4) Referring to the following block diagram: a) Explain motion compensation (4 Marks). b) Explain VLC (3 Marks). c) DCT and Quantization shown in the dashed box (3 Marks). Current frame Ref/Rec frame Frame buffer Motion estimation Motion compensation Conversion from YUV to RGB Texture coding DCT Texture update IDCT Quanti- zation Inverse quantization DCT Discrete cosine transform IDCE Inverse DCT VLC: Variable length coding VLC