Image processing apparatus, image processing method and medium storing program for distortion correction

An image processing method, comprising:

• acquiring photographed image data which is generated by photographing, in an imaging apparatus, a photographed object indicating multiple reference points arranged regularly, the photographed image data indicating a photographed image of the photographed object;
• acquiring pieces of position information which indicate positions of the multiple reference points in the photographed image by use of the photographed image data;
• mapping pieces of relative information to the respective reference points by analyzing relative positional relations between the multiple reference points in accordance with a first method using the pieces of position information, the relative information indicating the relative positional relations between the multiple reference points;
• mapping the pieces of relative information to the respective reference points by analyzing the relative positional relations between the multiple reference points in accordance with a second method using the pieces of position information;
• determining a certain reference point as a reference point to be excluded, in a case that a first mapping relation between the certain reference point and one of the pieces of relative information mapped in accordance with the first method is different from a second mapping relation between the certain reference point and the one of the pieces of relative information mapped in accordance with the second method;
• and
• generating position data which includes the pieces of position information of reference points, among the multiple reference points, as output targets, based on mapping relations between the reference points as the output targets and the pieces of relative information, the reference points as the output targets being two or more reference points which are mapped to the pieces of relative information, the reference points as the output targets not including the reference point to be excluded.

An image processing apparatus, comprising a processor and a memory configured to store instructions,

• wherein the instructions, when executed by the processor, cause the image processing apparatus to:
• acquire photographed image data which is generated by photographing, in an imaging apparatus, a photographed object indicating multiple reference points arranged regularly, the photographed image data indicating a photographed image of the photographed object;
• acquire pieces of position information which indicate positions of the multiple reference points in the photographed image by use of the photographed image data;
• map pieces of relative information to the respective reference points by analyzing relative positional relations between the multiple reference points in accordance with a first method using the pieces of position information, the relative information indicating the relative positional relations between the multiple reference points;
• map the pieces of relative information to the respective reference points by analyzing the relative positional relations between the multiple reference points in accordance with a second method using the pieces of position information;
• determine a certain reference point as a reference point to be excluded, in a case that a first mapping relation between the certain reference point and one of the pieces of relative information mapped in accordance with the first method is different from a second mapping relation between the certain reference point and the one of the pieces of relative information mapped in accordance with the second method;
• and
• generate position data which includes the pieces of position information of reference points, among the multiple reference points, as output targets, based on mapping relations between the reference points as the output targets and the pieces of relative information, the reference points as the output targets being two or more reference points which are mapped to the pieces of relative information, the reference points as the output targets not including the reference point to be excluded.