Taiwan Imagingtek Corporation

Shi-Ho Tien

Chih-Ta Star Sung

Yin-Chun Blue Lan

Bey-Yun Kuo

The differential value of the adjacent pixels is calculated firstly and is coded by a VLC coding. The VLC coding includes codes representing the Quotient and Remainder with a marker bit inserted in between. The divider is predicted with no code in the coded data stream. If three pixel components are presented in the same clock time, three VLC encoders and three VLD decoders are applied to encode and decode one pixel at a time. During encoding, both Remainder and Quotient of the same pixel component are encoded in parallel followed. During decoding, both Remainder and Quotient of the same pixel component are decoded in parallel and the results of the first pixel component are used a reference to decode the second pixel component which adopts the same decoding procedure and the decoded results of the second pixel component is used as reference to decode the third pixel component.

Method and circuit of high performance variable length coding and decoding for image compression

The present invention provides method of a variable length coding for data compression. The first coding algorithm is applied to encode the data with the value less than half of the calculated divider and another coding algorithm encoding the subtracted value of the data. Another algorithm applies at least two predetermined 'marker bits' to indicate the range of data with concatenated binary code encoding the shifted value of the data. Another algorithm deciding the boundary separating the first range and other ranges of the data and encode the data by applying at least two different algorithms accordingly.

Growing community of inventors

Hsinchu, Taiwan

Shi-Ho Tien