focus depth

2000 ◽  
pp. 626-626
Author(s):  
Martin H. Weik
Keyword(s):  
Focus Depth

Genetic Family Histories: An Aid to Social Work Assessment

1993 ◽  
Vol 74 (4) ◽  
pp. 195-206 ◽  
Author(s):  
Barbara Bernhardt ◽  
Julia B. Rauch
Keyword(s):  
Social Work ◽  
Genetic Services ◽  
Case Scenario ◽  
Worst Case ◽  
Worst Case Scenario ◽  
Family Histories ◽  
Work Assessment ◽  
Focus Depth ◽  
Service Training ◽  
Agency Design

The focus, depth, and use of genetic family histories vary depending on the agency purpose and the client's presenting problem. Failure to obtain genetic family histories can result in inaccurate assessment and incomplete or misdirected services. In the worst-case scenario, failure to obtain such information and to advise clients of available genetic services are potential grounds for malpractice and wrongful-adoption suits. The authors discuss approaches to obtaining and recording genetic family histories and present criteria for referral to genetic services. The authors recommend that agency administrators consider consulting with a genetic professional to determine the appropriate focus of genetic family histories within the agency, design a protocol, and arrange in-service training in use of the protocol.

scholarly journals Investigation of an Autofocusing Method for Visible Aerial Cameras Based on Image Processing Techniques

2016 ◽  
Vol 2016 ◽  
pp. 1-12
Author(s):  
Zhichao Chen ◽  
Tao Zhang
Keyword(s):  
Image Processing ◽  
Image Processing Techniques ◽  
Accuracy Requirement ◽  
Aerospace Applications ◽  
Evaluation Functions ◽  
Focus Depth ◽  
Practical Engineering ◽  
Working Principle ◽  
Processing Techniques ◽  
Novel Design

In order to realize the autofocusing in aerial camera, an autofocusing system is established and its characteristics such as working principle and optical-mechanical structure and focus evaluation function are investigated. The reason for defocusing in aviation camera is analyzed and several autofocusing methods along with appropriate focus evaluation functions are introduced based on the image processing techniques. The proposed autofocusing system is designed and implemented using two CMOS detectors. The experiment results showed that the proposed method met the aviation camera focusing accuracy requirement, and a maximum focusing error of less than half of the focus depth is achieved. The system designed in this paper can find the optical imaging focal plane in real-time; as such, this novel design has great potential in practical engineering, especially aerospace applications.

Realization of arbitrarily long focus-depth optical vortices with spiral area-varying zone plates

2018 ◽  
Vol 414 ◽  
pp. 128-133 ◽  
Author(s):  
Chenglong Zheng ◽  
Huaping Zang ◽  
Yanli Du ◽  
Yongzhi Tian ◽  
Ziwen Ji ◽  
...  
Keyword(s):  
Optical Vortices ◽  
Zone Plates ◽  
Focus Depth

scholarly journals Normalization of Multifocal Acoustic Radiation Force Impulse Images

2017 ◽  
Vol 42 (2) ◽  
pp. 321-331
Author(s):  
Nuria González-Salido ◽  
Jorge Camacho
Keyword(s):  
Acoustic Radiation ◽  
Radiation Force ◽  
Acoustic Radiation Force ◽  
Acoustic Radiation Force Impulse ◽  
Axial Distance ◽  
Tissue Elasticity ◽  
Steering Angle ◽  
Focus Depth ◽  
Focal Zone ◽  
Normalization Process

Abstract Imaging the tissue displacements caused by Acoustic Radiation Force Impulse (ARFI) provides qualitative tissue elasticity maps around the focus. To increase imaging range, multi-focus techniques combine several images obtained with different focal depths. Since the acoustic radiation force depends on focus depth, axial distance and steering angle, a normalization process is required before blending multi-focal ARFI images so that changes in the displayed displacements represent true tissue elasticity variations. This work analyzes the sources of displacement variability in multi-focal-zone ARFI and proposes a procedure to normalize and combine partial images. The proposal is based on the system focal configuration, transducer characteristics and global tissue parameters found by ultrasonic measurements. Performance of the proposed algorithm is experimentally evaluated with tissue mimicking phantoms.

scholarly journals Unexpected Shallow Earthquake of August 1st, 2020 in the North of Indramayu, West Java, Indonesia

2021 ◽  
Vol 873 (1) ◽  
pp. 012043
Author(s):  
Jaya Murjaya ◽  
Pepen Supendi ◽  
Dwikorita Karnawati ◽  
Subagyo Pramumijoyo
Keyword(s):  
Seismic Station ◽  
Moment Tensor ◽  
Focal Mechanism Solution ◽  
West Java ◽  
Waveform Data ◽  
Arrival Times ◽  
S Waves ◽  
The North ◽  
Focus Depth ◽  
Deep Focus

Abstract During the last one hundred years, there are no shallow seismicity in the north of Java. This area is dominated by intermediate and deep focus earthquakes due to the subducted Indo-Australian slab. An earthquake with magnitude ML 4.5 struck Indramayu, north of West Java on August 1, 2020. According to the Agency for Meteorology, Climatology, and Geophysics (BMKG), the earthquake was felt III MMI scale in Indramayu and its vicinity. We used waveform data from BMKG seismic station in West Java, then we picked P-and S-waves arrival times from each station and hypocenter location was determined by Geiger method. We have detected Pn before Pg phase on four BMKG seismic stations, indicating a shallow crustal earthquake. Our inversion show that the earthquake occurred in 6.1805° S, 108.2612° E with 5 km focus depth at 16:24:38 GMT+7. Our focal mechanism solution was determined by using moment tensor inversion shows a strike-slip faulting, which corresponds to the active fault in the north of Indramayu.

An Automatic Examining-Focus System to Aerial Cameras with CCD

2012 ◽  
Vol 571 ◽  
pp. 312-315
Author(s):  
Mei Zhao ◽  
Ming Quan Yang ◽  
Fei Guo ◽  
Yu Fang Sha
Keyword(s):  
Software Design ◽  
Axial Flow ◽  
Ccd Camera ◽  
Image Plane ◽  
Displacement Sensor ◽  
Depth Range ◽  
Image Size ◽  
Technical Standards ◽  
Focus Depth ◽  
Focus Information

A system is put forward which can automatically measure focus and estimate whether the aerial camera is off-focus and the situation of the factual image plane is in the focus depth range or not. The principle, the hardware composition and the software design are discussed in detail. The system acquires examining-focus information with the optical collimate system, receives images information with CCD camera which can be regarded as optoelectric conversion apparatus, processes data with the center of gravity method, and realizes the axial flow of the CCD camera translation with the grating displacement sensor and the digital readout together. Then, the optimum image situation and the image size can be fixed on. The optimum image situation can be used to judge whether the camera is off-focus, and the image size can be used to calculate the focus. The accurate rate of examining focus can reach almost99.87% and the estimation of off-focus or not accords with experiment result of flight. Use this system, the focus of the lens and the situation of the actual image plane can be judged to accord with the technical standards or not, so that image of high quality can be get with aerial camera.

Correlative Light-Electron Fractography of Interlaminar Fracture in a Carbon–Epoxy Composite

2015 ◽  
Vol 21 (6) ◽  
pp. 1475-1481 ◽  
Author(s):  
Luis Rogerio de O. Hein ◽  
Kamila A. de Campos
Keyword(s):  
Epoxy Composite ◽  
Lateral Resolution ◽  
Fracture Mechanisms ◽  
Depth Of Focus ◽  
Electron Fractography ◽  
Interlaminar Fracture ◽  
Reinforced Composite ◽  
Height Elevation ◽  
Focus Depth ◽  
Fracture Processes

AbstractThis work evaluates the use of light microscopes (LMs) as a tool for interlaminar fracture of polymer composite investigation with the aid of correlative fractography. Correlative fractography consists of an association of the extended depth of focus (EDF) method, based on reflected LM, with scanning electron microscopy (SEM) to evaluate interlaminar fractures. The use of these combined techniques is exemplified here for the mode I fracture of carbon–epoxy plain-weave reinforced composite. The EDF-LM is a digital image-processing method that consists of the extraction of in-focus pixels for each x-y coordinate in an image from a stack of Z-ordered digital pictures from an LM, resulting in a fully focused picture and a height elevation map for each stack. SEM is the most used tool for the identification of fracture mechanisms in a qualitative approach, with the combined advantages of a large focus depth and fine lateral resolution. However, LMs, with EDF software, may bypass the restriction on focus depth and present enough lateral resolution at low magnification. Finally, correlative fractography can provide the general comprehension of fracture processes, with the benefits of the association of different resolution scales and contrast modes.

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