Image correction apparatus, overhead image reading apparatus, image correction method, and program

An image correction method comprising:

• acquiring read image data generated by an imaging device that moves in a sub-scanning direction with respect to a reading medium irradiated with an environmental light to read the reading medium;
• selecting a correction filter for correcting a pixel of interest in the acquired read image data based on brightness or luminance component of a pixel including the pixel of interest in a plurality of determination filters in which number of pixels to be used in the sub-scanning direction differs;
• and
• correcting tone data of the pixel of interest based on the correction filter selected by the selecting.

A non-transitory computer readable storage medium storing therein a program for an image correction method, the method comprising:

• acquiring read image data generated by an imaging device that moves in a sub-scanning direction with respect to a reading medium irradiated with an environmental light to read the reading medium;
• selecting a correction filter for correcting a pixel of interest in the acquired read image data based on brightness or luminance component of a pixel including the pixel of interest in a plurality of determination filters in which number of pixels to be used in the sub-scanning direction differs;
• and
• correcting tone data of the pixel of interest based on the correction filter selected by the selecting.