QUESTION 4 Intraframe and Interframe compression methods are used by video compression algorithm to exploit both the spatial and temporal redundancies. (a) Distinguish the operation between Intraframe and Interframe compression methods. Clearly illustrate your answers for both compression methods with the aid of block diagrams. Briefly explain your block diagrams. [12 marks] (b) Briefly explain the Mean Square Error (MSE) operation and the required number of arithmetic operation (OP) per matching when minimum MSE is used as macroblock matching criterion with full search during the Interframe compression. (5 marks) o Block matching based motion estimation can be easily implemented into the hardware. However, the motion introduced by the real world object cannot be guaranteed always fall into the same macroblock and subjected to only a single motion. Critically discuss the cost and mitigation of implementing block matching with variable block size (relate your answer to Q4(b)). [3 marks)