• Title/Summary/Keyword: Gray Scale Image

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Vehicle License Plate Recognition System Using Image Binarization and Template Matching (영상 이진화와 템플릿 매칭을 이용한 자동차 번호판 인식 시스템)

  • Oh, Soojin;Park, Chun-Su
    • Journal of the Semiconductor & Display Technology
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    • v.13 no.2
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    • pp.7-12
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    • 2014
  • A vehicle license plate includes the most important information for recognition and classification of the vehicle. In this paper, we propose a vehicle license plate recognition system using image binarization and template matching. In the proposed system, an image of the vehicle license plate is converted into a gray scale image and the gray image undergoes the binarization process. Finally, the numbers on the plate are extracted from the binary image using the template matching algorithm.

Contour Shape Matching based Motion Vector Estimation for Subfield Gray-scale Display Devices (서브필드계조방식 디스플레이 장치를 위한 컨투어 쉐이프 매칭 기반의 모션벡터 추정)

  • Choi, Im-Su;Kim, Jae-Hee
    • Proceedings of the IEEK Conference
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    • 2007.07a
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    • pp.327-328
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    • 2007
  • A contour shape matching based pixel motion estimation is proposed. The pixel motion information is very useful to compensate the motion artifact generated at the specific gray level contours in the moving image for subfield gray-scale display devices. In this motion estimation method, the gray level boundary contours are extracted from the input image. Then using contour shape matching, the most similar contour in next frame is found, and the contour is divided into segment unit. The pixel motion vector is estimated from the displacement of the each segment in the contour by segment matching. From this method, more precise motion vector can be estimated and this method is more robust to image motion with rotation or from illumination variations.

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Enhancement of Faded Images Using Integrated Compensation Coefficients Based on Multi-Scale Gray World Algorithm (다중크기 회색계 알고리즘 기반의 통합된 보정 계수를 이용한 바랜 영상 개선)

  • Kyung, Wang-Jun;Kim, Dae-Chul;Ha, Yeong-Ho
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.39A no.8
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    • pp.459-466
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    • 2014
  • Fading effect of old pictures and printings is shown up differently according to the ink property, temperature, humidity, illuminants, and so on. Faded image enhancement techniques based on illuminant estimation are proposed such as the gray world algorithm and white patch retinex methods. However, conventional simple operators are not suitable for enhancing faded images because partial fading effect is appeared differently. Thus, this paper presents a color enhancement algorithm based on integrating correction coefficients for faded images. First, the proposed method adopts local process by using multi-scale average mask. The coefficients for each multi-scale average mask are obtained to apply the gray world algorithm. Then, integrating the coefficients with weights is performed to calculate correction ratio for red and blue channels in the gray world assumption. Finally, the enhanced image is obtained by applying the integrated coefficients to the gray world algorithm. In the experimental results, the proposed method reproduces better colors for both wholly and partially faded images compared with the previous methods.

Implementation of OMR Answer Paper Scoring Method Using Image Processing Method (영상처리기법을 활용한 OMR 답안지 채점방법의 구현)

  • Kwon, Hiok-Han;Hwang, Gi-Hyun
    • Journal of the Institute of Convergence Signal Processing
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    • v.12 no.3
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    • pp.169-175
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    • 2011
  • In this paper, an automatic scoring system of the OMR answer sheet is implemented using Gray Scale and image segmentation method. The proposed method was used to extract the OMR data on multiple-choice answer sheet from captured image. In addition, On-line scoring system is developed and implemented to mark the short-answer type on the reverse side. Therefore, teachers can mark the short-answer type for anytime and anywhere within the available time. There were many advantages to mark of the multiple-choice answer sheet without additional OMR reader. In the future, the grading of short-answer type will be more efficient if it were performed by using an automatic scoring system based on image processing.

An LBX Interleaving Watermarking Method with Robustness against Image Removing Attack (영상제거 공격에 강인한 LBX 인터리빙 워터마킹 방법)

  • 고성식;김정화
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.41 no.6
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    • pp.1-7
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    • 2004
  • The rapid growth of digital media and communication networks has created an urgent need for self-contained data identification methods to create adequate intellectual property right(IPR) protection technology. In this paper we propose a new watermarking method that could embed the gray-scale watermark logo in low frequency coefficients of discrete wavelet transform(DWT) domain as the marking space by using our Linear Bit-eXpansion(LBX) interleaving of gray-scale watermark, to use lots of watermark information without distortion of watermarked image quality and particularly to be robust against attack which could remove a part of image. Experimental results demonstrated the high robustness in particular against attacks such as image cropping and rotation which could remove a part of image.

Measurement of Visibility about Image (영상에 대한 이미지 선명도 측정)

  • Yu, Ji-Chul;Kim, Yung-Kil
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • v.9 no.2
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    • pp.327-331
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    • 2005
  • In this paper, Another way to measure the visibility of image is presented, and this way is different with existing way which is measured by filtering such as High pass, Low pass. Dynamic range, Gray level and Condition Curve Graph is used among much information of histogram, and the output is limited by log scale. As a result, I can confirm that the output is reasonable. With this output, I present that the possibility of another way to measure the visibility of image is existing.

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Design of a Capacitive Detection Circuit using MUX and DLC based on a vMOS (vMOS 기반의 DLC와 MUX를 이용한 용량성 감지회로)

  • Jung, Seung-Min
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.11 no.4
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    • pp.63-69
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    • 2012
  • This paper describes novel scheme of a gray scale capacitive fingerprint image for high-accuracy capacitive sensor chip. The typical gray scale image scheme used a DAC of big size layout or charge-pump circuit of non-volatile memory with high power consumption and complexity by a global clock signal. A modified capacitive detection circuit of charge sharing scheme is proposed, which uses DLC(down literal circuit) based on a neuron MOS(vMOS) and analog simple multiplexor. The detection circuit is designed and simulated in 3.3V, $0.35{\mu}m$ standard CMOS process. Because the proposed circuit does not need a comparator and peripheral circuits, a pixel layout size can be reduced and the image resolution can be improved.

A Study of a High Performance Capacitive Sensing Scheme Using a Floating-Gate MOS Transistor

  • Jung, Seung-Min
    • Journal of information and communication convergence engineering
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    • v.10 no.2
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    • pp.194-199
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    • 2012
  • This paper proposes a novel scheme of a gray scale fingerprint image for a high-accuracy capacitive sensor chip. The conventional grayscale image scheme uses a digital-to-analog converter (DAC) of a large-scale layout or charge-pump circuit with high power consumption and complexity by a global clock signal. A modified capacitive detection circuit for the charge sharing scheme is proposed, which uses a down literal circuit (DLC) with a floating-gate metal-oxide semiconductor transistor (FGMOS) based on a neuron model. The detection circuit is designed and simulated in a 3.3 V, 0.35 ${\mu}m$ standard CMOS process. Because the proposed circuit does not need a comparator and peripheral circuits, the pixel layout size can be reduced and the image resolution can be improved.

Fuzzy Sub-Field Mapping Algorithm For High Image Quality PDP (고화질 PDP를 위한 Fuzzy Sub-Field 맵핑 알고리즘)

  • 구본철;진성일;최두현
    • Proceedings of the IEEK Conference
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    • 2003.11a
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    • pp.359-362
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    • 2003
  • In PDP(Plasma Display Panel), sub-field method is used to implement gray scale. Each sub-field has different periods. And Every gray level has information of which sub-field has to be displayed. This is called sub-field mapping. There are several sub-field mapping values in some gray levels. So, it is possible to select best choice in this paper, we propose new sub field mapping method using a fuzzy inference system to select best sub-field mapping values in accordance with input image and environment temperature. In order to implement fuzzy system, we used MATLAB fuzzy inference editor.

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Study on Sustain Driving Waveform for Linear Gray Scale Expression in AC Plasma Display Panel (플라즈마 디스플레이 패널에서 선형적 계조 표현을 위한 유지 구동파형의 연구)

  • Cho, Byung-Gwon
    • Journal of the Institute of Electronics and Information Engineers
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    • v.51 no.6
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    • pp.255-260
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    • 2014
  • A new sustain driving waveform and its implementation method is proposed to improve the gray scale linearity by applying the sustain waveform for producing the strong and weak discharge in AC plasma display panel. The driving method to express the gray scale of AC PDP is the combination of the several subfield in one TV frame, and the luminance of the each subfield is decided by the number of the sustain pulses. As the same amount of the strong plasma discharge is produced when the sustain pulses are applied during a sustain period, it looks easy to express the linear gray scale ideally. However, it is difficult to express the real linear gray scale due to the production of the address and first sustain discharge irrelevant to gray scale expression in every subfleld. Therefore, a new sustain driving waveformis adopted to produce partially the weak discharge instead of the strong discharge by the modification of the sustain pulses shape during the sustain period and the gray scale expression is close to the linearity.