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传统光学数字图像自动聚焦系统存在稳定性和聚焦响应实时性差等问题,在低照度噪声环境下,容易出现对焦的偏差,提出传感器的光学数字图像自动聚焦系统,首先依据光学自动聚焦的原理来设计图像自动聚焦的硬件系统和软件流程;然后采用黄金分割法选择聚焦的区域,利用拉普拉多算子对离焦光学数字图像进行二阶微分,并获取微分图像的自相关;最后求解自相关离焦图像的弥散斑半径,根据离焦量与弥散斑半径的光学几何关系,实现光学数字图像的自动聚焦。实验证明提出的系统设计具有灵敏度高、可靠性强的优点,在低照度的条件下,仍可以获取比较清晰的图像。
The traditional optical digital image autofocus system has the problems of poor stability and poor focusing response timeliness. In the environment of low illumination and noise, the deviation of autofocus tends to occur. The optical digital image autofocusing system of sensor is proposed, which is based on the principle of optical autofocus Then the golden section method is used to select the focused area, the second order differential of the defocused optical digital image is obtained by using the Laplacian operator, and the autocorrelation of the differential image is obtained. Finally, the auto-correlation defocus According to the optical geometric relationship between the defocus amount and the radius of the speckle, the optical digital image is automatically focused. Experiments show that the proposed system design has the advantages of high sensitivity and strong reliability. Under low illumination conditions, it is still possible to obtain a clearer image.