The observed reflectance features change, if they are put in scattering media. This phenomenon is caused by scattering of illuminated and reflected lights. The incident light from the light source scatters before it reaches at the surface of the object. Similarly, the reflected light scatters before it reaches at the camera. In this paper, we propose a new reflectance model which can express the interaction between the transmittance feature of the media and the reflectance feature of the object by taking the scattering of illuminated and reflected lights into account. Based on the reflectance model, the transmittance feature in the scattering media and the reflectance feature of the object are sequencially estimated by two steps using a reference object whose reflectance feature is known. We examined the validity of the proposed model by the simulation experiment. We also examined the accuracy of the estimation of the reflectance feature which takes into account the scattering in the media.%物休が散乱媒体中に置かれると，その見かけの反射特性は変化する.これは，光源からの照明光が物体に到達する前に散乱してしまうこと，および，物休表面での反射光がカメラに到達する前に散乱してしまうことが原因である.本研究では，この照明と反射の散乱を考慮し，散乱媒体の透過特性と物体表面の反射特性の相互作用を表現する反射モデルを新たに提案する.また，この反射モデルに基づいて，.反射特性が既知な参照物体を利用することで，散乱媒体の透過特性と物体表面の反射特性を2段階に分けて別々に推定する手法について述べる，シミュレーション画像と実画像を用いた実験により，モデルの妥当性と，散乱を考慮した反射特性推定の精度を検証した.
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