A new smalltarget detection method under sea surface environment is presented.Because the frequency tuned saliency detection is based on differences of the mean values of image features and the result of Gaussian filtering

the performance is not satisfying when there are many clutters in the background.The proposed approach makes improvement to frequency tuned saliency detection.The three components of image in LAB color space are divided into patches and within each patch

the frequency tuned saliency detection is conducted.The master saliency map is the fusion of each patch’s saliency map.The proposed method overcomes the limitation of frequency tuned saliency detection when there are many clutters under sea background.The effectiveness of it is demonstrated by experiments.