2015/02/11 by Dai-Qiang Chen, Chen, Dai-Qiang
Computer Science · Engineering · #65T60 #68U10 #90C90 #Advanced Image Fusion Techniques #Computer Vision and Pattern Recognition (cs.CV) #FOS: Computer and information sciences #Image and Signal Denoising Methods #Sparse and Compressive Sensing Techniques
paper · pdf · doi:10.48550/arxiv.1502.03273
openalex publication_date 2015/02/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Sparse representation of images under certain transform domain has been playing a fundamental role in image restoration tasks. One such representative method is the widely used wavelet tight frame systems. Instead of adopting fixed filters for constructing a tight frame to sparsely model any input image, a data-driven tight frame was proposed for the sparse representation of images, and shown to be very efficient for image denoising very recently. However, in this method the number of framelet filters used for constructing a tight frame is the same as the length of filters. In fact, through further investigation it is found that part of these filters are unnecessary and even harmful to the recovery effect due to the influence of noise. Therefore, an improved data-driven sparse representation systems constructed with much less number of filters are proposed. Numerical results on denoising experiments demonstrate that the proposed algorithm overall outperforms the original data-driven tight frame construction scheme on both the recovery quality and computational time.