关键词:
Image reconstruction
摘要:
Aiming at the problem that the effect of remote sensing image super-resolution reconstruction is fuzzy and the detail texture is lost in the reconstruction process, a remote sensing image super-resolution network model pDDPMSR suitable for multi-scale tasks is proposed. Firstly, an efficient pixel shift convolution module SCAM is constructed by combining shift convolution and serial multi-attention mechanism to expand the receptive field to enhance the extraction of local features, so as to improve the image clarity. At the same time, multi-attention is used to focus on the high-frequency information of the image in the channel and spatial dimensions to enhance the expression of contour detail information. Secondly, in order to prevent the loss of detailed texture, CA-ASPP is designed to fuse coordinate attention and multi-scale atrous convolutional pyramid network, so as to capture context information at different scales. Finally, the denoising diffusion probabilistic model (DDPM) is introduced to generate the high-resolution image. The layer skip sampling is used to accelerate the reasoning speed of DDPM. A nonlinear noise scheduling scheme is designed to solve the problem of excessive noise at the end of DDPM adding noise. Experimental results on the public dataset RSSCN7 show that the reconstruction effect of pDDPMSR is more significant than the comparison algorithms in peak signal-to-noise ratio (PSNR) and structural similarity (SSIM), and the method of layer skip sampling accelerates the inference process of diffusion model by 10 times. © 2024 Journal of Computer Engineering and Applications Beijing Co., Ltd.;Science Press. All rights reserved.