• Title/Summary/Keyword: Semi-Automatic

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Semi-automatic System for Mass Detection in Digital Mammogram (디지털 마모그램 반자동 종괴검출 방법)

  • Cho, Sun-Il;Kwon, Ju-Won;Ro, Yong-Man
    • Journal of Biomedical Engineering Research
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    • v.30 no.2
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    • pp.153-161
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    • 2009
  • Mammogram is one of the important techniques for mass detection, which is the early diagnosis stage of a breast cancer. Especially, the CAD(Computer Aided Diagnosis) using mammogram improves the working performance of radiologists as it offers an effective mass detection. There are two types of CAD systems using mammogram; automatic and semi-automatic CAD systems. However, the automatic segmentation is limited in performance due to the difficulty of obtaining an accurate segmentation since mass occurs in the dense areas of the breast tissue and has smoother boundaries. Semi-automatic CAD systems overcome these limitations, however, they also have problems including high FP (False Positive) rate and a large amount of training data required for training a classifier. The proposed system which overcomes the aforementioned problems to detect mass is composed of the suspected area selection, the level set segmentation and SVM (Support Vector Machine) classification. To assess the efficacy of the system, 60 test images from the FFDM (Full-Field Digital Mammography) are analyzed and compared with the previous semi-automatic system, which uses the ANN classifier. The experimental results of the proposed system indicate higher accuracy of detecting mass in comparison to the previous systems.

Volumetric CT Texture Analysis of Intrahepatic Mass-Forming Cholangiocarcinoma for the Prediction of Postoperative Outcomes: Fully Automatic Tumor Segmentation Versus Semi-Automatic Segmentation

  • Sungeun Park;Jeong Min Lee;Junghoan Park;Jihyuk Lee;Jae Seok Bae;Jae Hyun Kim;Ijin Joo
    • Korean Journal of Radiology
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    • v.22 no.11
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    • pp.1797-1808
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    • 2021
  • Objective: To determine whether volumetric CT texture analysis (CTTA) using fully automatic tumor segmentation can help predict recurrence-free survival (RFS) in patients with intrahepatic mass-forming cholangiocarcinomas (IMCCs) after surgical resection. Materials and Methods: This retrospective study analyzed the preoperative CT scans of 89 patients with IMCCs (64 male; 25 female; mean age, 62.1 years; range, 38-78 years) who underwent surgical resection between January 2005 and December 2016. Volumetric CTTA of IMCCs was performed in late arterial phase images using both fully automatic and semi-automatic liver tumor segmentation techniques. The time spent on segmentation and texture analysis was compared, and the first-order and second-order texture parameters and shape features were extracted. The reliability of CTTA parameters between the techniques was evaluated using intraclass correlation coefficients (ICCs). Intra- and interobserver reproducibility of volumetric CTTAs were also obtained using ICCs. Cox proportional hazard regression were used to predict RFS using CTTA parameters and clinicopathological parameters. Results: The time spent on fully automatic tumor segmentation and CTTA was significantly shorter than that for semi-automatic segmentation: mean ± standard deviation of 1 minutes 37 seconds ± 50 seconds vs. 10 minutes 48 seconds ± 13 minutes 44 seconds (p < 0.001). ICCs of the texture features between the two techniques ranged from 0.215 to 0.980. ICCs for the intraobserver and interobserver reproducibility using fully automatic segmentation were 0.601-0.997 and 0.177-0.984, respectively. Multivariable analysis identified lower first-order mean (hazard ratio [HR], 0.982; p = 0.010), larger pathologic tumor size (HR, 1.171; p < 0.001), and positive lymph node involvement (HR, 2.193; p = 0.014) as significant parameters for shorter RFS using fully automatic segmentation. Conclusion: Volumetric CTTA parameters obtained using fully automatic segmentation could be utilized as prognostic markers in patients with IMCC, with comparable reproducibility in significantly less time compared with semi-automatic segmentation.

Development of a Pneumatic Semi-Automatic Clutch for Commercial Vehicles based on the CAN Communication (CAN통신 기반의 상용차용 공압구동형 세미오토 클러치 개발)

  • Kim, Seong-Jin;Lee, Dong-Gun;Ahn, Kyeong-Hwan;Lee, Seong-Cheol
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.15 no.8
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    • pp.4742-4748
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    • 2014
  • A semi-automatic clutch was developed for drivers of vehicles with manual transmission. The clutch is operated by pressing a switch on the gear stick without stepping on a clutch pedal when the driver wants to shift gears. To automatic control a clutch, driving information is provided by sensors installed under the vehicle. On the other hand, sensors are prone to failure under severe driving conditions and a long time is needed to install or repair these sensors in the vehicle. In this paper, a semi-automatic clutch that received driving information by CAN communication from the ECU was developed and a pneumatic actuator was used to operate the clutch. The semi-automatic clutch by a pneumatic cylinder was operated with a supply air pressure of more than 3bar.

Hair-Blending Method for 2D Virtual Color Hairstyler Based on Semi-automatic Field Morphing (반자동 필드 모핑에 기반한 2D 가상 컬러 헤어스타일러의 모발 블렌딩 방법)

  • Kwak, Noyoon
    • Proceedings of the Korea Contents Association Conference
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    • 2008.05a
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    • pp.3-9
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    • 2008
  • This paper is related to hair-blending for 2D virtual color hairstyler based on the semi-automatic field morphing. The proposed 2D virtual color hair-styler is characterized as generating virtual hairstyles using the variable morphing mask instead of the fixed one for the semi-automatic morphing, and then hair-blending the generated virtual hairstyles using sigmoid function around the boundary region of the variable morphing mask. The proposed method is able to generate the virtual hairstyles with an easy-to-use interface based on semi-automatic field morphing. According to the proposed method, a user can shorten the working time and even an unskilled user can obtain natural hairstyles as he or she designates a small number of external user inputs.

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The Analysis on the Characteristics and the Structure of the Semi Automatic Dongdahoe Loom (전통 반자동식 동다회직기의 특성과 구조 분석에 관한 연구)

  • Park, Yoon Mee
    • Journal of the Korean Society of Costume
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    • v.65 no.6
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    • pp.15-24
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    • 2015
  • Dahoe is a traditional Korean term for cords and Dongdahoe for round cords. The main purpose of this study is to analyze the structure of a semi-automatic loom depicted in the paintings of Jun Geun Kim, and verify whether it actually worked or not. Jun Geun Kim is a genre painter of the late Joseon Dynasty. His nom de plume is Gisan and he drew genre paintings for foreigners who visited Korea in the late 19th century. These paintings are important in understanding the lifestyle and custom of the times. His paintings at the Staatliche Museen zu Berlin in Germany and the British Museum in England both depict a semi automatic loom that operates two looms at the same time. This is a unique loom that is not found in any other country and currently no artifacts of such loom exist in Korea. The study went through the following steps: We first analyzed the structure and the operating mechanism of the loom in the painting. The structure of each parts and their roles were also analyzed. Then a loom that was similar in structure and size was made to check if it was operational. The loom depicted in the paintings had some problems, and adjustments to fix the said problems were made accordingly. Wood was primarily used to make the $80{\times}90cm$ loom. The loom was used to make Dahoe and the study confirmed that there were no differences between the handmade Dongdahoe and the Dongdahoe made with the semi automatic loom.

Development of Semi-automatic Gas Metal Arc Welding Equipment for Fire Piping and Evaluation of Characteristics of Weld Joints (소방배관용 강관을 위한 반자동 가스메탈아크용접장치 개발과 용접부 특성평가)

  • Lim, Young-Min;Oh, Tae-Suk;Jo, Hyun;Koh, Jin-Hyun
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.4
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    • pp.1460-1465
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    • 2012
  • The semi-automatic gas metal arc welding equipment was developed and the weldability of zinc coated steel pipes was evaluated in terms of strength, porosity and welding parameters including shielding gas composition. The good bead appearance and the reduction of porosity in the welds could be possibly obtained by adding $O_2$ to Ar. The strength and joint efficiency of welds made by the semi-automatic welding equipment was about 1.8 times higher compared with welds manually made. The integrity of welds was confirmed by the water pressure test as well, Finally, it is expected that the weld productivity will be enhanced even unskilled welders can produce quality welds by operating the semi-automatic welding equipment.

Artificial Intelligence-Based Video Content Generation (인공지능 기반 영상 콘텐츠 생성 기술 동향)

  • Son, J.W.;Han, M.H.;Kim, S.J.
    • Electronics and Telecommunications Trends
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    • v.34 no.3
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    • pp.34-42
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    • 2019
  • This study introduces artificial intelligence (AI) techniques for video generation. For an effective illustration, techniques for video generation are classified as either semi-automatic or automatic. First, we discuss some recent achievements in semi-automatic video generation, and explain which types of AI techniques can be applied to produce films and improve film quality. Additionally, we provide an example of video content that has been generated by using AI techniques. Then, two automatic video-generation techniques are introduced with technical details. As there is currently no feasible automatic video-generation technique that can generate commercial videos, in this study, we explain their technical details, and suggest the future direction for researchers. Finally, we discuss several considerations for more practical automatic video-generation techniques.

Development of a Semi-automatic Search Program for Crown Delineation Based on Watershed and Valley Following Algorithms

  • Sim, Woodam;Park, Jeongmook;Lee, Jungsoo
    • Journal of Forest and Environmental Science
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    • v.34 no.2
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    • pp.142-144
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    • 2018
  • This paper discusses the development of semi-automatic search program for crown delineation in stand level. The crown of an individual tree was delineated by applying the Watershed (WS) and Valley Following (VF) algorithms. Unmanned Aerial Vehicle (UAV) images were used in the semi-automatic search program to delineate the crown area. The overall accuracy and Khat were used in accuracy assessment. WS algorithm's model showed the overall accuracy and Khat index of 0.80 and 0.59, respectively, in Plot 1. However, the overall accuracy and Khat of VF algorithm's model were 0.78 and 0.51, respectively, in Plot 2.

A Method of Automatic Plumbness Measuring for the Semi-umbrella Type Hydraulic Turbine Generator (준우산형 수차발전기의 수직도 자동 측정방법과 그 적용)

  • 김문영;김낙점
    • Journal of KSNVE
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    • v.10 no.4
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    • pp.623-628
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    • 2000
  • This paper presents the automatic plumbness measuring system form improving the accuracy and working time for plumbness measuring of semi-umbrella type hydraulic turbine generator. It is general practice that rotating shaft should run within acceptable vibration limit. In order to obtain more accurate measuring data for single stage shaft on the semi-umbrella type, plumbness approach must be established carefully and accurately. Generally, present plumbness procedure is required several calculation algorithm, laser sensor and data acquisition devices. As a result of application to actual new system it is confirmed that working time could be saved over 80% and accurate measurement data could be acquired.

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Semi-Automatic Segmentation based on Color Information (색상 정보를 이용한 반자동 영상분할 기법)

  • 김민호;최재각;호요성
    • Proceedings of the IEEK Conference
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    • 1999.06a
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    • pp.619-622
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    • 1999
  • This paper describes a new semi-automatic segmentation algorithm based on color information. Semi-automatic segmentation mainly consists of intra-frame segmentation and inter-frame segmentation. While intra-frame segmentation extracts video objects of interest from boundary information provided by the user and intensity information of the image, inter-frame segmentation partitions the image into the video objects and background by tracking the motion of video objects. For inter-frame segmentation, color information (Y, Cb and Cr) of the current frame can be used efficiently in order to find the exact boundary of the video objects. In this paper we propose a new region growing algorithm which can maximize the ability of region differentiation, while preserving features of each color component.

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