Optical EngineeringLossy coding technique for digital holographic signal
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We propose an efficient coding method of digital holograms (or fringe patterns) using standard compression tools for video and image. The fringe pattern is generated by a computer-generated hologram (CGH) algorithm with both an object image and its depth information. The proposed coding consists of preprocessing to separate RGB color space components, localization by segmenting the fringe pattern, frequency transform using M×N (segment size), 2-D discrete cosine transform (DCT) for extracting redundancy, segment scanning the segmented fringe pattern to form a video sequence, classification of coefficients, and hybrid video coding, which uses MPEG-2/4, H.264/AVC, differential pulse code modulation (DPCM), and lossless coding. The proposed algorithm illustrates that it has better properties for reconstruction, from four to eight times higher compression rate than previous research.