高清晰度电视的基本概念实际上并不是提高每个单元域的清晰度，而更多是提高图像中包括的可视域的百分比。
The basic concept behind high-definition television is actually not to increase the definition per unit area… but rather to increase the percentage of the visual field contained by the image.
该算法定义了图像区域的相对清晰度判定指标，并根据多焦距图像像素邻域的相对清晰度来逐个选取聚焦清晰的像素点从而构成融合图像。
To overcome this problem, a novel fusion algorithm is proposed, which is based on a new image region focus measure, Relative Activity Level (RAL), presented in this paper.
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