Information processing method and apparatus, and recording medium

An information processing method of setting one of an internal parameter and an external parameter of a camera, comprising:

• acquiring a picked-up image obtained by picking up a calibration pattern in which white pattern elements and white-and-black pattern elements are arranged on a plane using the camera, each of the white pattern elements having a bright closed area in a dark background area, each of the white-and-black pattern elements having a bright closed area and a dark closed area inside the bright closed area;
• obtaining a white continuation area and a black continuation area by binarizing the picked-up image;
• judging between the white pattern elements and the white-and-black pattern elements in the picked-up image based on the white continuation area and the black continuation area which are obtained;
• and
• setting one of the internal parameter and the external parameter of the camera by associating the pattern elements in the picked-up image with the pattern elements in a space based on an arrangement relationship between the white pattern elements and the white-and-black pattern elements which are judged.

An information processing method of setting one of an internal parameter and an external parameter of a camera, comprising:

• acquiring a picked-up image obtained by picking up a calibration pattern in which first pattern elements and second pattern elements are arranged using the camera, each of the first pattern elements being expressed by two closed areas having different brightness, each of the second pattern elements being expressed by one closed area;
• quantizing a signal expressing brightness in the picked-up image and detecting the first pattern elements and the second pattern elements based on a result of the quantization;
• associating the pattern elements in the picked-up image with the pattern elements in a space based on an arrangement of the first pattern elements shown by a result of the detection;
• and
• setting one of the internal parameter and the external parameter of the camera based on a result of the associating operation.

An information processing apparatus that sets one of an internal parameter and an external parameter of a camera, comprising:

• a calibration pattern in which first pattern elements and second pattern elements are arranged, each of the first pattern elements being expressed by two closed areas having different brightness, each of the second pattern elements being expressed by one closed area;
• an acquisition unit that acquires a picked-up image obtained by picking up the calibration pattern using the camera;
• a detecting unit that quantizes a signal expressing brightness in the picked-up image and detects the first pattern elements and the second pattern elements based on a result of the quantization;
• and
• a setting unit that sets one of the internal parameter and the external parameter of the camera by associating the pattern elements in the picked-up image and the pattern elements in a space based on an arrangement of the first pattern elements shown by a result of the detection.