Image processing system and image processing method

PROBLEM: To provide an image processing system and an image processing method each capable of easily determining an initial value of a parameter relating to character recognition in image processing of acquiring character information from an input image by character recognition. MEANS FOR SOLVING PROBLEM: An image processing system for acquiring character information from an input image includes: a first designation part that receives a setting of a measurement region with respect to a reference image obtained by imaging a target; a second designation part that receives a character format indicating a restricting condition of each character; a recognition part that performs character recognition to a partial image included in the measurement region in accordance with the character format; and a change part that changes a parameter of the character recognition in accordance with a result of the character recognition. The change part determines an initial value of the parameter by changing the parameter such that the result of the character recognition exceeds a predetermined probability.