• Title/Summary/Keyword: Line-ScanCamera

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Real-time Object Tracking using Adaptive Background Image in Video (동영상에서 적응적 배경영상을 이용한 실시간 객체 추적)

  • 최내원;지정규
    • Journal of Korea Multimedia Society
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    • v.6 no.3
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    • pp.409-418
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    • 2003
  • Object tracking in video is one of subject that computer vision and several practical application field have interest in several years. This paper proposes real time object tracking and face region extraction method that can be applied to security and supervisory system field. For this, in limited environment that camera is fixed and there is seldom change of background image, proposed method detects position of object and traces motion using difference between input image and background image. The system creates adaptive background image and extracts pixels in object using line scan method for more stable object extraction. The real time object tracking is possible through establishment of MBR(Minimum Bounding Rectangle) using extracted pixels. Also, effectiveness for security and supervisory system is improved due to extract face region in established MBR. And through an experiment, the system shows fast real time object tracking under limited environment.

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Monitoring system for grain sorting using embedded Linux-based servers and Web applications (임베디드 리눅스 기반의 서버와 웹 어플리케이션을 이용한 곡물 선별 모니터링 시스템)

  • Park, Se-hyun;Geum, Young-wook;Kim, Hyun-jae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.20 no.12
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    • pp.2341-2347
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    • 2016
  • In this paper, we implement monitoring system for grain sorting using a high-speed FPGA and embedded LINUX. The proposed system is designed by base on web server and web-based applications while existing system was designed by base on stand-alone mode.The interface the Web server with high speed hardware of FPGA is designed on the implemented monitoring system. The proposed system has the advantages of multi-tasking on Linux web server and real-time high speed on FPGA also. The control logic of a high speed rate line-scan CCD camera, the method of center of gravity, HSL decoding and the interface on the Web server are implemented in FPGA. The implemented monitoring system has the advantage of being able to control the grain monitoring, system failure and recovery remotely by web application. As a result, we can upgrade the performance of sorting quality compared by existing system.

Availability evaluation of automatic inspection equipment using line scan camera for concrete lining (라인스캔 카메라를 이용한 콘크리트 라이닝 자동점검진단 장비 활용성 평가)

  • Lee, Gyu-Phil;Lim, Hyung-Joon;Kim, Jeong-Heum
    • Journal of Korean Tunnelling and Underground Space Association
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    • v.22 no.6
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    • pp.643-653
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    • 2020
  • The concrete lining inspection by inspector after traffic control poses various problems such as congestion caused by traffic control and social loss costs resulting from it, and risks of traffic accidents and safety accidents for inspectors et al. To solve the problems, the concrete lining inspection has been carried out using automatic inspection equipment and image analysis that can be objectively and quantitatively investigated in overseas. In this study, to solve the problems of concrete lining inspection by inspector and to review improvement plan for inspection, inspection was carried out using automatic inspection equipment for ◯◯ tunnel that precision safety diagnosis has been conducted in 2019. Analysis was carried out for both inspection results. Automatic inspection equipment investigated defects in concrete lining such as cracks more accurately than precision safety diagnosis.

A Real-time Copper Foil Inspection System using Multi-thread (다중 스레드를 이용한 실시간 동판 검사 시스템)

  • Lee Chae-Kwang;Choi Dong-Hyuk
    • Journal of KIISE:Computing Practices and Letters
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    • v.10 no.6
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    • pp.499-506
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    • 2004
  • The copper foil surface inspection system is necessary for the factory automation and product quality. The developed system is composed of the high speed line scan camera, the image capture board and the processing computer. For the system resource utilization and real-time processing, multi-threaded architecture is introduced. There are one image capture thread, 2 or more defect detection threads, and one defect communication thread. To process the high-speed input image data, the I/O overlap is used through the double buffering. The defect is first detected by the predetermined threshold. To cope with the light irregularity, the compensation process is applied. After defect detection, defect type is classified with the defect width, eigenvalue ratio of the defect covariance matrix and gray level of defect. In experiment, for high-speed input image data, real-time processing is possible with multi -threaded architecture, and the 89.4% of the total 141 defects correctly classified.

Usefulness of Xact-bone for the Resolution Advancement of Gamma Camera Image (감마카메라 영상에서 분해능 향상을 위한 Xact-bone의 유용성 평가)

  • Kim, Jong-Pil;Yoon, Seok-Hwan;Lim, Jung-Jin;Woo, Jae-Ryong
    • The Korean Journal of Nuclear Medicine Technology
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    • v.15 no.2
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    • pp.30-35
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    • 2011
  • Purpose: The Boramae Hospital are currently using Wide beam reconstruction (WBR: UltraSPECT, Israel) to improve the resolution. The Xact-bone belongs to the WBR. It has been reported that Xact-bone helps us to improve image resolution and contrast. This study will be evaluated clinical usefulness of Xact-bone method. Materials and Methods: The usefulness evaluation of Xact-bone method was analyzed in resolution test and contrast ratio. The resolution test in Planar image were obtained from Full width at half maximum (FWHM) by using capillary tube. And the contrast ratio was obtained from Bone and Soft tissue (B/S) ratio values that were acquired from bone scan study of 50 patients before and after using the Xact-bone method. We prepared the Triple Line Source Phantom, NEMA IEC Body Phantom and Standard Jaszczak Phantom to acquire the FWHM and Contrast Ratio values of Single photon emission computed tomography (SPECT) image. Subsequently we compared among the Filtered backprojection (FBP), Orderd subset expectation maximization (OSEM) and Xact-Bone image. Results: The results of the planar Xact-bone data improved resolution about 20% by using capillary tube. In addition it was improved B/S ratio about 15%. When using Triple Line Source Phantom, SPECT Xact-bone data improved resolution for both FBP, OSEM methods about 20% and 10%, respectively. Contrast ratio in each spheres has also been increased for both methods that using NEMA IEC body Phantom and Standard Jaszczak Phantom. Conclusion: When we were using Xact-bone method, we could see to improve the resolution and Contrast ratio as compared to do not use the Xact-bone method. Accordingly, by using WBR's Xact-bone method is expected to improve the image quality. However, when introducing new software, it is needed to match the characteristics of the hospital protocol and clinical application.

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Minimization of Motion Blur and Dynamic MTF Analysis in the Electro-Optical TDI CMOS Camera on a Satellite (TDI CMOS 센서를 이용한 인공위성 탑재용 전자광학 카메라의 Motion Blur 최소화 방법 및 Dynamic MTF 성능 분석)

  • Heo, HaengPal;Ra, SungWoong
    • Korean Journal of Remote Sensing
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    • v.31 no.2
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    • pp.85-99
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    • 2015
  • TDI CCD sensors are being used for most of the electro-optical camera mounted on the low earth orbit satellite to meet high performance requirements such as SNR and MTF. However, the CMOS sensors which have a lot of implementation advantages over the CCD, are being upgraded to have the TDI function. A few methods for improving the issue of motion blur which is apparent in the CMOS sensor than the CCD sensor, are being introduced. Each pixel can be divided into a few sub-pixels to be read more than once as is the same case with three or four phased CCDs. The fill factor can be reduced intentionally or even a kind of mask can also be implemented at the edge of pixels to reduce the blur. The motion blur can also be reduced in the TDI CMOS sensor by reducing the integration time from the full line scan time. Because the integration time can be controlled easily by the versatile control electronics, one of two performance parameters, MTF and SNR, can be concentrated dynamically depending on the aim of target imaging. MATLAB simulation has been performed and the results are presented in this paper. The goal of the simulation is to compare dynamic MTFs affected by the different methods for reducing the motion blur in the TDI CMOS sensor.

The Development of Image Processing System Using Area Camera for Feeding Lumber (영역카메라를 이용한 이송중인 제재목의 화상처리시스템 개발)

  • Kim, Byung Nam;Lee, Hyoung Woo;Kim, Kwang Mo
    • Journal of the Korean Wood Science and Technology
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    • v.37 no.1
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    • pp.37-47
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    • 2009
  • For the inspection of wood, machine vision is the most common automated inspection method used at present. It is required to sort wood products by grade and to locate surface defects prior to cut-up. Many different sensing methods have been applied to inspection of wood including optical, ultrasonic, X-ray sensing in the wood industry. Nowadays the scanning system mainly employs CCD line-scan camera to meet the needs of accurate detection of lumber defects and real-time image processing. But this system needs exact feeding system and low deviation of lumber thickness. In this study low cost CCD area sensor was used for the development of image processing system for lumber being fed. When domestic red pine being fed on the conveyer belt, lumber images of irregular term of captured area were acquired because belt conveyor slipped between belt and roller. To overcome incorrect image merging by the unstable feeding speed of belt conveyor, it was applied template matching algorithm which was a measure of the similarity between the pattern of current image and the next one. Feeding the lumber over 13.8 m/min, general area sensor generates unreadable image pattern by the motion blur. The red channel of RGB filter showed a good performance for removing background of the green conveyor belt from merged image. Threshold value reduction method that was a image-based thresholding algorithm performed well for knot detection.

Adaptive Thresholding Method Using Zone Searching Based on Representative Points for Improving the Performance of LCD Defect Detection (LCD 결함 검출 성능 개선을 위한 대표점 기반의 영역 탐색을 이용한 적응적 이진화 기법)

  • Kim, Jin-Uk;Ko, Yun-Ho;Lee, Si-Woong
    • The Journal of the Korea Contents Association
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    • v.16 no.7
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    • pp.689-699
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    • 2016
  • As the demand for LCD increases, the importance of inspection equipment for improving the efficiency of LCD production is continuously emphasized. The pattern inspection apparatus is one that detects minute defects of pattern quickly using optical equipment such as line scan camera. This pattern inspection apparatus makes a decision on whether a pixel is a defect or not using a single threshold value in order to meet constraint of real time inspection. However, a method that uses an adaptive thresholding scheme with different threshold values according to characteristics of each region in a pattern can greatly improve the performance of defect detection. To apply this adaptive thresholding scheme it has to be known that a certain pixel to be inspected belongs to which region. Therefore, this paper proposes a region matching algorithm that recognizes the region of each pixel to be inspected. The proposed algorithm is based on the pattern matching scheme with the consideration of real time constraint of machine vision and implemented through GPGPU in order to be applied to a practical system. Simulation results show that the proposed method not only satisfies the requirement for processing time of practical system but also improves the performance of defect detection.

Usability Research of Onco Flash in SPECT (SPECT 검사에서 Onco Flash의 유용성과 질적 향상 평가)

  • Noh, Ik-Sang;Cha, Eun-Sun;Kim, Ki;Choi, Choon-Ki;Suk, Jae-Dong
    • The Korean Journal of Nuclear Medicine Technology
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    • v.13 no.1
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    • pp.3-8
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    • 2009
  • Purpose: Onco flash shortens a scan time with half and there is a possibility of getting the data which corresponds in existing. The experiment which makes the image whose Onco Flash is excellent OSEM tried, as changes parameter of time, iteration. After reconstituting an image, produces FWHM and executes an evaluation. Materials and Methods: Siemens e.cam gamma camera, standard Jaszczak phantom and spatial resolution phantom was used. In order for the bubble not to enter, implants 2 mCi and volume 0.25 cc $^{99m}Tc$ respectively in line 3 to spatial resolution phantom. Put on that phantom on the table correctly, and acquires an image. 15 mCi putting in distilled water to mix $^{99m}Tc$ well in Jaszczak phantom and acquires image just like spatial resolution phantom. Reconstructs and converts the image to digital image as Sante program. Produce FWHM and evaluate by Amide. Results: The non-scattered image shows better FWHM value than scattered image. As time increases from 10 sec to 30 sec for 5sec interval, FWHM appeared to 30.1, 28.5, 24.5, 23.6, 23.4 mm. At the standard iteration value 4, OSEM FWHM shows 8.0 mm, and Onco Flash is 8.1 mm. As fade in iteration, FWHM value more and more decreased. Conclusion: When using Onco Flash, shortens a scan time, and enhances image quality. Also, user can adjust the parameters to improve resolution. Therefore, patient and user are satisfied with these merits.

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