• Title/Summary/Keyword: Line scan image

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Design of High-Speed Image Processing System for Line-Scan Camera (라인 스캔 카메라를 위한 고속 영상 처리 시스템 설계)

  • 이운근;백광렬;조석빈
    • Journal of Institute of Control, Robotics and Systems
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    • v.10 no.2
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    • pp.178-184
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    • 2004
  • In this paper, we designed an image processing system for the high speed line-scan camera which adopts the new memory model we proposed. As a resolution and a data rate of the line-scan camera are becoming higher, the faster image processing systems are needed. But many conventional systems are not sufficient to process the image data from the line-scan camera during a very short time. We designed the memory controller which eliminates the time for transferring image data from the line-scan camera to the main memory with high-speed SRAM and has a dual-port configuration therefore the DSP can access the main memory even though the memory controller are writing the image data. The memory controller is implemented by VHDL and Xilinx SPARTAN-IIE FPGA.

Constructing a Automatic Real-time Line-Scan Inspection System (실시간 자동 검사를 위한 라인 스캔 컴퓨터 비전 시스템의 연구)

  • Jang, Dong-Sik;Kim, Yong-Deok
    • IE interfaces
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    • v.9 no.1
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    • pp.73-82
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    • 1996
  • The purpose of this research is to construct real-time image acquisition system for a line-scan inspection system as a computer vision system. To construct the line-scan inspection system, many problem arise. However, problems of image acquisitions using linear CCD are practically studied in this paper. These problems are concerned to proper lighting systems, relations with handling system, camera systems, and impacts due to the noise of environment. These problems are examined separately, and proper configurations for each case are suggested to construct the line-scan image acquisition system.

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Precision Measurement using Scan-line image Segmentation Method (스캔라인 영상분할기법에 의한 정밀도 측정에 관한 연구)

  • Park, Jung-Su;Youn, Jae-Woong;Jung, Won
    • Journal of Korea Society of Industrial Information Systems
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    • v.7 no.4
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    • pp.29-36
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    • 2002
  • In this paper, a new edge detection method for area images is presented based on the scan-line image segmentation technology. The existing algorithms are lack of precision in its detections due to the noise factors such as depth perception and illumination problems when processing the 3D image into a 2D image. The general process of applying the scan-line method is to extract straight line components to determine the shape of the objects. However, we implement this method to an arc curve for precise detections. the paper proved precise detections that from off line to on line.

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Investigation on Grain Image Visulalization and Color Sorting Technique (색채선별기 곡물 이미지 가시화 및 선별기법에 관한 연구)

  • Lee, Choon-Young;Yan, Lei;Lee, Sang-Ryong;Par, Cheol-Woo
    • Journal of the Korean Society of Visualization
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    • v.6 no.2
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    • pp.20-27
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    • 2008
  • The color sorting technique utilizing the image processing method is very applicable tool to analyze motion of a free-falling object in many agricultural and industrial research fields. In the present study, we have developed an image processing system and algorithm to sort good quality rice grains effectively from the bad ones. The system employs a high speed rate line-scan CCD camera with 2K-pixels and worked with a high speed DSP and FPGA in-line. It can accumulate acquired line-scan image data and visualize each grain image clearly. As a result, we can easily calculate the number of pixels occupied by grain(=grain size), gray level and its correct position by visualizing grain images rapidly.

Design and Simulation of Edge Painting Machine for Image Rasterization (Image rasterization을 위한 Edge Painting Machine의 설계 및 simulation)

  • Choi, Sang-Gil;Kim, Sung-Soo;Eo, Kil-Su;Kyung, Chong-Min
    • Proceedings of the KIEE Conference
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    • 1987.07b
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    • pp.1492-1494
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    • 1987
  • This paper describes a hardware architecture called Edge Painting Machine for real time generation of scan line images for raster scan graphics display. The Edge Painting Machine consists of Scanline Processor which converts polygon data sorted in their depth priority into a set of scan line commands for each scan line, and Edge Painting Tree which converts the scanline commands set into a raster line image. Edge painting tree has been designed using combinational logic circuit. The designed circuit has been simulated to verify the proper functioning. A salient feature of the EPT is that hardware composition is simple, because each processor is constituted by only combinational logic circuit.

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Measurements of Defects after Machining CFRP Holes Using High Speed Line Scan (고속 라인 스캔 방식을 이용한 CFRP 가공 홀 표면 및 내부 결함 검사)

  • Kim, Teaggyum;Kyung, Daesu;Son, Unchul;Park, Sun-Young
    • 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.

Image Reconstruction Using Line-scan Image for LCD Surface Inspection (LCD표면 검사를 위한 라인스캔 영상의 재구성)

  • 고민석;김우섭;송영철;최두현;박길흠
    • 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.

A Study on the Control Characteristics of Line Scan Light Source for Machine Vision Line Scan Camera (머신 비전 라인 스캔 카메라를 위한 라인 스캔 광원의 제어 특성에 관한 연구)

  • Kim, Tae-Hwa;Lee, Cheon
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.34 no.5
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    • pp.371-381
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    • 2021
  • A machine vision inspection system consists of a camera, optics, illumination, and image acquisition system. Especially a scanning system has to be made to measure a large inspection area. Therefore, a machine vision line scan camera needs a line scan light source. A line scan light source should have a high light intensity and a uniform intensity distribution. In this paper, an offset calibration and slope calibration methods are introduced to obtain a uniform light intensity profile. Offset calibration method is to remove the deviation of light intensity among channels through adding intensity difference. Slope calibration is to remove variation of light intensity slope according to the control step among channels through multiplying slope difference. We can obtain an improved light intensity profile through applying offset and slope calibration simultaneously. The proposed method can help to obtain clearer image with a high precision in a machine vision inspection system.

A Stereo Matching Technique using Multi-directional Scan-line Optimization and Reliability-based Hole-filling (다중방향성 정합선 최적화와 신뢰도 기반 공백복원을 이용한 스테레오 정합)

  • Baek, Seung-Hae;Park, Soon-Young
    • The KIPS Transactions:PartB
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    • v.17B no.2
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    • pp.115-124
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    • 2010
  • Stereo matching techniques are categorized in two major schemes, local and global matching techniques. In global matching schemes, several investigations are introduced, where cost accumulation is performed in multiple matching lines. In this paper, we introduce a new multi-line stereo matching techniques which expands a conventional single-line matching scheme to multiple one. Matching cost is based on simple normalized cross correlation. We expand the scan-line optimization technique to a multi-line scan-line optimization technique. The proposed technique first generates a reliability image, which is iteratively updated based on the previous reliability measure. After some number of iterations, the reliability image is completed by a hole-filling algorithm. The hole-filling algorithm introduces a disparity score table which records the disparity score of the current pixel. The disparity of an empty pixel is determined by comparing the scores of the neighboring pixels. The proposed technique is tested using the Middlebury and CMU stereo images. The error analysis shows that the proposed matching technique yields better performance than using conventional global matching algorithm.