QUESTION 3 (a) What is the difference between I-Frames, P-Frames and B-Frames? [3 marks] (b) A video conference application uses digital video with resolution of 800 500 and frame rate of 30 frames/sec. Determine the minimum chroma subsampling configuration to stream the video conference in real time using a wired broadband with maximum bandwidth of 120 Mbps. Justify your answer. [11 marks] (c) Motion compensation is an important step in video compression. Assume that 2 x 2 macroblock is used and the target frame and reference frame is shown in Figure Q3(c)(i) and Q3(c)(ii), respectively. Calculate the difference macroblock that would be coded after finding the matching macroblock from motion compensation. You may choose either to use Mean Squared Error (MSE), Sum Absolute Difference (SAD) or Mean Absolute Difference (MAD) in your calculation. [11 marks] # # # # # # 6 3 3 2 # # Figure Q3(c)(i) # # # # 5 1 4 3 3 6 4 7 5 3 2 3 Figure Q3(c)(ii) 2 3 3 3