The circular sampling FRIT is first used in the sonar image denoising technique, and makes high improvement to heighten the Signal Noise Ratio.

• 将FRIT处理技术应用在水下声纳图像去噪技术中，基于该方法提出循环抽样FRIT去噪算法，提高了处理结果的信噪比及边缘保持效果。