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Kim D.,University of Wisconsin - Milwaukee | Shin H.,University of Wisconsin - Milwaukee | Oh J.,Broadcast Technical Research Institute | Sohn K.,Yonsei University
Journal of Electronic Imaging | Year: 2010

We present a novel method for automatically correcting the radial lens distortion in a zoom lens video camera system. We first define the zoom lens distortion model using an inherent characteristic of the zoom lens. Next, we sample some video frames with different focal lengths and estimate their radial distortion parameters and focal lengths.We then optimize the zoom lens distortion model with preestimated parameter pairs using the least-squares method. For more robust optimization, we divide the sample images into two groups according to distortion types (i.e., barrel and pincushion) and then separately optimize the zoom lens distortion models with respect to divided groups. Our results show that the zoom lens distortion model can accurately represent the radial distortion of a zoom lens. © 2010 SPIE and IS&T.


Choi S.,Technical Research Institute of Korean Broadcasting System | Lee M.,KAIST | Jung B.,Broadcast Technical Research Institute | Ahn K.,Kyung Hee University | And 3 more authors.
SMPTE Motion Imaging Journal | Year: 2015

The quality of digital content has become increasingly significant in digital broadcasting systems. These days, consumers react to even subtle defects in media content, which, in turn, influence consumer satisfaction about the content. The development of digital broadcasting technology has replaced tape-based content with file-based content. Nonetheless, in the process of generating file-based content, people are often confronted with different types of errors. Detecting such errors and fixing them require a substantial amount of time and human labor, whereas being unable to fix them might lead to broadcast failure. Therefore, in this paper, we introduce an automated restoration system that reduces intensive human labor in fixing errors in the content generating process. Our automated video restoration system can be applied to different types of classic errors. We developed several customized algorithms to restore each error in the digital content derived from the Korean Broadcasting System video archives. Implementing our method as a familiar tool for content producers is also a consideration. We are developing the restoration system as a plug-in to a well-known nonlinear editing system. © Copyright 2014 IBC.


Oh Y.,Research South, Inc. | Jung C.,Joined Saltlux Inc. | Han S.,Korea Saltlux Inc. | Jung B.,Research South, Inc. | And 2 more authors.
ABU Technical Review | Year: 2014

This paper introduces new methods for enhancing content search and navigation, and the iLike system that provides improved accessibility to the KBS video archive for TV producers. The iLike system is developed based on our content-based search and recommendation engine. The search and recommendation engine analyzes broadcast metadata and text-based supplementary data, retrieves related information such as keywords, and provides search and recommendation results in XML or JSON. In order to improve broadcast content accessibility, a variety of content search and navigation UXs have been implemented in the iLike system. The iLike system has been running since 2012 in KBS, and continuous updates are being made for stability and usability.


Lee J.,Broadcast Technical Research Institute
IEEE International Symposium on Broadband Multimedia Systems and Broadcasting 2010, BMSB 2010 - Final Programme | Year: 2010

It is well known that high power amplifier (HPA) induces nonlinear distortion around its saturation region. It causes the inter-modulation distortion (IMD) and spectrum re-growth problems. Thus, the digital pre-distortion (DPD) technique is used to improve the linearity of HPA. This paper proposes the adaptive DPD technique, which is composed of a look-up table (LUT) based adaptive update algorithm, for the compensation of HPA nonlinearity. From the simulation results, the proposed technique shows the better convergence speed and spectrum re-growth suppression compared with conventional LUT technique.


Lee D.,Broadcast Technical Research Institute
International Conference on Advanced Communication Technology, ICACT | Year: 2010

The viewer's behavior of contents consumption is changing from passive to active due to the progress of internet. Since the television is able to support some sort of restricted internet service through digital television and internet technology, the TV broadcasters can respond the viewer's active behavior. In Korea, TV broadcasters prepare OHTV(Open Hybrid TV) service which combines terrestrial DTV and internet together for the analog TV switch off in 2012, providing terrestrial DTV viewers with various contents and bidirectional interactive service. Also, broadcasters and TV manufacturers cooperate to make OHTV standard in authorized standardization organization for equivalent marketing opportunity.

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