The urinary sediment image is captured by microscope, the depth-of-field of which is relatively low, consequently it is easy to lose focus and get blurred image.

• 尿沉渣图像属于显微成像的范畴,其景深较浅,由于机械误差,显微镜很容易失焦,对此我们给出了基于图像高频分量的自动聚焦算法,在每一个样本采集之前首先进行自动聚焦,保证了采集图像的清晰。