Dong-Il Song

A new algorithm for interlaced to progressive scan conversion based on directional correlations and its IC design

Current TV systems suffer from uncomfortable visual artifacts such as edge flicker, interline flicker and line crawling, due to the inherent nature of the interlaced scanning process. Besides, the increasing demands of large TV screens have turned the problem of reducing visible line structures in a TV screen into an important issue. To lessen the visual affects of those artifacts, a technique known as an interlaced to progressive conversion (IPC) technique has been widely studied in various shapes. In the paper, the authors propose a new algorithm for interlaced to progressive conversion, referred to as a directional correlation dependent interpolation filtering (DIF) algorithm, which is composed of a correlation-dependent linear interpolation for a signal in the low horizontal frequency band and a line doubling method for a signal lying in the high horizontal frequency band. The DIF algorithm splits the horizontal frequency band of a given input 2D signal into two adjoint signals and applies two isolated interpolation schemes for the respective bands. In the algorithm, the authors develop a directional correlation dependent, interpolation technique depending on the spatial correlations between the spatially symmetric samples in the observation sliding window centered at the sample to be estimated. Computer simulations and the hardware implementation of the proposed algorithm to evaluate its performance are rigorously evaluated. The authors design a chip for luminance/chrominance interpolation with peaking process (YCIP) which has been tested with a real sequence of LDP images. >

A symbol timing recovery using the segment sync data for the digital HDTV GA VSB system

We propose a new technique of a symbol timing recovery (STR) using the segment sync data for the digital high definition TV (HDTV) Grand Alliance (GA) vestigial side band (VSB) system. An algorithm and a hardware structure for the proposed new technique provide very low complexity and fairly good performance. The proposed data segment sync detection and STR both work reliably at a signal to noise ratio (SNR) of 0 dB. The proposed STR has a tracking range for symbol frequency offset of /spl plusmn/100 ppm.

A new ghost cancellation system for Korean GCR

This paper describes a new ghost cancellation system built-in NTSC television based on the Korean ghost cancellation reference (KGCR) signal. The system has a highly integrated transversal filter, an unique circuit for control of the system and a high performance algorithm for calculating the filter coefficients. Laboratory and field test results confirm that the system is effective in canceling several combination of ghosts, which exist in real situations. >

Hybrid LCD panel system and its color coding algorithm

A color liquid crystal display (LCD) panel typically used in consumer products is composed of R, G, and B subpixels. Due to the subpixel structure and color microfilters, a single LCD panel system (SLPS) using such a panel has a low resolution, low brightness, and a poor appearance of the individual color pixel elements. These problems are solved by having a three LCD panel system (TLPS) which is composed of three black/white (B/W) LCD panels. However, this system requires high cost and high hardware (H/W) complexity. We propose a new LCD system using B/W and color LCD panels called the hybrid LCD panel system (HLPS) to overcome the drawbacks of other types of LCD panel applications. Also, the associated color coding algorithm for maximizing the effect of the proposed system is developed. In spite of using the simplified H/W structure, little visual difference has been attained in comparison with the TLPS in the terms of the resolution and brightness, and the color fidelity is better than the SLPS. Among the three types of the LCD projector, the 7.34% light utilization efficiency of the HLPS is the highest. Also, the HLPS is compact and relatively inexpensive.

Development of aspect ratio conversion system using scan-line video processor

We have developed an aspect ratio conversion (ARC) system using a scan-line video processor (SVP) for various types of NTSC signal; ARC algorithms were implemented by programming the SVP and an interlaced to progressive scan conversion (IPC) system was added using an ASIC chip.

VSB demodulator ASIC design and development for HDTV system

In this paper, we present ASIC design and implementation of vestigial sideband (VSB) demodulator for high definition television (HDTV) system employing the VSB modulation technique. We present three ASIC chips for VSB demodulator implementation.