Method for resizing images using integer DCT coefficients

Details Method for resizing images using integer DCT coefficients Method for resizing images using integer DCT coefficients

2008-01-29

2011-11-29

Ahmed, Samir (Department: 2624)

Image analysis

Image compression or coding

Transform coding

C382S233000, C382S248000, C382S298000

Reexamination Certificate

active

08068685

ABSTRACT:
The present invention relates to a method of converting the size of an image, i.e., resolution of an image, and more specifically, to a method of reducing or enlarging the size of an image using coefficients of integer discrete cosine transform (Integer DCT), which is a type of block transform. Since the method of reducing and enlarging the size of an image according to the present invention reduces or enlarges the size of an image through an integer operation, hardware can be implemented using shifts and additions, and therefore, complexity of the hardware may be lowered, and the method of the present invention provides images of a good quality that is almost the same as the quality of an image provided according to a conventional method of reducing and enlarging an image using real-number DCT coefficients. The method of reducing and enlarging the size of an image according to the present invention is compatible with a H.264/AVC codec.

REFERENCES:
patent: 2004/0126021 (2004-07-01), Sull et al.

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