• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2013.06a
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• pp.87-89
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• 2013

기존의 영상 라벨러는 이중 스캔 연결 성분 라벨링 방식이 주로 사용되어 왔다. 그러나, 이중 스캔 연결 성분 라벨링 방식은 별도의 라벨 병합 구간 때문에 실시간 처리와 다채널 처리가 어렵다. 최근 단일 스캔 연결 성분 라벨링 방법들이 제안되었지만, 이들 역시 스캔 횟수는 줄일 수 있으나 별도의 라벨 병합 구간을 제거하지는 못하였다. 본 논문에서는 별도의 라벨 병합 구간을 갖지 않는 단일 스캔 연결 성분 라벨러 구조를 제안한다. 제안하는 구조는 라인 스캔과 동시에 라벨 병합이 이루어지기 때문에 고속 동작하고, 예상 가능한 프레임 처리율을 가지며, 다채널 처리가 가능하다. 제안하는 라벨러 구조는 FPGA로 설계되었고 동작이 검증되었으며, 성능 실험을 통해 고속 동작과 다채널 영상 처리에 적합함을 확인하였다.

• 한국공간정보시스템학회:학술대회논문집
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• 2005.05a
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• pp.293-298
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• 2005

LIDAR의 표고점 데이터는 건물, 수목 등의 개체를 구성하는 비지면점과 순수한 지표면을 나타내는 지면점들이 섞여있기 때문에 이들을 분리하는 과정이 필요하다. 지금까지 연구된 방법들은 몇 가지 입력 요소가 필요하여 완전 자동화를 이루지는 못하고 있으며, 다양한 크기의 개체를 동시에 자동으로 찾아내기 어렵고 경사진 지형에 대해서는 적용하기 어려운 문제점을 가지고 있다. 이에 본 논문에서는 원 데이터의 동일 스캔 라인 상에 존재하는 이웃 점들 간의 경사를 이용하여 입력 요소를 최소화하여 개체를 추출하고자 한다. 이웃하는 두 점플 간의 경사를 이용하여 비지면점을 탐지하여 이웃하는 지면점의 높이 값으로 대체하며 갱신된 값을 바로 다음 연산에 반영시킴으로써 윈도우를 사용하거나 그룹화 할 필요가 없다. 또한 갱신된 값을 전파시키기 때문에 복잡한 지붕을 가지는 건물도 추출할 수가 있다. 이와 같은 연산을 두 방향에 대하여 수행하여 경사진 지형에 대하여 적용할 수 있도록 하였으며 천안과 마산지역에 대하여 테스트를 수행하였다.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.855-858
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• 1998

본 연구에서는 MML(merged memory logic)구조를 갖는 스캔라인 컨버터를 설계하여 제안한다. 비월주사 방식인 TV 비디오 신호를 FIFO 메모리에 저장하여 순차주사방식인 VGA 비디오 시모호 변환하는 주사선 변환기를 MML 개념으로 설계하였다. MML 회로는 VHDL로 설계하여 V-system으로 시뮬레이션을 수행하고 altera FPGA에 구현한 후, TV 비디오 신호를 PC 모니터로 보기 위한 외장형 tV 수신 시스템에 적용하여 성능을 검증했다. MML 개념으로 설계된 컨버터는 system-on-a-chip 설계의 첫 단계로 메모리와 로직부분으로 구성된 일반적인 컨버터보다 효율적인 시스템 설계를 할 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.05a
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• pp.805-807
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• 2011

In this paper, we propose a method to inspect defects of injection molded automotive parts. In order to inspect them, we developed and used a line detection algorithm and a defect analysis algorithm. The line detection algorithm defines center point of a laser line and the inspection algorithm determines the defects of automotive parts using pattern data of inspected objects and the data results from the line detection algorithm. We evaluated the accuracy and the processing time of inspection and they showed good performance.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.10
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• pp.2369-2379
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• 2013

A CMOS x-ray line scan sensor which is used in both medical imaging and non-destructive diagnosis is designed. It has a pixel array of 512 columns ${\times}$ 4 rows and a built-in DC-DC converter. The pixel circuit is newly proposed to have three binning modes such as no binning, $2{\times}2$ binning, and $4{\times}4$ binning in order to select one of pixel sizes of $100{\mu}m$, $200{\mu}m$, and $400{\mu}m$. It is designed to output a fully differential image signal which is insensitive to power supply and input common mode noises. The layout size of the designed line scan sensor with a $0.18{\mu}m$ x-ray CMOS image sensor process is $51,304{\mu}m{\times}5,945{\mu}m$.

• Journal of the Korean Society for Precision Engineering
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• v.33 no.6
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• pp.459-467
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• 2016

Using a line scan camera and a Galvano mirror, we constructed a high-speed line-scanning microscope that can generate 2D images ($8000{\times}8000pixels$) without any moving parts. The line scanner consists of a Galvano mirror and a cylindrical lens, which creates a line focus that sweeps over the sample. The measured resolutions in the x (perpendicular to line focus) and y (parallel to line focus) directions are both $2{\mu}m$, with a 2X scan lens and a 3X relay lens. This optical system is useful for measuring defects, such as spalling, chipping, delamination, etc., on the surface of carbon fiber reinforced plastic (CFRP) holes after machining in conjunction with adjustments in the angle of LED lighting. Defects on the inner wall of holes are measured by line confocal laser scanning. This confocal method will be useful for analyzing defects after CFRP machining and for fast 3D image reconstruction.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.10 no.5
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• pp.942-946
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• 2009

A scan order converter has to be placed before the JPEG encoder to provide $8{\times}8$ blocks from the pixels in raster scan order. Recently a hardware architecture has been proposed to implement a scan converter based on the single line memory. Since both read and write accesses happen at each cycle, however, the largest part of the entire power budget is occupied by the SRAM itself. In this paper, the data packing and unpacking procedure is inserted in the processing chain, such that the access frequency to the SRAM is reduced to 1/8 by adopting a packed larger data unit. The simulation results show that the resultant power consumption is reduced down to 16% for the SXGA resolution.

• Journal of the Korean Society for Precision Engineering
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• v.16 no.12
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• pp.60-70
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• 1999

An efficient automatic inspection system for Floating Seal is developed, The proposed system consists of a high resolution line scan camera, microcomputer, and PLC (Programmable Logic Controller). In order to perform rapid inspection, The ROI (Region of Interest) is extracted from the original image. There are types of defects; shape defects and surface defects. Each features of defects are captured by edge detect, segmentation, morphological operation, and threshold analysis. PLC controller is used to synchronize the whole system and store the inspection results temporarily to reduce the overhead of microcomputer. As a result, the system is being utilized successfully in a teal inspection line.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.4
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• pp.69-74
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• 2004

In this paper, we propose a novel method for improving defect-detection performance based on reconstruction of line-scan camera images using both the projection profiles and color space transform. The proposed method consists of RGB region segmentation, representative value reconstruction using the tracing system, and Y image reconstruction using color-space transformation. Through experiments it is demonstrated that the performance using the reconstructed image is better than that using aerial image for LCD surface inspection.

• Journal of Practical Engineering Education
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• v.6 no.1
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• pp.37-42
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• 2014

The automated visual inspection system (machine vision system) for quality assurance is important factory automation equipment in the manufacturing industries, such as display, semiconductor, etc. There is a lot of demand for the machine vision engineers. However, there are no technical training courses for machine vision technologies in vocational schools, colleges and universities. In this paper, we present the implementation of line scan camera based equipment for technical training of the automated visual inspection system. The training system consists of the X-Y stage which is widely used in machine vision industries and its variable image resolution are set to $10-30{\mu}m$. Additionally, this training system can attach the industrial illumination, either the direct illuminator or coaxial illuminator, for verifying the effect of illuminations. This means that the trainee can have a practical training in various equipment conditions and the training system is similar to the automated visual inspection system in industries.