• Title/Summary/Keyword: Mask Operation

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Double Encryption of Binary Image using a Random Phase Mask and Two-step Phase-shifting Digital Holography (랜덤 위상 마스크와 2-단계 위상 천이 디지털 홀로그래피를 이용한 이진 영상 이중 암호화)

  • Kim, Cheolsu
    • Journal of Korea Multimedia Society
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    • v.19 no.6
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    • pp.1043-1051
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    • 2016
  • In this paper, double encryption technique of binary image using random phase mask and 2-step phase-shifting digital holography is proposed. After phase modulating of binary image, firstly, random phase mask to be used as key image is generated through the XOR operation with the binary phase image. And the first encrypted image is encrypted again through the fresnel transform and 2-step phase-shifting digital holography. In the decryption, simple arithmetic operation and inverse Fresnel transform are used to get the first decryption image, and second decryption image is generated through XOR operation between first decryption image and key image. Finally, the original binary image is recovered through phase modulation.

Regional Boundary Operation for Character Recognition Using Skeleton (골격을 이용한 문자 인식을 위한 지역경계 연산)

  • Yoo, Suk Won
    • The Journal of the Convergence on Culture Technology
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    • v.4 no.4
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    • pp.361-366
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    • 2018
  • For each character constituting learning data, different fonts are added in pixel unit to create MASK, and then pixel values belonging to the MASK are divided into three groups. The experimental data are modified into skeletal forms, and then regional boundary operation is used to create a boundary that distinguishes the background region adjacent to the skeleton of the character from the background of the modified experimental data. Discordance values between the modified experimental data and the MASKs are calculated, and then the MASK with the minimum value is found. This MASK is selected as a finally recognized result for the given experiment data. The recognition algorithm using skeleton of the character and the regional boundary operation can easily extend the learning data set by adding new fonts to the given learning data, and also it is simple to implement, and high character recognition rate can be obtained.

A Study on Edge Detection Algorithm using Local Mask and Morphological Operation (모폴로지 연산과 국부 마스크를 이용한 에지 검출 알고리즘에 관한 연구)

  • Lee, Chang-Young;Kim, Nam-Ho
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2015.10a
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    • pp.900-902
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    • 2015
  • In the modern society, according to the advancement in digital image processing technology, edge detection is being utilized in various application sectors such as smart device and medical, etc. In existing edge detection methods, there are Sobel, Prewitt, Roberts and Laplacian, etc, which uses the mask. These previous methods are easy to implement but shows somewhat insufficient results. Therefore, in order to compensate the problems of existing methods, in this paper, an algorithm that detects the edge using the local mask and morphological operation was proposed and the detection performance was compared against the previous methods.

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A study on the non-contact measurement for the temperature of shadow mask of Cathode Ray Tube using InSb photo sensor (인듐안티모나이드 포토 센서를 이용한 CRT 섀도우 마스크의 비접촉 온도 측정에 관한 연구)

  • 강대진;박정우;송창섭
    • Journal of the Korean Society for Precision Engineering
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    • v.14 no.3
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    • pp.15-20
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    • 1997
  • This paper presents the experimental study of the non-contact temperature measurement for the shadow mask of cathode ray tube using InSb sensor. At present, High resolution of CRT(Cathode Ray Tube) is needed broadly; therefore, the measurement of temperature distribution of shadow mask in CRT during operation is important to analyze the thermal deformation of shadow mask. Most of the studies could not measure the temperature distribution of shadow mask precisely. We studied the temperature dis- tribution of shadow mask using InSb photo sensor for 17" cathode ray tube (CRT). Experiments using ther- mocouple are performed to validate the results of non-contact measurement. The results agree well with those results of non-contact method using InSb sensor.nsor.

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On the Minimization of the Switching Function by the MASK Method (MASK 방법에 의한 이론함수의 최소화)

  • 조동섭;황희융
    • 전기의세계
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    • v.28 no.11
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    • pp.37-44
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    • 1979
  • This paper deals with the computer program of finding the minimal sum-of-products for a switching function by using the MASK method derived from the characteristics of the Boolean algebra. The approach differs from the previous procedures in that all the prime implicants are determined only by the bit operation and the minimal sum-of-products are obtained by the modified Petrick method in this work. The important features are the relatively small amount of the run time and the less memory capacity to solve a problem, as compared to the previous computer programs.

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Design of a real-time image preprocessing system with linescan camera interface (라인스캔 카메라 인터페이스를 갖는 실시간 영상 전처리 시스템의 설계)

  • Lyou, Kyeong;Kim, Kyeong-Min;Park, Gwi-Tae
    • Journal of Institute of Control, Robotics and Systems
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    • v.3 no.6
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    • pp.626-631
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    • 1997
  • This paper represents the design of a real-time image preprocessing system. The preprocessing system performs hardware-wise mask operations and thresholding operations at the speed of camera output single rate. The preprocessing system consists of the preprocessing board and the main processing board. The preprocessing board includes preprocessing unit that includes a $5\times5$ mask processor and LUT, and can perform mask and threshold operations in real-time. To achieve high-resolution image input data($20485\timesn$), the preprocessing board has a linescan camera interface. The main processing board includes the image processor unit and main processor unit. The image processor unit is equipped with TI's TMS320C32 DSP and can perform image processing algorithms at high speed. The main processor unit controls the operation of total system. The proposed system is faster than the conventional CPU based system.

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A Novel Volume Hologram Encryption Using Complementary Data and Binary Amplitude Mask (상보 데이터와 이진 진폭 마스크를 이용한 새로운 체적 홀로그램 암호화)

  • Kim, Hyun;Kim, Do-Hyung;Lee, Yeon-H.
    • Transactions of the Society of Information Storage Systems
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    • v.1 no.2
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    • pp.143-149
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    • 2005
  • In this paper we propose a novel volume hologram encryption system with binary amplitude masks rather than phase masks, in which volume holograms can be securely recorded against the attacks by a third party. In our system, the encryption is done by multiplexing two volume holograms in such a way that an original binary data page is first stored as a volume hologram by interference with a binary amplitude mask and then the complementary data page is stored as another volume hologram by interference with the complementary binary amplitude mask over the first hologram. The operation principle of our system is explained with the well-known theory of recording and reading a volume hologram in a photorefractive material and the experimental results are presented. Experimental data show that our encryption system is protected from blind decryptions by randomly-generated incorrect amplitude masks.

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Accelerated Convolution Image Processing by Using Look-Up Table and Overlap Region Buffering Method (Loop-Up Table과 필터 중첩영역 버퍼링 기법을 이용한 컨벌루션 영상처리 고속화)

  • Kim, Hyun-Woo;Kim, Min-Young
    • Journal of the Institute of Electronics Engineers of Korea SC
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    • v.49 no.4
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    • pp.17-22
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    • 2012
  • Convolution filtering methods have been widely applied to various digital signal processing fields for image blurring, sharpening, edge detection, and noise reduction, etc. According to their application purpose, the filter mask size or shape and the mask value are selected in advance, and the designed filter is applied to input image for the convolution processing. In this paper, we proposed an image processing acceleration method for the convolution processing by using two-dimensional Look-up table (LUT) and overlap-region buffering technique. First, based on the fixed convolution mask value, the multiplication operation between 8 or 10 bit pixel values of the input image and the filter mask values is performed a priori, and the results memorized in LUT are referred during the convolution process. Second, based on symmetric structural characteristics of the convolution filters, inherent duplicated operation region is analysed, and the saved operation results in one step before in the predefined memory buffer is recalled and reused in current operation step. Through this buffering, unnecessary repeated filter operation on the same regions is minimized in sequential manner. As the proposed algorithms minimize the computational amount needed for the convolution operation, they work well under the operation environments utilizing embedded systems with limited computational resources or the environments of utilizing general personnel computers. A series of experiments under various situations verifies the effectiveness and usefulness of the proposed methods.

Implementation of Exposure Stage Integrated Control System for FPD (FPD용 노광 스테이지의 통합 제어시스템 구현)

  • Kim, Jong-Won;Seo, Jae-Yong;Cho, Hyun-Chan;Cho, Tai-Hoon;Kang, Heung-Seok
    • Journal of the Semiconductor & Display Technology
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    • v.5 no.4 s.17
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    • pp.11-15
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    • 2006
  • Expose equipment system that is used for manufacturing process of Flat Panel Display, is most important equipment in whole process. Expose equipment that is for making pattern of mask on substrate, consists of optical part, stage part and transport part. The stage is an important part that aligns mask and substrate for delivering pattern of mask to substrate exactly. In this paper, control system of expose stage that is able to use mask and substrate of diverse size, with PC controller using GUI interface instead of PLC control system. The existing PLC control system does not have the suitable structure for using mask of diverse size. GUI interface integration control system is based on PC. So it has the advantage of convenient use and active operation. We embodied PLC control system in integration control system based on PC, and verified utility possibility through the standard test course.

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A Case Report of Injection Laryngoplasty Who have Difficulty in Neck Extension Using, an I-Gel Laryngeal Mask Airway (경부 신전이 불가한 성대 마비 환자에서 I-Gel$^{TM}$ 후두마스크를 이용한 전신 마취하 성대주입술 증례)

  • Jo, Kwang-Hee;Jung, Chan-Min;Jang, Chul-Ho;Choi, Hong-Shik
    • Journal of the Korean Society of Laryngology, Phoniatrics and Logopedics
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    • v.25 no.2
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    • pp.96-98
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    • 2014
  • Injection laryngoplasty is simple and useful procedure in patient with vocal cord paralysis even under local anesthesia. For approaching vocal cord level, flexibility of neck mobility is required to operate injection laryngoplasty but it is relatively difficult to approach vocal cord in patient who has cervical fixations. Laryngeal mask airway (LMA) can be helpful:We use a LMA (I-gel$^{TM}$) during intubation without neck extension on flat supine position under general anesthesia and have a good operation filed. LMA with swivel connector give surgeons better surgical vision and make insertion of fibroscope easily during operation. Hyaluronic acid injection was done use needle (25 G, 5 cm) via percutaneous cricothyroid space : This procedure can be useful method for patients who suffer from not only weak voice but also dysphagia and aspiration high vagal palsy patient after spine surgery or uncooperative with awake injection laryngoplasty.

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