• Journal of Information Processing Systems
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• 제9권3호
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• pp.499-510
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• 2013

Hardware-Software co-simulation of a multiple image encryption technique shall be described in this paper. Our proposed multiple image encryption technique is based on the Latin Square Image Cipher (LSIC). First, a carrier image that is based on the Latin Square is generated by using 256-bits of length key. The XOR operation is applied between an input image and the Latin Square Image to generate an encrypted image. Then, the XOR operation is applied between the encrypted image and the second input image to encrypt the second image. This process is continues until the nth input image is encrypted. We achieved hardware co-simulation of the proposed multiple image encryption technique by using the Xilinx System Generator (XSG). This encryption technique is modeled using Simulink and XSG Block set and synthesized onto Virtex 2 pro FPGA device. We validated our proposed technique by using the hardware software co-simulation method.

• 대한방사선기술학회지:방사선기술과학
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• 제42권2호
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• pp.119-130
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• 2019

Positron emission tomography (PET) is widely used imaging modality for effective and accurate functional testing and medical diagnosis using radioactive isotopes. However, PET has difficulties in acquiring images with high image quality due to constraints such as the amount of radioactive isotopes injected into the patient, the detection time, the characteristics of the detector, and the patient's motion. In order to overcome this problem, we have succeeded to improve the image quality by using the dynamic image reconstruction method based on singular value decomposition. However, there is still some question about the characteristics of the proposed technique. In this study, the characteristics of reconstruction method based on singular value decomposition was estimated over computational simulation. As a result, we confirmed that the singular value decomposition based reconstruction technique distinguishes the images well when the signal - to - noise ratio of the input image is more than 20 decibels and the feature vector angle is more than 60 degrees. In addition, the proposed methode to estimate the characteristics of reconstruction technique can be applied to other spatio-temporal feature based dynamic image reconstruction techniques. The deduced conclusion of this study can be useful guideline to apply medical image into SVD based dynamic image reconstruction technique to improve the accuracy of medical diagnosis.

• 한국멀티미디어학회논문지
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• 제18권3호
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• pp.349-358
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• 2015

Simulating color appearance of makeup effect is an important issue in computer graphics as well as cosmetic industry. Most of previous works on makeup simulation are simple color blending to mimic the cosmetic effects. Some of previous works employed Kubelka-Munk model to accurately simulate the layering effect of cosmetics. However, the simulation limited on single point, and the rest of area are still computed by simple color blending utilizing the color of the single point simulation. This paper presents an image-based method to compute the color appearance effect of makeup application using per-pixel Kubelka-Munk model. Unlike the previous methods, it is possible to compute per-pixel application thickness as well as optical property of cosmetics. The computed thickness pattern can be used in makeup simulation for a more realistic makeup simulation.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2014년도 추계학술대회
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• pp.818-819
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• 2014

최근 안경을 쓰지 않고 3차원 입체 영상을 볼 수 있는 무안경식 3차원 디스플레이 중에서 DIBR(Depth-Image-Based Rendering) 기반의 중간 영상을 생성하는 연구가 많이 진행되고 있다. DIBR 기반의 중간 영상 생성 방법은 정확한 깊이 정보를 요구하기 때문에 기존의 연구에서는 고가의 깊이 카메라를 활용하였다. 본 연구에서는 마이크로소프트사의 키넥트 센서를 이용한 실사 영상과 깊이 영상을 기반으로 다시점 중간 영상을 생성할 수 있는 시뮬레이션 프로그램을 개발하였다. 이 시뮬레이션은 키넥트(Kinect)를 활용한 저해상도의 깊이 영상으로부터 자연스러운 다시점 영상을 획득하는 것을 목적으로 하며, 이를 위해 생성된 영상의 품질을 평가할 수 있는 기능을 통합적으로 제공한다. 본 논문에서는 이러한 시뮬레이션 프로그램의 시스템 구조와 구현에 대해서 설명한다.

• 한국시뮬레이션학회논문지
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• 제18권2호
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• pp.39-48
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• 2009

본 연구는 내용 기반 이미지 검색 관련한 기존의 이미지 검색 방식에 관한 고찰을 통하여 이미지 검색의 한계점을 살펴보고, 보다 효율적인 내용기반의 이미지 검색을 위한 사용자용 인터페이스와 이미지 속성 활용 방법에 대하여 제안 하고자 한다. 현재 이미지 검색에 관련된 대부분의 연구들은 내용기반을 위주로 연구가 진행되고 있으며, 대표적으로는 이미지의 색상, 질감, 모양, 전체적인 이미지 형태를 기준으로 검색을 시도하고 있다. 하지만 여러 가지 기술적 한계로 인하여 만족할 만한 검색결과를 얻지 못하고 있다. 이에 본 연구에서는 내용기반 이미지 검색과 종래의 키워드 검색 방식을 적용한 새로운 검색방식을 제안하였다. 이는 이미지 내에 텍스트로 속성을 부여하는 방법과, 이미지 내의 속성정보들을 키워드화 하여 검색에 활용함으로써 이미지를 빠르게 검색하는 방법에 대한 것이다. 또한 인터넷상에서의 질의어 생성을 위한 사용자 인터페이스용 시뮬레이션과 이미지 속성을 기반으로 한 검색 시스템개발 시 활용할 수 있는 분야로 인터넷 쇼핑몰의 의류상품 검색을 중심으로 설명 하였다. 본 연구로 인해 인터넷 쇼핑몰에서 새로운 구매유형이 추가될 수 있고, 유사 이미지 검색 분야의 발전에 기여할 것이다.

• 전자공학회논문지A
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• 제32A권10호
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• pp.51-63
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• 1995

In this paper, a new real-time optical image switching system based on the phase-typed BPEJTC is suggested. The phase filter mask which has the arbitrary position mapping function between input and output planes is constructed by using the modified JTPS of the BPEJTC. Then, the input image is convolved with this phase filter mask in the spatial frequency domain and through further Fourier transform the input image is switched to the new positions in the output correlation plane where the correlation peaks are occurred. And, based on the computer simulation results, the practical optical switched to the new positions in the output correlation plane where the correlation peaks are occurred. And, based on the computer simulation results, the practical optical switching system is opto-digitally constructed and through some experiments on image switching the possiblity of real-time implementation of the multiple optical image switching system by using the BPEJTC is suggeste.

• Journal of International Society for Simulation Surgery
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• 제4권1호
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• pp.21-23
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• 2017

Purpose In this paper, we proposed alternate neighborhood system and reverse spread-direction approach for accurate and fast cellular automata-based image segmentation method. Materials and Methods On the basis of a simple but effective interactive image segmentation technique based on a cellular automaton, we propose an efficient algorithm by using Moore and designed neighborhood system alternately and reversing the direction of the reference pixels for spreading out to the surrounding pixels. Results In our experiments, the GrabCut database were used for evaluation. According to our experimental results, the proposed method allows cellular automata-based image segmentation method to faster while maintaining the segmentation quality. Conclusion Our results proved that proposed method improved accuracy and reduced computation time, and also could be applied to a large range of applications.

• Current Optics and Photonics
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• 제5권4호
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• pp.421-430
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• 2021

The multifocal multiphoton microscopy (MMM) enables high-speed imaging by the concurrent scanning and detection of multiple foci generated by lenslet array or diffractive optical element. The MMM system mainly suffers from crosstalk generated by scattered emission photons that form ghost images among adjacent channels. The ghost image which is a duplicate of the image acquired in sub-images significantly degrades overall image quality. To eliminate the ghost image, the photon reassignment method was established using maximum likelihood estimation. However, this post-processing method generally takes a longer time than image acquisition. In this regard, we propose a novel strategy for rapid noise reduction in the MMM system based upon Monte-Carlo (MC) simulation. Ballistic signal, scattering signal, and scattering noise of each channel are quantified in terms of photon distribution launched in tissue model based on MC simulation. From the analysis of photon distribution, we successfully eliminated the ghost images in the MMM sub-images. If the priori MC simulation under a certain optical condition is established at once, our simple, but robust post-processing technique will continuously provide the noise-reduced images, while significantly reducing the computational cost.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
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• pp.327-330
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• 2002

This paper proposes the simulation algorithm of rear lamp of car using a ray tracing method that models transmission and refraction of light frequently used in computer graphics At first. To reproduce an image accurately. incident on a sight of viewer, we propose the backward ray tracing method based on spectral distribution representing physical characteristics of illuminant and object used in real. We implement the reproduction algorithm of rear lamp image applying the Bouguer-Beer's law to an optical absorptive phenomenon. As the result, more realistic image can be reproduced.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 D
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• pp.2625-2627
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• 2001

Recently wavelet transform is used in various fields. Especially it is available in image compression. In this paper we will present wavelet compression of acoustic-based underwater image by simulation.