Image processing system

An image processing system comprising:

• an input device configured to input an image including an extraction target in accordance with a user's imaging operation, wherein the extraction target contains breakage or a wrinkle;
• and
• circuitry configured to:
• detect a section of the image, wherein the section corresponds to the extraction target;
• generate a polygonal convex hull of the detected section;
• acquire a polygon having a preset number of vertices from the generated convex hull by repeating a vertex reducing process, wherein an elimination target vertex is eliminated from the convex hull during the vertex reducing process based on an interior angle at the elimination target vertex, to obtain the polygon, and wherein the vertex reducing process comprises:
• determining a first side based on an area of a region in the generated convex hull, wherein the region is surrounded by the first side, a second side, a third side, a fourth side and a fifth side, wherein the first side passes through the elimination target vertex, wherein the second side and the third side generates the elimination target vertex, wherein the fourth side extends from a sixth side which is adjacent to the second side, and wherein the fifth side extends from a seventh side which is adjacent to the third side;
• and
• generating the polygon after elimination of the elimination target vertex, wherein the polygon comprises the first side, the fourth side, the fifth side, the sixth side and the seventh side;
• and
• extract a portion from the image based on the acquired polygon;
• and
• an output device configured to output a signal indicating the portion.