Title:
APPARATUS AND METHOD FOR CALCULATING CUBIC CONVOLUTION USING TABLE-BASED TAP COEFFICIENTS
Document Type and Number:
WIPO Patent Application WO/2019/182230
Kind Code:
A1
Abstract:
To solve the problem of computing using complex multipliers from the viewpoint of hardware design, provided are a cubic convolution calculation device and an image scaler using same, in which the cubic convolution calculation device uses table-based tap coefficients that can calculate pixel values with low hardware complexity by tabulating tap coefficients so as to use only shift operators and adders. An image scaling method according to an embodiment of the present invention comprises the steps of: receiving an image; changing the resolution of the input image by performing a cubic convolution operation on pixel values of the input image; and outputting an image whose resolution is changed, in which tap coefficients of an expression for the cubic convolution operation may be tabulated. Due to these features, it is possible to interpolate pixel values for changing the image resolution with low hardware complexity through cubic convolution using table-based tap coefficients that use only shift operators and adders without complex multipliers.
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Inventors:
KIM BYUNG SOO (KR)
KIM DONG SUN (KR)
JANG YOUNG JONG (KR)
KIM DONG SUN (KR)
JANG YOUNG JONG (KR)
Application Number:
PCT/KR2018/016419
Publication Date:
September 26, 2019
Filing Date:
December 21, 2018
Export Citation:
Assignee:
KOREA ELECTRONICS TECHNOLOGY (KR)
International Classes:
G06T3/00; G06T5/20
Foreign References:
| KR20040065806A | 2004-07-23 | |||
| CN107197291A | 2017-09-22 |
Other References:
JUN, YOUNGHYUN ET AL.: "Liner Cubic Convolution Interpolation Algorithm with Low Complexity", PROCEEDINGS OF THE KIISE, June 2006 (2006-06-01), pages 395 - 397, XP55637588, Retrieved from the Internet
JUN, YOUNGHYUN ET AL.: "Implementation of a Modified Cubic Convolution Scaler for Low Computational Complexity", JOURNAL OF KOREA MULTIMEDIA SOCIETY, July 2007 (2007-07-01), pages 838 - 845, XP55637601, Retrieved from the Internet
SHI, JIAZHENG ET AL.: "Image interpolation by two-dimensional parametric cubic convolution", IEEE TRANSACTIONS ON IMAGE PROCESSING, vol. 15, no. 7, July 2006 (2006-07-01), pages 1857 - 1870, XP055055424, Retrieved from the Internet doi:10.1109/TIP.2006.873429
JUN, YOUNGHYUN ET AL.: "Implementation of a Modified Cubic Convolution Scaler for Low Computational Complexity", JOURNAL OF KOREA MULTIMEDIA SOCIETY, July 2007 (2007-07-01), pages 838 - 845, XP55637601, Retrieved from the Internet
SHI, JIAZHENG ET AL.: "Image interpolation by two-dimensional parametric cubic convolution", IEEE TRANSACTIONS ON IMAGE PROCESSING, vol. 15, no. 7, July 2006 (2006-07-01), pages 1857 - 1870, XP055055424, Retrieved from the Internet
Attorney, Agent or Firm:
NAM, Choong Woo (KR)
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