Abstract: The Laplacian of Gaussian operator rapid localization and the principle of subpixel edge operator based on two-dimensional spatial moment are presented at first. A three gray levels edge model based on spatial moment is given which is closed to practical image sampling. The error formula is deduced. Finally, the experiment is carried out. The validity and precision of subpixel edge spatial moment operator is studied and the subpixel edge detection results are compared to practical size. The results indicate that the subpixel edge detection operator based on spatial moment is much better than traditional edge detection operator.

Key words: Laplacian of gaussian operator, Spatial moment operator, Subpixel edge localization