A picture of boy and girl. The bridge in Vancouver: (a) Original [Courtesy of Minhuai Shi]. Christmas in Winorlia: (a) Original. Two-dimensional (2-D) view of xvYCC. Gamut coverage of sRGB, sYCC, and xvYCC color spaces. (a) An example of progressive video and (b) an example of interlaced video. Block diagram of H.264 encoder. Comparison on reference frames between MPEG-2=4 with H.264. An example to explain the benefit by using multiple reference frames, it is noted that the better reference can be obtained by using multiple reference pictures for the video sequences with periodic changes.