| 摘要 |
PROBLEM TO BE SOLVED: To provide an image reading device capable of reducing variance in gray level of an image read by using a gray reference member.SOLUTION: A control part calculates black-and-white difference data by subtracting first black data from white data, calculates the maximum value of black-and-white difference for all pixel in one line, and performs a maximum value calculation processing for obtaining a specified pixel position corresponding to the maximum value of black-and-white difference, a storing control processing for corresponding the maximum value of black-and-white difference with the specified pixel position, and storing into a storage part, a light gray data obtaining processing that obtains light gray data outputted from a converting When a light source radiates the part at the time of radiating a gray reference member by a maximum light amount value, a light gray black difference data calculation processing that calculates the light gray black difference data by subtracting second black data from the light gray data, gray-and-white ration calculation processing that calculates a gray-and white ration by dividing the maximum value of black-and-white difference into the light gray black difference data, and a correction value calculation processing that calculates reference data by multiplying the light gray data with a gray-and white ratio.SELECTED DRAWING: Figure 8 |
