The Grand Alliance HDTV Proposal in data compression

When the Federal Communications Commission (FCC) requested proposals for the HDTV standard, they received four proposals for digital HDTV from four consortia. After the evaluation phase, the FCC declined to pick a winner among the four, and instead suggested that all these consortia join forces and produce a single proposal. The resulting partnership has the … Read more

The MPEG – 2 Video Standard -— H . 2 6 2 in data compression

While MPEG-1 was specifically proposed for digital storage media, the idea behind MPEG-2 was to provide a generic, application-independent standard. To this end, MPEG-2 takes a “tool kit” approach, providing a number of subsets, each containing different options from the set of all possible options contained in the standard. For a particular application, the user … Read more

Rate Control in data compression

The binary codewords generated by the transform coder form the input to a transmission buffer. The function of the transmission buffer is to keep the output rate of the encoder fixed. If the buffer starts filling up faster than the transmission rate, it sends a message back to the transform coder to reduce the output … Read more

Motion Compensation in data compression

Motion compensation requires a large amount of computation. Consider finding a matching block for an 8×8 block. Each comparison requires taking 64 differences and then computing the sum of the absolute value of the differences. If we assume that the closest block in the previous frame is located within 20 pixels in either the horizontal … Read more