Samsung Electronics Co., Ltd.

Chang-won Huh

Yong-in Han

Seong-deok Lee

Chang-yeong Kim

Suk-beom Song

Seok-Joon Park

Hyen-aee Woo

Provided is a progressive scan method used in a display using adaptive edge interpolation. According to the progressive scan method, a final edge direction that satisfies a first edge-determination condition and a second edge-determination condition is detected by performing interpolation for 7&#xd7;3 pixel windows, using code determination and a comparison of a standard deviation based on differences between luminances of pixel data divided by an edge boundary. As a result, directional edge interpolation is carried out in a region of a low gradient below 45&#xb0; and to 27&#xb0; at the minimum, and simple intra-field linear interpolation can be performed in a high-frequency texture region. Subsequently, it is possible to remove high-frequency noise introduced in edge dependent interpolation or unnatural screen display due to zigzagged edges, thereby improving the quality of a display.

Progressive scan method used in display using adaptive edge dependent interpolation

A method and apparatus for selectively enhancing contrast depending on the level of incoming video signals while preserving colors are provided. An apparatus for enhancing the contrast and brightness of a video signal displayed on a display device includes: a first luminance level transformation circuit that receives luminance and chrominance signals, reduces the level of the luminance signal in response to a first control signal, and outputs the chrominance signals and the luminance signal whose level has been reduced; an image converting circuit that receives the output signals from the first luminance level transformation circuit and converts the received signals into RGB video signals; and a second luminance level transformation circuit that receives the RGB video signals from the image converting circuit, concurrently increases the respective levels of the RGB video signals in response to a second control signal, and outputs the RGB video signals whose levels have been increased. It is desirable that the display device is a color display tube ('CDT'), a thin film transistor liquid crystal display ('TFT-LCD'), or a plasma display panel (&#x201c;PDP&#x201d;).

Adaptive contrast and brightness enhancement with color preservation

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Suwon, South Korea

Chang-won Huh