| 摘要 |
An auto focus Image system that Includes a pixel array coupled to a focus signal generator. The pixel array capturesan Image that has at least one edge with a width. The focus5 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 widthcan be determined by various techniques including the use of10 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 afocused Image. The generator may eliminate an edge having an asymmetry of a gradient profile of an Image signal.15 |
