Title:
【発明の名称】離散コサイン変換を用いて画像をリサイズする方法および装置
Document Type and Number:
Japanese Patent JP3266273
Kind Code:
B2
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.
Inventors:
Martuchi, Stephan, A.
Application Number:
JP51513697A
Publication Date:
March 18, 2002
Filing Date:
October 15, 1996
Export Citation:
Assignee:
Sarnoff Corporation
International Classes:
G06T3/40; G06T9/00; H04N1/393; H04N1/41; H04N5/262; H04N7/26; H04N7/30; H04N7/36; H04N7/46; (IPC1-7): H04N1/393; H04N1/41; H04N7/30
Other References:
【文献】米国特許5168375(US,A)
【文献】Ram Prabhakar,Cirrus Logic,DCT Scaling enables universal MPEG decoder,EDN,米国,1996年 6月 6日,page 147 - 148
【文献】Stephen A.Martucci,New approaches to block filtering of images using symmetric convolution and the DST or DCT,Internationsl Symposium on Circuits and Systems Conference(ISACS)
【文献】貴家仁志,松村正吾,マルチメディア技術の基礎DCT入門,日本,page 30,62,64
【文献】Ram Prabhakar,Cirrus Logic,DCT Scaling enables universal MPEG decoder,EDN,米国,1996年 6月 6日,page 147 - 148
【文献】Stephen A.Martucci,New approaches to block filtering of images using symmetric convolution and the DST or DCT,Internationsl Symposium on Circuits and Systems Conference(ISACS)
【文献】貴家仁志,松村正吾,マルチメディア技術の基礎DCT入門,日本,page 30,62,64
Attorney, Agent or Firm:
Yoshiki Hasegawa (5 others)