OPTICAL CODE READER

In an optical code reader of the imager type, comprising at least one not collimated light source having an illumination optics associated therewith, and a photodetector device having a receiving optics associated therewith, at least one lens of the illumination optics and at least one lens of the receiving optics are displaceable together to change their distance from said at least one light source and from said photodetector device, respectively

Investigation of extended depth-of-field f/8 camera with optimized cubic phase mask and digital restoration

An investigation of extended depth-of-field camera with optimized phase mask and digital restoration is presented. The goal of this paper is to implement the wavefront coding technique without affecting much of the original design, and the design has taken the complexity of imaging system into consideration. The optimized strength of cubic phase mask (CPM) is based on the analytical optimal solution for the task-based imaging system [J. Opt. Soc. Am. A 25, 1064 (2008)]. The noisy intermediate images of CPM system with highest spatial frequency of interest can be effectively restored by vector-based Richardson-Lucy algorithm. Restoration from the system with generalized CPM produces precise image position than the system with CPM does. In general, the CPM system procures modulation transfer function higher than 0.195 in the whole depth-of-field, and the mean squared error of the restored images are less than 5 %

Investigation of extended depth-of-field f/8 camera with optimized cubic phase mask and digital restoration

An investigation of extended depth-of-field camera with optimized phase mask and digital restoration is presented. The goal of this paper is to implement the wavefront coding technique without affecting much of the original design, and the design has taken the complexity of imaging system into consideration. The optimized strength of cubic phase mask (CPM) is based on the analytical optimal solution for the task-based imaging system [J. Opt. Soc. Am. A 25, 1064 (2008)]. The noisy intermediate images of CPM system with highest spatial frequency of interest can be effectively restored by vector-based Richardson-Lucy algorithm. Restoration from the system with generalized CPM produces precise image position than the system with CPM does. In general, the CPM system procures modulation transfer function higher than 0.195 in the whole depth-of-field, and the mean squared error of the restored images are less than 5 %

Investigation of extended depth-of-field f/8 camera with optimized cubic phase mask and digital restoration

An investigation of extended depth-of-field camera with optimized phase mask and digital restoration is presented. The goal of this paper is to implement the wavefront coding technique without affecting much of the original design, and the design has taken the complexity of imaging system into consideration. The optimized strength of cubic phase mask (CPM) is based on the analytical optimal solution for the task-based imaging system [J. Opt. Soc. Am. A 25, 1064 (2008)]. The noisy intermediate images of CPM system with highest spatial frequency of interest can be effectively restored by vector-based Richardson-Lucy algorithm. Restoration from the system with generalized CPM produces precise image position than the system with CPM does. In general, the CPM system procures modulation transfer function higher than 0.195 in the whole depth-of-field, and the mean squared error of the restored images are less than 5 %.ImPhys/Optic

The relationship between ultrasonographic parameters and densitometric data in the analysis of body composition.

Purpose: Our aim was to investigate the link between adiposity fat indexes obtained using ultrasound (US) examination, total and android fat amount by dual-energy x-ray absorptiometry (DXA), and body weight (BW) in normal-weight, over-weight and obese subjects. Material & Methods: We retrospectively analyzed body composition (BC) parameters of 138 normal-weight (62M, 76F, age 41.2613.6year-old, BMI 22.361.5Kg/m2), 92 over-weight (60M, 32F, age 48.2613.3year-old, BMI 27.061.4Kg/m2) and 42 obese (4M, 38F, age 49.9612.8year-old, BMI 37.066.0Kg/m2) subjects. Data were collected from different studies in our Hospital where US and DXA evaluations were simultaneously performed for BC assessment. The carotid intimal-medial-thickness (CIMT), the ratio between minimum subcutaneous fat-thickness and maximum pre-peritoneal fat-thickness (wall-fat-index – WFI), and that one between maximum subcutaneous fat-thickness and intra-abdominal fat-thickness (MAR) were considered for US evaluations. Simple regression and ANOVA were used for the analysis (only p,0.05 were considered). Results: In all groups, WFI had significant correlations with total fat mass (FM) and FM percentage, while MAR got a relation with only BW; moreover, CIMT was related to android and whole-body FM. FM percentage in android region was linked to MAR and WFI only in normal-weight and over-weight subjects. Android FM was correlated with MAR only in normal-weight subjects. Conclusion: DXA, US and BW look at the human body from different points of view. An integration of these three techniques should be considered when the assessment of BC is needed

The influence of phase mask position upon wavefront coded system: doublet imaging system

Cubic phase wavefront coding technique is applied to an imaging system with the aim of extending the depth of field (DOF). The design is based on the wavefront coding method proposed by Dowski and Cathey1. The method employs a cubic phase mask (CPM) to modify the point spread function (PSF) of the imaging system under incoherent illumination such that the PSF of the system is formed as an isosceles right triangle, which makes the PSF insensitive to defocus. Researchers have found the optimized values of cubic phase coefficient and the exit pupil distance for the given specifications for solving wavefront coded task-based imaging problem2. The extended DOF design is usually based on placing a phase mask exactly in the pupil plane of the imaging system. However, this is not always practical because the complex design of the imaging system leads to a limited practical advantage of this kind of arrangement. In this work, the influence of phase mask position upon wavefront coding technique in the doublet imaging system is studied. The main goal is to find the position where to place the CPM in the imaging system, which type of arrangement can effectively improve the modulation transfer function. Finally, we compare two system configurations, front aperture stop and rear aperture stop in designing the doublet wavefront coded system.Horizon 2020ImPhys/Optic