Image Interpolation with Corner Preserving Based on Partial Differential Equation
Xiao Zhi-tao① Feng Tie-jun① Zhang Fang① Geng Lei① Wu Jun① Li Yue-long② Wang Dan-yu① Chen Ying①
①(School of Electronics and Information Engineering, Tianjin Polytechnic University, Tianjin 300387, China) ②(School of Computer Science and Software Engineering, Tianjin Polytechnic University, Tianjin 300387, China)
Image interpolation is a basic issue in digital image processing, which can be used to realize image magnification and restoration, etc.. Traditional interpolation methods are easy to make the edge structures produce staircase artifacts or make the interpolated results blurred. An image interpolation method with corner preserving based on Partial Differential Equation (PDE) is proposed, which provides different interpolation applications for different characteristics of the image. The proposed interpolation scheme is not only able to?maintain the edge structure clear, but also able to keep the corner sharp. Then, the overall visual and the Peak Signal to Noise Ratio (PSNR) of the interpolation image can be improved effectively. In addition, this paper puts forward methods for selecting the parameters through analyzing the equation, thus it improves the adaptability of the proposed method.
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