• 한국통신학회논문지
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• 제34권10B호
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• pp.1086-1092
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• 2009

Stereoscopic conversion has been an important and challenging issue for many 3-D video applications. Usually, there are two different stereoscopic conversion approaches, i.e., image motion-based conversion that uses motion information and object-based conversion that partitions an image into moving or static foreground object(s) and background and then converts the foreground in a stereoscopic object. As well, since the input sequence is MPEG-1/2 compressed video, motion data stored in compressed bitstream are often unreliable and thus the image motion-based conversion might fail. To solve this problem, we present the utilization of key-motion that has the better accuracy of estimated or extracted motion information. To deal with diverse motion types, a transform space produced from motion vectors and color differences is introduced. A key-motion is determined from the transform space and its associated stereoscopic image is generated. Experimental results validate effectiveness and robustness of the proposed method.

• 한국멀티미디어학회논문지
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• 제17권11호
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• pp.1270-1278
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• 2014

The modern infrared (IR) imaging systems use mainly one or more wavelength bands among short wavelength IR (SWIR), middle wavelength IR (MWIR), and long wavelength IR (LWIR) bands. In the process of IR image synthesis and modeling, IR image wavelength-band conversion which transforms arbitrary band image to other band one is required. The wavelength-band conversion procedure includes a temperature estimation process of an object surface. However, in this procedure, an approximated Planck's radiation equation causes errors in estimated temperature. In this paper, we propose an estimation temperature error attenuation method in IR image band conversion procedure. The estimated temperature is corrected with a slope information of radiance according to it. The corrected temperature is used for generation of the other band IR image. The verification of proposed method is demonstrated through the simulation.

• IEIE Transactions on Smart Processing and Computing
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• 제3권3호
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• pp.103-109
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• 2014

This study derived the inter-conversion matrices, which can be used in heterogeneous image transcoding between the compressed images using different transforms, such as the $8{\times}8$ block discrete cosine transform (BDCT) and the one-level discrete wavelet transform (DWT). Basically, to obtain the one-level DWT coefficients from $8{\times}8$ BDCT, inverse BDCT should be performed followed by forward DWT, and vice versa. On the other hand, if the proposed interconversion approach is used, only one inter-conversion matrix multiplication makes the corresponding transcoding possible. Both theoretical and experimental analyses showed that the amount of computation of the proposed approach decreases over 20% when the inter-conversion matrices are used under specific conditions.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.663-668
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• 2003

This paper presents a new observation system which is useful to observe the scene of the remote controlled robot vision. This system is composed of a motionless camera and head motion detector with a motion sensor. The motionless camera has a fish eye lens and is for observing a hemisphere space. The head motion detector has a motion sensor is for defining an arbitrary subspace of the hemisphere space from fish eye lens. Thus processing the angular information from the motion sensor appropriately, the direction of face is estimated. However, since the fisheye image is distorted, it is unclear image. The partial domain of a fish eye image is selected by head motion, and this is converted to perspective image. However, since this conversion enlarges the original image spatially and is based on discrete data, crevice is generated in the converted image. To solve this problem, interpolation based on an intensity of the image is performed for the crevice in the converted image (space problem). This paper provides the experimental results of the proposed observation system with the head motion detector and perspective image conversion using the proposed conversion and interpolation methods, and the adequacy and improving point of the proposed techniques are discussed.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
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• pp.25-27
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• 2009

This paper presents the stereoscopic conversion of flame images. The stereoscopic conversion is a technology that generates left and right images from a monoscopic image. Even though many conversion methods have been introduced and commercialized so far, the processing of flame images is relatively few. Such conventional methods are effectively used either real-time or off-line. However, the application of such schemes to special-effect images such as flame is hard to be applied. The proposed method is designed to convert a flame image into a stereoscopic image. Depth map of flame regions are produced based on the analysis of color models of flames. Experimental results tested on diverse flame image sets validates the effectiveness of the proposed method.

• 한국음향학회지
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• 제30권3호
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• pp.142-148
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• 2011

본 연구는 컬러이미지에서 특정 사운드를 연상하는 인간의 공감각적 기능을 모방하는 지능로봇의 개발을 최종 목표로 하고 있으며, 이는 컬러이미지와 사운드의 상호변환에 기초하여 이루어질 수 있다. 최종 목표의 첫 번째 단계로서, 본 연구는 컬러 이미지에서 사운드로의 변환을 이용한 기본 시스템의 구축에 초점을 맞추었다. 본 연구에서는 빛과 소리사이의 물리적 주파수 정보로부터 그 유사성에 기초하여 컬러이미지에서 사운드로 변환하는 방법을 제시한다. 컬러이미지에서 사운드로 변환하는 방법은 RGB-to-HSI 컬러모델 변환을 통한 HSI 히스토그램을 사용하고 Microsoft Visual C++을 이용하여 코딩함으로써 구현되었다. 두 가지 컬러이미지를 사용하여 시뮬레이션 실험을 하였고, 그 결과, 각각의 입력 컬러이미지의 색상(Hue), 채도 (Saturation) 및 명도 (Intensity)를 사운드의 기본주파수 (F0: Fundamental Frequency), 하모닉 (Harmonics) 및 옥타브 (Octave)로 각각 변환한다. 제안된 시스템을 통하여 변환된 사운드 요소들을 Csound를 이용, 합성함으로써 웨이브(wav) 파일 포맷 음원을 최종 생성하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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• pp.2407-2410
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• 2003

In this paper, we propose a new stereoscopic video conversion methodology that converts two-dimensional (2-D) MPEG-4 video to stereoscopic video. In MPEG-4, each Image is composed of background object and primary object. In the first step of the conversion methodology, the camera motion type is determined for stereo Image generation. In the second step, the object-based stereo image generation is carried out. The background object makes use of a current image and a delayed image for its stereo image generation. On the other hand, the primary object uses a current image and its horizontally-shifted version to avoid the possible vertical parallax that could happen. Furthermore, URFA(Uncovered Region Filling Algorithm) is applied in the uncovered region which might be created after the stereo image generation of a primary object. In our experiment, show MPEG-4 test video and its stereoscopic video based upon out proposed methodology and analyze Its results.

• 디자인학연구
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• 제15권1호
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• pp.309-318
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• 2002

시각디자인(visual communication design)에서 이미지의 표현은 전통적으로 여러 표현매체(Media)의 매커니컬한 부분과 깊은 관계가 있다. 특히 디지털방식을 이용한 이미지 표현에서는 회화적인 표한 도면작성, 광학적인 표현, 영상이미지 등 다양한 형식의 이미지들이 디지털데이터로 전환됨으로써 이미지의 변환이 쉬워졌다. 한편 디지털형식으로 각종 표현매체가 통합됨으로써 여러 형식의 시각이미지들간의 함성이 활성화됨으로써 이미지표현의 범위가 다양해지고 있으며, 나아가 기존의 평면적인 표현에서 3D, 4D 등 다양한 차원의(dimensional) 표현들이 디지털디자인의 이미지표현에서 종합되고 있는 경향을 보이고 있다. 또한 이렇게 여러 이미지형식들이 종합되는 과정에서 부분적이거나 전체적인 이미지의 변환이 자주 발생하고 있으며, 그 변환은 크게 조형적인 측면과 기술적인 측면의 두 가지 요인으로 요약된다. 본 논문에서는 조형적 측면으로 기존의 회화적 표현과 사진술로 대표되는 광학적 표한 그리고 컴퓨터그래픽에서의 이미지 변환 원리를 유형화하고 기술적인 측면으로 데이터형식에 따른 이미지의 변환과 디멘션에 따른 세부적인 내용을 기술하였다. 이 중 특히 기술적이고 정량적인 측정이 필요한 내용에 대해서는 컴퓨터를 이용한 간단한 시뮬레이션을 통해 객관적이고 실증적인 결과를 요약하였고, 연구내용의 세부적인 결과를 실제 시각디자인 작업에서 활용하는 방안을 사안별로 제시했다.

• International journal of advanced smart convergence
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• 제12권2호
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• pp.67-75
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• 2023

Recently, many studies have been conducted on ways to utilize AI technology in NIDS (Network Intrusion Detection System). In particular, CNN-based NIDS generally shows excellent performance. CNN is basically a method of using correlation between pixels existing in an image. Therefore, the method of generating an image is very important in CNN. In this paper, the performance comparison of CNN-based NIDS according to the image generation method was performed. The image generation methods used in the experiment are a direct conversion method and a one-hot encoding based method. As a result of the experiment, the performance of NIDS was different depending on the image generation method. In particular, it was confirmed that the method combining the direct conversion method and the one-hot encoding based method proposed in this paper showed the best performance.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.365-368
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• 2000

This paper describes image-rejection down conversion mixer for bluetooth application using 0.35u CMOS process. the proposed architecture is composed of LO phase shifter, mixer core, IF buffer, and IF phase shifter. IF phase shifter is designed using polyphase fillet. Simulation results show conversion gain = l0㏈, input 1㏈ compression point = -15.7㏈m. input third-order intercept point(IIP3) = -4.4㏈m, and image-rejection ratio = 37.8㏈, respectively, at 3V supply voltage, and 15.7㎃ current.