Author Affiliations
Abstract
1 Center for Optics, Photonics and Lasers, Department of Physics, Physical Engineering and Optics, Laval University, Quebec G1V0A6, Canada
2 Inner Mongolia Electronic Information Vocational Technical College, Huhhot 010070, China
3 School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
4 Inner Mongolia Normal University, Huhhot 010020, China
We give a brief overview on the more than 50 years of development of the moment-based image description, the moment invariants, and the orthogonal moments. Some basic ideas for significantly improving the performance of the image moment-based methods, such as the use of the low-order radial moments for reducing information suppression drawback and the separation of the radial basis from the circular harmonic basis for a free selection of the orthogonal radial polynomials, are presented. Performance measures for the orthogonal moments are discussed from the point of view of image analysis. A moment family list is proposed, which includes most of the representative moments in use and the discrete orthogonal moments.
100.5760 Rotation-invariant pattern recognition 100.4994 Pattern recognition, image transforms 100.2000 Digital image processing 100.2960 Image analysis Chinese Optics Letters
2016, 14(9): 091001
Author Affiliations
Abstract
1 State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou 310027, China
2 Computer Science Department, University of Southern California, 941 Bloom Walk, Los Angeles, CA 90089, USA
Image registration is an old topic but has a new application in deep-sky imaging fields named live stacking. In this Letter, we propose a live stacking algorithm based on star detection, description, and matching. A thresholding method based on Otsu and centralization is proposed to implement star detection. Then, a translation and rotation invariant descriptor is proposed to provide accurate feature matching. Extensive experiments illustrate that our proposed method is feasible in deep-sky image live stacking.
150.1135 Algorithms 100.4994 Pattern recognition, image transforms 350.1260 Astronomical optics Chinese Optics Letters
2016, 14(12): 121501
Author Affiliations
Abstract
School of Instrumentation Science and Opto-Electronics Engineering, Beihang University, Beijing 100191, China
The third-order ghost imaging with the second-order intensity correlation is theoretically and experimentally demonstrated. The resolution and visibility of the reconstructed image are discussed, and the relationship between resolution and visibility is analyzed. The theoretical results show that a tradeoff exists between the visibility and resolution of the reconstructed image; the better the image resolution, the worse the image visibility. Numerical simulations are carried out to verify this theory, and a ghost imaging experiment is conducted to validate our calculations. The experimental results agree with the theoretical predictions.
“鬼”成像 图像识别 光强度关联 100.4994 Pattern recognition, image transforms 110.2960 Image analysis Chinese Optics Letters
2011, 9(8): 081102
Author Affiliations
Abstract
State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China
A new organic-inorganic hybrid material, which shows photo-induced reduction of refractive index as well as volume contraction, is prepared using a sol-gel method. This material is coated on a Si substrate by spin-coating to manufacture film. After irradiated by ultraviolet (UV) light with a deuterium lamp for 5 h, the thickness of film decreases largely by 55%, and the refractive index of film changes from 1.484 to 1.445 at 550 nm. The film’s optical thickness exhibits an exponential change with the increasing irradiation time. Futhermore, the photo-patternning of the organic-inorganic hybrid film without any further process (wet etching and thermal curing) is performed utilizing the volume contraction on UV-light irradiation. This film has potential applications for fabrication of patterned filter array and apodizing filter by direct light writing, and also demonstrates good temperature stability and immunity to visible light exposure.
光学薄膜 光敏材料 光敏性能 光致图形化 160.5335 Photosensitive materials 310.6860 Thin films, optical properties 100.4994 Pattern recognition, image transforms Chinese Optics Letters
2010, 8(4): 435
