A New Algorithm for Trademark Image Retrieval Based on Sub-block of Polar Coordinates

The sub-block-based image retrieval method utilizes global and local image features to retrieve trademarks through separating individual an images into some blocks. This paper proposes a sub-block-based trademark image retrieval algorithm under the polar coordinate system. Experiment results show that our algorithm can keep excellent invariance in image translation, scaling and rotation and the retrieved results can satisfy human visual perception very well. Keyword: trademark retrieval, sub-block image, mirror invariant performance.