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Outdoor travel-aids using bird-eye view virtual camera

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Journal of Measurement Science and Instrumentation 2012年第3期3卷 219-223页

作者： hernsoo hahn Youngjoon Han Dept.of Electronic Engineering Soongsil University

This paper presents a travel-aid system for sight-impaired pedestrians in outdoor environment.Unlike many existing travel-aid systems that rely on stereo-vision,the proposed system aims to detect generic obstacles in a cluttered road environment by using just the single camera attached to user's body.To achieve this goal,the original image is re-sampled and mapped to a bird-eye view virtual plane,on which background edges are sub-sampled while obstacle edges are oversampled.Morphology filters with connected component analysis are used to enhance obstacle edges as edge-blobs with larger size,whereas sparse edges from background are filtered out.Based on the identified obstacles,safe walking areas are estimated by calculating a polar edge histogram.The algorithm is tested in different sidewalk scenes with complex pavements,and its efficiency has been confirmed.

关键词： travel-aids monocular vision bird-eye view re-sampling polar edge histogram

Improved color feature arrangement for mean shift tracking

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Journal of Measurement Science and Instrumentation 2013年第1期4卷 38-42页

作者： Xiaowei An Youngjoon Han hernsoo hahn Dept.of Electronic Engineering Soongsil UniversitySeoul 156-743Korea

In order to reduce redundant empty bin capacity in the probability representation,we present a new color feature arrangement mechanism for mean shift tracking objects.In the proposed mechanism,the important optimal color,or we call it optimal color vector,is clustered by closing Euclidean distance which happens inside the original RGB color 3-D spatial domain.After obtaining clustering colors from the reference image RGB spatial domain,novel clustering groups substitute for original color data.So the new color substitution distribution is as similar as the original one.And then target region in the candidate frame is mapped by the constructed optimal clustering colors and the cluster Indices.In the final,mean shift algorithm gives a performance in the new optimal color distribution.Comparison under the same circumstance between the proposed algorithm and conventional mean shift algorithm shows that the former has a certain advantage in computation cost.

关键词： color feature arrangement optimal color vector cluster redundant bin

Bounding box based on probability density for the pedestrian tracking

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Journal of Measurement Science and Instrumentation 2012年第4期3卷 333-335页

作者： Jaehyun So hernsoo hahn Youngjun Han Dept.of Electronic Engineering Soongsil University

This paper proposes a pedestrian tracking approach using bounding box based on probability densities.It is generally a difficult task to track features like corner points in outdoor images due to complex environment.To solve this problem,the feature points are projected along X and Y direction separately,and a histogram is constructed for each projection,with horizontal axis as positions and vertical axis as the number of feature points that lie on each position.Finally,the vertical axis is normalized for expression as probability.After histogram is constructed,the probability of each feature point is checked with a threshold.A feature point will be ignored if its probability is lower than a threshold,while the remaining feature points are grouped,based on which a bounding box is made.Kanade-Lucas Tomasi(KLT)algorithm is adopted as the tracking algorithm because it is able to track local features in images robustly.The efficiency of the tracking results using this method is verified in real environment test.

关键词：自动化系统数据处理数据收集自动分类

Lane Detection Based on Contrast Improvement in Foggy Road Image

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Journal of Measurement Science and Instrumentation 2010年第S1期1卷 164-167,172页

作者： Youngtak Kim Namki Lee Jaehyoung Yu hernsoo hahn Dept.of Electronic Engineering Soongsil University

This paper proposes a lane detection algorithm using sub stretching of histogram.First of all,makes a decision whether the image has foggy or not.For this,sets the interest region and analyzes the histogram of the region. If the image has a fog,applies a contrast enhancement algorithm using sub-stretching of histogram.In order to detect lane information,uses connectivity of edge pixels of road image and finds the straight lines forward to the center of image.To evaluate the performance of proposed algorithm,tested the algorithm on the road image obtained by a driving test and verified its efficiency.

关键词： Lane detection Fog judgmen Contrast enhancement

Facial model fitting algorithm based on active appearance model

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Journal of Measurement Science and Instrumentation 2012年第4期3卷 323-327页

作者： LI Lu-ning hernsoo hahn Youngjoon Han Dept.of Engineering and Electronics Soongsil University

Active appearance model(AAM)is an efficient method for the localization of facial feature points,which is also useful for the subsequent work such as face detection and facial expression recognition.In this paper,we mainly discuss the AAMs based on principal component analysis(PCA).We also propose an efficient facial fitting algorithm,which is named inverse compositional image alignment(ICIA),to eliminate a considerable amount of computation resulting from traditional gradient descent fitting algorithm.Finally,3D facial curvature is used to initialize the location of facial feature,which helps select the parameters of initial state for the improved AAM.

关键词：自动化系统数据处理数据收集自动分类