Therefore, it is very necessary and important to use a good denoising algorithm for image denoising. The image polluted by noise will have a great adverse effect on the subsequent image processing, mainly including image segmentation, extraction, detection, and recognition. In the process of transmission, the image polluted by noise will affect people’s visual sense to varying degrees, sometimes even leading to the loss of many image features, making the image blurred, affecting the useful information of the image, and thus hindering people’s normal recognition. The noise image is mainly caused by the imperfect system and equipment. The PSNR of the new algorithm is greatly improved compared with the classical algorithm, which can effectively suppress the noise and protect the image edge and detail information. ![]() ![]() Moreover, it has better PSNR than other excellent denoising algorithms at different noise standard deviations. From the comparison results, it can be seen that the improved denoising algorithm in this paper can also improve the detail restoration of denoised images without losing the sharpness. Finally, the algorithm is compared with other excellent denoising algorithms. Combined with batch standardization and residual learning technology, the image denoising network model based on deep residual learning of the convolutional network is designed with better denoising performance. The training speed of the model is accelerated and the convergence of the algorithm is improved. A neural network is used to realize image denoising because of its good learning ability of image statistical characteristics, mainly by the diffusion equation and deep learning (CNN) algorithm as the foundation, focus on the effects of activation function of network optimization, using multiple feature extraction technology in-depth networks to study the characteristics of the input image richer, and how to better use the adaptive algorithm on the depth of diffusion equation and optimization backpropagation learning. Then, the threshold function is adaptively designed and improved so that it can automatically control the threshold of the function according to the maximum gray value of the image and the number of iterations, so as to further preserve the important details of the image such as edge and texture. Firstly, the diffusion coefficient in the diffusion equation is improved, and the fitting diffusion coefficient is established to overcome the defects of texture detail loss and edge degradation caused by excessive diffusion intensity. An adaptive threshold image denoising algorithm based on fitting diffusion is proposed. Effective noise removal has become a hot topic in image denoising research while preserving important details of an image.
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