US 7,321,451 B2
Data converting circuit, data converting method, and image forming apparatus
Shunichi Ono, Tagata-gun (Japan); and Hidenori Kobayashi, Sunto-gun (Japan)
Assigned to Kabushiki Kaisha Toshiba, Tokyo (Japan); and Toshiba Tec Kabushiki Kaisha, Tokyo (Japan)
Filed on Mar. 19, 2003, as Appl. No. 10/390,642.
Prior Publication US 2004/0186919 A1, Sep. 23, 2004
Int. Cl. G06K 15/00 (2006.01); G06K 13/28 (2006.01); G06F 13/00 (2006.01)
U.S. Cl. 358—3.23  [710/25; 710/3] 4 Claims
OG exemplary drawing
 
1. A data converting circuit which receives 8 bit input data and converts the 8 bit input data into 10 bit output data, comprising:
a group select circuit which receives the 8 bit input data, compares the 8 bit input data with boundary information stored in advance, and in accordance with a result of the comparison, selects the 8 bit input data as one of a plurality of groups and outputs a group select signal;
a first multiplexer which receives the group select signal from the group select circuit and outputs most significant 2 bit data corresponding to most significant 2 bits of the 10 bit output data;
an output data table which stores in advance a least significant 8 bit data group corresponding to least significant 8 bits of the 10 bit output data; and
a second multiplexer which receives the 8 bit input data and selectively outputs a least significant 8 bit data group stored in the output data table and corresponding to the least significant 8 bits of the 10 bit output data.