• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.25 no.10B
• /
• pp.1777-1784
• /
• 2000

In this paper we suggested the chirp stitching algorithm and transmitter/receiver channel to a spaceborne high resolution SAR which enables wideband signal generation and processing with minimum hardware requirement. The transmitter channel generates two sub-band signals and then generate a wideband signal using chirp stitching algorithm and the receiver channel divides a wideband signal into two sub-band signals in order to overcome the high speed data handling capability of this spaceborne systems. We generated and processed a 100 MHz wideband signal evaluated the performance and verified the feasibility of the application of this chirp stitching algorithm and transmitter/receiver channel to spaceborne high resoultion SAR.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2016.07a
• /
• pp.287-288
• /
• 2016

본 논문에서는 한 위치에서 여러방향으로 찍은 사진들을, Image Stitching 기술을 통해 Panorama 영상을 만드는 과정에 대해 연구한다. VR이 주목 받게 됨에 따라 스마트폰이나 360도 카메라를 사용하여 이미지 스티칭 기법을 사용하여 연속적인 사진을 보여주게 되는되 이를 구현 하기 위한 배경 연구들을 분석하고 구현해 봄으로 속도 향상을 아이디어들에 대하여 연구한다.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2010.11a
• /
• pp.691-692
• /
• 2010

본 논문에서는 입체영상 기법과 파노라마 영상 기술을 접목한 입체 파노라마 영상을 애너그리프 방식의 실린더 형태로 구현할 때, 애너그리프 합성 후 파노라마 스티칭 하는 방법과 파노라마 스티칭 후 애너그리프 합성하는 방식 두 가지로 각각 구현 해보고, 두 결과 영상의 Depth map 을 생성하여 입체감 형성 정도 및 왜곡 정도를 분석한다.

• Journal of Broadcast Engineering
• /
• v.24 no.1
• /
• pp.3-24
• /
• 2019

Techniques related to 360 VR service have been developed to improve the quality of the stitched image and video, where illumination compensation scheme is one of the important tools. Among the conventional illumination compensation algorithms, Gain-based compensation and Block Gain-based compensation algorithms have shown the outstanding performances in the process of making panorama picture. However, those are ineffective in the 360 VR service, because the disparity between illuminations of the multiple pictures in 360 VR is much more than that in making the panorama picture. In addition, the number of the pictures to be stitched in 360 VR system is more than that in the conventional panorama image system. Thus, we propose a preprocessing tool to enhance the illumination compensation algorithm so that the method reduces the degradation in the stitched picture of 360 VR systems. The proposed algorithm consists of 'color compensation' and 'illumination compensation'. The simulation results show that the proposed technique improve the conventional techniques without additional complexity.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2011.01a
• /
• pp.47-49
• /
• 2011

본 논문에서는 사용자의 정면, 측면 영상을 이용하여 3차원 얼굴 모델에 적합한 텍스쳐 맵을 생성, 이를 이용하여 3차원 얼굴 모델을 생성하는 방법을 제안한다. 기존 3차원 얼굴 모델은 매핑 할 텍스쳐 영상들을 하나로 통합하여 이를 원통형 좌표계를 통해 텍스쳐링 하는 방법이 이용되고 있다. 이때 정면과 측면의 영상을 3차원 얼굴 모델의 중심축을 기준으로 계산하여 좌표에 맞게 투영시키고 통합 및 보간하여 텍스쳐링 하게 된다. 사용자는 이를 위하여 정면과 측면 영상을 원통형 좌표에 맞게 통합시키는 작업이 필요하다. 본 논문은 사용자에게 수반되는 이러한 작업을 줄이고 발생될 수 있는 텍스쳐의 왜곡을 최소화하기 위한 방법을 제시한다. 2차원 정면 측면 이미지를 3차원 얼굴모델에 투영시키고 정면과 측면을 구분하여 각 텍스쳐 간 경계 부분을 자연스럽게 처리하기 위해 파노라마 이미지 스티칭 기술을 이용하여 텍스쳐링 한 뒤 얼굴 모델을 생성하는 방법에 대해서 기술한다.

• Journal of Broadcast Engineering
• /
• v.25 no.1
• /
• pp.13-24
• /
• 2020

There are about nine million power line poles and 1.3 million kilometers of the power line for electric power distribution in Korea. Maintenance of such a large number of electric power facilities requires a lot of manpower and time. Recently, various fault diagnosis techniques using artificial intelligence have been studied. Therefore, in this paper, proposes a power line deflection detect system using artificial intelligence and computer vision technology in images taken by vision system. The proposed system proceeds as follows. (i) Detection of transmission tower using object detection system (ii) Histogram equalization technique to solve the degradation in image quality problem of video data (iii) In general, since the distance between two transmission towers is long, a panoramic video stitching process is performed to grasp the entire power line (iv) Detecting deflection using computer vision technology after applying power line detection algorithm This paper explain and experiment about each process.

• Journal of radiological science and technology
• /
• v.43 no.5
• /
• pp.331-336
• /
• 2020

In this study, we would like to examine the effect of the location of the magnification marker and the change in the stitching range on the magnification marker and the expansion of the anatomical structure in the examination of femoral stitching radiation using the stitching technique, and to find out the usability of the femoral stitching radiation examination in the preoperative examination for THRA. The measured values measured by 5 researchers were summed and presented through descriptive statistics. When the position of the magnification marker was changed, the average value of the measured value was in the range of 113.54 to 113.90 mm. The anatomical structures of the femur were measured in the range of 57.24 to 57.78 mm, 27.20 to 27.56 mm, and 70.11 to 70.81 mm, respectively. This showed a similar deviation from the expansion rate of previous related papers using markers. Therefore, it is considered that femoral stitching X-ray examination using magnification markers can be used for preoperative examination for THRA.

• Journal of the Korea Society of Computer and Information
• /
• v.29 no.2
• /
• pp.13-20
• /
• 2024

This paper introduces a method for generating model images that can identify specific cylindrical medicine containers in videos and investigates data collection techniques. Previous research had separated object detection from specific object recognition, making it challenging to apply automated image stitching. A significant issue was that the coordinate-based object detection method included extraneous information from outside the object area during the image stitching process. To overcome these challenges, this study applies the newly released YOLOv8 (You Only Look Once) segmentation technique to vertically rotating pill bottles video and employs the ORB (Oriented FAST and Rotated BRIEF) feature matching algorithm to automate model image generation. The research findings demonstrate that applying segmentation techniques improves recognition accuracy when identifying specific pill bottles. The model images created with the feature matching algorithm could accurately identify the specific pill bottles.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2011.10a
• /
• pp.544-546
• /
• 2011

The popularization and development of 3D display makes common users easy to experience a solid 3D virtual reality, the demand for virtual reality contents are increasing. This paper proposes VR panorama system using vanishing point location-based depth map generation method. VR panorama using depth map gives an effect that makes users feel staying at real place and looking around nearby circumstances.

• Journal of Broadcast Engineering
• /
• v.20 no.5
• /
• pp.728-737
• /
• 2015

Stitching algorithm obtain a descriptor of the feature points extracted from multiple images, and create a single image through the matching process between the each of the feature points. In this paper, a feature extraction and matching techniques for the creation of a high-speed panorama using video input is proposed. Features from Accelerated Segment Test(FAST) is used for the feature extraction at high speed. A new feature point matching process, different from the conventional method is proposed. In the matching process, by tracking region containing the feature point through the Mean shift vector required for matching is obtained. Obtained vector is used to match the extracted feature points. In order to remove the outlier, the RANdom Sample Consensus(RANSAC) method is used. By obtaining a homography transformation matrix of the two input images, a single panoramic image is generated. Through experimental results, we show that the proposed algorithm improve of speed panoramic image generation compared to than the existing method.