Image position inspecting apparatus, computer-readable medium and image forming apparatus

An image position inspecting apparatus, comprising:

• a reading unit that includes light receiving elements arranged with a reading resolution Rs in a main scanning direction crossing a conveying direction of a recording media and that reads an inspection image formed on the recording media one pixel by one pixel at intervals of the same number of pixels along the main scanning direction, a resolution of the inspection image being Rp;
• a computer that generates a profile along a main scanning direction of the inspection image based on the inspection image read by the image reading unit;
• and
• a computer that acquires a position of the center of gravity of the pixels of the inspection image with respect to the light receiving elements from the profile and that specifies a position of each of the pixels of the inspection image in the main scanning direction based on a phase difference, the phase difference being a deviation of the acquired position of the center of gravity of the pixels in the inspection image with respect to a light receiving center of the light receiving elements,
• wherein at least three pixels of the pixels neighboring each other in the main scan direction are opposed to at least three elements of the light receiving elements each of which comprises a sensing area having a predetermined width in the main scan direction, and
• the three pixels are opposed to the three elements at different positions within the predetermined widths of the sensing areas, respectively.