Virtual Magnifier-Based Image Resolution Enhancement

Virtual Magnifier-Based Image Resolution Enhancement

Lung-Chun Chang (Ching Yun University, Taiwan), Yueh-Jyun Lee (Ching Yun University, Taiwan), Hui-Yun Hu (Ching Yun University, Taiwan), Yu-Ching Hsu (Ching Yun University, Taiwan) and Yi-Syuan Wu (Ching Yun University, Taiwan)
Copyright: © 2013 |Pages: 8
DOI: 10.4018/978-1-4666-2928-8.ch006


To obtain high resolution images, some low resolution images must be processed and enhanced. In the literature, the mapping from the low resolution image to the high resolution image is a linear system and it is only enlarged by an integer scale. This paper presents a real scaling algorithm for image resolution enhancement. Using a virtual magnifier, an image resolution can be enhanced by a real scale number. Experimental results demonstrate that the proposed algorithm has a high quality for the enlarged image in the human visual system.
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Imaging Model

In the optics, the trace of a ray of light is a straight line. When the ray passes through a medium, the rule of the refraction is followed by the Snell's Law (Jenkins & White, 1976; Meyer-Arendt, 1989; Pedrotti & Pedrotti, 1987) and the Snell's Law is defined below.

Law of Refraction (Snell's Law) (Pedrotti & Pedrotti, 1987): When a ray of light is refracted at an in and denote the incident angle and the refraction angle, respectively, and denote the two media with refractive indices. Figure 1 shows a ray of light passing from medium into a optically denser medium where N is a normal line. According to the Snell's Law, an object M with height h is located at the left side of the lens and passes through the lens, then the imaging object with height is formed on the right side of the lens (see Figure 2). In Figure 2, and denote the left spherical surface and the right spherical surface of the lens, respectively.

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