Image processing apparatus, image processing method, and image processing system

The invention provides an image processing apparatus. Provided is an image processing apparatus including an image information acquiring unit that acquires image information of an image, a position information acquiring unit that acquires position information of a containing region input by a user so as to contain a designated region that is a specific image region in the image, a first representative position setting unit that sets a first representative position that is a representative position of the designated region based on the position information of the containing region, a second representative position setting unit that sets a second representative position that is a representative position of a region-outside-designated-region that is a region outside the designated region, and a region detection unit that detects the designated region based on the first representative position and the second representative position.