A STUDY ON IMAGE COMPRESSION WITH NEURAL NETWORKS USING MODIFIED LEVENBERG METHOD

In this paper, an adaptive method for image compression that is subjective on neural networks based on complexity level of the image. The multilayer perceptron artificial neural network uses the different Back-Propagation artificial neural networks in processing of the image. The original images taken, for instance 256*256 pixels of bitmap image, each block of image into one network selection, according to each block the value of pixels in image complexity value is calculated. To estimate each value of the images in a block can be evaluated and trained. Best PSNR in selecting images to be compressed with a modification Levenberg-Marquart for MLP neural network is taken. The algorithm taken a good research of result to each block of image. The taken time reduces the learning procedure for running each block of images. Finally, a neural network taken for the Back Propagation artificial neural network

Image-based Relighting Using Implicit Neural Representation

Rendering a scene under novel lighting has been a problem in all fields that require computer graphics knowledge, and Image-based relighting is one of the best ways to reconstruct the scene correctly. Current research on Image-based relighting uses discrete convolutional neural networks, which tend to be less fit-able to different spatial resolutions and take up massive memory spaces. However, the implicit neural representation solves the problem by mapping the coordinates of the image directly to the value of the coordinate with a continuous function modeled through the neural network. In this way, despite the changing of the image resolution, the parameters taken in by the neural network stay the same, so the complexity stays the same. Also, the rectified linear activation unit (ReLU) based network used in current research lacks the representation of information of second and higher derivatives. On the other hand, the sinusoidal representation networks (SIREN) provide a new way to solve this problem by using periodic activation functions like the sin curve. Hence, my research intends to leverage implicit neural representation with periodic activation functions in image-based relighting. To tackle the research question, we proposed to base our image-relighting network on the SIREN network in the research by Sitzmann. Our method is to modify the SIREN network so that it takes in not only coordinates but also light positions. Then we train it with a set of input images depicting the same set of sparse objects in different lighting conditions and their corresponding light positions, as in previous image-based relighting research. We test our network by giving the network new lighting positions, and the result we aim for is to acquire a good representation of optimal sparse samples under novel lighting with high-frequency details. Eventually, we run the training and test with several different input sets and acquire their results. We also compare and evaluate the results, in order to find the advantage or limitation of the method

Learning Convolutional Neural Networks in the Frequency Domain

Convolutional neural network (CNN) has achieved impressive success in computer vision during the past few decades. The image convolution operation helps CNNs to get good performance on image-related tasks. However, the image convolution has high computation complexity and hard to be implemented. This paper proposes the CEMNet, which can be trained in the frequency domain. The most important motivation of this research is that we can use the straightforward element-wise multiplication operation to replace the image convolution in the frequency domain based on the Cross-Correlation Theorem, which obviously reduces the computation complexity. We further introduce a Weight Fixation mechanism to alleviate the problem of over-fitting, and analyze the working behavior of Batch Normalization, Leaky ReLU, and Dropout in the frequency domain to design their counterparts for CEMNet. Also, to deal with complex inputs brought by Discrete Fourier Transform, we design a two-branches network structure for CEMNet. Experimental results imply that CEMNet achieves good performance on MNIST and CIFAR-10 databases.Comment: Submitted to NeurIPS 202

Image Feature Extraction Based on Differential Evolution Neural Network

Abstract Image feature extraction result determines the analysis and understanding of the final image, and plays an important role in image engineering. Based on image feature extraction as the research object, this paper processes the image by using the good generalization ability, robustness and numerical approximation ability of the neural network to form the input data of BP neural network, then adopts the differential evolution (DE) algorithm to improve the BP neural network, which make it realize the faster convergence during the sample training, thus, the image feature extraction effect is increased and the time complexity is reduced, and in this way, the feature extraction result is guaranteed to not be distorted to the maximum. That the algorithm in this paper has better performance in the image feature extraction is testified by experimental simulation analysis and comparison

Novel CBIR System Based on Ripplet Transform Using Interactive Neuro-Fuzzy Technique

Content Based Image Retrieval (CBIR) system is an emerging research area in effective digital data management and retrieval paradigm. In this article, a novel CBIR system based on a new Multiscale Geometric Analysis (MGA)-tool, called Ripplet Transform Type-I (RT) is presented. To improve the retrieval result and to reduce the computational complexity, the proposed scheme utilizes a Neural Network (NN) based classifier for image pre-classification, similarity matching using Manhattan distance measure and relevance feedback mechanism (RFM) using fuzzy entropy based feature evaluation technique. Extensive experiments were carried out to evaluate the effectiveness of the proposed technique. The performance of the proposed CBIR system is evaluated using a 2 £ 5-fold cross validation followed by a statistical analysis. The experimental results suggest that the proposed system based on RT, performs better than many existing CBIR schemes based on other transforms, and the difference is statistically significant