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method for generating a focus signal from a plurality of edges of an image, computer readable medium, fire signal generating circuit and image capture system
method for generating a focus signal from a plurality of edges of an image, computer readable medium, fire signal generating circuit and image capture system
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机译:从图像的多个边缘产生聚焦信号的方法,计算机可读介质,火灾信号产生电路和图像捕获系统
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摘要
An auto focus image system that includes a pixel array coupled to a focus signal generator. The pixel array captures an image that has at least one edge with a width. The focus signal generator may generate a focus signal that is a function of the edge width and/or statistics of edge widths. A processor receives the focus signal and/or the statistics of edge widths and adjusts a focus position of a focus lens. The edge width can be determined by various techniques including the use of gradients. A histogram of edge widths may be used to determine whether a particular image is focused or unfocused. A histogram with a large population of thin edge widths is indicative of a focused image. The generator may eliminate an edge having an asymmetry of a gradient profile of an image signal.
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