The existence of noise will seriously affect quality of image. Image denoising method is important for obtaining high-quality image. Most of traditional denoising methods need to estimate the noise level, which are unstable in the actual denoising scene. As a data-driven method, the development of deep learning shows great potential in the field of image denoising. In this paper, a method combining image denoising model and deep learning framework is proposed. Welldesigned multi-scale restoration network Noise-Net embedded this method optimizing neural network training to obtain ideal image recovery results. By down-sampling the original noisy image input at different scales, the noisy image features are extracted. These multi-scale features are summed and combined. The addition of the residual module improves the network training ability and effectively prevents the network from overfitting. The network is optimized by Convolutional Block Attention Module (CBAM). It can enable effective extraction of image features in the spatial and frequency domains. Network input is noisy image, clear image as label. The training phase is divided into two stages: noisy data generation and simulated images for pre-training. 2000 images of DOTA 1.0 dataset constitute as training set and 1000 images as test set. By adding different noises such as Gaussian noise and Poisson noise to the image, the data set is constructed with the label image. The loss function of the absolute minimum error is calculated and sent to the Adam optimizer for parameter optimization. Numerical simulation and experimental results show that Noise-Net has an effect on image denoising ability.
In recent years, the field of image super-resolution has mainly focused on the single-image super-resolution (SISR) task, which is to estimate an HR image from a single LR input. Due to the ill-posed ness of the SISR problem, these methods are limited to increasing the high-frequency details of the image by learning the a priori of the image. And multi-frame super-resolution (MFSR) provides the possibility to reconstruct rich details using the spatial and temporal difference information between images. With the increasing popularity of array camera technology, this key advantage makes MFSR an important issue for practical applications. We propose a new structure to complete the task of multi-frame image super-resolution. Our network takes multiple noisy images as input and generates a denoised, super-resolution RGB image as output. First, we align the multi-frame images by estimating the dense pixel optical flow between the images, and construct an adaptive fusion module to fuse the information of all frames. Then we build a feature fusion network to simultaneously fuse the depth feature information of multiple LR images and the internal features of the initial high-resolution image. In order to evaluate real-world data, We use the BurstSR data set, which includes real images of smartphones and highresolution SLR cameras, to prove the effectiveness of the proposed multiframe image super-resolution algorithm.
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