecting the overlay subpicture comprises detecting a timer.

16. The method of claim 1, further comprising:

separating the overlay subpicture from the input image.

17. The method of claim 16, wherein separating the overlay subpicture comprises:

recording a location of the overlay subpicture;

generating a copy of the overlay subpicture; and

removing the overlay subpicture from the input image.

18. The method of claim 17, wherein merging the overlay subpicture comprises:

laying the copy over the stabilized image at the location.

19. The method of claim 1, wherein merging the overlay subpicture with the stabilized image to obtain the output image comprises:

laying the overlay subpicture over the stabilized image.

20. The method of claim 1, wherein merging the overlay subpicture with the stabilized image to obtain the output image comprises:

masking the input image except the overplay subpicture; and

laying the stabilized image over the masked input image.