Considering the image contrast as a measurement of the degree of the image focus, a novel autofocus algorithm for Synthetic Aperture Radar (SAR) imagery is presented in this paper.

以对比度作为衡量图像聚焦程度的标准，研究了一种新颖的SAR图像自聚焦算法。

youdao

"IUS014F-Z" is an all-in-one imaging module type with a camera signal processing functions on the image sensor, with built-in auto-focus and image quality adjustment.

ENGADGET: Sony announces new Exmor RS cameraphone sensor: upgraded signal processing, HDR video recording

This allows you to instantly see a magnified portion of the image, which is helpful in knowing if a part of an image is in focus.

WSJ: The Digital Solution: Letting Your Fingers Do the Photo Editing

Tapping in on the chosen subject within the frame of the cameras' LCD monitor instantly focuses the subject and automatically triggers the shutter for instantaneous in-focus image capture thanks to the Touch AF Shutter function.

ENGADGET: Olympus E-PL5 and E-PM2: Micro Four Thirds cameras with OM-D-like focusing, performance boosts (hands-on)