Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Image Resolution Enhancement via Data-Driven Parametric Models in the Wavelet Space | Hindawi Publishing Corporation EURASIP Journal on Image and Video Processing Volume 2007 Article ID41516 12 pages doi 2007 41516 Research Article Image Resolution Enhancement via Data-Driven Parametric Models in the Wavelet Space XinLi Lane Department of Computer Science and Electrical Engineering West Virginia University Morgantown WV26506-6109 USA Received 11 August 2006 Revised 29 December 2006 Accepted 9 January 2007 Recommended by James E. Fowler We present a data-driven project-based algorithm which enhances image resolution by extrapolating high-band wavelet coefficients. High-resolution images are reconstructed by alternating the projections onto two constraint sets the observation constraint defined by the given low-resolution image and the prior constraint derived from the training data at the high resolution HR . Two types of prior constraints are considered spatially homogeneous constraint suitable for texture images and patch-based inhomogeneous one for generic images. A probabilistic fusion strategy is developed for combining reconstructed HR patches when overlapping redundancy is present. It is argued that objective fidelity measure is important to evaluate the performance of resolution enhancement techniques and the role of antialiasing filter should be properly addressed. Experimental results are reported to show that our projection-based approach can achieve both good subjective and objective performance especially for the class of texture images. Copyright 2007 Xin Li. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Depending on the presence of antialiasing filer there are two ways of formulating the resolution enhancement problem for still images that is how to obtain a high-resolution HR image from its low-resolution LR version When no antialiasing filter is .
