• Title/Summary/Keyword: 촬영지

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Ottonello Projection Techniques using the Metronome (메트로놈을 이용한 Ottonello 촬영 기법)

  • Im, In-Chul;Kim, Chang-Soo
    • The Journal of the Korea Contents Association
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    • v.9 no.12
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    • pp.730-734
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    • 2009
  • The ottonello method is used to see a front view image of cervical 1-7 number. The study found a systematic examination method to find a better image through an experiment using metronome. The results are as follows: In an evaluation of MTF, when used 0.5 standard of MTF, oral explanation resulted 1.2 LP/mm, Moderato-100 1.4 LP/mm, Allegro-138 1.6 LP/mm, Presto-184 2.4 LP/mm. Among them presto-184 showed the highest sharpness with 2.4 LP/mm. In an image reading by a medicine doctor of radiology, when oral explanation was 17%, Moderato-100 15%, Allegro-138 18%, Presto-184 50%. Among themprest-184 was evaluated as the best image. The result of was a method to reduce an image repeat, patients radiation exposure, patients waiting time for examination, material and so on.

Estimation of Fingerprint Image Quality in Accordance with Photographing Conditions (촬영 조건에 따른 지문 사진의 품질에 관한 연구)

  • Yu, Je-Seol;Jeon, So-Young;Kim, Kyu-Yeon;Kim, Ji-Yeon;Kim, Chae-Won;Jang, Jake
    • The Journal of the Korea Contents Association
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    • v.17 no.6
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    • pp.287-295
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    • 2017
  • This study is aimed at observing effects of fingerprint image quality on various photographing conditions in the aspect of resolution. Discrimination between two friction ridges plays an important role in the value of fingerprint image, and it can be confirmed with quantification of pixels of boundary region which is existing between two friction ridges. In this study, several factors were estimated with same fingerprint image using Adobe photoshop CS 6 for analysis: changes of image quality by ISO, movement when photographing, and photographers' experience and skill. Consequently, there was no significant change of image quality by ISO. Furthermore, there was no significant difference in the hand-held images between crime scene investigators and laymen, yet there was significant difference between hand-held images and images using tripod in the aspect of resolution. This study shows that using tripod is very important in forensic fingerprint photography through empirical methods.

Relationship between the Distribution of Space doses in X-ray Rooms and the "Inverse Square Law of Distance" (X선 촬영실 내 공간선량의 분포와 거리 역자승 법칙과의 관련성)

  • Choi, Seong-Kwan
    • The Journal of the Korea Contents Association
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    • v.13 no.8
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    • pp.301-307
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    • 2013
  • In the present study, space doses generated during X-ray radiography of hand, head, and abdomen, etc. were examined and whether the intensity of space doses of scattering rays is attenuated by the "inverse square law of distance" was figured out. First, the space doses of X-ray with small amounts of generated scattering rays such as hand radiography were mostly attenuated by the "inverse square law of distance" and were not detected at all at a distance of 2m. Second, the space doses of X-ray with large amounts of generated scattering rays such as head or abdomen radiography attenuated in higher rates than the rates under the "inverse square law of distance" at distances ranging from 30cm to 1m from the center of the irradiation field and were attenuated by the "inverse square law of distance" at distances ranging from 1m to 2m. Therefore, in X-ray rooms, the subject should be at least 2m away from the center of the irradiation field in the case of hand radiography and X-ray exposure prevention actions using protective devices are required in the entire spaces of the X-ray rooms in the case of head or abdomen radiography.

Design for Adhesive Carbon Heating Element X-ray Table with an Attached Heating Device (가열장치를 구비한 부착형 탄소발열체 X선 촬영대 고안)

  • Song, Jongnam;Kim, Eungkon
    • Journal of the Korean Society of Radiology
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    • v.9 no.3
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    • pp.131-137
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    • 2015
  • The purpose of this study is to warm up the conventional X-ray table by inventing and design for X-ray table with an attached heating device using less unloaded X-ray, CNT (carbon nano tube) heating element. Configuration of the product design for adhesive carbon heating element X-ray is composed of a conventional X-ray table, carbon nano tube planar heating element, an electrode line, flame resisting protective film, and the bottom film. Characteristics and advantages of this invented product is to provide gentle feeling, the sense of security, and eliminating anxiety to the patient wearing a patient gown and feel the cool air while receiving the test. Thus we are strongly recommend to use this device in the clinical situation.

A Study of Radiographic Methods to X-ray Study of Patients with Spinal Scoliosis and Vertebrae Bone Fracture of Lumbar Spine (척주측만증과 허리뼈 골절 수술 환자의 엑스선 촬영법 연구)

  • Ahn, Byung-Ju;Lee, Jun-Haeng
    • Journal of the Korean Society of Radiology
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    • v.13 no.3
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    • pp.425-431
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    • 2019
  • The Study In order to obtain images of overlap of the two iron cores in the spinal cord simple x-ray scan after surgery of patients with ulcer lateral sclerosis and a fractured backbone, the researcher conducted a subjective evaluation on five radiographers of the university hospital's imaging department for more than 10 years. The results of the experiment showed that the lateral shot of lateral scoliosis of the spinal cord was taken with the middle face of the IR plane, and then the X-ray tube angle was taken vertically with the vertical spinal column fan-tom position, resulting in two overlapping images and high scores in the subjective evaluation. In addition, lateral shots of the lumbar dislocation fractured lumbar vertebrae were taken with the forehead aligned with the center of the IR plane and then with the X-ray angle perpendicular to the fourth waistline and the angle of the spinal cord perpendicular to the fourth waistline, the image of the two iron cores could be obtained from the radiographer.

Case Study : Cinematography using Digital Human in Tiny Virtual Production (초소형 버추얼 프로덕션 환경에서 디지털 휴먼을 이용한 촬영 사례)

  • Jaeho Im;Minjung Jang;Sang Wook Chun;Subin Lee;Minsoo Park;Yujin Kim
    • Journal of the Korea Computer Graphics Society
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    • v.29 no.3
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    • pp.21-31
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    • 2023
  • In this paper, we introduce a case study of cinematography using digital human in virtual production. This case study deals with the system overview of virtual production using LEDs and an efficient filming pipeline using digital human. Unlike virtual production using LEDs, which mainly project the background on LEDs, in this case, we use digital human as a virtual actor to film scenes communicating with a real actor. In addition, to film the dialogue scene between the real actor and the digital human using a real-time engine, we automatically generated speech animation of the digital human in advance by applying our Korean lip-sync technology based on audio and text. We verified this filming case by using a real-time engine to produce short drama content using real actor and digital human in an LED-based virtual production environment.

A Study on Dose Reduction in Infant Skull Radiography (유아 두개골 방사선촬영에서 피폭선량 감쇄에 관한 연구)

  • Ahn, Byoung-Ju
    • Journal of the Korean Society of Radiology
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    • v.11 no.5
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    • pp.387-392
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    • 2017
  • When an infant has visited a hospital due to skull fracture, the rupture of a blood vessel, or skin wounds on the head resulted from an incident, accident, traffic accident, or disease, he/she becomes to undergo anterior/posterior and lateral skull imaging, which is a head test at the department of radiology. In the head test, if the adult skull imaging grid is applied to the imaging, the secondary radiation will be removed to enhance the contrast of the image. However, among the radiation exposure conditions, the tube voltage should be enhanced by 8~10 kVp leading to an increase in the patient exposure. The present study was conducted under assumption that if the same images can be obtained from infant skull imaging without using the skull imaging grid, the exposure dose will be reduced and the artifacts due to grid cut off can be prevented. The researcher measured the radiation dosage using a radiation meter and conducted the subjective evaluation (ROC, receiver operating characteristic) among medical image evaluation methods. Based on the results, when the images were taken without using the grid, the exposure dose was reduced by 0.019 mGy in the anterior/posterior imaging and by 0.02 mGy in the lateral imaging and the image evaluation score was higher by 4 points. In conclusion, if the images of the skulls of infants that visited the hospital are taken with out using the grid, the exposure dose can be reduced, the image artifacts due to grid cut off can be prevented, and the lifespan of the X-ray tube will be extended.

Contemplation on Usefulness of Plane Cone for Taking Image of Intercondyloid Fossa (무릎 과간와(Intercondyloid fossa) 촬영용 평면 Cone의 유용성에 대한 고찰)

  • Shin, WoonJae
    • Journal of the Korean Society of Radiology
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    • v.9 no.7
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    • pp.501-508
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    • 2015
  • There are various Intercondyloid fossa X-ray taking methods. The methods carried out in clinics are Holmblad method, Camp-Conventry method, and Beclere method. Taking image of Intercondyloid fossa is carried a lot as basic examination for diagnosis related to simple fracture and cruciate ligament. Considering the condition and pains of patients, safe method is chosen but because Holmblad method can cause pains to knee part adhering to cassette, it is not easily used. In this study self-produced plane circular cone was attached to a cassette and in the posture for Holmblad method questionnaires of 100 applicants were analyzed to understand cognition on alleviation of pains, and the concentration of imge quality by scattering rays was measured with densitometer by taking human body phantom with X-ray. As a result, in the posture for Holmblad method, cognition on pains was alleviated by average 99%, and the change of concentration of X-ray film taken using phantom by scattering rays decreased statistically significantly compared to the cassette which did not use self-produced plane cone, therefor it is thought that the method can be valuably used in clinics.

Implementation of AUSV System for Sonar Image Acquisition (소나 영상 획득을 위한 무인자율항법 시스템 구현)

  • Ryu, Jae Hoon;Ryu, Kwang Ryol
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.11
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    • pp.2162-2166
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    • 2016
  • This paper describes the implementation of AUSV system for sonar image acquisition to survey the seabed. The system is controlled by Feed Forward PID algorithm on the vessel for bearing of the thrusters composed of motion sensor and DGPS which calculates the differences between the current location and the destination location for longitude and latitude based on GPS coordinates. As experimental results, the bearing control performance is good that the error distance from the destination positions are under 6m in total survey track of 1km. And the sonar image deviation of a object is under 12 pixels from the manned survey method, which the comparison with the total image quality is almost the same as the manned survey one. Thus the proposed AUSV system is a new method of system can be utilized at the limited survey areas as the surveyor should not be able to approach on sea surface by onboard vessel.

Slow Sync Image Synthesis from Short Exposure Flash Smartphone Images (단노출 플래시 스마트폰 영상에서 저속 동조 영상 생성)

  • Lee, Jonghyeop;Cho, Sunghyun;Lee, Seungyong
    • Journal of the Korea Computer Graphics Society
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    • v.27 no.3
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    • pp.1-11
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    • 2021
  • Slow sync is a photography technique where a user takes an image with long exposure and a camera flash to enlighten the foreground and background. Unlike short exposure with flash and long exposure without flash, slow sync guarantees the bright foreground and background in the dim environment. However, taking a slow sync image with a smartphone is difficult because the smartphone camera has continuous and weak flash and can not turn on flash if the exposure time is long. This paper proposes a deep learning method that input is a short exposure flash image and output is a slow sync image. We present a deep learning network with a weight map for spatially varying enlightenment. We also propose a dataset that consists of smartphone short exposure flash images and slow sync images for supervised learning. We utilize the linearity of a RAW image to synthesize a slow sync image from short exposure flash and long exposure no-flash images. Experimental results show that our method trained with our dataset synthesizes slow sync images effectively.