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    • 3. 发明授权
    • Systems and methods for arriving at an auto focus Figure of Merit
    • 达到自动对焦的系统和方法优点图
    • US07343047B2
    • 2008-03-11
    • US10946771
    • 2004-09-22
    • Eric F. AasGregory V. HoferCasey L. Miller
    • Eric F. AasGregory V. HoferCasey L. Miller
    • G06K9/40H04N5/232
    • H04N5/23212G02B7/36
    • A method comprises detecting edges in at least a region of a captured focus image, using adjacent pixels of the region to obtain first edge detection results and filtering the first edge detection results. The first filtering comprises comparing differences in pixel contrast in the first edge detection results with a first threshold value and removing the differences in pixel contrast that are less than the first threshold value from the first edge detection results. The method further comprises detecting edges in at least the region, using non-adjacent pixels of the region to obtain second edge detection results and filtering the second edge detection results. The second filtering comprising comparing differences in pixel contrast in the second edge detection results with a second threshold value and removing the differences in pixel contrast that are less than the second threshold value from the second edge detection results.
    • 一种方法包括使用所述区域的相邻像素来检测所捕获的聚焦图像的至少一个区域中的边缘,以获得第一边缘检测结果并对第一边缘检测结果进行滤波。 第一滤波包括将第一边缘检测结果中的像素对比度的差异与第一阈值进行比较,并且从第一边缘检测结果去除小于第一阈值的像素对比度的差异。 该方法还包括使用该区域的不相邻像素来检测至少该区域中的边缘,以获得第二边缘检测结果并对第二边缘检测结果进行滤波。 第二滤波包括将第二边缘检测结果中的像素对比度的差异与第二阈值进行比较,并且从第二边缘检测结果去除小于第二阈值的像素对比度的差异。