方法在分析已有栅格边长估算方法的基础上，提出基于有点区域的二次分割算法来估算最优边长。
Methods According to the analysis of estimating methods for edge length of grid, a new algorithm of estimating optimal edge length based on point area is presented using second division.
该算法以原始图像与分割后图像的相关系数最大为准则，选取最优阈值对磨粒图像进行二值化。
An optimum threshold is selected by maximizing the correlation between the original halftone image and the thresholded bi-level image.
最后，通过寻优搜索得到算法的输出值即为最优阈值，以此阈值划分像素，实现图像分割。
Finally, the output of this algorithm is the optimal threshold. Using this threshold to partition off the pixels, image segmentation is implemented.
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