The holographic stereogram approach is used to calculate computer generated holograms fast. If we use computer graphics (CG) for 2-D picture array of the stereogram, fast computation of CG also becomes important. In this paper, we discussed improvements of computational speed to generate the CG array. In our previous method, each CG was calculated independently. Since the viewing point of the CG array changes horizontal direction only, many part of the CG calculation can be done only once for the CG array. In addition, decreasing intermediate file input/output also reduces total computation time.
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