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Compression ratio means the amount of compression in order to coding a raw data, in other words when we say the compression ratio is 25:1 it means that the size of coded stream is 1/25 of the original one, in such case you can convert a 100kB file to a 4KB one,
About the DCT, because DCT coefficients are fractional and not integer, so there is loss when we do inverse DCT, but I thinks the amount of loss is negligible.
Hi Amith, Compression Ratio: Thecompression ratio[/colo] is a single number that can be used to predict the performance of any internal-combustion engine. It is a ratio between the volume of a combustion chamber when the piston is at the bottom of its stroke, and the volume when the piston is at the top of its stroke. The higher the compression ratio, the more mechanical energy an engine can squeeze from its air-fuel mixture. Higher compression ratios, however, also make detonation more likely.