Transform coding is a type of data compression for `natural` data like audio signals or photographic images. The transformation is typically lossy, resulting in a lower quality copy of the original input. In transform coding, knowledge of the application is used to choose information to discard, thereby lowering its bandwidth. The remaining info.....
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http://en.wikipedia.org/wiki/Transform_coding
a method of source coding in which each picture is divided into sub-pictures, a linear transform is performed on each sub-picture signal, and then the resulting signal is converted into a digital signal NOTE - The most common form of transform coding uses a discrete transform, most often a discrete cosine transform (DCT), and results in a sequence ...
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=723-10-51
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