A high-voltage power supply comprises the following components. The indexing method includes the steps of determining whether at least one cell, on which feature vectors are concentrated, exists, and hierarchically indexing the feature vector data space when it is determined that at least one cell, on which feature vectors are concentrated, exists in the step. The broadcast television signal contains data indicating that an item in the broadcast television signal is being offered for sale. The internationalization context is propagated to successive servers that further service the client’s request. This disclosure describes computing a mask map from a hybrid graph, segmenting the image into a foreground object and a background, and displaying the foreground object from the background.