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An Improved Stereo Matching Algorithm with Robustness to Noise Based on Adaptive Support Weight
( Ingyu Lee ),( Byungin Moon ) 한국정보처리학회 2017 Journal of information processing systems Vol.13 No.2
An active research area in computer vision, stereo matching is aimed at obtaining three-dimensional (3D) information from a stereo image pair captured by a stereo camera. To extract accurate 3D information, a number of studies have examined stereo matching algorithms that employ adaptive support weight. Among them, the adaptive census transform (ACT) algorithm has yielded a relatively strong matching capability. The drawbacks of the ACT, however, are that it produces low matching accuracy at the border of an object and is vulnerable to noise. To mitigate these drawbacks, this paper proposes and analyzes the features of an improved stereo matching algorithm that not only enhances matching accuracy but also is also robust to noise. The proposed algorithm, based on the ACT, adopts the truncated absolute difference and the multiple sparse windows method. The experimental results show that compared to the ACT, the proposed algorithm reduces the average error rate of depth maps on Middlebury dataset images by as much as 2% and that is has a strong robustness to noise.
Lee, Ingyu,Yoon, Jungsoo,Park, Gujeong,Yoon, Youngbin The Korean Society for Aeronautical and Space Scie 2014 International Journal of Aeronautical and Space Sc Vol.15 No.4
A throttleable rocket engine enables operational possibilities such as the docking of spacecraft, maneuvering in a certain orbit and landing on a planet's surface, altitude control, and entrance to atmosphere-less planets. Thus, throttling methods have long been researched. However, dual-manifold injectors, which represent one throttling method, have been investigated less than others. In this study, dual-manifold and single-manifold injectors were compared to determine the characteristics of dual-manifold injectors. Also, the effects of gas injection were investigated with various F/O ratios. To investigate the characteristics, mass flow rate, spray pattern, spray angle, and droplet size were measured. The spray angle and droplet size were captured by indirect photography. About 30 images were taken to assess the spray patterns and spray angle. Also, 700 images were analyzed to understand the droplet distribution and targeting area, moving to the right from the centerline with 1.11-cm intervals. The droplet size was obtained from an image processing procedure. From the results, the spray angle showed two transition regions, due to swirl momentum in the swirl chamber regardless of the F/O ratio. The droplet size showed similar trends in both dual-manifold and single-manifold injectors except in the low mass flow rate region. In the case of the dual- manifold injector, the spray cone was not fully developed in the low mass flow rate region due to low angular momentum in the swirl chamber.
An Improved Stereo Matching Algorithm with Robustness to Noise Based on Adaptive Support Weight
Lee, Ingyu,Moon, Byungin Korea Information Processing Society 2017 Journal of information processing systems Vol.13 No.2
An active research area in computer vision, stereo matching is aimed at obtaining three-dimensional (3D) information from a stereo image pair captured by a stereo camera. To extract accurate 3D information, a number of studies have examined stereo matching algorithms that employ adaptive support weight. Among them, the adaptive census transform (ACT) algorithm has yielded a relatively strong matching capability. The drawbacks of the ACT, however, are that it produces low matching accuracy at the border of an object and is vulnerable to noise. To mitigate these drawbacks, this paper proposes and analyzes the features of an improved stereo matching algorithm that not only enhances matching accuracy but also is also robust to noise. The proposed algorithm, based on the ACT, adopts the truncated absolute difference and the multiple sparse windows method. The experimental results show that compared to the ACT, the proposed algorithm reduces the average error rate of depth maps on Middlebury dataset images by as much as 2% and that is has a strong robustness to noise.
Drug-induced Hyperprolactinemia Results in Atypical Atypical Fracture
( Ingyu Lee ),( Dong-wook Son ),( Jun Hyoung Park ),( Jai Hyung Park ) 대한고관절학회 2021 Hip and Pelvis Vol.33 No.2
We report a case of bilateral femur fracture which may have resulted in part from long-term administration of antipsychotic agents. A 43-year-old female patient with pain in both thighs visited our clinic. We conducted X-ray and magnetic resonance imaging (MRI) examinations which revealed bilateral femur fractures. The right proximal femur had a complete fracture, and the left proximal femur had an incomplete fracture, both of which were in the subtrochanteric area. The patient was treated by intramedullary nailing in the right femur. Laboratory analysis showed hyperprolactinemia and hypogonadism. Bone mineral density analysis showed osteoporosis. Antipsychotic drug-induced hyperprolactinemia is a well-known phenomenon. Despite concerns about hyperprolactinemia induced osteoporotic fracture in patients treated with only prolactin-elevating medications, the issue has not been extensively studied. If hyperprolactinemia patients suffer from uncontrolled pain, we recommend MRI examination as surgeons should be aware of the possibility of osteoporotic fracture induced by hyperprolactinemia.
Lee Jaewook,Ahn Jin Hwan,Lee Ingyu,Cho Yongun 대한정형외과 스포츠의학회 2020 Arthroscopy and Orthopedic Sports Medicine Vol.7 No.1
We report a case of pathologic bilateral impingement of the posterior cruciate ligament (PCL) synovial folds referred to PCL plicae. A 40-year-old female was admitted to the hospital with vague bilateral knee pain along the medial side of both knees just below each patella. She reported that standing for long periods of time increased the pain and that it has been more than 10 years since the vague pain occurred. On magnetic resonance imaging, medial synovial folds of the PCL were identified and therefore knee arthroscopy was performed under general anesthesia. The arthroscopic findings revelated entrapped folds within the medial tibiofemoral joints when the knees were in passive extension. The entrapped tissue of the synovial folds was resected by punch forceps and debrided by a shaver. After eight months of surgery, the patient’s symptoms completely resolved, and she regained full range of motion. The long medial synovial folds around the PCL can be a cause of knee pain due to entrapment between the femoral and tibial condyles. Plicae pathologies can therefore be considered one of the differential diagnosis of vague knee pain.
Ingyu Lee,Jungsoo Yoon,Gujeong Park,Youngbin Yoon 한국항공우주학회 2014 International Journal of Aeronautical and Space Sc Vol.15 No.4
A throttleable rocket engine enables operational possibilities such as the docking of spacecraft, maneuvering in a certain orbit and landing on a planet’s surface, altitude control, and entrance to atmosphere-less planets. Thus, throttling methods have long been researched. However, dual-manifold injectors, which represent one throttling method, have been investigated less than others. In this study, dual-manifold and single-manifold injectors were compared to determine the characteristics of dual manifold injectors. Also, the effects of gas injection were investigated with various F/O ratios. To investigate the characteristics, mass flow rate, spray pattern, spray angle, and droplet size were measured. The spray angle and droplet size were captured by indirect photography. About 30 images were taken to assess the spray patterns and spray angle. Also, 700 images were analyzed to understand the droplet distribution and targeting area, moving to the right from the centerline with 1.11-㎝ intervals. The droplet size was obtained from an image processing procedure. From the results, the spray angle showed two transition regions, due to swirl momentum in the swirl chamber regardless of the F/O ratio. The droplet size showed similar trends in both dual-manifold and single-manifold injectors except in the low mass flow rate region. In the case of the dual- manifold injector, the spray cone was not fully developed in the low mass flow rate region due to low angular momentum in the swirl chamber.
이동통신단말기의 소프트웨어를 위한 사용성 지표개발과 검정방안에 관한 연구
이성혜(Lee Seonghye),김인규(Kim Ingyu),이태희(Lee Teahee) 한국디지털디자인학회 2008 디지털디자인학연구 Vol.8 No.3
이동통신 단말기의 사용자 만족도를 결정하는데 중요한 요소인 소프트웨어의 사용성을 향상시킬 수 있는 방법론을 개발하는 것은 중요한 연구주제이다. 일반적으로 이동통신 단말기의 사용성은 설문조사를 통해 얻지만 이를 활용해서 재품개발에 반영하는 방안은 제시되지 못했다. 본 연구에서는 사용성에 영향을 미치는 속성과 속성별 가중치를 추출하기 위한 방법론을 제시하고 이 방법을 통해 추출된 결과가 지금까지의 설문조사를 통해 구해진 사용성 만족도와 관계가 근접함을 보였다. 본 연구에서 제안한 방법론을 통해서 추출된 속성과 속성별 가중치를 활용하면 만족도가 높은 이동통신 단말기제품의 소프트웨어를 개발할 수 있도록 구체적인 가이드라인을 제시할 수 있음을 보였다. Developing a methodology that improves software usability which is an important factor of customer satisfaction index of handheld mobile devices is an important research theme. In general customer satisfaction index of handheld mobile devices can be obtained through survey. However methods to apply the results in developing better products has not been proposed. In this paper we propose a methodology that extracts attributes and their weights of usability satisfaction index for softwares of handheld mobile devices. We showed that the resulting software usability of our methodology are closely related to the original one. We also showed that attributes and their weights of usability satisfaction index extracted using the proposed methodology can give guidelines in developing handheld mobile devices with higher consumer satisfaction.