Hologram apparatus and method thereof

A hologram reconstruction apparatus, decoding hologram data in a hologram recording medium, and comprising:

• an optical detector, detecting reconstructed page data according to the hologram data and a reference beam;
• a candidate selector, coupled to the optical detector, computing a Hamming distance between the reconstructed page data and each candidate page data, and outputting the candidate page data when the Hamming distance is less than a predetermined Hamming distance threshold;
• a best-codeword selector, coupled to the candidate selector, estimating an Euclidian distance between each outputted candidate page data and the reconstructed page data, and determining a minimum Euclidian distance thereof;
• and
• a message generator, coupled to the best codeword selector, outputting a message data corresponding to the outputted page candidate data with the minimum Euclidian distance.

A holographic modulation method, modulating 1-dimentional data into 2-dimentional data to generate hologram data to be recorded on a hologram recording medium, and comprising:

• a spatial light modulator receiving m-bit data to only determine a (p×q) block comprising ON-pixels less than OFF-pixels;
• the spatial light modulator receiving a coherent light beam to modulate with the (p×q) block to generate a signal beam;
• and
• a Fourier lens focusing the signal beam on the hologram recording medium, so that when the focused signal beam and a focused reference beam is modulated together, the hologram data is generated to be recorded on the hologram recording medium.