发明名称 |
METHOD FOR TRANSFORMING SIZE OF IMAGE AT BLOCK DISCRETE COSINE TRANSFORM DOMAIN |
摘要 |
PURPOSE: A method for transforming the size of an image at a block discrete cosine transform domain is provided to randomly transform the size of the image and remarkably reduce the amount of calculation by simplifying window functions. CONSTITUTION: In the case of downsampling, 8xM samples are made by inserting M-1 zeros in the back of each sample of a DCT(Discrete Cosine Transform) block formed of 8 samples. The adjacent 8xM samples are symmetrically convoluted with DCT coefficients of M window functions. Upper 8 samples of the M results of the symmetrical convolution are added with each other to make 8-sample DCT. In the case of upsampling, 8xL samples are made by inserting (L-1)x8 zeros after each sample of a DCT block formed of 8 samples. 8xL samples are symmetrically convoluted with DCT coefficients of L window functions. Every L sample is collected from the 8xL sample result value of the symmetrical convolution to make L 8-sample DCT block. |
申请公布号 |
KR20030053108(A) |
申请公布日期 |
2003.06.28 |
申请号 |
KR20010083146 |
申请日期 |
2001.12.22 |
申请人 |
KOREA ADVANCED INSTITUTE OF SCIENCE AND TECHNOLOGY;ONTIMETEK INC. |
发明人 |
OH, SEUNG GYUN;PARK, HYEON UK;PARK, YEONG SEO |
分类号 |
G06T9/00;H04N7/26;H04N7/30;H04N7/46;(IPC1-7):H04N7/30 |
主分类号 |
G06T9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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