Silicon Integrated Systems Corporation

Chien-Hsiu Huang

Hung-Ta Pai

Ching-Mei Huang

A TV decoder. The decoder comprises a converter producing a plurality of first bits by sampling a base-band TV signal within a sampling period, and transmitting the first bits in groups, wherein the first bits in each one of the groups undergo parallel transmission through a plurality of first signals, and a demodulator receives the first bits and produces a plurality of second bits controlling the first signals, wherein the second bits are sequentially transmitted through a second signal input to the converter.

TV decoder

A VGA to TV data transformation system uses a background-based adaptive flicker reduction method. Information in a picture displayed on a screen of a monitor is divided as graphic and video information. Graphic information which includes cursor, graphic data, and sub-picture of video data in video information is prone to flicker. A background-based adaptive flicker reduction is applied to pixels in regions containing graphic information. A current pixel and the adjacent pixels directly above and below the current pixel are used to compute Mean and Diff values. The background state of a current pixel is determined by comparing the Mean value with a threshold value. The background state, the Mean value and the Diff value are then used to select a flicker reduction mode that may be strong reduction, median reduction, mild reduction or no reduction. An anti-flicker pixel is generated according to the flicker reduction mode.

Method and apparatus for VGA to TV data transformation using background-based adaptive flicker reduction

In an image scaling method and apparatus that uses adaptive edge enhancement, a plurality of sets of gradient threshold values and enhancement threshold values correspond respectively to predetermined enhancement modes. The enhancement mode corresponding to a mean pixel value for a one-dimensional pixel array that includes a center pixel to be updated and neighboring pixels of the center pixel is determined so that one of the sets of gradient threshold values and enhancement threshold values corresponding to the selected enhancement mode can be selected. After a sharpness value is computed by adding together absolute values of differences between values of the center pixel and each of the neighboring pixels, one of the enhancement threshold values in the selected set is selected by comparing the sharpness value with the gradient threshold values in the selected set. A sign of the selected enhancement threshold value is then determined such that difference between left side brightness and right side brightness is increased when the selected enhancement threshold value is added to the value of the center pixel.

Method and apparatus for image scaling using adaptive edge enhancement

An adaptive anti-flicker data conversion system for converting picture data in a video graphic adapter for displaying on a television. The conversion system reduces flickers adaptively according to the luminance of a pixel and neighboring pixels one line above and below. Contrast difference and mean value are defined based on the luminance of three neighboring pixels. A contrast ratio is computed by dividing the contrast difference by the mean value. Three threshold values are defined for examining the contrast ratio and selecting an appropriate anti-flicker filter. Pixels having higher contrast ratio are processed with filters having stronger anti-flicker effect. The adaptive anti-flicker method reduces flickers without blurring every pixel in the picture data.

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Hsinchu, Taiwan

Chien-Hsiu Huang