A vision sensor calibration method based on flexible three-dimensional (3d) target and invariance of cross ratio is proposed. Flexible 3d target is obtained by moving planar target to different positions. According to the relative position relationship of planar targets in the different positions, unify target points to the base coordinate frame of the flexible 3d target. Using the invariance o...

One-point, Linear, Hyperbolic and Polynomial calibration approaches were adopted to elucidate the quantitative effectiveness of standard solutions of 10 to 800 ng/mL secobarbital by comparing theoretical and observed concentrations. Different concentrations of internal standard(IS), 50 and 200 ng/mL, were added to standard solutions for comparison purpose. Two GC column temperature programs, a ...

FIG. 1. The GDPTV method is based on a single-camera setup for determining the 3D particle positions via defocused particle images, where the particle images change as function of the depth coordinate. To get a target particle position, the particle image is compared to a set of calibration images by use of the normalized cross-correlation. The out-of-plane coordinate for the target particle is...

WFV (Wide Field of View) cameras on-board Gaofen-1 satellite (gaofen means high resolution) provide unparalleled global observations with both high spatial and high temporal resolutions. However, the accuracy of the radiometric calibration remains unknown. Using an improved cross calibration method, the WFV cameras were re-calibrated with well-calibrated Landsat-8 OLI (Operational Land Imager) ...

This work summarizes the overall calibration strategy for WFPC2, covering the design of the observational programs as well as analysis of the results and their incorporation into the calibration pipeline. This strategy comprises routine long-term calibration monitoring programs, including darks, biases, flat fields, photometric and astrometric monitoring, as well as special calibration programs...