• International Journal of Contents
• /
• 제10권3호
• /
• pp.9-16
• /
• 2014

Depth-image-based rendering is generally used in real-time 2D-to-3D conversion for 3DTV. However, inaccurate depth maps cause flickering issues between image frames in a video sequence, resulting in eye fatigue while viewing 3DTV. To resolve this flickering issue, we propose a new 2D-to-3D conversion scheme based on fast and robust depth-map generation from a 2D video sequence. The proposed depth-map generation algorithm divides an input video sequence into several cuts using a color histogram. The initial depth of each cut is assigned based on a hypothesized depth-gradient model. The initial depth map of the current frame is refined using color and motion information. Thereafter, the depth map of the next frame is updated using the difference image to reduce depth flickering. The experimental results confirm that the proposed scheme performs real-time 2D-to-3D conversions effectively and reduces human eye fatigue.

• KIEE International Transactions on Electrophysics and Applications
• /
• 제4C권6호
• /
• pp.272-275
• /
• 2004

A balanced single side-band (SSB) mixer employing a sub-harmonic configuration is designed for up and down conversions in K-band. The designed mixer uses anti-parallel diode (APD) pairs to effectively eliminate even harmonics of the local oscillator (LO) spurious signal. To reduce the odd harmonics of LO at the RF port, we employ a balanced configuration for LO. The fabricated chip shows 12$\pm$2dB of conversion loss and image-rejection ratio of about 20dB for down conversion at RF frequencies of 24-27.5GHz. As an up-conversion mode, the designed chip shows 12dB of conversion loss and image-rejection ratio of 20 ～ 25 dB at RF frequencies of 25 to 27GHz. The odd harmonics of the LO are measured below -37dBc.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2009년도 정보 및 제어 심포지움 논문집
• /
• pp.219-221
• /
• 2009

In this paper, we present stereoscopic conversion based on movie shot information. To overcome the low stereoscopic quality of automatic stereo conversion technologies, the usage of the shot type is expected to provide more satisfactory stereoscopic perception. In general, movie clips are produced with a variety of shot techniques such as long shot, closeup shot, medium shot, etc. Each shot has its own characteristics that can be utilized during the conversion process. Furthermore, description sceme for shot and camera information is presented in XML. XML shot editor generates XML shot data. and conversion module parses such data and converts 2D image into stereoscopic image.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2005년도 추계종합학술대회
• /
• pp.1129-1132
• /
• 2005

In this paper, we proposed real-time stereoscopic image conversion algorithm using object segmentation and motion parallax. The proposed algorithm separates objects using luminance of image, extracts moving object among objects of the image using motion parallax and generates depth map. Parallax process is done based on the depth map. The proposed method has been evaluated using visual test and APD(Absolute Parallx Difference) for comparing the stereoscopic image of the proposed method with that of MTD. The proposed method offers realistic stereoscopic conversion effect regardless of the direction and velocity of the 2-D image.

• International Journal of Fuzzy Logic and Intelligent Systems
• /
• 제12권2호
• /
• pp.101-107
• /
• 2012

This study describes a proposed method of converting an input sound signal into a color image by emulating human synesthetic skills which make it possible to associate an sound source with a specific color image. As a first step of sound-to-image conversion, features such as fundamental frequency(F0) and energy are extracted from an input sound source. Then, a musical scale and an octave can be calculated from F0 signals, so that scale, energy and octave can be converted into three elements of HSI model such hue, saturation and intensity, respectively. Finally, a color image with the BMP file format is created as an output of the process of the HSI-to-RGB conversion. We built a basic system on the basis of the proposed method using a standard C-programming. The simulation results revealed that output color images with the BMP file format created from input sound sources have diverse hues corresponding to the change of the F0 signals, where the hue elements have different intensities depending on octaves with the minimum frequency of 20Hz. Furthermore, output images also have various levels of chroma(or saturation) which is directly converted from the energy.

• 한국멀티미디어학회논문지
• /
• 제17권10호
• /
• pp.1171-1181
• /
• 2014

In this paper, we propose improved methods which are image conversion and extraction method of watershed seed using morphological characteristic of teeth on complement image. Conventional tooth segmentation methods are occurred low detection ratio at molar region and over, overlap segmentation owing to specular reflection and morphological feature of molars. Therefore, in order to solve the problems of the conventional methods, we propose the image conversion method and improved extraction method of watershed seed. First, the image conversion method is performed using RGB, HSI space of tooth image for to extract boundary and seed of watershed efficiently. Second, watershed seed is reconstructed using morphological characteristic of teeth. Last, individual tooth segmentation is performed using proposed seed of watershed by watershed algorithm. Therefore, as a result of comparison with marker controlled watershed algorithm and the proposed method, we confirmed higher detection ratio and accuracy than marker controlled watershed algorithm.

• 한국산학기술학회논문지
• /
• 제10권1호
• /
• pp.117-121
• /
• 2009

어안 렌즈 카메라로 촬영한 어안 영상은 일반 카메라 영상보다 화각이 크다. 반면 영상에서 피사체의 왜곡이 커서 사용자의 인지가 어려우므로 원근 영상으로 변환이 필요하다. 기존의 Ishii 방법[1]은 등거리 투영을 사용하므로 피사체가 변환 영상에서 크기와 기하학적 왜곡이 생기는 문제점을 가지고 있었다. 본 논문에서는 스케일링 함수를 이용한 어안 영상의 원근 영상 변환 방법을 제안하였다. 실험에서, 제안한 방법은 스케일링 함수를 적용함으로써 크기 왜곡과 기하학적 왜곡이 감소되었다.

• 한국멀티미디어학회논문지
• /
• 제19권2호
• /
• pp.479-486
• /
• 2016

In this paper, the algorithm which can convert a 2D image into a 3D Model will be discussed. The 2D picture drawn by a user is scanned for image processing. The Canny algorithm is employed to find the contour. The waterfront algorithm is proposed to find foreground image area. The foreground area is segmented to decompose the complex shapes into simple shapes. Then, simple segmented foreground image is converted into 3D model to become a complex 3D model. The 3D conversion formular used in this paper is also discussed. The generated 3D model data will be useful for 3D animation and other 3D contents creation.

• 감성과학
• /
• 제16권2호
• /
• pp.187-194
• /
• 2013

본 연구는 컬러영상에서 특정소리를 연상시킬 수 있는 공감각 인지현상에 기반하여 컬러이미지에서 음악요소로 변환하는 시스템의 구현을 최종 목표로 한다. 이는 빛과 소리의 물리적 주파수정보사이의 유사도를 기반으로 이루어진다. 입력 컬러영상은 우선 컬러모델변환이론에 기초하여 색상(Hue), 채도(Saturation) 및 명도(Intensity)영역으로 변환된다. 음계, 옥타브, 크기 및 시간길이 등의 음악적 성분들이 HSI 컬러모델의 각 영역으로부터 추출된다. 기본주파수(F0, Fundamental Frequency)는 색상 및 명도 히스토그램에서 추출되고, 크기 및 시간길이성분은 명도와 채도 히스토그램에서 추출된다. 실험에서, 제안된 시스템은 표준 C 및 VC++ 기반에서 실현되었고, 최종적으로 WAV 포맷의 사운드파일이 생성되었다. 시뮬레이션 결과를 통해서 입력 컬러영상에서 추출된 음악적 요소들이 출력 사운드신호에 반영됨을 알 수 있었다.

• 정보처리학회논문지B
• /
• 제10B권4호
• /
• pp.359-366
• /
• 2003

본 논문에서는 일반적인 2차원 영상에서 운동 시차론 이용하여 서로 다른 원근 깊이를 갖는 입체 영상을 생성하고, 2차원 영상에서 운동 물체의 운동 방향과 속도에 상관없이 3차원 효과를 제공할 수 있는 입체 영상 변환 방법을 제안하고자 한다. 입체 영상은 제안한 움직임 검출, 영역 분할, 그리고 깊이 지도 생성 방법을 이용하여 인접한 2차원 영상 사이에서 운동 시차를 계산하여 생성된다. 제안한 방법은 다양한 영상원에 대해서 실시간으로 입체 영상 변환이 가능하며, MTD 방식과의 성능 비교를 통하여 제안한 방법의 성능 평가를 수행하였다.