Abstract: A method for extracting features from an image for use in a computing device, the method comprising: producing Gaussian Scale Space (GSS) images in the type of a pyramid from the image inputted to the computing device; performing a Scale Normalized Laplacian Filtering on the GSS images; detecting interest points from the images that are subject to the Scale Normalized Laplacian Filtering; and extracting features of the image using the detected interest points.

Abstract: Provided is a visual search system. The visual search system according to an embodiment of the inventive concept may include a database that stores characteristic information for a visual search, and a visual search update server that updates the DB based on an image of a target captured by a moving object or a fixed object. According to an embodiment of the inventive concept, it is possible to efficiently update a DB for a visual search because images captured by not only the moving object but also the fixed object are used.

Abstract: A method for extracting features from an image for use in a computing device, the method comprising: producing Gaussian Scale Space (GSS) images in the type of a pyramid from the image inputted to the computing device; performing a Scale Normalized Laplacian Filtering on the GSS images; detecting interest points from the images that are subject to the Scale Normalized Laplacian Filtering; and extracting features of the image using the detected interest points.

Abstract: A method for retrieving an image based on a region of interest (ROI) includes: requesting an image retrieval server to retrieve candidate images corresponding to a query in a mobile communication terminal; retrieving the candidate images corresponding to the query in the image retrieval server to transmit the candidate images to the mobile communication terminal; designating an ROI on one of the received candidate images in the mobile communication terminal; converting the designated ROI image into a descriptor to request the image retrieval server to retrieve ROI-based images corresponding to the descriptor; retrieving the ROI-based images in the image retrieval server to transmit the ROI-based images to the mobile communication terminal; and displaying an image selected by a user among the transmitted ROI-based images in the mobile communication terminal.