METHOD AND APPARATUS FOR ENCODING AND DECODING VIDEO IMAGES
First Claim
1. A method of encoding an image comprising:
- dividing a current image frame into a background area and an object area;
comparing the current image frame with a previous image frame, thereby determining whether a background area or an object area has changed between the current image frame and the previous image frame;
according to the result of the determination, updating a reference background image which is generated from backgrounds of previous image frames, by using the background area of the current image frame, and storing the updated reference background image; and
performing motion estimation of an image frame subsequent to the current image frame by using the updated reference background image.
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Accused Products
Abstract
A method of and apparatus for encoding and/or decoding an image are provided, in which motion estimation and compensation are performed by using a reference background image and a reference object image extracted from an input image frame. In the method and apparatus, a background image of each of input image frames is used, and a background area which any one image frame lacks is updated by using a background image of another image frame. In this way, a reference background image is generated and stored, and an object image in each image frame is stored as a reference object image. Then, by using the stored reference background images and reference object images, motion estimation and compensation are performed, thereby increasing encoding efficiency.
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Citations
25 Claims
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1. A method of encoding an image comprising:
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dividing a current image frame into a background area and an object area; comparing the current image frame with a previous image frame, thereby determining whether a background area or an object area has changed between the current image frame and the previous image frame; according to the result of the determination, updating a reference background image which is generated from backgrounds of previous image frames, by using the background area of the current image frame, and storing the updated reference background image; and performing motion estimation of an image frame subsequent to the current image frame by using the updated reference background image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An apparatus for encoding an image comprising:
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an area separation unit which divides a current image frame into a background area and an object area; a determination unit which compares the current image frame with a previous image frame, thereby determining whether a background area or an object area changes between the current image frame and the previous image frame; an update unit which updates a reference background image which is generated from backgrounds of previous image frames, by using the background area of the current image frame, according to the result of the determination, and storing the updated reference background image; and a motion estimation unit which performs motion estimation of an image frame subsequent to the current image frame, by using the updated reference background image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method of decoding an image comprising:
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separating a background area and an object area from each of at least two image frames, including a first image frame and a second image frame, restored before a current image frame is decoded; comparing the restored first image frame and second image frame, and determining whether or not a background area or an object area changes between the first image frame and the second image frame; according to the result of the determination, updating a reference background image which is generated from background areas of previously restored image frames, by using the backgrounds of the first image frame and the second image frame, and storing the updated reference background image; and by using the updated reference background image, performing motion compensation of the current image frame. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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22. An apparatus for decoding an image comprising:
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an area separation unit which separates a background area and an object area from each of at least two image frames, including a first image frame and a second image frame, restored before a current image frame is decoded; a determination unit which compares the restored first image frame and second image frame, and which determines whether or not a background area or an object area changes between the first image frame and the second image frame; an update unit which updates a reference background image which is generated from background areas of previously restored image frames, by using backgrounds of the first image frame and the second image frame, according to the result of the determination; a storage unit which stores the updated reference background image; and a motion compensation unit which performs motion compensation of the current image frame, by using the updated reference background image. - View Dependent Claims (23, 24, 25)
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Specification