转换成手动对焦，确保你的焦距对准画面中视觉感强的地方。
Switch to manual focus and make sure your focus is upon a part of your image that is visually strong.
从光学测量角度出发，结合计算机视觉中的摄像机标定方法，解决了大视场短焦距镜头CCD摄像系统的畸变校正问题。
According to the principle of optical measurement, a simple and effective method to measure the distortion of CCD camera with a largefield, short focal length lens is presented.
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