ZPAV (H.265) is audio-visual codec protocol, very different from H264/MPEG4, ZPAV (H.265) basic algorithm is wavelets, SPIHT, BSW, MMW, ...... ZPAV (H.265) basic algorithm : 1, analysis/synthesis : wavelets 2, denoise : GCV (general

Another advantage is that geometric properties of the curve are easily determined from a particular level set of the surface . For example, the normal vector for any point on the curve C is given by: