3D DCT based volumetric three dimensional video data compression method
A three dimensional discrete cosine transform(3D DCT) based volumetric three dimensional video data compression method was proposed in order to solve the problem of huge volumetric three dimensional video data.The method combines 3D DCT and three dimensional motion estimation.The 3D DCT was adopted to exploit spacial redundancies in a volumetric frame.A fast three dimensional cube matching algorithm was proposed in motion estimation in order to reduce temporal redundancies between adjacent volumetric frames.A half voxel search algorithm was employed in order to improve the precision of cube matching.A quantitative method for intra frame and inter frame cube was proposed,and the quantified DCT coefficients were organized by a three dimensional zigzag scan.The 3D DCT coefficients were coded by a run length/adaptive arithmetic encoding system.Experimental results showed that the method outperformed JPEG2000 for sequences with slow motion,while the performance of the method was worse than JPEG2000 at high bitrates for sequences with drastic motion.The method gained 2 dB in average peak signal to noise ratio compared with the 3D DCT based static volumetric image compression method.