Method and apparatus for transforming and inverse-transforming image
AssigneeSamsung Electronics Co., Ltd.
InventorsSo-young KIM, Woo-jin Han
Life of this patent
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Abstract
Provided are a method and apparatus for transforming an image, in which an input image is transformed into a frequency domain by selectively using a plurality of frequency transform algorithms according to a frequency characteristic of the input image. The method includes: selecting a frequency transform algorithm to be used for a current block from a plurality of frequency transform algorithms according to a result obtained by transforming frequencies of peripheral blocks adjacent to the current block; and transforming the current block into a frequency domain by using the selected frequency transform algorithm.
Claims8
A method of transforming an image, the method comprising:
- obtaining a result of frequency transforming of peripheral blocks adjacent to a current block;
- selecting a frequency transform algorithm to be used for the current block from a plurality of frequency transform algorithms based on the obtained result of frequency transforming of peripheral blocks;
- and
- transforming the current block into a frequency domain by using the selected frequency transform algorithm.
A method of inverse-transforming an image, the method comprising:
- extracting a frequency transform coefficient by entropy-decoding a coded bit-stream;
- selecting a frequency transform algorithm used to transform the extracted frequency transform coefficient from a plurality of frequency transform algorithms based on a result obtained by transforming frequencies of peripheral blocks adjacent to a current block;
- inverse-transforming the frequency transform coefficient by using the selected frequency transform algorithm.
Dependencies are inferred from the claim text.