問題：
What is transform coding in MPEG?
答案：
a) A method of encoding a picture by dividing each picture into sub-pictures, performing a linear transformation on each sub-picture and then quantizing and coding the resulting coefficients.
b) The conversion of a signal from one domain to another, e.g., the conversion of two-dimensional picture samples into the frequency domain by means of DCT, which is used in MPEG.
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