Hand-raising detection device, non-transitory computer readable medium, and hand-raising detection method

A hand-raising detection method comprising:

• performing conversion of a non-overhead view image of a real-world predetermined space including a real-world person into an overhead view image by using a result of three dimensional measurement performed on the predetermined space;
• and
• detecting a hand-raising action by using a silhouette image of the person in the overhead view image resulting from the conversion by:
• determining an area of an ellipse that is fitted to the silhouette image of the person in the overhead view image,
• determining an area of the silhouette image of the person in the overhead view image,
• determining an area ratio between the area of the ellipse that is fitted to the silhouette image of the person and the area of the silhouette image of the person, and
• determining that the hand-raising action is detected by comparing the determined area ratio to a predetermined threshold.

A hand-raising detection device comprising:

• a processor that executes a program that:
• performs conversion of a non-overhead view image of a real-world predetermined space including a real-world person into an overhead view image by using a result of three dimensional measurement performed on the predetermined space;
• and
• performs detection of a hand-raising action by using a silhouette image of the person in the overhead view image resulting from the conversion, by
• determining an area of an ellipse that is fitted to the silhouette image of the person in the overhead view image,
• determining an area of the silhouette image of the person in the overhead view image,
• determining an area ratio between the area of the ellipse that is fitted to the silhouette image of the person and the area of the silhouette image of the person, and
• determining that the hand-raising action is detected by comparing the determined area ratio to a predetermined threshold.