Stability analysis for a multi-camera photogrammetric system.

Consumer-grade digital cameras suffer from geometrical instability that may cause problems when used in photogrammetric applications. This paper provides a comprehensive review of this issue of interior orientation parameter variation over time, it explains the common ways used for coping with the issue, and describes the existing methods for performing stability analysis for a single camera. The paper then points out the lack of coverage of stability analysis for multi-camera systems, suggests a modification of the collinearity model to be used for the calibration of an entire photogrammetric system, and proposes three methods for system stability analysis.

PCR studies on the presence of Chlamydia trachomatis in the upper urinary tract of patients with obstructive pyelonephritis.

Chlamydia trachomatis infections are among the most common sexually transmitted diseases in the world and it is only logical to hypothesize that it alone or in association with mycoplasmas can participate in the initiation and persistence of upper urinary tract infections. Having in mind the inconclusive evidence regarding the role of C. trachomatis in upper urinary tract infections we decided to study the presence of C.