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A Novel Adaptable Sonar Image Pseudo-color Enhancement Method Using CIELab Space

A novel adaptable sonar image pseudo-color enhancement method using CIELab space is introduced in this paper. This method gets the pseudo-color image through establishing a nonlinear mapping relationship between the gray sonar image and the pseudo-color image. Firstly, this method gets the color information of the pseudo-color image and the intensity information of gray sonar image through the transformation form RGB space to CIELab space. Secondly, put the color information and the intensity information together and inversely transform them from CIELab space to RGB space. Then the pseudo-color image is obtained. As well, three objective evaluation methods will be used to evaluate the novel method. The experimental results show that the pseudo-color image obtained using the novel method has more rich colors and clear details, and it is a good sonar image pseudo-color enhancement method.