Content-based shape retrieval (CBIR) using different shape descriptors

The shape is one of the most significant properties used in Content Based Image Retrieval (CBIR), however for a CBIR shape representation should satisfy several properties such as rotation invariance, robustness, in this article we are trying to study and combine two shape descriptors: the shape descriptor based on the area of MPEG-7, It is defined on a unit disk in polar coordinates and the shape descriptor based outline of MPEG-7 is based on the representation of the contour scale-space curvature (CSS).