Input device and image data calculation method

A method of calculating image data performed in an input device including

• an operation panel configured to receive an operation by at least one operating body located close to the operation panel;
• one or more electrodes arranged along the operation panel and spaced from the operation panel;
• and
• an image data calculation unit configured to calculate image data values, each of the image data values being calculated for a corresponding section of a plurality of sections defined on the operation panel virtually;
• wherein
• in each of the plurality of sections, at least a portion of the one or more electrodes are arranged in proximity to part of the operation panel;
• each of the image data values varies in accordance with an amount of electric charge charged in the corresponding section by a capacitance between the one or more electrodes in the corresponding section and the at least one operating body;
• each of the one or more electrodes includes a plurality of detection terminals;
• each of the plurality of detection terminals in said each of the one or more electrodes is connected to the image data calculation unit individually and separately;
• and
• the method comprises:
• detecting, for each of the detection terminals, a detection value varying in accordance with an amount of electric charge detected through a corresponding detection terminal of the detection terminals, and
• calculating the image data values based on a plurality of coefficient information values, each of the coefficient information values corresponding to one set of different sets of one of the sections and one of the detection terminals, and the each of the coefficient information values representing a ratio of an amount of electric charge detected through the detection terminal of the one set to an amount of electric charge charged in the section of the one set.