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 |
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.
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