Patent ID: 7715072

Claim:
A method for searching holograms to determine the address of a target data page recorded in a holographic recording medium, the method comprising the steps of: emitting a signal beam; modulating the signal beam, by a spatial light modulator, using a search data page having a plurality of equally divided data blocks, at least one of the data blocks of the search data page consisting of an encoded search image; irradiating the modulated signal beam onto the holographic recording medium having digital information encoded in a plurality of data pages multiplexedly recorded thereon, each data page having a plurality of equally divided data blocks, to transmit one or more diffracted beams; receiving the one or more diffracted beams emitted from the holographic recording medium in response to the modulated signal beam; detecting a target diffracted beam having a maximum intensity of the one or more diffracted beams; and determining an address of the target diffracted beam as the address of a target data page that comprises an encoded target data image matching the encoded search image, wherein the recorded data pages have data blocks comprising data images encoded by an encoding method that provides a same number of ON pixels.