Stroke information measuring instrument and stroke information measuring method

A stroke information measuring device which captured images of a swimmer during swimming by using an imaging means and measures the stroke information of the swimmer based on the image data obtained, the stroke information measuring device comprising:

• a pixel extracting means for extracting pixels corresponding to the image of the body of the swimmer in each image data obtained;
• a profile data generating part for performing the integration of the pixels corresponding to the image of the body extracted by the pixel extracting means in a predetermined direction and generating the profile data corresponding to the body image;
• an end point extracting means for extracting an end point of the body image from the profile data;
• and
• a stroke point extracting means for extracting a stroke point as the end point corresponding to the predetermined posture of the swimmer who is swimming based on the periodic movement of the end point.