Method and apparatus for resizing images using the discrete cosi

Details Method and apparatus for resizing images using the discrete cosi Method and apparatus for resizing images using the discrete cosi

1996-10-10

1998-12-01

Au, Amelia

Image analysis

Image compression or coding

Transform coding

382298, 382235, 382264, G06T 900

Patent

active

058450157

ABSTRACT:
A method and apparatus using the discrete cosine transform (DCT) to resize an image. To reduce an image, the method and apparatus exploits the convolution-multiplication property of the DCT to implement the anti-aliasing filter in the DCT domain, then the filtered coefficients are operated on to produce DCT coefficients of the reduced-size image. To increase an image, the DCT coefficients of the original image are operated on to produce coefficients of the larger image, then the convolution-multiplication property of the DCT is used to implement an anti-imaging filter. These DCT operations can be applied to the image as a whole or can be applied to non-overlapping blocks of the image.

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Stephen A. Martucci, "Symmetric Convolution and the Discrete Sine and Cosine Transforms", IEEE Transactions on Signal Processing, vol. 42, No. 5, May 1994.
Stephen A. Martucci, Russell M. Mersereau, "New Approaches to Block Filtering of IImages Using Symmetric Convolution and the DST or DCT", International Symposium on Circuits and Systems (ISCAS) Conference 1993.
Stephen A. Martucci, "Digital Filtering of Images Using the Discrete Sine or Cosine Transform", Visual Communications and Image Processing'94, Sep. 25-29, Chicago, Illinois, vol. 2308.

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