There is serious coherent speckle noise in the synthetic aperture radar (SAR) image. Several gradient operators' performance was studied without speckle reducing in SAR image, included the Canny, Ratio operator and instantaneous coefficient of variation (ICOV). We mainly studied the performance of the above operators on edge detection capability and positioning accuracy for SAR image. Simulation test of one-dimensional synthesis signal showed that only ICOV can get the optimal single-value width response. In order to further validation, synthetic image and real SAR image would also be respectively applied in segmentation experiments. According to the segmentation results, it can be easily known that the segmentation results based on ICOV operator always get the fastest efficiency and the highest accuracy.
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