A variational approach to 3D geometry reconstruction from two or multiple views

[EN] In the last years we have developed some methods for 3D reconstruction. First we began with the problem of reconstructing a 3D scene from a stereoscopic pair of images. We developed some methods based on energy functionals which produce dense disparity maps by preserving discontinuities from image boundaries. Then we passed to the problem of reconstructing a 3D scene from multiple views (more than 2). The method for multiple view reconstruction relies on the method for stereoscopic reconstruction. For every pair of consecutive images we estimate a disparity map and then we apply a robust method that searches for good correspondences through the sequence of images. Recently we have proposed several methods for 3D surface regularization. This is a postprocessing step necessary for smoothing the final surface, which could be afected by noise or mismatch correspondences. These regularization methods are interesting because they use the information from the reconstructing process and not only from the 3D surface. We have tackled all these problems from an energy minimization approach. We investigate the associated Euler-Lagrange equation of the energy functional, and we approach the solution of the underlying partial differential equation (PDE) using a gradient descent method.

A new information fusion method for land-use classification using high resolution satellite imagery

Satellite image classification involves designing and developing efficient image classifiers. With satellite image data and image analysis methods multiplying rapidly, selecting the right mix of data sources and data analysis approaches has become critical to the generation of quality land-use maps. In this study, a new postprocessing information fusion algorithm for the extraction and representation of land-use information based on high-resolution satellite imagery is presented. This approach can produce land-use maps with sharp interregional boundaries and homogeneous regions. The proposed approach is conducted in five steps. First, a GIS layer - ATKIS data - was used to generate two coarse homogeneous regions, i.e. urban and rural areas. Second, a thematic (class) map was generated by use of a hybrid spectral classifier combining Gaussian Maximum Likelihood algorithm (GML) and ISODATA classifier. Third, a probabilistic relaxation algorithm was performed on the thematic map, resulting in a smoothed thematic map. Fourth, edge detection and edge thinning techniques were used to generate a contour map with pixel-width interclass boundaries. Fifth, the contour map was superimposed on the thematic map by use of a region-growing algorithm with the contour map and the smoothed thematic map as two constraints. For the operation of the proposed method, a software package is developed using programming language C. This software package comprises the GML algorithm, a probabilistic relaxation algorithm, TBL edge detector, an edge thresholding algorithm, a fast parallel thinning algorithm, and a region-growing information fusion algorithm. The county of Landau of the State Rheinland-Pfalz, Germany was selected as a test site. The high-resolution IRS-1C imagery was used as the principal input data.

Ozark -- Piedmont

[drawn by Erwin Raisz].

Sable I. -- Fredericton N.B

[drawn by Erwin Raisz].

The round up.

Numbering of issues for July 3, 1920-June 25, 1921 is irregular. Issues for July 3-Dec. 25, 1920 and for Jan. 8-June 25, 1925 are called v. 8 and 9, respectively, in this library.

A student's manual for the study of marketing of agricultural products.

Mode of access: Internet.

An answer by the co-ops,

Cover title.

Annual report.

"A cooperative regional project ... conducted by thirteen Southern States, the Commonwealth of Puerto Rico, and the Animal Husbandry Research Division, Agricultural Research Service, United States Department of Agriculture."

A new plan for the construction of a storage celler /

"New series" vol. IV, no. 11.

Cost of marketing grain; a history of certain carloads of grain from the farmer to the terminal buyer,

Mode of access: Internet.

Soviet agricultural commodity trade, 1960-76 : a statistical survey : a reference aid.

Mode of access: Internet.

U.S. agricultural trade with west Asia and Africa /

Chiefly tables.

Principles and practice of agricultural analysis; a manual for the study of soils, fertilizers, and agricultural products; for the use of analysists, teachers, and students of agricultural chemistry.

v. 1. Soils. -v. 2. Fertilizers and insecticides. -v.3. Agricultural products.

Report.

Report year irregular.

The international railway and steam navigation guide.

Description based on: no. 160 (Dec. 1877).