Samsung Electronics Co., Ltd.

Joong-Sun Yoo

Jong-Chul Choi

Jae-Jun Lee

Yeon-mo Jeong

Chang-Wan Hong

Yeon-Mo Jeong

Ju-Soon Hong

A scan format converter for converting a video format by bi-sigmoid interpolation. In the scan format converter, a memory controller has a look-up table at which first and second displacement values for pixel points of a video format to be converted are stored, controls transmission of color signals input from an external device, and reads the first and second displacement values for the pixel points of the color signals from the look-up table. A mode detector detects horizontal and vertical sync signals input from the external device and outputs a video format detection signal representing a mode of the currently input video format to the memory controller. A memory temporarily stores the color signals. A color signal logic circuit has a plurality of bi-sigmoid interpolation tables at which sigmoid interpolation values according to a color signal level difference between two pixel points are stored, and bi-sigmoid-interpolates the color signal levels of the input pixel points with respect to an x-axis and a y-axis according to the first and second displacement values input from the memory controller. A sync generator generates a sync signal to the color signal logic circuit.

Method for making look-up tables for video format converter using the look-up tables

A video format mode detector for detecting the format mode of a video signal transmitted from a video data output device such as personal computer, which includes a counter for counting a horizontal synchronous signal input during one cycle of a vertical synchronous signal separated from the video signal, generating positive counting data and negative counting data, a data holder for holding the output from the counter whenever the horizontal synchronous signal separated from the video signal is applied thereto, a data adder for adding up positive holding data and negative holding data sent from the data holder whenever the horizontal synchronous signal is applied thereto, generating data which indicates the number of horizontal lines corresponding to one cycle of the vertical synchronous signal, a data comparator for comparing the positive holding data and negative holding data with each other, outputting data having the smaller value, and a mode discrimination part for searching an ROM included therein, generating a video format mode detection signal corresponding to the data sent from the data adder and data comparator.

Video format mode detector

Growing community of inventors

Kyonggi-do, South Korea

Joong-Sun Yoo