G - Physics
06
K
354/70, 352/82.2
G06K 9/38 (2006.01) G06K 9/60 (2006.01) H04N 1/407 (2006.01)
Patent
CA 2016429
In a reader in which quantity of light emitted from a light source to be turned on in response to a lighting signal from a control circuit and reflected by an original document or transmitted through the original document is read by a solid image sensor receiving a clock signal from the control circuit so as to be converted into an analog signal such that the analog signal is converted by an A-D converter into a digital image signal having a predetermined number of bits, the improvement comprising: a level adjusting means for adjusting a white level of the analog signal to a reference white level, which is provided in the control circuit; the level adjusting means output- ting, at the time of adjustment of the reference white level prior to reading of the original document, the clock signal for increasing or decreasing a period for storing electric charge in the solid image sensor such that a value of the analog signal which is read from the original document ought to have the reference white level and is inputted to the A-D converter is converted into a full-range digital image signal by the A-D converter.
G. Ronald Bell & Associates
Sharp Kabushiki Kaisha
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