PROBLEM TO BE SOLVED: To provide a measurement system for a biological activity attributed to the respiration in which a measurement condition for a biological activity is hardly affected by a surrounding environment.SOLUTION: A measurement system includes a light source 20, an imaging device 10 for generating a video image, and an image processing circuit for measuring a biological activity of a subject using the video image. A reflection marker 40 is disposed at a position where a body motion accompanying the respiration of the subject is generated. When a light is emitted toward the subject from the light source 20, the imaging device 10 receives the light reflected by the reflection marker 40 and generates a video image. The image processing circuit receives the video image from the imaging device 10, and measures the biological activity attributed to the respiration of the subject based on a change in a luminance value of a plurality of frame images. The reflection marker 40 includes a base 41 with a flat supporting surface 41a, and a plurality of reflection materials 42, each of which is inclined toward the same inclination direction at a predetermined inclination angle with respect to the supporting surface 41a, and is supported by the supporting surface 41a.SELECTED DRAWING: Figure 3COPYRIGHT: (C)2017,JPO&INPIT【課題】生体活動の計測条件が周囲の環境の影響を受けにくい、呼吸に起因する生体活動の計測システムを提供する。【解決手段】計測システムは、光源20と、動画像を生成する撮像装置10と、動画像を利用して被験体の生体活動を計測する画像処理回路と備える。被験体の呼吸に伴う体動の発生位置に反射マーカ40が配置され、光源20から、被験体に向けて光が放射されたときにおいて、撮像装置10は、反射マーカ40で反射された光を受けて、動画像を生成し、画像処理回路は、撮像装置10から動画像を受け取り、複数のフレーム画像の輝度値の変化に基づいて被験体の呼吸に起因する生体活動を計測する。反射マーカ40は、平坦な支持面41aを有するベース41と、各々が同一の傾斜方向を向いて支持面41aに対して所定の傾斜角度で傾斜し、支持面41aで支持された複数の反射材42と、を有する。【選択図】図3
