• Title/Summary/Keyword: Guidance Line Extraction

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Guidance Line Extraction Algorithm using Central Region Data of Crop for Vision Camera based Autonomous Robot in Paddy Field (비전 카메라 기반의 무논환경 자율주행 로봇을 위한 중심영역 추출 정보를 이용한 주행기준선 추출 알고리즘)

  • Choi, Keun Ha;Han, Sang Kwon;Park, Kwang-Ho;Kim, Kyung-Soo;Kim, Soohyun
    • The Journal of Korea Robotics Society
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    • v.11 no.1
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    • pp.1-8
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    • 2016
  • In this paper, we propose a new algorithm of the guidance line extraction for autonomous agricultural robot based on vision camera in paddy field. It is the important process for guidance line extraction which finds the central point or area of rice row. We are trying to use the central region data of crop that the direction of rice leaves have convergence to central area of rice row in order to improve accuracy of the guidance line. The guidance line is extracted from the intersection points of extended virtual lines using the modified robust regression. The extended virtual lines are represented as the extended line from each segmented straight line created on the edges of the rice plants in the image using the Hough transform. We also have verified an accuracy of the proposed algorithm by experiments in the real wet paddy.

Guidance Line Extraction for Autonomous Weeding robot based-on Rice Morphology Characteristic in Wet Paddy (논 잡초 방제용 자율주행 로봇을 위한 벼의 형태학적 특징 기반의 주행기준선 추출)

  • Choi, Keun Ha;Han, Sang Kwon;Han, Sang Hoon;Park, Kwang-Ho;Kim, Kyung-Soo;Kim, Soohyun
    • The Journal of Korea Robotics Society
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    • v.9 no.3
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    • pp.147-153
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    • 2014
  • In this paper, we proposed a new algorithm of the guidance line extraction for autonomous weeding robot based on infrared vision sensor in wet paddy. It is the critical process for guidance line extraction which finds the central point or area of rice row. In order to improve accuracy of the guidance line, we are trying to use the morphological characteristics of rice that the direction of rice leaves have convergence to central area of rice row. Using Hough transform, we were represented the curved leaves as a combination of segmented straight lines on binary image that has been skeletonized and segmented object. A slope of the guidance line was gotten as calculate the average slope of all segmented lines. An initial point of the guidance line was determined that is the maximum pixel value of the accumulated white columns of a binary image which is rotated the slope of guidance line in the opposite direction. We also have verified an accuracy of the proposed algorithm by experiments in the real wet paddy.

User-Guidable Abstract Line Drawing of 2D Images (사용자 제어가 용이한 이차원 영상의 추상화된 라인 드로잉 생성)

  • Son, Min-Jung;Lee, Yun-Jin;Kang, Hen-Ry;Lee, Seung-Yong
    • Journal of KIISE:Computer Systems and Theory
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    • v.37 no.2
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    • pp.110-125
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    • 2010
  • We present a novel scheme for generating line drawings from 2D images, aiming to facilitate effective visual communication. In contrast to conventional edge detectors, our technique imitates the human line drawing process to generate lines effectively and intuitively. Our technique consists of three parts: line extraction, line rendering, and user guidance. In line extraction, we extract lines by estimating a likelihood function to effectively find the genuine shape boundaries. In line rendering, we consider the feature scale and the blurriness of lines with which the detail and the focus-level of lines are controlled. We also employ stroke textures to provide a variety of illustration styles. User guidance is allowed to modify the shapes and positions of lines interactively, where immediate response is provided by GPU implementation of most line extraction operations. Experimental results demonstrate that our technique generates various kinds of line drawings from 2D images enabled by the control over detail, focus, and style.

Fitness Measurement system using deep learning-based pose recognition (딥러닝 기반 포즈인식을 이용한 체력측정 시스템)

  • Kim, Hyeong-gyun;Hong, Ho-Pyo;Kim, Yong-ho
    • Journal of Digital Convergence
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    • v.18 no.12
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    • pp.97-103
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    • 2020
  • The proposed system is composed of two parts, an AI physical fitness measurement part and an AI physical fitness management part. In the AI fitness measurement part, a guide to physical fitness measurement and accurate calculation of the measured value are performed through deep learning-based pose recognition. Based on these measurements, the AI fitness management part designs personalized exercise programs and provides them to dedicated smart applications. To guide the measurement posture, the posture of the subject to be measured is photographed through a webcam and the skeleton line is extracted. Next, the skeletal line of the learned preparation posture is compared with the extracted skeletal line to determine whether or not it is normal, and voice guidance is provided to maintain the normal posture.

Reinforcing the retention of provisional restoration using provisional implant on maxillary anterior region: clinical case report (상악 전치부 고정성 보철물 수복 시 임시 임플란트를 이용한 임시보철물의 유지력 증가 증례보고)

  • Kim, Chang-Dae;Moon, Hong-Seok;Chung, Moon-Kyu;Lee, Jae-Hoon
    • The Journal of Korean Academy of Prosthodontics
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    • v.51 no.3
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    • pp.221-225
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    • 2013
  • Proper management of provisional prosthesis is key to success in prosthodontics. Provisional restoration on maxillary anterior missing area frequently come across a incident of falling off especially in patients with long span pontics and oval arch shape. This is because maxillary anterior teeth are more exposed to horizontal force than the posterior teeth and additional anterior cantilever effect will negatively affect to the retention of provisional prosthesis. Beside that maxillary anterior provisional prosthesis should provide proper incisal guidance during the mandibular functional movements. However occlusal contacts on the prosthesis in maximum intercuspal position are located on opposite side of fulcrum line of prosthesis which will cause removing force against the provisional prosthesis. This case report present that provisional implant prevent pre-described harmful effect on maxillary anterior fixed provisional prosthesis and provide comfort and satisfactory result during post-extraction healing period.

ORTHODONTIC TREATMENT OF THE DISPLACED UNERUPTED MAXILLARY CANINE : CASE REPORT (변위된 미맹출 상악 견치의 교정 치험례)

  • Lim, Hye-Jeong;Choi, Nam-Ki;Kim, Seon-Mi;Yang, Kyu-Ho
    • Journal of the korean academy of Pediatric Dentistry
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    • v.32 no.3
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    • pp.543-549
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    • 2005
  • The maxillary canine is especially important as it has the longest root, provides guidance for lateral movement of the mandible and masticatory function and is a key in esthetics due to its position. Maxillary canine has the longest time to develop and a complex route from the place of formation to the site of eruption, and so it is prone to impaction more than other teeth. The clinician should consider the various treatment options : (a) No treatment and observation, (b) surgical exposure and orthodontic traction (c) autotransplantation (d) extraction. Surgical exposure of the canine and orthodontic treatment to bring the tooth into the line of occlusion is considered the most desirable approach. This case presents the results of treatment for impacted maxillary canine by surgical exposure and orthodontic tooth movement.

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