Back Transformada discreta d'ondeta Catalan Diskrétní vlnková transformace Czech Wavelet-Transformation#Diskrete Wavelet-Transformation German تبدیل موجک گسسته Persian Ondelette#Transformée en ondelettes discrète French 離散ウェーブレット変換 Japanese 이산 웨이블릿 변환 Korean Transformada discreta de wavelet Portuguese Дискретное вейвлет-преобразование Russian 離散小波變換 Chinese

Discrete wavelet transform

An example of the 2D discrete wavelet transform that is used in JPEG2000. The original image is high-pass filtered, yielding the three large images, each describing local changes in brightness (details) in the original image. It is then low-pass filtered and downscaled, yielding an approximation image; this image is high-pass filtered to produce the three smaller detail images, and low-pass filtered to produce the final approximation image in the upper-left.[clarification needed]

In numerical analysis and functional analysis, a discrete wavelet transform (DWT) is any wavelet transform for which the wavelets are discretely sampled. As with other wavelet transforms, a key advantage it has over Fourier transforms is temporal resolution: it captures both frequency and location information (location in time).

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