基于极限学习机的图像压缩算法

Image Compression Algorithm Based on Extreme Learning Machine

神经网络具有并行分布处理、自学习、自适应和很强的鲁棒性及容错性等优点,已被广泛应用于图像压缩领域,为图像压缩提供了一个新途径。极限学习机是一种单隐层前向神经网络算法,与传统神经网络算法相比,具有学习速度快、泛化能力强等优点。文中旨在提出一种基于极限学习机的图像压缩算法。该算法主要利用极限学习机的非线性映射能力,对图像进行压缩编码和解码。首先利用极限学习机通过学习构建一个用于图像压缩的单隐层前向神经网络模型,其次利用该模型实现图像压缩和图像重建。实验结果表明,在相同压缩比下,所提算法的重建效果优于BP神经网络,并且具有较快的学习速度。

With the advantages of parallel distributed processing,self-learning,self-adaption and strong robustness and fault tolerance, neural networks have been widely used in image compression,which provide a new approach to image compression. Extreme learning ma-chine is a single hidden layer feedforward neural network algorithm,and has faster learning speed and better generalization performance than traditional neural network algorithms. In this paper,aim at proposing an image compression algorithm based on extreme learning ma-chine. The algorithm achieves image compression coding and decoding with the nonlinear mapping capability of extreme learning ma-chine. Firstly,a single hidden layer feedforward neural network model for image compression is established through training the samples by using extreme learning machine. And then the model is used to compress and reconstruct image. The simulation results show that this algorithm has better reconstruction performance and faster learning speed than BP neural network.