研究了光学防抖提高相机成像清晰度的原理和效果.从相机成像光路上分析了抖动对成像的影响并给出抖动造成的偏移量的表达式；建立了光学防抖的控制模型,采用PID控制算法,利用MATLAB仿真得出防抖效果；在关闭和开启光学防抖条件下,对成像目标拍摄并经处理后得到2组8幅150×112像素的图像.在基于频率域的直方图上,有光学防抖的图像增加10个左右高频分量；在基于空间域的能量梯度曲线上,有光学防抖的图像数量级从104提高到了105.%The principle and effect of image stabilizer for improving the definition of image are studied. First, the influence of shaking on imaging is analyzed according to the light path of camera and the expression of offset d caused by shaking is given; second, the paper establishes the control model of the image stabilizer, uses the proportional-integral-derivative (PID) con-, trol algorithm and gets the result of anti-shaking effects with the simulation of MATLAB; last, some objects are shot by a digital camera respectively under the conditions of opening and closing image stabilizer. Two groups, 8 images of 150X112 pixels are obtained. Based on the histogram in frequency domain, the image shot with image stabilizer has 10 more high-frequency components than the image shot without image stabilizer on average; based on the energy gradient curve in spatial domain, the order of magnitude of the image shot with image stabilizer increases from 104 to 105.
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