Phase component compression for computer-generated holograms using modified JPEG-LS prediction

This paper explores a compression method for the phase component of computer-generated hologram (CGH) data. The proposed method utilizes the framework of JPEG-LS which is an international standard for lossless image compression. The phase component can be regarded as a signal distributed on the unit circle. However, its image representation introduces discontinuities around values of 0 and 2π, even though these values are adjacent on the circle. Such discontinuities significantly degrade coding efficiency when conventional image compression techniques are applied. To address this issue, we modify the MED predictor used in the JPEG-LS standard to accommodate the discontinuous nature of the phase component.