Abstract: An imaging lighting instrument for an operation is disposed in a space between an operator's head and a patient, thereby configuring a multi-viewpoint video capturing device for a surgical operation in which blocking of a light by the operator's head or body and appearance of the head in a video are avoided. The imaging lighting instrument includes a plurality of cameras and a plurality of lights attached to a hollow ring-shaped or arc-shaped housing made of a wire member of a finite length, which is devised so as not to interfere with the visual field or work of the operator. Furthermore, the multi-viewpoint video capturing device is configured to have a function of estimating the context of the plurality of cameras and make it possible to perform operation support/recording of a direct-view surgical operation by using a multi-viewpoint video by adding a video information processing function for selecting a camera video in which an operators' hand or surgical instruments less appear in an image.

Abstract: In a calibration apparatus (10), an acquisition unit (11) acquires a plurality of positions in an image plane respectively corresponding to a plurality of body region points distributed over a whole body of a person in each of a plurality of photographed images obtained by photographing a common photographing area by a plurality of cameras at the same time arranged at positions different from each other and including images of a same person. A camera parameter calculation unit (12) calculates camera parameters of the plurality of cameras using the plurality of positions in the image plane acquired by the acquisition unit (11) as image feature points.