H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/48
H04N 5/217 (2006.01) H04N 1/40 (2006.01) H04N 1/401 (2006.01)
Patent
CA 2011326
The shading correction is performed with respect to a signal "A" indicative of the image density read by an optical read device in accordance with a reference signal "B". Both the signals "A" and "B" consist of n bits. An inputted signal having an initial value "A" is doubled by a multiplier when A?B and B?0. A subtracter subtracts the reference signal "B" from a signal "X" outputted from the multiplier and discriminates whether or not a signal "X-B" is negative. An S/P conversion register doubles an inte- grated value "S" having an initial value "0" and changes the integrated value from "S" to "2S" when the signal "X-B" is negative. In contrast, when the signal "X-B" is not nega- tive, the S/P conversion register adds "1" to "2S" and changes the integrated value from "S" to "2S+1". The signal "X" outputted from the multiplier is again inputted into the multiplier when the signal "X-B" is negative. Alternative- ly, the multiplier receives the signal "X-B" outputted from the subtracter when the signal "X-B" is not negative. The above procedure is repeated n times. The last integrated value outputted from the S/P conversion register is equal to or approximately equal to a value obtained by an expression "S=A(2n-1)/B", and therefore, the former can be regarded as a shading correction signal.
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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