DFT yog qhov sib txawv ntawm Fourier Transform (ua tiav hauv computer). DCT yog qhov discrete cosine transform, uas yog, DFT thaum noj tsuas yog qhov tiag. FFT tsis yog qhov kev hloov pauv hloov pauv: nws tsuas yog qhov nrawm nrawm los siv qhov hloov pauv thaum N=2^k.
Puas DCT yog Fourier transform?
Tshwj xeeb, DCT yog a Fourier-hais txog kev hloov pauv zoo sib xws rau qhov tsis sib xws Fourier hloov pauv (DFT), tab sis siv cov lej tiag tiag.
Vim li cas DFT zoo dua DCT?
DCT nyiam dua DFT hauv cov duab compression algorithms zoo li JPEG > vim DCT yog qhov hloov pauv tiag tiag uas ua rau tib tus lej tiag tiag ntawm > cov ntaub ntawv taw qhia. Nyob rau hauv sib piv, ib tug DFT ua rau ib tug complex tooj (tiag tiag thiab > xav txog tej yam) uas yuav tsum tau muab ob npaug rau lub cim xeeb cia.
Puas yog DCT zoo dua KLT Vim li cas?
Dhau li ntawm, DCT muaj lwm yam khoom tseem ceeb uas yog nws qhov sib npaug asymptotic rau qhov zoo tshaj plaws KLT [1]. Yog li DCT tuaj yeem ua tiav qhov kev sib raug zoo ntawm kev suav cov complexity, thiab coding compression. Yog li ntawd, rau kev siv nyiaj txiag ruaj khov, DCT ua tau zoo dua KLT
Vim li cas peb thiaj siv DFT hloov FFT?
Lub Fast Fourier Transform (FFT) yog qhov kev siv ntawm DFT uas ua rau yuav luag zoo ib yam li DFT, tab sis nws yog ua tau zoo heev thiab nrawm duauas feem ntau txo. lub sij hawm xam qhov tseem ceeb. Nws tsuas yog kev suav cov algorithm siv rau kev suav ceev thiab ua tau zoo ntawm DFT.
