The features of three video technologies for Windows system,i. e., GDI, DrawDib
function set and DirectDraw, are briefly introduced. The theory and implementation methods of
image zoom through sampling rate conversion are also introduced. The executive efficiencies of the
three video technologies are compared, and the effect of the up-conversion images produced by these
technologies for Windows is compared to that by software interpolation algorithm. And some
experimental conclusions are presented
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