Processing image data

• US 5,786,824 A
• Filed: 04/10/1996
• Issued: 07/28/1998
• Est. Priority Date: 04/09/1996
• Status: Expired due to Term

• Current Assignee: Autodesk, Inc.
• Original Assignee: Discreet Logic, Inc. (Autodesk, Inc.)
• Inventors: Sevigny, Benoit
• Primary Examiner(s): Nguyen, Phu K.
• Application Number:
  US08/630,131
• Time in Patent Office: 839 Days
• Field of Search: 395/138, 395/135, 345/435, 345/438, 345/113, 345/114, 345/118, 345/121
• US Class Current: 345/672
• CPC Class Codes: G06T 7/254 involving subtraction of images
• CPC Class Codes: H04N 23/68 for stable pick-up of the scene, e.g. compensating for camera body vibrations
• CPC Class Codes: H04N 23/6811 based on the image signal
• CPC Class Codes: H04N 23/682 Vibration or motion blur correction
• CPC Class Codes: H04N 5/262 Studio circuits, e.g. for mixing, switching-over, change of character of image, other special effects ; Cameras specially adapted for the electronic generation of special effects

Abstract

The present invention relates to a method and apparatus for removing unwanted movements in digitized image caused by unsuitable camera mountings or recordings made under difficult conditions. The image data is processed by tracking a selected image portion over a plurality of frames. The position of the image within its frame is adjusted so that the position of the selected image portion remains substantially constant frame after frame, and modifications to the image are made. Portions of the images that extend beyond frame edges are repositioned within the frame edge. The position of the image within its frame is then reset to its original position, so that the modified image moves as if it were part of an original shot.

Claims

1. A method of processing image data, wherein a plurality of recorded and digitized images are replayable as a video clip, comprising the steps of:

selecting an image portion in an image frame;

tracking said selected image portion over a plurality of frames;

adjusting the position of the selected image within a frame boundary for each image frame so as to maintain the position of said selected portion substantially constant within its image frame;

repositioning portions of said image which extend beyond a frame edge to positions within its image frame;

defining a modification to a portion of an image frame;

repeating said modification over a plurality of frames; and

readjusting the position of said image within the image frame.

2. A method according to claim 1, wherein said re-positioned portions are re-positioned adjacent to an opposing edge of said image frame.

3. A method according to any of claims 1 and 2, wherein said digitized images are replayed from magnetic disk storage.

4. A method according to claim 1, wherein an inner block of pixels are positioned within an outer block, pixel comparisons are made and match factors are compared to calculate a movement vector for the inner block.

5. Apparatus for processing image data, including means for replaying a plurality of digitized images as an image clip, comprising:

selecting means for selecting an image portion in an image frame;

tracking means for tracking said selected image portion over a plurality of frames;

adjusting means for adjusting the position of the selected image within a frame boundary so as to maintain the position of said selected portion substantially constant within said frame;

repositioning means for repositioning portions of said image which extend beyond a frame edge to positions within the image frame;

defining means for defining a modification to a portion of an image frame;

processing means for repeating said modification over a plurality of frames; and

readjusting means for readjusting the position of said image within the image frame.

6. An apparatus for processing image data according to claim 5, wherein said repositioning means reposition said portions of said image adjacent to an opposing edge.

7. An apparatus for processing image data according to claim 5, wherein said replaying means include magnetic disk storage means.

8. An apparatus for processing image data according to claim 5, wherein said adjusting means include:

means for selecting an inner block of pixels, positioned within an outer block of pixels;

means for comparing pixels and for comparing match factors; and

means for calculating a movement vector for said inner block.