2What is Compression?•Compression is a process of converting data into a form requiring less spaceto store or less timeto transmit, which permits the original data to be reconstructed with acceptable precision at a later time.Orange Juice Analogy!•Freshly squeezed orange juice (uncompressed)•Remove water (redundancy), convert it to concentrate (encoding)•Shipped, stored, and sold.•Add water to concentrate (decoding), tastes like freshly squeezed!!!
3Why is compression necessary?•Storage space limitations•Transmission bandwidth limitations.Resolution•QCIF: 180 x 144•MPEG: 352 x 288•VGA: 640 x 480•NTSC 720x486•Workstation 1280x1024•HDTV: 1920 x 1080•35mm slide: 3072 x 2048
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