Image-reading apparatus

An image-reading apparatus that reads an image of an original comprising:

• an array sensor including photoelectric-conversion elements linearly arranged;
• an optical system configured to form the image of the original onto the array sensor;
• a signal-processing circuit configured to convert outputs of the array sensor into digital signals and sequentially output converted pixel values;
• a correction circuit configured to sequentially receive a line of the pixel values output from the signal-processing circuit and sequentially output corrected pixel values of the line at the same time, the line being divided into a plurality of sections;
• and
• a data table created by reflecting aberration characteristics of the optical system therein and including the number of output pixel values and a coefficient for each of the sections,
• wherein the correction circuit includes a shift register that temporarily stores a plurality of pixel values that are sequentially input and a calculation circuit that reads out a plurality of pixel values from the shift register and calculates and outputs corrected pixel values, and
• wherein each of the coefficients in the data table is an interval between positions on the input pixel line corresponding to the output pixel line in each of the sections, and correction operation for the corrected pixel values in the calculation circuit is performed on the basis of an accumulated value of the coefficients.