Iced Power Line Image Enhancement Method Based on Improved Retinex-Homomorphic Filter

In order to address issues related to complex backgrounds and poor contrast of transmission line icing image, a line icing image enhancement method is proposed in this paper, which based on improved Retinex-homomorphic filtering. To begin with, to address the issues of uneven brightness and unsatisfactory enhancement effect of traditional homomorphic filtering algorithm, a new filtering function is constructed as the filtering function of improved homomorphic filtering, and the image's high-frequency and low-frequency components are individually processed using the filtering function. Then, to address the edge blurring problem of the traditional Retinex algorithm, the Laplace operator is used to sharpen the edge of the image, and the sharpened image is used as the guided image of the guided filter, and then the guided filter is applied to replace the Gaussian low-pass filter in the conventional Retinex algorithm. Finally, the improved homomorphic filtering and the improved Retinex processing results are fused to obtain the final enhanced image. Experimental results indicate that, in comparison to the traditional algorithm, the enhanced algorithm can significantly improve the line icing image, and is superior to the traditional algorithm in terms of objective evaluation index and subjective visual effect.