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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.
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.
현종길(Jongkil Hyun),이인규(Ingyu Lee),문병인(Byungin Moon) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.2
Stereo vision is a technique of extracting disparities from a stereo image pair and calculating three-dimensional distance information. Stereo vision is an active research field because it can be used in various applications. Most studies of stereo vision have been focusing on the matching process and paying little attention to the post-processing process which plays a significant role in improving disparity accuracy. Thus, this paper divides the post-processing algorithms into three groups and evaluates and analyzes their performance. According to the experimental results, the left-right consistency check shows the best performance compared with other seed pixel detection methods, the 2-way interpolation method is more efficient than the 1-way interpolation method, and the weight median filter shows outstanding performance to improve disparity accuracy while preserving edge information of disparity maps.
Toxoflavin lyase enzyme as a marker for selecting potato plant transformants.
Kim, Mi-Sun,Kim, HyunSoon,Moon, Jae Sun,Hwang, Ingyu,Joung, Hyouk,Jeon, Jae-Heung Japan Society for Bioscience, Biotechnology, and A 2012 Bioscience, biotechnology, and biochemistry Vol.76 No.12
<P>This study established a new system for potato transformation using toxoflavin as selection agent and toxoflavin lyase (tflA) as selectable marker gene. Potato plants expressing tflA was successfully transformed on toxoflavin medium with 27% efficiency, similar to that for the hygromycin/hpt selection system. The transgenic potato expressing tflA also showed resistance to Burkholderia glumea infection.</P>
Cyst formation in kidney via B-Raf signaling in the PKD2 transgenic mice.
Park, Eun Young,Sung, Young Hoon,Yang, Moon Hee,Noh, Ji Yeun,Park, So Young,Lee, Tae Young,Yook, Yeon Joo,Yoo, Kyung Hyun,Roh, Kyung Jin,Kim, Ingyu,Hwang, Young-Hwan,Oh, Goo Taeg,Seong, Je Kyung,Ahn, American Society for Biochemistry and Molecular Bi 2009 The Journal of biological chemistry Vol.284 No.11
<P>The pathogenic mechanisms of human autosomal dominant polycystic kidney disease (ADPKD) have been well known to include the mutational inactivation of PKD2. Although haploinsufficiency and loss of heterozygosity at the Pkd2 locus can cause cyst formation in mice, polycystin-2 is frequently expressed in the renal cyst of human ADPKD, raising the possibility that deregulated activation of PKD2 may be associated with the cystogenesis of human ADPKD. To determine whether increased PKD2 expression is physiologically pathogenic, we generated PKD2-overexpressing transgenic mice. These mice developed typical renal cysts and an increase of proliferation and apoptosis, which are reflective of the human ADPKD phenotype. These manifestations were first observed at six months, and progressed with age. In addition, we found that ERK activation was induced by PKD2 overexpression via B-Raf signaling, providing a possible molecular mechanism of cystogenesis. In PKD2 transgenic mice, B-Raf/MEK/ERK sequential signaling was up-regulated. Additionally, the transgenic human polycystin-2 partially rescues the lethality of Pkd2 knock-out mice and therefore demonstrates that the transgene generated a functional product. Functional strengthening or deregulated activation of PKD2 may be a direct cause of ADPKD. The present study provides evidence for an in vivo role of overexpressed PKD2 in cyst formation. This transgenic mouse model should provide new insights into the pathogenic mechanism of human ADPKD.</P>
Pyrroloquinoline quinone is a plant growth promotion factor produced by Pseudomonas fluorescens B16.
Choi, Okhee,Kim, Jinwoo,Kim, Jung-Gun,Jeong, Yeonhwa,Moon, Jae Sun,Park, Chang Seuk,Hwang, Ingyu American Society of Plant Physiologists 2008 Plant Physiology Vol.146 No.2
<P>Pseudomonas fluorescens B16 is a plant growth-promoting rhizobacterium. To determine the factors involved in plant growth promotion by this organism, we mutagenized wild-type strain B16 using OmegaKm elements and isolated one mutant, K818, which is defective in plant growth promotion, in a rockwool culture system. A cosmid clone, pOK40, which complements the mutant K818, was isolated from a genomic library of the parent strain. Tn3-gusA mutagenesis of pOK40 revealed that the genes responsible for plant growth promotion reside in a 13.3-kb BamHI fragment. Analysis of the DNA sequence of the fragment identified 11 putative open reading frames, consisting of seven known and four previously unidentified pyrroloquinoline quinone (PQQ) biosynthetic genes. All of the pqq genes showed expression only in nutrient-limiting conditions in a PqqH-dependent manner. Electrospray ionization-mass spectrometry analysis of culture filtrates confirmed that wild-type B16 produces PQQ, whereas mutants defective in plant growth promotion do not. Application of wild-type B16 on tomato (Solanum lycopersicum) plants cultivated in a hydroponic culture system significantly increased the height, flower number, fruit number, and total fruit weight, whereas none of the strains that did not produce PQQ promoted tomato growth. Furthermore, 5 to 1,000 nm of synthetic PQQ conferred a significant increase in the fresh weight of cucumber (Cucumis sativus) seedlings, confirming that PQQ is a plant growth promotion factor. Treatment of cucumber leaf discs with PQQ and wild-type B16 resulted in the scavenging of reactive oxygen species and hydrogen peroxide, suggesting that PQQ acts as an antioxidant in plants.</P>
Chun, Heejin,Choi, Okhee,Goo, Eunhye,Kim, Nayeon,Kim, Hongsup,Kang, Yongsung,Kim, Jinwoo,Moon, Jae Sun,Hwang, Ingyu American Society for Microbiology 2009 Journal of Bacteriology Vol.191 No.13
<B>ABSTRACT</B><P>Quorum sensing (QS) plays important roles in the pathogenicity of <I>Burkholderia glumae</I>, the causative agent of bacterial rice grain rot. We determined how QS is involved in catalase expression in <I>B. glumae</I>. The QS-defective mutant of <I>B. glumae</I> exhibited less catalase activity than wild-type <I>B. glumae</I>. A β-glucuronidase assay of a <I>katG</I>::Tn<I>3-gusA78</I> reporter fusion protein revealed that <I>katG</I> expression is under the control of QS. Furthermore, <I>katG</I> expression was upregulated by QsmR, a transcriptional activator for flagellar-gene expression that is regulated by QS. A gel mobility shift assay confirmed that QsmR directly activates <I>katG</I> expression. The <I>katG</I> mutant produced toxoflavin but exhibited less severe disease than BGR1 on rice panicles. Under visible light conditions and a photon flux density of 61.6 μmol<SUP>−1</SUP> m<SUP>−2</SUP>, the survival rate of the <I>katG</I> mutant was 10<SUP>5</SUP>-fold lower than that of BGR1. This suggests that KatG is a major catalase that protects bacterial cells from visible light, which probably results in less severe disease caused by the <I>katG</I> mutant.</P>