Interpolation method for enlarging an image

Image analysis – Image transformation or preprocessing – Changing the image coordinates

Reexamination Certificate

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C345S660000

Reexamination Certificate

active

07606443

ABSTRACT:
The present invention relates to an interpolation method for enlarging an image, wherein the image is composed of plural scanning lines. Firstly, it selects four adjacent continuous pixels xk−1, xk, xk+1, and xk+2which have the pixel values f(xk−1), f(xk), f(xk+1), and f(xk+2) respectively on each of the scanning lines; next, it determines three linear equations Lk−1, Lk, and Lk+1according to every two adjacent pixel values f(xk−1) and f(xk), f(xk) and f(xk+1), and f(xk+1) and f(xk+2), respectively; then, it selects a pixel x to be interpolated between the pixel xkand the pixel xk+1; finally, it applies the pixel x to the three linear equations Lk−1, Lk, and Lk+1to determine three candidate pixel values which are weighted and combined to obtain pixel value f(x) of the pixel x.

REFERENCES:
patent: 5089893 (1992-02-01), Iwase
patent: 5740089 (1998-04-01), Menkhoff et al.
patent: 6961479 (2005-11-01), Takarada
Fang Xu, Hong Liu, Ge Wang, Bennett A. Alford, Comparison of Adaptive Linear Interpolation and Conventional Linear Interpolation for Digital Radiography Systems, Jan. 2000, Journal of Electronic Imaging, vol. 9 Issue 1, pp. 22-31.
K.T. Gribbon and D.G. Bailey “A Novel Approach to Real-Time Bilinear Interpolation” Proceedings of the Second IEEE Internationla Workshop on Electronic Design, Test and Applications (DELTA '04), Jan. 28-30, 2004, pp. 126-131.

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