| 摘要 |
In a document search and retrieval system, document images are segmented into layout objects. Each layout object identifies different structural elements in a document image. In addition, the system computes attributes and features for each segmented layout object. Before any document images are transmitted between a client and a server, users specify which document image attributes and features are most relevant to their browsing or searching tasks. Transmission (and/or display) of document images is then divided into two stages. During the first stage, those layout objects which are identified as having the specified features or attributes are transmitted at a first or high resolution; the remaining layout objects in an image are transmitted at a second or lower resolution (or in the form of bounding polygons). If the second stage is invoked, those remaining layout objects are re-transmitted at the first or high resolution. The second stage of transmission may be invoked when either a user request is received or when there is a system timeout.
|
