发明名称 画像読取装置、画像形成装置、増幅率の調整方法およびプログラム
摘要 PROBLEM TO BE SOLVED: To provide devices and a method which can set an optimum gain in a short time even when white flaws and the like occur in a reference white board.SOLUTION: An image reading device comprises: reading means for optically reading a manuscript to output an analog image signal; first amplification means for amplifying the analog image signal based on a first gain; conversion means for converting the analog image signal to digital image data; second amplification means for amplifying the digital image data based on a second gain; detection processing means for reading a reference image and detecting a peak value from signal levels of a plurality of lines of the amplified digital image data and calculating an average value by averaging the signal levels of the plurality of lines; and control means for calculating the first gain such that the peak value becomes a predetermined target value and setting the calculated value to the first amplification means, and calculating the second gain by using the peak value, the average value, a peak value detected and an average value calculated by re-reading the reference image after setting of the first gain, and the target value and setting the calculated second gain to the second amplification means.
申请公布号 JP6044126(B2) 申请公布日期 2016.12.14
申请号 JP20120136742 申请日期 2012.06.18
申请人 株式会社リコー 发明人 橋本 英樹;中澤 政元
分类号 H04N1/19;G06T1/00;H04N1/401 主分类号 H04N1/19
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